Battery top cover assembly and battery

Abstract

The utility model provides a battery top cover assembly and a battery wherein the battery top cover assembly comprises: an explosion-proof structure electrically connected with a first pole of the battery; the flexible part and the explosion-proof structure are arranged at an interval; the heating element is electrically connected with a second pole of the battery and connected with the flexible part, when the pressure of the battery reaches a preset value, the flexible part deforms under the action of the pressure of the battery and drives the heating element to be in contact with the anti-explosion structure for conduction, and the heating element is electrified, heats and melts the anti-explosion structure. According to the utility model, the problem that the anti-explosion valve on the battery in the prior art can reduce the structural strength of the battery is solved.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and more specifically, to a battery top cover assembly and a battery. Background Technology

[0002] Existing batteries are prone to gas generation during storage. This gas generation leads to internal pressure within the battery. When this pressure reaches a certain critical value, it can easily rupture the explosion-proof valve. Once the valve ruptures, electrolyte leakage occurs, exposing a large area of ​​electrolyte to air and water, causing safety issues. Currently, mechanical explosion-proof valves are generally used. When the internal pressure of the battery becomes too high, the pressure will rupture the valve, thus releasing the pressure. However, traditional explosion-proof valves reduce the structural strength of the battery. Utility Model Content

[0003] The main objective of this invention is to provide a battery top cover assembly and a battery to solve the problem that the explosion-proof valve on the battery in the prior art reduces the structural strength of the battery.

[0004] To achieve the above objectives, according to one aspect of the present invention, a battery top cover assembly is provided, comprising: an explosion-proof structure electrically connected to a first terminal post of the battery; a flexible portion, wherein the flexible portion and the explosion-proof structure are spaced apart; and a heating element electrically connected to a second terminal post of the battery, wherein the heating element is connected to the flexible portion, and when the battery pressure reaches a preset value, the flexible portion deforms under the action of the battery pressure and drives the heating element to contact and conduct with the explosion-proof structure, thereby energizing and heating the heating element and melting the explosion-proof structure.

[0005] Furthermore, along the direction from the battery casing toward the electrode assembly, the explosion-proof structure, the heating element, and the flexible part are arranged in sequence.

[0006] Furthermore, the battery top cover assembly also includes: a top cover, which covers the opening of the battery casing, and an explosion-proof structure is installed inside the top cover; and a lower plastic, which is stacked with the top cover and located on the side of the top cover closer to the electrode assembly. Both the top cover and the lower plastic have explosion-proof holes, a portion of the explosion-proof structure is located inside the explosion-proof holes, a flexible part is located at the bottom of the explosion-proof holes, and a heating element is located inside the explosion-proof holes.

[0007] Furthermore, the flexible part is connected to the lower surface of the lower plastic.

[0008] Furthermore, the flexible part is integrally molded with the lower plastic part.

[0009] Furthermore, the flexible part is a sealing flexible part, which seals the bottom of the explosion-proof hole.

[0010] Furthermore, the battery top cover assembly also includes wires that pass through the lower plastic and whose two ends are electrically connected to the heating element and the second pole, respectively.

[0011] Furthermore, both the top cover and the lower plastic have a first clearance hole and a second clearance hole, the first pole and the second pole extend out from the first clearance hole and the second clearance hole respectively, and the explosion-proof hole is located between the first clearance hole and the second clearance hole.

[0012] Furthermore, when the flexible part does not deform, a gap is set between the heating element and the explosion-proof structure.

[0013] According to another aspect of the present invention, a battery is provided, including a housing, an electrode assembly and the aforementioned battery top cover assembly, wherein the battery top cover assembly covers the opening of the housing, and the electrode assembly is disposed inside the housing.

[0014] By applying the technical solution of this utility model, an explosion-proof structure, a flexible part, and a heating element are set on the battery top cover assembly. These components work together to achieve the effect of monitoring the internal pressure of the battery. Specifically, the explosion-proof structure is electrically connected to the first terminal of the battery. This structure is designed to withstand the high pressure inside the battery. When the pressure does not reach a preset value, the explosion-proof structure is in a closed state to prevent electrolyte leakage and the entry of external gases. Since the flexible part itself can deform, it can deform when the internal pressure of the battery increases. At the same time, the heating element connected to the flexible part and electrically connected to the second terminal of the battery works together. Thus, as the internal pressure of the battery gradually increases, the deformation of the flexible part gradually increases, and the heating element gradually moves closer to the explosion-proof structure until the internal pressure of the battery reaches the preset value. At this time, the heating element contacts the explosion-proof structure and conducts electricity. At this time, the heating element forms a circuit, and the heating element is energized and heats up, thereby melting the explosion-proof structure and realizing the pressure relief of the battery. In this way, on the one hand, through the deformation of the flexible part and the intelligent control of the heating element, early warning and pressure relief are provided when the internal pressure of the battery reaches a certain level, avoiding the risk of electrolyte leakage and explosion. On the other hand, since the explosion-proof structure controls opening and closing through melting, it avoids the excessive impact force of traditional opening and closing mechanisms, ensuring that the explosion-proof structure does not adversely affect the structural strength of the battery, thereby extending the battery's lifespan. Simultaneously, because the heat generated by the heating element is positively correlated with the battery's voltage and charge, the degree of melting of the explosion-proof structure can be controlled according to the actual state of the battery, achieving controllable pressure relief and improving the battery's safety and reliability. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0016] Figure 1 This diagram shows a structural schematic of the battery top cover assembly of Embodiment 1 of the present invention when it is installed on the battery;

[0017] Figure 2 It shows Figure 1 A schematic diagram of the flexible part under pressure.

[0018] Figure 3 This diagram shows a schematic of the battery top cover assembly of Embodiment 2 of the present invention when it is installed on the battery.

[0019] The above figures include the following reference numerals:

[0020] 10. Battery; 11. First terminal; 12. Second terminal; 20. Explosion-proof structure; 30. Flexible part; 40. Heating element; 50. Top cover; 51. Explosion-proof hole; 60. Lower plastic; 70. Wire. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0024] To address the issue that explosion-proof valves on batteries in the prior art reduce the structural strength of the battery, this application provides a battery top cover assembly and a battery.

[0025] Example 1

[0026] like Figure 1 and Figure 2 As shown, a battery top cover assembly of this embodiment includes: an explosion-proof structure 20 electrically connected to the first terminal 11 of the battery 10; a flexible part 30, which is spaced apart from the explosion-proof structure 20; and a heating element 40 electrically connected to the second terminal 12 of the battery 10. The heating element 40 is connected to the flexible part 30. When the pressure of the battery 10 reaches a preset value, the flexible part 30 deforms under the pressure of the battery 10 and drives the heating element 40 to contact and conduct with the explosion-proof structure 20. The heating element 40 is energized, heats up, and melts the explosion-proof structure 20.

[0027] This embodiment achieves the effect of monitoring the internal pressure of the battery 10 by incorporating an explosion-proof structure 20, a flexible part 30, and a heating element 40 on the battery top cover assembly. Specifically, the explosion-proof structure 20 is electrically connected to the first terminal 11 of the battery 10. This structure is designed to withstand the high pressure inside the battery 10. When the pressure does not reach a preset value, the explosion-proof structure 20 is in a closed state to prevent electrolyte leakage and the entry of external gas. Since the flexible part 30 is deformable, it can deform when the internal pressure of the battery 10 increases. Simultaneously, the heating element 40, connected to the flexible part 30 and electrically connected to the second terminal 12 of the battery 10, ensures that as the internal pressure of the battery 10 gradually increases, the deformation of the flexible part 30 gradually increases, and the heating element 40 gradually moves closer to the explosion-proof structure 20 until the internal pressure of the battery 10 reaches the preset value. Figure 2 As shown, the heating element 40 contacts and conducts electricity with the explosion-proof structure 20, forming a circuit. The heating element 40 is energized and heats up, melting the explosion-proof structure 20 and thus releasing pressure from the battery 10. In this way, on the one hand, through the deformation of the flexible part 30 and the intelligent control of the heating element 40, early warning and pressure release are provided when the internal pressure of the battery 10 reaches a certain level, avoiding the risk of electrolyte leakage and explosion. On the other hand, since the explosion-proof structure 20 controls its opening and closing through melting, the excessive impact force of traditional opening and closing is avoided, ensuring that the form of the explosion-proof structure 20 does not adversely affect the structural strength of the battery 10, thereby extending the service life of the battery 10. Simultaneously, since the heat generated by the heating element 40 is positively correlated with the voltage and charge of the battery 10, the degree of melting of the explosion-proof structure 20 can be controlled according to the actual state of the battery 10, achieving controllable pressure release and improving the safety and reliability of the battery 10.

[0028] like Figure 1As shown, in this embodiment, the explosion-proof structure 20, the heating element 40, and the flexible part 30 are arranged sequentially along the direction from the casing of the battery 10 to the electrode assembly. Since the battery top cover assembly is usually located above the battery 10, the direction along the battery 10 casing towards the electrode assembly in this embodiment is from top to bottom. Therefore, the above arrangement means that the explosion-proof structure 20, the heating element 40, and the flexible part 30 are arranged sequentially from top to bottom. A gap is formed between the explosion-proof structure 20 and the flexible part 30 at their upper and lower positions. The lower surface of the heating element 40 is connected to the upper surface of the flexible part 30 and is located within the gap. When the flexible part 30 is not deformed, the upper surface of the heating element 40 and the explosion-proof structure 20 are separated by a gap and do not contact each other. In this way, when the pressure of the battery 10 below increases, the pressure of the battery 10 acts upward on the lower surface of the flexible part 30, causing the flexible part 30 to deform upward. This causes the heating element 40 above to move upward and come into contact with the explosion-proof structure 20, thus forming a conductive circuit between the first electrode post 11, the explosion-proof structure 20, the heating element 40, and the second electrode post 12. The heating element 40 is energized and heats up, achieving the effect of melting the explosion-proof structure 20.

[0029] Of course, in addition to the above-mentioned arrangement, other arrangements can also be used, such as arranging the heating element 40, the explosion-proof structure 20 and the flexible part 30 from top to bottom. The upward extension arm of the flexible part 30 passes through the explosion-proof structure 20 and connects with the heating element 40. There is a certain transmission and cooperation between the extension arm and the heating element 40, so that when the flexible part 30 deforms upward, the heating element 40 moves downward and comes into contact with and melts with the explosion-proof structure 20.

[0030] In this embodiment, the heating element 40 is a heating resistor. When energized, the heating resistor generates heat based on its structural characteristics, thereby melting the explosion-proof structure 20. Of course, the heating element 40 can also be any other heat-generating component.

[0031] Optionally, the flexible part 30 can be made of a material with elastic deformation capability, which can generate corresponding deformation when the internal pressure of the battery 10 increases. Since the contact timing between the heating element 40 and the explosion-proof structure 20 is affected by factors such as the ease of deformation of the flexible part 30, the melting point of the explosion-proof structure 20, the heat generation of the heating element 40, and the initial distance between the heating element 40 and the explosion-proof structure 20, the preset value can be adjusted during the design by adjusting the material and thickness of the flexible part 30, the melting point of the material of the explosion-proof structure 20, the type of the heating element 40 and the heat generation per unit voltage, and the initial relative distance between the heating element 40 and the explosion-proof structure 20, thereby achieving controllable battery pressure relief.

[0032] like Figure 1As shown, in this embodiment, the battery top cover assembly further includes a top cover 50 and a lower plastic 60. The top cover 50 covers the opening of the battery 10's casing. That is, the top cover 50 is the main body of the battery top cover assembly, tightly covering the opening of the battery 10's casing, serving to seal and protect the battery 10. The top cover 50 has a through-hole through which the explosion-proof structure 20 passes and an explosion-proof hole 51 corresponding to the explosion-proof structure 20. One end of the explosion-proof structure 20 can pass through the through-hole and connect to the first terminal 11 of the battery 10, while the other end extends out of the through-hole and into one side of the explosion-proof hole 51, continuing to extend to the other side of the explosion-proof hole 51. Thus, the explosion-proof structure 20 passes through the explosion-proof hole 51 of the top cover 50 and can completely block the explosion-proof hole 51, ensuring a timely response when the pressure abnormally increases. The lower plastic 60 is stacked on top of the top cover 50, located on the side of the top cover 50 closest to the electrode assembly, which in this embodiment is below the top cover 50. It also has an explosion-proof hole 51 corresponding to the explosion-proof structure 20. The explosion-proof holes 51 of the lower plastic 60 and the top cover 50 are aligned to form a stable structure, ensuring the fixed position of the explosion-proof structure 20. The flexible part 30 is located at the bottom of the explosion-proof hole 51 and has good elastic deformation capability, capable of deforming accordingly when the internal pressure of the battery 10 changes. The heating element 40 is located inside the explosion-proof hole 51 and is in contact with the flexible part 30. This allows the explosion-proof structure 20 to perform its sealing function, while the flexible part 30, in conjunction with the heating element 40, melts the explosion-proof structure 20 according to pressure, and also protects the internal heating element 40.

[0033] like Figures 1 to 2 As shown, in this embodiment, the flexible part 30 and the lower plastic 60 are two independent components, which are processed separately and then connected together after processing. The edge of the flexible part 30 is outside the orthogonal projection range of the explosion-proof hole 51, so the flexible part 30 can be connected to the lower surface of the lower plastic 60 through this edge.

[0034] Optionally, the flexible part 30 can be connected to the lower surface of the lower plastic 60 by adhesive bonding. This involves using a suitable adhesive to bond the upper surface of the flexible part 30 to the lower surface of the lower plastic 60. In this case, the flexible part 30 protrudes from the lower surface of the lower plastic 60. This provides good sealing, ensuring the seal and strength of the connection and preventing leakage of electrolyte and gas. Furthermore, the adhesive bonding structure is stable, ensuring that the flexible part 30 remains in close contact with the lower plastic 60 during deformation and will not detach. Alternatively, an embedded connection can be used. The lower plastic 60 is designed with an insert groove that matches the shape of the flexible part 30 during manufacturing. During assembly, the flexible part 30 is embedded into the groove of the lower plastic 60 and secured by interference fit or additional fixing devices such as clamps or clips. In this case, the flexible part 30 does not protrude from the lower surface of the lower plastic 60. Embedded connections provide good deformation space while maintaining the positioning of the flexible part 30. The connection method is simple and easy to implement. Alternatively, a mechanical fastening connection can be used, employing screws, bolts, rivets, or clips to fix the flexible part 30 to a specific position on the lower plastic 60. Mechanical fastening offers high versatility and flexibility, applicable to various materials, and the connection points are easy to inspect and maintain. Of course, the above connection methods are merely illustrative examples of this embodiment and are not limited to any particular method, as long as they meet the requirements of connection reliability and sealing.

[0035] In this embodiment, the flexible part 30 is a gas-impermeable sealing flexible part that seals the bottom of the explosion-proof hole 51. Specifically, the explosion-proof hole 51 in this embodiment is a circular hole, and the flexible part 30 also has a circular structure, with a size larger than that of the explosion-proof hole 51 on the lower plastic 60. This ensures that when the flexible part 30 is aligned with the axis of the explosion-proof hole 51, the outer edge of the flexible part 30 is located 360 degrees around the lower surface of the lower plastic 60. The flexible part 30 can then connect with the lower plastic 60 through this 360-degree outer edge, while also ensuring the sealing effect of the flexible part 30 on the explosion-proof hole 51. This allows the internal pressure of the battery 10 to be fully applied to the flexible part 30, preventing pressure leakage and potential safety accidents. The design of the sealing flexible part 30 ensures that the bottom of the explosion-proof hole 51 remains sealed until the trigger pressure is reached, preventing leakage of internal substances such as electrolyte and gas. At the same time, when the pressure rises to a certain value, it can respond accurately and in a timely manner, driving the heating element 40 through deformation. In this way, the sealing flexible part 30 and the heating element 40 work together to achieve intelligent pressure release.

[0036] Optionally, the material of the sealing flexible part 30 should not only have good elastic deformation capacity but also high resistance to electrolyte corrosion to ensure sufficient sealing during deformation.

[0037] like Figure 1 and Figure 2 As shown, in this embodiment, the battery top cover assembly also includes a wire 70, which passes through the lower plastic 60. The two ends of the wire 70 are electrically connected to the heating element 40 and the second terminal 12, respectively. Specifically, a wiring hole is provided inside the lower plastic 60 near the second terminal 12, through which the wire 70 passes, connecting one end to the second terminal 12 and the other end to the heating element 40, thus establishing a conductive connection between the heating element 40 and the second terminal 12. In this way, the wire 70 acts as an electrical bridge between the battery 10 and the heating element 40, achieving electrical conductivity between them. When the heating element 40 contacts the explosion-proof structure 20, a circuit can be formed through the first terminal 11, the explosion-proof structure 20, the heating element 40, the wire 70, and the second terminal 12, enabling the heating element 40 to receive electricity and generate heat. Meanwhile, the way the wire 70 is installed inside the lower plastic 60, combined with the way the explosion-proof structure 20 is installed inside the top cover 50, ensures that the wire 70 and the explosion-proof structure 20 are installed inside the top cover 50 and the lower plastic 60 on the upper and lower sides, respectively. This ensures that the wire 70 and the explosion-proof structure 20 do not interfere with each other, avoids the possibility of accidental circuit continuity, and ensures accuracy.

[0038] Optionally, the wire 70 should be made of a material with high conductivity, high temperature resistance, and corrosion resistance, such as copper, silver-plated copper wire, or stainless steel wire, to ensure the reliability of current transmission and the normal operation of the heating element 40 in the working environment of the battery 10. Wiring holes can be pre-embedded during the molding of the lower plastic 60 or achieved through subsequent processing such as drilling or slotting. This ensures a stable connection between the wire 70 and the heating element 40 and the second terminal 12 after the wire 70 is inserted into the lower plastic 60, while avoiding any impact on the strength of the lower plastic 60 structure. The connection between the wire 70 and the heating element 40 can be achieved by welding or crimping to ensure the strength of the connection and the stability of its electrical performance, preventing abnormal operation of the heating element 40 due to poor connection. Simultaneously, the connection between the wire 70 and the second terminal 12 can be achieved through mechanical fastening, welding, or crimping to ensure the reliability and safety of the connection point within the operating temperature range of the battery 10. The above configuration is merely an exemplary example of this embodiment and is not limited to the material selection or configuration methods described above, as long as the reliability of the connection and the normal operation of the heating element 40 are satisfied.

[0039] like Figure 1 and Figure 2As shown, in this embodiment, both the top cover 50 and the lower plastic 60 have a first clearance hole and a second clearance hole. The first clearance hole and the second clearance hole are used to cooperate with the first pole post 11 and the second pole post 12, so that the first pole post 11 and the second pole post 12 can extend out of the top cover 50 through the first clearance hole and the second clearance hole, respectively, thereby realizing the connection with other components such as the busbar. In this embodiment, the explosion-proof hole 51 is located between the first clearance hole and the second clearance hole, and is preferably located at the exact midpoint of the line connecting the first clearance hole and the second clearance hole. In this way, the explosion-proof hole 51 is located between the two clearance holes. This layout design makes the distance from the explosion-proof structure 20 to the first pole post 11 basically equal to the distance from the heating element 40 to the second pole post 12, so that the explosion-proof structure 20 and the wire 70 can be conveniently arranged without crossing or spiraling, thereby simplifying the arrangement difficulty. Of course, the location of the explosion-proof hole 51 can also be adjusted as needed. For example, the first clearance hole, the second clearance hole, and the explosion-proof hole 51 can be arranged in sequence on the surface of the top cover 50. In this case, the explosion-proof structure 20 needs to be bent to a certain extent or a through hole needs to be opened to avoid the second pole post 12 and the wire 70, so as to ensure that the explosion-proof structure 20 will not come into contact or interfere with the second pole post 12 and the wire 70.

[0040] Optionally, the first and second clearance holes should be designed as circular holes that match the diameters of the first electrode post 11 and the second electrode post 12, and the hole walls should be smooth to reduce friction and wear during electrode post insertion, while maintaining good electrical contact. In this embodiment, the first and second clearance holes are symmetrically arranged around the explosion-proof hole 51. Their positions and dimensions can also be rearranged according to the actual battery 10 structure or other design requirements, as long as it is ensured that their dimensions and positions allow for smooth insertion of the relevant structures and timely gas release in case of abnormal pressure increases.

[0041] Another embodiment of this invention provides a battery including a housing, an electrode assembly, and the aforementioned battery top cover assembly. The battery top cover assembly covers the opening of the housing, and the electrode assembly is disposed inside the housing. This battery, through its integrated battery top cover assembly, ensures a timely response in the event of a battery malfunction, guaranteeing the battery's safety and stable operation. It also simplifies the battery manufacturing process and improves the battery's adaptability.

[0042] Example 2

[0043] The difference from Embodiment 1 is that the way the flexible part 30 and the lower plastic 60 are fitted is different.

[0044] like Figure 3As shown, in this embodiment, the flexible part 30 and the lower plastic 60 are not two independent components, but are integrally molded together, making them a single unit. Since the material of the lower plastic 60 also has a certain degree of deformation capability, the flexible part 30 and the lower plastic 60 can be injection molded together using methods such as integral injection molding. Because the thickness of the flexible part 30 is thinner than other parts of the lower plastic 60, the flexible part 30 has a stronger deformation capability. This integral molding arrangement of the flexible part 30 and the lower plastic 60 eliminates connection points between components, reduces potential leakage points, and improves the sealing performance of the component. Furthermore, it simplifies the manufacturing process; the integral molding design allows the flexible part 30 and the lower plastic 60 to be molded in one step, avoiding subsequent assembly steps and reducing the complexity and cost of the manufacturing process. Simultaneously, the tight connection between the flexible part 30 and the lower plastic 60 ensures the structural stability and reliability of the component when facing changes in internal pressure of the battery 10, preventing performance degradation due to unstable connections.

[0045] It should be noted that "multiple" in the above embodiments refers to at least two.

[0046] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0047] 1. Through the deformation of the flexible part and the intelligent control of the heating element, when the internal pressure of the battery reaches a certain level, an early warning is given and pressure is released, avoiding the risk of electrolyte leakage and explosion.

[0048] 2. The explosion-proof structure controls opening and closing through melting, thus avoiding the excessive impact force of traditional opening and closing. This ensures that the explosion-proof structure does not adversely affect the structural strength of the battery, thereby extending the battery's lifespan. The degree of melting of the explosion-proof structure is controlled according to the actual state of the battery, achieving controllable pressure relief and improving the battery's safety and reliability.

[0049] 3. The wires and explosion-proof structure are respectively installed in the top cover and the lower plastic on the upper and lower sides, so as to ensure that the wires and explosion-proof structure do not affect each other, avoid accidental circuit continuity, and ensure accuracy.

[0050] 4. The explosion-proof hole is set between two clearance holes. This layout design makes the distance from the explosion-proof structure to the first pole and the distance from the heating element to the second pole basically equal. This allows the explosion-proof structure and wires to be arranged conveniently without crossing or turning, thus simplifying the arrangement.

[0051] 5. The integrated molding of the flexible section and the lower plastic layer eliminates connection points between components, reducing potential leakage points and improving the module's sealing performance. Furthermore, it simplifies the manufacturing process; the integrated design allows the flexible section and lower plastic layer to be molded in a single step, avoiding subsequent assembly steps and reducing manufacturing complexity and cost. Simultaneously, the tight bond between the flexible section and the lower plastic layer ensures the structural stability and reliability of the module when facing changes in internal battery pressure, preventing performance degradation caused by unstable connections.

[0052] 6. The explosion-proof hole is positioned between two clearance holes. This layout ensures that the explosion-proof structure, heating element, and flexible part located within the explosion-proof hole can operate effectively when the internal pressure of the battery increases, while avoiding direct contact with the terminals and reducing the risk of electrical short circuits. This symmetrical layout also helps maintain the structural balance of the battery top cover and improves the overall stability of the assembly.

[0053] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0054] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0055] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0056] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery top cover assembly, characterized in that, include: An explosion-proof structure (20) electrically connected to the first terminal (11) of the battery (10); A flexible part (30) is provided at an interval between the flexible part (30) and the explosion-proof structure (20); A heating element (40) is electrically connected to the second terminal (12) of the battery (10). The heating element (40) is connected to the flexible part (30). When the pressure of the battery (10) reaches a preset value, the flexible part (30) deforms under the pressure of the battery (10) and drives the heating element (40) to contact and conduct with the explosion-proof structure (20). The heating element (40) is energized and heats up, melting the explosion-proof structure (20).

2. The battery top cover assembly according to claim 1, characterized in that, Along the direction from the casing of the battery (10) to the electrode assembly, the explosion-proof structure (20), the heating element (40), and the flexible part (30) are arranged in sequence.

3. The battery top cover assembly according to claim 1, characterized in that, The battery top cover assembly also includes: Top cover (50), the top cover (50) covers the opening of the housing of the battery (10), and the explosion-proof structure (20) passes through the top cover (50); The lower plastic (60) is stacked with the top cover (50) and located on the side of the top cover (50) near the electrode assembly. Both the top cover (50) and the lower plastic (60) have explosion-proof holes (51). A part of the explosion-proof structure (20) is located inside the explosion-proof hole (51). The flexible part (30) is located at the bottom of the explosion-proof hole (51). The heating element (40) is located inside the explosion-proof hole (51).

4. The battery top cover assembly according to claim 3, characterized in that, The flexible part (30) is connected to the lower surface of the lower plastic (60).

5. The battery top cover assembly according to claim 3, characterized in that, The flexible part (30) is integrally formed with the lower plastic (60).

6. The battery top cover assembly according to claim 3, characterized in that, The flexible part (30) is a sealing flexible part, which seals the bottom of the explosion-proof hole (51).

7. The battery top cover assembly according to claim 3, characterized in that, The battery top cover assembly also includes a wire (70), which passes through the lower plastic (60) and is electrically connected at both ends to the heating element (40) and the second pole (12), respectively.

8. The battery top cover assembly according to claim 3, characterized in that, The top cover (50) and the lower plastic (60) both have a first clearance hole and a second clearance hole. The first pole post (11) and the second pole post (12) extend from the first clearance hole and the second clearance hole, respectively. The explosion-proof hole (51) is disposed between the first clearance hole and the second clearance hole.

9. The battery top cover assembly according to claim 1, characterized in that, When the flexible part (30) does not deform, a gap is provided between the heating element (40) and the explosion-proof structure (20).

10. A battery, characterized in that, The device includes a housing, an electrode assembly, and a battery top cover assembly according to any one of claims 1 to 9, wherein the battery top cover assembly covers the opening of the housing, and the electrode assembly is disposed inside the housing.

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