Battery top cover structure and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover structure and a battery. The battery top cover structure is connected with a battery shell and comprises a top cover body, a gas collecting cover and a first one-way valve, the gas collecting cover is positioned outside the battery shell, is arranged on the top cover body and is provided with a gas collecting cavity; the first one-way valve comprises a valve body and a valve element. The valve body is located in the battery shell and connected to the top cover body. The valve body is provided with a first communication port, a cavity and a second communication port which are communicated in sequence, the first communication port is communicated with the interior of the battery shell, the second communication port is communicated with the gas collection cavity, and the valve element is arranged in the cavity and used for opening or closing the first communication port. The battery top cover structure is simple in structure, small in occupied space and high in safety performance.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery top cover structure and a battery. Background Art

[0002] With the popularity of batteries, their safety performance has been increasingly valued by users and R&D personnel. During storage and circulation, the internal gas generation of the battery cell becomes increasingly serious over time, which has an increasing impact on the performance of the battery cell and the risk of explosion safety. When the adjacent battery cell fails due to explosion, the gas temperature inside the battery rises, and the high-temperature and high-pressure gas causes the battery cell to explode, which in turn causes the explosion of the entire module and the destruction of other components.

[0003] In the prior art, in order to prevent accidents such as explosions caused by thermal runaway of the battery cell, an explosion-proof valve is usually provided on the top cover of the battery. When the pressure inside the battery shell reaches the preset conditions, the high-temperature and high-pressure gas will break through the explosion-proof valve and escape to the outside of the battery shell. In addition, by providing a gas collector on the outside of the battery, the gas collector includes a one-way valve, an air duct and an air collecting bag, and the air duct is connected to the inside of the battery, and the gas generated by the battery cell is directly transported to the air collecting bag to avoid the harm caused by the failure of the battery cell, and at the same time, the cycle life of the battery cell is extended as much as possible. However, this type of solution has too many external components, and the shapes of the components are irregular, which seriously affects the assembly of the battery module and makes the unusable space inside the battery module too large. And when the battery cell fails due to short circuit or impact, the components such as the conduit and the one-way valve are more likely to be ignited by the high-temperature gas, causing the air bag to explode, causing the failure and explosion of the entire battery module, thereby causing greater safety problems.

[0004] Therefore, it is urgent to propose a battery top cover structure and a battery to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a battery top cover structure, which has a simple structure, occupies a small space and has high safety performance.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A battery top cover structure is connected to a battery housing, and the battery top cover structure comprises:

[0008] Top cover body;

[0009] A gas collecting cover, the gas collecting cover is located outside the battery housing and is arranged on the top cover body, and the gas collecting cover has a gas collecting cavity;

[0010] A first one-way valve, the first one-way valve includes a valve body and a valve core, the valve body is located inside the battery shell and connected to the top cover body, the valve body has a first communication port, a cavity and a second communication port that are connected in sequence, the first communication port is connected to the interior of the battery shell, the second communication port is connected to the gas collecting cavity, the valve core is arranged in the cavity, and the valve core is used to open or close the first communication port.

[0011] Optionally, the valve core is a spring, the spring extends along the air inlet and outlet directions of the valve body, one end of the spring close to the second communication port is connected to the valve body, and one end of the spring close to the first communication port is connected to a blocking portion;

[0012] When the internal pressure of the battery housing is greater than a preset pressure, the spring is compressed and drives the blocking portion away from the first communication port;

[0013] When the internal pressure of the battery housing is less than a preset pressure, the spring rebounds and pushes the blocking portion to block the first communication port.

[0014] Optionally, the valve core is a film, a valve stem is fixedly arranged in the valve body, the valve stem extends along the air inlet and outlet directions of the valve body, and the film is arranged at one end of the valve stem close to the first communication port;

[0015] When the internal pressure of the battery housing is greater than a preset pressure, the film is compressed to open the first communication port;

[0016] When the internal pressure of the battery housing is less than a preset pressure, the film rebounds to block the first communication port.

[0017] Optionally, a positive pole and a negative pole are provided on the top cover body, the gas collecting cover is located between the positive pole and the negative pole, and the height of the gas collecting cover is not higher than the height of the positive pole and the negative pole.

[0018] Optionally, a second one-way valve is provided on the gas collecting cover, and when the second one-way valve is opened, the gas in the gas collecting cavity can escape to the outside of the battery housing.

[0019] Optionally, a pressure indicating element is provided on the gas collecting cover, and the pressure indicating element is used to indicate the pressure in the gas collecting cavity.

[0020] Optionally, the valve body is provided with a connecting portion at the second communicating port, the connecting portion has a connecting channel inside, the second communicating port is connected with the gas collecting chamber through the connecting channel, the connecting portion is arranged through the top cover body, and the outer wall of the connecting portion is connected to the bottom of the gas collecting cover.

[0021] Optionally, a slot is provided at the bottom of the gas collecting cover, the slot is communicated with the gas collecting cavity, and the connecting part is inserted into the slot.

[0022] Optionally, a latching tooth is disposed on the outer side of the connecting portion, a latching groove is disposed on the inner side of the slot, and the latching tooth and the latching groove are latched.

[0023] The utility model aims to provide a battery with a simple structure, small occupied space and high safety performance.

[0024] To achieve this purpose, the utility model adopts the following technical solutions:

[0025] A battery comprises a battery casing, a battery cell and the battery top cover structure, wherein the battery cell is arranged in the battery casing, and the top cover body is connected to the battery casing.

[0026] Beneficial effects:

[0027] The battery top cover structure provided by the utility model realizes the collection of gas inside the battery by respectively arranging a gas collecting cover and a first one-way valve on both sides of the top cover body. A valve core is arranged in the valve body of the first one-way valve. Under normal circumstances, the valve core closes the first connecting port. When the gas pressure inside the battery is too high, the gas pushes open the valve core, and the first connecting port is connected to the cavity, so that the gas inside the battery shell enters the gas collecting cavity through the first connecting port, the cavity and the second connecting port in turn, so as to realize the collection of gas. The gas collecting cover is directly connected to the top cover. Compared with the arrangement of the air duct and the gas collecting bag in the prior art, the structure is simpler, the assembly difficulty is reduced, and the space occupied is smaller. Collecting the gas inside the battery in the gas collecting cover prolongs the cycle and performance of the battery cell to a certain extent. Moreover, when a single battery cell is short-circuited or fails due to impact and extrusion, since most of the gas is stored in the gas collecting cover, the possibility of explosion or fire of the battery module can be effectively reduced.

[0028] The battery provided by the utility model includes the above-mentioned battery top cover structure. Under normal circumstances, the first one-way valve is in a closed state, but when the gas pressure inside the battery is too high, the valve core in the first one-way valve opens the first connecting port, and the gas enters the gas collecting cavity through the first connecting port, the cavity and the second connecting port of the first one-way valve in sequence. After the gas enters the gas collecting cavity, the gas pressure inside the battery decreases, and the valve core rebounds to block the first connecting port. The gas collecting cover plays the role of storing gas and relieving the internal pressure of the battery, thereby reducing the possibility of the battery being dangerous due to excessive internal pressure and high temperature, thereby extending the cycle life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0030] Figure 1 It is a schematic diagram of the battery cover structure provided by the first embodiment of the utility model;

[0031] Figure 2 This is a partial structural diagram of the battery cover structure provided in the first embodiment of the utility model. Figure 1 ;

[0032] Figure 3 This is a partial structural diagram of the battery cover structure provided in the first embodiment of the utility model. Figure 2 ;

[0033] Figure 4 This is a schematic diagram of the structure of the gas collecting cover provided in the first embodiment of the utility model;

[0034] Figure 5 This is a schematic diagram of the structure of the first one-way valve provided in the second embodiment of the present utility model. Figure 1 ;

[0035] Figure 6 This is a schematic diagram of the structure of the first one-way valve provided in the second embodiment of the present utility model. Figure 2 ;

[0036] Figure 7 This is a schematic diagram of the structure of the first one-way valve provided in the second embodiment of the present utility model. Figure 3 .

[0037] In the figure:

[0038] 100, top cover body;

[0039] 200, gas collecting cover; 210, second one-way valve; 220, pressure indicating element; 230, slot; 231, card slot;

[0040] 300, first one-way valve; 310, valve body; 3101, first communication port; 3102, cavity; 3103, second communication port; 311, connecting portion; 3111, latching tooth; 321, spring; 322, film; 331, blocking portion; 332, valve stem. DETAILED DESCRIPTION

[0041] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] Embodiment 1

[0046] See also Figure 1 and Figure 2, this embodiment provides a battery top cover structure. The battery top cover structure is connected to the battery shell, and includes: a top cover body 100, a gas collecting cover 200 and a first one-way valve 300. The gas collecting cover 200 is located outside the battery shell and is arranged on the top cover body 100, and the gas collecting cover 200 has a gas collecting cavity. The first one-way valve 300 includes a valve body 310 and a valve core. The valve body 310 is located inside the battery shell and connected to the top cover body 100. The valve body 310 has a first connecting port 3101, a cavity 3102 and a second connecting port 3103 that are connected in sequence. The first connecting port 3101 is connected to the interior of the battery shell, and the second connecting port 3103 is connected to the gas collecting cavity. The valve core is arranged in the cavity 3102, and the valve core is used to open or close the first connecting port 3101.

[0047] The battery top cover structure collects gas inside the battery by respectively setting a gas collecting cover 200 and a first one-way valve 300 on both sides of the top cover body 100. A valve core is set in the valve body 310 of the first one-way valve 300. Under normal circumstances, the valve core closes the first connecting port 3101. When the gas pressure inside the battery is too high, the gas pushes the valve core open, and the first connecting port 3101 is connected to the cavity 3102, so that the gas inside the battery shell enters the gas collecting cavity through the first connecting port 3101, the cavity 3102 and the second connecting port 3103 in turn, so as to collect gas. The gas collecting cover 200 is directly connected to the top cover body 100. Compared with the arrangement of the air guide tube and the gas collecting bag in the prior art, the structure is simpler, the assembly difficulty is reduced, and the space occupied is smaller; the first one-way valve 300 is directly connected to the top cover body 100 and is located inside the battery, which can make full use of the space between the top cover body 100 and the battery cell to avoid space waste. Collecting the internal gas of the battery in the gas collecting cap 200 prolongs the cycle and performance of the battery cell to a certain extent. In addition, when a single battery cell short-circuits or fails due to impact or compression, since most of the gas is stored in the gas collecting cap 200, the possibility of battery explosion or fire can be effectively reduced.

[0048] Further, see Figure 1 A positive electrode column and a negative electrode column are arranged on the top cover body 100, and the gas collecting cover 200 is located between the positive electrode column and the negative electrode column. The height of the gas collecting cover 200 is not higher than the height of the positive electrode column and the negative electrode column.

[0049] In the present embodiment, the gas collecting cover 200 is centrally arranged on the top cover body 100, and the positive pole and the negative pole are respectively located on both sides of the gas collecting cover 200. The height of the gas collecting cover 200 is not higher than the pole height, which can avoid affecting the assembly of the battery module or battery pack, and can make full use of the height space from the end face of the positive and negative poles to the surface of the top cover body 100. Optionally, the width of the gas collecting cover 200 is not greater than the thickness of the battery cell. Since the high-temperature and high-pressure gas is stored in the gas collecting cover 200, the gas collecting cover 200 is preferably made of insulating, high-temperature and high-pressure resistant, corrosion-resistant, and impact-resistant materials, such as polyester resin, polycarbonate, polyformaldehyde and other resin materials. Furthermore, a fire-retardant coating, such as an inorganic nano fire-retardant coating, is provided on the surface of the gas collecting cover 200. In the present embodiment, the pressure resistance of the gas collecting cover 200 is 25Mpa. Its own high-temperature resistance and fire-retardant coating can enable it to store gas stably at high temperatures, ensuring that there will be no explosion and failure of the battery cell due to gas production.

[0050] Further, see Figure 1 A second one-way valve 210 is disposed on the gas collecting cover 200. When the second one-way valve 210 is opened, the gas in the gas collecting cavity can escape to the outside of the battery housing.

[0051] Optionally, the second one-way valve 210 is a thin-film resin one-way valve. When the pressure in the gas collecting chamber is too high, the film opens and the gas overflows; when the pressure in the gas collecting chamber is low, the film rebounds and blocks the outlet. By setting the second one-way valve 210, the gas inside the gas collecting chamber can be discharged to avoid excessive pressure in the gas collecting chamber.

[0052] Optionally, a pressure indicating element 220 is provided on the gas collecting cover 200 , and the pressure indicating element 220 is used to indicate the pressure in the gas collecting cavity.

[0053] The pressure indicating element 220 may be made of a pressure sensitive material. The pressure sensitive material is sealed in a transparent soft package. When the pressure inside the gas collecting chamber reaches the release limit, the pressure sensitive material changes color or changes color. By observing the pressure indicating element 220, the gas collecting cover 200 can be replaced in time to avoid excessive pressure on the gas collecting cover 200.

[0054] Further, see Figure 1 and Figure 2 The first one-way valve 300 is centrally arranged on the top cover body 100, that is, it is arranged opposite to the gas collecting cover 200. The material of the valve body 310 can be the same as or different from that of the gas collecting cover 200, and can be selected according to the use requirements.

[0055] Further, see Figure 2The valve core is a spring 321, which extends along the air inlet and outlet direction of the valve body 310. One end of the spring 321 close to the second communication port 3103 is connected to the valve body 310, and a section close to the first communication port 3101 is connected to the blocking portion 331. When the internal pressure of the battery shell is greater than the preset pressure, the spring 321 compresses and drives the blocking portion 331 away from the first communication port 3101; when the internal pressure of the battery shell is less than the preset pressure, the spring 321 rebounds and pushes the blocking portion 331 to block the first communication port 3101.

[0056] It can be understood that the preset pressure is set according to the specific use needs to avoid the risk of explosion caused by excessive pressure inside the battery shell. For example, the preset pressure value can be 0.5MPa-1.0Mpa, for example: 0.5Mpa, 0.6Mpa, 0.7Mpa, 0.8Mpa, 0.9Mpa, 1.0Mpa, which can be adjusted according to actual needs. When the internal pressure of the battery shell is greater than the preset pressure, the gas pushes the blocking portion 331 upward, and at the same time, the spring 321 contracts, so that the first connecting port 3101 opens. The gas enters the gas collecting cavity through the first connecting port 3101, the cavity 3102 and the second connecting port 3103 in turn for storage to relieve the pressure caused by the gas on the battery shell. When the internal pressure of the battery shell is less than the preset pressure, the blocking portion 331 is pressed at the first connecting port 3101 under the action of the elastic force of the spring 321 to block the first connecting port 3101.

[0057] Further, see Figures 1 to 3 The valve body 310 is provided with a connecting portion 311 at the second communicating port 3103. The interior of the connecting portion 311 has a communicating channel. The second communicating port 3103 is connected to the gas collecting chamber through the communicating channel. The connecting portion 311 is provided through the top cover body 100, and the outer wall of the connecting portion 311 is connected to the bottom of the gas collecting cover 200.

[0058] Optionally, the connection part 311 and the valve body 310 are integrally formed. The connection part 311 is generally columnar, and the cover body is provided with an escape opening for allowing the connection part 311 to pass through. Optionally, the material of the connection part 311 can be selected according to actual needs and costs, including but not limited to 316L steel, SUS304, copper, aluminum, and various metal or resin materials.

[0059] Furthermore, a slot 230 is provided at the bottom of the gas collecting cover 200 , the slot 230 is communicated with the gas collecting cavity, and the connecting portion 311 is inserted into the slot 230 .

[0060] In this embodiment, the gas collecting cover 200 and the slot 230 are connected by plugging, which is easy to operate, has a simple structure, and is convenient for disassembly and reassembly.

[0061] Further, see Figure 3 and Figure 4 A latching tooth 3111 is disposed on the outer side of the connecting portion 311 , and a latching groove 231 is disposed on the inner side of the slot 230 , and the latching tooth 3111 and the latching groove 231 are latched.

[0062] The provision of the latching teeth 3111 and the latching grooves 231 can effectively prevent the gas collecting cover 200 and the connecting portion 311 from falling off.

[0063] In another embodiment, the connection portion 311 and the gas collecting cover 200 are threadedly connected.

[0064] Optionally, an external thread may be provided on the outer side of the connection portion 311 and an internal thread may be provided on the bottom of the gas collecting bottle, so as to achieve a threaded connection between the connection portion 311 and the gas collecting bottle.

[0065] The working principle of the battery top cover structure provided in this embodiment is:

[0066] When the preset pressure is reached inside the battery, the valve core is lifted, and the gas enters the gas collecting cavity through the first communication port 3101, the cavity 3102, the second communication port 3103, and the connecting channel in the connecting portion 311 inside the first one-way valve 300 in sequence. After the gas enters the gas collecting cap 200, the pressure inside the battery decreases, and the valve core returns to its original position to block the first communication port 3101. When the pressure element inside the gas collecting cap 200 changes color, the gas collecting cap 200 is removed from the connecting portion 311, and a new gas collecting cap 200 is pressed and connected. The old gas collecting cap 200 is recycled to facilitate timely analysis of the gas composition and content inside the battery.

[0067] Furthermore, this embodiment also provides a battery, including a battery casing, a battery cell and the above-mentioned battery top cover structure, the battery cell is arranged in the battery casing, and the top cover body 100 is connected to the battery casing.

[0068] Under normal circumstances, the first one-way valve 300 of the battery is in a closed state. However, when the gas pressure inside the battery is too high, the valve core in the first one-way valve 300 opens the first communication port 3101, and the gas enters the gas collecting cavity through the first communication port 3101, the cavity 3102, and the second communication port 3103 of the first one-way valve 300 in sequence. After the gas enters the gas collecting cavity, the gas pressure inside the battery decreases, and the valve core rebounds to block the first communication port 3101. The gas collecting cap 200 has the function of storing gas and relieving the internal pressure of the battery, thereby reducing the possibility of the battery being dangerous due to excessive internal pressure and high temperature, thereby extending the cycle life of the battery.

[0069] Embodiment 2

[0070] The similarities between this embodiment and the first embodiment are not described again, and only the differences between this embodiment and the first embodiment are described below:

[0071] See also Figures 5 to 7In this embodiment, the first one-way valve 300 includes a valve body 310 and a valve core, wherein the valve core is a film 322, a valve stem 332 is fixedly arranged in the valve body 310, the valve stem 332 extends along the air inlet and outlet directions of the valve body 310, and the film 322 is arranged at one end of the valve stem 332 close to the first communication port 3101;

[0072] When the internal pressure of the battery housing is greater than the preset pressure, the film 322 is compressed to open the first communication port 3101;

[0073] When the internal pressure of the battery housing is lower than the preset pressure, the film 322 rebounds to block the first communication port 3101 .

[0074] Figures 5 to 7 These are the three states of the valve body 310: fully open, half open, and closed.

[0075] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery top cover structure connected to a battery housing, characterized in that: The battery top cover structure comprises: Top cover body (100); A gas collecting cover (200), the gas collecting cover (200) is located outside the battery housing and is arranged on the top cover body (100), and the gas collecting cover (200) has a gas collecting cavity; A first one-way valve (300), the first one-way valve (300) includes a valve body (310) and a valve core, the valve body (310) is located inside the battery shell and connected to the top cover body (100), the valve body (310) has a first connecting port (3101), a cavity (3102) and a second connecting port (3103) which are connected in sequence, the first connecting port (3101) is connected to the interior of the battery shell, the second connecting port (3103) is connected to the gas collecting cavity, the valve core is arranged in the cavity (3102), and the valve core is used to open or close the first connecting port (3101).

2. The battery top cover structure according to claim 1, characterized in that: The valve core is a spring (321), and the spring (321) extends along the air inlet and outlet directions of the valve body (310). One end of the spring (321) close to the second communication port (3103) is connected to the valve body (310), and one end of the spring (321) close to the first communication port (3101) is connected to a blocking portion (331); When the internal pressure of the battery housing is greater than a preset pressure, the spring (321) is compressed and drives the blocking portion (331) away from the first communication port (3101); When the internal pressure of the battery housing is lower than a preset pressure, the spring (321) rebounds and pushes the blocking portion (331) to block the first communication port (3101).

3. The battery top cover structure according to claim 1, characterized in that: The valve core is a film (322), a valve stem (332) is fixedly arranged in the valve body (310), the valve stem (332) extends along the air inlet and outlet directions of the valve body (310), and the film (322) is arranged at one end of the valve stem (332) close to the first communication port (3101); When the internal pressure of the battery housing is greater than a preset pressure, the film (322) is compressed to open the first communication port (3101); When the internal pressure of the battery housing is lower than a preset pressure, the film (322) rebounds to block the first communication port (3101).

4. The battery top cover structure according to claim 1, characterized in that: The top cover body (100) is provided with a positive pole column and a negative pole column, the gas collecting cover (200) is located between the positive pole column and the negative pole column, and the height of the gas collecting cover (200) is not higher than the height of the positive pole column and the negative pole column.

5. The battery top cover structure according to claim 1, characterized in that: The gas collecting cover (200) is provided with a second one-way valve (210), and when the second one-way valve (210) is opened, the gas in the gas collecting cavity can escape to the outside of the battery housing.

6. The battery top cover structure according to claim 1, characterized in that: The gas collecting cover (200) is provided with a pressure indicating element (220), and the pressure indicating element (220) is used to indicate the pressure in the gas collecting cavity.

7. The battery top cover structure according to any one of claims 1 to 6, characterized in that: The valve body (310) is provided with a connecting portion (311) at the second communicating port (3103), and the connecting portion (311) has a connecting passage inside. The second communicating port (3103) is connected to the gas collecting chamber through the connecting passage. The connecting portion (311) is provided through the top cover body (100), and the outer wall of the connecting portion (311) is connected to the bottom of the gas collecting cover (200).

8. The battery top cover structure according to claim 7, characterized in that: A slot (230) is provided at the bottom of the gas collecting cover (200), the slot (230) is communicated with the gas collecting cavity, and the connecting portion (311) is inserted into the slot (230).

9. The battery top cover structure according to claim 8, characterized in that: The outer side of the connecting portion (311) is provided with a latching tooth (3111), the inner side of the slot (230) is provided with a latching groove (231), and the latching tooth (3111) and the latching groove (231) are latched.

10. A battery, characterized in that It comprises a battery casing, a battery cell and a battery top cover structure as claimed in any one of claims 1 to 9, wherein the battery cell is arranged in the battery casing, and the top cover body (100) is connected to the battery casing.

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