A power battery pack thermal management chip and system

Abstract

The present invention relates to the technical field of power battery packs, and in particular to a power battery pack thermal management chip and system, comprising an FPC, a main control chip, a temperature measurement module, and m battery control modules, all of which are arranged on the FPC. The temperature measurement module, the heat dissipation module, the heating module, and the m battery control modules are all connected to the main control chip by signal. The temperature measurement module includes an ambient temperature detector and m temperature sensors. The ambient temperature detector is used to obtain the ambient temperature of the space where the power battery pack is located, and the temperature sensor is used to sense the temperature of a single battery module. The main control chip is used to control the power supply of a corresponding number and position of battery modules according to the ambient temperature, the temperature of each battery module, and the required power. The present invention combines the ambient temperature of the power battery pack, the actual temperature of each battery module, and the required power to control the power supply of a corresponding number of battery modules, thereby keeping the working efficiency of the battery modules as optimal as possible at the current temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery packs, and in particular to a power battery pack thermal management chip and system. Background Art

[0002] The power battery packs currently used in new energy vehicles are usually ternary lithium batteries or lithium iron phosphate batteries. These power battery packs have an optimal operating temperature range during actual use. When the ambient temperature is lower than the optimal operating temperature range, the battery activity will decrease; when the ambient temperature is higher than the optimal operating temperature range, the battery will overheat and reduce its lifespan or even burn out in severe cases.

[0003] Therefore, in power battery packs, thermal management chips are usually used to control them. The thermal management chip is coordinated with the heating module and the heat dissipation module to ensure that the temperature of the power battery pack is as close to the optimal operating temperature range as possible during operation.

[0004] Existing thermal management solutions are usually implemented by controlling the heating module and the heat dissipation module based on a combination of multiple parameters. They do not take into account the output power and heat generation of a single battery, resulting in the heat generated by the power battery pack not being able to better match the current temperature. Summary of the Invention

[0005] In order to solve the problems in the prior art, the present invention provides a power battery pack thermal management chip and system, which integrates the heat generated by the power supply of the power battery pack itself into the thermal management, so that the output power of the power battery pack is more in line with the current temperature.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a power battery pack thermal management chip, comprising an FPC, a main control chip, a temperature measurement module, a heat dissipation module, a heating module, and m battery control modules, all of which are arranged on the FPC. The temperature measurement module, the heat dissipation module, the heating module, and the m battery control modules are all connected to the main control chip by signal. The m battery control modules are connected one-to-one with the m battery modules in the external power battery pack.

[0008] The temperature measurement module includes an ambient temperature detector and m temperature sensors. The ambient temperature detector is used to obtain the ambient temperature of the space where the power battery pack is located. The m temperature sensors are set in a one-to-one correspondence with the m battery modules. The temperature sensors are used to sense the temperature of a single battery module.

[0009] The heat dissipation module is used for external radiator;

[0010] The heating module is used to heat the battery module;

[0011] The main control chip is used to control the corresponding number and position of battery modules to supply power according to the ambient temperature, the temperature of each battery module and the required power;

[0012] Here, m is a natural number greater than 2.

[0013] Furthermore, the operations of the main control chip specifically include:

[0014] S1. Obtain the ambient temperature and the temperature of each battery module, and then calculate the average temperature difference between the ambient temperature and the temperature of each battery module;

[0015] S2. If the average temperature difference is within the first range, n adjacent battery modules are controlled to supply power according to the power required by external electrical appliances;

[0016] S3. If the average temperature difference is in the second range, n non-adjacent battery modules are controlled to supply power according to the power required by external electrical appliances;

[0017] The maximum value of the first range is smaller than the minimum value of the second range, and the first range and the second range are two continuous temperature intervals; n is a natural number not less than 1 and n≤m.

[0018] Furthermore, the first range includes a third range and a fourth range that increase in sequence, and step S2 specifically includes:

[0019] S21. Determine whether the average temperature difference is within the third range or the fourth range. If it is within the third range, execute step S22; if it is within the fourth range, execute step S23;

[0020] S22. Control n adjacent battery modules to supply power to the first battery pack. The total power provided by the first battery pack is greater than the power required by the external electrical appliances. The main control chip uses the total power to power the heating module and the external electrical appliances at the same time, and uses the heating module to heat the power battery pack.

[0021] S23. Control n adjacent battery modules to form a first battery group for power supply.

[0022] Furthermore, in step S2, the battery module selected for each power supply includes:

[0023] According to the number n of required battery modules, the remaining total power and temperature of n adjacent battery modules are calculated respectively; the remaining total power values ​​and average temperatures of m-n+1 first battery modules are obtained;

[0024] Select the first battery group with the highest average temperature to supply power; if there is more than one first battery group with the highest average temperature, select the first battery group with the highest remaining power value among the first battery groups with the highest average temperature to supply power;

[0025] Among them, the average temperature value is accurate to the single digit or the first decimal place.

[0026] Furthermore, the second range includes the fifth range and the sixth range, and step S3 specifically includes:

[0027] S31. Determine whether the average temperature difference is in the fifth range or the sixth range. If it is in the fifth range, execute step S32; if it is in the sixth range, execute step S33;

[0028] S32. Control n non-adjacent battery modules to supply power;

[0029] S33. Control n non-adjacent battery modules to provide power. The total power provided by the n adjacent battery modules is greater than the power required by external electrical appliances. The main control chip uses the total power to power the heat dissipation module and external electrical appliances at the same time, and uses the heat dissipation module to dissipate heat from the power battery pack.

[0030] Furthermore, in step S3, the battery module selected for each power supply includes:

[0031] A. Compare the values ​​of n and m and obtain the value of m. If m is odd, execute steps B and D; if m is even, execute steps E and F.

[0032] B. If m>2n+1, select the n battery modules with the largest residual current, and then determine whether the battery modules are adjacent. If so, replace the adjacent batteries. Otherwise, use the n battery modules with the largest residual current to supply power.

[0033] C. If m = 2n + 1, select n battery modules that are not connected to each other for power supply;

[0034] D. If m < 2n + 1, the n battery modules with the largest residual current are selected for power supply;

[0035] E. If m ≥ 2n, select the n battery modules with the largest residual current, and then determine whether the battery modules are adjacent. If so, replace the adjacent batteries. Otherwise, use the n battery modules with the largest residual current to supply power.

[0036] F. If m < 2n + 1, then select the n battery modules with the largest residual current to supply power.

[0037] Furthermore, controlling a corresponding number of battery modules to supply power according to the ambient temperature, the temperature of each battery module, and the required power specifically includes:

[0038] Get the power P of the required electrical energy;

[0039] Obtain the temperature of the battery module and calculate the optimal energy supply power P' of the battery module;

[0040] Calculate the ratio value according to k = P / P';

[0041] Get the ambient temperature. If the ambient temperature is lower than the preset value, take the integer part of k as the value of n, and if k is less than 1, n=1;

[0042] If the ambient temperature is not lower than the preset value, the integer part of k is taken as the value of n after adding 1.

[0043] Furthermore, the preset value has a range of 25±5°C.

[0044] Furthermore, the FPC is also provided with a kinetic energy recovery module, which is connected to the main control chip signal. The working mode of the kinetic energy recovery module includes:

[0045] Obtain the temperature and remaining power value of each battery module, and calculate the average remaining power value of all battery modules;

[0046] The battery module with the highest temperature is charged. If the remaining power of the charged battery module is 10% higher than the average remaining power value, the kinetic energy recovery module charges the battery module with the second highest temperature.

[0047] Among them, when there is more than one battery module with the highest temperature, the kinetic energy recovery module charges all battery modules with the highest temperature at the same time.

[0048] The present invention also provides a new energy vehicle power system, comprising a power battery pack and the above-mentioned power battery pack thermal management chip, wherein the power battery pack thermal management chip is electrically connected to the power battery pack.

[0049] Beneficial effects of the present invention: The present invention combines the ambient temperature of the power battery pack, the actual temperature of each battery module and the required electrical energy to control the corresponding number of battery modules for power supply, so that the working efficiency of the battery module can be maintained as optimal as possible at the current temperature, achieving better thermal management effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic diagram of Example 1.

[0051] Figure 2 This is a schematic diagram of Example 2.

[0052] Figure numerals: 1—FPC, 2—main control chip, 3—temperature measurement module, 4—heating module, 5—heating module, 6—battery control module, 7—kinetic energy recovery module, 8—power battery pack, 31—environmental temperature detector, 32—temperature sensor, 81—battery module. DETAILED DESCRIPTION

[0053] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the embodiments and the accompanying drawings. The contents mentioned in the embodiments are not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0054] Example 1

[0055] like Figure 1 As shown, this embodiment provides a power battery pack thermal management chip, including an FPC1, a main control chip 2, a temperature measurement module 3, a heat dissipation module 4, a heating module 5, and m battery control modules 6, all of which are arranged on the FPC1. The temperature measurement module 3, the heat dissipation module 4, the heating module 5, and the m battery control modules 6 are all signal-connected to the main control chip 2, and the m battery control modules 6 are connected one-to-one with the m battery modules 81 in the external power battery pack 8;

[0056] The temperature measurement module 3 includes an ambient temperature detector 31 and m temperature sensors 32. The ambient temperature detector 31 is used to obtain the ambient temperature of the space where the power battery pack 8 is located. The m temperature sensors 32 are set in a one-to-one correspondence with the m battery modules 81. The temperature sensors 32 are used to sense the temperature of a single battery module 81.

[0057] The heat dissipation module 4 is used for connecting to an external heat sink;

[0058] The heating module 5 is used to heat the battery module 81;

[0059] The main control chip 2 is used to control the corresponding number and position of battery modules 81 to supply power according to the ambient temperature, the temperature of each battery module 81 and the required power;

[0060] Here, m is a natural number greater than 2.

[0061] In actual use, the power battery pack 8 usually has multiple battery modules 81, each battery module 81 is electrically controlled by a battery control module 6. The main control chip 2 calculates the energy required according to external instructions, and then combines the current ambient temperature and the temperature of each battery module 81 to control the battery module 81 that meets the requirements to discharge, thereby realizing the provision of electrical energy.

[0062] The compliance requirements described in this embodiment include: after the battery module 81 is discharged to a certain extent, its temperature will increase, and different battery modules 81 will not have different temperatures even if they are discharged at the same time due to reasons such as process and position. Based on this, the present invention gives priority to discharging the battery module 81 with a lower current temperature when the ambient temperature is high, and gives priority to discharging the battery module 81 with a higher current temperature when the ambient temperature is low. That is, each time the battery modules 81 are discharged, it is not necessary for all battery modules 81 to discharge together, but rather a reasonable arrangement of a corresponding number of battery modules 81 to discharge at the optimal power under the current ambient temperature, thereby ensuring that the discharge efficiency and heat generation of the battery module 81 are achieved under the current optimal conditions, which is conducive to thermal management.

[0063] In this embodiment, the operations of the main control chip 2 specifically include:

[0064] S1 obtains the ambient temperature and the temperature of each battery module 81, and then calculates the average temperature difference between the ambient temperature and the temperature of each battery module 81;

[0065] S2. If the average temperature difference is within the first range, n adjacent battery modules 81 are controlled to supply power according to the power required by external electrical appliances;

[0066] S3. If the average temperature difference is in the second range, n non-adjacent battery modules 81 are controlled to supply power according to the power required by external electrical appliances;

[0067] The maximum value of the first range is smaller than the minimum value of the second range, and the first range and the second range are two continuous temperature intervals; n is a natural number not less than 1 and n≤m.

[0068] In actual operation, the first range corresponds to a lower temperature interval, and the second range corresponds to a higher temperature interval. In the first range, it is preferred to allow adjacent battery modules 81 to be powered at the same time, so that the location where heat is generated is more concentrated, ensuring that the temperature around the discharged battery module 81 is significantly and rapidly increased, so that the discharge efficiency of the battery module 81 is optimized as soon as possible; subsequently, after the entire power battery pack 8 is heated and heated in cooperation with the external heating module 5, other battery modules 81 that have reached the optimal discharge efficiency are discharged. Similarly, in the second range, the ambient temperature is higher, and at this time it is more inclined to allow non-adjacent battery modules 81 to be powered, so that the heat generated when the battery module 81 is discharged will not accumulate in a certain area, which is beneficial for the heat dissipation of the heat dissipation module 4, and also ensures that the life of a single battery module 81 will not be reduced due to a rapid temperature increase.

[0069] Specifically, the first range includes a third range and a fourth range that increase in sequence, and step S2 specifically includes:

[0070] S21. Determine whether the average temperature difference is within the third range or the fourth range. If it is within the third range, execute step S22; if it is within the fourth range, execute step S23;

[0071] S22. Control n adjacent battery modules 81 to supply power to the first battery pack. The total power provided by the first battery pack is greater than the power required by the external electrical appliances. The main control chip 2 uses the total power to power the heating module 5 and the external electrical appliances at the same time, and uses the heating module 5 to heat the power battery pack 8.

[0072] S23. Control n adjacent battery modules 81 to form a first battery group for power supply.

[0073] The third range and the fourth range are two continuous temperature intervals. In the third range, it can be understood as below 10°C or other temperatures. At this time, the efficiency of the battery module 81 is very low. Therefore, it is necessary not only to discharge the adjacent battery modules 81 to ensure that the heat is not lost too quickly, but also to use the heating module 5 to keep the power battery pack 8 warm so that the power battery pack 8 can work normally; in the fourth range, it can be understood as 10-25°C. Although the temperature is not high, the heating module 5 is not required for insulation, and the battery module 81 can also work normally. At this time, it is still necessary to control the adjacent battery modules 81 to generate heat, starting with the local temperature increase of the power battery pack 8, allowing the heat to gradually diffuse to other battery modules 81. After heating, other battery modules 81 can also participate in the discharge work, thus cleverly achieving the rational use of heat.

[0074] Preferably, in step S2, the battery module 81 used for power supply each time is selected in the following manner:

[0075] According to the number n of required battery modules 81, the remaining total power and temperature of n adjacent battery modules 81 are calculated respectively; the remaining total power values ​​and average temperatures of m-n+1 first battery groups are obtained;

[0076] Select the first battery group with the highest average temperature to supply power; if there is more than one first battery group with the highest average temperature, select the first battery group with the highest remaining power value among the first battery groups with the highest average temperature to supply power;

[0077] Among them, the average temperature value is accurate to the single digit or the first decimal place.

[0078] For example, if battery modules 81 of 1, 2, 3, and 4 are required, and if n=2, the first battery groups are respectively 1 and 2, 2 and 3, and 3 and 4. In the present invention, if the power battery pack 8 has been working for a period of time, the first battery group is selected to work according to the above-mentioned average temperature as the highest priority. If the power battery pack 8 just starts working, the temperatures of the first battery groups are basically the same. At this time, the first battery group with a high remaining power is preferentially used to supply power, achieving a reasonable discharge effect. Of course, if the average temperature and the remaining power are also the same within the error range, the first battery group located in the middle is preferentially controlled to discharge. For example, in the above example, the first battery group composed of 2 and 3 is controlled to discharge, so that the heat can gradually diffuse outward, thereby improving the heat utilization efficiency.

[0079] Specifically, the second range includes the fifth range and the sixth range, and step S3 specifically includes:

[0080] S31. Determine whether the average temperature difference is in the fifth range or the sixth range. If it is in the fifth range, execute step S32; if it is in the sixth range, execute step S33;

[0081] S32 controls n non-adjacent battery modules 81 to supply power;

[0082] S33. Control n non-adjacent battery modules 81 to provide power. The total power provided by the n adjacent battery modules 81 is greater than the power required by external electrical appliances. The main control chip 2 uses the total power to power the heat dissipation module 4 and external electrical appliances at the same time, and uses the heat dissipation module 4 to dissipate heat from the power battery pack 8.

[0083] Similarly, the fifth range and the sixth range are two continuous temperature intervals. The fifth range can be 25-30 degrees Celsius, while the sixth range is above 30°C. In the fifth range, as long as the battery module 81 is not discharging at high power, the battery module 81 will inevitably operate at a comfortable temperature. Therefore, in order to avoid heat accumulation, the battery modules 81 that work at the same time should work as non-adjacent battery modules 81 as possible to ensure that the heat generation is more dispersed, thereby facilitating timely heat dissipation. Similarly, in the sixth range, it is necessary to cooperate with the heat dissipation module 4 to cool down to ensure that the battery module 81 will not overheat and affect its life or even bring safety hazards.

[0084] Specifically, in step S3, the battery module 81 used for power supply each time is selected in the following manner:

[0085] A. Compare the values ​​of n and m and obtain the value of m. If m is odd, execute steps B and D; if m is even, execute steps E and F.

[0086] B. If m>2n+1, select the n battery modules 81 with the largest residual current, and then determine whether the battery modules 81 are adjacent. If so, replace the adjacent batteries. Otherwise, use the n battery modules 81 with the largest residual current to supply power.

[0087] C. If m=2n+1, n battery modules 81 that are not connected to each other are selected for power supply;

[0088] D. If m < 2n + 1, then the n battery modules 81 with the largest residual current are selected for power supply;

[0089] E. If m ≥ 2n, select the n battery modules 81 with the largest residual current, and then determine whether the battery modules 81 are adjacent to each other. If so, replace the adjacent batteries. Otherwise, use the n battery modules 81 with the largest residual current to supply power.

[0090] F. If m<2n+1, then the n battery modules 81 with the largest residual current are selected for power supply.

[0091] That is, if non-adjacent battery modules 81 need to be operated, the following conditions must be met: if m is an odd number, then m ≥ 2n + 1; if m is an even number, then m ≥ 2n. However, when external electrical appliances have high energy requirements, more battery modules 81 must be involved in the discharge. In this case, it is impossible to keep non-adjacent battery modules 81 discharging. Therefore, as many battery modules 81 as possible must be discharged to prevent the battery modules 81 from heating up too quickly during discharge and to allow for timely heat dissipation.

[0092] In this embodiment, controlling a corresponding number of battery modules 81 to supply power according to the ambient temperature, the temperature of each battery module 81 and the required power specifically includes:

[0093] Get the power P of the required electrical energy;

[0094] Obtain the temperature of the battery module 81 and calculate the optimal energy supply power P' of the battery module 81;

[0095] Calculate the ratio value according to k = P / P';

[0096] Get the ambient temperature. If the ambient temperature is lower than the preset value, take the integer part of k as the value of n, and if k is less than 1, n=1;

[0097] If the ambient temperature is not lower than the preset value, the integer part of k is taken as the value of n after adding 1.

[0098] In actual use, the preset value range is 25±5°C. Taking 25°C as the preset value as an example, when the ambient temperature is lower than 25°C, m=10, and k=2.110 is calculated, the battery module 81 is selected according to n=2. This allows the battery module 81 to release heat at a higher power, allowing the temperature to accumulate and rise quickly. If the ambient temperature is not lower than 25°C, m=10, and k=2.110 is calculated, the value of n=2+1=3 is selected, allowing the battery module 81 to discharge at a lower power. In combination with the non-adjacent selection scheme, heat generation is not too rapid and can be dissipated in time.

[0099] In this embodiment, the FPC 1 is further provided with a kinetic energy recovery module 7, which is signal-connected to the main control chip 2. The working mode of the kinetic energy recovery module 7 includes:

[0100] Obtain the temperature and remaining power value of each battery module 81, and calculate the average remaining power value of all battery modules 81;

[0101] The battery module 81 with the highest temperature is charged. If the remaining power of the charged battery module 81 is 10% higher than the average remaining power value, the kinetic energy recovery module 7 charges the battery module 81 with the second highest temperature.

[0102] When there is more than one battery module 81 with the highest temperature, the kinetic energy recovery module 7 charges all the battery modules 81 with the highest temperature at the same time.

[0103] The kinetic energy recovery module 7 is a standard feature of new energy vehicles. When the ignition is released, it converts the energy from the vehicle's inertial movement into electrical energy to charge the power battery pack 8, thereby increasing the battery life of the power battery pack 8. In this state, the present invention prioritizes charging the hottest battery module 81, as it must have recently discharged. Only when the battery level of the hottest battery module 81 is significantly higher than that of the other battery modules 81 does the charging process switch to the other battery modules 81.

[0104] Allowing the battery module 81 to charge at a suitable temperature also ensures the charging efficiency of the battery module 81, thereby helping to improve the efficiency of kinetic energy recovery.

[0105] Of course, if the temperature of the battery module 81 being charged is too high, in order to avoid affecting the battery life, charging of the battery module 81 is usually stopped until the temperature drops.

[0106] It should be noted that the battery modules 81 of the present invention are in parallel structure, or every two adjacent (preferably up to three) battery modules 81 are connected in series, and equipped with a transformer module to ensure the daily use of electrical appliances and achieve the effects described in the present invention.

[0107] In summary, in the solution disclosed in the present invention, in addition to being equipped with corresponding heating modules 5 and heat dissipation modules 4, power is supplied by controlling different numbers and positions of battery modules 81 according to temperature, so that heat will not be dissipated at low temperatures and accumulated at high temperatures, thereby achieving the effect of thermal management.

[0108] Example 2

[0109] like Figure 2 As shown, this embodiment provides a new energy vehicle power system, including a power battery pack 8 and the above-mentioned power battery pack 8 thermal management chip, wherein the power battery pack 8 thermal management chip is electrically connected to the power battery pack 8. This achieves reliable thermal management of the power battery pack 8, further improving the safety of the power battery pack 8 and the utilization rate of electric energy.

[0110] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are all within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. A power battery pack thermal management chip, characterized in that: It includes an FPC, a main control chip, a temperature measurement module, a heat dissipation module, a heating module, and m battery control modules all arranged on the FPC. The temperature measurement module, the heat dissipation module, the heating module, and the m battery control modules are all connected to the main control chip signal. The m battery control modules are connected one-to-one with the m battery modules in the external power battery pack; The temperature measurement module includes an ambient temperature detector and m temperature sensors. The ambient temperature detector is used to obtain the ambient temperature of the space where the power battery pack is located. The m temperature sensors are set in a one-to-one correspondence with the m battery modules. The temperature sensors are used to sense the temperature of a single battery module. The heat dissipation module is used for external radiator; The heating module is used to heat the battery module; The main control chip is used to control the corresponding number and position of battery modules to supply power according to the ambient temperature, the temperature of each battery module and the required power; Wherein, m is a natural number greater than 2; The operations of the main control chip specifically include: S1. Obtain the ambient temperature and the temperature of each battery module, and then calculate the average temperature difference between the ambient temperature and the temperature of each battery module; S2. If the average temperature difference is within the first range, n adjacent battery modules are controlled to supply power according to the power required by external electrical appliances; S3. If the average temperature difference is in the second range, n non-adjacent battery modules are controlled to supply power according to the power required by external electrical appliances; The maximum value of the first range is less than the minimum value of the second range, and the first range and the second range are two consecutive temperature intervals; n is a natural number not less than 1 and n≤m; The second range includes the fifth range and the sixth range, and step S3 specifically includes: S31. Determine whether the average temperature difference is in the fifth range or the sixth range. If it is in the fifth range, execute step S32; if it is in the sixth range, execute step S33; S32. Control n non-adjacent battery modules to supply power; S33 controls n non-adjacent battery modules to supply power, the total power provided by n adjacent battery modules is greater than the power required by external electrical appliances, the main control chip uses the total power to power the cooling module and external electrical appliances at the same time, and uses the cooling module to dissipate heat from the power battery pack; In step S3, the battery module selection method for each power supply includes: A. Compare the values ​​of n and m and obtain the value of m. If m is odd, execute steps B and D; if m is even, execute steps E and F. B. If m > 2n + 1, select the n battery modules with the largest remaining charge, and then determine whether the battery modules are adjacent. If so, replace the adjacent batteries. Otherwise, use the n battery modules with the largest remaining charge to supply power. C. If m=2n+1, select n battery modules that are not connected to each other for power supply; D. If m < 2n + 1, select the n battery modules with the largest remaining power to supply power; E. If m ≥ 2n, select the n battery modules with the largest remaining power, and then determine whether the battery modules are adjacent. If so, replace the adjacent batteries. Otherwise, use the n battery modules with the largest remaining power to supply power. F. If m < 2n + 1, the n battery modules with the largest remaining power are selected for power supply.

2. The power battery pack thermal management chip according to claim 1, characterized in that: The first range includes a third range and a fourth range that increase in sequence, and step S2 specifically includes: S21. Determine whether the average temperature difference is within the third range or the fourth range. If it is within the third range, execute step S22; if it is within the fourth range, execute step S23; S22. Control n adjacent battery modules to supply power to the first battery pack. The total power provided by the first battery pack is greater than the power required by the external electrical appliances. The main control chip uses the total power to power the heating module and the external electrical appliances at the same time, and uses the heating module to heat the power battery pack. S23. Control n adjacent battery modules to form a first battery group for power supply.

3. The power battery pack thermal management chip according to claim 2, characterized in that: In step S2, the battery module selected for each power supply includes: According to the number n of required battery modules, the remaining total power and temperature of n adjacent battery modules are calculated respectively; the remaining total power values ​​and average temperatures of m-n+1 first battery modules are obtained; Select the first battery group with the highest average temperature to supply power; if there is more than one first battery group with the highest average temperature, select the first battery group with the highest remaining power value among the first battery groups with the highest average temperature to supply power; Among them, the average temperature value is accurate to the single digit or the first decimal place.

4. The power battery pack thermal management chip according to claim 1, characterized in that: The controlling of a corresponding number of battery modules to supply power according to the ambient temperature, the temperature of each battery module, and the required power specifically includes: Get the power P of the required electrical energy; Obtain the temperature of the battery module and calculate the optimal energy supply power P' of the battery module; Calculate the ratio value according to k=P / P'; Get the ambient temperature. If the ambient temperature is lower than the preset value, take the integer part of k as the value of n, and if k is less than 1, n=1; If the ambient temperature is not lower than the preset value, the integer part of k is taken as the value of n after adding 1.

5. The power battery pack thermal management chip according to claim 4, characterized in that: The preset value range is 25±5°C.

6. The power battery pack thermal management chip according to claim 1, characterized in that: The FPC is also provided with a kinetic energy recovery module, which is connected to the main control chip signal. The working mode of the kinetic energy recovery module includes: Obtain the temperature and remaining power value of each battery module, and calculate the average remaining power value of all battery modules; The battery module with the highest temperature is charged. If the remaining power of the charged battery module is 10% higher than the average remaining power value, the kinetic energy recovery module charges the battery module with the second highest temperature. Among them, when there is more than one battery module with the highest temperature, the kinetic energy recovery module charges all battery modules with the highest temperature at the same time.

7. A new energy vehicle power system, characterized in that: It comprises a power battery pack and a power battery pack thermal management chip according to any one of claims 1 to 6, wherein the power battery pack thermal management chip is electrically connected to the power battery pack.

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