Power output control method for multiple parallel battery packs and battery pack assembly

Abstract

The present application discloses a method for controlling the output of electric energy from multiple parallel battery packs and a battery pack group. The method includes: when the multiple parallel battery packs are in a normal communication state and the parameters of each battery pack are within a preset parameter range, judging the working state of the electric vehicle; when the electric vehicle is in an unlocked state, confirming the battery pack used to output electric energy based on the voltage difference of each battery pack; when the electric vehicle is in a locked state, disconnecting the communication of each battery pack and confirming one of the battery packs as the battery pack used to output electric energy; when the electric vehicle is in a riding state, confirming the battery pack used to output electric energy based on the voltage difference and power difference of each battery pack. The present application can confirm the battery pack used to output electric energy based on the status of the parallel battery packs and the status of the electric vehicle, so as to avoid damage to the battery packs due to improper parallel connection or causing fire or explosion of the battery packs.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a method for controlling the output of electric energy from a plurality of parallel battery packs and a battery pack group. Background Art

[0002] Traditional electric motorcycles generally use a single battery pack as the power system for matching. However, a single battery pack can only match a single platform model and cannot take into account electric vehicles with different voltage and power requirements. Therefore, multiple battery packs are needed for flexible use in series and parallel to match electric vehicles with different voltage and power requirements.

[0003] Although using multiple battery packs in parallel can meet the needs of electric vehicles with different voltages and power requirements, improper parallel connection can easily damage the fuses and components in the battery pack, and in severe cases, it may even cause the battery pack to catch fire or explode. Summary of the Invention

[0004] In order to overcome the problems existing in the above-mentioned prior art, the main purpose of the present application is to provide a method for controlling the power output of multiple parallel battery packs, which can avoid damage to the battery packs.

[0005] In order to achieve the above objectives, this application specifically adopts the following technical solutions:

[0006] The present application provides a method for controlling the output of electric energy from multiple parallel battery packs, which is applied to electric vehicles. The method includes:

[0007] When the plurality of parallel battery packs are in a normal communication state and the parameters of each battery pack are within a preset parameter range, determining the operating state of the electric vehicle, wherein the operating state of the electric vehicle includes a locked state, a riding state, and an unlocked state;

[0008] When the electric vehicle is in an unlocked state, determining the battery pack for outputting electric energy according to the voltage difference between the battery packs;

[0009] When the electric vehicle is in a locked state, disconnecting the communication between the battery packs and identifying one of the battery packs as a battery pack for outputting electric energy;

[0010] When the electric vehicle is in a riding state, the battery pack for outputting electric energy is determined based on the voltage difference and the power difference of each battery pack.

[0011] In some embodiments, the power output control method further includes:

[0012] When it is determined that the plurality of parallel battery packs are in an abnormal communication state, the battery pack for outputting electric energy is identified according to the address signals of the battery packs.

[0013] In some embodiments, identifying the battery pack for outputting electrical energy based on the address signal of each battery pack specifically includes:

[0014] The first battery pack whose output address signal is high is identified as the battery pack for outputting electric energy.

[0015] In some embodiments, determining the battery pack for outputting electrical energy based on the voltage difference between the battery packs specifically includes:

[0016] Determining whether a voltage difference between a minimum voltage and a maximum voltage of each battery pack is within a first preset value;

[0017] If it is determined that the voltage difference between the minimum voltage and the maximum voltage of each of the battery packs is within a first preset value, then it is determined that the battery pack for outputting electric energy is a plurality of parallel battery packs;

[0018] If it is determined that the voltage difference between the minimum voltage and the maximum voltage of each battery pack is outside the first preset value, the battery pack for outputting electric energy is determined based on the voltage of each battery pack.

[0019] In some embodiments, determining the battery pack for outputting electrical energy based on the voltage of each battery pack specifically includes:

[0020] comparing the voltages of the battery packs;

[0021] The battery pack with the largest voltage among the battery packs is identified as the battery pack for outputting electric energy.

[0022] In some embodiments, determining the battery pack for outputting electrical energy based on the voltage difference and the power difference of each battery pack specifically includes:

[0023] determining whether a voltage difference between a minimum voltage and a maximum voltage of each of the battery packs is within a second preset value;

[0024] If it is determined that the voltage difference between the minimum voltage and the maximum voltage of each battery pack is within the second preset value, further determining whether the ratio of the maximum power value to the minimum power value in each battery pack is within the third preset value;

[0025] If it is determined that the ratio of the maximum power value to the minimum power value of each battery pack is within a third preset value, it is confirmed that the battery pack for outputting electric energy is a plurality of parallel battery packs.

[0026] In some embodiments, the power output control method further includes:

[0027] If it is determined that the voltage difference between the minimum voltage and the maximum voltage of each battery pack is outside the second preset value, or the ratio of the maximum power value to the minimum power value of each battery pack is outside the third preset value, the battery pack used to output electrical energy is confirmed based on the fault condition of each battery pack.

[0028] Accordingly, the present application provides a battery pack group, which includes multiple battery packs, and the multiple battery packs are connected in parallel, wherein the battery pack group controls the output of electric energy using the electric energy output control method described in any of the above embodiments.

[0029] In some embodiments, each of the battery packs includes a shell, a battery module, a battery management system, a sampling harness module, an upper cover, a high-voltage socket and a high-voltage plug. The battery module, the battery management system and the sampling harness module are all arranged in the shell, and the battery management system is connected to the battery module assembly via the sampling harness module. The upper cover is covered on the shell, the high-voltage socket is arranged on the upper cover and connected to the battery management system, and the high-voltage plug is connected to the high-voltage socket.

[0030] In some embodiments, the high-voltage socket includes a socket body, and the socket body is provided with a signal transmission interface, a discharge total positive interface, a charge total positive interface and a charge and discharge negative interface.

[0031] The power output control method of the present application includes: when multiple parallel battery packs are in a normal communication state and the parameters of each battery pack are within a preset parameter range, judging the working state of the electric vehicle; when the electric vehicle is in an unlocked state, confirming the battery pack used to output power based on the voltage difference of each battery pack; when the electric vehicle is in a locked state, disconnecting the communication of each battery pack and confirming one of the battery packs as the battery pack used to output power; when the electric vehicle is in a riding state, confirming the battery pack used to output power based on the voltage difference and power difference of each battery pack. Compared with the existing technology, the present application can confirm the battery pack used to output power based on the status of the parallel battery packs and the status of the electric vehicle, and output power through the battery pack, thereby avoiding damage to fuses and components in the battery pack or causing fire or explosion of the battery pack due to improper parallel connection of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A three-dimensional structural diagram of a single battery pack provided in an embodiment of the present application.

[0033] Figure 2 A three-dimensional exploded view of a single battery pack provided in an embodiment of the present application.

[0034] Figure 3 for Figure 2 Schematic diagram of the battery management system and sampling harness module.

[0035] Figure 4 for Figure 2 Schematic diagram of the structure of the high-voltage socket.

[0036] Figure 5 Flowchart of a method for controlling power output of multiple parallel battery packs provided in an embodiment of the present application.

[0037] Figure 6 A block diagram of a power output control device for multiple parallel battery packs provided in an embodiment of the present application.

[0038] Figure ID:

[0039] 1. Shell; 2. Battery module; 3. Battery management system; 4. Sampling harness module; 5. Upper cover; 6. High-voltage socket; 60. Socket body; 61. Signal transmission interface; 62. Discharge total positive interface; 63. Charge total positive interface; 64. Charge and discharge negative interface; 7. High-voltage plug; 8. Vent valve; 100. Battery pack. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0041] In the description of this application, unless otherwise specified or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described from the perspectives shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also indirectly connected to the other element "on" or "under" through an intermediate element.

[0043] In the process of developing power batteries suitable for electric vehicles, it is necessary to customize and develop battery systems based on the vehicle parameter requirements of different voltages and power levels. For example, it is necessary to develop multiple different battery packs with voltages and power levels of 72V&2kwh, 72V&4kwh, and 72V&6kwh to suit electric vehicles with different power requirements.

[0044] Reference Figure 1 As shown, the present application discloses a battery pack 100. The battery pack 100 is a basic battery pack. According to the requirements of electric vehicles, multiple battery packs can be used in parallel to meet the different power requirements of electric vehicles, saving development certification cycles and development costs. Furthermore, the voltage and power of the battery pack are 72V and 2kwh. By combining multiple battery packs in parallel and controlling them through an internal battery management system, the battery packs can communicate with each other and exchange information to meet the different power requirements of electric vehicles, saving development costs and cycles. For example, the battery packs can be combined in different parallel combinations to meet the power requirements of electric vehicles with different power requirements such as 2kwh, 4kwh, and 6kwh.

[0045] Reference Figure 2 and Figure 3 As shown, the battery pack 100 comprises a housing 1, a battery module 2, a battery management system 3, a sampling wiring harness module 4, a top cover 5, a high-voltage socket 6, a high-voltage plug 7, a vent valve 8, and auxiliary components. The battery module 2 is composed of multiple soft-pack cells connected in series and parallel, along with associated high-voltage connection accessories. In this embodiment, the battery module consists of 1 soft-pack cell in parallel and 19 in series. The battery module 2, battery management system 3, and sampling wiring harness module 4 are all housed within the housing 1. The battery management system 3 connects to the battery module 2 via the sampling wiring harness module 4 and high-voltage busbars to enable signal acquisition and energy management. The top cover 5 fits over the housing 1, and the high-voltage socket 6 is mounted on the top cover 5. The high-voltage socket 6 is connected to the battery management system 3 via busbars, thereby connecting to the positive and negative electrodes within the battery module 2. This allows the battery management system 3 to control energy input and output. The high-voltage plug 7 is connected to the high-voltage socket 6, and the vent valve 8 is located on the top cover 5.

[0046] Reference Figure 4 As shown, the high-voltage socket 6 includes a socket body 60, which is provided with a signal transmission interface 61, a total positive discharge interface 62, a total positive charging interface 63 and a charge and discharge negative interface 64. That is, although the present application integrates the signal transmission interface 61, the total positive discharge interface 62, the total positive charging interface 63 and the charge and discharge negative interface 64 on the same plug-in, the total positive discharge interface 62 and the total positive charging interface 63 adopt a different port design, so that the charging circuit and the discharge circuit are two independent circuits.

[0047] The interface of the battery pack system of existing electric motorcycles adopts a design with the charging port and the discharging port being the same. That is, during the discharge process, the charging port of the entire vehicle is in a charged state, posing a high-voltage safety hazard.

[0048] This application integrates the total positive charging interface 63 and the total positive discharging interface 63 into the same plug-in (high-voltage socket), and the total positive charging interface 63 and the total positive discharging interface 63 are designed as different ports, so that the charging and discharging processes can be independently controlled, safe and reliable.

[0049] Reference Figure 5 As shown, the present application also discloses a method for controlling the power output of multiple parallel battery packs, wherein the multiple parallel battery packs are composed of at least two battery packs described in the above embodiment connected in parallel, and the power output control method includes the steps of:

[0050] S11. Determine whether the parallel battery pack is in a normal communication state. If the determination result is no, proceed to step S12. If the determination result is yes, proceed to step S13.

[0051] S12: Identify the first battery pack whose output address signal is high as the battery pack for outputting electric energy.

[0052] Specifically, the address signal emitted by each battery pack is received, and it is determined whether the received address signal is at a high level. If the received address signal is at a high level and is the first high-level address signal received, it is confirmed that the battery pack is a battery pack for outputting electrical energy, and electrical energy is output through the battery pack.

[0053] S13. Continue to determine whether the parameters of each battery pack are normal. If the determination result is no, proceed to step S14. If the determination result is yes, proceed to step S15.

[0054] Specifically, the parameters of each battery pack are compared with preset parameters. If the parameters of each battery pack are within the preset parameter range, the parameters of each battery pack are confirmed to be normal. For example, the total pressure, power, fault code and other parameters of each battery pack are obtained, and the total pressure of each battery pack is compared with the preset total pressure, the power of each battery pack is compared with the preset power, and the fault code of each battery pack is compared with the preset fault code. If the total pressure of each battery pack is within the preset total pressure range, the power of each battery pack is within the preset power range, and the fault code of each battery pack is the same as the preset fault code, then the parameters of each battery pack are normal.

[0055] S14. Issue a fault alarm.

[0056] S15. Continue to judge the working status of the electric vehicle, where the working status of the electric vehicle includes a locked state, a riding state and an unlocked state. The electric vehicle is in a locked state, which means that the electric vehicle is in a standby state. At this time, the electric vehicle is not powered, but the battery pack still needs to provide power for the BMS (battery management system). The electric vehicle is in a riding state, which means that the electric vehicle is unlocked and in a driving state. The electric vehicle is in an unlocked state, which means that the electric vehicle is powered but not in a driving state (i.e., the state of just powering on); if the electric vehicle is in an unlocked state, proceed to steps S16 to S19, that is, confirm the battery pack for outputting electric energy according to the voltage difference of each battery pack; if the electric vehicle is in a locked state, proceed to step S20; if the electric vehicle is in a riding state, proceed to steps S21 to S24, that is, confirm the battery pack for outputting electric energy according to the voltage difference and power difference of each battery pack.

[0057] S16: Determine whether the voltage difference between the minimum voltage and the maximum voltage of each battery pack is within a first preset value. If yes, proceed to step S17; if not, proceed to steps S18-S19.

[0058] S17: Confirm that the battery pack used to output electric energy is a plurality of parallel battery packs.

[0059] S18. Compare the voltages of the battery packs.

[0060] S19: Determine the battery pack with the largest voltage among the battery packs as the battery pack for outputting electric energy.

[0061] Specifically, if the voltage difference between the minimum and maximum values ​​of each battery pack is within 2V, the battery packs can be connected in parallel to output power. That is, multiple parallel battery packs can be used to output power together to power the electric vehicle. If the voltage difference between the minimum and maximum values ​​of each battery pack is greater than 2V, the battery packs cannot be connected in parallel to output power. That is, the battery packs cannot output power together to power the electric vehicle. Instead, the battery packs with the highest voltage are compared and identified as the battery pack for power output. This battery pack is then used to power the electric vehicle.

[0062] When the electric vehicle is in an unlocked state, only when it is determined that the voltage difference between the minimum voltage and the maximum voltage of each battery pack is within a first preset value, is it confirmed that the battery pack used to output electric energy is a plurality of parallel battery packs. This is because if the voltage difference between the battery packs is too large, and due to the characteristics of the battery pack, its internal resistance is relatively small, if the battery packs are output in parallel, it may cause a short circuit in the battery pack, damaging the fuse and components in the battery pack, and in severe cases even causing the battery pack to catch fire or explode.

[0063] S20: Disconnect the communication between the battery packs and identify one of the battery packs as the battery pack for outputting electric energy.

[0064] Specifically, the battery packs cannot be connected in parallel to output power, and power can only be output through a certain battery pack.

[0065] S21. Determine whether the voltage difference between the minimum voltage and the maximum voltage of each battery pack is within a second preset value. If yes, proceed to steps S22 to S23. If no, proceed to step S24.

[0066] S22. Continue to determine whether the ratio of the maximum power value to the minimum power value in each battery pack is within a third preset value. If the determination result is yes, proceed to step S23; if the determination result is no, proceed to step S24.

[0067] S23. Confirm that the battery pack used to output electric energy is a plurality of parallel battery packs.

[0068] S24 . Determine the battery pack for outputting electric energy according to the fault condition of each battery pack.

[0069] Specifically, if the voltage difference between the minimum and maximum values ​​of each battery pack is within 2V, and the ratio of the maximum to minimum charge value is within 1.15, then the battery packs can be connected in parallel to output power, that is, multiple parallel battery packs can be used to output power together to provide power to the electric vehicle. If the voltage difference between the minimum and maximum values ​​of each battery pack is outside 2V, or the ratio of the maximum to minimum charge value is outside 1.15, then the battery packs cannot be connected in parallel to output power, that is, the battery packs cannot output power together to provide power to the electric vehicle. Instead, the system continues to determine whether each battery pack has a fault. If it is determined that each battery pack has no fault, the current operating state of each battery pack is maintained. That is, if multiple battery packs are currently connected in parallel to supply power, the multiple battery packs are maintained in parallel mode, and if a single battery pack is currently supplying power, the single battery pack is maintained in single mode. If it is confirmed that each battery pack has a fault, the system will continue to determine which battery pack has caused the fault, and stop supplying power to the battery pack that has caused the fault, and switch to supplying power to the battery pack that has not caused the fault.

[0070] When the electric vehicle is in a riding state, only when it is determined that the voltage difference between the minimum voltage and the maximum voltage of each battery pack is within a second preset value and the ratio of the maximum power to the minimum power of each battery pack is within a third preset value, is it confirmed that the battery pack used to output electric energy is a plurality of parallel battery packs. This is because if the voltage difference between the battery packs is too large and the internal resistance of the battery packs is too small, if the battery packs are output in parallel, it may cause a short circuit in the battery pack, damage the fuse and components in the battery pack, and in severe cases even cause the battery pack to catch fire or explode. And because the electric vehicle is in the riding state, it originally outputs a single battery pack. Under specific operating conditions of the electric vehicle, such as the acceleration condition, the instantaneous current is very large, which may instantly lower the voltage of the battery pack that outputs electrical energy to meet the conditions for parallel packs, thereby making the battery packs output in parallel. However, when the electric vehicle releases the throttle, the voltage of the battery pack that originally outputs electrical energy as a single pack is pulled up again. At this time, the battery packs output in parallel may short-circuit, thereby damaging the fuses and components in the battery pack, and even causing the battery pack to catch fire or explode in severe cases. Therefore, when the electric vehicle is in the riding state, the voltage and power of each battery pack must be within a preset value to meet the conditions for parallel connection of the battery packs.

[0071] The above-mentioned power output control method is mainly applied to electric motorcycles and is continuously executed during the entire operation process of the electric motorcycle, thereby preventing the battery pack from short-circuiting due to improper parallel power output of the battery pack, damaging the fuse and components in the battery pack, and even causing fire and explosion of the battery pack in severe cases. Therefore, the safety of the entire operation process of the electric motorcycle can be guaranteed by this energy output control method.

[0072] Based on the above embodiments, the present application also discloses a battery pack group, which includes multiple battery packs described in the above embodiments, each battery pack is connected in parallel, and the battery pack group uses the power output control method described in the above embodiments to control the output of power.

[0073] Based on the above embodiments, refer to Figure 6As shown, the present application also discloses a power output control device for multiple parallel battery packs, which is applied to an electric vehicle and is used to execute the power output control method described in the above embodiment. The power output control device includes a first judgment unit 100, a second judgment unit 200, a third judgment unit 300, a first confirmation unit 400, a second confirmation unit 500, and a third confirmation unit 600. The first judgment unit 100 is used to confirm whether the multiple parallel battery packs are in a normal communication state; the second judgment unit 200 is used to, upon confirming that the multiple parallel battery packs are in a normal communication state, continue to confirm whether the parameters of each battery pack are normal; the third judgment unit 300 is used to, upon confirming that the parameters of each battery pack are normal, continue to confirm the operating state of the electric vehicle, where the operating state of the electric vehicle includes a locked state, a riding state, and an unlocked state. The first confirmation unit 400 is used to confirm the battery pack used to output electric energy based on the voltage difference of each battery pack when the electric vehicle is in an unlocked state; the second confirmation unit 500 is used to disconnect the communication between each battery pack and confirm one of the battery packs as the battery pack used to output electric energy when the electric vehicle is in a locked state; the third confirmation unit 600 is used to confirm the battery pack used to output electric energy based on the voltage difference and power difference of each battery pack when the electric vehicle is in a riding state.

[0074] Specifically, the first confirmation unit 400 includes a first judgment subunit and a first confirmation subunit. The first judgment subunit is used to judge whether the voltage difference between the minimum voltage and the maximum voltage of each battery pack is within a first preset value; the first confirmation subunit is used to confirm that the battery pack used to output electrical energy is a plurality of parallel battery packs if it is judged that the voltage difference between the minimum voltage and the maximum voltage of each battery pack is within the first preset value; if it is judged that the voltage difference between the minimum voltage and the maximum voltage of each battery pack is outside the first preset value, the battery pack used to output electrical energy is confirmed according to the voltage size of each battery pack, that is, the voltage size of each battery pack is compared, and the battery pack with the largest voltage among the battery packs is confirmed as the battery pack used to output electrical energy.

[0075] The third confirmation unit 600 includes a second judgment subunit and a second confirmation subunit. The second judgment subunit is used to judge whether the voltage difference between the minimum voltage and the maximum voltage of each battery pack is within the second preset value, and whether the ratio of the maximum power value to the minimum power value is within the third preset value; the second confirmation subunit is used to confirm that the battery pack used to output electrical energy is a plurality of parallel battery packs if the voltage difference between the minimum voltage and the maximum voltage of each battery pack is within the second preset value and the ratio of the maximum power value to the minimum power value is within the third preset value; if it is judged that the voltage difference between the minimum voltage and the maximum voltage of each battery pack is outside the second preset value, or the ratio of the maximum power value to the minimum power value of each battery pack is outside the third preset value, the battery pack used to output electrical energy is confirmed according to the fault condition of each battery pack.

[0076] Furthermore, the power output control device also includes a fourth confirmation unit, which is used to confirm the battery pack used to output power based on the address signal of each battery pack when it is determined that multiple parallel battery packs are in an abnormal communication state, that is, to confirm the battery pack whose first output address signal is a high level as the battery pack used to output power.

[0077] Accordingly, the present application also discloses a storage medium, which includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to perform the following steps:

[0078] Determine whether multiple parallel battery packs are in a normal communication state. If the multiple parallel battery packs are in an abnormal communication state, confirm the first battery pack whose output address signal is high as the battery pack for outputting electric energy. If the multiple parallel battery packs are in a normal communication state, continue to determine whether the parameters of each battery pack are normal. If the parameters of each battery pack are abnormal, issue a fault alarm. If the parameters of each battery pack are normal, continue to determine the working state of the electric vehicle, wherein the working state of the electric vehicle includes a locked state, a riding state, and an unlocked state. When the electric vehicle is in an unlocked state, confirm the battery pack for outputting electric energy based on the voltage difference of each battery pack. When the electric vehicle is in a locked state, disconnect the communication of each battery pack, and confirm one of the battery packs as the battery pack for outputting electric energy. When the electric vehicle is in a riding state, confirm the battery pack for outputting electric energy based on the voltage difference and the power difference of each battery pack.

[0079] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for controlling the output of electric energy from multiple parallel battery packs, applied to electric vehicles, characterized in that: include: When the plurality of parallel battery packs are in a normal communication state and the parameters of each battery pack are within a preset parameter range, determining the operating state of the electric vehicle, wherein the operating state of the electric vehicle includes a locked state, a riding state, and an unlocked state; When the electric vehicle is in an unlocked state, determining the battery pack for outputting electric energy according to the voltage difference between the battery packs; When the electric vehicle is in a locked state, disconnecting the communication between the battery packs and identifying one of the battery packs as a battery pack for outputting electric energy; When the electric vehicle is in a riding state, the battery pack for outputting electric energy is determined based on the voltage difference and the power difference of each battery pack.

2. The power output control method according to claim 1, characterized in that: The electric energy output control method further includes: When it is determined that the plurality of parallel battery packs are in an abnormal communication state, the battery pack for outputting electric energy is identified according to the address signals of the battery packs.

3. The power output control method according to claim 2, characterized in that: The step of determining the battery pack for outputting electric energy according to the address signals of the battery packs specifically includes: The first battery pack whose output address signal is high is identified as the battery pack for outputting electric energy.

4. The power output control method according to claim 1, characterized in that: The step of determining the battery pack for outputting electric energy according to the voltage difference between the battery packs specifically includes: Determining whether a voltage difference between a minimum voltage and a maximum voltage of each battery pack is within a first preset value; If it is determined that the voltage difference between the minimum voltage and the maximum voltage of each of the battery packs is within a first preset value, then it is determined that the battery pack for outputting electric energy is a plurality of parallel battery packs; If it is determined that the voltage difference between the minimum voltage and the maximum voltage of each battery pack is outside the first preset value, the battery pack for outputting electric energy is determined based on the voltage of each battery pack.

5. The power output control method according to claim 4, characterized in that: The step of determining the battery pack for outputting electric energy according to the voltage of each battery pack specifically includes: comparing the voltages of the battery packs; The battery pack with the largest voltage among the battery packs is identified as the battery pack for outputting electric energy.

6. The power output control method according to claim 1, characterized in that: The step of determining the battery pack for outputting electric energy based on the voltage difference and the power difference of each battery pack specifically includes: determining whether a voltage difference between a minimum voltage and a maximum voltage of each of the battery packs is within a second preset value; If it is determined that the voltage difference between the minimum voltage and the maximum voltage of each battery pack is within the second preset value, further determining whether the ratio of the maximum power value to the minimum power value in each battery pack is within the third preset value; If it is determined that the ratio of the maximum power value to the minimum power value of each battery pack is within a third preset value, it is confirmed that the battery pack for outputting electric energy is a plurality of parallel battery packs.

7. The power output control method according to claim 6, characterized in that: The electric energy output control method further includes: If it is determined that the voltage difference between the minimum voltage and the maximum voltage of each battery pack is outside the second preset value, or the ratio of the maximum power value to the minimum power value of each battery pack is outside the third preset value, the battery pack used to output electrical energy is confirmed based on the fault condition of each battery pack.

8. A battery pack, characterized in that: The battery pack comprises a plurality of battery packs connected in parallel, wherein the battery pack group controls the output of electric energy by adopting the electric energy output control method according to any one of claims 1 to 7.

9. The battery pack according to claim 8, characterized in that: Each battery pack includes a shell, a battery module, a battery management system, a sampling harness module, an upper cover, a high-voltage socket and a high-voltage plug. The battery module, the battery management system and the sampling harness module are all arranged in the shell, and the battery management system is connected to the battery module assembly via the sampling harness module. The upper cover is covered on the shell, the high-voltage socket is arranged on the upper cover and connected to the battery management system, and the high-voltage plug is connected to the high-voltage socket.

10. The battery pack according to claim 9, characterized in that: The high-voltage socket includes a socket body, which is provided with a signal transmission interface, a discharge total positive interface, a charge total positive interface and a charge and discharge negative interface.

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