Battery cap assembly and battery thereof

Abstract

The utility model discloses a battery cap assembly. The battery cap assembly comprises a top cover assembly, a bottom cover assembly and a sealing ferrule, the bottom cover assembly comprises a bottom cover, an anti-explosion piece and a buffer gasket, the bottom cover is arranged in the sealing ferrule, and the anti-explosion piece and the buffer gasket are sequentially stacked in the bottom cover; the top cover assembly comprises a top cover, a resistance sensing element and a protective gasket, the protective gasket is arranged in the sealing ferrule, a placement groove is formed in the protective gasket, the resistance sensing element is arranged in the placement groove, and the top cover is connected with the resistance sensing element. According to the battery cap assembly disclosed by the utility model, the top cover assembly, the bottom cover assembly and the sealing ferrule are arranged, so that the resistance sensing element for sensing the temperature is placed and fixed by adopting the protective gasket, and the condition that the sensitivity of the resistance sensing element is reduced or fails due to the extrusion of other parts can be avoided; therefore, the overall temperature sensing precision and stability are improved, and the battery cap assembly can stably and effectively carry out disconnection operation on current when the battery is short-circuited.

Description

Technical Field

[0001] The utility model relates to a battery cap, in particular to a battery cap assembly and a battery thereof. Background Art

[0002] In the battery cap structure, when the battery temperature is too high due to a short circuit, the resistor protection element will inhibit the current, so that the working current is in a disconnected state, thereby playing a protective role. However, in the existing battery cap structure, the resistor protection element will reduce its sensitivity or fail due to the squeezing of various components, thereby reducing the sensitivity to the temperature inside the battery, and thus cannot provide stable and effective protection for the battery. Utility Model Content

[0003] The utility model aims to overcome the deficiencies in the prior art and to provide a battery cap assembly and a battery thereof which can improve the temperature sensing accuracy of a battery cap so that the current can be disconnected stably and effectively when the battery is short-circuited.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A battery cap assembly comprises: a top cover assembly, a bottom cover assembly and a sealing ring, wherein the top cover assembly is connected to the bottom cover assembly, and the top cover assembly and the bottom cover assembly are respectively arranged in the sealing ring;

[0006] The bottom cover assembly comprises a bottom cover, an explosion-proof disc and a buffer gasket, wherein the bottom cover is arranged in the sealing ring, the explosion-proof disc and the buffer gasket are sequentially stacked in the bottom cover, and a bending fixing portion is arranged on the bottom cover, and the bending fixing portion is pressed and fixed with the buffer gasket;

[0007] The top cover assembly includes a top cover, a resistance sensor element and a protection gasket, wherein the protection gasket is arranged in the sealing ring and abuts against the bent fixing portion, a placement groove is provided on the protection gasket, the resistance sensor element is arranged in the placement groove, the top cover is connected to the resistance sensor element, and the top cover and the resistance sensor element are arranged in alignment.

[0008] In one embodiment, a limit groove is provided inside the sealing ring.

[0009] In one embodiment, the explosion-proof disk is an aluminum diaphragm.

[0010] In one embodiment, the sealing ring is a rubber ring.

[0011] In one embodiment, a heat conducting convex portion is provided on a surface of the protective gasket close to the buffer gasket, and the heat conducting convex portion abuts against the buffer gasket.

[0012] In one embodiment, a first exhaust hole is formed in the heat conducting convex portion, a second exhaust hole is formed in the buffer gasket, and the first exhaust hole communicates with the second exhaust hole.

[0013] In one embodiment, the protective gasket is an iron ring gasket.

[0014] In one embodiment, the resistance sensing element is a PTC element.

[0015] In one embodiment, the resistance sensing element has an annular structure.

[0016] A battery includes the above-mentioned battery cap assembly and a battery cell, and the battery cap assembly is connected to the battery cell.

[0017] Compared with the prior art, the present utility model has at least the following advantages:

[0018] By providing a top cover assembly, a bottom cover assembly and a sealing ring in the battery cap assembly of the present utility model, the resistance sensing element for temperature sensing is placed and fixed by using a protective gasket, thereby avoiding the reduction or failure of the sensitivity of the resistance sensing element caused by the extrusion of other components, improving the overall temperature sensing accuracy and stability, and further enabling the battery cap assembly to stably and effectively disconnect the current when the battery is short-circuited. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below.

[0020] Figure 1 It is a schematic structural view of a battery cap assembly in an embodiment of the present utility model;

[0021] Figure 2 For Figure 1 The cross-sectional view of the battery cap assembly in;

[0022] Figure 3 For Figure 1 The exploded view of the battery cap assembly in. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. Combining Figure 1 、 Figure 2 With Figure 3As shown in the figure, a battery cap assembly 10 includes a top cover assembly 100, a bottom cover assembly 200, and a sealing ring 300. The top cover assembly 100 is connected to the bottom cover assembly 200, and the top cover assembly 100 and the bottom cover assembly 200 are respectively disposed within the sealing ring 300. In this way, the top cover assembly 100 and the bottom cover assembly 200 can be wrapped and fixed by the sealing ring 300, making the overall structure more compact. At the same time, it can play a certain buffering and protective role, and is convenient for subsequent packaging and shipping. In this embodiment, the sealing ring is a rubber ring, so it can play a certain buffering and protective role, and is convenient for the installation operation of the top cover assembly 100 and the bottom cover assembly 200.

[0024] Further, the bottom cover assembly 200 includes a bottom cover 210, an explosion-proof sheet 220, and a buffer gasket 230. The bottom cover 210 is disposed within the sealing ring 300. The explosion-proof sheet 220 and the buffer gasket 230 are stacked in the bottom cover 210 in sequence. A bending and fixing portion 211 is provided on the bottom cover 210, and the bending and fixing portion 211 is pressed and fixed with the buffer gasket 230. In this way, by placing the bottom cover 210 within the sealing ring 300, the bottom cover 210 can be placed and fixed. Then, the explosion-proof sheet 220 and the buffer gasket 230 are stacked in the bottom cover 210 in sequence, thus completing the installation operation of the bottom cover assembly 200. In order to fix the explosion-proof sheet 220 and the buffer gasket 230 within the bottom cover 210, by providing the bending and fixing portion 211 on the bottom cover 210, the bending and fixing portion 211 can be bent towards the buffer gasket 230 by a corresponding bending device, so that the bending and fixing portion 211 is pressed and fixed on the buffer gasket 230, thereby fixing the explosion-proof sheet 220 and the buffer gasket 230 within the bottom cover 210. In this embodiment, in order to improve the installation efficiency and accuracy of the bottom cover assembly 200, first, the explosion-proof sheet 220 and the buffer gasket 230 are stacked in the bottom cover 210 in sequence, and then the bottom cover 210, the explosion-proof sheet 220, and the buffer gasket 230 are made into an integral structure by extrusion bending. At this time, the bending and fixing portion 211 is pressed and fixed with the buffer gasket 230, so that the bottom cover 210, the explosion-proof sheet 220, and the buffer gasket 230 within the bottom cover assembly 200 are tightly combined together. After completing the extrusion bending operation, the bottom cover assembly 200 is placed within the sealing ring 300, thereby improving the efficiency and installation accuracy of the overall installation operation.

[0025] Furthermore, the top cover assembly 100 includes a top cover 110, a resistance sensing element 120, and a protective gasket 130. The protective gasket 130 is disposed within the sealing collar 300 and abuts against the bent fixing portion 211. An accommodation groove 131 is formed on the protective gasket 130, and the resistance sensing element 120 is disposed within the accommodation groove 131. The top cover 110 is connected to the resistance sensing element 120 and is arranged in alignment with the resistance sensing element 120. Thus, by installing the protective gasket 130 within the sealing collar 300, the installation operation of the top cover assembly 100 can be completed. The accommodation groove 131 is provided on the protective gasket 130, enabling the resistance sensing element 120 to be placed within the accommodation groove 131, thereby protecting the resistance sensing element 120 from being squeezed, which may cause a decrease in sensitivity or failure, and improving the safety performance of the battery product.

[0026] It should be noted that the top cover 110, the resistance sensing element 120, and the protective gasket 130 can be installed and fixed together by welding. Since the resistance sensing element 120 is placed within the accommodation groove 131 of the protective gasket 130, it can be prevented from being squeezed by other components, which may cause a decrease in sensitivity or failure. Thus, the overall temperature sensing accuracy and stability can be improved, enabling the battery cap assembly 10 to stably and effectively disconnect the current during a battery short circuit. Since the resistance sensing element 120 is disposed within the accommodation groove 131 of the protective gasket 130, when the protective gasket 130 abuts against the bent fixing portion 211 of the bottom cover 210, it can prevent the resistance sensing element 120 from coming into contact with the bottom cover 210, thereby protecting the resistance sensing element 120. In this embodiment, the resistance sensing element 120 is fixed within the accommodation groove 131 of the protective gasket 130 by welding. After completing the installation operation of the resistance sensing element 120, the top cover 110 is connected to the resistance sensing element 120 by welding. Thus, the top cover 110, the resistance sensing element 120, and the protective gasket 130 can form an integral structure, enhancing the overall structural strength of the top cover assembly 100. At the same time, it facilitates the installation of the top cover assembly 100 within the sealing collar 300, thereby improving the efficiency and accuracy of the overall installation operation.

[0027] By providing the top cover assembly 100, the bottom cover assembly 200, and the sealing collar 300, the battery cap assembly 10 of the present utility model uses the protective gasket 130 to place and fix the resistance sensing element 120 for temperature sensing. This can prevent the resistance sensing element 120 from being squeezed by other components, which may cause a decrease in sensitivity or failure, improving the overall temperature sensing accuracy and stability. Furthermore, the battery cap assembly 10 can stably and effectively disconnect the current during a battery short circuit.

[0028] As shown Figure 2 In one embodiment, a limiting card slot 310 is provided on the inner part of the sealing collar 300. In this way, the position of the installed parts can be limited, thereby providing the stability of the overall structure. For another example, the explosion-proof film is an aluminum film, so it can play a good role in pressure relief and protection.

[0029] In one embodiment, in combination with Figure 2 and Figure 3 As shown, on the side of the protective gasket 130 close to the buffer gasket 230, there is a heat-conducting convex part 131. The heat-conducting convex part 131 abuts against the buffer gasket 230. In this way, the heat at the buffer gasket 230 can be quickly conducted to the resistance sensing element 120 through the heat-conducting convex part 131, thereby improving the accuracy of temperature sensing. For another example, a first exhaust hole 131a is provided on the heat-conducting convex part 131, and a second exhaust hole 231 is provided on the buffer gasket 230. The first exhaust hole 131a is communicated with the second exhaust hole 231. In this way, when the gas generated by the short circuit inside the battery breaks through the explosion-proof film 220, the generated gas can be discharged from the second exhaust hole 231 and the first exhaust hole 131a to the top cover 110, and then discharged outwards through the pressure relief hole structure on the top cover 110, thereby playing a role in explosion-proof and pressure relief.

[0030] In one embodiment, the protective gasket is an iron ring gasket. In this way, it can not only play a good role in protecting the resistance sensing element 120, but also improve the efficiency of heat conduction, so that the resistance sensing element 120 can better sense the temperature. For another example, the resistance sensing element is a PTC element. In this way, when the temperature of the battery is too high due to short circuit, it can play a role in suppressing the current, so that the working current is in an off state, thereby protecting the battery. For another example, the resistance sensing element is a circular ring structure. In this way, it is convenient for the gas to be discharged when the explosion-proof film is broken by the gas, and the circular ring structure can provide the compactness of the overall structure of the product.

[0031] In one embodiment, a battery includes the above-mentioned battery cap assembly 10 and a battery cell. The battery cap assembly is connected to the battery cell. In this way, by installing the battery cap assembly 10 on the battery cell, the resistance sensing element 120 for sensing temperature can be placed and fixed through the protective gasket 130 of the battery cap assembly 10, thereby avoiding the sensitivity reduction or failure of the resistance sensing element 120 caused by the extrusion of other components, improving the overall temperature sensing accuracy and stability, and further enabling the battery to stably and effectively disconnect the current during short circuit.

[0032] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A battery cap assembly, characterized in that: include: A top cover assembly, a bottom cover assembly and a sealing ring, wherein the top cover assembly is connected to the bottom cover assembly, and the top cover assembly and the bottom cover assembly are respectively arranged in the sealing ring; The bottom cover assembly comprises a bottom cover, an explosion-proof disc and a buffer gasket, wherein the bottom cover is arranged in the sealing ring, the explosion-proof disc and the buffer gasket are sequentially stacked in the bottom cover, and a bending fixing portion is arranged on the bottom cover, and the bending fixing portion is pressed and fixed with the buffer gasket; The top cover assembly includes a top cover, a resistance sensor element and a protection gasket, wherein the protection gasket is arranged in the sealing ring and abuts against the bent fixing portion, a placement groove is provided on the protection gasket, the resistance sensor element is arranged in the placement groove, the top cover is connected to the resistance sensor element, and the top cover and the resistance sensor element are arranged in alignment.

2. The battery cap assembly according to claim 1, characterized in that: A limit groove is arranged inside the sealing ring.

3. The battery cap assembly according to claim 1, characterized in that: The explosion-proof disk is an aluminum diaphragm.

4. The battery cap assembly according to claim 1, characterized in that: The sealing ring is a rubber ring.

5. The battery cap assembly according to claim 1, characterized in that: A heat-conducting protrusion is arranged on a surface of the protection pad close to the buffer pad, and the heat-conducting protrusion abuts against the buffer pad.

6. The battery cap assembly according to claim 5, characterized in that: The heat-conducting protrusion is provided with a first exhaust hole, the buffer pad is provided with a second exhaust hole, and the first exhaust hole is communicated with the second exhaust hole.

7. The battery cap assembly according to claim 1 or 5, characterized in that: The protective gasket is an iron ring gasket.

8. The battery cap assembly according to claim 1, characterized in that: The resistance sensing element is a PTC element.

9. The battery cap assembly according to claim 1, characterized in that: The resistance sensing element is a circular ring structure.

10. A battery, comprising the battery cap assembly according to any one of claims 1 to 9, characterized in that: A battery cell is also included, and the battery cap assembly is connected to the battery cell.

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