Power battery pack thermal management chip and system

Abstract

The invention relates to the technical field of power battery packs, in particular to a power battery pack thermal management chip and system, the power battery pack thermal management chip comprises an FPC, a main control chip, a temperature measurement module and m battery control modules, the main control chip, the temperature measurement module and the m battery control modules are all arranged on the FPC, and the temperature measurement module, a heat dissipation module, a heating module and the m battery control modules are all in signal connection with the main control chip; the temperature measuring module comprises an environment temperature measuring device and m temperature sensors, the environment temperature measuring device is used for obtaining the environment temperature of the space where the power battery pack is located, and the temperature sensors are used for sensing the temperature of the single battery module; and the main control chip is used for controlling the battery modules with the corresponding number and positions to supply power according to the environment temperature, the temperature of each battery module and the required electric energy. By combining the temperature of the environment where the power battery pack is located, the actual temperature of each battery module and the electric energy needing to be provided, the corresponding number of battery modules are controlled to supply power, so that the working efficiency of the battery modules is kept optimal at the current temperature as far as possible.

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] At present, the power battery packs used in new energy vehicles are usually ternary lithium batteries or lithium iron phosphate batteries. When these power battery packs are actually used, they have an optimal operating temperature range. When the ambient temperature is lower than the optimal operating temperature range, the activity of the battery will decrease; when the ambient temperature is higher than the optimal operating temperature range, the battery will overheat, reducing its lifespan or even burning out severely.

[0003] Therefore, in a power battery pack, a thermal management chip is usually used to control it. By coordinating the control of the thermal management chip with the heating module and the cooling module, the temperature of the power battery pack during operation can be kept within the optimal operating temperature range as much as possible.

[0004] In the existing thermal management solutions, it is usually achieved by combining multiple parameters and then controlling the heating module and the cooling module, without considering the problem of 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] The present invention provides a power battery pack thermal management chip and system for the problems of the prior art, which combines the heat generated by the power battery pack itself during power supply into the thermal management, so that the output power of the power battery pack better matches the current temperature.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A power battery pack thermal management chip provided by the present invention includes 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 disposed on the FPC. The temperature measurement module, the heat dissipation module, the heating module, and the m battery control modules are all signal-connected to the main control chip, and the m battery control modules are respectively connected to m battery modules in an external power battery pack in a one-to-one correspondence;

[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, and the m temperature sensors are respectively arranged corresponding to the m battery modules, and the temperature sensors are used to sense the temperature of a single battery module;

[0009] The heat dissipation module is used to connect to an external radiator;

[0010] The heating module is used to raise the temperature of the battery module;

[0011] The master control chip is used to control the power supply of corresponding numbers and positions of battery modules according to the ambient temperature, the temperatures of each battery module, and the required electric energy.

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

[0013] Furthermore, the actions of the master control chip specifically include:

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

[0015] S2. If the average temperature difference is within the first range, control n adjacent battery modules to supply power according to the required electric energy of the external electrical appliance.

[0016] S3. If the average temperature difference is within the second range, control n non-adjacent battery modules to supply power according to the required electric energy of the external electrical appliance.

[0017] Where 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.

[0018] Even further, the first range includes a third range and a fourth range that increase in sequence. 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 group. The total electric energy provided by the first battery group is greater than the required electric energy of the external electrical appliance. The master control chip uses the total electric energy to supply power to the heating module and the external electrical appliance 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 to supply power.

[0022] Even further, in step S2, the selection method of the battery modules used for each power supply includes:

[0023] According to the required number n of battery modules, calculate the remaining total electric energy and temperature of n adjacent battery modules respectively; obtain the remaining total electric energy values and average temperatures of m - n + 1 first battery groups.

[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 electric energy 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 units digit or the first digit after the decimal point.

[0026] Furthermore, the second range includes a fifth range and a 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 supply power. The total electric energy provided by n adjacent battery modules is greater than the electric energy required by the external electrical appliance. The main control chip uses the total electric energy to supply power to the heat dissipation module and the external electrical appliance at the same time, and uses the heat dissipation module to dissipate heat from the power battery pack.

[0030] Furthermore, in step S3, the selection method of the battery modules used 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 - D; if m is even, execute steps E and F;

[0032] B. If m > 2n + 1, select the n battery modules with the most remaining current, and then determine whether there is an adjacent relationship among the battery modules. If there is, replace the adjacent batteries; otherwise, use the n battery modules with the most remaining current to supply power;

[0033] C. If m = 2n + 1, select n non - connected battery modules to supply power;

[0034] D. If m < 2n + 1, select the n battery modules with the most remaining current to supply power;

[0035] E. If m ≥ 2n, select the n battery modules with the most remaining current, and then determine whether there is an adjacent relationship among the battery modules. If there is, replace the adjacent batteries; otherwise, use the n battery modules with the most remaining current to supply power;

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

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

[0038] Obtain the power P of the required electric energy;

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

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

[0041] Obtain 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, then n = 1;

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

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

[0044] Further, the FPC is also provided with a kinetic energy recovery module, and the kinetic energy recovery module is signal-connected to the main control chip. The working modes of the kinetic energy recovery module include:

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

[0046] Charge the battery module with the highest temperature. 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 the battery modules with the highest temperature simultaneously.

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

[0049] Advantages of the present invention: The present invention combines the ambient temperature where the power battery pack is located, the actual temperature of each battery module, and the required electrical energy to control the corresponding number of battery modules to supply power, so as to keep the working efficiency of the battery module as optimal as possible at the current temperature, achieving a better thermal management effect. Description of the Drawings

[0050] Figure 1 It is a schematic diagram of Embodiment 1.

[0051] Figure 2 It is a schematic diagram of Embodiment 2.

[0052] Reference numerals: 1—FPC, 2—main control chip, 3—temperature measurement module, 4—heat dissipation module, 5—heating module, 6—battery control module, 7—kinetic energy recovery module, 8—power battery pack, 31—ambient temperature detector, 32—temperature sensor, 81—battery module. Detailed implementation mode

[0053] For the convenience of those skilled in the art to understand, the present invention will be further described below in conjunction with embodiments and the accompanying drawings. The content mentioned in the implementation mode does not limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0054] Embodiment 1

[0055] As Figure 1 shown, this embodiment provides a power battery pack thermal management chip, including an FPC 1, 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 arranged on the FPC 1. 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 to m battery modules 81 in the external power battery pack 8 in a one-to-one correspondence;

[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 arranged in a one-to-one correspondence with the m battery modules 81, and the temperature sensors 32 are used to sense the temperature of a single battery module 81;

[0057] The heat dissipation module 4 is used to connect an external radiator;

[0058] The heating module 5 is used to raise the temperature of the battery module 81;

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

[0060] Among them, 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 respectively. After the main control chip 2 calculates the required energy according to an external instruction, combined with the current ambient temperature and the temperature of each battery module 81, it controls the battery modules 81 that meet the requirements to discharge, so as to provide electric energy.

[0062] The compliance described in this embodiment includes: after the battery module 81 discharges to a certain extent, its temperature will rise. Due to reasons such as process and position, different battery modules 81 will not have different temperatures even when discharging simultaneously. Based on this, when the ambient temperature is relatively high, the battery module 81 with a relatively low current temperature is preferentially selected for discharging, and when the ambient temperature is relatively low, the battery module 81 with a relatively high current temperature is preferentially selected for discharging. That is, during each discharge, it is not necessary for all the battery modules 81 to discharge together, but the corresponding number of battery modules 81 is reasonably arranged to discharge at the optimal power under the current ambient temperature, so as to ensure that the discharge efficiency and heat generation of the battery module 81 are achieved under the current optimal conditions, which is beneficial for thermal management.

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

[0064] S1. Obtain the ambient temperature and the temperatures of each battery module 81, and then calculate the average temperature difference between the ambient temperature and the temperatures of each battery module 81;

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

[0066] S3. If the average temperature difference is within the second range, control n non - adjacent battery modules 81 to supply power according to the electrical energy required by the external electrical appliance;

[0067] Wherein, 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.

[0068] In actual operation, the first range corresponds to the lower temperature interval, and the second range corresponds to the higher temperature interval. In the first range, it is preferably to let adjacent battery modules 81 supply power simultaneously, so that the position where heat is generated is relatively concentrated, ensuring that the temperature around the discharging battery module 81 rises significantly and rapidly, so that the discharge efficiency of the battery module 81 can reach the best as soon as possible; after the subsequent cooperation with the external heating module 5 to heat up the entire power battery pack 8, then other battery modules 81 that have entered the best discharge efficiency are used for discharging. Similarly, in the second range, the surrounding ambient temperature is relatively high. At this time, it is more inclined to let non - adjacent battery modules 81 supply power, so that the heat generated during the discharge of the battery module 81 will not accumulate in a certain local area, which is beneficial for the heat dissipation module 4 to dissipate heat, and also ensures that a single battery module 81 will not have its life reduced due to a rapid increase in temperature.

[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 in the third range or the fourth range. If it is in the third range, execute step S22; if it is in the fourth range, execute step S23;

[0071] S22. Control the first battery pack of n adjacent battery modules 81 to supply power. The total electric energy provided by the first battery pack is greater than the required electric energy of the external electrical appliance. The main control chip 2 uses the total electric energy to supply power to the heating module 5 and the external electrical appliance 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 pack to supply power.

[0073] The third range and the fourth range are two consecutive 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, not only adjacent battery modules 81 need to discharge to ensure that the heat will not dissipate too quickly, but also the heating module 5 needs to be used to keep the power battery pack 8 warm so that the power battery pack 8 can work normally; while in the fourth range, it can be understood as 10 - 25°C. Although the temperature is not high, the heating module 5 does not need to keep warm, 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 from the local temperature rise of the power battery pack 8, the heat gradually spreads to other battery modules 81, and after the other battery modules 81 are heated up, they can also participate in the discharge work. In this way, the reasonable utilization of heat is cleverly realized.

[0074] Preferably, in step S2, the selection method of the battery module 81 used for each power supply includes:

[0075] According to the required number n of battery modules 81, calculate the remaining total electric energy and temperature of n adjacent battery modules 81 respectively; obtain the remaining total electric energy values and average temperatures of m - n + 1 first battery packs;

[0076] Select the first battery pack with the highest average temperature for power supply; if there is more than one first battery pack with the highest average temperature, select the first battery pack with the highest remaining electric energy value among the first battery packs with the highest average temperature for power supply;

[0077] Among them, the average temperature value is accurate to the unit digit or the first digit after the decimal point.

[0078] For example, for battery modules 81 with values of 1, 2, 3, and 4 respectively, when n = 2, the first battery groups are three combinations: 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, then the first battery group is selected for work according to the above method with the average temperature as the highest priority. When the power battery pack 8 starts to work, the temperatures of each first battery group are basically the same. At this time, the first battery group with a high remaining power is preferentially used for power supply, achieving the effect of reasonable discharge. Of course, if the average temperature and the remaining power are also the same within the error range, then 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 spread outwards, improving the heat utilization efficiency.

[0079] Specifically, the second range includes a fifth range and a 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. Control n non-adjacent battery modules 81 to supply power;

[0082] S33. Control n non-adjacent battery modules 81 to supply power. The total electric energy provided by the n adjacent battery modules 81 is greater than the electric energy required by the external electrical appliance. The main control chip 2 uses the total electric energy to supply power to the heat dissipation module 4 and the external electrical appliance 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 consecutive temperature intervals. The fifth range can be 25 - 30 degrees Celsius, and the sixth range is above 30°C. In the fifth range, as long as the battery module 81 does not discharge at a high power, then the battery module 81 will surely work at a comfortable temperature. Therefore, in order to avoid heat accumulation, the battery modules 81 that work at the same time are preferably non-adjacent battery modules 81 to work, so as to ensure that the heat generation is relatively dispersed, which is conducive to timely heat dissipation. Similarly, in the sixth range, it is necessary to cooperate with the heat dissipation module 4 for cooling to ensure that the battery module 81 will not overheat and affect its lifespan or even pose a safety hazard.

[0084] Specifically, in step S3, the selection method of the battery module 81 for each power supply includes:

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

[0086] B. If m > 2n + 1, then select the n battery modules 81 with the most residual current, and then determine whether there is an adjacent relationship among the battery modules 81. If so, replace the adjacent batteries; otherwise, supply power with the n battery modules 81 with the most residual current.

[0087] C. If m = 2n + 1, then select n non-connected battery modules 81 to supply power.

[0088] D. If m < 2n + 1, then select the n battery modules 81 with the most residual current to supply power.

[0089] E. If m ≥ 2n, then select the n battery modules 81 with the most residual current, and then determine whether there is an adjacent relationship among the battery modules 81. If so, replace the adjacent batteries; otherwise, supply power with the n battery modules 81 with the most residual current.

[0090] F. If m < 2n + 1, then select the n battery modules 81 with the most residual current to supply power.

[0091] That is, if non-adjacent battery modules 81 need to work, it is necessary to meet the condition: if m is odd, then m ≥ 2n + 1; if m is even, then m ≥ 2n. However, when the external electrical appliance has a high demand for electric energy, more battery modules 81 must participate in discharging. At this time, it is impossible to keep non-adjacent battery modules 81 discharging, so only as many battery modules 81 as possible can be allowed to discharge, so that the temperature of the battery modules 81 will not rise too fast during discharging and heat dissipation can be carried out in time.

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

[0093] Obtain the power P of the required electric energy;

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

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

[0096] Obtain 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, then n = 1;

[0097] If the ambient temperature is not lower than the preset value, then take the integer part of k plus 1 as the value of n.

[0098] During actual use, the value range of the preset value is 25 ± 5°C. Taking 25°C as an example of the preset value, 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. In this way, the battery module 81 can release heat at a higher power, enabling the temperature to quickly accumulate and increase. If the ambient temperature is not lower than 25°C, m = 10, and k = 2.110 is calculated, then the value is taken as n = 2 + 1 = 3, allowing the battery module 81 to discharge at a lower power. Combining with the non-adjacent selection scheme, the heat generation will not be too fast, and heat dissipation can be achieved in a timely manner.

[0099] In this embodiment, the FPC1 is further provided with a kinetic energy recovery module 7. The kinetic energy recovery module 7 is signal-connected to the main control chip 2. The working mode of the kinetic energy recovery module 7 includes:

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

[0101] Charge the battery module 81 with the highest temperature. 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] Among them, 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 simultaneously.

[0103] The kinetic energy recovery module 7 is a standard structure of new energy vehicles. It can convert the energy of the vehicle's inertial movement into electrical energy to charge the power battery pack 8 when the user releases the accelerator pedal, thereby achieving the effect of improving the endurance of the power battery pack 8. In this state, the present invention preferentially charges the battery module 81 with a high temperature because this battery module 81 must have discharged not long ago. If the power of the battery module 81 with the highest temperature is significantly higher than that of other battery modules 81, the charging is switched to other battery modules 81.

[0104] Charging the battery module 81 at a suitable temperature also ensures the charging efficiency of the battery module 81, which is beneficial to improving the efficiency of kinetic energy recovery.

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

[0106] It should be noted that the battery modules 81 of the present invention are in a parallel structure, or every two adjacent (preferably at most three) battery modules 81 are in series. With a voltage conversion module, the daily use of the electrical appliance can be ensured, and the effects described in the present invention can be achieved.

[0107] In summary, in the solution disclosed by the present invention, in addition to being equipped with the corresponding heating module 5 and heat dissipation module 4, by supplying power according to different numbers and different positions of the battery modules 81 according to the temperature, heat is prevented from being dissipated at low temperatures and piling up at high temperatures, achieving the effect of thermal management.

[0108] Embodiment 2

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

[0110] The above are only preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention is disclosed above in preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, when making some changes or modifications using the above-disclosed technical content as equivalent change equivalent embodiments, but as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical means of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A thermal management chip for a power battery pack, 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 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 signal-connected to the main control chip, and the m battery control modules are connected to m battery modules in an external power battery pack one by one; The temperature measurement module includes an ambient temperature sensor and m temperature sensors. The ambient temperature sensor is used to obtain the ambient temperature of the space where the power battery pack is located, and the m temperature sensors are arranged corresponding to the m battery modules one by one. The temperature sensors are used to sense the temperature of a single battery module; The heat dissipation module is used to connect to an external radiator; The heating module is used to raise the temperature of the battery module; The main control chip is used to control the power supply of the corresponding number and position of battery modules according to the ambient temperature, the temperature of each battery module, and the required electric energy; Among them, m is a natural number greater than 2.

2. The thermal management chip for a power battery pack according to claim 1, wherein The actions 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, control n adjacent battery modules to supply power according to the required electric energy of an external electrical appliance; S3. If the average temperature difference is within the second range, control n non-adjacent battery modules to supply power according to the required electric energy of an external electrical appliance; Among them, 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.

3. The thermal management chip for a power battery pack according to claim 2, wherein, The first range includes a third range and a fourth range that increase in sequence. Step S2 specifically includes: S21. Judge 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 form a first battery group to supply power. The total electric energy provided by the first battery group is greater than the required electric energy of the external electrical appliance. The main control chip uses the total electric energy to supply power to the heating module and the external electrical appliance 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 to supply power.

4. The thermal management chip for a power battery pack according to claim 3, wherein In step S2, the selection method of the battery modules used for each power supply includes: According to the required number n of battery modules, calculate the remaining total electric energy and temperature of n adjacent battery modules respectively; obtain the remaining total electric energy values and average temperatures of m - n + 1 first battery groups; Select the first battery group with the highest average temperature for power supply; if there is more than one first battery group with the highest average temperature, select the first battery group with the highest remaining electric energy value among the first battery groups with the highest average temperature for power supply; Among them, the average temperature value is accurate to the unit digit or the first digit after the decimal point.

5. The thermal management chip for a power battery pack according to claim 2, characterized in that, The second range includes a fifth range and a sixth range. Step S3 specifically includes: S31. Judge whether the average temperature difference is within the fifth range or the sixth range. If it is within the fifth range, execute step S32. If it is within the sixth range, execute step S33; S32. Control n non-adjacent battery modules to supply power; S33. Control n non - adjacent battery modules to supply power. The total electric energy provided by n adjacent battery modules is greater than the required electric energy of the external electrical appliance. The main control chip uses the total electric energy to supply power to the heat dissipation module and the external electrical appliance simultaneously, and uses the heat dissipation module to dissipate heat from the power battery pack.

6. The thermal management chip for a power battery pack according to claim 5, wherein In step S3, the selection method of the battery modules used 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 - D; if m is even, execute steps E and F; B. If m > 2n + 1, select the n battery modules with the most remaining current, and then determine whether there is an adjacent relationship among the battery modules. If so, replace the adjacent batteries, otherwise supply power with the n battery modules with the most remaining current; C. If m = 2n + 1, select n non - connected battery modules for power supply; D. If m < 2n + 1, select the n battery modules with the most remaining current for power supply; E. If m ≥ 2n, select the n battery modules with the most remaining current, and then determine whether there is an adjacent relationship among the battery modules. If so, replace the adjacent batteries, otherwise supply power with the n battery modules with the most remaining current; F. If m < 2n + 1, select the n battery modules with the most remaining current for power supply.

7. The thermal management chip for a power battery pack according to claim 1, wherein Controlling the corresponding number of battery modules to supply power according to the ambient temperature, the temperature of each battery module, and the required electric energy specifically includes: Obtain the power P of the required electric energy; Obtain the temperature of the battery module and calculate the optimal power supply power P' of the battery module; Calculate the ratio value according to k = P / P'; Obtain 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, take the integer part of k plus 1 as the value of n.

8. The thermal management chip for a power battery pack according to claim 7, wherein, The value range of the preset value is 25 ± 5°C.

9. The thermal management chip for a power battery pack according to claim 1, wherein The FPC is also provided with a kinetic energy recovery module. The kinetic energy recovery module is signal - connected to the main control chip. The working mode of the kinetic energy recovery module includes: Obtain the temperature and remaining charge value of each battery module, and calculate the average remaining charge value of all battery modules; Charge the battery module with the highest temperature. If the remaining charge of the charged battery module is 10% higher than the average remaining charge 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 the battery modules with the highest temperature simultaneously.

10. A power system for a new energy vehicle, characterized in that, It includes a power battery pack and the power battery pack thermal management chip according to any one of claims 1 - 9. The power battery pack thermal management chip is electrically connected to the power battery pack.

Images