CN112186309A - Temperature difference control method of battery pack and battery pack - Google Patents
Temperature difference control method of battery pack and battery pack Download PDFInfo
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- CN112186309A CN112186309A CN202011099141.5A CN202011099141A CN112186309A CN 112186309 A CN112186309 A CN 112186309A CN 202011099141 A CN202011099141 A CN 202011099141A CN 112186309 A CN112186309 A CN 112186309A
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- 238000010438 heat treatment Methods 0.000 claims abstract description 137
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- 230000002349 favourable effect Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000002184 metal Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6554—Rods or plates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6571—Resistive heaters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
本发明属于电池技术领域，公开了一种电池包的温差控制方法及电池包。该电池包的温差控制方法用于改善电池包内电芯模组的温差，具体为：分别采集电芯模组的端板的温度T1和位于电芯模组中间位置的电芯的温度T2，并获得温度T1和温度T2的温差ΔT，将温差ΔT与设定值T进行比较，若温差ΔT大于等于设定值T，则加热端板；若温差ΔT小于设定值T，则停止加热端板。通过加热端板实现了对靠近端板的电芯进行加热，有利于控制电芯在被加热过程的温升，避免直接加热电芯导致电芯局部温度过高的情况提高了电池包的安全性。同时，通过加热或停止加热端板实现了电芯模组内部温度均衡，改善了电池包的内部温差。
The invention belongs to the technical field of batteries, and discloses a temperature difference control method for a battery pack and a battery pack. The temperature difference control method of the battery pack is used to improve the temperature difference of the cell modules in the battery pack, and is specifically: collecting the temperature T1 of the end plate of the cell module and the temperature T2 of the cell located in the middle of the cell module, respectively, And obtain the temperature difference ΔT between temperature T1 and temperature T2, compare the temperature difference ΔT with the set value T, if the temperature difference ΔT is greater than or equal to the set value T, then heat the end plate; if the temperature difference ΔT is less than the set value T, stop the heating end plate. By heating the end plate, the battery cells close to the end plate are heated, which is beneficial to control the temperature rise of the battery cells during the heating process, avoid the situation that the local temperature of the battery cells is too high due to the direct heating of the battery cells, and improve the safety of the battery pack . At the same time, by heating or stopping the heating of the end plate, the internal temperature of the cell module is balanced, and the internal temperature difference of the battery pack is improved.
Description
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a temperature difference control method of a battery pack and the battery pack.
Background
In the use of the battery pack, the temperature of the battery cell at the middle position of the battery cell module is highest, and the battery cell of the battery cell module close to the end plate can dissipate heat quickly through the end plate, so that the temperature is lowest. Especially in the battery package that has the liquid cooling system, because end plate and liquid cooling system direct contact lead to the intermediate position of electric core module and the electric core difference in temperature of tip great, influence the discharge capacity and the life of battery package.
At present, the temperature difference of the battery cell module is improved by installing a heating film between an end plate and the battery cell. The problems of the method are that: the heating film heats the electric core module near the end plate by direct contact, resulting in the temperature rise of the heated electric core being too fast, the local temperature being too high, the heating temperature of the electric core is not easy to be accurately controlled, and certain potential safety hazards exist.
Disclosure of Invention
The invention aims to provide a temperature difference control method for a battery pack, which aims to solve the problems that the temperature difference inside the battery pack is large, and the temperature rise of a battery core is difficult to control due to the fact that the battery core is directly heated.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a temperature difference control method of a battery pack is used for improving the temperature difference of a battery core module in the battery pack, respectively acquiring the temperature T1 of an end plate of the battery core module and the temperature T2 of a battery core positioned in the middle of the battery core module, obtaining the temperature difference delta T between the temperature T1 and the temperature T2, comparing the temperature difference delta T with a set value T,
if the temperature difference delta T is larger than or equal to the set value T, heating the end plate;
and if the temperature difference delta T is smaller than the set value T, stopping heating the end plate.
Preferably, the end plate is internally provided with a heating element, and the heating element can heat or stop heating the end plate.
Preferably, the heating element is a heating film or a positive temperature coefficient thermistor.
Preferably, a change line of the temperature of the end plate along with the heating time is obtained, and different temperature intervals are divided according to the change line; and correspondingly adjusting the heating power of the heating element according to the temperature intervals of the end plates.
Preferably, the temperature interval comprises at least a first interval and a second interval, and the heating power comprises at least a first heating power and a second heating power; when the temperature T1 is in the first interval, the heating element heats the end plate at the first heating power; when the temperature T1 is in the second interval, the heating element heats the end plate at the second heating power.
Preferably, the temperature T1 is an average value of the temperatures of the two end plates respectively located at the two ends of the cell module, and the temperature T2 is an average value of the temperatures of at least three cells located at the middle position of the cell module.
Preferably, the battery pack comprises a collection unit, and the collection unit is installed on the battery cell module.
Preferably, the collection unit includes an FPC board and a plurality of collection terminals disposed on the FPC board, the collection terminals are connected or abutted to the corresponding battery cells or the end plates, and the FPC board collects the temperature T1 and the temperature T2 through the collection terminals.
Preferably, the set value T is 3 ℃.
Another objective of the present invention is to provide a battery pack to solve the problems of large temperature difference inside the battery pack and difficulty in controlling temperature rise of the battery core due to direct heating of the battery core.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a battery pack uses the temperature difference control method of the battery pack.
The invention has the beneficial effects that:
according to the temperature difference control method of the battery pack, the temperature T1 of the end plate and the temperature T2 of the battery cell in the middle of the battery cell module are collected, and the temperature difference delta T between the two is obtained. When the temperature difference delta T is larger than or equal to a set value T, heating the end plate; and if the temperature difference delta T is smaller than the set value T, stopping heating the end plate. The heating of the electric core close to the end plate is realized through the heating end plate, the temperature rise of the electric core in the heating process is favorably controlled, the conditions that the electric core is heated too fast and the local temperature is too high due to the fact that the electric core is directly heated are avoided, potential safety hazards are eliminated, and the safety of the battery pack is improved. Simultaneously, through heating or stopping heating the end plate and having realized that the inside temperature of electric core module is balanced, improved the inside difference in temperature of battery package, reduced the capacity decay of battery package, prolonged the life of battery package.
The battery pack provided by the invention adopts the temperature difference control method of the battery pack, realizes heating of the battery core close to the end plate by heating the end plate, is favorable for controlling the temperature rise of the battery core in the heating process, avoids the conditions of too fast temperature rise and too high local temperature of the battery core caused by directly heating the battery core, eliminates potential safety hazards, and improves the safety of the battery pack. Simultaneously, through heating or stopping heating the end plate and having realized that the inside temperature of electric core module is balanced, improved the inside difference in temperature of battery package, reduced the capacity decay of battery package, prolonged the life of battery package.
Drawings
Fig. 1 is a schematic flow chart of a temperature difference control method for a battery pack according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a battery cell module according to an embodiment of the present invention;
fig. 3 is an end view of a cell module according to an embodiment of the present invention.
The component names and designations in the drawings are as follows:
10. a battery cell module; 1. an electric core; 2. an end plate; 21. mounting grooves; 3. a heating member; 4. an FPC board; 41. and a collecting terminal.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1, the present embodiment discloses a temperature difference control method for a battery pack, which is used to improve the temperature difference of a battery cell module 10 in the battery pack. The temperature difference control method of the battery pack comprises the following specific steps: respectively collecting the temperature T1 of an end plate 2 of the cell module 10 and the temperature T2 of a cell 1 located in the middle of the cell module 10, obtaining the temperature difference delta T between the temperature T1 and the temperature T2, comparing the temperature difference delta T with a set value T, and heating the end plate 2 if the temperature difference delta T is greater than or equal to the set value T; if the temperature difference Δ T is smaller than the set value T, the heating of the end plate 2 is stopped.
According to the temperature difference control method of the battery pack, the battery core 1 close to the end plate 2 is heated by heating the end plate 2, so that the temperature rise of the battery core 1 in the heating process is controlled, the conditions that the temperature rise of the battery core 1 is too fast and the local temperature is too high due to the fact that the battery core 1 is directly heated are avoided, potential safety hazards are eliminated, and the safety of the battery pack is improved. Simultaneously, through heating or stopping heating end plate 2 and having realized that the inside temperature of electric core module 10 is balanced, improved the inside difference in temperature of battery package, reduced the capacity decay of battery package, prolonged the life of battery package.
As shown in fig. 2 and 3, the cell module 10 includes an end plate 2 and a plurality of cells 1. A plurality of electric cores 1 set up side by side to all install end plate 2 at electric core 1 arrangement direction's both ends. It should be noted that the temperature difference of the cell module 10 is the difference between the temperatures of the highest temperature region and the lowest temperature region in the cell module 10. At the electric core module 10 in-process that discharges, the electric core 1 temperature that is in the middle position of electric core module 10 is the highest, and the temperature that is close to electric core 1 of end plate 2 is the lowest. Since the temperature of the battery cell 1 near the end plate 2 is substantially the same as the temperature of the end plate 2 in contact with the battery cell, the measured temperature T1 of the end plate 2 may be used as the temperature of the battery cells 1 at both ends of the cell module.
It should be noted that, before the battery pack is charged, the end plate 2 can be preheated by the temperature difference control method of the battery pack, so that the temperature of the battery pack is increased, the battery pack can be charged quickly, the charging efficiency of the battery pack is increased, and the energy consumption of the battery pack in the charging process is reduced.
Preferably, the end plate 2 is internally provided with a heating member 3, and the heating member 3 can heat or stop heating the end plate 2.
As shown in fig. 2, the end plate 2 is provided with a mounting groove 21, and a heating member 3 capable of heating the end plate 2 is mounted in the mounting groove 21. Specifically, mounting groove 21 is located end plate 2 and extends along end plate 2's direction of height, and runs through end plate 2 direction of height's both ends for mounting groove 21 has two open ends, is convenient for add the installation or the change of heat-insulating material 3, thereby improves the production efficiency of electric core module 10. The mounting groove 21 is a rectangular groove, which is convenient for processing. The opening size of the mounting groove 21 is larger than the size of the heating member 3, facilitating the mounting of the heating member 3.
Because the heating member 3 is located inside the end plate 2, the end plate 2 can play a role in protecting the heating member 3, and meanwhile, the electric core module 10 is compact in structure and high in stability. Moreover, the internal space occupied by the cell module 10 is avoided, and the energy density of the cell module 10 is improved.
Preferably, the end plate 2 has at least two mounting grooves 21, and the at least two mounting grooves 21 are arranged at intervals along the width direction of the battery core 1. The number of the heating parts 3 is the same as that of the mounting grooves 21, and the heating parts are mounted in one-to-one correspondence. The end plate 2 of this embodiment has two mounting grooves 21, and the part between two mounting grooves 21 is the additional strengthening of end plate 2 intermediate position department, has improved end plate 2's intensity, is favorable to strengthening electric core module 10's structural stability. Of course, the number of the mounting grooves 21 may also be three, four or more than five.
Preferably, heating member 3 bonds in the lateral wall that mounting groove 21 is close to electric core 1 group for heating member 3 can heat electric core 1 that is close to end plate 2 fast, is favorable to improving heating rate. Simultaneously, heating member 3 is fixed through bonding, has realized heating member 3's simple and convenient dismouting, has improved the production efficiency of electric core module 10.
The heating member 3 of the present embodiment is a heating film or a positive temperature coefficient thermistor. It can be understood that the heating film or the ptc thermistor is connected to the heating circuit of the cell module 10, and the heating circuit realizes a heating function through the heating film or the ptc thermistor. As the heating principle of the heating film or the positive temperature coefficient thermistor is a conventional technical means in the technical field of batteries, and the heating film or the positive temperature coefficient thermistor is a purchased part, the heating principle of the heating element 3 is not repeated. Of course, the heating member 3 may be other members having a heating function.
Continuing as shown in fig. 2 and 3, the battery pack includes a collection unit, and the collection unit is installed in the battery cell module 10. The temperature difference control method of the battery pack collects the temperature T1 of the end plate 2 in the battery cell module 10 and the temperature T2 of the battery cell 1 located in the middle of the battery cell module 10 through the collecting unit.
The collecting unit of this embodiment includes FPC board 4 and a plurality of collecting terminal 41 that set up in FPC board 4, and collecting terminal 41 connects or butts in electric core 1 or end plate 2 that correspond, and FPC board 4 passes through collecting terminal 41 and gathers temperature T1 and temperature T2.
The collecting terminals 41 of the present embodiment are disposed at intervals on the FPC board 4 along the arrangement direction of the battery cells 1. The number of the collecting terminals 41 in this embodiment is plural, and the plurality of collecting terminals 41 are respectively connected to or abutted against the corresponding electric core 1 or the corresponding end plate 2, so that the FPC board 4 can collect the temperature of each electric core 1 and the temperatures of the two end plates 2 in real time, thereby obtaining the temperatures T1 and T2.
In order to ensure the accuracy of the collected data, preferably, the temperature T1 is an average value of the temperatures of the two end plates 2 respectively located at the two ends of the cell module 10, and the temperature T2 is an average value of the temperatures of at least three cells 1 located at the middle position of the cell module 10. When the number of the battery cells 1 in the battery cell module 10 is large, the number of the battery cells 1 in the middle position can be increased, and the accuracy of data acquisition is further improved. For example, the temperatures of five battery cells 1 located in the middle of the battery cell module 10 are collected, and the average value of the temperatures of the five battery cells 1 is taken as the temperature T2.
The acquisition terminal 41 of the present embodiment is a positive temperature coefficient thermistor or a temperature sensor. As the positive temperature coefficient thermistor or the temperature sensor are mature products, the working principle of temperature acquisition is not repeated. Of course, the collecting terminal 41 may be other components having a temperature collecting function.
The end plate 2 is a metal plate. Therefore, the collecting terminal 41 needs to be fixed on the end plate 2 in an insulated manner for temperature collection. Specifically, the collecting terminal 41 may be fixed to the end plate 2 by spraying insulating paint on the collecting position of the end plate 2 or by thermally conductive adhesive.
Preferably, a change line of the temperature of the end plate 2 with heating time is obtained, and different temperature sections are divided according to the change line. The heating power of the heating element 3 is adjusted correspondingly according to different temperature intervals of the end plate 2. In the process of heating the end plate 2, the heating time of the end plate 2 is taken as an X coordinate, the real-time temperature of the end plate 2 is taken as a Y coordinate, and a change line of the temperature of the end plate 2 along with the heating time is drawn. The temperature of the end plate 2 becomes higher as the heating time increases. Correspondingly, the heating power of the heating member 3 needs to be gradually reduced so as to control the temperature rise of the end plate 2, avoid overheating, and facilitate the accurate control of the temperature rise of the battery cell 10 close to the end plate 2.
Specifically, the temperature change range of the end plate 2 may be divided into a plurality of consecutive temperature sections in the order of temperature from low to high. When the temperature T1 of the end plate 2 is in a lower temperature range, the heating power of the heating element 3 is increased so as to rapidly raise the temperature of the end plate 2; when the temperature T1 of the end plate 2 is in a higher temperature range, the heating power of the heating member 3 is adjusted to be low to avoid the temperature rise of the end plate 2 being too high.
It should be noted that the temperature value from the head end to the tail end in each temperature interval gradually increases, and in any two adjacent temperature intervals, the temperature value at the tail end of one temperature interval is the same as the temperature value at the head end of the other temperature interval.
Preferably, the temperature interval includes at least a first interval and a second interval, and the heating power includes at least a first heating power and a second heating power. When the temperature T1 is in the first interval, the heating member 3 heats the end plate 2 at the first heating power; when the temperature T1 is in the second interval, the heating member 3 heats the end plate 2 at the second heating power. Be located different temperature intervals according to temperature T1, adjust the heating power of heating member 3 in real time to realize the rapid heating of end plate 2, and avoid the temperature rise of end plate 2 too fast, thereby avoid being too fast by the electric core 1 temperature rise of end plate 2 heating.
The temperature interval is divided into two temperature intervals, namely a first interval and a second interval which are connected, the temperature value of the tail end of the first interval is the same as the temperature value of the head end of the second interval, and the first heating power is larger than the second heating power. Of course, the temperature interval can also be divided into three, four or more than five, and the heating power of the heating element 3 is adjusted accordingly. For example, different gears can be set on the heating element 3, and the different gears correspond to different heating powers, so that the adjustment of the heating powers can be quickly realized.
Preferably, the setpoint T is 3 ℃. The set point for this example was 3 ℃. That is, when the temperature difference Δ T between the collection temperature T1 and the temperature T2 is greater than or equal to 3 ℃, the heating element 3 heats the end plate 2, so that the temperature of the battery cell 1 near the end plate 2 is increased until the temperature difference Δ T is less than 3 ℃, and the heating element 3 stops heating.
It should be noted that, in general, when the temperature difference Δ T of the cell module 10 is less than 3 ℃, it is beneficial to improve the electrical performance and the service life of the cell module 10. In other embodiments, the set value T may also be 3.5 ℃ or 4 ℃ or 4.5 ℃ or 5 ℃ or the like.
It should be noted that the battery pack further includes a battery management system (not shown), and the battery management system is respectively connected in communication with the acquisition unit and the heating element 3. The battery management system can control heating member 3 to heat or stop heating end plate 2 according to the electric core 1 and the end plate 2's the difference in temperature of the 10 intermediate positions of electric core module that the acquisition unit gathered. The battery management system is a conventional technical means in the technical field of batteries, and specific working principles of the battery management system are not described in detail.
The present embodiment also discloses a battery pack (not shown). The battery pack adopts the temperature difference control method of the battery pack to eliminate the temperature difference inside the battery pack. Realized heating the electric core 1 that is close to end plate 2 through heating end plate 2, be favorable to controlling the temperature rise of electric core 1 in the heating process, avoid direct heating electric core 1 to lead to the condition that electric core 1 temperature rise is too fast, local high temperature, eliminated the potential safety hazard, improved the security of battery package. Simultaneously, through heating or stopping heating end plate 2 and having realized that the inside temperature of electric core module 10 is balanced, improved the inside difference in temperature of battery package, reduced the capacity decay of battery package, prolonged the life of battery package.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A temperature difference control method of a battery pack is used for improving the temperature difference of a battery core module (10) in the battery pack and is characterized in that the temperature T1 of an end plate (2) of the battery core module (10) and the temperature T2 of a battery core (1) positioned in the middle of the battery core module (10) are respectively collected, the temperature difference delta T of the temperature T1 and the temperature T2 is obtained, the temperature difference delta T is compared with a set value T,
if the temperature difference delta T is larger than or equal to the set value T, heating the end plate (2);
and if the temperature difference delta T is smaller than the set value T, stopping heating the end plate (2).
2. The temperature difference control method of a battery pack according to claim 1, wherein a heating member (3) is installed inside the end plate (2), and the heating member (3) can heat or stop heating the end plate (2).
3. The temperature difference control method of a battery pack according to claim 2, wherein the heating member (3) is a heating film or a positive temperature coefficient thermistor.
4. The temperature difference control method of a battery pack according to claim 2, wherein a change line of the temperature of the end plate (2) with heating time is obtained, and different temperature sections are divided according to the change line; correspondingly adjusting the heating power of the heating element (3) according to the different temperature intervals of the end plate (2).
5. The temperature difference control method for a battery pack according to claim 4, wherein the temperature intervals include at least a first interval and a second interval, and the heating power includes at least a first heating power and a second heating power; when the temperature T1 is in the first interval, the heating element (3) heats the end plate (2) at the first heating power; when the temperature T1 is in the second interval, the heating element (3) heats the end plate (2) at the second heating power.
6. The temperature difference control method of the battery pack according to claim 1, wherein the temperature T1 is an average value of temperatures of two end plates (2) respectively located at two ends of the cell module (10), and the temperature T2 is an average value of temperatures of at least three cells (1) located at a middle position of the cell module (10).
7. The temperature difference control method of the battery pack according to claim 1, wherein the battery pack comprises a collection unit, and the collection unit is mounted on the cell module (10).
8. The temperature difference control method of the battery pack according to claim 7, wherein the collecting unit comprises an FPC board (4) and a plurality of collecting terminals (41) arranged on the FPC board (4), the collecting terminals (41) are connected or abutted to the corresponding battery cells (1) or the end plates (2), and the FPC board (4) collects the temperature T1 and the temperature T2 through the collecting terminals (41).
9. The temperature difference control method for a battery pack according to claim 1, wherein the set value T is 3 ℃.
10. A battery pack characterized by using the temperature difference control method of the battery pack according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011099141.5A CN112186309B (en) | 2020-10-14 | 2020-10-14 | Temperature difference control method of battery pack and battery pack |
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| CN114368321A (en) * | 2021-01-13 | 2022-04-19 | 骆驼集团武汉新能源科技有限公司 | Balance control method for starting and stopping battery system |
| CN114566739A (en) * | 2022-02-28 | 2022-05-31 | 宁德新能源科技有限公司 | Battery heating method and electronic device |
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