Overcurrent protection circuit, battery module and electric equipment

Abstract

The utility model provides an over-current protection circuit, a battery module and electric equipment, and belongs to the technical field of charging and discharging, the over-current protection circuit comprises a protection module connected to a main loop of the battery module, the protection module comprises a plurality of over-current protection devices; the detection module is connected with the protection module, and the detection module is used for obtaining circuit parameters representing whether the overcurrent protection device is disconnected or not; the control module is connected with the protection module and the detection module, and the control module is used for determining whether the overcurrent protection devices are disconnected or not according to the circuit parameters, and determining whether the overcurrent protection devices are disconnected or not when a first target device in the overcurrent protection devices fails to be disconnected. And controlling a second target device in the over-current protection devices to disconnect the main loop.

Description

Technical Field

[0001] The present disclosure relates to the field of battery safety, and in particular to an overcurrent protection circuit, a battery module, and an electrical device. Background Art

[0002] In the field of battery module safety, the safety of high-voltage electrical systems is of vital importance. Major safety accidents such as arcing, ablation, and even smoking and fire in high-voltage systems caused by overcurrent in the electrical system often occur in the industry, causing huge losses to users and seriously interfering with the development of the industry.

[0003] At present, when overcurrent protection is performed on battery modules, usually only one method is used to protect the battery modules from overcurrent, such as relays or fuses. However, in some scenarios, such as when the relay or fuse is disconnected for protection, the circuit cannot determine whether the circuit of the battery module is disconnected successfully, and there is no corresponding treatment measure when the protection fails. Utility Model Content

[0004] The embodiments of the present disclosure provide an overcurrent protection circuit, a battery module, and an electrical device, which can solve the problem of accurately judging whether the overcurrent protection is successful and how to deal with the problem of protection failure.

[0005] In a first aspect, an embodiment of the present application provides an overcurrent protection circuit, comprising:

[0006] A protection module connected to the main circuit of the battery module, wherein the protection module includes a plurality of overcurrent protection devices;

[0007] A detection module, connected to the protection module, and used to obtain circuit parameters indicating whether the overcurrent protection device is disconnected;

[0008] A control module is connected to the protection module and the detection module, and the control module is used to determine whether the overcurrent protection device is disconnected according to the circuit parameters, and, when the first target device among the multiple overcurrent protection devices fails to disconnect, control the second target device among the multiple overcurrent protection devices to disconnect the main circuit.

[0009] Optionally, the main circuit includes a positive main circuit and a negative main circuit, and the multiple overcurrent protection devices include a positive relay and a first overcurrent protection device connected to the positive main circuit, and a negative relay and a second overcurrent protection device connected to the negative main circuit;

[0010] The first overcurrent protection device is a fuse, and the second overcurrent protection device is an explosion fuse; or,

[0011] The first overcurrent protection device is an explosion fuse, and the second overcurrent protection device is a fuse.

[0012] Optionally, the detection module includes a first detection circuit, the first detection circuit is used to obtain a first parameter, and the first parameter is used to indicate whether the positive relay is disconnected;

[0013] The first detection circuit at least includes a first resistor, a first end of the first resistor is connected to a first end of the positive relay, and a second end of the first resistor is connected to the negative main circuit;

[0014] The second end of the positive relay is connected to the positive electrode of the battery module.

[0015] Optionally, the detection module includes a second detection circuit, the second detection circuit is used to obtain a second parameter, and the second parameter is used to indicate whether the negative relay is disconnected;

[0016] The second detection circuit at least comprises a second resistor, a first end of the second resistor is connected to a first end of the negative electrode relay, and a second end of the second resistor is connected to the positive electrode main circuit;

[0017] The second end of the negative electrode relay is connected to the negative electrode of the battery module.

[0018] Optionally, the detection module includes a first detection circuit and a third detection circuit, the first detection circuit is used to obtain a first parameter, the third detection circuit is used to obtain a third parameter, and the first parameter and the third parameter are also used to indicate whether the first overcurrent protection device is disconnected;

[0019] The third detection circuit at least includes a third resistor and a fourth resistor, a first end of the third resistor is connected to the first end of the first overcurrent protection device, a second end of the third resistor is connected to the first end of the fourth resistor, and a second end of the fourth resistor is connected to the first end of the second overcurrent protection device;

[0020] The second end of the first overcurrent protection device is connected to the first end of the positive relay;

[0021] The second end of the second overcurrent protection device is connected to the first end of the negative relay.

[0022] Optionally, the detection module includes a second detection circuit and a fourth detection circuit, the second detection circuit is used to obtain a second parameter, the fourth detection circuit is used to obtain a fourth parameter, and the fourth parameter and the second parameter are also used to indicate whether the second overcurrent protection device is disconnected;

[0023] The fourth detection circuit at least includes a fifth resistor and a fourth resistor, the first end of the fifth resistor is connected to the second end of the positive relay, the second end of the fifth resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the first end of the second overcurrent protection device;

[0024] The second end of the first overcurrent protection device is connected to the first end of the positive relay;

[0025] The second end of the second overcurrent protection device is connected to the first end of the negative relay.

[0026] Optionally, the detection module includes a first detection circuit, a second detection circuit, a third detection circuit and a fourth detection circuit, the first detection circuit is used to obtain the first parameter, the second detection circuit is used to obtain the second parameter, the third detection circuit is used to obtain the third parameter, and the fourth detection circuit is used to obtain the fourth parameter;

[0027] The first parameter is used to indicate whether the positive relay is disconnected;

[0028] The second parameter is used to indicate whether the negative relay is disconnected;

[0029] The first parameter and the third parameter are also used to characterize whether the first overcurrent protection device is disconnected;

[0030] The second parameter and the fourth parameter are also used to characterize whether the second overcurrent protection device is disconnected;

[0031] The first detection circuit at least includes a first resistor, a first end of the first resistor is connected to a first end of the positive relay, a second end of the first resistor is connected to the negative main circuit, and a second end of the positive relay is connected to the positive electrode of the battery module;

[0032] The second detection circuit at least includes a second resistor, a first end of the second resistor is connected to the first end of the negative electrode relay, a second end of the second resistor is connected to the positive electrode main circuit, and a second end of the negative electrode relay is connected to the negative electrode of the battery module;

[0033] The third detection circuit at least includes a third resistor and a fourth resistor, a first end of the third resistor is connected to the first end of the first overcurrent protection device, a second end of the third resistor is connected to the first end of the fourth resistor, and a second end of the fourth resistor is connected to the first end of the second overcurrent protection device;

[0034] The fourth detection circuit at least includes a fifth resistor, a first end of the fifth resistor is connected to the second end of the positive relay, and a second end of the fifth resistor is connected to the first end of the fourth resistor;

[0035] The second end of the first overcurrent protection device is connected to the first end of the positive relay;

[0036] The second end of the second overcurrent protection device is connected to the first end of the negative relay.

[0037] Optionally, the detection module further includes a first switch, a second switch and a third switch;

[0038] The first switch is arranged between the first end of the first resistor and the positive main loop;

[0039] The second switch is arranged between the second end of the second resistor and the positive main circuit, and the fifth resistor is connected to the second end of the positive relay through the second switch;

[0040] The third switch is arranged between the first end of the third resistor and the positive main loop.

[0041] Optionally, the circuit is used to implement at least one of the following working modes under the control of the control module:

[0042] A first working mode; corresponding to the first working mode, the positive relay and the negative relay are disconnected, the first switch and the second switch are closed, and the third switch is disconnected;

[0043] A second working mode, corresponding to the second working mode, triggering the first overcurrent protection device, the first switch and the third switch are closed, and the second switch is opened;

[0044] The third working mode corresponds to the third working mode, the second overcurrent protection device is triggered, the second switch is closed, and the first switch and the third switch are opened.

[0045] In a second aspect, an embodiment of the present application provides a battery module, comprising an overcurrent protection circuit as described in any one of the first aspects.

[0046] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery module and an overcurrent protection circuit as described in any one of the first aspects.

[0047] One beneficial effect of the disclosed embodiment is that the protection module of the overcurrent protection circuit is connected to the main circuit of the battery module, and includes a variety of overcurrent protection devices. The detection module is connected to the protection module, and can obtain parameters that characterize whether the overcurrent protection device is disconnected. The circuit also includes a control module, which is connected to the protection module and the detection module, and is used to detect whether the device is disconnected and protect the main circuit of the battery module through the second target device when the first target device among the multiple overcurrent protection devices fails to disconnect. Improve the safety of the battery module in various scenarios.

[0048] Other features and advantages of the embodiments of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the embodiments of the present disclosure.

[0050] Figure 1 A structural block diagram of an overcurrent protection circuit according to an embodiment of the present disclosure is shown.

[0051] Figure 2 A schematic diagram showing an example of an overcurrent protection circuit according to an embodiment of the present disclosure.

[0052] Figure 3 A schematic diagram showing an example of an overcurrent protection circuit according to an embodiment of the present disclosure.

[0053] Description of reference numerals:

[0054] Overcurrent protection circuit 1000; protection module 1001; detection module 1002; control module 1003;

[0055] A first resistor R1; a second resistor R2; a third resistor R3; a fourth resistor R4; a fifth resistor R5; a sixth resistor R6; a seventh resistor R7; an eighth resistor R8; a ninth resistor R9; and a tenth resistor R10;

[0056] A first switch S1; a second switch S2; a third switch S3;

[0057] Battery module 100; first detection circuit 110; second detection circuit 120; third detection circuit 130; fourth detection circuit 140;

[0058] Positive pole relay K1; negative pole relay K2; first overcurrent protection device K3; fourth overcurrent protection device K4. DETAILED DESCRIPTION

[0059] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0060] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0061] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0062] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0063] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0064] like Figure 1 As shown, an embodiment of the present application introduces an overcurrent protection circuit 1000, including: a protection module 1001, connected to the main circuit of the battery module, the protection module 1001 including a plurality of overcurrent protection devices; a detection module 1002, connected to the protection module 1001, the detection module 1002 is used to obtain circuit parameters characterizing whether the overcurrent protection device is disconnected; a control module 1003, connected to the protection module 1001 and the detection module 1002, the control module 1003 is used to determine whether the overcurrent protection device is disconnected according to the circuit parameters, and, in the event that the first target device among the plurality of overcurrent protection devices fails to disconnect, control the second target device among the plurality of overcurrent protection devices to disconnect the main circuit.

[0065] In this embodiment, the main circuit of the battery module may include a positive main circuit connected to the positive electrode of the battery module and a negative main circuit connected to the negative electrode of the battery module. The other end of the main circuit may be connected to a battery load, which is not limited here.

[0066] In an example of this embodiment, the main circuit includes a positive main circuit and a negative main circuit, and the multiple overcurrent protection devices include a positive relay K1 and a first overcurrent protection device K3 connected to the positive main circuit, and a negative relay K2 and a second overcurrent protection device K4 connected to the negative main circuit; the first overcurrent protection device K3 is a fuse, and the second overcurrent protection device K4 is an explosion fuse; or, the first overcurrent protection device K3 is an explosion fuse, and the second overcurrent protection device K4 is a fuse.

[0067] In this embodiment, the overcurrent protection circuit 1000 includes a protection module 1001. The protection module 1001 may include a variety of overcurrent protection devices, such as relays, fuses, and explosion fuses. In this embodiment, the various overcurrent protection devices of the protection module 1001 may be arranged on the main circuit of the battery module. Specifically, the relay may include a positive relay K1 arranged on the positive pole of the main circuit and a negative relay K2 arranged on the negative pole. The explosion fuse and the fuse are similarly arranged on the positive main circuit or the negative main circuit. In addition, the explosion fuse and the fuse may be arranged on the same side of the main circuit, or on both sides of the main circuit, such as Figure 2 As shown, no limitation is given here.

[0068] In an example of this embodiment, the detection module 1002 includes a first detection circuit; the first detection circuit is used to obtain a first parameter, and the first parameter is used to characterize whether the positive relay K1 is disconnected. The first detection circuit at least includes a first resistor, a first end of the first resistor is connected to the first end of the positive relay K1, and a second end of the first resistor is connected to the negative main circuit; the second end of the positive relay K1 is connected to the positive electrode of the battery module.

[0069] like Figure 2 As shown, the second end of the positive relay K1 is connected to the positive electrode of the battery module, and the first end is connected to a subsequent circuit, such as a battery load. The detection module 1002 includes a first detection circuit, and the first detection circuit includes at least a first resistor R1, and the first end of the first resistor R1 is connected to the first end of the positive relay K1. The first detection circuit can be used to obtain a first parameter characterizing whether the positive relay K1 is open or closed. Specifically, the first parameter can be the voltage of the first resistor R1.

[0070] In an example of this embodiment, the detection module 1002 includes a second detection circuit, which is used to obtain a second parameter, and the second parameter is used to characterize whether the negative pole relay K2 is disconnected. The second detection circuit at least includes a second resistor, and the first end of the second resistor is connected to the first end of the negative pole relay K2, and the second end of the second resistor is connected to the positive pole main circuit; the second end of the negative pole relay K2 is connected to the negative pole of the battery module.

[0071] like Figure 2 As shown, similar to the positive relay K1, the second end of the negative relay K2 is connected to the negative electrode of the battery module, and the first end is connected to the subsequent circuit, such as the battery load. The detection module 1002 includes a second detection circuit, and the second detection circuit includes at least a second resistor R2, and the first end of the second resistor R2 is connected to the first end of the negative relay K2. The second detection circuit can be used to obtain a second parameter characterizing whether the negative relay K2 is open or closed. Specifically, the second parameter can be the voltage of the second resistor R2.

[0072] In an example of this embodiment, the detection module 1002 includes a first detection circuit and a third detection circuit, the first detection circuit is used to obtain a first parameter, and the third detection circuit is used to obtain a third parameter, and the first parameter and the third parameter are also used to characterize whether the first overcurrent protection device K3 is disconnected; the third detection circuit includes at least a third resistor and a fourth resistor, the first end of the third resistor is connected to the first end of the first overcurrent protection device K3, the second end of the third resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the first end of the second overcurrent protection device K4; the second end of the first overcurrent protection device K3 is connected to the first end of the positive relay K1; the second end of the second overcurrent protection device K4 is connected to the first end of the negative relay K2.

[0073] like Figure 2 As shown, the second end of the first overcurrent protection device K3 is connected to the positive relay K1, the first end of the first overcurrent protection device K3 is connected to the first end of the third resistor R3, the second end of the second overcurrent protection device K4 is connected to the negative relay K2, the first end of the second overcurrent protection device is connected to the second end of the fourth resistor R4, the third resistor and the fourth resistor are connected in series, and the third detection circuit and the first detection circuit can be used to obtain the first parameter and the third parameter that characterize whether the first overcurrent protection device K3 is open or closed. Specifically, it can be the voltage of the first resistor R1 and the third resistor R3.

[0074] In an example of this embodiment, the detection module 1002 includes a second detection circuit and a fourth detection circuit, the second detection circuit is used to obtain a second parameter, the fourth detection circuit is used to obtain a fourth parameter, and the fourth parameter and the second parameter are also used to characterize whether the second overcurrent protection device K4 is disconnected; the fourth detection circuit includes at least a fifth resistor and a fourth resistor, the first end of the fifth resistor is connected to the second end of the positive relay K1, the second end of the fifth resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the first end of the second overcurrent protection device K4; the second end of the first overcurrent protection device K3 is connected to the first end of the positive relay K1; the second end of the second overcurrent protection device K4 is connected to the first end of the negative relay K2.

[0075] like Figure 2 , the first end of the fifth resistor R5 is connected to the second end of the positive relay K1, and the second end of the fifth resistor R5 is connected to the first end of the fourth resistor. The fourth detection circuit and the second detection circuit can be used to obtain a parameter characterizing whether the second overcurrent protection device K4 is open or closed. Specifically, it can be the voltage between the second resistor R2 and the fifth resistor R5.

[0076] In an example of this embodiment, sensors may be further provided in the first detection circuit, the second detection circuit, the third detection circuit, and the fourth detection circuit in the detection module 1002 to collect the voltages of the first resistor, the second resistor, the third resistor, and the fifth resistor, i.e., V1-V4 in the figure. The sensors may be connected to the control module 1003.

[0077] In an example of this embodiment, other voltage-dividing resistors may be provided in the first detection circuit, the second detection circuit, the third detection circuit, and the fourth detection circuit in the detection module 1002 to prevent the main circuit current from being too large, causing V1-V4 to exceed the range. Figure 3 As shown, a resistor R6 may be further provided in the first detection circuit, resistors R7 and R8 may be provided in the second detection circuit, a resistor R9 may be provided in the third detection circuit, and a resistor R10 may be provided in the fourth detection circuit.

[0078] In an example of this embodiment, the control module 1003 is also used to: obtain the voltage values ​​of the first resistor, the second resistor, the third resistor and the fifth resistor; determine whether the positive relay K1 is disconnected according to the voltage value of the first resistor; determine whether the negative relay K2 is disconnected according to the voltage value of the second resistor; determine whether the first overcurrent protection device K3 is disconnected according to the voltage values ​​of the first resistor and the third resistor; determine whether the second overcurrent protection device K4 is disconnected according to the voltage values ​​of the second resistor and the fifth resistor.

[0079] In this embodiment, the control module 1003 may include a battery management system BMS, and the BMS may collect the voltage values ​​of the first resistor, the second resistor, the third resistor, and the fifth resistor to determine whether the overcurrent protection device is disconnected. Figure 2 As shown, in the first detection circuit, the voltage V1 of the first resistor R1 can be collected, and the equivalent resistance of the positive relay K1 can be determined according to the formula V1 / Vtotal=R1 / (R1+r), so as to determine whether the positive relay K1 is disconnected, where Vtotal is the voltage across the battery module and r is the resistance value of the relay. When the value of r is small, it can be determined that the positive relay K1 has failed to disconnect. The same is true for the negative relay K2. When determining whether the first overcurrent protection device K3 is disconnected, it can be determined by the voltage values ​​of the first resistor and the third resistor. For example, Figure 2 As shown, it is possible to calculate whether the voltages at both ends of the first overcurrent protection device K3 are the same, that is, whether (V1 / R1)*R1 is equal to (V4 / R3)*(R3+R4). If they are equal, it is proved that the first overcurrent protection device K3 is not disconnected. When determining whether the second overcurrent protection device K4 is disconnected, it can be determined by the voltage values ​​of the second resistor and the fifth resistor. For example, Figure 2As shown, it is possible to calculate whether the voltages across the second overcurrent protection device K4 are the same, that is, whether V2 is equal to (V3 / R5)*(R5+R4). If they are equal, it is proved that the second overcurrent protection device K4 is not disconnected.

[0080] In another example, Figure 3 As shown, whether the positive pole relay K1 is disconnected can be determined according to the formula V1 / Vtotal=R1 / (R1+R6+r). The same is true for the negative pole relay K2. Whether the first overcurrent protection device K3 is disconnected can be determined by whether (V1 / R1)*(R1+R6) is equal to (V4 / R3)*(R3+R4+R9). Whether the second overcurrent protection device K4 is disconnected can be determined by whether (V2 / R2)*(R2+R7+R8) is equal to (V3 / R5)*(R5+R4+R10).

[0081] In an example of this embodiment, the detection module 1002 includes a first detection circuit, a second detection circuit, a third detection circuit and a fourth detection circuit, the first detection circuit is used to obtain a first parameter, the second detection circuit is used to obtain a second parameter, the third detection circuit is used to obtain a third parameter, and the fourth detection circuit is used to obtain a fourth parameter; the first parameter is used to characterize whether the positive relay K1 is disconnected; the second parameter is used to characterize whether the negative relay K2 is disconnected; the first parameter and the third parameter are also used to characterize whether the first overcurrent protection device K3 is disconnected; the second parameter and the fourth parameter are also used to characterize whether the second overcurrent protection device K4 is disconnected. The first detection circuit includes at least a first resistor, the first end of the first resistor is connected to the first end of the positive relay K1, the second end of the first resistor is connected to the negative main circuit, and the second end of the positive relay K1 is connected to the positive electrode of the battery module; The second detection circuit at least includes a second resistor, a first end of the second resistor is connected to the first end of the negative pole relay K2, a second end of the second resistor is connected to the positive pole main circuit, and the second end of the negative pole relay K2 is connected to the negative pole of the battery module; the third detection circuit at least includes a third resistor and a fourth resistor, a first end of the third resistor is connected to the first end of the first overcurrent protection device K3, a second end of the third resistor is connected to the first end of the fourth resistor, and a second end of the fourth resistor is connected to the first end of the second overcurrent protection device K4; the fourth detection circuit at least includes a fifth resistor, a first end of the fifth resistor is connected to the second end of the positive pole relay K1, and the second end of the fifth resistor is connected to the first end of the fourth resistor; the second end of the first overcurrent protection device K3 is connected to the first end of the positive pole relay K1; the second end of the second overcurrent protection device K4 is connected to the first end of the negative pole relay K2.

[0082] In this embodiment, the detection module 1002 also includes a first switch S1, a second switch S2 and a third switch S3; the first switch S1 is arranged between the first end of the first resistor and the positive main circuit; the second switch S2 is arranged between the second end of the second resistor and the positive main circuit, and the fifth resistor is connected to the second end of the positive relay K1 through the second switch S2; the third switch S3 is arranged between the first end of the third resistor and the positive main circuit.

[0083] In an example of this embodiment, the circuit is used to implement at least one of the following operating modes under the control of the control module 1003: a first operating mode; corresponding to the first operating mode, the positive relay K1 and the negative relay K2 are disconnected, the first switch S1 and the second switch S2 are closed, and the third switch S3 is disconnected; a second operating mode, corresponding to the second operating mode, triggering the first overcurrent protection device K3, the first switch S1 and the third switch S3 are closed, and the second switch S2 is disconnected; a third operating mode, corresponding to the third operating mode, triggering the second overcurrent protection device K4, the second switch S2 is closed, and the first switch S1 and the third switch S3 are disconnected.

[0084] In one example, when the circuit is overcurrent protected by a relay, the control module 1003 can control the first switch S1 and the second switch S2 to close, so as to determine whether the positive relay K1 and the negative relay K2 are disconnected. When the positive relay K1 and the negative relay K2 are not disconnected, the control module 1003 can perform overcurrent protection in other ways, for example, by actively disconnecting the explosion insurance, or by performing current protection through a fuse. When the circuit is overcurrent protected by the first overcurrent protection device K3, the first switch S1 and the third switch S3 can be controlled to close to determine whether the first overcurrent protection device K3 is disconnected. When the first overcurrent protection device K3 fails to disconnect, overcurrent protection is performed in other ways. When the circuit is overcurrent protected by the second overcurrent protection device K4, the second switch S2 can be controlled to close to determine whether the second overcurrent protection device K4 is disconnected. When the second overcurrent protection device K4 fails to disconnect, overcurrent protection can also be performed in other ways. For example, the first overcurrent protection device K3 or a relay.

[0085] In this example, an overcurrent protection circuit 1000 is provided, wherein the protection module 1001 of the circuit is connected to the main circuit of the battery module, and includes a plurality of overcurrent protection devices. The detection module 1002 is connected to the protection module 1001, and can detect whether the overcurrent protection device is disconnected. The circuit also includes a control module 1003, which is connected to the protection module 1001 and the detection module 1002, and is used to control the first device among the plurality of overcurrent protection devices to disconnect and protect the main circuit of the battery module through the second device. The safety of the battery module in various scenarios is improved.

[0086] In an example of this embodiment, a battery module is also introduced, including the overcurrent protection circuit 1000 of any of the above embodiments.

[0087] In an example of this embodiment, an electric device is also introduced, including a battery module and the overcurrent protection circuit 1000 of any of the above embodiments, and can achieve the same technical effect. To avoid repetition, it is not described here. In this embodiment, the electric device can be a vehicle.

[0088] Each embodiment in the present disclosure is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device and equipment embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0089] The above embodiments mainly focus on describing the differences from other embodiments, but it should be clear to those skilled in the art that the above embodiments can be used alone or in combination with each other as needed.

[0090] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An overcurrent protection circuit, characterized in that: The overcurrent protection circuit comprises: A protection module connected to the main circuit of the battery module, wherein the protection module includes a plurality of overcurrent protection devices; A detection module, connected to the protection module, and used to obtain circuit parameters indicating whether the overcurrent protection device is disconnected; A control module is connected to the protection module and the detection module, and the control module is used to determine whether the overcurrent protection device is disconnected according to the circuit parameters, and, when the first target device among the multiple overcurrent protection devices fails to disconnect, control the second target device among the multiple overcurrent protection devices to disconnect the main circuit.

2. The circuit according to claim 1, characterized in that The main circuit includes a positive main circuit and a negative main circuit, and the multiple overcurrent protection devices include a positive relay and a first overcurrent protection device connected to the positive main circuit, and a negative relay and a second overcurrent protection device connected to the negative main circuit; The first overcurrent protection device is a fuse, and the second overcurrent protection device is an explosion fuse; or, The first overcurrent protection device is an explosion fuse, and the second overcurrent protection device is a fuse.

3. The circuit according to claim 2, characterized in that The detection module includes a first detection circuit, the first detection circuit is used to obtain a first parameter, and the first parameter is used to indicate whether the positive relay is disconnected; The first detection circuit at least includes a first resistor, a first end of the first resistor is connected to a first end of the positive relay, and a second end of the first resistor is connected to the negative main circuit; The second end of the positive relay is connected to the positive electrode of the battery module.

4. The circuit according to claim 2, characterized in that The detection module includes a second detection circuit, the second detection circuit is used to obtain a second parameter, and the second parameter is used to indicate whether the negative relay is disconnected; The second detection circuit at least comprises a second resistor, a first end of the second resistor is connected to a first end of the negative electrode relay, and a second end of the second resistor is connected to the positive electrode main circuit; The second end of the negative electrode relay is connected to the negative electrode of the battery module.

5. The circuit according to claim 2, characterized in that The detection module includes a first detection circuit and a third detection circuit, the first detection circuit is used to obtain a first parameter, the third detection circuit is used to obtain a third parameter, and the first parameter and the third parameter are also used to indicate whether the first overcurrent protection device is disconnected; The third detection circuit at least includes a third resistor and a fourth resistor, a first end of the third resistor is connected to the first end of the first overcurrent protection device, a second end of the third resistor is connected to the first end of the fourth resistor, and a second end of the fourth resistor is connected to the first end of the second overcurrent protection device; The second end of the first overcurrent protection device is connected to the first end of the positive relay; The second end of the second overcurrent protection device is connected to the first end of the negative relay.

6. The circuit according to claim 2, characterized in that The detection module includes a second detection circuit and a fourth detection circuit, the second detection circuit is used to obtain a second parameter, the fourth detection circuit is used to obtain a fourth parameter, and the fourth parameter and the second parameter are also used to indicate whether the second overcurrent protection device is disconnected; The fourth detection circuit at least includes a fifth resistor and a fourth resistor, the first end of the fifth resistor is connected to the second end of the positive relay, the second end of the fifth resistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the first end of the second overcurrent protection device; The second end of the first overcurrent protection device is connected to the first end of the positive relay; The second end of the second overcurrent protection device is connected to the first end of the negative relay.

7. The circuit according to claim 2, characterized in that The detection module includes a first detection circuit, a second detection circuit, a third detection circuit and a fourth detection circuit, the first detection circuit is used to obtain the first parameter, the second detection circuit is used to obtain the second parameter, the third detection circuit is used to obtain the third parameter, and the fourth detection circuit is used to obtain the fourth parameter; The first parameter is used to indicate whether the positive relay is disconnected; The second parameter is used to indicate whether the negative relay is disconnected; The first parameter and the third parameter are also used to characterize whether the first overcurrent protection device is disconnected; The second parameter and the fourth parameter are also used to characterize whether the second overcurrent protection device is disconnected; The first detection circuit at least includes a first resistor, a first end of the first resistor is connected to a first end of the positive relay, a second end of the first resistor is connected to the negative main circuit, and a second end of the positive relay is connected to the positive electrode of the battery module; The second detection circuit at least includes a second resistor, a first end of the second resistor is connected to the first end of the negative electrode relay, a second end of the second resistor is connected to the positive electrode main circuit, and a second end of the negative electrode relay is connected to the negative electrode of the battery module; The third detection circuit at least includes a third resistor and a fourth resistor, a first end of the third resistor is connected to the first end of the first overcurrent protection device, a second end of the third resistor is connected to the first end of the fourth resistor, and a second end of the fourth resistor is connected to the first end of the second overcurrent protection device; The fourth detection circuit at least includes a fifth resistor, a first end of the fifth resistor is connected to the second end of the positive relay, and a second end of the fifth resistor is connected to the first end of the fourth resistor; The second end of the first overcurrent protection device is connected to the first end of the positive relay; The second end of the second overcurrent protection device is connected to the first end of the negative relay.

8. The circuit according to claim 7, characterized in that The detection module also includes a first switch, a second switch and a third switch; The first switch is arranged between the first end of the first resistor and the positive main loop; The second switch is arranged between the second end of the second resistor and the positive main circuit, and the fifth resistor is connected to the second end of the positive relay through the second switch; The third switch is arranged between the first end of the third resistor and the positive main loop.

9. The circuit according to claim 8, characterized in that The circuit is used to implement at least one of the following working modes under the control of the control module: A first working mode; corresponding to the first working mode, the positive relay and the negative relay are disconnected, the first switch and the second switch are closed, and the third switch is disconnected; A second working mode, corresponding to the second working mode, triggering the first overcurrent protection device, the first switch and the third switch are closed, and the second switch is opened; The third working mode corresponds to the third working mode, the second overcurrent protection device is triggered, the second switch is closed, and the first switch and the third switch are opened.

10. A battery module, characterized in that: The invention comprises an overcurrent protection circuit as claimed in any one of claims 1 to 9.

11. An electrical device, characterized in that: The invention comprises a battery module and an overcurrent protection circuit as claimed in any one of claims 1 to 9.

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