Battery monomer, battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery monomer, a battery and electric equipment. The battery monomer comprises a shell, wherein an anti-explosion valve is arranged at one end of the shell in a first direction; the battery cell is arranged in the shell, and the tab-free end of the battery cell corresponds to the anti-explosion valve; the flexible breathable gasket is arranged in the shell and is positioned between the tab-free end of the battery cell and the anti-explosion valve; the flexible breathable gasket comprises a first breathable layer and a second breathable layer which are sequentially arranged in the first direction. Wherein the first breathable layer is in contact with the tab-free end, and the second breathable layer is arranged on the side, facing the anti-explosion valve, of the first breathable layer and covers the anti-explosion valve. According to the explosion-proof valve disclosed by the utility model, the flexible breathable gasket plays a role in buffering, supporting and ventilating the battery cell, prevents the diaphragm from being extruded and deformed, can enable gas to pass through to quickly release air pressure when the explosion-proof valve is opened, is better in breathable uniformity, is favorable for enhancing the stability of airflow, prevents larger airflow fluctuation in a local area, and improves the safety of the explosion-proof valve. And meanwhile, the safety of the battery is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery cell, a battery and an electrical device. Background Art

[0002] With the rapid development of battery technology, battery products with high energy density and high safety (such as large cylindrical cells) have gradually gained favor in the industry. At present, the prior art provides a cell with a same-side pole ear design, which can further reduce the internal resistance of the cell structure. This design requires the explosion-proof valve and gasket to be set at the non-polar ear end of the cell to form an assembly form of cell-gasket-explosion-proof valve. However, the explosion-proof valve is based on the internal air pressure as the basis for opening the valve. The results of the cell safety test show that the gasket has a barrier effect on the flow of gas, resulting in large pressure fluctuations when the explosion-proof valve is opened, and the safety and stability of the cell are reduced. The existing countermeasures usually adopt the method of opening air holes on the hard gasket, but because the outer surface of the cell is covered with a diaphragm when the cell is assembled, the diaphragm at the non-polar ear end will exceed the cell, which is easily squeezed and deformed by the gasket, and will also affect the normal flow of gas. At the same time, it will destroy the integrity of the cell and affect the quality of the battery product. Utility Model Content

[0003] In view of this, in order to improve at least one of the above problems existing in the prior art, the utility model provides a battery cell, a battery and an electrical device.

[0004] The first technical solution of the utility model provides a battery cell, including: a shell, an explosion-proof valve is provided at one end of the shell in a first direction; a battery cell is arranged in the shell, and the non-polar ear end of the battery cell is arranged corresponding to the explosion-proof valve; a flexible breathable gasket is arranged in the shell and located between the non-polar ear end of the battery cell and the explosion-proof valve; the flexible breathable gasket includes a first breathable layer and a second breathable layer arranged in sequence in the first direction; wherein the first breathable layer is in contact with the non-polar ear end, and the second breathable layer is arranged on the side of the first breathable layer facing the explosion-proof valve, and covers the explosion-proof valve.

[0005] In a feasible implementation, the air permeability of the first air permeable layer is 0.5 s / ml to 1.5 s / ml; the air permeability of the second air permeable layer is 0.2 s / ml to 2 s / ml.

[0006] In a feasible implementation, the second breathable layer is an elastic breathable layer; the first breathable layer is a breathable membrane layer, and the first breathable layer is fixedly connected to the second breathable layer.

[0007] In a feasible implementation, the thickness of the first air-permeable layer in the first direction is 0.1 mm to 0.5 mm; the thickness of the second air-permeable layer in the first direction is 0.2 mm to 1 mm.

[0008] In a feasible implementation, the flexible breathable gasket also includes: a buffer layer, the buffer layer is arranged on the side of the second breathable layer away from the first breathable layer, and is fixedly connected to the second breathable layer, and the side of the buffer layer away from the second breathable layer abuts against the inner wall surface of the shell; wherein a first opening is provided on the buffer layer at a position opposite to the explosion-proof valve, and the first opening passes through in a first direction.

[0009] In a feasible implementation, the buffer layer is a silica gel layer; and / or

[0010] The thickness of the buffer layer in the first direction is 0.2 mm to 0.5 mm.

[0011] In a feasible implementation, the buffer layer is a continuous structure extending around the circumference of the first opening; or

[0012] The buffer layer includes a plurality of buffer blocks, and the plurality of buffer blocks are arranged at intervals along the circumferential direction of the first opening.

[0013] In a feasible implementation, a boss structure is provided on a side of the second air-permeable layer facing the buffer layer, and the boss structure penetrates into the first opening.

[0014] The technical solution of the second aspect of the present invention provides a battery, comprising: a battery cell as described in any one of the above-mentioned first aspect.

[0015] The technical solution of the third aspect of the utility model provides an electrical device, comprising the battery in any one of the above-mentioned second aspects.

[0016] The beneficial effects of the above technical solution of the utility model are embodied in:

[0017] A flexible breathable gasket is set between the battery cell and the explosion-proof valve, which can not only buffer and support the battery cell, prevent the battery cell's diaphragm from being squeezed and deformed, and is beneficial to improving the protective effect of the diaphragm and the battery cell, but also has good air permeability, which can allow gas to pass through the flexible breathable gasket when the explosion-proof valve is opened to quickly release air pressure and reduce safety hazards. Moreover, different positions on the flexible breathable gasket are breathable, which can allow airflow to pass through evenly, which is beneficial to enhancing the stability of the gas flow process and preventing large airflow fluctuations in local areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic diagram of the internal structure of a battery cell provided by an embodiment of the utility model.

[0019] Figure 2 Shown is a schematic diagram of a flexible breathable gasket provided by an embodiment of the utility model.

[0020] Figure 3Shown is a schematic diagram of the internal structure of another battery cell provided by an embodiment of the utility model.

[0021] Figure 4 Shown is a cross-sectional view of another flexible breathable gasket provided by an embodiment of the utility model.

[0022] Figure 5 Shown is a top view of a buffer layer provided by an embodiment of the utility model.

[0023] Figure 6 Shown is a top view of another buffer layer provided by an embodiment of the utility model.

[0024] Figure 7 Shown is a cross-sectional view of another flexible breathable gasket provided by an embodiment of the utility model.

[0025] Figure 8 Shown is a top view of another buffer layer provided by an embodiment of the utility model.

[0026] Fig. 9 Shown is a top view of another buffer layer provided by an embodiment of the utility model.

[0027] Fig.10 Shown is a cross-sectional view of another flexible breathable gasket provided by an embodiment of the utility model.

[0028] Fig.11 Shown is a schematic block diagram of a battery provided by an embodiment of the utility model.

[0029] Fig.12 The figure shows a schematic block diagram of an electric device provided by an embodiment of the utility model.

[0030] Description of reference numerals:

[0031] 100 battery cells;

[0032] 1 shell, 11 explosion-proof valve;

[0033] 2 battery cell, 21 electrodeless ear end, 22 diaphragm;

[0034] 3 flexible breathable gasket, 31 first breathable layer, 32 second breathable layer, 321 boss

[0035] structure, 33 buffer layer, 331 first opening, 332 buffer block;

[0036] 400 batteries; 500 electrical equipment. DETAILED DESCRIPTION

[0037] In the description of the application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically limited. In the embodiment of the present application, all directional indications (such as up, down, left, right, front, back, top, bottom ...) are only used to explain the relative position relationship, motion conditions, etc. between the components under a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their deformations are intended to cover non-exclusive inclusions. For example, the process, method, system, product or equipment comprising a series of steps or units are not limited to the steps or units listed, but optionally also include the steps or units not listed, or optionally also include other steps or units inherent to these processes, methods, products or equipment.

[0038] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] Application Overview

[0041] With the rapid development of battery technology, large cylindrical cells and other battery products with high energy density and high safety have gradually gained favor in the industry. At present, the industry usually adopts cells with the same-side tab design. Battery products using this design need to set the explosion-proof valve and gasket at the non-tab end of the cell to form a cell-gasket-explosion-proof valve assembly, thereby reducing the internal resistance of the cell structure.

[0042] However, whether the explosion-proof valve of the battery is opened usually depends on whether the internal air pressure reaches the threshold, and the battery cell safety test results show that the gasket has a certain barrier effect on the gas flow, resulting in large pressure fluctuations when the explosion-proof valve is opened, which reduces the safety and stability of the battery cell. At present, it is usually adopted to open air holes on the hard gasket to increase the permeability of the airflow. However, since the outer surface of the battery cell is covered with a diaphragm during assembly, the diaphragm will extend beyond the battery cell at the non-polar ear end, and it is easy to be squeezed and deformed by the gasket, which will also affect the normal circulation of the gas, and at the same time will destroy the integrity of the battery cell, affect the quality of the battery product, and cause certain safety hazards.

[0043] Some embodiments of the battery cell, battery and electrical equipment in the technical solution of the utility model are provided below.

[0044] In an embodiment of the first aspect of the present utility model, a battery cell 100 is provided, such as Figure 1 and Figure 2 As shown, the battery cell 100 includes a housing 1, a battery cell 2 and a flexible gasket 3. In the first direction, an explosion-proof valve 11 (e.g. Figure 1 The top of the housing 1 shown in the figure is provided with an explosion-proof valve 11). The battery cell 2 and the flexible breathable gasket 3 are both arranged in the housing 1; the non-polar ear end 21 of the battery cell 2 is arranged corresponding to the explosion-proof valve 11, so as to Figure 1 For example, the top of the battery cell 2 is a non-polar ear end 21, and is arranged opposite to the explosion-proof valve 11 at the top of the shell 1. The flexible breathable gasket 3 is arranged between the non-polar ear end 21 of the battery cell 2 and the explosion-proof valve 11, and the flexible breathable gasket 3 includes a first breathable layer 31 and a second breathable layer 32; the first breathable layer 31 and the second breathable layer 32 are arranged in sequence in the first direction, wherein the first breathable layer 31 is in contact with the non-polar ear end 21 of the battery cell 2, and the second breathable layer 32 is arranged on the side of the first breathable layer 31 facing the explosion-proof valve 11, that is, at Figure 1 In the example, the second air permeable layer 32 is located above the first air permeable layer 31 , and the second air permeable layer 32 covers the explosion-proof valve 11 .

[0045] It can be understood that in actual applications, the gap between the battery cell 2 and the explosion-proof valve 11 inside the housing 1 is relatively small, and the explosion-proof valve 11 has high requirements for gas circulation when opening the valve. The existing hard gasket has a blocking effect on the airflow, which is not conducive to the fluidity of the gas and easily causes large fluctuations in the opening pressure. Even if a gasket structure with a vent is used, it is easy to form local airflow fluctuations near the vent due to excessive air pressure, affecting the safety of the battery; moreover, the existing hard gasket is in contact with the diaphragm 22 of the battery cell 2, and the opening of the vent can only improve the airflow blocking problem to a certain extent, but it is difficult to eliminate the compression deformation effect of the gasket on the diaphragm 22. Long-term use will not only cause damage to the diaphragm 22 and destroy the integrity of the battery cell 2, but also further cause the gas transmission channel to be blocked due to the compression deformation of the diaphragm 22.

[0046] The battery cell 100 in this embodiment uses a flexible breathable gasket 3, which can not only buffer and support the battery cell 2, prevent the diaphragm 22 of the battery cell 2 from being squeezed and deformed, and is conducive to improving the protective effect of the diaphragm 22 and the battery cell 2, but also has good air permeability, which can allow gas to pass through the flexible breathable gasket 3 when the explosion-proof valve 11 is opened, so as to quickly release the air pressure and reduce safety hazards. Moreover, different positions on the flexible breathable gasket 3 are breathable, which can allow airflow to pass through evenly, which is conducive to enhancing the stability of the gas flow process and preventing large airflow fluctuations in local areas.

[0047] It should be noted that the explosion-proof valve 11 in the present invention can be one or more, and can be made by setting a notch on the shell 1 to form a weak area, or other forms of explosion-proof valves can be used according to the needs of use; in addition, the position of the explosion-proof valve 11 is not limited to Figure 1 The top of the shell 1 shown in the figure can also be set at other positions. The non-polar ear end 21 of the battery cell 2 and the flexible breathable gasket 3 are both set corresponding to the explosion-proof valve 11.

[0048] In addition, the battery cell 100 in the present invention includes but is not limited to a cylindrical battery, and the situation in the following embodiments is the same.

[0049] In a further embodiment of the utility model, in the flexible breathable gasket 3, the air permeability of the first breathable layer 31 is 0.5s / ml to 1.5s / ml, and correspondingly, the air permeability of the second breathable layer 32 is 0.2s / ml to 2s / ml. Among them, the first breathable layer 31 mainly plays a transitional role between the battery core 2 and the second breathable layer 32, and the second breathable layer 32 mainly plays a ventilation role. By setting the above-mentioned air permeability, the first breathable layer 31 and the second breathable layer 32 can both achieve their respective functions and corresponding ventilation requirements, and will not block the transmission of the gas generated inside the battery core 2, which is conducive to maintaining air pressure balance.

[0050] Furthermore, in a specific implementation, Figure 1 and Figure 2As shown, in the first direction, the thickness L1 of the first air permeable layer 31 is 0.1mm to 0.5mm, and the thickness L2 of the second air permeable layer 32 is 0.2mm to 1mm. Since the second air permeable layer 32 plays a major role in the flexible air permeable gasket 3, the above-mentioned thickness setting is matched with the air permeability of the first air permeable layer 31 and the second air permeable layer 32. On the one hand, it is beneficial to enhance the air permeability of the flexible air permeable gasket 3, and on the other hand, the second air permeable layer 32 can also play a role in buffering, bearing pressure, and reducing weight for the battery cell 2. In addition, the overall thickness of the flexible air permeable gasket 3 can meet the assembly requirements, and will not occupy too much space in the first direction, so that the battery cell 100 can maintain a high energy density.

[0051] In a further embodiment of the present invention, Figure 1 and Figure 2 As shown, the second air permeable layer 32 is an elastic air permeable layer, the first air permeable layer 31 is a breathable film layer, and the first air permeable layer 31 is fixedly connected to the second air permeable layer 32. The elasticity of the second air permeable layer 32 can effectively enhance the buffering performance of the flexible air permeable gasket 3 to enhance the protective effect on the battery cell 2. The first air permeable layer 31 and the second air permeable layer 32 are fixedly connected to form an integral structure to fix the second air permeable layer 32 to improve the overall stability of the flexible air permeable gasket 3.

[0052] Specifically, the elastic breathable layer can be made of plastic or plant fiber; when the elastic breathable layer is made of plastic, foam made of plastic particles after foaming can be used. Foam has good elasticity and air permeability, and can simultaneously meet the elastic buffering and air permeability requirements of the second breathable layer 32. The second breathable layer 32 made of foam can buffer the battery cell 2, and because the foam material is relatively soft, it can reduce the shrinkage of the diaphragm 22 of the battery cell 2, so that the structure of the diaphragm 22 does not deform, which is conducive to further ensuring the transmission stability of the gas generated inside the battery cell 2.

[0053] Of course, in addition to foam, the second breathable layer 32 may also be made of other materials with good breathability and support.

[0054] Preferably, the first breathable layer 31 can be made of the same material as the diaphragm 22 of the battery cell 2. For example, the first breathable layer 31 can be made of a PP breathable film layer or a PE breathable film layer. After the flexible breathable gasket 3 is assembled with the battery cell 2, the first breathable layer 31 can be used to protect the diaphragm 22 of the battery cell 2.

[0055] It can be understood that since the flexible breathable gasket 3 contacts the diaphragm 22 of the battery cell 2 after assembly, and the surface flatness of the foam structure of the second breathable layer 32 is not high, if the second breathable layer 32 directly contacts the diaphragm 22 of the battery cell 2, it is easy to cause the diaphragm 22 to deform and be damaged. The diaphragm 22 of the battery cell 2 is usually made of PP, PE and other materials. By setting a breathable film layer of the same material as the diaphragm 22 as a transition layer between the second breathable layer 32 and the battery cell 2, the friction between the first breathable layer 31 and the diaphragm 22 can be effectively reduced to prevent the diaphragm 22 from being deformed and damaged. In addition, the PP breathable film layer and the PE breathable film layer themselves have good air permeability, which can meet the circulation requirements of the gas generated inside the battery cell 2 and will not block the gas.

[0056] In a further embodiment of the present invention, Figure 3 and Figure 4 As shown, the flexible breathable pad 3 further includes a buffer layer 33. The buffer layer 33 is disposed on one side of the second breathable layer 32 away from the first breathable layer 31 in the first direction (for example Figure 3 The buffer layer 33 is fixedly connected to the second breathable layer 32, and the buffer layer 33 abuts against the inner wall surface of the housing 1 on a side away from the second breathable layer 32 in the first direction (for example Figure 3 The top surface of the buffer layer 33 shown in the figure abuts against the inner top surface of the shell 1), so that the buffer layer 33 plays a supporting and buffering role between the shell 1 and the second air-permeable layer 32, preventing the second air-permeable layer 32 and the first air-permeable layer 31 from being damaged by the extrusion deformation of the shell 1, thereby preventing the air permeability from being affected by deformation and damage. Among them, a first opening 331 is opened on the buffer layer 33 at a position opposite to the explosion-proof valve 11, and the first opening 331 is connected in the first direction to provide a channel for gas flow to prevent the buffer from blocking the gas flow.

[0057] Furthermore, in a specific implementation, the buffer layer 33 is a silicone layer made of silicone material, so as to utilize the flexible buffering effect of the silicone layer to provide support and buffering between the second breathable layer 32 and the inner wall surface of the shell 1, thereby preventing the second breathable layer 32 from directly contacting the inner wall surface of the shell 1.

[0058] Furthermore, in a specific implementation, the thickness L3 of the buffer layer 33 in the first direction is 0.2 mm to 0.5 mm. It can be understood that the internal space of the battery cell 100 is limited. If the thickness L3 of the buffer layer 33 is too large, it will occupy more space, which is not conducive to the assembly of other structures. At the same time, if the thickness L3 of the buffer layer 33 is too large, it may also produce a large squeezing effect on the second air permeable layer 32, the first air permeable layer 31 and the diaphragm 22 of the battery cell 2, thereby damaging the first air permeable layer 31, the second air permeable layer 32 or the diaphragm 22; and if the thickness L3 of the buffer layer 33 is too small, it may affect the buffering effect. The above thickness setting can meet the support and buffering requirements on the one hand, and can minimize the space occupied by the buffer layer 33 on the other hand.

[0059] In a further embodiment of the present invention, a specific implementation of the buffer layer 33 is provided, such as Figure 4 and Figure 5 As shown, in the flexible breathable gasket 3, the buffer layer 33 is a continuous structure extending around the circumference of the first opening 331, that is, the circumference of the first opening 331 is a closed structure, for example Figure 5 In the example, the buffer layer 33 forms a continuous closed shape with the inner wall surface of the shell 1 in the circumferential direction of the first opening 331, and the force is more uniform when squeezed, and the buffer effect is better. Figure 5 The annular continuous structure shown in Figure 6 The rectangular continuous structure shown in the figure can of course also be a continuous structure of other shapes, which can be specifically arranged according to the shapes of the battery cell 2 and the shell 1 to meet the assembly requirements.

[0060] Another specific implementation method is provided in a further embodiment of the present utility model, such as Figures 7 and 8 As shown, in the flexible breathable gasket 3, the buffer layer 33 includes a plurality of buffer blocks 332 arranged at intervals along the circumference of the first opening 331, that is, the first opening 331 is a non-closed structure in the circumferential direction, and accordingly, the buffer layer 33 is an intermittent structure in the circumferential direction around the first opening 331, for example Figure 8 The buffer layer 33 is composed of a plurality of buffer blocks 332 arranged at intervals, which can further reduce the material used in the buffer layer 33 and expand the air flow channel, so as to further enhance the overall air permeability while satisfying the buffering function. According to the different shapes of the housing 1 and the battery cell 2, the buffer block 332 can adopt a matching shape structure and arrangement, such as Figure 8 In the example in FIG. 1 , the buffer block 332 may be an arc-shaped block structure and arranged at intervals along the circumferential direction. Preferably, a plurality of buffer blocks 332 are arranged at equal intervals in the circumferential direction, and the force is relatively uniform. Alternatively, the buffer block 332 may be arranged at equal intervals along the circumferential direction. Fig. 9In the example, the buffer block 332 adopts an L-shaped block structure, and four L-shaped buffer blocks 332 are arranged in an intermittent rectangular structure, which can also meet the buffer and ventilation requirements. Of course, multiple buffer blocks 332 can also adopt other shapes and arrangements, which will not be repeated here.

[0061] In a further embodiment of the present invention, Fig.10 As shown, a boss structure 321 is further provided on the side of the second air-permeable layer 32 facing the buffer layer 33, and the boss structure 321 penetrates into the first opening 331 of the buffer layer 33. Preferably, the shape of the boss structure 321 is adapted to the first opening 331, and the top of the boss structure 321 is flush with the top surface of the buffer layer 33, so that the boss structure 321 and the buffer layer 33 can contact the inner wall surface of the shell 1 at the same time, thereby further increasing the contact area with the inner wall surface of the shell 1, which is conducive to enhancing the buffering effect, and at the same time can alleviate the problem of uneven local force, so that the force conduction between the flexible air-permeable gasket 3 and the shell 1 and the battery cell 2 is more uniform, thereby further enhancing the protective effect of the diaphragm 22 of the battery cell 2.

[0062] Preferably, when the buffer layer 33 adopts a circumferentially continuous structure, when the first opening 331 is Figure 5 When the circular opening structure shown in FIG. 3 is a circular opening structure, the boss structure 321 uses a circular boss of the same size and fills the internal space of the first opening 331; when the first opening 331 is Figure 6 When the rectangular opening structure shown in FIG. 3 is used, the boss structure 321 correspondingly adopts a rectangular boss of the same size and fills the internal space of the first opening 331. When the buffer layer 33 adopts a circumferential discontinuous structure, such as Figure 8 , Fig. 9 In the example, the boss structure 321 can be set to a structural form that only fills the internal space of the first opening 331, or it can be set to a structural form that simultaneously fills the internal space of the first opening 331 and the gap space between the buffer blocks 332. The specific setting can be based on assembly requirements and will not be repeated here.

[0063] In a specific embodiment of the present invention, Figure 3 and Figure 4As shown, the battery cell 100 is specifically a cylindrical battery; in the battery cell 100, two explosion-proof valves 11 are provided on the top of the shell 1, the non-polar ear end 21 of the battery cell 2 faces the top of the shell 1, and the outer surface of the battery cell 2 is covered with a diaphragm 22; a flexible breathable gasket 3 is provided between the non-polar ear end 21 and the inner top wall of the shell 1, and the first direction is the height direction of the battery cell 100. In the first direction, the flexible breathable gasket 3 includes a first breathable layer 31, a second breathable layer 32 and a buffer layer 33 arranged in sequence from bottom to top; the first breathable layer 31 is a PP breathable film layer with a permeability of 0.5s / ml to 1.5s / ml, the second breathable layer 32 is a foam layer with a permeability of 0.2s / ml to 2s / ml, and the buffer layer 33 is a silica gel layer, wherein the buffer layer 33 is a circular ring structure; the first breathable layer 31, the second breathable layer 32 and the buffer layer 33 are fixedly connected in sequence. The flexible breathable gasket 3 is a disc-shaped structure that matches the shape of the battery core 2, and its diameter is in the range of 30 mm to 50 mm; the total thickness of the flexible breathable gasket 3 in the first direction is 0.5 mm to 2 mm, the thickness L1 of the first breathable layer 31 is 0.1 mm to 0.5 mm, the thickness L2 of the second breathable layer 32 is 0.2 mm to 1 mm, and the thickness L3 of the buffer layer 33 is 0.2 to 0.5 mm. Preferably, the thickness of the first breathable layer 31 is equal to the thickness of the second breathable layer 32.

[0064] It can be understood that if the thickness of the flexible gasket 3 is too large, the gas transmission distance will be increased, and more space in the height direction of the battery cell will be occupied, thereby affecting the battery energy density. If the thickness of the flexible gasket 3 is too small, it is easy to deform, thereby affecting the gas passing efficiency. The above-mentioned size setting in this embodiment can ensure appropriate ventilation efficiency without occupying a large height space, and can enable the battery cell to maintain a large energy density.

[0065] In an embodiment of the second aspect of the present utility model, a battery 400 is provided, such as Figure 1 and Fig.11 As shown, the battery 400 includes the battery cell 100 in any embodiment of the first aspect described above.

[0066] Furthermore, the battery 400 in this embodiment may specifically be a battery pack, a battery module, or other forms of battery structures.

[0067] Furthermore, the battery 400 in this embodiment may include a plurality of battery cells 100 , and the plurality of battery cells 100 may be connected in series or in parallel through corresponding connection structures.

[0068] Furthermore, according to actual application needs, the battery 400 in this embodiment can also be provided with multiple battery cells 2 in a shell 1, wherein an explosion-proof valve 11 is provided at a position on the shell 1 corresponding to the non-polar ear end 21 of each battery cell 2, and a flexible breathable gasket 3 is provided between the non-polar ear end 21 of each battery cell 2 and the inner wall surface of the shell 1.

[0069] When an abnormality occurs in the battery cell 2 in the battery cell 100 and gas is generated, the explosion-proof valve 11 opens, and the gas can quickly flow toward the explosion-proof valve 11 through the flexible breathable gasket 3 and be discharged out of the shell 1 through the explosion-proof valve 11, thereby achieving exhaust and pressure release, preventing safety accidents such as explosions caused by excessive air pressure, and is beneficial to improving the safety of the battery.

[0070] In addition, the battery 400 in this embodiment also has all the beneficial effects of the battery cell 100 in any embodiment of the first aspect mentioned above, which will not be repeated here.

[0071] In the embodiment of the third aspect of the present utility model, an electric device 500 is also provided, such as Figure 1 , Fig.11 and Fig.12 As shown, the electric device 500 includes the battery 400 monomer 100 in any embodiment of the second aspect described above, and the battery 400 serves as a power supply device to supply power to the electric device 500.

[0072] The electrical equipment 500 includes but is not limited to electric vehicles.

[0073] In addition, the electrical equipment 500 in this embodiment also has all the beneficial effects of the battery 400 in any embodiment of the second aspect mentioned above, which will not be repeated here.

[0074] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0075] The block diagrams of the devices, apparatuses, equipment and systems involved in the present utility model are only illustrative examples and are not intended to require or imply that they must be connected, arranged and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment and systems can be connected, arranged and configured in any manner. Words such as "including", "comprising", "having" and the like are open words, referring to "including but not limited to" and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to" and can be used interchangeably with them. It should also be noted that in the apparatus and equipment of the present utility model, each component can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present utility model.

[0076] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize some variations, modifications, changes, additions and sub-combinations thereof. The above description of the disclosed aspects is provided to enable any technician in the field to make or use the utility model. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the utility model. Therefore, the utility model is not intended to be limited to the aspects shown herein, but in accordance with the widest range consistent with the principles and novel features of this utility model.

[0077] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cell, characterized in that: include: A housing (1), wherein an explosion-proof valve (11) is provided at one end of the housing (1) in a first direction; The battery core (2) is arranged in the housing (1), and the non-polar ear end (21) of the battery core (2) is arranged corresponding to the explosion-proof valve (11); A flexible breathable gasket (3) is arranged in the shell (1) and is located between the non-polar ear end (21) of the battery cell (2) and the explosion-proof valve (11); the flexible breathable gasket (3) comprises a first breathable layer (31) and a second breathable layer (32) arranged in sequence in a first direction; wherein the first breathable layer (31) is in contact with the non-polar ear end (21), and the second breathable layer (32) is arranged on the side of the first breathable layer (31) facing the explosion-proof valve (11), and covers the explosion-proof valve (11).

2. The battery cell according to claim 1, characterized in that: The air permeability of the first air permeable layer (31) is 0.5 s / ml to 1.5 s / ml; The air permeability of the second air permeable layer (32) is 0.2 s / ml to 2 s / ml.

3. The battery cell according to claim 1, characterized in that: The second air-permeable layer (32) is an elastic air-permeable layer; The first air permeable layer (31) is a breathable film layer, and the first air permeable layer (31) is fixedly connected to the second air permeable layer (32).

4. The battery cell according to claim 2, characterized in that: The thickness of the first air permeable layer (31) in the first direction is 0.1 mm to 0.5 mm; The thickness of the second air-permeable layer (32) in the first direction is 0.2 mm to 1 mm.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The flexible breathable gasket (3) further comprises: a buffer layer (33), the buffer layer (33) being arranged on a side of the second air-permeable layer (32) away from the first air-permeable layer (31) and being fixedly connected to the second air-permeable layer (32), and the side of the buffer layer (33) away from the second air-permeable layer (32) being in contact with an inner wall surface of the shell (1); Wherein, a first opening (331) is provided on the buffer layer (33) at a position opposite to the explosion-proof valve (11), and the first opening (331) is through-going in a first direction.

6. The battery cell according to claim 5, characterized in that: The buffer layer (33) is a silica gel layer; and / or The buffer layer (33) has a thickness in the first direction of 0.2 mm to 0.5 mm.

7. The battery cell according to claim 5, characterized in that: The buffer layer (33) is a continuous structure extending circumferentially around the first opening (331); or The buffer layer (33) comprises a plurality of buffer blocks (332), and the plurality of buffer blocks (332) are arranged at intervals along the circumference of the first opening (331).

8. The battery cell according to claim 5, characterized in that: A boss structure (321) is provided on a side of the second air permeable layer (32) facing the buffer layer (33), and the boss structure (321) penetrates into the first opening (331).

9. A battery, characterized in that: include: A battery cell as claimed in any one of claims 1 to 8.

10. An electrical device, characterized in that: include: The battery as claimed in claim 9.

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