Sealing ring, sealing ring assembly, battery assembly and electric equipment
By designing sealing rings and conductor structures in the battery assembly, the problem of water inlet and leakage of battery assembly is solved, and a higher success rate of water inlet alarm and detection accuracy is achieved, ensuring the waterproof performance and safety of the battery assembly.
Patent Information
- Application Number
- CN202420670305.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-01
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-04-01
AI Technical Summary
The problem of water leakage in the battery module will not be discovered and repaired in time, affecting the safety and performance of the battery module.
A sealing ring is designed, including a first seal and a first conductor for being disposed between the housing and the cover plate of the battery assembly, the first seal and the first conductor are arranged in a central direction along the edge of the opening toward the center, and are electrically connected, And improve the detection range and accuracy through insulating parts and connecting wires to achieve water inlet alarm.
It improves the success rate and accuracy of battery module water inlet alarms and reduces the probability of missed reports, and ensures the waterproof performance and safety of battery modules.
Smart Images
Figure CN222146420U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vehicles, and in particular to a sealing ring, a sealing ring assembly, a battery assembly and electrical equipment. Background Art
[0002] In order to prevent water from entering the battery assembly, the battery assembly is sealed. However, when the seal fails, water can easily enter the battery assembly. If it cannot be discovered and repaired in time, the safety and performance of the battery assembly will be affected. Utility Model Content
[0003] The utility model aims to provide a sealing ring, a sealing ring assembly, a battery assembly and an electric device, so as to solve the problem of water ingress and leakage of the battery assembly.
[0004] In order to achieve the purpose of the utility model, the utility model provides the following technical solutions:
[0005] In a first aspect, the utility model provides a sealing ring, which is used for a battery assembly, wherein the battery assembly includes a shell and a cover plate arranged opposite to each other, and the shell has an opening; the sealing ring is used to be arranged between the shell and the cover plate, and the sealing ring is used to surround the opening, and the sealing ring includes a first sealing member and a first conductor, and the first conductor is suitable for being electrically connected to a detection member.
[0006] In one embodiment, the sealing ring further includes a second sealing member and a second conductor arranged opposite to each other, the first sealing member, the first conductor, the second sealing member and the second conductor are arranged in sequence along a first direction, the first direction is the direction from the edge of the opening toward the center of the opening, the first sealing member, the first conductor, the second sealing member and the second conductor all surround the opening, and the first conductor is electrically connected to the second conductor.
[0007] In one embodiment, the first sealing member has a first surface in a second direction, the second direction is the direction of the sealing ring toward the cover plate, the second sealing member has a second surface in the second direction, the first surface protrudes from a surface of the first conductor in the second direction and a surface of the second conductor in the second direction, the second surface protrudes from a surface of the first conductor in the second direction and a surface of the second conductor in the second direction, and the second direction intersects with the first direction.
[0008] In one embodiment, the sealing ring further includes an insulating member, which is disposed around a side of the second sealing member facing away from the first sealing member, and is used to surround the opening.
[0009] In one embodiment, the second conductor is disposed through the insulating member.
[0010] In one embodiment, the sealing ring further includes a connecting wire, the connecting wire is electrically connected to the second conductor, and the connecting wire is passed through the insulating member.
[0011] In a second aspect, the utility model further provides a sealing ring assembly, comprising a detection member and a sealing ring as described in any one of the various embodiments of the first aspect, wherein the first conductor is electrically connected to the detection member.
[0012] In one embodiment, the sealing ring assembly further includes a connecting wire, one end of which is electrically connected to the sealing ring, and the other end of which is electrically connected to the detection element.
[0013] In one embodiment, the sealing ring assembly further includes an electrical connector and a second conductor connected to each other, the first conductor is electrically connected to the second conductor via the electrical connector, and the second conductor is electrically connected to the connecting wire.
[0014] In the third aspect, the utility model also provides a battery assembly, comprising: a shell having an opening; a cover plate, the cover plate being arranged opposite to the shell and used to close the opening; a sealing ring assembly as described in any of the various embodiments of the second aspect, the sealing ring assembly being arranged between the shell and the cover plate, and the sealing ring being used to close the gap between the shell and the cover plate.
[0015] In one embodiment, the battery assembly further includes a power supply, a switch, a second conductor, a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein the first end of the switch is coupled to the negative electrode of the power supply, the second end of the switch is coupled to the first end of the second conductor, the second end of the second conductor is respectively coupled to the first end of the second resistor and the first end of the fourth resistor, the second end of the fourth resistor is coupled to the first end of the third resistor through the first conductor, the first end of the first resistor is coupled to the positive electrode of the power supply, and the second end of the first resistor is respectively coupled to the second end of the second resistor and the second end of the third resistor. In one embodiment, one end of the first seal is connected to the tray and the other end is connected to the cover plate, and one end of the second seal is connected to the tray and the other end is connected to the cover plate.
[0016] In a fourth aspect, the utility model further provides an electrical device, comprising a battery assembly as described in any one of the various embodiments of the third aspect, wherein the battery assembly is used to supply power to the electrical device.
[0017] By setting a sealing ring, the sealing ring is used for a battery assembly, the battery assembly includes a shell and a cover plate arranged relatively to each other, the shell has an opening, the sealing ring is used to be arranged between the shell and the cover plate, the sealing ring is used to surround the opening, the sealing ring includes a first sealing part and a first conductor, the first conductor is suitable for being electrically connected to the detection part, the above-mentioned arrangement can cover the positions where water may enter the battery pack to the greatest extent, thereby improving the success rate of the water ingress alarm of the battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 is an assembly diagram of a sealing ring of an embodiment;
[0020] Figure 2 is a partial assembly diagram of a battery assembly of an embodiment;
[0021] Figure 3 is a partial cross-sectional view of a sealing ring of an embodiment;
[0022] Figure 4 is a simplified circuit diagram of a seal ring assembly according to one embodiment.
[0023] Description of reference numerals:
[0024] 10-sealing ring, 11-first sealing member, 111-first surface, 12-first conductor, 13-second sealing member, 131-second surface, 14-second conductor, 15-insulating member, 20-cover plate, 21-tray, 22-connecting member, 23-accommodating cavity, 24-electrical connecting member, 25-analog-digital converter, 30-connector, R1-first resistor, R2-second resistor, R3-third resistor, R4-fourth resistor, K-switch, X-first direction, Y-second direction. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.
[0027] Unless otherwise defined, all technical and scientific terms used in this utility model have the same meaning as those commonly understood by technicians in the technical field of this utility model. The terms used in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this utility model includes any and all combinations of one or more related listed items.
[0028] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
[0029] The utility model embodiment provides a sealing ring 10, the sealing ring 10 is used for a battery assembly, please refer to Figure 1 and Figure 2 , including a housing, a cover plate 20, a first sealing member 11 and a first conductor 12. Optionally, the first sealing member 11 and the first conductor 12 are vulcanized together by metal encapsulation, thereby forming a sealing structure, thereby improving the stability of the connection between the first sealing member 11 and the first conductor 12. Optionally, the sealing ring 10 encloses a receiving cavity 23.
[0030] The battery assembly includes a shell and a cover plate 20 arranged opposite to each other, and the shell has an opening; the sealing ring 10 is used to be arranged between the shell and the cover plate 20, and the sealing ring 10 is used to surround the opening. The sealing ring 10 includes a first sealing member 11 and a first conductor 12, and the first conductor 12 is suitable for being electrically connected to the detection member.
[0031] By setting a sealing ring 10, the sealing ring 10 is used for a battery assembly, the battery assembly includes a shell and a cover plate 20 that are relatively arranged, the shell has an opening, the sealing ring 10 is used to be arranged between the shell and the cover plate 20, the sealing ring 10 is used to surround the opening, the sealing ring 10 includes a first sealing member 11 and a first conductor 12, the first conductor 12 is suitable for being electrically connected to the detection member, the above-mentioned arrangement can cover the positions where the battery pack may be flooded to the greatest extent, thereby improving the success rate of the water ingress alarm of the battery assembly.
[0032] In one embodiment, please refer to Figure 1 and Figure 2The sealing ring 10 also includes a second sealing member 13 and a second conductor 14 which are arranged opposite to each other. The first sealing member 11, the first conductor 12, the second sealing member 13 and the second conductor 14 are arranged in sequence along a first direction X. The first direction X is a direction from the edge of the opening toward the center of the opening. The first sealing member 11, the first conductor 12, the second sealing member 13 and the second conductor 14 all surround the opening, and the first conductor 12 is electrically connected to the second conductor 14.
[0033] Optional, please refer to Figure 1 and Figure 2 The first seal 11, the first conductor 12, the second seal 13 and the second conductor 14 are all ring-shaped, which can cover any part of the seal ring 10 as much as possible, thereby improving the detection range. When water enters any part of the seal ring 10, an alarm will be triggered, reducing the probability of missed alarms.
[0034] Optionally, it should be noted that the present invention does not limit the shapes of the first seal 11, the first conductor 12, the second seal 13, and the second conductor 14. The shapes of the first seal 11, the first conductor 12, the second seal 13, and the second conductor 14 can be polygonal, circular, elliptical, and irregular shapes. Optionally, the shapes of the first seal 11, the first conductor 12, the second seal 13, and the second conductor 14 can be, but are not limited to, quadrilateral, hexagonal, circular, octagonal, elliptical, and irregular shapes. Optional, please refer to Figure 1 and Figure 2 , the first seal 11 and the second seal 13 are both elastically deformable structures. Optionally, the first seal 11 is a rubber seal ring 10, which can play a role of waterproof insulation. Optionally, the second seal 13 is a rubber seal ring 10, which can play a role of waterproof insulation. Optionally, the first seal 11 and the second seal 13 can both produce elastic deformation when squeezed.
[0035] Specifically, the above arrangement improves the flexibility of the arrangement of the first seal 11 , the first conductor 12 , the second seal 13 , and the second conductor 14 , improves the detection structure, and increases the detection range of the sealing ring 10 .
[0036] In one embodiment, please refer to Figure 1 and Figure 2 The first sealing member 11 has a first surface 111 in the second direction Y, the second direction Y is the direction of the sealing ring 10 toward the cover plate 20, the second sealing member 13 has a second surface 131 in the second direction Y, the first surface 111 protrudes from the surface of the first conductor 12 in the second direction Y and the surface of the second conductor 14 in the second direction Y, the second surface 131 protrudes from the surface of the first conductor 12 in the second direction Y and the surface of the second conductor 14 in the second direction Y, and the second direction Y intersects with the first direction X.
[0037] Optionally, the first surface 111 and the second surface 131 are polished. The polishing method can be fluid polishing, mechanical polishing, ultrasonic polishing, chemical polishing, electrolytic polishing, etc. The first surface 111 and the second surface 131 are polished to improve the smoothness of the first surface 111 and the second surface 131, and avoid scratching other parts. Optionally, the first surface 111 is chemically polished. The specific process is to use an oxidant solution to oxidize the surface of the first surface 111 under certain conditions. This oxide layer can gradually dissolve into the solution. The micro-protrusions of the first surface 111 are oxidized faster and more, while the micro-concave parts are oxidized slowly and less. Similarly, the oxide layer at the protrusions diffuses more and faster than everywhere and dissolves in the solution. Therefore, the surface of the first surface 111 is gradually leveled to avoid scratching other parts. Use chemical polishing to process other surfaces to avoid affecting the rigidity of the material, so that other surfaces are smoothed and glossy. This type of polishing is simple to operate and has high processing efficiency.
[0038] Specifically, the above-mentioned arrangement of the first surface 111 and the second surface 131 enables the first seal 11 and the second seal 13 to prevent foreign matter from contacting the first conductor 12 and the second conductor 14. At the same time, the first conductor 12 and the second conductor 14 do not contact the tray 21 and the cover plate 20 in the second direction Y, thereby improving the waterproof insulation function of the sealing ring 10 assembly and further improving the accuracy of the sealing ring 10 assembly in detecting water ingress.
[0039] In one embodiment, please refer to Figure 1 and Figure 2 The sealing ring 10 further includes an insulating member 15 , which is disposed around a side of the second sealing member 13 facing away from the first sealing member 11 , and is used to surround the opening.
[0040] Optionally, a dimension of the insulating member 15 along the second direction Y is smaller than a dimension of the second sealing member 13 along the second direction Y.
[0041] Specifically, the insulating member 15 fixes the second conductor 14 and reduces the probability of water entering the battery pack, thereby improving the waterproof insulation function of the sealing ring 10 assembly and further improving the accuracy of the sealing ring 10 assembly in detecting water ingress.
[0042] In one embodiment, please refer to Figure 1 and Figure 2 The second conductor 14 is disposed through the insulating member 15 .
[0043] Optionally, the insulating member 15 is provided with a receiving hole, and the second conductor 14 is passed through the receiving hole.
[0044] Specifically, the above arrangement improves the space utilization of the sealing ring 10 assembly.
[0045] Optional, please refer to Figure 1 and Figure 2 The orthographic projection of the insulating member 15 in the second direction Y is annular, and the second direction Y intersects with the first direction X.
[0046] Optionally, the above-mentioned features of the insulating member 15 can cover any part of the sealing ring 10 as much as possible, thereby improving the waterproof insulation function of the sealing ring 10 assembly and further improving the accuracy of the sealing ring 10 assembly in detecting water ingress.
[0047] In one embodiment, please refer to Figure 1 and Figure 2 The sealing ring 10 further includes a connecting wire, which is electrically connected to the second conductor 14 and passes through the insulating member 15 .
[0048] Optionally, the length and diameter of the connecting wire are determined according to user needs, a through hole is opened inside the insulating member 15, the connecting wire is passed through the through hole, and sealant is applied to the portion of the connecting wire in contact with the outer wall of the through hole to ensure a certain sealing function.
[0049] Specifically, the above arrangement improves the space utilization of the sealing ring 10 assembly.
[0050] The embodiment of the utility model further provides a sealing ring 10 assembly, comprising a detection member and the aforementioned sealing ring 10, wherein the first conductor 12 is electrically connected to the detection member.
[0051] In one embodiment, please refer to Figure 1 and Figure 2 The sealing ring 10 assembly also includes a connecting wire, one end of which is electrically connected to the sealing ring 10, and the other end of which is electrically connected to the detection element.
[0052] Specifically, the above-mentioned arrangement of the connecting wire improves the structure of the sealing ring 10 component for detecting water ingress, and improves the space utilization rate of the sealing ring 10 component.
[0053] In one embodiment, please refer to Figure 1 and Figure 2 The sealing ring 10 assembly also includes an electrical connector 24 and a second conductor 14 connected to each other. The first conductor 12 is electrically connected to the second conductor 14 through the electrical connector 24, and the second conductor 14 is electrically connected to the connecting wire.
[0054] Optionally, the first conductor 12 and the electrical connector 24 are connected by welding. The present invention uses the brazing connection as an example, which should not be construed as a limitation of the present invention. Optionally, the second conductor 14 and the connecting wire are connected by welding.
[0055] Optionally, the electrical connector 24 is a resistor. Optionally, the number of the electrical connectors 24 is multiple. Optionally, the detection component is a battery management controller. Specifically, the local position between the first conductor 12 and the second conductor 14 is welded by the electrical connector 24 to achieve series conduction, the second conductor 14 is connected to the connector 22 through a wire, the connector 22 is connected to the detection component, and the detection component determines whether water has entered the first seal 11 or the second seal 13 by detecting the voltage change between the tray 21 / cover plate 20 and the first conductor 12 and the second conductor 14. The utility model does not need to arrange multiple water wading sensors, has low cost of use, and is conducive to large-scale production in factories.
[0056] Optionally, the sealing ring 10 assembly also includes a plurality of fastening bolts, the connecting piece 22 includes a male end of a connector 30 and a female end of a connector 30, the sealing ring 10 of the utility model is installed between the tray 21 and the cover plate 20, the fastening bolts fix the cover plate 20 on the tray 21, and at the same time press the sealing ring 10 to achieve sealing, the second conductor 14 is connected to the connecting wire, the connecting wire is led out of the sealing ring 10 and connected to the male end of the connector 30, the male end of the connector 30 is plugged into the female end of the connector 30, and the pins of the female end of the connector 30 are welded and installed on the detection piece.
[0057] An embodiment of the utility model also provides a battery assembly, including a shell, a cover plate 20 and the aforementioned sealing ring 10 assembly, the shell has an opening, the cover plate 20 is arranged opposite to the shell and is used to close the opening, the sealing ring 10 assembly is arranged between the shell and the cover plate 20, and the sealing ring 10 is used to close the gap between the shell and the cover plate 20.
[0058] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 4 The battery assembly also includes a power supply, a switch K, a second conductor 14, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4. The first end of the switch K is coupled to the negative electrode of the power supply, the second end of the switch K is coupled to the first end of the second conductor 14, the second end of the second conductor 14 is respectively coupled to the first end of the second resistor R2 and the first end of the fourth resistor R4, the second end of the fourth resistor R4 is coupled to the first end of the third resistor R3 through the first conductor 12, the first end of the first resistor R1 is coupled to the positive electrode of the power supply, and the second end of the first resistor R1 is respectively coupled to the second end of the second resistor R2 and the second end of the third resistor R3.
[0059] Optional, please refer to Figure 3The electrical connector 24 includes a first resistor R1 and a second resistor R2. The first resistor R1 can be 200KΩ (not limited to 200KΩ), and the second resistor R2 can be 200KΩ (not limited to 200KΩ). The first resistor R1 is on the detection component, and the second resistor R2 is between the first conductor 12 and the second conductor 14. They are connected to each other by welding. When the sealing ring 10 assembly is not flooded, the resistance values of the third resistor R3 and the fourth resistor R4 are theoretically infinite. The analog-to-digital converter 25 can collect the voltage of the second conductor 14, and the battery management controller controls the opening and closing of the switch K to perform an inspection of the entire circuit.
[0060] When the first seal 11 fails, but the second seal 13 is still effective, external water droplets connect the first conductor 12 to the ground, and the third resistor R3 is close to 0Ω. At this time, the voltage between the second conductor 14 and the ground is close to 1.15V, reminding the user that the first seal 11 has failed and needs to be repaired as soon as possible.
[0061] When both the first seal 11 and the second seal 13 fail, external water droplets further conduct the second conductor 14 to the ground, and the third resistor R3 and the fourth resistor R4 are both close to 0Ω. At this time, the voltage between the second conductor 14 and the ground is close to 0V, and the user is reminded that both the first seal 11 and the second seal 13 have failed, water has entered the battery pack, and immediate maintenance is required.
[0062] Specifically, the first sealing member 11 and the tray 21 are interference fit, and the second sealing member 13 and the tray 21 are interference fit, so as to ensure the insulation and waterproof performance of the sealing ring 10 assembly.
[0063] Specifically, the above-mentioned arrangement of the first seal 11 and the second seal 13 prevents the entry of foreign matter, thereby preventing the foreign matter from affecting the electrical connection between the first conductor 12 and the second conductor 14. In addition, the above-mentioned arrangement of the first seal 11 and the second seal 13 also improves the waterproof performance of the sealing ring 10 assembly, and also improves the accuracy of the sealing ring 10 assembly in detecting water ingress.
[0064] Specifically, if water enters the first sealing member 11, the user is reminded to return for repair as soon as possible; if water enters the second sealing member 13, the user is reminded to return for repair immediately, which can achieve the effect of early warning, thereby avoiding property loss of the user.
[0065] Specifically, the utility model does not need multiple water sensors to work continuously, but sets a switch through the water inlet detection circuit of the sealing ring 10 component, and performs inspections by opening and closing the switch. It does not need to work continuously to consume power, so the water inlet detection circuit of the sealing ring 10 component has low power consumption.
[0066] An embodiment of the utility model further provides an electrical device, comprising the battery assembly as described above, wherein the battery assembly is used to supply power to the electrical device.
[0067] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship of the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0068] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the present invention still fall within the scope covered by the present invention.
Claims
1. A sealing ring, characterized in that: The sealing ring is used for a battery assembly, which includes a shell and a cover plate arranged opposite to each other, and the shell has an opening; the sealing ring is used to be arranged between the shell and the cover plate, and the sealing ring is used to surround the opening. The sealing ring includes a first sealing member and a first conductor, and the first conductor is suitable for being electrically connected to a detection member.
2. The sealing ring according to claim 1, characterized in that: The sealing ring also includes a second sealing member and a second conductor arranged opposite to each other. The first sealing member, the first conductor, the second sealing member and the second conductor are arranged in sequence along a first direction. The first direction is the direction from the edge of the opening toward the center of the opening. The first sealing member, the first conductor, the second sealing member and the second conductor all surround the opening. The first conductor is electrically connected to the second conductor.
3. The sealing ring according to claim 2, characterized in that: The first sealing member has a first surface in a second direction, the second direction is the direction of the sealing ring toward the cover plate, the second sealing member has a second surface in the second direction, the first surface protrudes from a surface of the first conductor in the second direction and a surface of the second conductor in the second direction, the second surface protrudes from a surface of the first conductor in the second direction and a surface of the second conductor in the second direction, and the second direction intersects with the first direction.
4. The sealing ring according to claim 2, characterized in that: The sealing ring further comprises an insulating member, which is disposed around a side of the second sealing member facing away from the first sealing member, and is used to surround the opening.
5. The sealing ring according to claim 4, characterized in that: The second conductor passes through the insulating member.
6. The sealing ring according to claim 4, characterized in that: The sealing ring further includes a connecting wire, the connecting wire is electrically connected to the second conductor, and the connecting wire is passed through the insulating member.
7. A sealing ring assembly, characterized in that: It comprises a detection member and the sealing ring according to any one of claims 1 to 6, wherein the first conductor is electrically connected to the detection member.
8. The sealing ring assembly according to claim 7, characterized in that: The sealing ring assembly also includes a connecting wire, one end of which is electrically connected to the sealing ring, and the other end of which is electrically connected to the detection element.
9. The sealing ring assembly according to claim 8, characterized in that: The sealing ring assembly further comprises an electrical connector and a second conductor connected to each other, wherein the first conductor is electrically connected to the second conductor via the electrical connector, and the second conductor is electrically connected to the connecting wire.
10. A battery assembly, characterized in that: include: a housing having an opening; a cover plate, the cover plate being arranged opposite to the housing and used for closing the opening; The sealing ring assembly according to any one of claims 7 to 9, wherein the sealing ring assembly is arranged between the shell and the cover plate, and the sealing ring is used to close the gap between the shell and the cover plate.
11. The battery assembly according to claim 10, characterized in that: The battery assembly also includes a power supply, a switch, a second conductor, a first resistor, a second resistor, a third resistor and a fourth resistor. The first end of the switch is coupled to the negative electrode of the power supply, the second end of the switch is coupled to the first end of the second conductor, the second end of the second conductor is respectively coupled to the first end of the second resistor and the first end of the fourth resistor, the second end of the fourth resistor is coupled to the first end of the third resistor through the first conductor, the first end of the first resistor is coupled to the positive electrode of the power supply, and the second end of the first resistor is respectively coupled to the second end of the second resistor and the second end of the third resistor.
12. An electrical equipment, characterized in that: It comprises a battery assembly as described in any one of claims 10 to 11, wherein the battery assembly is used to supply power to the electrical device.