WO2024041256A1 - Battery pack connection control method and apparatus, device, and storage medium - Google Patents

Abstract

The present application belongs to the technical field of circuit control. Provided in the present invention are a battery pack connection control method and apparatus, a device, and a storage medium. The method comprises: acquiring battery state information that a communication unit receives from each external battery pack, the battery state information comprising the voltage and maximum safe current; on the basis of the battery state information of each external battery pack and the battery state information of a main battery pack, separately determining whether each external battery pack satisfies conditions for connection; and on the basis of the determination result and the current working state of the main battery pack, connecting each external battery pack to the main battery pack. The present application can improve the adaptability of batteries, allowing batteries to be used in more types of scenarios.

Description

Parallel control method, device, equipment and storage medium of battery pack

Cross-references to related applications

This application claims the priority of the Chinese patent application with application number 202211015679.2 and titled "Battery Pack Parallel Control Method, Device, Equipment and Storage Medium" submitted to the State Intellectual Property Office of China on August 24, 2022, all of which The contents are incorporated into this application by reference.

Technical field

The present application relates to the field of circuit control technology, specifically, to a parallel control method, device, equipment and storage medium for a battery pack.

Background technique

In circuits or electronic devices, batteries are usually required for power supply, and batteries are usually configured based on matching with the circuit or electronic device.

In related technologies, the technical means used are usually to configure battery parameters based on the needs of circuits or electronic devices, so that a single battery that meets the battery parameters is used for power supply.

However, the battery life of a single battery is limited, and solutions using related technologies cannot meet the demand for longer battery life. Moreover, when the needs of circuits or electronic devices change, a single battery may not be able to provide normal power supply. situation, that is to say, the technical means used in related technologies will lead to greater limitations in battery applications and lower adaptability.

Contents of the invention

This application provides a parallel control method, device, equipment and storage medium for a battery pack, which can improve the adaptability of the battery so that the battery can be used in more types of scenarios.

Some embodiments of the present application provide a parallel control method for a battery pack, which method is applied to the battery management unit of the main battery pack of a battery pack system. The battery pack system includes multiple battery packs, and the multiple battery packs include a main battery pack. The battery pack and at least one external battery pack to be connected to the main battery pack, each battery pack includes: a communication unit, a battery management unit, a switch unit, a battery unit, and a charge and discharge unit;

In each battery pack, the battery management unit is connected to the communication unit, switch unit, battery unit and charge and discharge unit respectively, and the battery unit and the charge and discharge unit are connected to each other;

The communication unit of the main battery pack and the communication units of each external battery pack are connected in sequence; the switch unit of the main battery pack and the switch unit of each external battery pack are connected in parallel, and the cell unit of the main battery pack and each external battery pack are connected in parallel. Cell unit connections of the battery pack;

The method includes:

Obtain the battery status information received by the communication unit from each external battery pack. The battery status information includes: voltage and maximum safe current;

Based on the battery status information of each external battery pack and the battery status information of the main battery pack, determine whether each external battery pack meets the parallel conditions;

Based on the determination result and the current working status of the main battery pack, each external battery pack is connected to the main battery pack.

Optionally, based on the determination result and the current working status of the main battery pack, connecting each external battery pack to the main battery pack may include:

If it is determined that the result meets the parallel conditions and the working status of the main battery pack is no charging or discharging, normal loading or normal charging When, the switch unit of the main battery pack is controlled to open, and an instruction is sent to the external battery pack to open the switch unit of the external battery pack, connect the switch units to each other, and connect the battery cell units to each other.

Optionally, based on the determination result and the current working status of the main battery pack, connecting each external battery pack to the main battery pack may include:

If the determination result is that the parallel conditions are not met and the working status of the main battery pack is no charging or discharging, then after the main battery pack enters a new working status of normal loading or normal charging, the battery will be charged according to the new working status of the main battery pack. , connect each external battery pack to the main battery pack.

Optionally, when the new working state of the main battery pack is normal load, the high-voltage battery pack in the main battery pack and the external battery pack is used to power the load until the parallel conditions are met, and the switch unit of the main battery pack is controlled. Open and send instructions to the external battery pack to open the switch unit of the external battery pack, connect the switch units to each other, and connect the battery cell units to each other;

When the new working state of the main battery pack is normal charging, the low-voltage battery pack in the main battery pack and the external battery pack is charged with priority until the parallel conditions are met. The switch unit that controls the main battery pack opens and supplies the power to the external battery. The group sends instructions to open the switch unit of the external battery pack, connect the switch units to each other, and connect the battery cell units to each other.

Optionally, based on the determination result and the current working status of the main battery pack, connecting each external battery pack to the main battery pack may include:

If the determination result is that the parallel conditions are not met, and the working status of the main battery pack is normal loading or normal charging, adjust the voltages of the main battery pack and the external battery pack, and after adjusting the voltage, connect each external battery pack to the main battery pack. Battery pack connection.

Optionally, determining whether each external battery pack meets the parallel conditions based on the battery status information of each external battery pack and the battery status information of the main battery pack may include:

Determine the target parallel method;

Based on the battery status information of each external battery pack and the battery status information of the main battery pack, it is determined whether each external battery pack meets the parallel conditions corresponding to the target parallel mode.

Optionally, the target parallel mode is: parallel mode; based on the battery status information of each external battery pack and the battery status information of the main battery pack, it is determined whether each external battery pack meets the parallel conditions corresponding to the target parallel mode, including:

Determine the voltage difference between the main battery pack and the external battery pack;

Determine the circulating current generated by parallel connection based on the voltage difference and the nominal impedance of the battery pack;

Determine whether the generated circulating current is less than the maximum safe current of the external battery pack and the maximum safe current of the main battery pack;

If yes, determine that the external battery pack meets the parallel conditions; if not, determine that the external battery pack does not meet the parallel conditions.

Optionally, the target parallel mode is a series mode; based on the battery status information of each external battery pack and the battery status information of the main battery pack, it is determined whether each external battery pack meets the parallel conditions corresponding to the target parallel mode, which may include:

Determine the voltage difference between the main battery pack and the external battery pack;

Compare the relationship between the voltage difference and the voltage difference threshold;

If the voltage difference is less than the voltage difference threshold, it is determined that the external battery pack meets the parallel conditions;

If the voltage difference is greater than or equal to the voltage difference threshold, it is determined that the external battery pack does not meet the parallel conditions.

Optionally, before obtaining the battery status information of the target battery pack, the method may also include:

Scan through the communication unit to see if there is an external battery pack to be connected;

If so, assign addresses to each external battery pack and determine the order of each external battery pack.

Optionally, before obtaining the battery status information received by the communication unit from each external battery pack, it also includes:

The battery management unit of each battery pack in the battery pack system determines the battery level based on the level signal of the external interface of the communication unit. Whether the battery pack acts as the main battery pack.

Optionally, the communication unit of each battery pack includes an external interface;

The external interface of the communication unit of the main battery pack is connected to the external interface of the first external battery pack communication unit among the plurality of external battery packs; starting from the communication unit of the first external battery pack, each of the multiple external battery packs The communication units of the external battery packs are connected in series in sequence according to the order of each external battery pack.

Optionally, each battery pack may also include: a two-way electrical unit;

In each battery pack, the bidirectional electrical unit is connected to the switch unit, charge and discharge unit, and battery unit respectively; the bidirectional electrical unit is used to implement charging or discharging functions according to the working status of the battery pack.

Other embodiments of the present application provide a parallel control device for a battery pack, which device is applied to the battery management unit of the main battery pack of a battery pack system. The battery pack system includes multiple battery packs, and the multiple battery packs include The main battery pack and at least one external battery pack to be connected to the main battery pack. Each battery pack includes: a communication unit, a battery management unit, a switch unit, a battery unit, and a charge and discharge unit; in each battery pack, the battery management unit is connected to The communication unit, the switch unit, the battery unit and the charge and discharge unit are connected, and the battery unit and the charge and discharge unit are connected; the communication unit of the main battery pack and the communication units of each external battery pack are connected in sequence; The switch unit and the switch unit of each external battery pack are connected in parallel, and the cell unit of the main battery pack is connected to the cell unit of each external battery pack; the device includes: an acquisition module, a determination module and a connection module;

The acquisition module is configured to acquire battery status information received by the communication unit from each external battery pack. The battery status information includes: voltage and maximum safe current;

The determination module is configured to respectively determine whether each external battery pack meets the parallel condition based on the battery status information of each external battery pack and the battery status information of the main battery pack;

The connection module is configured to connect each external battery pack to the main battery pack based on the determination result and the current operating status of the main battery pack.

Optionally, the connection module can be configured to control the switch unit of the main battery pack to open and connect the main battery pack to the outside when the determination result meets the parallel conditions and the working status of the main battery pack is no charging or discharging, normal loading or normal charging. The battery pack sends instructions to open the switch unit of the external battery pack, connect the switch units to each other, and connect the battery cell units to each other.

Optionally, the connection module may be configured to, when the determination result is that the parallel conditions are not met and the working state of the main battery pack is no charging or discharging, after the main battery pack enters a new working state of normal loading or normal charging. , connect each external battery pack to the main battery pack according to the new working status of the main battery pack.

Optionally, the connection module can be configured to: when the new working state of the main battery pack is normal load, let the high-voltage battery pack in the main battery pack and the external battery pack power the load until the parallel conditions are met, Control the switch unit of the main battery pack to open, and send instructions to the external battery pack to open the switch unit of the external battery pack, connect the switch units to each other, and connect the battery cells to each other; when the new working state of the main battery pack When charging normally, the low-voltage battery pack in the main battery pack and the external battery pack is charged with priority until the parallel conditions are met, the switch unit of the main battery pack is controlled to open, and an instruction is sent to the external battery pack so that the external battery The switch unit of the group is turned on, the switch units are connected to each other, and the battery cell units are connected to each other.

Optionally, the connection module can be configured to: when the determination result is that the parallel conditions are not met and the working status of the main battery pack is normal loading or normal charging, adjust the voltage of the main battery pack and the external battery pack, and After adjusting the voltage, connect each external battery pack to the main battery pack.

Optionally, the determination module may be configured to: determine the target parallel mode; determine whether each external battery pack meets the parallel requirements corresponding to the target parallel mode based on the battery status information of each external battery pack and the battery status information of the main battery pack. condition.

Optionally, when the target parallel mode is parallel mode, the determination module can be configured to: determine the voltage difference between the main battery pack and the external battery pack; determine the circulating current generated by the parallel connection based on the voltage difference and the nominal impedance of the battery pack; Determine whether the generated circulating current is less than the maximum safe current of the external battery pack and the maximum safe current of the main battery pack; if so, determine that the external battery pack meets the parallel conditions; if not, determine that the external battery pack does not meet the parallel conditions.

Optionally, when the target parallel mode is series mode, the determination module can be configured to: determine the voltage difference between the main battery pack and the external battery pack; compare the voltage difference with the voltage difference threshold; if the voltage difference is less than The voltage difference threshold determines that the external battery pack meets the parallel conditions; if the voltage difference is greater than or equal to the voltage difference threshold, it is determined that the external battery pack does not meet the parallel conditions.

Optionally, the determination module can also be configured to: scan through the communication unit whether there is an external battery pack to be connected; if so, allocate addresses to each external battery pack and determine the order of each external battery pack.

Optionally, the determination module may also be configured to determine whether the battery pack serves as the main battery pack according to the level signal of the external interface of the communication unit.

Still other embodiments of the present application provide a computer device. The computer device includes: a memory and a processor. The memory stores a computer program that can be run on the processor. When the processor executes the computer program, it realizes the parallelization of the battery pack. The steps of the machine control method.

Still other embodiments of the present application provide a computer-readable storage medium. A computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the parallel control method of the battery pack are implemented.

The beneficial effects of the embodiments of this application at least include:

In the parallel control method, device, equipment and storage medium of a battery pack provided by embodiments of the present application, the battery status information received by the communication unit from each external battery pack can be obtained, and based on the battery status information of each external battery pack The battery status information of the main battery pack and the battery status information of each external battery pack respectively determine whether each external battery pack meets the parallel conditions; and then based on the determination results and the current working status of the main battery pack, each external battery pack can be connected to the main battery pack, that is to say, The battery life can be increased by connecting each external battery pack in series or parallel with the main battery pack, and when the actual power supply demand changes, other external battery packs can be connected in parallel or in series. Changes in the power supply method can improve the adaptability of the battery so that the battery can be used in more types of scenarios.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a battery pack system provided by an embodiment of the present application;

Figure 2 is a schematic flowchart of a parallel control method for a battery pack provided by an embodiment of the present application;

Figure 3 is another schematic flowchart of a parallel control method for a battery pack provided by an embodiment of the present application;

Figure 4 is another schematic flowchart of the parallel control method of the battery pack provided by the embodiment of the present application;

Figure 5 is another schematic flowchart of the parallel control method of the battery pack provided by the embodiment of the present application;

Figure 6 is yet another schematic flowchart of the parallel control method of the battery pack provided by the embodiment of the present application;

Figure 7 is another structural schematic diagram of the battery pack system provided by the embodiment of the present application;

Figure 8 is another structural schematic diagram of the battery pack system provided by the embodiment of the present application;

Figure 9 is a schematic structural diagram of a parallel control device for a battery pack provided by an embodiment of the present application;

Figure 10 is a schematic structural diagram of a computer device provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the application provided in the appended drawings is not intended to limit the scope of the claimed application, but rather to represent selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

It should be noted that similar reference numerals and letters represent similar items in the following figures, therefore, once an item is defined in one figure, it does not need further definition and explanation in subsequent figures.

In the description of the present application, it should be noted that the terms "first", "second", "third", etc. are only used to differentiate the description and cannot be understood as indicating or implying relative importance.

The specific structure and connection relationship of the battery pack system involved in the embodiment of the present application will be explained in detail below.

Figure 1 is a schematic structural diagram of a battery pack system provided by an embodiment of the present application. Please refer to Figure 1. The battery pack system includes multiple battery packs. The multiple battery packs include a main battery pack 110 and at least one battery pack to be connected to the main battery pack. An external battery pack 120 is provided. Each battery pack includes: a communication unit 101, a battery management unit 102, a switch unit 103, a battery unit 104, and a charging and discharging unit 105.

Optionally, the battery pack system may include multiple battery packs, and these battery packs may be pre-connected in hardware, but switches will be used to keep each battery pack unconnected in the initial state, where the main battery The structure of the pack 110 and each external battery pack 120 are the same and include the above-mentioned units.

For each battery pack, the battery management unit 102 is connected to the communication unit 101, the switch unit 103, the battery unit 104 and the charging and discharging unit 105 respectively, and the battery unit 104 and the charging and discharging unit 105 are connected to each other.

Among them, the communication unit 101 can be any type of chip with communication functions, and can send relevant information to other communication units 101 or receive relevant information from other communication units 101. During the specific implementation process, the communication unit can use wired communication. communication, or wireless communication. In Figure 1, wired communication is used as an example.

The battery management unit 102 can be a controller of the battery pack, for example, it can be any type of control chip such as a micro control unit or a central controller. There is no specific limitation here, as long as it can control other units. Specifically, the switch unit 103 can be controlled to turn on or off the switch unit; the charge and discharge unit 105 can be controlled to charge or discharge the battery cell unit 104, and the charge and discharge unit 105 can be controlled to charge or discharge the battery cell unit 104. The control of the discharge unit 105 realizes the protection of the battery unit 104, such as overcurrent protection, short circuit protection, overvoltage and undervoltage protection, high and low temperature protection, equalization protection, etc., which are not specifically limited here.

The switch unit 103 can be a software switch (implemented through a program) or a hardware switch (implemented through physical opening and closing). There is no specific limitation here. It can be turned on or off under the control of the battery management unit 102 .

The battery cell unit 104 can serve as the negative terminal of the battery, and can be charged or discharged through the charging and discharging unit 105 .

The charging and discharging unit 105 can charge or discharge the battery unit 104 under the control of the battery management unit 102 .

The communication unit 101 of the main battery pack 110 and the communication units 101 of each external battery pack 120 are connected in sequence; The switch unit 103 of the main battery pack 110 and the switch unit 103 of each external battery pack 120 are connected in parallel, and the cell unit 104 of the main battery pack 110 is connected to the cell unit 104 of each external battery pack 120 .

Optionally, FIG. 1 takes a main battery pack 110 and an external battery pack 120 as an example for explanation. When there are multiple external battery packs 120, they can be connected to the main battery pack 110 respectively.

The connection relationship of the communication unit 101 can be a communication connection that is always maintained, and communication can be achieved regardless of whether the external battery pack 120 is connected to the main battery pack.

When the main battery pack 110 is connected to the external battery pack 120, the positive terminal connection can be realized through the parallel connection between the switch units 103, and the negative terminal connection can be realized through the connection between the cell units 104, thereby realizing the main battery pack 110 Connection to external battery pack.

It should be noted that the negative terminals (that is, between the cell units 104) can maintain a normal connection, and the positive terminals (that is, between the switch units 103) can be disconnected under normal circumstances. state, when it is determined that the two can be connected, the switch can be adjusted to the on state, thereby realizing the connection between the battery packs.

The specific implementation process of the parallel control method of the battery pack provided in the embodiment of the present application is explained below based on the specific structure of the above-mentioned battery pack system.

Figure 2 is a schematic flowchart of a parallel control method for a battery pack provided by an embodiment of the present application. Please refer to Figure 2. The method includes:

S210: Obtain the battery status information received by the communication unit from each external battery pack.

Among them, the battery status information includes: voltage and maximum safe current.

Optionally, the execution subject of the method may be the battery management unit of the main battery pack in the above battery pack system.

It should be noted that the communication unit may obtain the battery status information of any external battery pack by communicating with the communication unit of the external battery pack. Specifically, it can be actively sent by the external battery pack through its communication unit, or it can be obtained by the main battery pack by sending instructions. There is no specific limitation here.

In the battery status information, the voltage may specifically be the working voltage of the external battery pack, and the maximum safe current may be the maximum safe current that the external battery pack can withstand during operation.

Optionally, the battery status information of the main battery pack can be stored in the battery management unit of the main battery pack in advance; accordingly, the battery status information of the external battery pack can be stored in the battery management unit of the external battery pack in advance. , when transmission is required, it can be sent by the battery management unit to the communication unit to implement transmission.

S220: Determine whether each external battery pack meets the parallel conditions based on the battery status information of each external battery pack and the battery status information of the main battery pack.

Optionally, after the communication unit obtains the battery status information of each external battery pack, it can send the battery status information to the battery management unit of the main battery pack, and then the battery management unit of the main battery pack can The battery status information and the battery status information of the main battery pack respectively determine whether each external battery pack meets the parallel conditions.

It should be noted that for multiple external battery packs, each battery pack can be processed in sequence. That is to say, after receiving the battery status information of an external battery pack, based on the status information of the external battery pack and The status information of the main battery pack is used to determine whether the external battery pack meets the parallel conditions.

Among them, the parallel condition specifically refers to the condition for the main battery pack and the external battery pack to be connected in parallel. When implemented, it can be a parallel connection condition or a series connection condition. The specific connection relationship can be determined according to the actual needs. , there is no restriction here.

S230: Based on the determination result and the current working status of the main battery pack, connect each external battery pack to the main battery pack.

Among them, the determination result may be that the parallel conditions are met or the parallel conditions are not met. The current working status of the main battery pack The status may include no charging or discharging status, normal loading status or normal charging status.

Specifically, the non-charging and discharging state can be when the main battery pack is not working, that is, there is no charging or power supply process; the normal loading state can be when the main battery pack is supplying power to the load, and at this time the main battery The pack is discharged; the normal charging state may be the state in which the main battery pack is being charged.

Optionally, after obtaining the determination result and the current working status of the main battery pack, different steps can be performed based on different situations to connect the external battery pack to the main battery pack.

In the parallel control method of a battery pack provided by an embodiment of the present application, the battery status information received by the communication unit from each external battery pack can be obtained, and the battery status information of each external battery pack and the battery status of the main battery pack can be obtained. The information determines whether each external battery pack meets the parallel conditions; then, based on the determination results and the current working status of the main battery pack, each external battery pack can be connected to the main battery pack. That is to say, each external battery pack can be connected by It can be connected in series or parallel with the main battery pack to increase the battery life. Moreover, when the actual power supply demand changes, the battery power supply mode can be changed by connecting other external battery packs in parallel or series, so that the battery power supply mode can be changed. Improve the adaptability of the battery so that the battery can be used in more types of scenarios.

The following explains how to connect the external battery pack to the main battery pack under different circumstances:

(1) If the determined result meets the parallel conditions and the working status of the main battery pack is no charging or discharging, normal loading or normal charging.

Specifically, if the determination result meets the parallel conditions and the working status of the main battery pack is no charging or discharging, normal loading or normal charging, the switch unit that controls the main battery pack is turned on and sends instructions to the external battery pack to enable The switch unit of the external battery pack is turned on, the switch units are connected, and the battery cell units are connected.

That is to say, when the parallel conditions are met, no matter what the working status of the main battery pack is, it can be connected normally, as follows:

The battery management unit of the main battery pack and the battery management unit of the external battery pack respectively control and open their respective switch units to complete parallel connection. At this time, the negative terminals (cell units) of each battery group are connected together, and the positive terminals of each battery group are connected together through the switch unit and the parallel machine to realize the connection.

Specifically, under normal load conditions, the main battery pack can be expanded without stopping by connecting to other external battery packs. The maximum power of this expansion is the sum of the power of the main battery pack and each external battery pack. At the same time, Removing or adding an external battery pack will not cause the main battery pack to stop output, and each external battery pack can also achieve its own load by controlling the charge and discharge unit. If the load of the external battery pack exceeds the power of its own single battery pack, it can also be controlled by The connection method achieves the acquisition of additional power for loading.

(2) If the determination result is that the parallel conditions are not met, and the working status of the main battery pack is no charging or discharging.

Specifically, if the determination result is that the parallel conditions are not met and the working status of the main battery pack is no charging or discharging, after the main battery pack enters a new working status of normal loading or normal charging, the main battery pack will be charged according to the new working status of the main battery pack. In the working state, connect each external battery pack to the main battery pack.

Correspondingly, when the new working state of the main battery pack is normal load, the high-voltage battery pack in the main battery pack and the external battery pack is allowed to power the load until the parallel conditions are met, and the switch unit controlling the main battery pack is turned on. , and sends instructions to the external battery pack to open the switch unit of the external battery pack, connect each switch unit, and connect each cell unit; when the new working state of the main battery pack is normal charging, make the main battery The low-voltage battery pack in the main battery pack and the external battery pack are charged with priority until the parallel conditions are met. The switch unit of the main battery pack is controlled to open and an instruction is sent to the external battery pack to open the switch unit of the external battery pack. Each switch The units are connected to each other, and the battery cells are connected to each other.

Among them, after entering the normal loading state, the battery pack with higher voltage among the main battery pack and the external battery pack can be used as the load for loading. For example: if the voltage of the main battery pack is higher, you can first let The main battery pack is loaded until the main battery pack is discharged and meets the above parallel conditions, then the parallel connection can be achieved in the same way as above.

After entering the normal charging state, you can use the battery pack with a lower voltage among the main battery pack and the external battery pack to be charged separately. For example: if the voltage of the main battery pack is low, you can let the main battery pack charge first. Charging, until during the charging process, the main battery pack meets the aforementioned parallel conditions after charging, then the parallel connection can be achieved in the same way as above.

(3) If the determination result is that the parallel conditions are not met, and the working status of the main battery pack is normal loading or normal charging.

If the determination result is that the parallel conditions are not met, and the working status of the main battery pack is normal loading or normal charging, adjust the voltages of the main battery pack and the external battery pack, and after adjusting the voltage, connect each external battery pack to the main battery pack. Battery pack connection.

It should be noted that the steps performed in this case are the same as those in case (2) when the new working state is normal loading or when the new working state is normal charging, and will not be described again.

The specific implementation process of determining whether the parallel conditions are met in the embodiment of the present application will be explained in detail below.

Figure 3 is another schematic flowchart of the parallel control method of the battery pack provided by the embodiment of the present application. Please refer to Figure 3 to determine each external battery pack based on the battery status information of each external battery pack and the battery status information of the main battery pack. Whether parallel conditions are met, including:

S310: Determine the target parallel mode.

Optionally, the target parallel mode may specifically be a parallel connection mode, for example, it may be a parallel mode or a series mode.

It should be noted that the specific target parallel mode may be determined based on human selection or pre-configuration.

S320: Based on the battery status information of each external battery pack and the battery status information of the main battery pack, determine whether each external battery pack meets the parallel conditions corresponding to the target parallel mode.

Optionally, after obtaining the target parallel mode, it can be determined based on the battery status information of each external battery pack and the battery status information of the main battery pack whether each external battery pack meets the parallel conditions corresponding to the target parallel mode. For different The target parallel mode can be configured with different parallel conditions.

The following is a detailed explanation of how to achieve the specific implementation process of determining parallel conditions based on the situation that the target parallel mode is parallel mode.

Figure 4 is another schematic flow chart of the parallel control method of the battery pack provided by the embodiment of the present application. Please refer to Figure 4. The target parallel mode is: parallel mode; based on the battery status information of each external battery pack and the main battery pack The battery status information determines whether each external battery pack meets the parallel conditions corresponding to the target parallel mode, including:

S410: Determine the voltage difference between the main battery pack and the external battery pack.

Optionally, when the main battery pack and the external battery pack are connected in parallel, the voltage difference between the main battery pack and the external battery pack can be determined based on the battery status information of the external battery pack and the battery status information of the main battery pack. voltage to determine.

Among them, the voltage of the main battery pack is U1, and the voltage of the external battery pack is U2, then the voltage difference U=|U1-U2|.

S420: Determine the circulating current generated by parallel connection based on the voltage difference and the nominal impedance of the battery pack.

The specific calculation formula is as follows:

I=U/z;

Where I is the circulating current generated by parallel connection, and z is the nominal impedance of the battery pack.

S430: Determine whether the generated circulating current is less than the maximum safe current of the external battery pack and the maximum safe current of the main battery pack.

Optionally, after the circulating current I is calculated through the above calculation, it can be determined by the maximum safe current I1 of the main battery pack and the maximum safe current I2 of the external battery pack.

If yes, S440: Make sure the external battery pack meets the parallel conditions.

If not, S450: Determine that the external battery pack does not meet the parallel conditions.

Specifically, if I<I1, and I<I2, it can be determined that the external battery pack meets the parallel conditions; conversely, if I≥I1, or I≥I2, it can be determined that the external battery pack does not meet the parallel conditions. .

The following is a detailed explanation of how to achieve the specific implementation process of determining the parallel conditions based on the situation that the target parallel mode is a series mode.

Figure 5 is another schematic flowchart of the parallel control method of the battery pack provided by the embodiment of the present application. Please refer to Figure 5. The target parallel mode is the series mode; based on the battery status information of each external battery pack and the battery status of the main battery pack The status information determines whether each external battery pack meets the parallel conditions corresponding to the target parallel mode, including:

S510: Determine the voltage difference between the main battery pack and the external battery pack.

Optionally, when the main battery pack and the external battery pack are connected in series, the voltage difference between the main battery pack and the external battery pack can be determined based on the battery status information of the external battery pack and the battery status information of the main battery pack. voltage to determine.

The calculation process of the voltage difference is the same as the calculation process of the aforementioned parallel relationship, and will not be explained again here.

S520: Compare the relationship between the voltage difference and the voltage difference threshold.

Optionally, the voltage difference threshold may be a preconfigured threshold, for example, it may be the breakdown voltage of a switching tube in a switching unit that switches in parallel mode, or it may be the breakdown voltage of internal components of the main battery pack or an external battery pack. voltage, etc. In actual use, in order to avoid breakdown, the voltage difference threshold can also be set smaller than the breakdown voltage.

After the voltage difference is obtained, the relationship between the voltage difference and the voltage difference threshold can be compared, that is, the voltage values corresponding to the two can be compared.

S530: If the voltage difference is less than the voltage difference threshold, it is determined that the external battery pack meets the parallel conditions.

S540: If the voltage difference is greater than or equal to the voltage difference threshold, it is determined that the external battery pack does not meet the parallel conditions.

Optionally, when the voltage difference is less than the voltage difference threshold, it can be determined that the external battery pack meets the parallel conditions; when the voltage difference is greater than or equal to the voltage difference threshold, it can be determined that the external battery pack does not meet the parallel conditions.

Optionally, in the case of series connection, if the parallel conditions are not met, the external battery pack can be used to power the load, and the main battery pack will stop supplying power, which in turn can reduce the voltage of the external battery pack until the parallel conditions are met.

It should be noted that if the relationship is in series, after the conditions for parallel operation are met, the external battery pack under parallel operation still needs to be monitored, as follows:

If the external battery pack is in a discharge (load) state, the main battery pack can obtain the charge status of the external battery pack through the communication unit, and can detect its own charge status in real time. When the charge status of the main battery pack or the charge of the external battery pack When the status returns to zero, the parallel connection to the external battery pack can be released.

If the external battery pack is charging, the main battery pack can obtain the charge status and voltage of the external battery pack through the communication unit, and can detect its own charge status and voltage in real time. When the charge status of the main battery pack or the external battery pack When the charge status is full, the parallel connection to the external battery pack can be released. In addition, if the voltage difference between the main battery pack and the external battery pack reaches the aforementioned voltage difference threshold, you can also cancel the parallel operation of the external battery pack, then charge and fully charge the main battery pack first, and switch after the main battery pack is full. Charge the external battery pack until it is fully charged.

Another specific implementation process of the parallel control method of the battery pack provided by the embodiment of the present application will be explained in detail below.

Figure 6 is yet another schematic flowchart of the parallel control method of a battery pack provided by an embodiment of the present application. Please refer to Figure 6. Before obtaining the battery status information of the target battery pack, the method also includes:

S610: Scan through the communication unit whether there is an external battery pack to be connected.

Optionally, when an external battery pack is about to be connected, communication can be performed through the communication unit, and the battery management unit can scan through the communication unit to determine whether there is an external battery pack to be connected.

S620: If yes, allocate addresses to each external battery pack and determine the order of each external battery pack.

Optionally, after it is determined that there is an external battery pack, addresses can be allocated to multiple external battery packs respectively, and an order can be determined, based on which the external battery packs can be connected to the main battery pack in turn.

In contrast, if there is no external battery pack, address allocation does not need to be performed.

Optionally, before obtaining the battery status information received by the communication unit from each external battery pack, it also includes: the battery management unit of each battery pack in the battery pack system determines whether the battery pack serves as the master according to the level signal of the external interface of the communication unit. Battery.

Optionally, the main battery pack and the external battery pack are not fixed. In the actual determination process, it can be determined whether the battery pack serves as the main battery pack according to the level signal of the external interface of the communication unit. For example: for the first The battery pack and the second battery pack can determine the level signal of the external interface of the first battery pack and the level signal of the external interface of the second battery pack, use the low level signal as the external battery pack, and use the high level signal as the external battery pack. As the main battery pack, each time the battery pack is connected, the above determination can be made to determine the main battery pack.

The specific structural relationship of the communication units of each battery pack provided in the embodiment of the present application will be explained in detail below.

Figure 7 is another structural schematic diagram of the battery pack system provided by the embodiment of the present application. Please refer to Figure 7. The communication unit of each battery pack includes an external interface; the external interface of the communication unit of the main battery pack is connected to the communication unit of the multiple external battery packs. The external interface of the first external battery pack communication unit is connected; starting from the communication unit of the first external battery pack, the communication units of each of the multiple external battery packs are connected in series in sequence according to the order of each external battery pack.

Wherein, the external interface of the communication unit of the main battery pack may be (a) in Figure 7 , and the external interface of the communication unit of the external battery pack may be (b) and (c) in Figure 7 , wherein, in Figure 7 , Three battery packs are taken as an example. In actual implementation, there may be two or more battery packs, and there is no limitation here.

Specifically, the external interfaces (b) and (c) of the communication units based on different external battery packs in Figure 7 may be two external interfaces arranged in sequence according to the order of their corresponding external battery packs.

Another specific structural relationship of the battery pack provided in the embodiment of the present application will be explained in detail below.

Figure 8 is another structural schematic diagram of the battery pack system provided by the embodiment of the present application. Please refer to Figure 8. Each battery pack also includes: a bidirectional electrical unit 106; in each battery pack, the bidirectional electrical unit 106 is connected to the switch unit 103, the charging unit 106 and the switch unit 103 respectively. The discharge unit 105 and the battery cell unit 104 are connected; the bidirectional electrical unit 106 is used to implement charging or discharging functions according to the working status of the battery pack.

Optionally, when the working state of the battery pack is no charging or discharging, the two-way electrical unit 106 does not work; when the working state of the battery pack is normal loading, the two-way electrical unit 106 can be used as a load; when the working state of the battery pack is During normal charging, the two-way electrical unit 106 can serve as a power source.

The following describes the devices, equipment and storage media corresponding to the battery pack parallel control method provided in the present application. The specific implementation process and technical effects are as mentioned above, and will not be described in detail below.

Figure 9 is a schematic structural diagram of a parallel control device for a battery pack provided by an embodiment of the present application. Please refer to Figure 9 . The device includes: an acquisition module 910, a determination module 920, and a connection module 930;

The acquisition module 910 may be configured to acquire battery status information received by the communication unit from each external battery pack. The battery status information includes: voltage, maximum safe current;

The determination module 920 may be configured to respectively determine whether each external battery pack meets the parallel condition based on the battery status information of each external battery pack and the battery status information of the main battery pack;

The connection module 930 may be configured to connect each external battery pack to the main battery pack based on the determination result and the current working status of the main battery pack.

Optionally, the connection module 930 may be configured to control the switch unit of the main battery pack to open and provide the power when the determination result meets the parallel conditions and the working status of the main battery pack is no charging or discharging, normal loading or normal charging. The external battery pack sends instructions to open the switch unit of the external battery pack, connect the switch units to each other, and connect the battery cell units to each other.

Optionally, the connection module 930 may be configured to, when the determination result is that the parallel conditions are not met and the working state of the main battery pack is no charging or discharging, the main battery pack enters a new working state of normal loading or normal charging. Finally, connect each external battery pack to the main battery pack according to the new working status of the main battery pack.

Optionally, the connection module 930 can be configured to enable the high-voltage battery pack in the main battery pack and the external battery pack to power the load when the new working state of the main battery pack is normal loading, until the parallel conditions are met. Control the switch unit of the main battery pack to open, and send instructions to the external battery pack to open the switch unit of the external battery pack, connect the switch units to each other, and connect the battery cells to each other; when the new working state of the main battery pack When charging normally, the low-voltage battery pack in the main battery pack and the external battery pack is charged with priority until the parallel conditions are met, the switch unit of the main battery pack is controlled to open, and an instruction is sent to the external battery pack so that the external battery The switch unit of the group is turned on, the switch units are connected to each other, and the battery cell units are connected to each other.

Optionally, the connection module 930 may be configured to adjust the voltages of the main battery pack and the external battery pack when the determination result is that the parallel conditions are not met and the working status of the main battery pack is normal loading or normal charging, and After adjusting the voltage, connect each external battery pack to the main battery pack.

Optionally, the determination module may be configured to determine the target parallel mode; determine whether each external battery pack meets the parallel conditions corresponding to the target parallel mode based on the battery status information of each external battery pack and the battery status information of the main battery pack. .

Optionally, when the target parallel mode is a parallel mode, the determination module 920 may be configured to determine the voltage difference between the main battery pack and the external battery pack; determine the circulating current generated by the parallel connection based on the voltage difference and the nominal impedance of the battery pack; Determine whether the generated circulating current is less than the maximum safe current of the external battery pack and the maximum safe current of the main battery pack; if so, determine that the external battery pack meets the parallel conditions; if not, determine that the external battery pack does not meet the parallel conditions.

Optionally, when the target parallel mode is the series mode, the determination module 920 may be configured to determine the voltage difference between the main battery pack and the external battery pack; compare the voltage difference with the voltage difference threshold; if the voltage difference is less than The voltage difference threshold determines that the external battery pack meets the parallel conditions; if the voltage difference is greater than or equal to the voltage difference threshold, it is determined that the external battery pack does not meet the parallel conditions.

Optionally, the determination module 920 may also be configured to scan through the communication unit whether there is an external battery pack to be connected; if so, perform address assignment to each external battery pack and determine the order of each external battery pack.

Optionally, the determination module 920 may also be configured to determine whether the battery pack serves as the main battery pack according to the level signal of the external interface of the communication unit.

In the parallel control device of a battery pack provided by an embodiment of the present application, the battery status information received by the communication unit from each external battery pack can be obtained, and the battery status information of each external battery pack and the battery status of the main battery pack can be obtained. The information determines whether each external battery pack meets the parallel conditions; and then based on the determination results and the current situation of the main battery pack In the current working state, connect each external battery pack to the main battery pack, that is to say, you can increase the battery life by connecting each external battery pack and the main battery pack in series or parallel, and you can also When the actual power supply demand changes, the battery power supply mode can be changed by connecting other external battery packs in parallel or in series, thereby improving the adaptability of the battery so that the battery can be used in more types of scenarios.

The above device is used to execute the method provided in the foregoing embodiments. Its implementation principles and technical effects are similar and will not be described again here.

The above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more application specific integrated circuits (ASIC for short), or one or more microprocessors, or, One or more Field Programmable Gate Array (FPGA for short), etc. For another example, when one of the above modules is implemented in the form of a processing element scheduler code, the processing element can be a general-purpose processor, such as a central processing unit (Central Processing Unit, CPU for short) or other processors that can call program code. For another example, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).

Figure 10 is a schematic structural diagram of a computer device provided by an embodiment of the present application. Please refer to Figure 10. Other embodiments of the present application provide a computer device. The computer device may include: a memory 940, a processor 950, and a memory 940. A computer program that can be run on the processor 950 is stored. When the processor 950 executes the computer program, the steps of the parallel control method of the battery pack are implemented.

Optionally, the computer device may be a battery management unit of the main battery pack in the battery pack system.

Still other embodiments of the present application further provide a computer-readable storage medium. A computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the parallel control method of the battery pack are implemented.

In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated. to another system, or some features can be ignored, or not implemented. On the other hand, the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.

A unit described as a separate component may or may not be physically separate. A component shown as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium and includes a number of instructions to cause a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to execute the methods of various embodiments of the present application. Some steps. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (English: Read-Only Memory, abbreviation: ROM), random access memory (English: Random Access Memory, abbreviation: RAM), magnetic disk or optical disk, etc. Various media that can store program code.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, and they should be covered by this application within the scope of protection. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

The above descriptions are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the protection scope of this application.

Industrial applicability

This application provides a parallel control method, device, equipment and storage medium for a battery pack, belonging to the field of circuit control technology. The method includes: obtaining battery status information received by the communication unit from each external battery pack, the battery status information includes: voltage, maximum safe current; determining each external battery based on the battery status information of each external battery pack and the battery status information of the main battery pack. Whether the battery pack meets the parallel conditions; based on the determination result and the current working status of the main battery pack, connect each external battery pack to the main battery pack. This application can improve the adaptability of the battery so that the battery can be used in more types of scenarios.

In addition, it can be understood that the parallel control method, device, equipment and storage medium of the battery pack of the present application are reproducible and can be used in a variety of industrial applications. For example, the battery pack parallel control method, device, equipment and storage medium of the present application can be used in the field of circuit control technology.

Claims (20)

1. A parallel control method for a battery pack, wherein the method is applied to a battery management unit of a main battery pack of a battery pack system, the battery pack system includes multiple battery packs, and the multiple battery packs include a main battery The battery pack and at least one external battery pack to be connected to the main battery pack, each of the battery packs includes: a communication unit, a battery management unit, a switch unit, a battery unit, and a charge and discharge unit;

   In each of the battery packs, the battery management unit is respectively connected to the communication unit, the switch unit, the battery unit and the charge and discharge unit, and there is a gap between the battery unit and the charge and discharge unit. connect;

   The communication unit of the main battery pack and the communication units of each external battery pack are connected in sequence; the switch unit of the main battery pack and the switch unit of each external battery pack are connected in parallel, and the switch unit of the main battery pack is connected in parallel. The battery unit is connected to the battery unit of each external battery pack;

   The methods include:

   Obtain battery status information received by the communication unit from each external battery pack, where the battery status information includes: voltage and maximum safe current;

   Determine whether each of the external battery packs meets the parallel conditions based on the battery status information of each of the external battery packs and the battery status information of the main battery pack respectively;

   Based on the determination result and the current working status of the main battery pack, each external battery pack is connected to the main battery pack.
2. The parallel control method of a battery pack according to claim 1, wherein connecting each external battery pack to the main battery pack based on the determination result and the current working state of the main battery pack includes:

   If the determination result satisfies the parallel conditions and the working status of the main battery pack is no charging or discharging, normal loading or normal charging, the switch unit of the main battery pack is controlled to open, and the power supply to the external battery pack is Send an instruction to open the switch unit of the external battery pack, connect the switch units to each other, and connect the battery cell units to each other.
3. The parallel control method of a battery pack according to claim 1, wherein connecting each external battery pack to the main battery pack based on the determination result and the current working state of the main battery pack includes:

   If the determination result is that the parallel conditions are not met and the working state of the main battery pack is no charging or discharging, then after the main battery pack enters a new working state of normal loading or normal charging, according to the Describe the new working state of the main battery pack, and connect each external battery pack to the main battery pack.
4. The parallel control method of a battery pack according to claim 3, wherein the connecting each external battery pack to the main battery pack according to the new working state of the main battery pack includes:

   When the new working state of the main battery pack is normal loading, the main battery pack and the high-voltage battery pack in the external battery pack are allowed to supply power to the load until the parallel conditions are met, and the main battery pack is controlled to The switch unit of the battery pack is turned on, and sending instructions to the external battery pack to open the switch unit of the external battery pack, connect the switch units to each other, and connect the battery cell units to each other;

   When the new working state of the main battery pack is normal charging, the low-voltage battery pack in the main battery pack and the external battery pack is charged with priority until the parallel conditions are met, and the main battery pack is controlled. The switch unit of the external battery pack is opened, and an instruction is sent to the external battery pack, so that the switch unit of the external battery pack is opened, the switch units are connected to each other, and the battery cell units are connected to each other.
5. The parallel control method of a battery pack according to claim 1, wherein connecting each external battery pack to the main battery pack based on the determination result and the current working state of the main battery pack includes:

   If the determination result is that the parallel conditions are not met and the working status of the main battery pack is normal loading or normal charging, then adjust the voltages of the main battery pack and the external battery pack, and adjust the voltage. Afterwards, each external battery pack is connected to the main battery pack.
6. The parallel control method of a battery pack according to any one of claims 1 to 5, wherein the battery status information of each external battery pack and the battery status information of the main battery pack are respectively determined based on the battery status information of each external battery pack. Check whether the external battery pack meets the parallel conditions, including:

   Determine the target parallel method;

   Based on the battery status information of each of the external battery packs and the battery status information of the main battery pack, it is determined whether each of the external battery packs meets the parallel conditions corresponding to the target parallel mode.
7. The parallel control method of the battery pack according to claim 6, wherein the target parallel mode is: parallel mode; the battery status information based on each of the external battery packs and the battery status of the main battery pack The information determines whether each of the external battery packs meets the parallel conditions corresponding to the target parallel mode, including:

   Determine the voltage difference between the main battery pack and the external battery pack;

   Determining the circulating current generated by the parallel connection based on the voltage difference and the nominal impedance of the battery pack;

   Determine whether the generated circulating current is less than the maximum safe current of the external battery pack and the maximum safe current of the main battery pack;

   If yes, it is determined that the external battery pack meets the parallel conditions; if not, it is determined that the external battery pack does not meet the parallel conditions.
8. The parallel control method of a battery pack according to claim 6, wherein the target parallel mode is a series mode; the battery status information based on the battery status information of each external battery pack and the battery status information of the main battery pack Respectively determine whether each of the external battery packs meets the parallel conditions corresponding to the target parallel mode, including:

   Determine the voltage difference between the main battery pack and the external battery pack;

   Compare the magnitude relationship between the voltage difference and the voltage difference threshold;

   If the voltage difference is less than the voltage difference threshold, it is determined that the external battery pack meets the parallel condition;

   If the voltage difference is greater than or equal to the voltage difference threshold, it is determined that the external battery pack does not meet the parallel condition.
9. The parallel control method of a battery pack according to any one of claims 1 to 8, wherein before obtaining the battery status information of the target battery pack, the method further includes:

   Scan through the communication unit whether there is an external battery pack to be connected;

   If so, assign addresses to each of the external battery packs and determine the order of the external battery packs.
10. The parallel control method of a battery pack according to any one of claims 1 to 9, wherein before obtaining the battery status information received by the communication unit from each external battery pack, it further includes:

    The battery management unit of each battery pack in the battery pack system determines whether the battery pack serves as the main battery pack according to the level signal of the external interface of the communication unit.
11. The parallel control method of a battery pack according to any one of claims 1 to 10, wherein the communication unit of each battery pack includes an external interface;

    The external interface of the communication unit of the main battery pack is connected to the external interface of the first external battery pack communication unit among the plurality of external battery packs; starting from the communication unit of the first external battery pack, so The communication units of each external battery group in the plurality of external battery groups are connected in series in sequence according to the order of each external battery group.
12. The parallel control method of a battery pack according to any one of claims 1 to 11, wherein each battery pack further includes: a bidirectional electrical unit;

    In each of the battery packs, the two-way electrical unit is connected to the switch unit, the charge and discharge unit and the battery unit respectively; the two-way electrical unit is used to charge or charge according to the working status of the battery pack. Discharge function.
13. A parallel control device for a battery pack, wherein the device is applied to a battery management unit of a main battery pack of a battery pack system, the battery pack system includes multiple battery packs, and the multiple battery packs include a main battery The battery pack and at least one external battery pack to be connected to the main battery pack, each of the battery packs includes: a communication unit, a battery management unit, a switch unit, a battery unit, and a charge and discharge unit;

    In each of the battery packs, the battery management unit is respectively connected to the communication unit, the switch unit, the battery unit and the charge and discharge unit, and there is a gap between the battery unit and the charge and discharge unit. connect;

    The communication unit of the main battery pack and the communication units of each external battery pack are connected in sequence; the switch unit of the main battery pack and the switch unit of each external battery pack are connected in parallel, and the switch unit of the main battery pack is connected in parallel. The battery unit is connected to the battery unit of each external battery pack;

    The device includes: an acquisition module, a determination module and a connection module;

    The acquisition module is configured to acquire battery status information received by the communication unit from each external battery pack, where the battery status information includes: voltage and maximum safe current;

    The determination module is configured to respectively determine whether each of the external battery packs meets the parallel condition based on the battery status information of each of the external battery packs and the battery status information of the main battery pack;

    The connection module is configured to connect each external battery pack to the main battery pack based on the determination result and the current working status of the main battery pack.
14. The parallel control device of the battery pack according to claim 13, wherein the connection module is further configured to: if the determination result satisfies the parallel conditions and the working status of the main battery pack is no charging or discharging, normal When loading or charging normally, the switch unit of the main battery pack is controlled to open, and an instruction is sent to the external battery pack to open the switch unit of the external battery pack, and the switch units are connected to each other. The battery cells are connected to each other.
15. The parallel control device of the battery pack according to claim 13, wherein the connection module is further configured to: if the determination result is that the parallel condition is not met and the working state of the main battery pack is no charging or discharging , after the main battery pack enters a new working state of normal loading or normal charging, each external battery pack is connected to the main battery pack according to the new working state of the main battery pack.
16. The parallel control device of the battery pack according to claim 15, wherein the connection module is further configured to: when the new working state of the main battery pack is normal loading, make the main battery pack and the The high-voltage battery pack in the external battery pack supplies power to the load until the parallel conditions are met, the switch unit of the main battery pack is controlled to open, and an instruction is sent to the external battery pack to cause the external battery pack to The switch unit is opened, the switch units are connected to each other, and the battery core units are connected to each other;

    When the new working state of the main battery pack is normal charging, the low-voltage battery pack in the main battery pack and the external battery pack is charged with priority until the parallel conditions are met, and the main battery pack is controlled. The switch unit of the external battery pack is opened, and an instruction is sent to the external battery pack, so that the switch unit of the external battery pack is opened, the switch units are connected to each other, and the battery cell units are connected to each other.
17. The parallel control device of the battery pack according to claim 13, wherein the connection module is further configured to: when the new working state of the main battery pack is normal loading, make the main battery pack and the The high-voltage battery pack in the external battery pack supplies power to the load until the parallel conditions are met, the switch unit of the main battery pack is controlled to open, and an instruction is sent to the external battery pack to cause the external battery pack to The switch unit is opened, the switch units are connected to each other, and the battery core units are connected to each other;

    When the new working state of the main battery pack is normal charging, the low-voltage battery pack in the main battery pack and the external battery pack is charged with priority until the parallel conditions are met, and the main battery pack is controlled. The switch unit of the external battery pack is opened, and an instruction is sent to the external battery pack, so that the switch unit of the external battery pack is opened, the switch units are connected to each other, and the battery cell units are connected to each other.
18. The parallel control device of a battery pack according to claim 13, wherein the determination module is further configured to: determine a target parallel mode; based on the battery status information of each external battery pack and the battery status of the main battery pack. The status information determines whether each of the external battery packs meets the parallel conditions corresponding to the target parallel mode.
19. A computer device, which includes: a memory and a processor, and the memory stores information that can be stored at the location. A computer program running on a processor. When the processor executes the computer program, the steps of the method described in any one of claims 1 to 12 are implemented.
20. A computer-readable storage medium, wherein a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the method described in any one of claims 1 to 12 are implemented.