Charging and discharging control circuit and vehicle

Abstract

This utility model discloses a charging and discharging control circuit and a vehicle, including a battery module, a first switching circuit, a second switching circuit, a third switching circuit, and a control chip. The battery module includes at least two battery packs; the positive terminal of each battery pack is used to connect to a positive terminal, and the negative terminal of each battery pack is used to connect to a negative terminal. A first switching circuit is provided between the positive terminals of any two adjacent battery packs; a second switching circuit is provided between the negative terminals of any two adjacent battery packs; each battery pack is connected in parallel with a third switching circuit; the control chip is connected to the first, second, and third switching circuits, and is used to connect to a signal control terminal to control the operation of the first, second, and third switching circuits. This technical solution can ensure the charging speed of the battery module while also taking into account the discharge capacity and safety of the battery module during charging.

Description

Technical Field

[0001] This utility model relates to the field of charging and discharging technology, and in particular to a charging and discharging control circuit and a vehicle. Background Technology

[0002] With the rapid development of new energy vehicles, users' demand for charging efficiency is increasing daily. Currently, mainstream fast charging technology mainly achieves this by increasing the charging current. However, high-current charging has significant drawbacks. For example, high current leads to increased heating of charging equipment and battery packs, which can easily cause thermal runaway, increasing the risk of short circuits and fires. Furthermore, high temperatures accelerate battery aging, and frequent fast charging will significantly shorten battery cycle life. To reduce current, the industry is attempting to shift to high-voltage charging solutions (such as 800V platforms). However, high voltage also brings safety hazards. High-voltage systems have stringent insulation requirements; if leakage or insulation failure occurs, it may pose a risk of electric shock to personnel. In scenarios such as dampness or collisions, high-voltage circuits are prone to arcing or breakdown, threatening driving safety.

[0003] Therefore, how to improve charging speed while ensuring the safety of high-voltage systems has become an urgent technical problem to be solved. Utility Model Content

[0004] This utility model provides a charging and discharging control circuit and a vehicle to solve the problem of how to improve charging speed while ensuring the safety of high-voltage systems.

[0005] A charging and discharging control circuit includes a battery module, a first switching circuit, a second switching circuit, a third switching circuit, and a control chip;

[0006] The battery module includes at least two battery packs; the positive terminal of each battery pack is used to connect to the positive terminal connection, and the negative terminal of each battery pack is used to connect to the negative terminal connection.

[0007] A first switching circuit is provided between the positive terminals of any two adjacent battery packs;

[0008] A second switching circuit is provided between the negative terminals of any two adjacent battery packs;

[0009] Each of the battery packs is connected in parallel with one of the third switching circuits;

[0010] The control chip is connected to the first switch circuit, the second switch circuit, and the third switch circuit, and is used to connect to the signal control terminal to receive the charge and discharge control signal output by the signal control terminal, and to control the first switch circuit, the second switch circuit, and the third switch circuit to work according to the charge and discharge control signal.

[0011] Furthermore, when the charge / discharge control signal is a charging control signal, each of the first switch circuits is disconnected, each of the second switch circuits is disconnected, and each of the third switch circuits is turned on; when the charge / discharge control signal is a discharging control signal, each of the first switch circuits is turned on, each of the second switch circuits is turned on, and each of the third switch circuits is disconnected.

[0012] Furthermore, the charge / discharge control circuit also includes a speaker connected to the control chip. The speaker is used when the charge / discharge control signal is a charging control signal and each of the first switch circuits is turned on, each of the second switch circuits is turned on, and each of the third switch circuits is turned off, or when the charge / discharge control signal is a discharging control signal and each of the first switch circuits is turned off, each of the second switch circuits is turned off, and each of the third switch circuits is turned on.

[0013] Furthermore, the charging and discharging control circuit also includes a charging and discharging mode selection circuit; the first terminal of the mode switching circuit is connected to the signal control terminal, and the second terminal of the mode switching circuit is grounded, for outputting the charging control signal or the discharging control signal to the signal control terminal.

[0014] Furthermore, the charge / discharge mode selection circuit includes a trigger switch; the first end of the trigger switch is connected to the signal control terminal, and the second end of the trigger switch is grounded, for outputting the charging control signal in the first trigger state and the discharging control signal in the second trigger state.

[0015] Furthermore, the charge / discharge control circuit also includes a fourth switching circuit;

[0016] The first end of the fourth switching circuit is coupled to the positive terminal, and the second end of the fourth switching circuit is coupled to the positive terminal of each battery pack; or, the first end of the fourth switching circuit is coupled to the negative terminal, and the second end of the fourth switching circuit is coupled to the negative terminal of each battery pack.

[0017] The control chip is connected to the control terminal of the fourth switching circuit and is used to disconnect the fourth switching circuit when any of the first switching circuits, any of the second switching circuits, or any of the third switching circuits malfunctions.

[0018] Furthermore, the control chip includes a control terminal and a detection terminal; the first switching circuit includes a first relay; the second switching circuit includes a second relay; and the third switching circuit includes a third relay.

[0019] The control terminal of the control chip is connected to the coil of each of the first relays, the coil of each of the second relays, and the coil of each of the third relays.

[0020] The detection terminal of the control chip is connected to the contact switch of each of the first relays, the contact switch of each of the second relays, and the contact switch of each of the third relays, so as to disconnect the fourth switching circuit when the switching voltage of any of the contact switches is abnormal.

[0021] Furthermore, the charge / discharge control circuit also includes a first indicator light; the first indicator light is connected to the control chip and the ground terminal, and is used to operate when the battery pack is charging.

[0022] Furthermore, the charge / discharge control circuit also includes a second indicator light; the second indicator light is connected to the control chip and the ground terminal, and is used to operate when the battery pack is discharging.

[0023] A vehicle including the aforementioned charging and discharging control circuit.

[0024] This utility model embodiment provides a charging and discharging control circuit and a vehicle. The charging and discharging control circuit includes a battery module, a first switching circuit, a second switching circuit, a third switching circuit, and a control chip. The battery module includes at least two battery packs. The positive terminal of each battery pack is used to connect to the positive terminal connection, and the negative terminal of each battery pack is used to connect to the negative terminal connection. A first switching circuit is provided between the positive terminals of any two adjacent battery packs. A second switching circuit is provided between the negative terminals of any two adjacent battery packs. Each battery pack is connected in parallel with a third switching circuit. The control chip is connected to the first, second, and third switching circuits and is used to connect to a signal control terminal. It is used to receive the charging and discharging control signal output by the signal control terminal and control the operation of the first, second, and third switching circuits according to the charging and discharging control signal. This allows the first, second, and third switching circuits to switch the connection relationship between at least two battery packs, thereby ensuring the charging speed of the battery module while also considering the discharge capacity and safety of the battery module during charging. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1This is a schematic diagram of a charging and discharging control circuit in one embodiment of the present invention.

[0027] In the diagram: 1. Battery module; 2. First switching circuit; 3. Second switching circuit; 4. Third switching circuit; 5. Fourth switching circuit; 6. Charging / discharging mode selection circuit. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0029] It should be understood that this invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art.

[0030] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0031] To fully understand this utility model, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0032] This embodiment provides a charge / discharge control circuit, such as... Figure 1As shown, the system includes a battery module 1, a first switching circuit 2, a second switching circuit 3, a third switching circuit 4, and a control chip U1. The battery module 1 includes at least two battery packs. The positive terminal of each battery pack is connected to the positive terminal B+, and the negative terminal of each battery pack is connected to the negative terminal B-. A first switching circuit 2 is provided between the positive terminals of any two adjacent battery packs. A second switching circuit 3 is provided between the negative terminals of any two adjacent battery packs. Each battery pack is connected in parallel with a third switching circuit 4. The control chip U1 is connected to the first switching circuit 2, the second switching circuit 3, and the third switching circuit 4, and is used to connect to a signal control terminal to receive the charge / discharge control signal output by the signal control terminal, and to control the first switching circuit 2, the second switching circuit 3, and the third switching circuit 4 to operate according to the charge / discharge control signal.

[0033] Each battery pack has the same rated voltage and rated current. For example, the rated voltage is 400V and the rated current is 50A. Both the GIA positive terminal B+ and the negative terminal B- are used to connect to charging equipment or electrical loads.

[0034] As an example, when the charge / discharge control signal received by the control chip U1 is a charging control signal, each of the first switch circuits 2 and 3 is disconnected, and each of the third switch circuits 4 is turned on, thereby connecting at least two battery packs in series to achieve high-voltage, low-current charging. When the charge / discharge control signal received by the control chip U1 is a discharging control signal, each of the first switch circuits 2 and 3 is turned on, and each of the third switch circuits 4 is disconnected, thereby connecting at least two battery packs in parallel to achieve low-voltage, high-current discharging. Specifically, the battery module 1 includes four battery packs, each with a rated voltage of 400V and a rated current of 50A. When the four battery packs are connected in series, the rated voltage of the battery module 1 is 1600V and the rated current is 50A. When the four battery packs are connected in parallel, the rated voltage of the battery module 1 is 400V and the rated current is 200A. This allows the connection between at least two battery packs to be switched according to the charge / discharge control signal, thereby ensuring the charging speed of battery module 1 while also taking into account the discharge capacity of battery module 1 during discharge and the safety of battery module 1 during charging.

[0035] In this embodiment, the charge / discharge control circuit includes a battery module 1, a first switching circuit 2, a second switching circuit 3, a third switching circuit 4, and a control chip U1. The battery module 1 includes at least two battery packs. The positive terminal of each battery pack is connected to the positive terminal B+, and the negative terminal of each battery pack is connected to the negative terminal B-. A first switching circuit 2 is provided between the positive terminals of any two adjacent battery packs. A second switching circuit 3 is provided between the negative terminals of any two adjacent battery packs. Each battery pack is connected in parallel with a third switching circuit 4. The control chip U1 is connected to the first switching circuit 2, the second switching circuit 3, and the third switching circuit 4, and is used to connect to a signal control terminal. It is used to receive the charge / discharge control signal output by the signal control terminal and control the first switching circuit 2, the second switching circuit 3, and the third switching circuit 4 to work according to the charge / discharge control signal. Thus, it can control the first switching circuit 2, the second switching circuit 3, and the third switching circuit 4 to work according to the charge / discharge control signal, so as to switch the connection relationship between at least two battery packs. This ensures the charging speed of the battery module 1 while taking into account the discharge capacity and the safety of the battery module 1 during charging.

[0036] In one embodiment, when the charge / discharge control signal is a charging control signal, each of the first switch circuits 2 is disconnected, each of the second switch circuits 3 is disconnected, and each of the third switch circuits 4 is turned on; when the charge / discharge control signal is a discharging control signal, each of the first switch circuits 2 is turned on, each of the second switch circuits 3 is turned on, and each of the third switch circuits 4 is disconnected. In this embodiment, when the charge / discharge control signal is a charging control signal, each of the first switch circuits 2 is disconnected, each of the second switch circuits 3 is disconnected, and each of the third switch circuits 4 is turned on; when the charge / discharge control signal is a discharging control signal, each of the first switch circuits 2 is turned on, each of the second switch circuits 3 is turned on, and each of the third switch circuits 4 is disconnected, thereby switching the connection relationship between at least two battery packs, thus ensuring the charging speed of the battery module 1 while also considering the discharge capacity of the battery module 1 during discharge and the safety of the battery module 1 during charging.

[0037] In one embodiment, the charge / discharge control circuit further includes a speaker YL connected to the control chip U1. The speaker YL is used to operate when the charge / discharge control signal is a charging control signal and each of the first switch circuits 2 is turned on, each of the second switch circuits 3 is turned on, and each of the third switch circuits 4 is turned off, or when the charge / discharge control signal is a discharging control signal and each of the first switch circuits 2 is turned off, each of the second switch circuits 3 is turned off, and each of the third switch circuits 4 is turned on.

[0038] As an example, when battery module 1 is charging, if at least two battery packs switch to parallel mode, or when battery module 1 is discharging, if at least two battery packs switch to series mode, the control chip U1 detects an abnormality and controls the speaker YL to emit an alarm sound to ensure safety during the charging and discharging process.

[0039] In one embodiment, the charge / discharge control circuit further includes a charge / discharge mode selection circuit 6; the first terminal of the mode switching circuit is connected to the signal control terminal, and the second terminal of the mode switching circuit is grounded, for outputting the charging control signal or the discharging control signal to the signal control terminal.

[0040] In this embodiment, the user can generate charging control signals or discharging control signals through the mode switching circuit to instruct the control chip U1 to control the first switching circuit 2, the second switching circuit 3, and the third switching circuit 4, ensuring the flexibility of switching the connection relationship between at least two battery packs.

[0041] In one embodiment, the charge / discharge mode selection circuit 6 includes a trigger switch S1; the first end of the trigger switch S1 is connected to the signal control terminal, and the second end of the trigger switch S1 is grounded, for outputting the charging control signal in a first trigger state and the discharging control signal in a second trigger state.

[0042] Optionally, the trigger switch S1 may be a mechanical switch, or an electronic or non-mechanical contact switch.

[0043] In this embodiment, the first terminal of the trigger switch S1 is connected to the signal control terminal, and the second terminal of the trigger switch S1 is grounded. It is used to output the charging control signal in the first trigger state and the discharging control signal in the second trigger state. This method has low cost and simple structure.

[0044] In one embodiment, the charge / discharge control circuit further includes a fourth switching circuit 5; the first terminal of the fourth switching circuit 5 is coupled to the positive terminal B+, and the second terminal of the fourth switching circuit 5 is coupled to the positive terminal of each battery pack; or, the first terminal of the fourth switching circuit 5 is coupled to the negative terminal B-, and the second terminal of the fourth switching circuit 5 is coupled to the negative terminal of each battery pack; the control chip U1 is connected to the control terminal of the fourth switching circuit 5, and is used to disconnect the fourth switching circuit 5 when any of the first switching circuits 2, any of the second switching circuits 3, or any of the third switching circuits 4 malfunctions.

[0045] As an example, the control chip U1 detects whether any of the first switch circuits 2, any of the second switch circuits 3, or any of the third switch circuits 4 are malfunctioning, such as conduction malfunction or disconnection malfunction. If so, it disconnects the fourth switch circuit 5, thereby disconnecting the charging and discharging circuit and ensuring safety during the charging and discharging process.

[0046] As an example, the fourth switching circuit 5 includes a fourth relay. The control chip U1 is connected to the coil of the fourth relay. The first end of the contact switch of the fourth relay is coupled to the positive terminal B+, and the second end of the contact switch is coupled to the positive terminal of each battery pack; or the first end of the contact switch is coupled to the negative terminal B-, and the second end of the contact switch is coupled to the negative terminal of each battery pack. The control chip U1 controls the conduction or disconnection of the contact switch by energizing or de-energizing the coil of the fourth relay, thereby disconnecting the charging and discharging circuit when any of the first switching circuits 2, any of the second switching circuits 3, or any of the third switching circuits 4 malfunctions, ensuring safety during the charging and discharging process.

[0047] In one embodiment, the control chip U1 includes a control terminal and a detection terminal; the first switching circuit 2 includes a first relay; the second switching circuit 3 includes a second relay; the third switching circuit 4 includes a third relay; the control terminal of the control chip U1 is connected to the coil of each of the first relays, the coil of each of the second relays, and the coil of each of the third relays; the detection terminal of the control chip U1 is connected to the contact switch of each of the first relays, the contact switch of each of the second relays, and the contact switch of each of the third relays, so as to disconnect the fourth switching circuit 5 when the switching voltage of any of the contact switches is abnormal.

[0048] As an example, such as Figure 1As shown, battery module 1 includes four battery packs. Control chip U1 has control terminals A0 to A9 and detection terminals B1 to B8. The first relay includes relays 1, 2, and 3. The second relay includes relays 7, 8, and 9. The third relay includes relays 4, 5, and 6. The fourth switching circuit 5 includes a fourth relay, which includes relay 10. Exemplarily, relay 1 includes a coil K1-1 and a contact switch K1. Relay 2 includes a coil K2-1 and a contact switch K2. Relay 3 includes a coil K3-1 and a contact switch K3. Relay 4 includes a coil K4-1 and a contact switch K4. Relay 5 includes a coil K5-1 and a contact switch K5. Relay 6 includes a coil K6-1 and a contact switch K6. Relay 7 includes a coil K7-1 and a contact switch K7. Relay 8 includes a coil K8-1 and a contact switch K8. Relay 9 includes a coil K9-1 and a contact switch K9. The relay 10 includes a coil K0-1 and a contact switch K0.

[0049] Specifically, when battery module 1 is charging, there is no current in control terminals A1, A2, A3, A7, A8, and A9 of control chip U1, and no current flows through coils K1-1, K2-1, K3-1, K7-1, K8-1, and K9-1. Contact switches K1, K2, K3, K7, K8, and K9 are open. Current flows through control terminals A4, A5, and A6 of control chip U1, and current flows through coils K4-1, K5-1, and K6-1. Contact switches K4, K5, and K1 are closed. When control chip U1 detects through detection terminals B1 to B8 that the voltage across contact switches K1 to K9 meets the conduction or disconnection conditions and maintains this for 20ms, control terminal A0 of control chip U1 outputs current, controlling contact switch K0 to close the main switch. At this time, the four battery packs are connected in series. The rated voltage of battery module 1 is 1600V and the rated current is 50A.

[0050] When battery module 1 discharges, control chip U1 controls coils K1-1, K2-1, K3-1, K7-1, K8-1, and K9-1 to generate current, causing contact switches K1, K2, K3, K7, K8, and K9 to close, while coils K4-1, K5-1, and K6-1 receive no current, and contact switches K4, K5, and K1 open. When control chip U1 detects through detection terminals B1 to B8 that the voltage across contact switches K1 to K9 meets the conduction or disconnection conditions and maintains this for 20ms, control chip U1 outputs current at control terminal A0, controlling the main switch K0 to close. At this time, the four battery packs are connected in parallel, and the rated voltage of battery module 1 is 400V and the rated current is 200A.

[0051] In this embodiment, the control chip U1 includes a control terminal and a detection terminal; the first switching circuit 2 includes a first relay; the second switching circuit 3 includes a second relay; the third switching circuit 4 includes a third relay; the control terminal of the control chip U1 is connected to the coil of each of the first relays, the coil of each of the second relays, and the coil of each of the third relays; the detection terminal of the control chip U1 is connected to the contact switch of each of the first relays, the contact switch of each of the second relays, and the contact switch of each of the third relays, so as to disconnect the fourth switching circuit 5 when the switching voltage of any of the contact switches is abnormal, so as to ensure safety during the charging and discharging process.

[0052] In one embodiment, the charge / discharge control circuit further includes a first indicator LED1; the first indicator LED1 is connected to the control chip U1 and a ground terminal, and is used to operate when the battery pack is charging. In this embodiment, when the charge / discharge control signal is a charging control signal, the control chip U1 controls the first indicator LED1 to operate, so as to indicate that the charge / discharge control circuit enters the charging mode.

[0053] In one embodiment, the charge / discharge control circuit further includes a second indicator LED2; the second indicator LED2 is connected to the control chip U1 and the ground terminal, and is used to operate when the battery pack is discharging. In this embodiment, when the charge / discharge control signal is a discharge control signal, the control chip U1 controls the second indicator LED2 to operate, so as to indicate that the charge / discharge control circuit enters the discharge mode.

[0054] Furthermore, the first indicator LED1 and the second indicator LED2 are different colors to distinguish between charging and discharging modes.

[0055] This embodiment provides a vehicle including the above-described charging and discharging control circuit.

[0056] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A charge-discharge control circuit characterized by comprising: It includes a battery module, a first switching circuit, a second switching circuit, a third switching circuit, and a control chip; The battery module includes at least two battery packs; the positive terminal of each battery pack is used to connect to the positive terminal connection, and the negative terminal of each battery pack is used to connect to the negative terminal connection. A first switching circuit is provided between the positive terminals of any two adjacent battery packs; A second switching circuit is provided between the negative terminals of any two adjacent battery packs; Each of the battery packs is connected in parallel with one of the third switching circuits; The control chip is connected to the first switch circuit, the second switch circuit, and the third switch circuit, and is used to connect to the signal control terminal to receive the charge and discharge control signal output by the signal control terminal, and to control the first switch circuit, the second switch circuit, and the third switch circuit to work according to the charge and discharge control signal.

2. The charge and discharge control circuit according to claim 1, characterized by, When the charge / discharge control signal is a charging control signal, each of the first switch circuits is disconnected, each of the second switch circuits is disconnected, and each of the third switch circuits is turned on; when the charge / discharge control signal is a discharging control signal, each of the first switch circuits is turned on, each of the second switch circuits is turned on, and each of the third switch circuits is disconnected.

3. The charge and discharge control circuit according to claim 2, characterized by, The charge / discharge control circuit also includes a speaker connected to the control chip. The speaker is used when the charge / discharge control signal is a charging control signal and each of the first switch circuits is turned on, each of the second switch circuits is turned on, and each of the third switch circuits is turned off, or when the charge / discharge control signal is a discharging control signal and each of the first switch circuits is turned off, each of the second switch circuits is turned off, and each of the third switch circuits is turned on.

4. The charge and discharge control circuit according to claim 2, characterized by, The charging and discharging control circuit further includes a charging and discharging mode selection circuit; the first terminal of the mode switching circuit is connected to the signal control terminal, and the second terminal of the mode switching circuit is grounded, for outputting the charging control signal or the discharging control signal to the signal control terminal.

5. The charge and discharge control circuit according to claim 4, characterized by The charging / discharging mode selection circuit includes a trigger switch; the first terminal of the trigger switch is connected to the signal control terminal, and the second terminal of the trigger switch is grounded, for outputting the charging control signal in the first trigger state; In the second trigger state, the discharge control signal is output.

6. The charge and discharge control circuit according to claim 1, wherein The charge / discharge control circuit also includes a fourth switching circuit. The first end of the fourth switching circuit is coupled to the positive terminal, and the second end of the fourth switching circuit is coupled to the positive terminal of each battery pack; or, the first end of the fourth switching circuit is coupled to the negative terminal, and the second end of the fourth switching circuit is coupled to the negative terminal of each battery pack. The control chip is connected to the control terminal of the fourth switching circuit and is used to disconnect the fourth switching circuit when any of the first switching circuits, any of the second switching circuits, or any of the third switching circuits malfunctions.

7. The charge and discharge control circuit according to claim 6, wherein The control chip includes a control terminal and a detection terminal; the first switching circuit includes a first relay; the second switching circuit includes a second relay; the third switching circuit includes a third relay; The control terminal of the control chip is connected to the coil of each of the first relays, the coil of each of the second relays, and the coil of each of the third relays. The detection terminal of the control chip is connected to the contact switch of each of the first relays, the contact switch of each of the second relays, and the contact switch of each of the third relays, so as to disconnect the fourth switching circuit when the switching voltage of any of the contact switches is abnormal.

8. The charge and discharge control circuit according to claim 1, wherein The charging and discharging control circuit also includes a first indicator light; the first indicator light is connected to the control chip and the ground terminal, and is used to operate when the battery pack is charging.

9. The charge and discharge control circuit according to claim 8, characterized by, The charge / discharge control circuit also includes a second indicator light; the second indicator light is connected to the control chip and the ground terminal, and is used to operate when the battery pack is discharging.

10. A vehicle characterized by comprising: Includes the charge / discharge control circuit as described in any one of claims 1 to 9.

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