A battery pack control system

Abstract

This application discloses a battery pack control system, including a first battery pack, a second battery pack with higher low-temperature performance than the first battery pack, a heating component, and a battery management system. The first and second battery packs are electrically connected to the heating component and the battery management system. The heating component is disposed on at least a portion of the outer peripheral surface of the first battery pack. When the temperature of the first battery pack is lower than a first preset threshold and the first battery pack cannot supply power to the heating component, the battery management system controls the second battery pack to supply power to the heating component to heat the first battery pack. This application embodiment, by adding an additional second battery pack with higher low-temperature performance to the original first battery pack, utilizes the second battery pack to heat the first battery pack under low-temperature conditions, increasing the heating path of the first battery pack, ensuring that the heating of the first battery pack is not affected, and avoiding the first battery pack's inability to function normally in low-temperature environments due to the lack of other heating devices.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack control system. Background Technology

[0002] Lithium-ion batteries, due to their high energy density, long cycle life, and lightweight characteristics, have become the core energy source for modern electronic devices, electric vehicles, and energy storage systems. With the development of lithium-ion battery technology, the demand for lithium-ion batteries in products such as electric vehicles and energy storage systems is increasing, and the environmental requirements for lithium-ion batteries are also becoming more stringent, especially temperature, which significantly affects their lifespan, range, and safety. Extreme temperatures not only prevent lithium-ion batteries from functioning properly but may also cause thermal runaway or damage. For example, most lithium-ion battery products cannot be charged and discharged normally in low-temperature environments, otherwise, it will lead to battery damage or thermal runaway. Therefore, relevant improvements or optimizations are needed to ensure that lithium-ion batteries can be used within a relatively suitable temperature range. Utility Model Content

[0003] To address the problems of the prior art, this application provides a battery pack control system to solve one or more technical problems existing in the prior art.

[0004] This application provides a battery pack control system, which includes at least a first battery pack, a second battery pack, a heating component, and a battery management system;

[0005] The first battery pack and the second battery pack are both electrically connected to the heating component and the battery management system;

[0006] The heating component is disposed on at least a portion of the outer peripheral surface of the first battery pack;

[0007] When the temperature of the first battery pack is lower than a first preset threshold and the first battery pack is unable to supply power to the heating component, the battery management system controls the second battery pack to supply power to the heating component to heat the first battery pack.

[0008] The second battery pack has better low-temperature performance than the first battery pack.

[0009] In this embodiment, an additional second battery pack is added to the original first battery pack, and the low-temperature performance of the second battery pack is set to be higher than that of the first battery pack. The second battery pack is used to power the heating component to heat the first battery pack in low-temperature conditions, thereby increasing the heating path of the first battery pack and ensuring that the heating of the first battery pack is not affected. This avoids the first battery pack being unable to be used normally in low-temperature environments due to the lack of other heating devices.

[0010] Furthermore, in this application, the system also includes a voltage conversion module connected between the first battery pack and the second battery pack. The voltage conversion module is configured to execute a power replenishment command, which converts the voltage of the first battery pack to replenish the voltage of the second battery pack.

[0011] The heating component is connected to the voltage conversion module, and the voltage conversion module is further configured to execute a heating command, which is to convert the voltage of the second battery pack to supply power to the heating component;

[0012] The battery management system is connected to the voltage conversion module, and the battery management system is configured to issue the charging command and / or the heating command.

[0013] In this embodiment of the application, a voltage conversion module is added so that the voltage of the first battery pack can be converted by the voltage conversion module to replenish the voltage of the second battery pack, and the voltage of the second battery pack can be converted by the voltage conversion module to supply power to the heating component.

[0014] Furthermore, in this application, the system also includes a self-locking switch connected to the voltage conversion module and the battery management system. The self-locking switch is configured to, when in the open state, convert the voltage of the second battery pack through the voltage conversion module and then supply power to the battery management system.

[0015] In this embodiment, a self-locking switch is added. When the power supply of the battery management system is unavailable, the self-locking switch is activated, and the voltage of the second battery pack is converted by the voltage conversion module before being supplied to the battery management system, so as to ensure the normal operation of the battery management system and thus ensure the normal use of the first battery pack.

[0016] Furthermore, in this application, the system also includes a battery management unit connected to the first battery pack and the battery management system. The battery management unit is configured to collect individual battery pack information and temperature information of the first battery pack and upload them to the battery management system.

[0017] In this embodiment of the application, a battery management unit is added. The battery management unit collects the individual battery pack information and temperature information of the first battery pack and uploads them to the battery management system so that the battery management system can monitor the operating status of the first battery pack and determine whether the first battery pack needs to be heated.

[0018] Furthermore, in this application, the system also includes:

[0019] The heat dissipation component is connected to the battery management system and the second battery pack through the battery management unit. When the temperature of the first battery pack is higher than a second preset threshold, the battery management system controls the second battery pack to supply power to the heat dissipation component to dissipate heat from the first battery pack.

[0020] Furthermore, in this application, the first battery pack includes a lithium iron phosphate battery pack;

[0021] And / or, the second battery pack includes a lithium titanate battery pack.

[0022] Furthermore, in this application, the heating component includes a heating film.

[0023] Furthermore, in this application, the system also includes a main positive relay, a main negative relay, and a pre-charge relay and a pre-charge resistor connected in parallel across the main positive relay.

[0024] Furthermore, in this application, the system also includes:

[0025] The main circuit protection component is connected between the positive terminal of the first battery pack and the main positive relay; and / or,

[0026] A heating protection element is connected between the second battery pack and the heating assembly; and / or,

[0027] A charging protection device is connected between the positive terminal of the first battery pack and the charging port of the first battery pack.

[0028] Furthermore, in this application, the system also includes:

[0029] A Hall sensor is connected between the negative terminal of the first battery pack and the charging port of the first battery pack.

[0030] The above-described technical solutions of this application have at least one or more of the following beneficial effects:

[0031] In implementing the technical solution of this application, the system includes at least a first battery pack, a second battery pack, a heating component, and a battery management system. The low-temperature performance of the second battery pack is higher than that of the first battery pack. The first and second battery packs are electrically connected to the heating component and the battery management system. The heating component is disposed on at least a portion of the outer peripheral surface of the first battery pack. When the temperature of the first battery pack is lower than a first preset threshold and the first battery pack cannot supply power to the heating component, the battery management system controls the second battery pack to supply power to the heating component to heat the first battery pack. By adding an additional second battery pack to the original first battery pack and setting the low-temperature performance of the second battery pack to be higher than that of the first battery pack, the second battery pack is used to heat the first battery pack under low-temperature conditions, increasing the heating path of the first battery pack and ensuring that the heating of the first battery pack is not affected, thus avoiding the first battery pack's inability to function normally in low-temperature environments due to the lack of other heating devices.

[0032] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0033] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the drawings are used to denote similar components, wherein:

[0034] Figure 1 This is a schematic diagram of the circuit structure of the battery pack control system provided in the embodiments of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100, First battery pack; 200, Second battery pack; 300, Heating assembly; 400, Battery management system; 500, Voltage conversion module; 600, Self-locking switch; 700, Battery management unit; 800, Heat dissipation assembly; 910, Main circuit protection component; 920, Heating protection component; 930, Charging protection component; 1000, Hall sensor; K0, Charging relay; K1, Main positive relay; K2, Main negative relay; K3, Pre-charge relay; R1, Pre-charge resistor. Detailed Implementation

[0037] Some embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0038] As described in the background section, most lithium battery products cannot be charged and discharged normally in low-temperature environments, otherwise it will lead to damage or thermal runaway of the lithium battery. To address this problem, this application proposes a battery pack control system. This battery pack control system adds an additional second battery pack to the original first battery pack, and sets the low-temperature performance of the second battery pack to be higher than that of the first battery pack. The second battery pack supplies power to the heating components to heat the first battery pack in low-temperature conditions, thereby increasing the heating path of the first battery pack and ensuring that the heating of the first battery pack is not affected. This allows the first battery pack to be used at a relatively suitable temperature, avoiding the inability of the first battery pack to function normally in low-temperature environments due to the lack of other heating devices.

[0039] The solution of this application will now be described in detail with reference to the accompanying drawings and various embodiments.

[0040] Figure 1 This is a schematic diagram of the circuit structure of the battery pack control system provided in the embodiments of this application, with reference to... Figure 1 As shown, the battery pack control system includes at least a first battery pack 100, a second battery pack 200, a heating assembly 300, and a battery management system 400. The first battery pack 100 and the second battery pack 200 are electrically connected to both the heating assembly 300 and the battery management system 400. The heating assembly 300 is configured to be disposed on at least a portion of the outer peripheral surface of the first battery pack 100 to heat the first battery pack 100. The battery management system 400 is configured to detect and control the operating status of the entire battery system to ensure the safe use of the entire system.

[0041] In some specific embodiments, the low-temperature performance of the second battery pack 200 is higher than that of the first battery pack 100. Therefore, the second battery pack 200 can still operate normally in some low-temperature environments. Thus, when the temperature of the first battery pack 100 is lower than a first preset threshold and requires heating by the heating component 300, and the first battery pack 100 cannot supply power to the heating component 300 due to reasons such as being unable to operate at low temperatures, the battery management system 400 controls the second battery pack 200, which has higher low-temperature performance, to supply power to the heating component 300 to heat the first battery pack 100. This ensures that the heating of the first battery pack 100 is not affected, allowing the first battery pack 100 to be used at a relatively suitable temperature, and avoiding the inability of the first battery pack 100 to operate normally in low-temperature environments due to the lack of other heating devices.

[0042] It should be noted that the embodiments of this application do not specifically limit the first preset threshold. Without departing from the inventive concept of this application, the specific value of the first preset threshold can be set according to the specific performance of the first battery pack 100. As an exemplary and not restrictive description, the first preset threshold can be 0°C.

[0043] It should be noted that the first battery pack 100 in this embodiment, as an energy source, generally possesses characteristics such as high energy density, long cycle life, and lightweight, thus enabling it to be widely used as a core energy source in modern electronic devices, electric vehicles, and energy storage systems. However, the first battery pack 100 has poor low-temperature performance; for example, it cannot be charged and discharged normally below zero degrees Celsius or can only discharge at a very low rate. In some specific embodiments, the first battery pack 100 can be a lithium iron phosphate battery pack. It is understood that the first battery pack 100 in this embodiment, besides a lithium iron phosphate battery pack, can also be other battery packs with similar product characteristics to lithium iron phosphate battery packs.

[0044] It should be noted that the second battery pack 200 in this embodiment has good temperature adaptability. Preferably, the low-temperature performance of the second battery pack 200 is higher than that of the first battery pack 100. In some specific embodiments, the second battery pack 200 can be a lithium titanate battery pack. Lithium titanate battery packs can be charged and discharged at -40°C and can be charged and discharged at a high rate (6C), and have the characteristics of high safety performance and low voltage platform. It is understood that the second battery pack 200 in this embodiment can be any other battery pack with the same or higher performance than lithium titanate battery packs, in addition to lithium titanate battery packs.

[0045] In summary, this embodiment of the application utilizes the performance differences (such as low-temperature performance) between two different battery packs. By adding an additional second battery pack 200 within the original first battery pack 100, which serves as the energy source, it acts as a heating source and backup power for the first battery pack 100. This allows the temperature of the first battery pack 100 to be raised to a suitable range in a short time, quickly restoring its normal performance and enabling rapid start-up. Furthermore, it avoids damage to the first battery pack 100 caused by low-temperature charging, thus extending its service life. Depending on actual needs, it can flexibly switch between the first battery pack 100 and the second battery pack 200, thereby optimizing overall energy utilization efficiency and circuit design. Combined with the battery management system 400, it can monitor the status of the first battery pack 100 and the second battery pack 200 in real time, dynamically adjusting the energy distribution between them according to the current operating conditions. This ensures efficient operation of the battery system, improves the overall performance of the battery pack, and guarantees the reliability of the battery pack (mainly referring to the first battery pack as the energy source) heating and use.

[0046] In some specific embodiments, the heating component 300 may be a heating film that covers at least a portion of the outer peripheral surface of the first battery pack 100. When the heating film is powered, the first battery pack 100 can be heated by the heating film.

[0047] Further reference Figure 1As shown, in some specific embodiments, the system further includes a voltage conversion module 500. The voltage conversion module 500 is configured to have functions such as voltage conversion. In specific implementations, the voltage conversion module 500 is connected between the first battery pack 100 and the second battery pack 200, and the heating component 300 and the battery management system 400 are also connected to the voltage conversion module 500. Further, the voltage conversion module 500 is configured to execute a charging command, which converts the voltage of the first battery pack 100 to charge the second battery pack 200; the voltage conversion module 500 is also configured to execute a heating command, which converts the voltage of the second battery pack 200 to supply power to the heating component 300. The charging command and the heating command are issued by the battery management system 400.

[0048] In some specific embodiments, the battery management system 400 determines whether to send a power replenishment command or a heating command to the voltage conversion module 500 based on the overall operating status of the battery system. When the battery management system 400 determines that the second battery pack 200 has insufficient power, it sends a power replenishment command to the voltage conversion module 500 so that the voltage conversion module 500 executes the power replenishment command to convert the voltage of the first battery pack 100 to replenish the second battery pack 200. When the battery management system 400 determines that the temperature of the first battery pack 100 is lower than a first preset threshold and the first battery pack 100 cannot supply power to the heating component 300, it sends a heating command to the voltage conversion module 500 so that the voltage conversion module 500 executes the heating command to convert the voltage of the second battery pack 200 to supply power to the heating component 300.

[0049] Understandably, the second battery pack 200 typically has a low capacity; it only needs to ensure that the heating component 300 heats the first battery pack 100 at a specific temperature and power for a certain period of time to reach the required temperature (e.g., ensuring that the heating component 300 heats at 300W for 1 hour, so that the temperature rise of the first battery pack 100 reaches 20℃). This can be customized based on the capacity of the second battery pack 200 and the heating efficiency of the heating component 300. Furthermore, the second battery pack 200 is very small, occupying almost no space in the first battery pack 100, and is a simple internal power source. Therefore, recharging the second battery pack 200 is relatively convenient because its platform voltage is low. Thus, even when the individual cells in the first battery pack 100 are at low voltage, the second battery pack 200 can still be recharged. Moreover, since the second battery pack 200 has a low capacity, the recharging speed is fast, ensuring its continuous operation.

[0050] In practice, when the voltage conversion module 500 detects that the charge of a single cell in the second battery pack 200 is too low, it will send a low charge alarm message to the battery management system 400. After receiving the alarm message from the voltage conversion module 500, the battery management system 400 will replenish the charge according to the status of the first battery pack 100. There are three ways to replenish the charge:

[0051] 1) When the first battery pack 100 is in a charging state, the second battery pack 200 can be charged by the charging device. The charging will stop when the second battery pack 200 is fully charged. If the charging device cannot provide the charging function, the battery management system 400 can send a charging command to the voltage conversion module 500 to charge the second battery pack 200 using the first battery pack 100. The charging will end when the charging is fully charged.

[0052] 2) When the first battery pack 100 is in a discharging state, the battery management system 400 sends a charging command to the voltage conversion module 500 to charge the second battery pack 200 using the first battery pack 100. The charging is completed and then the charging ends.

[0053] 3) When the first battery pack 100 is in a static state, the battery management system 400 sends a power replenishment command to the voltage conversion module 500 to replenish the second battery pack 200 using the first battery pack 100.

[0054] In some specific embodiments, the voltage conversion module 500 can be a DC-DC converter. The DC-DC converter can be an existing DC-DC converter. It can also be customized according to actual product requirements. For example, it can be configured with an internal control module to perform related operations based on instructions received from the battery management system 400, or it can be configured to have information acquisition capabilities to collect individual cell information of the second battery pack 200, so as to determine whether the second battery pack 200 needs to be recharged.

[0055] In specific implementation, when the first battery pack 100 is in a charging state, if the battery management system 400 determines that the temperature of the first battery pack 100 is lower than a first preset threshold, the battery management system 400 determines that the first battery pack 100 needs to be heated to ensure that the first battery pack 100 can operate normally. Since the first battery pack 100 is in a charging state at this time, a heating current can be input to the heating component 300 through the charging device so that the heating component 300 can heat the first battery pack 100 until the temperature of the first battery pack 100 is normal and reaches the preset threshold, at which point heating stops. If the charging device cannot provide a heating source, the battery management system 400 can send a heating command to the voltage conversion module 500. After receiving the heating command, the voltage conversion module 500 starts the second battery pack 200 and supplies power to the heating component 300 through the voltage conversion module 500 to ensure that the temperature of the first battery pack 100 rises. When the temperature of the first battery pack 100 rises to the normal charging temperature, the charging strategy of the first battery pack 100 is activated. When the temperature of the first battery pack 100 rises to a certain value, the heating stops (this temperature value can be set according to the actual situation or experience, such as 5℃, 10℃, etc., and is not specifically limited here).

[0056] When the battery management system 400 determines that the first battery pack 100 needs to be heated to ensure its normal operation, if the first battery pack 100 is in a state where discharge is prohibited, the battery management system 400 sends a heating command to the voltage conversion module 500. After receiving the command, the voltage conversion module 500 starts the heating mode of the second battery pack 200. When the temperature of the first battery pack 100 is heated to a certain threshold (this certain threshold can be set according to the relevant performance parameters of the first battery pack), the first battery pack 100 can perform low-rate discharge. As the discharge time and heating time increase, the temperature of the first battery pack 100 will also increase. When the temperature of the first battery pack 100 reaches a certain value, heating stops. If the ambient temperature of the first battery pack 100 is too low, the temperature of the first battery pack 100 will continue to decrease as the discharge time increases. When it drops to a certain temperature value, the battery management system 400 detects this value and starts the heating mode again. This cycle is repeated to ensure that the first battery pack 100 will not become unusable due to its low temperature.

[0057] Further reference Figure 1As shown, in some specific embodiments, the battery pack control system further includes a self-locking switch 600. The self-locking switch 600 is connected to both the voltage conversion module 500 and the battery management system 400. The self-locking switch 600 is configured to, when open, convert the voltage of the second battery pack 200 through the voltage conversion module 500 and then supply power to the battery management system 400. It is understood that the operation of the battery management system 400 typically depends on the power supply of its power source. When the power supply to the battery management system 400 is unavailable, the battery management system 400 cannot power on normally, thus preventing the normal use of the first battery pack 100. To address this problem, in this embodiment, a self-locking switch 600 is added. When the self-locking switch 600 is opened, it converts the voltage of the second battery pack 200 into a voltage usable by the battery management system 400 through the voltage conversion module 500. At this time, the battery management system 400 can power on normally, and thus the first battery pack 100 can be used normally. Understandably, after use, the self-locking switch 600 should be turned off to stop power supply to the battery management system 400.

[0058] In some other specific embodiments, the second battery pack 200 can also be used by turning on the self-locking switch 600 as a wake-up source or short-term power supply for the battery management system 400 or the voltage conversion module 500. The specific working method can be referred to the way the second battery pack 200 supplies power to the battery management system 400, which will not be described in detail here.

[0059] Further reference Figure 1 As shown, in some specific embodiments, the battery pack control system further includes a battery management unit 700. The battery management unit 700 is connected to both the first battery pack 100 and the battery management system 400. The battery management unit 700 is configured to collect individual battery cell information and temperature information from the first battery pack 100 and upload it to the battery management system 400, so that the battery management system 400 can determine whether the first battery pack 100 needs to be heated or cooled based on the individual battery cell information and temperature information.

[0060] Further reference Figure 1As shown, in some specific embodiments, the battery pack control system further includes a heat dissipation component 800. The heat dissipation component 800 is configured to be connected to the battery management system 400 and the second battery pack 200 via the battery management unit 700. When the battery management system 400 determines that the temperature of the first battery pack 100 is higher than a second preset threshold, the battery management system 400 determines that heat dissipation of the first battery pack 100 is required. At this time, the battery management system 400 controls the second battery pack 200 to supply power to the heat dissipation component 800 to dissipate heat from the first battery pack 100, avoiding the risk of thermal runaway due to excessive temperature, and ensuring the normal operation and safety of the first battery pack 100.

[0061] It should be noted that the embodiments of this application do not limit the specific structure of the heat dissipation component 800. Without departing from the inventive concept of this application, any known heat dissipation component that can be used in a battery pack system can be used as the heat dissipation component 800 in this application. For example, as an exemplary and not restrictive illustration, the heat dissipation component 800 can be a fan.

[0062] Further reference Figure 1 As shown, in some specific embodiments, the battery pack control system further includes a main positive relay K1, a main negative relay K2, a pre-charge relay K3 and a pre-charge resistor R1 connected in parallel across the main positive relay K1, and a charging relay K0. The main positive relay K1 is connected between the positive terminal of the first battery pack 100 and its discharge port, and is configured to connect or disconnect the positive power supply of the main circuit. The main negative relay K2 is connected between the negative terminal of the first battery pack 100 and its charging port, and is configured to control the connection and disconnection of the negative terminal (negative power supply) of the main circuit. The pre-charge relay K3 and the pre-charge resistor R1 are configured to prevent instantaneous large current surges when the main relay is closed. The charging relay K0 is connected between the positive terminal of the first battery pack 100 and its charging port, and is configured to safely connect or disconnect the charging circuit of the first battery pack 100, working in conjunction with the pre-charge circuit, the charging protection device 930, and the battery management system 400.

[0063] Further reference Figure 1 As shown, to protect the circuit safety, in some specific embodiments, the battery pack control system is further provided with a main circuit protection component 910, a heating protection component 920, and a charging protection component 930. The main circuit protection component 910 is configured to connect between the positive terminal of the first battery pack 100 and the main positive relay K1 to ensure the safety of the battery system's main circuit. The heating protection component 920 is configured to connect between the second battery pack 200 and the heating assembly 300 to ensure the electrical safety of the heating circuit. The charging protection component 930 is configured to connect between the positive terminal of the first battery pack 100 and the charging port of the first battery pack 100 to ensure the circuit safety of the charging circuit.

[0064] Further reference Figure 1 As shown, in some specific embodiments, the battery pack control system is further provided with a Hall sensor 1000. The Hall sensor 1000 is configured to be connected between the negative terminal of the first battery pack 100 and the charging port of the first battery pack 100, for collecting the current of the battery system circuit.

[0065] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0066] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0068] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0069] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery pack control system, characterized by, The system includes at least a first battery pack (100), a second battery pack (200), a heating assembly (300), and a battery management system (400). The first battery pack (100) and the second battery pack (200) are both electrically connected to the heating assembly (300) and the battery management system (400); The heating component (300) is disposed on at least a portion of the outer peripheral surface of the first battery pack (100); When the temperature of the first battery pack (100) is lower than a first preset threshold and the first battery pack (100) is unable to supply power to the heating component (300), the battery management system (400) controls the second battery pack (200) to supply power to the heating component (300) to heat the first battery pack (100); The low-temperature performance of the second battery pack (200) is better than that of the first battery pack (100).

2. The battery pack control system of claim 1, wherein, The system further includes a voltage conversion module (500) connected between the first battery pack (100) and the second battery pack (200), the voltage conversion module (500) being configured to execute a power replenishment command, the power replenishment command being to convert the voltage of the first battery pack (100) to replenish the second battery pack (200); The heating component (300) is connected to the voltage conversion module (500), and the voltage conversion module (500) is further configured to execute a heating command, which is to convert the voltage of the second battery pack (200) to power the heating component (300); The battery management system (400) is connected to the voltage conversion module (500), and the battery management system (400) is configured to issue the charging command and / or the heating command.

3. The battery pack control system of claim 2, wherein, The system also includes a self-locking switch (600) connected to the voltage conversion module (500) and the battery management system (400). The self-locking switch (600) is configured to, when in the open state, convert the voltage of the second battery pack (200) through the voltage conversion module (500) and supply power to the battery management system (400).

4. The battery pack control system of claim 1, wherein, The system also includes a battery management unit (700) connected to the first battery pack (100) and the battery management system (400), the battery management unit (700) being configured to collect battery pack individual cell information and temperature information of the first battery pack (100) and upload them to the battery management system (400).

5. The battery pack control system of claim 4, wherein, The system also includes: The heat dissipation component (800) is connected to the battery management system (400) and the second battery pack (200) through the battery management unit (700). When the temperature of the first battery pack (100) is higher than a second preset threshold, the battery management system (400) controls the second battery pack (200) to supply power to the heat dissipation component (800) to dissipate heat from the first battery pack (100).

6. The battery pack control system of any one of claims 1 to 5, wherein, The first battery pack (100) includes a lithium iron phosphate battery pack; And / or, the second battery pack (200) includes a lithium titanate battery pack.

7. The battery pack control system of any one of claims 1 to 5, wherein, The heating component (300) includes a heating film.

8. The battery pack control system of any one of claims 1 to 5, wherein, The system also includes a main positive relay (K1), a main negative relay (K2), a pre-charge relay (K3) connected in parallel across the main positive relay (K1), and a pre-charge resistor (R1).

9. The battery pack control system of claim 8, wherein, The system also includes: The main circuit protection element (910) is connected between the positive terminal of the first battery pack (100) and the main positive relay (K1); and / or, A heating protection element (920) is connected between the second battery pack (200) and the heating assembly (300); and / or, A charging protection device (930) is connected between the positive terminal of the first battery pack (100) and the charging port of the first battery pack (100).

10. The battery pack control system of any one of claims 1-5, wherein, The system also includes: A Hall sensor (1000) is connected between the negative terminal of the first battery pack (100) and the charging port of the first battery pack (100).

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