Battery management system, battery device and electric device

Abstract

The utility model discloses a battery management system, a battery device and a power utilization device. The battery management system comprises a first protection circuit and a second protection circuit, the first protection circuit is electrically connected with an input port and the second protection circuit, the second protection circuit is further electrically connected with an output port, the input port is used for being connected with a power supply, and the output port is used for being connected with a target circuit; the first protection circuit comprises a first device, the second protection circuit comprises a second device, the response speed of the first device to the surge is greater than that of the second device to the surge, and the protection capability of the second device to the surge is greater than that of the first device to the surge. According to the embodiment of the invention, the problem that the battery management system is easy to break down due to surge current can be solved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery management system, a battery device and an electrical device. Background Art

[0002] With the rapid development of new energy vehicles such as new energy cars, the emergence of new energy vehicles has played a huge role in promoting social development and environmental protection.

[0003] In order to ensure that the battery can be charged and discharged safely and stably, the battery management system (BMS) plays a vital role. In the battery management system, there is a circuit part connected to the charging device (such as a charging pile). However, under some special working conditions, a transient surge current will be generated on the charging device, which can easily cause the battery management system to malfunction. Utility Model Content

[0004] The present application provides a battery management system, a battery device and an electrical device, which can solve the problem that the battery management system is prone to malfunction due to surge current.

[0005] In a first aspect, the present application provides a battery management system, including a first protection circuit and a second protection circuit, the first protection circuit is electrically connected to an input port and the second protection circuit, the second protection circuit is also electrically connected to an output port, the input port is used to access a power supply, and the output port is used to connect to a target circuit; the first protection circuit includes a first device, the second protection circuit includes a second device, the response speed of the first device to a surge is greater than the response speed of the second device to a surge, and the protection capability of the second device to a surge is greater than the protection capability of the first device to a surge.

[0006] The battery management system provided in the embodiment of the present application includes at least two levels of protection circuits, and the first protection circuit includes a first device, and the second protection circuit includes a second device. The response speed of the first device is faster, and the protection capability of the second device is stronger. On the one hand, the present application performs double surge protection on the battery management system and can have stronger protection capability; on the other hand, the present application is compatible with the response speed and the protection capability, so that the impact of surge current on the battery management system can be reduced at a faster speed and with a stronger protection capability, and the problem that the battery management system is prone to failure due to surge current can be solved; on the other hand, the first device with a faster response speed is set in the first protection circuit, so that surge protection can be performed at a faster speed closer to the source of the surge current, thereby timely reducing the impact of the surge current on the battery management system.

[0007] In a possible implementation of the first aspect, the first device includes a transient voltage suppression diode, and the second device includes a gas discharge tube.

[0008] Transient voltage suppression diode TVS is a high-efficiency protection device in the form of a diode. When the two poles of TVS are subjected to a reverse transient high-energy impact, for example, it can change the high impedance between the two poles into a low impedance at a speed of picoseconds (ps), absorb the surge current, and clamp the voltage between the two poles to a predetermined value, thereby protecting the components in the battery management system from damage by the surge current.

[0009] Gas discharge tubes (GDTs) can absorb surge currents at the kiloampere level, but their response speed is relatively slow. For example, the response speed of GDT is at the microsecond (us) level.

[0010] In a possible implementation of the first aspect, the second protection circuit further includes a varistor, and the varistor is connected in series with the gas discharge tube.

[0011] In the embodiment of the present application, the varistor is connected in series with the gas discharge tube, which can slightly reduce the breakdown voltage value without affecting the varistor protection level. The gas discharge tube can block the leakage current in the varistor when the battery management system is working normally, and slow down the performance degradation of the varistor. The varistor has many advantages such as fast response speed, good nonlinear characteristics, and large current capacity. The second protection circuit further includes a varistor, which can protect the electrical equipment in time, and can effectively eliminate the problem of continuous current during the discharge of the gas discharge tube, the problem of action sensitivity, and the problem that it is difficult to effectively suppress lightning waves with a large wave head rise steepness.

[0012] In a possible implementation of the first aspect, the battery management system further includes an overcurrent protection element, and the first protection circuit is electrically connected to the input port through the overcurrent protection element.

[0013] In the embodiment of the present application, by setting a resettable fuse and connecting the resettable fuse in series at the position closest to the signal source (input port), the resettable fuse can disconnect the circuit when overcurrent occurs, effectively protecting other devices, thereby further improving the overall protection capability of the battery management system.

[0014] In a possible implementation of the first aspect, the battery management system further includes a common mode isolation component, and the input port is electrically connected to the output port through the common mode isolation component. The common mode isolation component can be used to isolate common mode noise on the line.

[0015] In a possible implementation of the first aspect, the battery management system further includes a filter circuit, which is electrically connected to the input port. The filter circuit can be used to weaken or filter out interference signals on the circuit.

[0016] In a possible implementation of the first aspect, the battery management system also includes a third protection circuit, the third protection circuit is electrically connected to the second protection circuit and the output port, the third protection circuit includes a third device, and the response speed of the third device to a surge is greater than the response speed of the second device to a surge.

[0017] The connection position of the first protection circuit is closer to the input port, the third protection circuit is closer to the output port, and the second protection circuit is electrically connected between the first protection circuit and the third protection circuit. By setting three protection circuits, the overall surge protection capability can be further enhanced.

[0018] In a possible implementation of the first aspect, the first protection circuit includes a first transient voltage suppression diode, a second transient voltage suppression diode, and a third transient voltage suppression diode;

[0019] The input port includes a first input terminal and a second input terminal;

[0020] A first end of the first transient voltage suppression diode is electrically connected to the first input end, and a second end of the first transient voltage suppression diode is electrically connected to the second input end;

[0021] The first end of the second transient voltage suppression diode is electrically connected to the first input end, the second end of the second transient voltage suppression diode is electrically connected to the first end of the third transient voltage suppression diode and the reference ground, and the second end of the third transient voltage suppression diode is electrically connected to the second input end.

[0022] The first transient voltage suppression diode can quickly absorb a common-mode surge with relatively small energy (for example, energy within a few hundred watts and current within a few hundred amperes) in the ps level range. After the second transient voltage suppression diode and the third transient voltage suppression diode are connected in series, they can quickly absorb a differential-mode surge with relatively small energy in the ps level range.

[0023] In a possible implementation of the first aspect, the filter circuit includes a first capacitor, a second capacitor, a third capacitor, a first resistor, and a second resistor;

[0024] The input port includes a first input terminal and a second input terminal;

[0025] A first end of the first capacitor is electrically connected to the first input end, a second end of the first capacitor is electrically connected to the first end of the second capacitor, the first end of the third capacitor and the reference ground, and a second end of the second capacitor is electrically connected to the second input end;

[0026] The first end of the first resistor is electrically connected to the first input end, the second end of the first resistor is electrically connected to the first end of the second resistor and the second end of the third capacitor, and the second end of the second resistor is electrically connected to the second input end.

[0027] In this embodiment, the first capacitor, the first resistor, and the third capacitor constitute a first Π-type third-order filter circuit, and the second capacitor, the second resistor, and the third capacitor constitute a second Π-type third-order filter circuit. The two Π-type third-order filter circuits can filter the signals of the branch where the first input terminal is located and the branch where the second input terminal is located. The two Π-type third-order filter circuits can make the voltage before entering the second protection circuit relatively smooth within the us level time range.

[0028] In a possible implementation of the first aspect, the third protection circuit includes a fourth transient voltage suppression diode, a fifth transient voltage suppression diode, and a sixth transient voltage suppression diode;

[0029] The output port includes a first output port and a second output port;

[0030] A first end of a fourth transient voltage suppression diode is electrically connected to the first output port, and a second end of the fourth transient voltage suppression diode is electrically connected to the second output port;

[0031] A first end of the fifth transient voltage suppression diode is electrically connected to the first output port, a second end of the fifth transient voltage suppression diode is electrically connected to the first end of the sixth transient voltage suppression diode and the reference ground, and a second end of the sixth transient voltage suppression diode is electrically connected to the second output port.

[0032] The fourth transient voltage suppression diode can quickly absorb a common mode surge with relatively small energy (for example, energy within a few hundred watts and current within a few hundred amperes) in the ps level range. After the fifth transient voltage suppression diode and the sixth transient voltage suppression diode are connected in series, they can quickly absorb a differential mode surge with relatively small energy in the ps level range.

[0033] Based on the same inventive concept, in a second aspect, an embodiment of the present application provides a battery device, including a battery and a battery management system as in any one of the embodiments of the first aspect.

[0034] Based on the same inventive concept, in a third aspect, an embodiment of the present application provides an electrical device, comprising a battery system as described in any embodiment of the second aspect.

[0035] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0037] Figure 1This is a schematic diagram of the structure of a battery management system according to an embodiment of the present application;

[0038] Figure 2 This is a schematic structural diagram of a battery management system according to another embodiment of the present application;

[0039] Figure 3 This is a schematic structural diagram of a battery management system according to another embodiment of the present application;

[0040] Figure 4 This is a schematic structural diagram of a battery management system according to another embodiment of the present application;

[0041] Figure 5 This is a schematic structural diagram of a battery management system according to another embodiment of the present application;

[0042] Figure 6 This is a schematic structural diagram of a battery management system according to another embodiment of the present application;

[0043] Figure 7 This is a schematic structural diagram of a battery management system according to another embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In the application circuit of BMS, there is a circuit part connected to the charging pile. The applicant has found that under some special working conditions, there will be some kiloampere-level transient surge currents on the charging pile, which can easily damage the device and cause the battery management system to malfunction due to the surge current.

[0048] In order to solve the above-mentioned technical problems, the present application provides a battery management system, a battery device and an electrical device. The battery management system includes at least two levels of protection circuits, and the first protection circuit includes a first device, and the second protection circuit includes a second device. The first device has a faster response speed and the second device has a stronger protection capability. It can be compatible with the response speed and the protection capability, and provide double protection for the battery management system, thereby reducing the impact of surge current on the battery management system and solving the problem that the battery management system is prone to failure due to surge current.

[0049] The following first introduces the battery management system provided in the embodiment of the present application.

[0050] like Figure 1 As shown, the battery management system includes a first protection circuit 10 and a second protection circuit 20. The first protection circuit 10 is electrically connected to an input port 200 and the second protection circuit 20. The second protection circuit 20 is also electrically connected to an output port 300. The input port 200 is used to access a power source (not shown in the figure), and the output port 300 is used to connect to a target circuit (not shown in the figure).

[0051] The first protection circuit 10 includes a first device 11, and the second protection circuit 20 includes a second device 21. The response speed of the first device 11 to surge is greater than that of the second device 21, and the protection capability of the second device 21 to surge is greater than that of the first device 11.

[0052] Exemplarily, the input port 200 is used to connect an external device. For example, the input port 200 includes but is not limited to a test interface, a connector interface, etc. The external device includes but is not limited to a charging pile. The target circuit includes a chip or other circuit in the BMS. The input port 200 is used to provide an electrical signal to the target circuit. It is understandable that the electrical signal provided by the input port 200 to the target circuit is first processed for surge protection by the first protection circuit 10, and then processed for surge protection by the second protection circuit 20, and the processed signal is transmitted to the output port 300. It is understandable that the first protection circuit 10 and the second protection circuit 20 are used together to prevent the output port 300 and the devices connected thereto from being damaged by surge current shocks.

[0053] Exemplarily, both the first protection circuit 10 and the second protection circuit 20 can absorb surge current, thereby playing a role in surge protection. The connection position of the first protection circuit 10 is closer to the input port 200. The first protection circuit 10 serves as primary protection, and the second protection circuit 20 serves as secondary protection.

[0054] It is understandable that both the first device 11 and the second device 21 can play a role in surge protection, and the two belong to different device types. The response speed of the first device 11 is faster than that of the second device 21. When there is a surge current at the input port 200, the first device 11 can perform surge protection more promptly. The protection capability of the second device 21 is stronger than that of the first device 11. When there is a surge current at the input port 200, and when the surge current exceeds the protection capability of the first device 11, the second device 21 can further protect the surge current. Combining the first device and the second device can enhance the overall surge protection capability and enhance the rapid response capability.

[0055] The battery management system provided in the embodiment of the present application includes at least two levels of protection circuits, and the first protection circuit includes a first device, and the second protection circuit includes a second device. The response speed of the first device is faster, and the protection capability of the second device is stronger. On the one hand, the present application performs double surge protection on the battery management system and can have stronger protection capability; on the other hand, the present application is compatible with the response speed and the protection capability, so that the impact of surge current on the battery management system can be reduced at a faster speed and with a stronger protection capability, and the problem that the battery management system is prone to failure due to surge current can be solved; on the other hand, the first device with a faster response speed is set in the first protection circuit, so that surge protection can be performed at a faster speed closer to the source of the surge current, thereby timely reducing the impact of the surge current on the battery management system.

[0056] In some embodiments, the first device includes but is not limited to transient voltage suppressors (TVS), and the second device includes but is not limited to gas discharge tubes (GDT).

[0057] TVS is a high-efficiency protection device in the form of a diode. When the two poles of TVS are subjected to a reverse transient high-energy impact, for example, the high impedance between the two poles can be changed to a low impedance at a speed of picoseconds (ps), absorbing the surge current and clamping the voltage between the two poles to a predetermined value, thereby protecting the components in the battery management system from damage by the surge current.

[0058] GDT can absorb surge currents at the kiloampere level, but its response speed is relatively slow. For example, the response speed of GDT is at the microsecond (us) level.

[0059] For example, Figure 2 As shown, the input port 200 may include a first input terminal P1 and a second input terminal P2. For example, the first input terminal P1 is used to access a positive polarity voltage, and the second input terminal P2 is used to connect to a ground terminal. The target circuit connected to the output port is the first chip IC1, and the input pin a1 of the first chip IC1 is electrically connected to the first input terminal P1, and the input pin a4 of the first chip IC1 is electrically connected to the second input terminal P2.

[0060] The first device 11 includes three transient voltage suppression diodes, namely D1 , D2 , and D3 , and the second device 21 includes a gas discharge tube GDT.

[0061] The transient voltage suppression diode D1 is connected in parallel with the gas discharge tube GDT, and the transient voltage suppression diode D2 and the transient voltage suppression diode D3 are connected in series and then connected in parallel with the gas discharge tube GDT.

[0062] In some embodiments, Figure 3 As shown, the second protection circuit 20 further includes a varistor RV, and the varistor RV is connected in series with the gas discharge tube GDT.

[0063] In the embodiment of the present application, the varistor RV is connected in series with the gas discharge tube GDT, which can slightly reduce the breakdown voltage value without affecting the varistor protection level. The gas discharge tube can block the leakage current in the varistor when the battery management system is working normally, and slow down the performance degradation of the varistor. The varistor has many advantages such as fast response speed, good nonlinear characteristics, and large current capacity. The second protection circuit further includes a varistor, which can protect the electrical equipment in time, and can effectively prevent the problem of continuous current during the discharge of the gas discharge tube, the problem of action sensitivity, and the problem of difficulty in effectively suppressing lightning waves with a large wave head rise steepness.

[0064] In addition, the second protection circuit further includes a varistor, which can also reduce the limit voltage value. For example, a varistor with a lower conduction voltage can be used to reduce the limit voltage value.

[0065] In some embodiments, Figure 4 As shown, the battery management system further includes an overcurrent protection element, and the first protection circuit 10 is electrically connected to the input port 200 through the overcurrent protection element. Exemplarily, the overcurrent protection element is used to: under normal circumstances (for example, no surge current is generated), not limit the flow of current, and when an overcurrent condition occurs (for example, a surge current is generated), disconnect the electrical connection between the first protection circuit 10 and the input port 200.

[0066] The overcurrent protection element includes but is not limited to a resettable fuse (Polymeric Positive Temperature Coefficient, PPTC). The first protection circuit 10 is electrically connected to the input port 200 via the resettable fuse PPTC.

[0067] Specifically, when the input port 200 includes a first input terminal P1 and a second input terminal P2, two ends of the first protection circuit 10 are electrically connected to the first input terminal P1 and the second input terminal P2 respectively through a self-recovery fuse PPTC.

[0068] For example, electrodes or wires may be attached to both sides of the PPTC material and connected in series between the input port and the first protection circuit 10 .

[0069] The resettable fuse PPTC is made of high molecular polymer positive temperature coefficient material. Under normal circumstances (for example, no surge current is generated), the resistance value of the resettable fuse PPTC is in an extremely low state (microohm), and the current can pass through the resettable fuse PPTC without restriction. When an overcurrent condition occurs (for example, a surge current is generated), the resettable fuse PPTC will heat up, and its own resistance value will rise rapidly. When the resistance value of the resettable fuse PPTC rises rapidly to almost make the resettable fuse PPTC reach an insulating state, the resettable fuse PPTC will cut off the current in the circuit to protect other mechanisms and components in the circuit. Until the overcurrent condition is removed, the resettable fuse PPTC cools down, and its resistance value drops to a value close to its initial value. At this time, the resettable fuse PPTC is restored to a state where current can pass again.

[0070] In the embodiment of the present application, a resettable fuse PPTC is provided and connected in series at a position closest to the signal source (input port). The resettable fuse PPTC can disconnect the circuit when overcurrent occurs, effectively protecting other devices, thereby further improving the overall protection capability of the battery management system.

[0071] In some embodiments, Figures 2 to 4 As shown in any of the figures in the drawings, the battery management system further includes a common mode isolation component 30 , and the input port 200 is electrically connected to the output port through the common mode isolation component 30 . Figures 2 to 4 In the figure, the target circuit connected to the output port is the first chip IC1 for illustration, and the two input ends of the input port 200 are electrically connected to the input pins a1 and a4 of the first chip IC1 respectively through the common mode isolation component 30 .

[0072] The common mode isolation component 30 can be used to isolate the common mode noise on the line. Exemplarily, the common mode isolation component 30 includes but is not limited to the common mode inductor L1. The common mode inductor L1 can attenuate and filter out the common mode current and can bidirectionally suppress the common mode electromagnetic interference (EMI) interference.

[0073] As an example, Figure 2 or Figure 3 As shown, the common mode isolation component 30 is electrically connected between the first protection circuit 10 and the second protection circuit 20. That is, the first protection circuit 10 is electrically connected between the common mode isolation component 30 and the input port 200, and the second protection circuit 20 is electrically connected between the common mode isolation component 30 and the protected target circuit.

[0074] As another example, Figure 4 As shown, the common mode isolation component 30 is electrically connected between the second protection circuit 20 and the protected target circuit (eg, the first chip IC1). That is, the input port is electrically connected to the target circuit through the first protection circuit 10, the second protection circuit 20, and the common mode isolation component 30 in sequence.

[0075] In some embodiments, Figures 5 to 7 As shown in any of the figures in the drawings, the battery management system further includes a filter circuit 40 , and the filter circuit 40 is electrically connected to the input port 200 .

[0076] Filter circuits can be used to reduce or filter out interference signals on a circuit.

[0077] As an example, the filter circuit 40 is electrically connected between the first protection circuit 10 and the second protection circuit 20. In this case, the first protection circuit 10 and the filter circuit 40 together can be regarded as a first-level protection circuit, and the second protection circuit 20 is a second-level protection circuit.

[0078] In some embodiments, Figures 5 to 7 As shown in any of the figures, the filtering circuit 40 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1 and a second resistor R2; the input port 200 includes a first input terminal P1 and a second input terminal P2; the first end of the first capacitor C1 is electrically connected to the first input terminal P1, the second end of the first capacitor C1 is electrically connected to the first end of the second capacitor C2, the first end of the third capacitor C3 and the reference ground GND1, and the second end of the second capacitor C2 is electrically connected to the second input terminal P2; the first end of the first resistor R1 is electrically connected to the first input terminal P1, the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2, the second end of the third capacitor C3, and the second end of the second resistor R2 is electrically connected to the second input terminal P2.

[0079] In this embodiment, the first capacitor C1, the first resistor R1, and the third capacitor C3 form a first Π-type third-order filter circuit, and the second capacitor C2, the second resistor R2, and the third capacitor C3 form a second Π-type third-order filter circuit. The two Π-type third-order filter circuits can filter the signals of the branch where the first input terminal P1 is located and the branch where the second input terminal P2 is located. The two Π-type third-order filter circuits can make the voltage before entering the second protection circuit relatively smooth within the us level time range.

[0080] It should be noted that the filtering circuit of the present application includes but is not limited to a Π-type third-order filtering circuit. In other embodiments, the filtering circuit may adopt other circuit structures as long as the filtering function can be achieved.

[0081] In some embodiments, Figure 4 or Figure 7 As shown, the battery management system also includes a third protection circuit 50, which is electrically connected to the second protection circuit 20 and the output port. The third protection circuit 50 includes a third device, and the response speed of the third device to surge is greater than the response speed of the second device 21 to surge.

[0082] The connection position of the first protection circuit 10 is closer to the input port 200, the third protection circuit 50 is closer to the output port, and the second protection circuit 20 is electrically connected between the first protection circuit 10 and the third protection circuit 50. By providing three protection circuits, the overall surge protection capability can be further enhanced.

[0083] It is understandable that the third device can play a role in surge protection, and the third device and the second device belong to different device types. The response speed of the third device is faster than that of the second device. When there is a surge current at the output port, the third device can perform surge protection more timely.

[0084] Exemplarily, the third device and the first device belong to the same device type.

[0085] Exemplarily, the first device includes but is not limited to a transient voltage suppressor diode TVS, the second device includes but is not limited to a gas discharge tube GDT, and the third device includes but is not limited to a transient voltage suppressor diode TVS.

[0086] In some embodiments, Figures 2 to 7 As shown in any of the figures, the first protection circuit 10 includes a first transient voltage suppression diode D1, a second transient voltage suppression diode D2 and a third transient voltage suppression diode D3.

[0087] The input port 200 includes a first input terminal P1 and a second input terminal P2.

[0088] A first end of the first transient voltage suppression diode D1 is electrically connected to the first input terminal P1, and a second end of the first transient voltage suppression diode D1 is electrically connected to the second input terminal P2; a first end of the second transient voltage suppression diode D2 is electrically connected to the first input terminal P1, a second end of the second transient voltage suppression diode D2 is electrically connected to a first end of a third transient voltage suppression diode D3 and a reference ground GND1, and a second end of the third transient voltage suppression diode D3 is electrically connected to the second input terminal P2.

[0089] The second transient voltage suppression diode D2 and the third transient voltage suppression diode D3 are connected in series and then connected in parallel with the first transient voltage suppression diode D1.

[0090] The first transient voltage suppression diode D1 can quickly absorb common-mode surges with relatively small energy (for example, energy within a few hundred watts and current within a few hundred amperes) in the ps level range. The second transient voltage suppression diode D2 and the third transient voltage suppression diode D3 are connected in series to quickly absorb differential-mode surges with relatively small energy in the ps level range.

[0091] In some embodiments, Figure 4 or Figure 7 As shown, the structure of the third protection circuit may be the same as that of the first protection circuit. Specifically, the third protection circuit 50 includes a fourth transient voltage suppression diode D4, a fifth transient voltage suppression diode D5, and a sixth transient voltage suppression diode D6.

[0092] The output ports include a first output port and a second output port. Figure 4 , Figure 7 In the figure, the first output port is connected to the input pin a1 of the first chip IC1, and the second output port is connected to the input pin a4 of the first chip IC1.

[0093] A first end of the fourth transient voltage suppression diode D4 is electrically connected to the first output port, and a second end of the fourth transient voltage suppression diode D4 is electrically connected to the second output port; a first end of the fifth transient voltage suppression diode D5 is electrically connected to the first output port, a second end of the fifth transient voltage suppression diode D5 is electrically connected to the first end of the sixth transient voltage suppression diode and the reference ground GND1, and a second end of the sixth transient voltage suppression diode D6 is electrically connected to the second output port.

[0094] The fifth transient voltage suppression diode D5 and the sixth transient voltage suppression diode D6 are connected in series and then connected in parallel with the fourth transient voltage suppression diode D4.

[0095] The fourth transient voltage suppression diode D4 can quickly absorb a common mode surge with relatively small energy (for example, energy within a few hundred watts and current within a few hundred amperes) in the ps level range. After the fifth transient voltage suppression diode D5 and the sixth transient voltage suppression diode D6 are connected in series, they can quickly absorb a differential mode surge with relatively small energy in the ps level range.

[0096] Based on the same inventive concept, the embodiment of the present application also provides a battery device, including a battery and a battery management system in any of the above embodiments. It can be understood that the battery device has the beneficial effects of the battery management system provided in the embodiment of the present application, and the specific description of the battery management system in the above embodiments can be referred to, and this embodiment will not be repeated here.

[0097] Based on the same inventive concept, the present application also provides an electric device. The electric device includes a battery device, and the battery device includes a battery management system in any of the above embodiments. It can be understood that the electric device has the beneficial effects of the battery management system provided in the embodiments of the present application. For details, please refer to the specific description of the battery management system in the above embodiments, which will not be repeated in this embodiment.

[0098] It should be noted that, in the above embodiments, the resistor is represented by a single resistor. In other embodiments, the resistor may also be an integration of series, parallel or hybrid resistors. In addition, in the above embodiments, the capacitor is represented by a single capacitor. In other embodiments, the capacitor may also be an integration of series, parallel or hybrid capacitors. The specific parameters of each device may be set according to actual needs, and this application does not limit this.

[0099] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0100] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery management system, characterized in that: It includes a first protection circuit and a second protection circuit, the first protection circuit is electrically connected to an input port and the second protection circuit, the second protection circuit is also electrically connected to an output port, the input port is used to access a power supply, and the output port is used to connect to a target circuit; The first protection circuit includes a first device, and the second protection circuit includes a second device. The response speed of the first device to surges is greater than the response speed of the second device to surges, and the protection capability of the second device to surges is greater than the protection capability of the first device to surges.

2. The battery management system according to claim 1, characterized in that: The first component comprises a transient voltage suppressor diode, and the second component comprises a gas discharge tube.

3. The battery management system according to claim 2, characterized in that: The second protection circuit further includes a varistor, and the varistor is connected in series with the gas discharge tube.

4. The battery management system according to any one of claims 1 to 3, characterized in that: The battery management system further includes an overcurrent protection element, and the first protection circuit is electrically connected to the input port via the overcurrent protection element.

5. The battery management system according to any one of claims 1 to 3, characterized in that: The battery management system further includes a common mode isolation component, and the input port is electrically connected to the output port through the common mode isolation component.

6. The battery management system according to any one of claims 1 to 3, characterized in that: The battery management system further includes a filter circuit, and the filter circuit is electrically connected to the input port.

7. The battery management system according to any one of claims 1 to 3, characterized in that: The battery management system also includes a third protection circuit, which is electrically connected to the second protection circuit and the output port. The third protection circuit includes a third device, and the response speed of the third device to surge is greater than the response speed of the second device to surge.

8. The battery management system according to any one of claims 1 to 3, characterized in that: The first protection circuit includes a first transient voltage suppression diode, a second transient voltage suppression diode and a third transient voltage suppression diode; The input port includes a first input terminal and a second input terminal; The first end of the first transient voltage suppression diode is electrically connected to the first input end, and the second end of the first transient voltage suppression diode is electrically connected to the second input end; The first end of the second transient voltage suppression diode is electrically connected to the first input end, the second end of the second transient voltage suppression diode is electrically connected to the first end of the third transient voltage suppression diode and a reference ground, and the second end of the third transient voltage suppression diode is electrically connected to the second input end.

9. The battery management system according to claim 6, characterized in that: The filter circuit includes a first capacitor, a second capacitor, a third capacitor, a first resistor and a second resistor; The input port includes a first input terminal and a second input terminal; The first end of the first capacitor is electrically connected to the first input end, the second end of the first capacitor is electrically connected to the first end of the second capacitor, the first end of the third capacitor and the reference ground, and the second end of the second capacitor is electrically connected to the second input end; The first end of the first resistor is electrically connected to the first input end, the second end of the first resistor is electrically connected to the first end of the second resistor and the second end of the third capacitor, and the second end of the second resistor is electrically connected to the second input end.

10. The battery management system according to claim 7, characterized in that: The third protection circuit includes a fourth transient voltage suppression diode, a fifth transient voltage suppression diode and a sixth transient voltage suppression diode; The output port comprises a first output port and a second output port; A first end of the fourth transient voltage suppression diode is electrically connected to the first output port, and a second end of the fourth transient voltage suppression diode is electrically connected to the second output port; The first end of the fifth transient voltage suppression diode is electrically connected to the first output port, the second end of the fifth transient voltage suppression diode is electrically connected to the first end of the sixth transient voltage suppression diode and the reference ground, and the second end of the sixth transient voltage suppression diode is electrically connected to the second output port.

11. A battery device, characterized in that: The invention comprises a battery and a battery management system as claimed in any one of claims 1 to 10.

12. An electrical device, characterized in that: Comprising the battery device as claimed in claim 11.

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