Battery top cover and battery monomer

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover and a battery monomer, the battery top cover comprises a top cover sheet, a heat sensitive element and a waterproof ventilation element, the top cover sheet is used for covering an opening of a battery shell, the top cover sheet is provided with a first exhaust hole, the heat sensitive element comprises a heat sensitive film, the heat sensitive film is plugged in the first exhaust hole, and the waterproof ventilation element is arranged on the top cover sheet. The waterproof breathable element comprises a base body and a waterproof breathable portion, the base body is located on the side, away from the battery shell, of the thermosensitive film and plugged in the first exhaust hole, the base body is provided with an exhaust heat dissipation channel, and the two ends of the exhaust heat dissipation channel are located on the side, facing the thermosensitive film, of the base body and the side, away from the thermosensitive film, of the base body respectively. According to the battery top cover, not only can the probability of slight deformation and expansion before the thermosensitive film is broken be reduced, but also the sealing performance of the battery top cover after the thermosensitive film is broken can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery top cover and battery monomer. BACKGROUND

[0002] Power battery has been widely applied in electric automobile, energy storage, aerospace and other fields, and its safety problem is more and more outstanding.

[0003] In order to improve the safety of power battery, the prior art sets heat-sensitive film on the top cover sheet of the battery, when the temperature inside the battery shell rises to a certain value, the heat-sensitive film breaks, so that the high-pressure gas in the battery shell is discharged through the heat-sensitive film, and the effect of efficient heat dissipation can also be achieved.

[0004] But in actual application, when the temperature inside the battery rises, but has not reached the temperature value of heat-sensitive film breakage, the heat-sensitive film will slightly deform and expand, the deformation of heat-sensitive film will reduce its sealing between the top cover sheet, and then the problem of water and electrolyte leakage in the battery shell appears, the expansion of heat-sensitive film changes its breakage temperature value, when the temperature inside the battery reaches the breakage temperature of heat-sensitive film without expansion, the heat-sensitive film does not break, the reliability of heat-sensitive film exhaust heat dissipation is reduced, and the safety of power battery is reduced.

[0005] Therefore, it is urgent to provide a battery top cover and battery monomer to solve the above technical problems. UTILITY MODEL CONTENTS

[0006] The first purpose of the utility model is to provide a battery top cover, which can not only reduce the probability of slight deformation and expansion of heat-sensitive film before breakage, but also improve the sealing of battery top cover after breakage of heat-sensitive film.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] The battery top cover comprises:

[0009] The top cover sheet is used for covering the opening of the battery shell, and the top cover sheet is provided with a first exhaust hole;

[0010] The heat-sensitive element comprises a heat-sensitive film, the heat-sensitive film is blocked in the first exhaust hole, and the heat-sensitive film can break in a high-temperature environment;

[0011] The waterproof and breathable element comprises a base body and a waterproof and breathable part, the base body is sealed in the first exhaust hole, and the base body is located on the side of the heat-sensitive film away from the battery shell; the base body is provided with an exhaust and heat dissipation channel, one end of the exhaust and heat dissipation channel is located on the side of the base body facing the heat-sensitive film, and the other end of the exhaust and heat dissipation channel is located on the side of the base body away from the heat-sensitive film; and the waterproof and breathable part is sealed in the exhaust and heat dissipation channel.

[0012] Optionally, the heat-sensitive element further comprises a sealing ring, the hole wall of the first exhaust hole is provided with a first protruding part, the first protruding part extends along the circumference of the first exhaust hole and is connected at the head and tail, and the heat-sensitive film presses the sealing ring against the side of the first protruding part away from the battery shell.

[0013] Optionally, the heat-sensitive element further comprises a gasket, the gasket is clamped between the heat-sensitive film and the sealing ring.

[0014] Optionally, the side of the heat-sensitive film facing the gasket is provided with a first groove, and the gasket is embedded in the first groove.

[0015] Optionally, the side of the first protruding part facing the heat-sensitive film is provided with an annular groove, the annular groove is coaxial with the first exhaust hole, and the sealing ring is pressed and embedded in the annular groove by the heat-sensitive film.

[0016] Optionally, the base body comprises a first base body part and a second base body part, the first base body part is provided with a second exhaust hole, the second base body part is connected with the first base body part, the second base body part is provided with a third exhaust hole, and the third exhaust hole is communicated with the second exhaust hole and forms the exhaust and heat dissipation channel.

[0017] Optionally, the hole wall of the first exhaust hole is further provided with a second protruding part, the second protruding part extends along the circumference of the first exhaust hole and is connected at the head and tail, and the edge of the first base body part is pressed on the side of the second protruding part away from the battery shell.

[0018] Optionally, the first base body part is further provided with a second groove, the second exhaust hole is arranged in the groove bottom of the second groove, the second base body part is arranged in the second groove, the hole wall of the first exhaust hole is further provided with a third protruding part, the third protruding part extends along the circumference of the first exhaust hole and is connected at the head and tail, the third protruding part is located between the first protruding part and the second protruding part, and the edge of the heat-sensitive film is clamped between the edge of the second groove and the third protruding part.

[0019] Optionally, the edge of the first exhaust hole is provided with a fourth protruding part, the fourth protruding part extends along the circumference of the first exhaust hole and is connected at the head and tail, the fourth protruding part is located on the side of the top cover sheet away from the battery shell, along the circumference of the first exhaust hole, and the first base body part is sealingly welded with the fourth protruding part.

[0020] The second purpose of the utility model is to provide a battery monomer which has higher use safety.

[0021] To achieve this objective, the present invention adopts the following technical solution:

[0022] A battery cell includes a battery cell, a battery casing, and the aforementioned battery top cover. The battery cell is disposed inside the battery casing, and the top cover is disposed at the opening of the battery casing.

[0023] The beneficial effects of this utility model are:

[0024] The battery top cover provided by this utility model has a thermally sensitive film sealed inside the first vent hole of the top cover sheet. The waterproof and breathable element includes a substrate and a waterproof and breathable part. The substrate is sealed inside the first vent hole and is located on the side of the thermally sensitive film away from the battery casing. The substrate has a venting and heat dissipation channel, with one end of the venting and heat dissipation channel located on the side of the substrate facing the thermally sensitive film and the other end located on the side of the substrate away from the thermally sensitive film. The waterproof and breathable part is sealed inside the venting and heat dissipation channel. The waterproof and breathable part has good breathability, thus achieving the effect of ventilation to the inside of the battery casing and dissipating heat from the battery casing, thereby reducing the probability of slight deformation and expansion of the thermally sensitive film before it breaks, improving the sealing performance between the thermally sensitive film and the top cover sheet, and improving the reliability of the thermally sensitive film's venting and heat dissipation. Furthermore, even if the thermally sensitive film undergoes slight deformation before it breaks, thereby reducing the sealing performance between the thermally sensitive film and the top cover sheet, the waterproof and breathable part can prevent the leakage of moisture and electrolyte from the battery casing, achieving the effect of improving the sealing performance of the battery top cover. Furthermore, after the thermal film breaks, the waterproof and breathable part can prevent moisture and electrolyte from leaking out of the battery case, thus improving the sealing performance of the battery top cover. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the battery top cover provided by this utility model;

[0026] Figure 2 This is a cross-sectional structural diagram of the battery top cover provided by this utility model;

[0027] Figure 3 yes Figure 2 Larger image of part A in the middle;

[0028] Figure 4 This is a partially enlarged cross-sectional view of the top cover plate provided by this utility model;

[0029] Figure 5 This is a cross-sectional structural diagram of the thermal film provided by this utility model;

[0030] Figure 6 This is a cross-sectional structural diagram of the first base portion provided by this utility model.

[0031] In the picture:

[0032] 100, top cover sheet; 110, first vent hole; 111, first protrusion; 1111, annular groove; 112, second protrusion; 113, third protrusion; 114, fourth protrusion; 200, heat-sensitive element; 210, heat-sensitive adhesive sheet; 211, first groove; 212, boss; 220, sealing ring; 230, gasket; 300, waterproof and air-permeable element; 310, base body; 311, air exhaust and heat dissipation channel; 312, first base body part; 3121, second vent hole; 3122, second groove; 313, second base body part; 3131, third vent hole; 320, waterproof and air-permeable part; 400, plastic part. DETAILED DESCRIPTION

[0033] The utility model will be described in further detail below in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0034] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0035] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0037] This embodiment provides a battery top cover that not only reduces the probability of slight deformation and expansion before the thermal film breaks, but also improves the sealing performance of the battery top cover after the thermal film breaks.

[0038] Specifically, such as Figures 1 to 3 As shown, the battery top cover includes a top cover sheet 100, a heat-sensitive element 200, and a waterproof and breathable element 300. The top cover sheet 100 is used to cover the opening of the battery casing and has a first vent 110. The heat-sensitive element 200 includes a heat-sensitive film 210, which seals within the first vent 110. The heat-sensitive film 210 can rupture in high-temperature environments. The waterproof and breathable element 300 includes a substrate 310 and a waterproof and breathable layer. The air section 320 and the substrate 310 are sealed inside the first vent 110, and the substrate 310 is located on the side of the thermal film 210 away from the battery case. The substrate 310 is provided with an exhaust heat dissipation channel 311. One end of the exhaust heat dissipation channel 311 is located on the side of the substrate 310 facing the thermal film 210, and the other end of the exhaust heat dissipation channel 311 is located on the side of the substrate 310 away from the thermal film 210. The waterproof and breathable section 320 is sealed inside the exhaust heat dissipation channel 311.

[0039] In this embodiment, the battery top cover has a thermal film 210 sealing inside the first vent 110 of the top cover sheet 100. The waterproof and breathable element 300 includes a substrate 310 and a waterproof and breathable part 320. The substrate 310 is sealed inside the first vent 110 and is located on the side of the thermal film 210 away from the battery case. The substrate 310 is provided with a venting and heat dissipation channel 311. One end of the venting and heat dissipation channel 311 is located on the side of the substrate 310 facing the thermal film 210, and the other end of the venting and heat dissipation channel 311 is located on the side of the substrate 310 facing the thermal film 210. The substrate 310 is located on the side opposite to the thermal film 210. The waterproof and breathable part 320 is sealed inside the exhaust and heat dissipation channel 311. The waterproof and breathable part 320 has good breathability, thus achieving the effect of ventilation to the inside of the battery case and dissipating the heat inside the battery case to achieve heat dissipation. This reduces the probability of slight deformation and expansion of the thermal film 210 before it breaks, improves the sealing between the thermal film 210 and the top cover 100, and improves the reliability of the exhaust and heat dissipation of the thermal film 210.

[0040] Secondly, even if the thermal film 210 undergoes slight deformation before breaking, thereby reducing the sealing between the thermal film 210 and the top cover 100, the waterproof and breathable part 320 can prevent the leakage of moisture and electrolyte inside the battery case, thus improving the sealing of the battery top cover.

[0041] Thirdly, after the thermal sensitive film 210 is broken, the high pressure gas in the battery shell is sequentially discharged through the first exhaust hole 110, the crack (or exhaust hole) formed by the broken thermal sensitive film 210 and the exhaust heat dissipation channel 311, at this time, the waterproof and breathable part 320 in the exhaust heat dissipation channel 311 can prevent the water and electrolyte in the battery shell from leaking out, thereby improving the sealing performance of the battery top cover.

[0042] It should be noted that the waterproof and breathable part 320 described above is made of a waterproof and breathable material commonly used in the art, for example, an EPTFE (expanded polytetrafluoroethylene) layer, an EPTFE film, a PTFE (polytetrafluoroethylene) layer, a PTFE film or a PU (polyurethane) film, and the like, which will not be listed one by one here.

[0043] Optionally, as shown in Figure 3 and Figure 4 The thermal sensitive element 200 further comprises a sealing ring 220, the hole wall of the first exhaust hole 110 is provided with a first protruding part 111, the first protruding part 111 extends along the circumference of the first exhaust hole 110 and is connected end to end, and the thermal sensitive film 210 presses the sealing ring 220 against the side of the first protruding part 111 away from the battery shell, so as to realize the sealing between the thermal sensitive element 200 and the top cover sheet 100.

[0044] Further, as shown in Figure 3 and Figure 4 The thermal sensitive element 200 further comprises a gasket 230, which is clamped between the thermal sensitive film 210 and the sealing ring 220. Since the thermal sensitive film 210 and the sealing ring 220 are both relatively soft, clamping the gasket 230 between the thermal sensitive film 210 and the sealing ring 220 is conducive to improving the sealing performance of the thermal sensitive film 210 and the sealing ring 220 in compression fit, thereby improving the sealing performance between the thermal sensitive element 200 and the top cover sheet 100.

[0045] In this embodiment, the gasket 230 is a circular aluminum sheet. Aluminum and other metal materials have good thermal conductivity, so they are conducive to transferring heat in the battery shell to the thermal sensitive film 210 and the waterproof and breathable part 320. Of course, in other embodiments, the gasket 230 can also be square or rhombus-shaped or other shapes, and the gasket 230 can also be a copper sheet or other metal sheet, or the gasket 230 can be a ring-shaped structure with slightly poor thermal conductivity, and the central hole is used to spread heat to the thermal sensitive film 210 and the waterproof and breathable part 320.

[0046] It should be noted that the gasket 230 in the embodiment is a circular aluminum sheet. When the thermal sensitive sheet 210 is broken, the temperature in the battery shell is high, and the thermal sensitive sheet 210 will have a large deformation. The large deformation causes a gap to be formed between the thermal sensitive sheet 210 and the gasket 230, between the gasket 230 and the sealing ring 220, and between the sealing ring 220 and the first protruding portion 111. The high-pressure gas in the battery shell can be discharged through the above-mentioned gap. Therefore, the gasket 230 is designed as a sheet structure in the embodiment, and the exhaust effect after the thermal sensitive sheet 210 is broken is not affected.

[0047] Further, as shown in Figure 3 and Figure 4 , the first protruding portion 111 is provided with an annular groove 1111 on the side facing the thermal sensitive sheet 210. The annular groove 1111 is coaxial with the first exhaust hole 110. The sealing ring 220 is tightly embedded in the annular groove 1111 by the thermal sensitive sheet 210, so as to avoid the problem that the sealing ring 220 is cracked due to excessive pressure. The sealing ring 220 provides a strong guarantee for the sealing between the thermal sensitive element 200 and the top cover sheet 100.

[0048] Optionally, as shown in Figures 3 to 5 , the thermal sensitive sheet 210 is provided with a first groove 211 on the side facing the gasket 230. The gasket 230 is embedded in the first groove 211, so as to reduce the thickness of the thermal sensitive element 200, and further reduce the thickness of the battery top cover, which is beneficial to improve the energy density of the battery monomer.

[0049] Optionally, as shown in Figures 3 to 6As shown, the base 310 includes a first base portion 312 and a second base portion 313, the first base portion 312 is provided with the second exhaust hole 3121, the second base portion 313 is connected with the first base portion 312, the second base portion 313 is provided with the third exhaust hole 3131, the third exhaust hole 3131 communicates with the second exhaust hole 3121 and forms the exhaust heat dissipation channel 311, and the waterproof and breathable portion 320 is blocked in the second exhaust hole 3121 and / or the third exhaust hole 3131. In this embodiment, the second exhaust hole 3121 is a variable-diameter hole, the large-diameter end of the second exhaust hole 3121 faces the third exhaust hole 3131, and the waterproof and breathable portion 320 is blocked in the large-diameter end of the second exhaust hole 3121. Of course, in other embodiments, the third exhaust hole 3131 can also be a variable-diameter hole, the large-diameter end of the third exhaust hole 3131 faces the second exhaust hole 3121, and the waterproof and breathable portion 320 is blocked in the large-diameter end of the third exhaust hole 3131. It can also be that the second exhaust hole 3121 and the third exhaust hole 3131 are both variable-diameter holes, part of the waterproof and breathable portion 320 is blocked in the large-diameter end of the second exhaust hole 3121, and the other part of the waterproof and breathable portion 320 is blocked in the large-diameter end of the third exhaust hole 3131. It can be understood that when the diameters of the second exhaust hole 3121 and / or the third exhaust hole 3131 are constant, the waterproof and breathable portion 320 can also be blocked in the second exhaust hole 3121 and / or the third exhaust hole 3131, which will not be described here.

[0050] In this embodiment, the first base portion 312 can be aluminum, stainless steel or high-temperature-resistant plastic material, and the second base portion 313 is a high-temperature-resistant fixed adhesive layer, which is bonded to the first base portion 312 to achieve fixed connection of the second base portion 313 and the first base portion 312. Of course, in other embodiments, the second base portion 313 can also be aluminum, stainless steel or high-temperature-resistant plastic material, and the second base portion 313 is fixedly connected with the first base portion 312 by welding or riveting.

[0051] Further, as shown in the drawings, Figures 3 to 6 The edge of the first exhaust hole 110 is provided with a fourth protruding portion 114, the fourth protruding portion 114 extends along the circumference of the first exhaust hole 110 and is connected end to end, and the fourth protruding portion 114 is located on the side of the top cover sheet 100 away from the battery shell. Along the circumference of the first exhaust hole 110, the first base portion 312 is sealed and welded with the fourth protruding portion 114 to achieve sealing between the waterproof and breathable element 300 and the top cover sheet 100. Compared with other sealing forms, the weld formed by the sealed welding has good sealing performance, which provides a strong guarantee for the sealing performance of the waterproof and breathable element 300 and the top cover sheet 100.

[0052] Optionally, as shown in the drawings, Figures 3 to 6As shown, the hole wall of the first vent hole 110 is further provided with a second protruding part 112, the second protruding part 112 extends along the circumference of the first vent hole 110 and is connected head to tail, the edge of the first base part 312 is pressed on the side of the second protruding part 112 away from the battery shell, further improving the stability of the connection between the waterproof and breathable element 300 and the top cover sheet 100.

[0053] Optionally, as shown in the drawings, Figures 3 to 6 As shown, the first base part 312 is further provided with a second groove 3122, the second vent hole 3121 is opened at the groove bottom of the second groove 3122, the second base part 313 is arranged in the second groove 3122, the hole wall of the first vent hole 110 is further provided with a third protruding part 113, the third protruding part 113 extends along the circumference of the first vent hole 110 and is connected head to tail, the third protruding part 113 is located between the first protruding part 111 and the second protruding part 112, the edge of the heat-sensitive film 210 is clamped between the edge of the second groove 3122 and the third protruding part 113, thereby realizing the connection between the waterproof and breathable element 300 and the heat-sensitive element 200, making the overall structure of the battery top cover more compact, which is conducive to improving the energy density of the battery monomer. Moreover, the second base part 313 arranged in the second groove 3122 can reduce the thickness of the waterproof and breathable element 300, which has the effect of further improving the energy density of the battery monomer.

[0054] Further, as shown in the drawings, Figures 3 to 6 The edge of the heat-sensitive film 210 away from the battery shell is flush with the side of the second protruding part 112 away from the battery shell, and further makes the surface of the first base part 312 pressed on the second protruding part 112 flush with the surface of the edge of the second groove 3122, simplifying the structure of the first base part 312 and reducing the thickness of the first base part 312.

[0055] Optionally, as shown in the drawings, Figures 3 to 6 The first protruding part 111, the third protruding part 113 and the second protruding part 112 are connected in turn to further improve the compactness of the battery top cover structure.

[0056] Optionally, as shown in the drawings, Figures 3 to 6 The edge of the gasket 230 is pressed on the side of the third protruding part 113 towards the heat-sensitive film 210, making the connection between the gasket 230 and the top cover sheet 100 more stable, and further improving the sealing performance of the heat-sensitive film 210 and the sealing ring 220.

[0057] Optionally, as shown in the drawings, Figures 3 to 6As shown, the thermal sensitive film 210 is provided with a boss 212 on the side facing the second base part 313, and the boss 212 is located in the second groove 3122, so that when the thermal sensitive element 200 and the waterproof and breathable element 300 are assembled, the second groove 3122 is aligned with the boss 212 and the base 310 is assembled into the first exhaust hole 110, and it can be seen that the structure design is beneficial to simplify the assembly of the thermal sensitive element 200 and the waterproof and breathable element 300, and has the effect of improving the assembly efficiency. Moreover, the structure design can also reduce the thickness of the battery top cover, and is beneficial to improve the energy density of the battery monomer.

[0058] Optionally, as shown, Figures 3 to 6 The battery top cover further comprises a plastic part 400, which covers the surface of the top cover sheet 100 on the side facing the battery shell, so as to realize the insulation of the top cover sheet 100 and the battery shell.

[0059] The embodiment also provides a battery monomer, which comprises a battery cell, a battery shell and the above-mentioned battery top cover, the battery cell is arranged in the battery shell, and the top cover sheet 100 covers the opening of the battery shell, when the temperature in the battery shell slightly increases, the heat in the battery shell can be discharged through the first exhaust hole 110, the thermal sensitive film 210, the exhaust heat dissipation channel 311 and the waterproof and breathable part 320 in the exhaust heat dissipation channel 311, the probability of slight deformation and expansion of the thermal sensitive film 210 before the thermal sensitive film 210 breaks is reduced, the sealing between the thermal sensitive film 210 and the top cover sheet 100 is improved, and the reliability of the exhaust heat dissipation of the thermal sensitive film 210 is improved; in addition, when the thermal sensitive film 210 slightly deforms before the thermal sensitive film 210 breaks, and after the thermal sensitive film 210 breaks, the waterproof and breathable part 320 can prevent the water and electrolyte in the battery shell from leaking out, so that the sealing effect of the battery top cover is improved, and it can be seen that the battery monomer adopting the above-mentioned battery top cover has high use safety.

[0060] Obviously, the above-mentioned embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be carried out without departing from the protection scope of the utility model. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery top cover characterized by, The application relates to a battery cover plate, which comprises a top cover sheet (100) used for covering an opening of a battery shell, wherein the top cover sheet (100) is provided with a first exhaust hole (110); a heat-sensitive element (200) comprising a heat-sensitive film (210) which is sealed in the first exhaust hole (110) and can be broken in a high-temperature environment; and a waterproof and breathable element (300) comprising a base body (310) and a waterproof and breathable part (320), wherein the base body (310) is sealed in the first exhaust hole (110) and is located on a side of the heat-sensitive film (210) away from the battery shell, the base body (310) is provided with an exhaust heat dissipation channel (311) with one end located on a side of the base body (310) facing the heat-sensitive film (210) and the other end located on a side of the base body (310) away from the heat-sensitive film (210), and the waterproof and breathable part (320) is sealed in the exhaust heat dissipation channel (311). The heat-sensitive element (200) further comprises a sealing ring (220), a first protruding part (111) is arranged on a hole wall of the first exhaust hole (110) and extends along the circumference of the first exhaust hole (110) and is connected end to end, and the heat-sensitive film (210) presses the sealing ring (220) against a side of the first protruding part (111) away from the battery shell. The heat-sensitive element (200) further comprises a gasket (230) clamped between the heat-sensitive film (210) and the sealing ring (220). A side of the heat-sensitive film (210) facing the gasket (230) is provided with a first groove (211) in which the gasket (230) is embedded.

2. The battery header of claim 1, wherein, A side of the first protruding part (111) facing the heat-sensitive film (210) is provided with an annular groove (1111) coaxial with the first exhaust hole (110), and the sealing ring (220) is pressed and embedded in the annular groove (1111) by the heat-sensitive film (210).

3. The battery cup of claim 2, wherein: The base body (310) comprises a first base body part (312) provided with a second exhaust hole (3121) and a second base body part (313) connected with the first base body part (312) and provided with a third exhaust hole (3131) in communication with the second exhaust hole (3121) and forming the exhaust heat dissipation channel (311).

4. The battery header of claim 3, wherein, ​ 5. The battery cover of claim 2, wherein, ​ 6. The battery cover of any one of claims 1-5, wherein the cover is made of a material selected from the group consisting of: aluminum, steel, and a combination thereof. ​ 7. The battery header of claim 6, wherein, The hole wall of the first exhaust hole (110) is further provided with a second protruding part (112), the second protruding part (112) extends along the circumference of the first exhaust hole (110) and is connected head to tail, and the edge of the first base part (312) is pressed on the side of the second protruding part (112) away from the battery case.

8. The battery header of claim 7, wherein, The first base part (312) is further provided with a second groove (3122), the second exhaust hole (3121) is arranged on the groove bottom of the second groove (3122), the second base part (313) is arranged in the second groove (3122), the hole wall of the first exhaust hole (110) is further provided with a third protruding part (113), the third protruding part (113) extends along the circumference of the first exhaust hole (110) and is connected head to tail, the third protruding part (113) is located between the first protruding part (111) and the second protruding part (112), and the edge of the thermal sensitive film (210) is clamped between the edge of the second groove (3122) and the third protruding part (113).

9. The battery cup of claim 6, wherein: The edge of the first exhaust hole (110) is provided with a fourth protruding part (114), the fourth protruding part (114) extends along the circumference of the first exhaust hole (110) and is connected head to tail, the fourth protruding part (114) is located on the side of the top cover sheet (100) away from the battery case, along the circumference of the first exhaust hole (110), and the first base part (312) is sealedly welded with the fourth protruding part (114).

10. A battery cell, characterized by The battery top cover comprises a cell, a battery case and the battery top cover according to any one of claims 1-9, the cell is arranged in the battery case, and the top cover sheet (100) is arranged on the opening of the battery case.

Images