Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment, the battery monomer comprises an electrode assembly and a shell, the shell accommodates the electrode assembly, the shell comprises a first wall, the first wall is provided with a mounting hole used for mounting a pressure relief mechanism, and the part, adjacent to the mounting hole, of the first wall is provided with a corrugated part. According to the pressure relief mechanism, the corrugated part is arranged at the position close to the mounting hole, the acting force acting on the first wall can be buffered through the corrugated part, so that the acting force transmitted to the mounting hole is reduced, and the possibility of damage to the mounting hole and the pressure relief mechanism is reduced.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery cell, a battery device, and an electrical equipment. Background Art

[0002] A battery explosion-proof valve is installed on the housing of the battery. The main function of the explosion-proof valve is to monitor the pressure and temperature inside the battery. When the pressure or temperature exceeds the set value, the explosion-proof valve will rupture from the notch and relieve pressure to reduce the pressure inside the battery and reduce the occurrence of accidents. When the battery collides with an external structure, damage is likely to occur at the battery explosion-proof valve, which may affect the use of the battery. Summary of the Utility Model

[0003] This application provides a battery cell, a battery device, and an electrical equipment, aiming to improve the problem that damage is likely to occur at the battery pressure relief mechanism.

[0004] To achieve the above technical effects, a technical solution adopted in this application is: providing a battery cell, including:

[0005] An electrode assembly;

[0006] A housing that houses the electrode assembly. The housing includes a first wall, and an installation hole for installing a pressure relief mechanism is formed on the first wall. A wrinkled portion is provided at a position adjacent to the installation hole on the first wall.

[0007] In this application, by providing an installation hole on the first wall, the pressure relief mechanism can be conveniently installed at a preset position on the first wall, thereby improving the reliability of the battery cell; by providing a wrinkled portion at a position adjacent to the installation hole on the first wall, when the first wall collides with an external structure, the wrinkled portion can buffer the acting force applied to the first wall, reducing the transmission of the acting force to the installation hole and the pressure relief mechanism, and thus reducing the damage generated at the pressure relief mechanism.

[0008] Wherein, a part of the first wall protrudes inwardly from the housing to form the wrinkled portion. In this example, at least part of the wrinkled portion protrudes inwardly from the housing, so that the wrinkled portion does not occupy the external space of the housing and reduces the interference of the wrinkled portion on the external structure of the housing.

[0009] Wherein, a part of the first wall protrudes outwardly from the housing to form the wrinkled portion. In this example, the wrinkled portion is provided by protruding outwardly from the first wall of the housing, which is convenient for forming the wrinkled portion.

[0010] Wherein, the number of the wrinkled portions is multiple, and the multiple wrinkled portions are arranged at intervals. In this example, by providing multiple wrinkled portions arranged at intervals, the multiple wrinkled portions can play a buffering role at different positions and reduce the acting force received at the pressure relief mechanism.

[0011] Among them, at least one wrinkled portion has a strip-shaped structure. In this example, by adopting a strip-shaped wrinkled portion, the formation of the wrinkled portion can be facilitated, and the formation cost of the housing can be reduced.

[0012] Among them, at least two wrinkled portions are arranged in a strip shape, and the length directions of at least two wrinkled portions are arranged at an angle. In this example, the length directions of at least two wrinkled portions are arranged at an angle so that at least two wrinkled portions are not parallel, and thus the force in different directions can be buffered by the wrinkled portions.

[0013] Among them, the wrinkled portion is arranged in a ring shape along the outer periphery of the mounting hole. In this example, by making the wrinkled portion distributed in a ring shape on the outer periphery of the mounting hole, a buffer structure can be formed at all parts of the outer periphery of the mounting hole to buffer the acting forces in all directions and reduce the acting forces received at the pressure relief mechanism.

[0014] Among them, the distance between the side of the wrinkled portion adjacent to the mounting hole and the mounting hole is not less than 3 mm and not more than 5 mm.

[0015] In this example, by reasonably setting the distance between the wrinkled portion and the mounting hole, on the one hand, the wrinkled portion can buffer the mounting hole part, and on the other hand, the problem of inconvenient installation of the pressure relief mechanism caused by the wrinkled portion being too close to the mounting hole can be reduced.

[0016] Among them, the battery cell further includes a pressure relief mechanism arranged in the mounting hole. The pressure relief mechanism has a first surface and a second surface arranged oppositely. The first surface faces the electrode assembly, and the second surface is partially recessed in the direction of the inner side of the housing so that the first surface protrudes in the direction of the electrode assembly.

[0017] In this example, by protruding the pressure relief mechanism in the direction of the electrode assembly, the pressure relief mechanism can be arranged in a concave shape. On the one hand, the pressure relief valve will not interfere with the outside of the housing, and on the other hand, when the first wall is collided by an external foreign object, the direct collision between the pressure relief mechanism and the foreign object can be reduced, thereby improving the reliability of the pressure relief mechanism.

[0018] Among them, a convex block is arranged on the side of the first wall facing the electrode assembly. The convex block can be used to support the electrode assembly so that there is a gap between the electrode assembly and the first wall, and thus the air flow can flow along the gap between the electrode assembly and the first wall in the direction of the pressure relief mechanism to reduce the local overheating problem caused by the obstruction of the air flow in the battery cell.

[0019] Among them, the height of the convex block is not less than the maximum height of the first surface. The convex block can be used to support and protect the pressure relief mechanism to reduce the direct contact between the electrode assembly and the pressure relief mechanism and improve the reliability of the pressure relief mechanism.

[0020] Wherein, the housing further includes a second wall connected to the first wall, and the second wall is disposed at an angle to the first wall;

[0021] A chamfer is provided at the connection between the first wall and the second wall, and the distance between the end of the bump away from the first wall and the first wall is not less than the distance between the end of the chamfer away from the first wall and the first wall.

[0022] In this example, the second wall and the first wall are respectively wall surfaces of the housing in different directions. By making the distance between the end of the bump away from the first wall and the first wall not less than the distance between the end of the chamfer away from the first wall and the first wall, the bump can support and block the electrode assembly, so as to reduce the direct contact between the electrode assembly and the chamfer.

[0023] Wherein, the number of the bumps is multiple, and at least two bumps are respectively disposed on both sides of the mounting hole along the length direction of the first wall. By respectively disposing bumps on both sides of the mounting hole along the length direction of the first wall, the bumps can respectively play a supporting role on both sides of the mounting hole. On the one hand, it can reduce the direct contact between the pressure relief mechanism and the electrode assembly, and on the other hand, it can improve the air flow performance on both sides of the pressure relief mechanism along the length direction of the first wall, thereby improving the pressure relief performance of the battery cell.

[0024] Wherein, in the vertical projection of the bump on the first wall, at least part of the bumps are arranged in a long strip shape; the length direction of at least part of the bumps is arranged parallel to the length direction of the first wall. In this example, part of the bumps are arranged parallel to the length direction of the first wall, which can support the electrode assembly along the length direction of the first wall to improve the structural stability of the electrode assembly.

[0025] Wherein, in the vertical projection of the bump on the first wall, at least part of the bumps are arranged in a long strip shape; the length direction of at least part of the bumps is arranged at an angle to the length direction of the first wall. In this example, the length direction of the bump is arranged at an angle to the length direction of the first wall, which can increase the supporting surface of the bump to improve the stability of the electrode assembly.

[0026] Wherein, in the vertical projection of the bump on the first wall, at least part of the bumps are circularly arranged. The circularly projected bumps in this example can improve the forming performance of the bumps.

[0027] Wherein, at least part of the bumps are arranged close to the chamfer. By arranging the bumps close to the chamfer, the electrode assembly can be supported by the bumps close to the chamfer, reducing the direct contact between the electrode assembly and the chamfer.

[0028] Wherein, a part of the first wall is recessed inward toward the electrode assembly to form the bump. In this example, the first wall is recessed to form the bump, which helps to reduce the weight of the housing.

[0029] Wherein, the housing further includes a second wall, one end of the second wall is connected to the first wall, and the other end extends upward above the first wall. In this example, the first wall is located below the second wall, and the pressure relief mechanism is installed on the first wall, which can form a structure for relieving pressure from the bottom on the housing.

[0030] The present application also provides an example of a battery device, including:

[0031] a box body; and

[0032] a battery cell as in any of the above examples, the battery cell being disposed inside the box body.

[0033] The present application also provides an example of an electrical device, including the battery device as in the above example, and the battery device is used to supply power to the electrical device. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0035] Figure 1 is a schematic structural diagram of an example of the electrical device of the present application;

[0036] Figure 2 is a schematic structural diagram of an example of the battery device of the present application;

[0037] Figure 3 is a schematic structural diagram of an example of the housing of the battery cell of the present application in an open state;

[0038] Figure 4 is a schematic external structural diagram of an example of the battery cell of the present application;

[0039] Figure 5 is Figure 4 a schematic diagram of an example of the vertical projection of the pressure relief mechanism on the first wall in

[0040] Figure 6 is a schematic internal structural diagram of an example of the housing of the present application;

[0041] Figure 7 is Figure 6 a partial enlarged view of the 6A part in

[0042] Figure 8 is a schematic structural diagram of an example of the first wall of the present application;

[0043] Figure 9 is Figure 8Schematic diagram of the vertical projection of the pressure relief mechanism on an example of the first wall;

[0044] Figure 10 It is a schematic diagram of the external structure of another example of the battery cell of the present application;

[0045] Figure 11 Is Figure 10 Schematic diagram of the vertical projection of the pressure relief mechanism on an example of the first wall;

[0046] Figure 12 It is a schematic diagram of the external structure of yet another example of the battery cell of the present application;

[0047] Figure 13 Is Figure 12 Schematic diagram of the vertical projection of the pressure relief mechanism on an example of the first wall;

[0048] Figure 14 It is a schematic diagram of the external structure of still another example of the battery cell of the present application;

[0049] Figure 15 Is Figure 14 Schematic diagram of the vertical projection of the pressure relief mechanism on an example of the first wall;

[0050] Figure 16 It is a schematic diagram of the structure of an example of the inner side of the housing of the present application.

[0051] Wherein: 1000, electrical equipment; 100, battery device; 10, battery cell; 11, housing; 12, first wall; 121, wrinkled portion; 122, bump; 13, second wall; 14, chamfer; 15, electrode assembly; 16, pressure relief mechanism; 161, first surface; 162, second surface; 17, mounting hole; 20, box body; 21, first shell; 22, second shell; 200, driving device; 300, control device. Detailed implementation manners

[0052] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0053] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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. Therefore, it should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically and clearly defined. It should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" in the description of the present application should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0054] In the present application, the term "exemplary" is used to mean "serving as an example, instance, or illustration". Any embodiment described in the present application as "exemplary" is not necessarily to be construed as more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the present application. In the following description, details are set forth for the purpose of explanation. It should be understood that those of ordinary skill in the art can recognize that the present application can be implemented without these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed in the present application.

[0055] With the development of the market situation, the application of batteries has become more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as military equipment and aerospace. With the continuous expansion of the battery application field, the market demand is also constantly increasing. The battery in the example of this application can be used in mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, and electrical equipment for spacecraft. The battery can be used to provide power for electrical equipment, and the battery can also be used to supply power to electronic devices on the electrical equipment.

[0056] The battery may include a box body, and battery cells may be installed in the box body. The battery generally may include one or more battery cells. When multiple battery cells are arranged in the box body, the multiple battery cells may be arranged in a row and a column, a row and multiple columns, or other ways; the multiple battery cells may be connected in series, in parallel, or in a series-parallel hybrid connection. Other functional components may also be provided on the battery. An electrode assembly may be provided inside the battery cell, and the electrode assembly may be formed by laminating or winding electrode plates.

[0057] When the internal temperature of the battery cell rises, in order to reduce the possibility of thermal runaway of the battery cell, pressure relief can be carried out through a pressure relief mechanism such as a burst valve to balance the internal pressure of the battery cell. The burst value of the pressure relief mechanism refers to the pressure threshold at which the pressure relief mechanism suddenly opens and releases the internal gas after withstanding a certain pressure. The selection of the burst value needs to be determined according to the specific battery type and usage scenario, generally considering factors such as the maximum charging and discharging pressure of the battery, as well as temperature rise and current. The selection of the burst value also needs to consider the manufacturing process of the pressure relief mechanism and the characteristics of the material, ensuring that the pressure relief mechanism can reliably open and release the internal gas within a certain range, and ensuring that the pressure relief mechanism itself will not fail or be damaged due to the selection of the burst value.

[0058] Due to the need to install a pressure relief mechanism, a hole needs to be opened on one wall surface of the battery cell where the pressure relief mechanism is provided to fix the pressure relief mechanism on this wall surface. With the damage to this surface caused by the hole-opening operation, it is possible to reduce the structural strength of this surface. Especially at the connection between the hole-opening part and the pressure relief mechanism, it is easy to be damaged under external impact.

[0059] In view of the above problems, this application proposes a battery cell, which includes an electrode assembly and a housing that can accommodate the electrode assembly. The housing includes a first wall, and an installation hole for installing a pressure relief mechanism is opened on the first wall. A wrinkled part is provided at a position adjacent to the installation hole on the first wall. In this application, by providing a wrinkled part at a position adjacent to the installation hole, the force acting on the first wall can be buffered through the wrinkled part to reduce the force transmitted to the installation hole, thereby reducing the possibility of damage at the installation hole and the pressure relief mechanism.

[0060] Please refer to Figure 1 , the battery cell 10 in the example of the present application can be used in an electrical device 1000. The electrical device 1000 can be a device that uses the battery device 100 as a power source, or a device that uses the battery device 100 as the power source of an electrical component.

[0061] Please refer to Figure 2 , the battery cell 10 in the example of the present application can be used in the battery device 100. The battery device 100 can include one or more battery cells 10. When multiple battery cells 10 are used, the multiple battery cells 10 can be arranged and connected on the battery device 100 according to a preset rule.

[0062] Please refer to Figure 3 , Figure 4 and Figure 5 , an example of a battery cell 10 is proposed in the present application. The battery cell 10 includes an electrode assembly 15 and a housing 11. The housing 11 houses the electrode assembly 15. The housing 11 includes a first wall 12. An installation hole 17 for installing a pressure relief mechanism 16 is formed on the first wall 12. A wrinkled portion 121 is provided at a portion of the first wall 12 adjacent to the installation hole 17.

[0063] The electrode assembly 15 can be composed of electrode sheets arranged in a stacked manner or wound manner. The shape and size of the electrode assembly 15 can be adapted to the shape and size of the housing 11.

[0064] At least a part of the housing 11 is a hollow structure. The hollow portion of the housing 11 can be used to house the electrode assembly 15. The housing 11 can be made of materials such as PVC (polyvinyl chloride), plastic housing or metal housing.

[0065] The first wall 12 is a wall surface on the housing 11. Taking the battery shape shown in Figure 4 as an example, the first wall 12 can be the top wall at the upper end of the housing 11, or the bottom wall at the lower end of the housing 11. When the first wall 12 is the top wall of the housing 11, the battery cell 10 can be pressure-relieved through the pressure relief mechanism 16 provided at the upper end; when the first wall 12 is the bottom wall of the housing 11, the battery cell 10 can be pressure-relieved downward. It can be understood that the first wall 12 can also be a wall surface in other directions of the battery cell 10.

[0066] The installation hole 17 is a through hole formed on the first wall 12. The installation hole 17 communicates the inside and outside of the housing 11. When the pressure relief mechanism 16 is installed in the installation hole 17, the pressure relief mechanism 16 can be connected to at least one of the outer surface of the first wall 12, the inner surface of the first wall 12 or the inner wall surface of the installation hole 17. When the internal air pressure of the battery cell 10 increases, the pressure relief mechanism 16 can be used for pressure relief.

[0067] The wrinkled portion 121 is provided on the first wall 12. The wrinkled portion 121 may be a regular or irregular shape formed by local bending or deformation of the first wall 12. As a part of the first wall 12, the wrinkled portion 121 may be a region formed by locally applying a force to the first wall 12 to cause local deformation of the first wall 12. The wrinkled portion 121 is disposed adjacent to the mounting hole 17, which means that the wrinkled portion 121 is disposed close to the mounting hole 17, and there may be a gap between the wrinkled portion 121 and the edge of the mounting hole 17. In this example, the distance between the wrinkled portion 121 and the mounting hole 17 can be determined according to factors such as the position, size, shape of the mounting hole 17, the material of the first wall 12, the thickness of the first wall 12, the depth of the wrinkled portion 121, the shape of the wrinkled portion 121, and the size of the wrinkled portion 121. The distance between the wrinkled portion 121 and the mounting hole 17 refers to the distance between the edge of the side of the wrinkled portion 121 close to the mounting hole 17 and the mounting hole 17. Taking the wrinkled portion 121 as a ring shape as an example, the distance between the inner ring surface of the wrinkled portion 121 and the mounting hole 17 is the distance between the wrinkled portion 121 and the mounting hole 17.

[0068] In the example of the present application, by providing the wrinkled portion 121 at a position of the first wall 12 adjacent to the mounting hole 17, when an external force acts on the first wall 12, during the process of the acting force being conducted in the direction of the mounting hole 17, the wrinkled portion 121 can generate a certain amount of deformation under the action of the external force, and buffer the acting force through the local deformation of the wrinkled portion 121, reducing the acting force transmitted to the mounting hole 17. On the one hand, it can reduce the possibility of damage at the mounting hole 17. On the other hand, it can provide a certain stroke for the pressure relief mechanism 16 and reduce the damage to the pressure relief mechanism 16, so as to reduce the problem of pressure relief failure of the battery cell 10 caused by the damage of the pressure relief mechanism 16.

[0069] Please refer to Figure 6 and Figure 7 , in some examples, a part of the first wall 12 protrudes inwardly from the housing 11 to form the wrinkled portion 121.

[0070] The first wall 12 protrudes inwardly toward the inside of the housing 11, which means that a part of the first wall 12 is deformed inwardly toward the inside of the housing 11. When the electrode assembly 15 is installed inside the housing 11, the first wall 12 can be concave inwardly toward the electrode assembly 15, so that an uneven surface is formed on the surface of the first wall 12 facing the electrode assembly 15. In this example, by protruding the first wall 12 inwardly toward the inside of the housing 11 to form the wrinkled portion 121, on the one hand, it is convenient for the forming of the wrinkled portion 121 and reduces the forming difficulty of the wrinkled portion 121. On the other hand, the wrinkled portion 121 occupies the inner space of the housing 11, which can reduce the occupation of the external space of the housing 11 by the wrinkled portion 121 and reduce the interference between the wrinkled portion 121 and the external structure of the housing 11. In this example, when multiple wrinkled portions 121 are formed, the directions and heights of the multiple wrinkled portions 121 protruding inwardly toward the inside of the housing 11 can be the same or different.

[0071] In some examples, different from the previous example, a part of the first wall 12 protrudes outwardly toward the outside of the housing 11 to form the wrinkled portion 121. The first wall 12 protruding outwardly toward the outside of the housing 11 means that a part of the first wall 12 is deformed outwardly toward the outside of the housing 11, so that an uneven surface is formed on the side of the first wall 12 facing away from the electrode assembly 15. In this example, by deforming the first wall 12 outwardly toward the outside of the housing 11, it is convenient to determine the forming quality of the wrinkled portion 121 from the outside of the housing 11. In this example, when multiple wrinkled portions 121 are formed, the directions and heights of the multiple wrinkled portions 121 protruding outwardly toward the outside of the housing 11 can be the same or different.

[0072] Please refer to Figure 8 and Figure 9 , in some examples, a part of the first wall 12 protrudes inwardly toward the inside of the housing 11 to form the wrinkled portion 121, and a part of the first wall 12 protrudes outwardly toward the outside of the housing 11 to form the wrinkled portion 121. In this example, a part of the first wall 12 protrudes inwardly toward the inside of the housing 11 and a part protrudes outwardly toward the outside of the housing 11, so that uneven wrinkled surfaces are formed on both the inner and outer surfaces of the first wall 12 to improve the anti-deformation performance at the mounting hole 17. In this example, the wrinkled portion 121 protruding inwardly toward the inside of the housing 11 and the wrinkled portion 121 protruding outwardly toward the outside of the housing 11 can be regularly distributed or irregularly distributed.

[0073] Please refer to Figure 10 and Figure 11 , in some examples, the first wall 12 can protrude integrally inwardly toward the inside of the housing 11 to form the wrinkled portion 121. When observed from the outside of the housing 11, after the first wall 12 is concave inwardly, a concave structure with a rectangular cross-section can be formed.

[0074] In some examples, the number of the wrinkled portions 121 is multiple, and the multiple wrinkled portions 121 are arranged at intervals. The multiple wrinkled portions 121 being arranged at intervals means that the multiple wrinkled portions 121 can be arranged independently of each other along a preset rule. The multiple wrinkled portions 121 in this example can be an uneven structure formed by the first wall 12 protruding inward or outward from the inner side of the housing 11, or the multiple wrinkled portions 121 can also be an uneven structure formed by part of the first wall 12 protruding inward from the housing 11 and part of it protruding outward from the housing 11. The multiple wrinkled portions 121 can be regularly distributed on the outer periphery of the mounting hole 17. For example, the multiple wrinkled portions 121 can be annularly distributed along the outer periphery of the mounting hole 17, or the multiple wrinkled portions 121 can be spaced apart on both sides in the length direction or the width direction of the mounting hole 17. In this example, by adopting the arrangement of the multiple wrinkled portions 121, the deformation performance of the first wall 12 can be improved, the force acting on the pressure relief mechanism 16 can be buffered, and the reliability of the pressure relief mechanism 16 can be enhanced; by arranging the multiple wrinkled portions 121 at intervals, the wrinkled portions 121 can be dispersed to improve the buffering effect of the wrinkled portions 121 on forces in different directions.

[0075] In some examples, at least one of the wrinkled portions 121 has a strip-shaped structure. The strip-shaped structure means that when the wrinkled portion 121 is projected onto the first wall 12 in a direction perpendicular to the first wall 12, the wrinkled portion 121 has a long strip shape, and the long strip can be a quadrilateral with four vertex angles or a long strip with an arc-shaped end. In this example, by adopting the wrinkled portion 121 with a strip-shaped structure, the acting space of the wrinkled portion 121 can be extended, and the buffering effect of the wrinkled portion 121 can be improved.

[0076] In some examples, at least two of the wrinkled portions 121 are arranged in a strip shape, and the length directions of the at least two wrinkled portions 121 are arranged at an angle. The length directions of the at least two wrinkled portions 121 being arranged at an angle means that the two wrinkled portions 121 are not parallel. In this example, by adopting the non-parallel arrangement of the wrinkled portions 121, the wrinkled portions 121 can be used to buffer forces in different directions to further improve the buffering performance of the wrinkled portions 121.

[0077] In some examples, the wrinkled portion 121 is annularly arranged along the outer periphery of the mounting hole 17. In this example, the wrinkled portion 121 surrounds the outer periphery of the mounting hole 17 to buffer forces in different directions on the outer periphery of the mounting hole 17, thereby reducing the possibility of damage at the mounting hole 17 of the first wall 12.

[0078] In some examples, the distance between one side of the wrinkled portion 121 adjacent to the mounting hole 17 and the mounting hole 17 is not less than 3 mm and not more than 5 mm. One side of the wrinkled portion 121 adjacent to the mounting hole 17 refers to the side of the wrinkled portion 121 closest to the mounting hole 17. Taking the wrinkled portion 121 as an example of a ring shape, the wrinkled portion 121 is arranged around the periphery of the mounting hole 17, and the distance between the inner ring surface of the wrinkled portion 121 and the hole wall of the mounting hole 17 is not less than 3 mm, so as to reduce the problem of reduced structural strength at the mounting hole 17 caused by the too-close distance between the wrinkled portion 121 and the mounting hole 17; optionally, the distance between the inner ring surface of the wrinkled portion 121 and the mounting hole 17 is not more than 5 mm, so as to reduce the problem of reduced buffering effect of the wrinkled portion 121 caused by the too-large distance between the wrinkled portion 121 and the mounting hole 17. The distance between one side of the wrinkled portion 121 adjacent to the mounting hole 17 and the mounting hole 17 in this example can be 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm or any other value within the above range.

[0079] Please refer to Figure 5 and Figure 6 , in some examples, the battery cell 10 further includes a pressure relief mechanism 16 disposed in the mounting hole 17. The pressure relief mechanism 16 has a first surface 161 and a second surface 162 disposed opposite to each other. The first surface 161 faces the electrode assembly 15, and the second surface 162 is partially recessed in the direction of the inner side of the housing 11, so that the first surface 161 protrudes in the direction of the electrode assembly 15.

[0080] When the internal air pressure of the battery cell 10 rises, the pressure relief mechanism 16 is used for pressure relief to reduce the possibility of thermal runaway of the battery cell 10. The pressure relief mechanism 16 has a first surface 161 and a second surface 162 disposed opposite to each other. The first surface 161 faces the electrode assembly 15. The first surface 161 can be the inner surface of the pressure relief mechanism 16, and the second surface 162 is the outer surface of the pressure relief mechanism 16. The second surface 162 is partially recessed in the direction of the inner side of the housing 11, and the first surface 161 protrudes in the direction of the electrode assembly 15, so that the pressure relief mechanism 16 can be generally concave in the direction of the electrode assembly 15. In this example, by making the pressure relief mechanism 16 concave, when a foreign object contacts the first wall 12, the direct contact between the pressure relief mechanism 16 and the foreign object can be reduced, thereby reducing the damage to the pressure relief mechanism 16 by the foreign object.

[0081] Please refer to Figure 10 and Figure 11, in the example of the present application, a part of the first wall 12 can be recessed toward the inner side of the housing 11. The side of the recessed part on the first wall 12 facing the electrode assembly 15 can be used as the first surface 161 of the pressure relief mechanism 16, and the part of the recessed part on the first wall 12 facing the outside of the housing 11 can be used as the second surface 162 of the pressure relief mechanism 16. A notch can be formed on the recessed part of the first wall 12, so that the pressure relief mechanism 16 is directly formed on the first wall 12. The bent part of the recessed part on the first wall 12 can form the corrugated part 121.

[0082] Please refer to Figure 12 and Figure 13 , in some examples, a bump 122 is provided on the side of the first wall 12 facing the electrode assembly 15. The bump 122 protrudes from the surface of the first wall 12 facing the electrode assembly 15, so that the bump 122 can form a protruding structure on the surface of the first wall 12. The bump 122 can be used to block between the electrode assembly 15 and the first wall 12. In this example, the bump 122 can be integrally provided with the first wall 12, or the bump 122 can be separately provided from the first wall 12 and connected to each other. Due to the blocking of the bump 122, the electrode assembly 15 cannot directly contact the first wall 12, so that there is a gap for air flow between the electrode assembly 15 and the first wall 12. When the internal air pressure of the battery cell 10 increases, the air flow can flow along the gap between the electrode assembly 15 and the first wall 12 toward the pressure relief mechanism 16. The bump 122 can also be used to block the electrode assembly 15 from directly contacting the pressure relief mechanism 16 on one side of the first wall 12, so as to improve the pressure relief performance of the pressure relief mechanism 16. In this example, the bump 122 can adopt any shape and size, and the shape, size and installation position of the bump 122 can be determined according to the shape and size of the battery cell 10 and the electrode assembly 15.

[0083] In some examples, the height of the bump 122 is not less than the maximum height of the first surface 161. The maximum height of the first surface 161 refers to the maximum distance between the end of the second surface 162 away from the first wall 12 and the inner surface of the first wall 12. The height of the bump 122 is the distance between the end of the bump 122 away from the first wall 12 and the inner surface of the first wall 12. In this example, the height of the bump 122 is not less than the maximum height of the first surface 161, so that the bump 122 can block between the electrode assembly 15 and the first wall 12, so that the electrode assembly 15 will not squeeze the pressure relief mechanism 16, so as to improve the pressure relief performance of the pressure relief mechanism 16.

[0084] Please refer to Figure 4, in some examples, the housing 11 further includes a second wall 13 connected to the first wall 12, and the second wall 13 is disposed at an angle with the first wall 12; a chamfer 14 is provided at the connection between the first wall 12 and the second wall 13, and the distance between the end of the convex block 122 away from the first wall 12 and the first wall 12 is not less than the distance between the end of the chamfer 14 away from the first wall 12 and the first wall 12.

[0085] The first wall 12 and the second wall 13 are two adjacent wall surfaces on the housing 11. Taking the first wall 12 as the top wall as an example, the second wall 13 can be the side wall of the housing 11. The first wall 12 and the second wall 13 being disposed at an angle means that the first wall 12 and the second wall 13 are not parallel. In this example, it is assumed that the first wall 12 and the second wall 13 are perpendicularly disposed, and a chamfer 14 is formed at the connection between the first wall 12 and the second wall 13 to make the connection between the first wall 12 and the second wall 13 have a smooth transition. The distance between the end of the convex block 122 away from the first wall 12 and the first wall 12 can be the first distance, and the distance between the end of the chamfer 14 away from the first wall 12 and the first wall 12 can be the second distance, and the first distance is greater than the second distance. In this example, when the electrode assembly 15 is supported by the convex block 122, by making the first distance greater than the second distance, the electrode assembly 15 can be prevented from contacting the chamfer 14 area, thereby reducing the problem of damage to the electrode assembly 15.

[0086] The convex block 122 in this example can be used to prevent the electrode assembly 15 from contacting the chamfer 14 area. The convex block 122 can be used as the bottom support plate inside the battery cell 10. On the one hand, it can reduce the structural complexity inside the battery cell 10. On the other hand, it can reduce the use of the bottom support plate and the occupation of the internal space of the housing 11 by the bottom support structure, thereby helping to increase the area of the electrode assembly 15.

[0087] Please refer to Figure 10 and Figure 11 , in some examples, a part of the first wall 12 is recessed inwardly towards the inside of the housing 11, and the concave part of the first wall 12 can integrally form the convex block 122. Scratches can be formed on the concave part of the first wall 12 for pressure relief, and the first distance is greater than the second distance. The bent part of the concave part on the first wall 12 can form the wrinkled part 121. During the use of the battery cell 10, the edge of the concave part can be used to form a space for air flow.

[0088] Please refer to Figure 12 and Figure 13, in some examples, the number of bumps 122 is multiple, and at least two bumps 122 are respectively arranged on both sides of the mounting hole 17 along the length direction of the first wall 12. In this example, the bumps 122 are respectively arranged at the positions on both sides of the mounting shell along the length direction of the first wall 12, so that the bumps 122 can play a supporting role on both sides of the mounting shell along the length direction of the first wall 12. On the one hand, it can reduce the direct contact between the electrode assembly 15 and the pressure relief mechanism 16, and on the other hand, it can disperse the force and reduce the deformation problem caused by uneven local stress. In this example, the bumps 122 can also be arranged at other positions on the first wall 12, and a supporting structure can be formed by multiple bumps 122.

[0089] In some examples, in the vertical projection of the bump 122 on the first wall 12, at least part of the bumps 122 are arranged in a strip shape; wherein, the length direction of at least part of the bumps 122 is parallel to the length direction of the first wall 12; the bump 122 being in a strip shape means that in the vertical projection of the bump 122 on the first wall 12, the whole bump 122 is in a long strip shape. In this example, by setting the bump 122 in a strip shape, the surface area of the bump 122 can be increased, which helps to improve the stability of the electrode assembly 15. The length direction of the bump 122 being parallel to the length direction of the first wall 12 means that the length direction of the bump 122 extends along the length direction of the first wall 12. On the one hand, it can make the bump 122 adapt to the length direction of the electrode assembly 15 and enhance the supporting effect of the bump 122 on the electrode assembly 15. On the other hand, the airflow in the battery cell 10 can move along the length direction of the bump 122 towards the pressure relief mechanism 16, so as to guide the airflow through the side wall of the bump 122 and reduce the problem of excessive local temperature inside the battery cell 10. In this example, multiple groups of bumps 122 can be set, and a channel for gas flow can be formed between adjacent bumps 122 in each group to guide the airflow towards the pressure relief mechanism 16.

[0090] In some examples, different from the previous example, the length direction of at least part of the bumps 122 is arranged at an angle to the length direction of the first wall 12. The length direction of the bump 122 being arranged at an angle to the length direction of the first wall 12 means that the length direction of the bump 122 is not parallel to the length direction of the first wall 12. In this example, by setting the bump 122 with a length direction different from that of the first wall 12, the bump 122 can support the electrode assembly 15 in the width direction to improve the stability of the electrode assembly 15. In this example, the length direction of the bump 122 can be perpendicular to the length direction of the first wall 12.

[0091] In some examples, in the vertical projection of the bump 122 on the first wall 12, at least part of the bump 122 is arranged in a strip shape; wherein, the length direction of at least part of the bump 122 is parallel to the length direction of the first wall 12, and the length direction of at least part of the bump 122 forms an angle with the length direction of the first wall 12. In this example, the bump 122 with different length directions can be matched with the electrode assembly 15. On the one hand, the stability of the electrode assembly 15 can be improved, and on the other hand, the airflow between the electrode assembly 15 and the first wall 12 can be dispersed and guided, further dispersing the airflow and reducing the damage caused by excessive local temperature.

[0092] Please refer to Figure 14 and Figure 15 , in some examples, in the vertical projection of the bump 122 on the first wall 12, at least part of the bump 122 is arranged in a circular shape. In this example, the bump 122 can be a cylindrical convex column arranged on the side of the first wall 12 facing the electrode assembly 15, or a cylindrical convex structure formed by inwards concaving the first wall 12 towards the electrode assembly 15. By adopting the circular bump 122, the forming of the bump 122 can be facilitated.

[0093] In some examples, at least part of the bump 122 is arranged close to the chamfer 14. The bump 122 being arranged close to the chamfer 14 means that the bump 122 is adjacent to the chamfer 14, or the bump 122 extends towards the chamfer 14, so that the supporting surface of the bump 122 for the electrode assembly 15 can extend to the part of the electrode assembly 15 close to the chamfer 14. In this example, there can be a gap between the bump 122 and the chamfer 14 to facilitate the forming of the bump 122.

[0094] Please refer to in combination Figure 16 , in some examples, part of the first wall 12 is concaved inwards towards the electrode assembly 15 to form the bump 122. In this example, the bump 122 and the first wall 12 are integrally arranged to facilitate the forming of the bump 122 and simplify the manufacturing process of the housing 11. Part of the first wall 12 is concaved inwards to form a convex bump 122 protruding towards the electrode assembly 15.

[0095] In some examples, the housing 11 further includes a second wall 13. One end of the second wall 13 is connected to the first wall 12, and the other end extends upwards above the first wall 12. The second wall 13 is a wall surface connected to the first wall 12. In this example, the end of the second wall 13 far from the first wall 12 extends upwards above the first wall 12. The first wall 12 is the bottom wall of the housing 11, and the second wall 13 can be the side wall of the housing 11. An installation hole 17 and a pressure relief mechanism 16 are arranged on the first wall 12 to form a bottom spray structure battery cell 10, so as to reduce the possibility of the pressure relief mechanism 16 impacting other functional components above the battery cell 10 when relieving pressure.

[0096] Please refer toFigure 2 , based on the above battery cell 10, the present application further provides an example of a battery device 100. The battery device 100 includes a box body 20 and the battery cell 10 described in any of the above examples. The battery cell 10 is disposed inside the box body 20. The box body 20 can be used to accommodate the battery cell 10. Optionally, the box body 20 may include a first shell 21 and a second shell 22, and the first shell 21 and the second shell 22 enclose a cavity for accommodating the battery cell 10. The number of battery cells 10 in the battery device 100 can be one or more. When multiple battery cells 10 are provided, the multiple battery cells 10 can be arranged in one row and multiple columns, multiple rows and multiple columns, or an irregular form, and the multiple battery cells 10 can be connected in series, parallel, or series-parallel hybrid.

[0097] Please refer to Figure 1 , the present application further provides an example of an electrical device 1000. The electrical device 1000 includes the battery device 100 described in any of the above examples, and the battery device 100 is used to supply power to the electrical device 1000.

[0098] The electrical device 1000 described in this example can be a vehicle or other devices that require a power source. Taking a vehicle as an example, the vehicle may further include a driving device 200 and a control device 300. The driving device 200 is used to drive the vehicle to move, and the control device 300 is used to control the vehicle. The battery device 100 can be used as the power source of the vehicle, or the battery device 100 can be used to supply power to the electrical appliances on the vehicle. Optionally, the first wall 12 is the bottom wall of the housing 11. By structurally misaligning the corrugated portion 121 and the pressure relief mechanism 16, it can play a role in protecting the pressure relief mechanism 16 from being knocked, and reduce the problem that the bottom pressure relief mechanism 16 of the vehicle is directly damaged due to chassis knocking.

[0099] Please refer to Figures 1 to 16, an example of a battery cell 10 is proposed in this application, which includes a housing 11. The housing 11 includes a first wall 12. An installation hole 17 for installing a pressure relief mechanism 16 is provided on the first wall 12. A wrinkled portion 121 is provided at a position adjacent to the installation hole 17 on the first wall 12. The wrinkled portion 121 may be a regular or irregular structure formed by inwards concaving the first wall 12 towards the inner side of the housing 11. Taking the wrinkled portion 121 as a regular-shaped sink as an example, the wrinkled portion 121 may be a plurality of sinks arranged at intervals on the outer periphery of the installation hole 17, or the wrinkled portion 121 may also be an annular groove arranged around the outer periphery of the installation hole 17. When a plurality of sinks are provided, the length directions of the plurality of sinks are not parallel, so that the wrinkled portion 121 can be used to buffer the acting forces in different directions. A bump 122 is also provided on the first wall 12. The bump 122 protrudes towards the inner side of the housing 11, so that the bump 122 can be used to form a support between the electrode assembly 15 and the first wall 12, and a channel for gas to flow towards the pressure relief mechanism 16 can be formed between the electrode assembly 15 and the first wall 12. Optionally, the housing 11 has a second wall 13 connected to the first wall 12. The height of the bump 122 may be higher than the height of the chamfer 14 at the connection between the first wall 12 and the second wall 13, so that the bump 122 can block between the electrode assembly 15 and the chamfer 14, reducing the possibility of the electrode assembly 15 directly contacting the chamfer 14. In this example, the shape and installation position of the bump 122 can be determined according to factors such as the shape and size of the housing 11 and the electrode assembly 15, so that the bump 122 can play a supporting and separating role between the first wall 12 and the electrode assembly 15. The function of the bump 122 can be similar to that of a bottom support plate, and the bump 122 can also replace the bottom support plate to reduce the structural complexity of the battery cell 10. The pressure relief mechanism 16 of the battery cell 10 in this application may be in a shape that concaves towards the electrode assembly 15. By adopting the concave design, when the first wall 12 comes into contact with an external object, the direct contact between the external object and the pressure relief mechanism 16 can be reduced, which helps to improve the reliability of the pressure relief mechanism 16. The battery cell 10 described in this application can be used in a battery device 100, and the battery device 100 can be used to provide power for an electrical device 1000, or supply power to electrical components on the electrical device 1000.

[0100] The above are only the implementation manners of this application, and do not limit the patent scope of this application accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of this application, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of this application by the same token.

Claims

1. A battery cell, characterized in that, Comprising: An electrode assembly; A housing that houses the electrode assembly, the housing including a first wall having a mounting hole for mounting a pressure relief mechanism, and a wrinkled portion provided at a portion of the first wall adjacent to the mounting hole; The battery cell further includes a pressure relief mechanism disposed in the mounting hole, the pressure relief mechanism having a first surface and a second surface disposed opposite to each other, the first surface facing the electrode assembly, and the second surface being partially recessed toward the inside of the housing so that the first surface protrudes toward the electrode assembly.

2. The battery cell according to claim 1, wherein, The first wall partially protrudes inwardly toward the inside of the housing to form the wrinkled portion; and / or, the first wall partially protrudes outwardly toward the outside of the housing to form the wrinkled portion.

3. The battery cell according to claim 1, characterized in that, The number of the wrinkled portions is plural, and the plural wrinkled portions are spaced apart.

4. The battery cell according to claim 3, wherein, At least one of the wrinkled portions has a strip-like structure.

5. The battery cell according to claim 4, wherein, At least two of the wrinkled portions are strip-like, and the length directions of at least two of the wrinkled portions are at an angle.

6. The battery cell according to claim 1, characterized in that, The wrinkled portion is annularly disposed along the outer periphery of the mounting hole.

7. The battery cell according to claim 1, characterized in that, The distance between one side of the wrinkled portion adjacent to the mounting hole and the mounting hole is not less than 3 mm and not more than 5 mm.

8. The battery cell according to claim 1, characterized in that A convex block is provided on one side of the first wall facing the electrode assembly.

9. The battery cell according to claim 8, characterized in that, The height of the convex block is not less than the maximum height of the first surface.

10. The battery cell according to claim 8, characterized in that, The housing further includes a second wall connected to the first wall, and the second wall is disposed at an angle to the first wall; A chamfer is provided at the connection between the first wall and the second wall, and the distance between one end of the convex block away from the first wall and the first wall is not less than the distance between one end of the chamfer away from the first wall and the first wall.

11. The battery cell according to claim 8, characterized in that, The number of the convex blocks is plural, and at least two of the convex blocks are respectively disposed on both sides of the mounting hole along the length direction of the first wall.

12. The battery cell according to claim 11, wherein, In the vertical projection of the convex block on the first wall, at least part of the convex block is strip-like. Wherein, the length direction of at least part of the convex block is parallel to the length direction of the first wall; and / or, the length direction of at least part of the convex block is at an angle to the length direction of the first wall.

13. The battery cell according to claim 11, wherein, In the vertical projection of the convex block on the first wall, at least part of the convex block is circular.

14. The battery cell according to claim 10, wherein, At least part of the convex block is close to the chamfer.

15. The battery cell according to claim 8, wherein, The first wall partially concaves inwardly toward the electrode assembly to form the convex block.

16. The battery cell according to claim 1, characterized in that, The housing further includes a second wall, one end of the second wall is connected to the first wall, and the other end extends upward above the first wall.

17. A battery device, characterized in that, Comprising: A box body; And The battery cell according to any one of claims 1 to 16, the battery cell being disposed in the box body.

18. An electrical device, characterized in that, Including the battery device according to claim 17, the battery device being used to supply power to the electrical equipment.

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