Charging and discharging control device, battery pack and electronic equipment

Abstract

The utility model discloses a charging and discharging control device, a battery pack and electronic equipment, and the charging and discharging control device comprises a protection circuit which is connected with a battery cell module and a charging port, and is used for receiving the charging voltage of the charging port and transmitting the charging voltage to the battery cell module; the switching circuit is connected with the protection circuit and grounded; and the control circuit is connected with the control end of the switching circuit, and is used for controlling the switching circuit to be switched on when the charging voltage is greater than a preset value, so that the protection circuit converts the charging voltage into fusing current, and further the connection between the battery cell module and the charging port is disconnected. The stability of the charge-discharge control device can be improved, and the cost of the charge-discharge control device can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of energy storage, and particularly to a charge and discharge control device, a battery pack, and an electronic device. Background Art

[0002] Existing battery packs generally control the charging process by setting a charging MOS transistor on the charging circuit, and need to use a chip with a high-side driver in cooperation with a microprocessor, or a chip integrating a high-side driver and a microprocessor to control the on-off of the charging process.

[0003] Therefore, the selection of the charging MOS transistor is relatively limited, resulting in a high cost and poor stability of the charging control of the battery pack. Summary of the Utility Model

[0004] In view of this, this application provides a charge and discharge control device, a battery pack, and an electronic device, which are used to reduce the cost of charging control and improve the stability of charging control. The technical solution of this application is as follows:

[0005] In the first aspect of this application, a charge and discharge control device is provided, including: a protection circuit, the protection circuit is respectively connected to the battery cell module and the charging port, and is used to receive the charging voltage of the charging port and transmit the charging voltage to the battery cell module; a switching circuit, the switching circuit is connected to the protection circuit and grounded; a control circuit, the control circuit is connected to the control end of the switching circuit, and is used to control the switching circuit to conduct when the charging voltage is greater than a preset value, so that the protection circuit converts the charging voltage into a fusing current, and then disconnects the connection between the battery cell module and the charging port.

[0006] In an embodiment of this application, the protection circuit includes a three-terminal fuse, the first end of the three-terminal fuse is used to connect to the battery cell module, the second end of the three-terminal fuse is used to connect to the charging port, and the third end of the three-terminal fuse is used to connect to the switching circuit.

[0007] In an embodiment of this application, the switching circuit includes a switching transistor, a first resistor, and a second resistor; the first end of the switching transistor is connected to the protection circuit, the second end of the switching transistor is grounded, and the control end of the switching transistor is connected to the control circuit through the first resistor; the first end of the second resistor is connected to the control end of the switching transistor, and the second end of the second resistor is grounded.

[0008] In an embodiment of this application, the switching transistor includes a MOS transistor, the first end of the switching transistor is the drain of the MOS transistor, the second end of the switching transistor is the source of the MOS transistor, and the control end of the switching transistor is the gate of the MOS transistor.

[0009] In an embodiment of the present application, the charge and discharge control device further includes a first voltage detection circuit; the first voltage detection circuit is connected to the charging port and the control circuit, and the first voltage detection circuit is configured to detect the charging voltage of the charging port and transmit it to the control circuit; the control circuit is configured to control the switch circuit to turn on when it determines that the charging voltage is greater than a first preset value.

[0010] In an embodiment of the present application, the charge and discharge control device further includes a second voltage detection circuit; the second voltage detection circuit is connected to the battery cell module and the control circuit, and the second voltage detection circuit is configured to detect the voltage of each battery cell in the battery cell module and transmit it to the control circuit; the control circuit is configured to control the switch circuit to turn on when it determines that any one of the battery cell voltages is greater than a second preset value.

[0011] In an embodiment of the present application, the control circuit is further configured to control the switch circuit to turn on when it determines that the charging voltage is greater than a target value, and the target value is a preset multiple of any one of the battery cell voltages.

[0012] A second aspect of the present application provides a battery pack, including a battery cell module, a charging port, and the above-mentioned charge and discharge control device.

[0013] In an embodiment of the present application, it includes a power board and a main control board. The power board includes the charging port and the protection circuit, and the main control board includes the switch circuit and the control circuit.

[0014] A third aspect of the present application provides an electronic device, including the above-mentioned battery pack.

[0015] The charge and discharge control device of the embodiment of the present application, by setting the protection circuit and the switch circuit, when the control circuit determines that the charging voltage is greater than the preset value, that is, when the charging voltage is too high, the control circuit controls the switch circuit to turn on, so that the charging voltage is grounded through the protection circuit, thereby enabling the protection circuit to generate a large fusing current through grounding, and further enabling the protection circuit to disconnect the connection between the battery cell module and the charging port, achieving the effect of protecting the battery cell module, improving the stability of the charge and discharge control device, and reducing its cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic block diagram of a charge and discharge control device provided by an embodiment of the present application.

[0017] Figure 2 is a schematic block diagram of a charge and discharge control device provided by an embodiment of the present application.

[0018] Figure 3 is a schematic block diagram of a charge and discharge control device provided by an embodiment of the present application. Detailed implementation manners

[0019] It should be noted that, in the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more than two. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B may be singular or plural. Terms such as "first", "second", "third", "fourth", etc. (if any) in the specification, claims and drawings of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0020] In addition, it should be noted that the methods disclosed in the embodiments of the present application or the methods shown in the flowcharts include one or more steps for implementing the methods. Without departing from the scope of the claims, the execution order of multiple steps can be interchanged with each other, and some steps can also be deleted.

[0021] Existing battery packs generally control the charging process by setting a charging MOS transistor on the charging circuit, and need to use a chip with a high-side driver in cooperation with a microprocessor, or a chip integrating a high-side driver and a microprocessor to control the on-off of the charging process.

[0022] Therefore, the selection of the charging MOS transistor is relatively limited, resulting in a high cost of charging control of the battery pack and poor stability.

[0023] The present application provides a charge-discharge control device, a battery pack and an electronic device, which are used to reduce the cost of charging control and improve the stability of charging control.

[0024] Please refer to Figure 1 , Figure 1 FIG. 22 is a schematic block diagram of a charge-discharge control device 100a provided by an embodiment of the present application. Among them, the charge-discharge control device 100a includes a protection circuit 110, a switching circuit 120 and a control circuit 130. The charge-discharge control circuit 130 of the embodiment of the present application can be applied to the battery pack 10, and the battery pack 10 may include a battery cell module 101 composed of multiple battery cells, a charging port 102 and a discharging port.

[0025] Among them, the battery cell module 101 is respectively connected to the charging port 102 and the discharging port. After the battery pack 10 is connected to the power supply through the charging port 102, it can receive the charging voltage of the power supply through the charging port 102 and transmit it to the battery cell module 101 to charge the battery cell module 101. The battery pack 10 can also be connected to the load through the discharging port, and the battery cell module 101 can output a voltage to supply power to the load through the discharging port.

[0026] In the embodiment of the present application, the protection circuit 110 is respectively connected to the battery cell module 101 and the charging port 102, and is configured to receive the charging voltage of the charging port 102 and transmit the charging voltage to the battery cell module 101. The switch circuit 120 is connected to the protection circuit 110 and grounded. The control circuit 130 is connected to the control end of the switch circuit 120, and is configured to control the switch circuit 120 to conduct when the charging voltage is greater than a preset value, so that the protection circuit 110 converts the charging voltage into a fusing current, and then disconnects the connection between the battery cell module 101 and the charging port 102.

[0027] It can be understood that in the charge-discharge control device 100a of the embodiment of the present application, by setting the protection circuit 110 and the switch circuit 120, when the control circuit 130 determines that the charging voltage is greater than the preset value, that is, when the charging voltage is too high, the control circuit 130 controls the switch circuit 120 to conduct, so that the charging voltage is grounded after passing through the protection circuit 110, so that the protection circuit 110 generates a large fusing current through grounding, and then the protection circuit 110 disconnects the connection between the battery cell module 101 and the charging port 102, achieving the effect of protecting the battery cell module 101, improving the stability of the charge-discharge control device 100a and reducing its cost.

[0028] In some embodiments, the above protection circuit 110 includes a three-terminal fuse. The first end of the three-terminal fuse is used to connect to the battery cell module 101, the second end of the three-terminal fuse is used to connect to the charging port 102, and the third end of the three-terminal fuse is used to connect to the switch circuit 120.

[0029] In some embodiments, as Figure 2 shown, the switch circuit 110 in the charge-discharge control device 100a includes a switching transistor Q1, a first resistor R1, and a second resistor R2. Among them, the first end of the switching transistor Q1 is connected to the protection circuit, the second end of the switching transistor Q1 is grounded, and the control end of the switching transistor Q1 is connected to the control circuit through the first resistor R1; the first end of the second resistor R2 is connected to the control end of the switching transistor Q1, and the second end of the second resistor R2 is grounded.

[0030] In the embodiment of the present application, the switching transistor Q1 includes a MOS transistor (MOS, Metal-Oxide-Semiconductor Field-Effect Transistor), the first end of the switching transistor Q1 is the drain of the MOS transistor, the second end of the switching transistor Q1 is the source of the MOS transistor, and the control end of the switching transistor Q1 is the gate of the MOS transistor.

[0031] Please refer to Figure 3 , Figure 3Schematic block diagram of a charge and discharge control device 100b provided by an embodiment of the present application. Compared with the charge and discharge control device 100a, the charge and discharge control device 100b further includes: a first voltage detection circuit 140 and a second voltage detection circuit 150.

[0032] Among them, the first voltage detection circuit 140 is connected to the charging port 102 and the control circuit 130. The first voltage detection circuit 140 is used to detect the charging voltage of the charging port 102 and transmit it to the control circuit 130. The control circuit 130 is used to control the switch circuit to conduct when it determines that the charging voltage is greater than a first preset value. Among them, this first preset value can be set before the battery pack 10 leaves the factory. For example, it can be 1.2 times the rated voltage of the battery cell, etc., and is not limited here.

[0033] Alternatively, the second voltage detection circuit 150 is connected to the battery cell module and the control circuit 130. The second voltage detection circuit 150 is used to detect the voltage of each battery cell in the battery cell module 101 and transmit it to the control circuit 130. The control circuit 130 is used to control the switch circuit 120 to conduct when it determines that the voltage of any one battery cell is greater than a second preset value. That is, the control circuit 130 controls the switch circuit 120 to conduct when it determines that at least one battery cell is in an overvoltage state.

[0034] In some embodiments, the control circuit 130 is further used to control the switch circuit 120 to conduct when it determines that the charging voltage is greater than a target value, and the target value is a preset multiple of the voltage of any one battery cell. For example, this preset multiple can be 1.2 times, etc., and is not limited here to avoid damage to the battery cell due to excessive charging current.

[0035] The embodiment of the present application also provides a battery pack, including a battery cell module, a charging port, and the charge and discharge control device in any of the above embodiments. And it also provides an electronic device, including the battery pack in the above embodiment. It can be understood that the beneficial effects of the battery pack and the electronic device in the embodiment of the present application can refer to the corresponding beneficial effects of the charge and discharge control device in the foregoing embodiments, and will not be elaborated here.

[0036] The above-described embodiments are only described in terms of the preferred embodiments of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present application shall fall within the protection scope determined by the claims of the present application.

Claims

1. A charge and discharge control device, characterized in that: include: A protection circuit, the protection circuit comprising a three-terminal fuse, a first end of the three-terminal fuse being used to connect to a battery module, and a second end of the three-terminal fuse being used to connect to a charging port, for receiving a charging voltage from the charging port, and transmitting the charging voltage to the battery module; A switch circuit, the switch circuit comprising a switch tube, a first resistor and a second resistor, the first end of the switch tube is connected to the protection circuit, the second end of the switch tube is grounded, and the control end of the switch tube is connected to the control circuit through the first resistor; the first end of the second resistor is connected to the control end of the switch tube, and the second end of the second resistor is grounded; A control circuit, wherein the control circuit is connected to the control end of the switch circuit and is used to control the switch circuit to be turned on when the charging voltage is greater than a preset value, so that the protection circuit converts the charging voltage into a fuse current, thereby disconnecting the connection between the battery module and the charging port.

2. The charge and discharge control device according to claim 1, characterized in that: The three-terminal fuse also includes a third terminal, and the third terminal of the three-terminal fuse is used to connect the switch circuit.

3. The charge and discharge control device according to claim 1, characterized in that: The switch tube comprises a MOS tube, the first end of the switch tube is the drain of the MOS tube, the second end of the switch tube is the source of the MOS tube, and the control end of the switch tube is the gate of the MOS tube.

4. The charge and discharge control device according to claim 1, characterized in that: The charge and discharge control device also includes a first voltage detection circuit; The first voltage detection circuit is connected to the charging port and the control circuit, and the first voltage detection circuit is used to detect the charging voltage of the charging port and transmit it to the control circuit; The control circuit is used to control the switch circuit to be turned on when it is determined that the charging voltage is greater than a first preset value.

5. The charge and discharge control device according to claim 4, characterized in that: The charge and discharge control device also includes a second voltage detection circuit; The second voltage detection circuit is connected to the battery cell module and the control circuit, and is used to detect the battery cell voltage of each battery cell in the battery cell module and transmit it to the control circuit; The control circuit is used to control the switch circuit to conduct when it is determined that the voltage of any one of the battery cells is greater than a second preset value.

6. The charge and discharge control device according to claim 5, characterized in that: The control circuit is further used to control the switch circuit to conduct when it is determined that the charging voltage is greater than a target value, and the target value is a preset multiple of any one of the battery cell voltages.

7. A battery pack, characterized in that: It comprises a battery cell module, a charging port and a charge and discharge control device as claimed in any one of claims 1 to 6.

8. The battery pack according to claim 7, characterized in that: It includes a power board and a main control board, the power board includes the charging port and the protection circuit, and the main control board includes the switch circuit and the control circuit.

9. An electronic device, characterized in that: Comprising a battery pack as claimed in claim 7 or 8.

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