A control circuit, method and device for multiple battery packs in parallel

Abstract

The present disclosure provides a kind of control circuit, method and device of multiple battery packs parallel, it is related to battery technical field.The circuit includes first battery pack, second battery pack and load unit, the first battery pack and the second battery pack are respectively connected in parallel with the load unit, first switch unit and first MOS unit are connected in series between the first battery pack and the load unit, second switch unit and second MOS unit are connected in series between the second battery pack and the load unit, MOS control module is connected to the first MOS unit and the second MOS unit, the MOS control module is used to control the closure and opening of the first MOS unit and the second MOS unit according to the voltage difference between the source and drain of the first MOS unit and the second MOS unit.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to a control circuit, method, and apparatus for multiple battery packs connected in parallel. Background Technology

[0002] Currently, there are two main types of battery packs: lead-acid batteries and lithium batteries. The parallel connection method for multiple lead-acid battery packs is simple and straightforward, directly connecting the corresponding positive and negative terminals together. This parallel connection process is prone to arcing, and the terminals at the connection points can be burned by high current, leading to connection failures. In some cases, excessive voltage differences can cause excessive current, resulting in overheating of the output lines and potential safety hazards. The parallel connection of multiple lithium battery packs employs communication control strategies, current-limiting switches, and current-limiting resistors. The advantages are that arcing and high-current charging / discharging are avoided during parallel connection; the disadvantages are more complex control and higher cost. Summary of the Invention

[0003] The purpose of this invention is to provide a control circuit, method, and apparatus for multiple battery packs connected in parallel, in order to solve the technical problems mentioned in the background art: in the prior art, the use of multiple lithium battery packs in parallel involves communication control strategies, current limiting switches, current limiting resistors, etc., which are complex and costly to control.

[0004] To achieve the above objectives, according to one aspect of this disclosure, a control circuit for multiple battery packs connected in parallel is provided, the circuit comprising:

[0005] The system comprises a first battery pack, a second battery pack, and a load unit. The first battery pack and the second battery pack are connected in parallel with the load unit. A first switching unit and a first MOS unit are connected in series between the first battery pack and the load unit. A second switching unit and a second MOS unit are connected in series between the second battery pack and the load unit. A MOS control module is connected to the first MOS unit and the second MOS unit. The MOS control module is used to control the opening and closing of the first MOS unit and the second MOS unit based on the voltage difference between the source and drain terminals of the first MOS unit and the second MOS unit.

[0006] In one implementation, the first switching unit is connected to one side of the positive terminal of the first battery pack, and the first MOS unit is connected to one side of the negative terminal of the first battery pack.

[0007] In one implementation, the second switching unit is connected to one side of the positive terminal of the second battery pack, and the second MOS unit is connected to one side of the negative terminal of the second battery pack.

[0008] In one implementation, the MOS control module includes a first comparator, a second comparator, and a third comparator connected in parallel. The input terminals of the first comparator, the second comparator, and the third comparator are used to obtain the voltage difference between the source and drain of the first MOS cell and the second MOS cell. The input terminals of the first comparator, the second comparator, and the third comparator are connected to the gate of the first MOS cell and the second MOS cell.

[0009] In one implementation, the output of the first comparator is connected to a third switching unit. The first comparator is used to control the opening and closing of the third switching unit. The first terminal of the third switching unit is connected to the gates of the first MOS unit and the second MOS unit, and the second terminal of the third switching unit is connected to a power supply unit.

[0010] In one implementation, the output of the second comparator is connected to the gates of the first MOS cell and the second MOS cell.

[0011] In one implementation, the output of the third comparator is connected to the gates of the first MOS unit and the second MOS unit via a third MOS unit, and the third comparator is used to control the opening and closing of the third MOS unit.

[0012] According to another aspect of this disclosure, a control method for multiple battery packs connected in parallel is provided, the method being applied to a control circuit for multiple battery packs connected in parallel as described in any of the preceding claims, the method comprising:

[0013] Control the closing of the first switch unit to obtain the first output voltage value;

[0014] Control the closing of the second switch unit to obtain the second output voltage value;

[0015] Compare the first output voltage value and the second output voltage value;

[0016] If the first output voltage value is greater than the second output voltage value, then the second MOS unit is kept closed.

[0017] If the first output voltage value is less than the second output voltage value, then the first MOS unit is kept closed.

[0018] If the first output voltage value is equal to the second output voltage value, then it is not necessary to close the first MOS cell and the second MOS cell.

[0019] In one implementation, the control method for multiple battery packs in parallel further includes:

[0020] Set a first voltage threshold, a second voltage threshold, and a third voltage threshold for the MOS control module;

[0021] The MOS control module acquires the voltage values ​​at the source and drain terminals of the first MOS unit and the second MOS unit;

[0022] If the voltage value is greater than the first voltage threshold, the MOS control module controls the first MOS unit and the second MOS unit to turn on;

[0023] If the voltage value is greater than the second voltage threshold and less than the first voltage threshold, then control the first MOS unit and the second MOS unit to turn on;

[0024] If the voltage value is less than the third threshold, then the first MOS unit and the second MOS unit are turned off.

[0025] According to another aspect of the present disclosure, a control device for multiple battery packs connected in parallel is provided, the device comprising:

[0026] At least one processor;

[0027] At least one memory for storing at least one program;

[0028] When the at least one program is executed by the at least one processor, the at least one processor implements the control method for multiple battery packs in parallel as described in any of the above-mentioned methods.

[0029] The above-described one or more technical solutions in the embodiments of this application have at least one or more of the following technical effects:

[0030] An embodiment of the present invention provides a control circuit for multiple battery packs connected in parallel. The circuit includes: a first battery pack, a second battery pack, a load unit, a first switching unit, a first MOS unit, a second switching unit, a second MOS unit, and a MOS control module. The circuit controls the closing of the first switching unit to obtain a first output voltage value; controls the closing of the second switching unit to obtain a second output voltage value; compares the first output voltage value and the second output voltage value; if the first output voltage value is greater than the second output voltage value, the second MOS unit is continuously closed, connecting the entire current loop to the first battery pack with the higher voltage, and the current flows into the load through a diode, forming a closed loop; if the first output voltage value is less than the second output voltage value, the first MOS unit is continuously closed, connecting the entire current loop to the second battery pack with the higher voltage, and the current flows into the load through a diode, forming a closed loop; if the first output voltage value is equal to the second output voltage value, it is not necessary to close the first MOS unit and the second MOS unit. In addition, by setting a first voltage threshold, a second voltage threshold, and a third voltage threshold for the MOS control module, the MOS control module acquires the voltage values ​​at the source and drain terminals of the first MOS unit and the second MOS unit. If the voltage value is greater than the first voltage threshold, the MOS control module controls the first MOS unit and the second MOS unit to turn on, so that the high voltage between the two battery packs will charge the low voltage. If the voltage value is greater than the second voltage threshold and less than the first voltage threshold, the first MOS unit and the second MOS unit are controlled to turn on, so that the high voltage between the two battery packs will charge the low voltage. If the voltage value is less than the third threshold, the first MOS unit and the second MOS unit are controlled to turn off, so that the high voltage between the two battery packs will charge the low voltage through a diode circuit, reducing the current passing through. This design can switch the current magnitude between multiple battery packs in parallel in application scenarios by comparing the voltage of the hardware circuit. The control is simple, has a short response time, and is low in cost.

[0031] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a control circuit module for multiple battery packs connected in parallel, according to an exemplary embodiment.

[0033] Figure 2 This is a schematic diagram of a control circuit for multiple battery packs connected in parallel according to an exemplary embodiment;

[0034] Figure 3 This is a schematic diagram of a MOS control module circuit for a control circuit of multiple battery packs connected in parallel, according to an exemplary embodiment.

[0035] Explanation of reference numerals in the attached drawings: 100, first battery pack; 200, second battery pack; 300, load unit; 400, first switching unit; 500, second switching unit; 600, first MOS unit; 700, second MOS unit; 800, MOS control module. Detailed Implementation

[0036] This invention provides a control circuit, method, and apparatus for multiple battery packs connected in parallel, which solves the technical problems of complex and costly control methods such as communication control strategies, current limiting switches, and current limiting resistors in the parallel use of multiple lithium battery packs in the prior art.

[0037] The overall concept of the technical solution provided by this invention is as follows:

[0038] Please see Figure 1 The control circuit for multiple battery packs connected in parallel includes: a first battery pack 100, a second battery pack 200, and a load unit 300. The first battery pack 100 and the second battery pack 200 are respectively connected in parallel with the load unit 300. A first switching unit 400 and a first MOS unit 600 are connected in series between the first battery pack 100 and the load unit 300. A second switching unit 500 and a second MOS unit 700 are connected in series between the second battery pack 200 and the load unit 300. A MOS control module 800 is connected to the first MOS unit 600 and the second MOS unit 700. The MOS control module 800 is used to control the closing and opening of the first MOS unit 600 and the second MOS unit 700 according to the voltage difference between the source and drain terminals of the first MOS unit 600 and the second MOS unit 700.

[0039] The first battery pack 100 and the second battery pack 200 are connected in parallel with the load unit 300. The first battery pack 100 and the second battery pack 200 together provide power to the load unit 300. The first switching unit 400 and the first MOS unit 600 control the flow of current in the circuit of the first battery pack 100, and the second switching unit 500 and the second MOS unit 700 control the flow of current in the circuit of the second battery pack 200. A first output voltage value is obtained by controlling the closing of the first switching unit 400; a second output voltage value is obtained by controlling the closing of the second switching unit 500; and the first output voltage value is compared with... The second output voltage value; if the first output voltage value is greater than the second output voltage value, then the second MOS unit 700 is continuously closed, connecting the entire current loop to the high-voltage first battery pack 100, and flowing into the load through the diode to form a closed loop; if the first output voltage value is less than the second output voltage value, then the first MOS unit 600 is continuously closed, connecting the entire current loop to the high-voltage second battery pack 200, and flowing into the load through the diode to form a closed loop; if the first output voltage value is equal to the second output voltage value, then the first MOS unit 600 and the second MOS unit 700 do not need to be closed. In addition, by setting a first voltage threshold, a second voltage threshold, and a third voltage threshold for the MOS control module 800; the MOS control module 800 obtains the voltage values ​​at the source and drain terminals of the first MOS unit 600 and the second MOS unit 700; if the voltage value is greater than the first voltage threshold, the MOS control module 800 controls the first MOS unit 600 and the second MOS unit 700 to open, so that the high voltage between the two battery packs will charge the low voltage; if the voltage value is greater than the second voltage threshold and less than the first voltage threshold, then the first MOS unit 600 and the second MOS unit 700 are closed. If the voltage value is less than the third threshold, then the first MOS unit 600 and the second MOS unit 700 are turned on, so that the high voltage between the two battery packs will charge the low voltage. If the voltage value is less than the third threshold, then the first MOS unit 600 and the second MOS unit 700 are turned off, so that the high voltage between the two battery packs will charge the low voltage through the diode circuit, reducing the current passing through. This patent proposes a new control circuit for multiple battery packs in parallel. It can switch the current between multiple battery packs in parallel in the application scenario by comparing the voltage of the hardware circuit. The control is simple, the response time is short, and the cost is low.

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example 1

[0042] Furthermore, the first switching unit 400 is connected to one side of the positive terminal of the first battery pack 100, and the first MOS unit 600 is connected to one side of the negative terminal of the first battery pack 100. (See also...) Figure 2 The first switching unit 400 includes a switch K1, the first MOS unit 600 includes a MOS transistor MOS1, and Pack1 is the circuit of the first battery pack 100. The switch K1 and the MOS transistor MOS1 can control the flow of current in the circuit of the first battery pack 100.

[0043] Furthermore, the second switching unit 500 is connected to one side of the positive terminal of the second battery pack 200, and the second MOS unit 700 is connected to one side of the negative terminal of the second battery pack 200. (See also...) Figure 2 The second switching unit 500 includes a switch K2, the second MOS unit 700 includes a MOS transistor MOS2, and Pack2 is the circuit of the second battery pack 200. The switch K2 and the MOS transistor MOS2 can control the flow of current in the circuit of the second battery pack 200.

[0044] Furthermore, such as Figure 2 As shown, when switch K1 is closed, the output voltage is Vp1; when switch K2 is closed, the output voltage is Vp2. The voltages between the two batteries are compared: ΔV = Vp1 - Vp2, where ΔV is the difference between Vp1 and Vp2. When ΔV > 0, MOSFET MOS2 remains closed, and the entire current loop can pass through the diode from the battery with the higher voltage, thus forming a loop. When ΔV < 0, MOSFET MOS1 remains closed, and the entire current loop can pass through the diode from the battery with the higher voltage, thus forming a loop. When ΔV = 0, there is no voltage difference between the two batteries, and it is not necessary to close the MOSFET.

[0045] Furthermore, the MOS control module 800 includes a first comparator, a second comparator, and a third comparator connected in parallel. The input terminals of the first, second, and third comparators are used to acquire the voltage difference between the source and drain of the first MOS cell 600 and the second MOS cell 700. The input terminals of the first, second, and third comparators are connected to the gates of the first MOS cell 600 and the second MOS cell 700. The input terminals of the first, second, and third comparators can monitor the gate voltages of the first MOS cell 600 and the second MOS cell 700 and use them as comparison input signals. By comparing the gate voltages through the first, second, and third comparators, the corresponding switching units are controlled according to the comparison results to achieve current regulation and voltage balance.

[0046] Furthermore, the output of the first comparator is connected to a third switching unit. The first comparator is used to control the opening and closing of the third switching unit. The first terminal of the third switching unit is connected to the gates of the first MOS unit 600 and the second MOS unit 700, and the second terminal of the third switching unit is connected to the power supply unit. (See also...) Figure 3 The first comparator includes comparator U1, and the third switching unit includes switch K0.

[0047] Furthermore, the output of the second comparator is connected to the gates of the first MOS cell 600 and the second MOS cell 700, wherein, please refer to... Figure 3 The second comparator includes comparator U2.

[0048] Furthermore, the output of the third comparator is connected to the gates of the first MOS unit 600 and the second MOS unit 700 via a third MOS unit. The third comparator is used to control the switching on and off of the third MOS unit. (See also...) Figure 3 The third comparator includes comparator U3, and the third MOS unit includes MOS transistor MOS3.

[0049] Specifically, three voltage thresholds V1, V2, and V3 are set. Please refer to [link / reference]. Figure 2 and Figure 3Define the voltage difference between the source and drain of the first MOS cell 600 and the second MOS cell 700, i.e., Vs and Vd, as V0. The change of V0 depends on the change of the current through the MOS terminals. When V0 > V1, comparator U1 outputs a high level, controlling switch K0 to close. The voltage at the gate of MOS transistors MOS1 and MOS2 is pulled up to the power supply voltage, outputting a high level, controlling MOS transistors MOS1 and MOS2 to open. In this way, the high voltage between the first battery pack 100 and the second battery pack 200 will charge the low voltage. When V2 < V0 < V1, comparator U2 outputs a high level, M... The gates (G) of MOSFETs MOS1 and MOS2 directly output a high level, controlling MOSFETs MOS1 and MOS2 to open. In this way, the high voltage between the first battery pack 100 and the second battery pack 200 will charge the low voltage. When V0 < V3, comparator U3 outputs a high level, controlling MOSFET MOS3 to close. The gates (G) of MOSFETs MOS1 and MOS2 are pulled down to ground, outputting a low level, controlling MOSFETs MOS1 and MOS2 to open. In this way, the high voltage between the first battery pack 100 and the second battery pack 200 will charge the low voltage through the diode circuit, reducing the current passing through.

[0050] In summary, the embodiments of the present invention provide a new control circuit for multiple battery packs in parallel. By comparing the voltage of the hardware circuit, the current magnitude between the multiple battery packs in parallel application scenarios can be switched. The control is simple, has a short response time, and is low in cost.

[0051] Example 2

[0052] This invention provides a control method for multiple battery packs connected in parallel, the method comprising:

[0053] Control the closure of the first switch unit 400 to obtain the first output voltage value;

[0054] Control the closing of the second switch unit 500 to obtain the second output voltage value;

[0055] Compare the first output voltage value and the second output voltage value;

[0056] If the first output voltage value is greater than the second output voltage value, then the second MOS unit 700 is controlled to remain closed.

[0057] If the first output voltage value is less than the second output voltage value, then the first MOS unit 600 is kept closed.

[0058] If the first output voltage value is equal to the second output voltage value, then it is not necessary to close the first MOS unit 600 and the second MOS unit 700.

[0059] Specifically, such as Figure 2 As shown, when switch K1 is closed, the first output voltage value is Vp1, which is the output voltage value of the first battery pack 100 circuit. When switch K2 is closed, the second output voltage value is Vp2, which is the output voltage value of the second battery pack 200 circuit. The voltages between the two packs are compared, ΔV = Vp1 - Vp2, where ΔV is the difference between Vp1 and Vp2. When ΔV > 0, it means that the first output voltage value is greater than the second output voltage value. At this time, MOSFET MOS2 is continuously closed, and the entire current loop can pass through the diode from the battery pack with the higher voltage, thus forming a loop. When ΔV < 0, it means that the second output voltage value is greater than the first output voltage value. At this time, MOSFET MOS1 is continuously closed, and the entire current loop can pass through the diode from the battery pack with the higher voltage, thus forming a loop. When ΔV = 0, it means that the first output voltage value is equal to the second output voltage value. At this time, there is no voltage difference between the two packs, and it is not necessary to close the MOSFET.

[0060] Furthermore, a control method for multiple battery packs connected in parallel also includes:

[0061] Set a first voltage threshold, a second voltage threshold, and a third voltage threshold for the MOS control module 800;

[0062] The MOS control module 800 acquires the voltage values ​​at the source and drain terminals of the first MOS unit 600 and the second MOS unit 700.

[0063] If the voltage value is greater than the first voltage threshold, the MOS control module 800 controls the first MOS unit 600 and the second MOS unit 700 to turn on;

[0064] If the voltage value is greater than the second voltage threshold and less than the first voltage threshold, then control the first MOS unit 600 and the second MOS unit 700 to turn on;

[0065] If the voltage value is less than the third threshold, then the first MOS unit 600 and the second MOS unit 700 are turned off.

[0066] Specifically, three voltage thresholds V1, V2, and V3 are set, where the first voltage threshold is V1, the second voltage threshold is V2, and the third voltage threshold is V3. Please refer to [link to relevant documentation]. Figure 2 and Figure 3The voltage values ​​across the source and drain of the first MOS cell 600 and the second MOS cell 700, i.e., the voltage difference between Vs and Vd, are defined as V0. The change of V0 depends on the change of the current through the MOS terminals. When V0 > V1, comparator U1 outputs a high level, controlling switch K0 to close. The voltage at the gate of MOS transistors MOS1 and MOS2 is pulled up to the power supply voltage, outputting a high level, controlling MOS transistors MOS1 and MOS2 to open. In this way, the high voltage between the first battery pack 100 and the second battery pack 200 will charge the low voltage. When V2 < V0 < V1, comparator U2 outputs a high level. When V0 < V3, comparator U3 outputs a high level, controlling MOSFET MOS1 and MOSFET MOS2 to open, so that the high voltage between the first battery pack 100 and the second battery pack 200 will charge the low voltage; when V0 < V3, comparator U3 outputs a high level, controlling MOSFET MOS3 to close, and the gates of MOSFET MOS1 and MOSFET MOS2 are pulled down to ground, outputting a low level, controlling MOSFET MOS1 and MOSFET MOS2 to open, so that the high voltage between the first battery pack 100 and the second battery pack 200 will charge the low voltage through the diode circuit, reducing the current passing through.

[0067] In summary, the embodiments of the present invention provide a new control method for multiple battery packs in parallel. By comparing the voltage of the hardware circuit, the current magnitude between the multiple battery packs in parallel can be switched in the application scenario. The control is simple, has a short response time, and is low in cost.

[0068] Example 3

[0069] This invention provides a control device for multiple battery packs connected in parallel, comprising:

[0070] At least one processor;

[0071] At least one memory for storing at least one program;

[0072] A processor may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor can be implemented using at least one of the following hardware forms: DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), or PLA (Programmable Logic Array). A processor may also include a main processor and coprocessors. The main processor, also known as the CPU (Central Processing Unit), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state.

[0073] The memory may include one or more computer-readable storage media, which may be non-transitory. The memory may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices.

[0074] When the at least one program is executed by the at least one processor, causing the at least one processor to implement a control method for multiple battery packs in parallel as described in the foregoing embodiments, the various variations and specific embodiments in the foregoing embodiments are also applicable to a control device for multiple battery packs in parallel in this embodiment. Through the foregoing detailed description of a control method for multiple battery packs in parallel, those skilled in the art can clearly understand the implementation method of a control device for multiple battery packs in parallel in this embodiment. For the sake of brevity, it will not be described in detail here.

[0075] In an exemplary embodiment, a storage medium including instructions is also provided, such as a memory including instructions, which can be executed by the processor of a terminal to complete the aforementioned control method for parallel connection of multiple battery packs. Optionally, the storage medium is a non-transitory computer-readable storage medium, such as ROM (Read-Only Memory), RAM (Random Access Memory), CD-ROM (Compact Disc Read-Only Memory), magnetic tape, floppy disk, and optical data storage device.

[0076] In an exemplary embodiment, a computer program product is also provided, which includes computer program code stored in a computer-readable storage medium. A processor of a computer device reads the computer program code from the computer-readable storage medium and executes the computer program code, causing the computer device to perform the operations performed in the above-described control method for multiple battery packs in parallel.

[0077] Any aspects of this invention not described in detail are well-known to those skilled in the art.

[0078] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A control circuit for multiple battery packs connected in parallel, characterized in that, include: The system comprises a first battery pack, a second battery pack, and a load unit. The first battery pack and the second battery pack are connected in parallel with the load unit. A first switching unit and a first MOS unit are connected in series between the first battery pack and the load unit. A second switching unit and a second MOS unit are connected in series between the second battery pack and the load unit. A MOS control module is connected to the first MOS unit and the second MOS unit. The MOS control module is used to control the closing and opening of the first MOS unit and the second MOS unit according to the voltage difference between the source and drain terminals of the first MOS unit and the second MOS unit. The MOS control module includes a first comparator, a second comparator, and a third comparator connected in parallel. The input terminals of the first comparator, the second comparator, and the third comparator are used to obtain the voltage difference between the source and drain of the first MOS cell and the second MOS cell. The input terminals of the first comparator, the second comparator, and the third comparator are connected to the gate of the first MOS cell and the second MOS cell. The output of the first comparator is connected to a third switching unit. The first comparator is used to control the opening and closing of the third switching unit. The first terminal of the third switching unit is connected to the gate of the first MOS unit and the second MOS unit, and the second terminal of the third switching unit is connected to the power supply unit. The output of the second comparator is connected to the gates of the first MOS unit and the second MOS unit; The output of the third comparator is connected to the gates of the first MOS unit and the second MOS unit through the third MOS unit, and the third comparator is used to control the opening and closing of the third MOS unit; The MOS control module sets a first voltage threshold, a second voltage threshold, and a third voltage threshold. The MOS control module acquires the voltage values ​​at the source and drain terminals of the first MOS unit and the second MOS unit; If the voltage value is greater than the first voltage threshold, the MOS control module controls the first MOS unit and the second MOS unit to turn on; If the voltage value is greater than the second voltage threshold and less than the first voltage threshold, then control the first MOS unit and the second MOS unit to turn on; If the voltage value is less than the third voltage threshold, then the first MOS unit and the second MOS unit are turned off.

2. The control circuit for multiple battery packs in parallel according to claim 1, characterized in that, The first switching unit is connected to one side of the positive terminal of the first battery pack, and the first MOS unit is connected to one side of the negative terminal of the first battery pack.

3. The control circuit for multiple battery packs in parallel according to claim 1, characterized in that, The second switching unit is connected to one side of the positive terminal of the second battery pack, and the second MOS unit is connected to one side of the negative terminal of the second battery pack.

4. A control method for multiple battery packs connected in parallel, characterized in that, The method, applied to a control circuit for parallel connection of multiple battery packs as described in any one of claims 1-3, comprises: Control the closure of the first switch unit to obtain the first output voltage value; Control the closing of the second switch unit to obtain the second output voltage value; Compare the first output voltage value and the second output voltage value; If the first output voltage value is greater than the second output voltage value, then the second MOS unit is controlled to remain closed. If the first output voltage value is less than the second output voltage value, then the first MOS unit is kept closed. If the first output voltage value is equal to the second output voltage value, then it is not necessary to close the first MOS cell and the second MOS cell.

5. A control device for multiple battery packs connected in parallel, characterized in that, include: At least one processor; At least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the control method for multiple battery packs in parallel as described in claim 4.

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