Principle of negative pressure formation and heating of a square battery

Introduction The negative pressure of the square battery is converted into a vacuum negative pressure based on the heating principle. According to a search in the personal library, the principle of negative pressure formation heating of square batteries is mainly to u

Principle of negative pressure formation and heating of a square battery

Evacuate the negative pressure. According to the personal research library, the principle of negative pressure formation heating of square batteries is mainly to use an air pump or hydraulic pump to suction the inside of the battery, thereby adjusting the internal air pressure of the battery. lithium battery, thus lowering the temperature. of the lithium battery, and reducing internal oxidation and reducing the reaction of the battery, thereby improving the safety of the battery.

Should the battery be kept warm in winter? Let's take a look at battery technology that can "self-heat".

Lithium batteries have a constant temperature in cold weather and a heating plate can be installed. According to the request for relevant information, if it is an existing battery, it is recommended to add a heating plate, although it will consume more energy, given that in dIn low temperature conditions, if there is no heating plate, it will release less. only 20% of the power, and when there is a heating plate, 50% of the electricity can be discharged.

Does the lithium battery have an impact on range in winter?

Is impulse self-heating really stable enough?

In fact, this is not the case. Although the whole design of this "pulse self-heating" technology has the potential of "black technology", in fact, this technology still needs running-in, debugging and optimization. Additionally, Changan Technology is not the first manufacturer in the market to use pulse self-heating technology for battery thermal management. BYD, which is both a battery supplier and an automobile brand, has actually applied this technology to its models.

This technology is mainly used ins BYD's DM-i super hybrid model. BYD's hybrid specific blade battery uses a pulse self-heating thermal management system. However, BYD's technology is somewhat different from the solution used by Changan Deep Blue. Changan Deep Blue uses alternating current to heat the ternary lithium batteries, while BYD's solution uses two sets of lithium iron phosphate blade batteries to discharge each other (DC). for heating.

In principle, in fact, Changan and BYD use a solution that uses a method in which current passes through a large resistance to generate heat after the temperature drops and the internal resistance increases. However, Changan generates an alternation. current outside the battery for overcharging, while BYD uses two batteries to supply DC power to each other to "heat" each other. This is similare to the CATL solution.

BYD's current model using this technology is Qin PLUS. The current Qin PLUS DM-i will be launched in March 2021. After the launch, DM-i also appeared online. There are some issues in actual use. Among them, the most common answer from car owners is that Qin PLUS DM-i will experience engine shaking and misfire in low temperature environments.

This situation is linked to the pulsed self-heating technology used in the blade battery. The manufacturer's temperature setting for the self-heating function is too extreme, causing the pulse self-heating function cannot start normally at non-extremely low temperatures, and the DM-i engine requires a battery to run it. The motor gives the motor an initial speed so that the motor can avoid shaking when starting.

Therefore, theThe situation encountered by Qin PLUS DM-i owners above is caused by the failure of the pulse self-heating function which does not work properly at non-extremely low temperatures. At the same time, since the pulse self-heating function requires two batteries to charge and heat each other through a voltage boost schedule, when using the pulse self-heating function pulse, the battery cannot produce a full and continuous operating voltage, and therefore cannot normally provide stable power for the electric drive, which also shows that the DM-i model can only choose between the Pulsed self-heating and electric drive.

After seeing the problems caused by BYD technology, we as consumers should still be cautious about Changan's technology. Changan must resolve otherproblems as electric propulsion/self-heating. In addition to choosing one of the two, additional efforts are required for the identification of the ambient temperature and the calibration of the start of self-heating. We also look forward to Changan providing the actual measured data of “microcore high-frequency pulse self-heating” technology.

Summary:

In an era where traditional brands and new power brands clash, the arms race is not only about In terms of mechanical adjustment, but also in terms of high-precision technology, this is a key link, so it is not difficult to understand why Changan has worked tirelessly to launch a new electric platform. Judging from the pulse self-heating technology announced this time, technical improvements are worth looking forward tos, but technology ultimately depends on experience. In addition, the last car manufacturer using pulse self-heating technology suffered heavy losses in low temperature areas. , this time Changan launches another model with this technology, and we hope Changan can give our consumers a satisfactory answer in terms of fit and actual testing experience. (Text: Gao Zijian)

Expand the rest of the text (1/2) 2 Back to top Is impulse self-heating really stable enough?

In fact, this is not the case. Although the whole design of this "pulse self-heating" technology has the potential of "black technology", in fact, this technology still needs running-in, debugging and optimization. In addition, Changan Technology is not the first manufacturer in the market to use pulse self-heating technology for heat management.battery power. BYD, which is both a battery supplier and an automobile brand, has actually applied this technology to its models.

This technology is mainly used in BYD's DM-i super hybrid model. BYD's hybrid specific blade battery uses a pulse self-heating thermal management system. However, BYD's technology is somewhat different from the solution used by Changan Deep Blue. Changan Deep Blue uses alternating current to heat the ternary lithium batteries, while BYD's solution uses two sets of lithium iron phosphate blade batteries to discharge each other (DC). for heating.

In principle, in fact, both Changan and BYD use a solution in which current passes through a large resistance to generate heat after the temperature drops and the internal resistance increases. However, Changan generates a calternating current outside the battery for overcharging, while BYD uses two batteries. packs to provide direct current to each other. “Heating” is similar to CATL’s solution.

BYD's current model using this technology is Qin PLUS. The current Qin PLUS DM-i will be launched in March 2021. After the launch, DM-i also appeared online. There are some issues in actual use. Among them, the most common answer from car owners is that Qin PLUS DM-i will experience engine shaking and misfire in low temperature environments.

This situation is linked to the pulsed self-heating technology used in the blade battery. The manufacturer sets the temperature setting for the self-heating function too extreme, which prevents the pulse self-heating function from starting normally at non-extremely low temperatures. EngineDM-i requires a battery to drive the motor. The motor has an initial speed so that the motor can avoid start-up time jitter.

Therefore, the situation encountered by Qin PLUS DM-i owners above is caused by the failure of the pulse self-heating function which does not work properly at temperatures not extremely low. At the same time, since the pulse self-heating function requires two batteries to charge and heat each other through a voltage boost schedule, when using the pulse self-heating function pulse, the battery cannot produce a full and continuous operating voltage, and therefore cannot normally provide stable power for the electric drive, which also shows that the DM-i model can only choose between the Pulsed self-heating and electric drive.

After havingConsidering the problems caused by BYD technology, we as consumers should always be cautious about Changan's technology. Changan needs to solve other problems besides electric propulsion/self-heating. In addition to choosing one of the two, additional efforts are required for the identification of the ambient temperature and the calibration of the start of self-heating. We also look forward to Changan providing the actual measured data of “microcore high-frequency pulse self-heating” technology.

Summary:

In an era where traditional brands and new power brands clash, the arms race is not only about level of mechanical adjustment, but also at the level of high precision technology, this is a key link, so it is not difficult to understand why Changan has worked tirelessly for thelaunch a new electrical platform. Judging from the pulse self-heating technology announced this time, technical improvements are worth looking forward to, but technology ultimately depends on experience. In addition, the last car manufacturer using pulse self-heating technology suffered heavy losses in low temperature areas. , this time Changan launches another model with this technology, and we hope Changan can give our consumers a satisfactory answer in terms of fit and actual testing experience. (Text: Gao Zijian)

@2019

Lithium batteries impact cruising range in cold winter.

The working principle of a lithium-ion battery is that the internal electrolyte changes through chemical reactions, causing a potential difference between the positive and negative electrodes to generate current. In an environment withlow temperature, the electrolyte moves very slowly, which affects the transfer activity of lithium ions between the positive and negative electrodes, resulting in a decrease in the charging and discharging performance of the battery.

To put it simply, in a low temperature environment, it is not that the lithium battery is really discharged, but that it is powered but cannot be released normally. According to analytical data, the capacity of ordinary lithium batteries will be reduced by 20% at zero degrees Celsius, and when it reaches minus 10 degrees Celsius, the capacity may only be about half.

Detailed information:

Precautions for winter use:

1. Find a warm place to charge

When charging an electric vehicle when the ambient temperature is below 0℃, the system automatically heats the cellsfrom the battery first when the battery cell temperature exceeds 5℃. , only then will you actually start charging the vehicle. Some electric vehicle owners may feel that the charging speed of electric vehicles suddenly slows down in winter. This actually means that there is additional time to heat the battery cells before recharging the vehicle.

Therefore, when car owners usually charge their cars, they should try to do so in underground parking lots, closed garages and other places. This will help improve battery activity, not only reducing loss of cruising range, but also improving charging efficiency and saving time.

2. Charge for a short time before traveling

The electric car still had 60% or 70% of its power on Fridayille, but when I started the car the next morning, I discovered that only 60 or 70% of the power remained, or even less. Some call this situation a “power outage.” In fact, this “power outage” is not a fault, but is caused by low temperature. When an electric vehicle is driving, the battery is in a continuous discharge state, the temperature will be relatively high, and the battery voltage will also be relatively high. The remaining power of the electric vehicle displayed at this time is a normal value.

However, after being parked at low temperatures overnight, the battery cooled and the voltage dropped. At that time, the car's system will automatically adjust the displayed power and cruising range, which creates a ". The illusion of "running out of power". In this case, you usually just need to get out in advance and charge the battery for approximately 10 minutes

3. Drive steadily and not in a hurry

When driving an electric vehicle, you should start slowly and avoid violent driving such as sudden deceleration, sharp turns and sudden braking. Good driving habits can effectively reduce the speed of battery consumption. The time between starting the car should not exceed 5 seconds, and the interval between restarts should not be less than 15 seconds.

If the battery mileage decreases too much, go to the 4S store to check the car battery in time, replenish the battery electrolyte in time, and adjust the electrolyte proportion.

People's Daily Online - Mobile phone automatically turns off when frozen? Lithium battery products undergo extreme cold test

People's Daily Online - Electric vehicles in winterBattery rangeie is reduced? How to "survive the winter"

  • Popular Focus
  • Where is the cheapest battery wholesale?

    Where is the cheapest battery wholesale in Tangxia, Sanyuanli, Baiyun District? There is an enterprise specializing in the independent production of electric vehicles in Tangxia, Sanyuanli, Baiyun District, Baiyun Sanyuanli Avenue, Baiyun Sanyuanli Street
    08-02
  • Four 3.7V lithium batteries in series and parallel produce 7.4V/4.4A. How to reduce it to 4.8V/4.4A?

    Four 3.7V lithium batteries in series and parallel produce 7.4V/4.4A. I personally think it is impossible to reduce it to 4.8V/4.4A. Because the discharge platform of lithium batteries is generally set
    08-10
  • What are the materials of the negative electrodes of lithium batteries?

    What are the materials of the negative electrodes of lithium batteries? The main commercial applications of lithium batteries include graphite, which is a sheet of copper used to guide current and which does not react. another safe
    08-02
  • The difference between 18500 and 26500 batteries

    What is the difference between 18500 and 26500 batteries? The answer above is 18650. The person asking the question should ask what is the difference between 18505 and 26500 batteries. In the case of Fuant ER1
    08-02
  • What does 3.7V 80mAh written on a lithium battery mean?

    What does 3.7V 80mAh written on a lithium battery mean? 3.7 V, 80 mA = 0.08 A, H means 1 hour, or 3600 seconds. Taken together, it is
    08-02
  • How long does a lithium battery (cell phone battery) last?

    How long does a lithium battery (cell phone battery) last? The lifespan of mobile phone batteries, under normal conditions of use and without serious impact, the lifespan set by the manufacturer must be 5 years.
    08-02
  • Will lithium batteries explode when charging?

    Will lithium batteries explode when charged? Will lithium batteries explode when charged? Lithium battery explosions usually occur during the charging process, because the negative electrode material of lithium batteries is graphite or other carbon materi
    08-02
  • Parameters of lgdas31865 lithium battery

    Parameters of lgdas31865 lithium battery The parameters of lgdas31865 lithium battery are as follows: LGDAS31865 is a model 18650 lithium battery with a capacity of
    08-02
  • What are the main components of lithium battery electrolyte?

    What are the main components of lithium battery electrolyte? The composition of lithium battery electrolyte is shown below. 1. Ethylene carbonate: molecular formula C3H4O3. Colorless transparent liquid (>35℃), room temperature
    08-02
  • Who are the lithium battery manufacturers in Shandong?

    What are the lithium battery manufacturers in Shandong? Shandong Shengyang Power Supply Co., Ltd. and Shandong Weineng Environmental Protection Power Technology Co., Ltd. 1. Shandong Shengyang Power Supply Co., Ltd. is located in Shengyang, Qufu City.
    08-02
  • Types of drone batteries available in 2024

    Part 1. Types of drone batteries available in 2024In 2024, drone batteries have advanced significantly, offering a range of options to cater to various needs in
    07-30
  • How long does it take to charge 26650 battery?

    How long does it take to charge a 26650 battery? The charging time for a 26650 battery is generally between 3 and 6 hours, but the precise time depends on the power of the charger and the capacity of the battery. in general
    08-02
  • For what?Sure, here's an article based on the phrase "For what?

    The simple yet profound question, "For what?" often serves as a gateway to deeper reflections on purpose and intention. It is a query that invites us to delve into the reasons behind actions, decisions, and circumstances that shape our lives and the wor
    08-02
  • Choosing the Right Cart Battery

    This comprehensive guide will walk you through everything you need about cart batteries, from understanding different types to making an informed purchase decision.
    08-02
  • 30mAh~500mAh 3.7 V Li-ion Battery

    Welcome to Ufine's collection of 3.7V lithium-ion batteries ranging from 30mAh to 500mAh. Explore a diverse range of compact and lightweight batteries suitable for various electronic devices,
    08-02
  • Here are 10 essential facts about drone batteries for 2024.

    10 Key Facts About Drone Battery for 2024 In 2024, drone batteries have advanced significantly, offering a range of options to cater to various needs in the consumer, commercial, and industrial sectors. Below are the primary types of drone batteries avai
    08-02
  • Could you please explain the difference among IMR, ICR, INR, and IFR 18650 batteries?

    What is the Difference Between IMR, ICR, INR, and IFR 18650 Battery?In 18650 batteries, discerning the differences among IMR, ICR, INR, and IFR types is fundamental for tailored and efficient battery usage. These distinct
    08-02
  • Safety considerations for cart batteries

    Selecting the ideal cart battery is crucial for ensuring optimal performance and longevity of your electric vehicle or vaping device. This comprehensive guide w
    08-01