Battery monomer, battery device and electric equipment

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and electric equipment, and relates to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly and a supporting piece, and the electrode assembly is arranged in the shell and is provided with two first surfaces which are opposite along a first direction; the supporting pieces are located between the electrode assembly and the shell, at least one supporting piece is installed on at least one of the two first surfaces, and the supporting pieces protrude out of the electrode assembly along at least one side of the second direction and / or the third direction. The electrode assembly and the shell are separated through the supporting piece, so that when the shell is subjected to vibration impact or the electrode assembly expands, the part, protruding out of the electrode assembly, of the supporting piece can abut against the shell, the first surface does not make direct contact with the shell, and therefore the electrode assembly is effectively protected; the damage risk of the electrode assembly is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical appliance. Background Technology

[0002] Currently, battery devices are being used more and more widely. Battery devices can be power batteries or energy storage batteries. A battery device may include one or more individual battery cells.

[0003] Battery devices are easily damaged when subjected to vibration and shock, which affects their safety and reliability. Therefore, reducing the possibility of battery devices being damaged by vibration and shock is a research direction in battery technology. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device that can reduce the possibility of damage to the battery device from vibration and impact.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a housing, an electrode assembly, and a support member. The electrode assembly is housed within the housing and has two first surfaces that are opposite to each other along a first direction, the first direction intersecting the length direction of the electrode assembly. The support member is located between the electrode assembly and the housing, and at least one of the two first surfaces is mounted with at least one of the support members. The support member protrudes from at least one side of the electrode assembly along a second direction and / or a third direction, the third direction being the length direction of the electrode assembly. The first direction, the second direction, and the third direction intersect each other.

[0006] By employing the above technical solution, the electrode assembly is separated from the housing by a support member. This ensures that when the housing is subjected to vibration or impact, or when the electrode assembly expands, the support member contacts the housing, preventing direct contact between the first surface and the housing. This effectively protects the first surface of the electrode assembly, reducing the risk of damage and extending its service life. Furthermore, designing the support member to protrude from the electrode assembly on at least one side along the second direction, with the protruding portion abutting against the housing, protects both surfaces of the electrode assembly along the second direction. This creates a gap between the second-direction surfaces of the electrode assembly and the housing, reducing the likelihood of damage caused by collision between the second-direction surfaces of the electrode assembly and the housing when the battery cell vibrates or expands. Similarly, designing the support member to protrude from the electrode assembly on at least one side along a third direction, creating a gap between the third-direction surfaces of the electrode assembly and the housing, further reduces the likelihood of damage caused by collision between the third-direction surfaces of the electrode assembly and the housing when the battery cell vibrates or expands.

[0007] In some embodiments of this application, the first surface is the surface with the largest area of ​​the electrode assembly.

[0008] By adopting the above technical solution, a support is installed on the first surface with the largest area of ​​the electrode assembly. Compared with the method of installing support on other surfaces, a larger area of ​​the electrode assembly can be supported and protected.

[0009] In some embodiments of this application, the support located on the first surface covers all areas of the first surface.

[0010] By adopting the above technical solution, the support is designed to cover the first surface, so that all areas of the first surface can be protected by the support, thereby improving the protection effect on the first surface.

[0011] In some embodiments of this application, along the second direction, the difference between the size of the support member and the size of the electrode assembly is greater than 0 mm and less than or equal to 16 mm.

[0012] By adopting the above technical solution, the difference between the dimension of the support member along the second direction and the dimension of the electrode assembly along the second direction is designed to be greater than 0 mm and less than or equal to 16 mm. This ensures that the protruding dimension of the support member can meet the support requirements, and the size of the support member is not too large, thus increasing the volume of the battery cell.

[0013] In some embodiments of this application, the difference between the size of the support member and the size of the electrode assembly along the second direction is greater than or equal to 2 mm and less than or equal to 6 mm.

[0014] By adopting the above technical solution, the protruding size of the support component can meet the support requirements without excessively increasing the volume of the battery cell, thereby affecting the energy density of the battery.

[0015] In some embodiments of this application, along the third direction, the difference between the size of the support member and the size of the electrode assembly is greater than 0 mm and less than or equal to 10 mm.

[0016] By adopting the above technical solution, the protruding size of the support component can meet the support requirements, and the size of the support component will not be too large, thus increasing the volume of the battery cell.

[0017] In some embodiments of this application, along the third direction, the difference between the size of the support and the size of the electrode assembly is greater than or equal to 1 mm and less than or equal to 3 mm.

[0018] By adopting the above technical solution, the protruding size of the support component can meet the support requirements without excessively increasing the volume of the battery cell, thereby affecting the energy density of the battery.

[0019] In some embodiments of this application, the dimension of the support member along the first direction is its thickness, and the portion of the support member protruding from the electrode assembly has an unequal thickness structure.

[0020] By adopting the above technical solution, the part of the support protruding from the electrode assembly is designed as a structure with unequal thickness, which can improve the impact resistance of the part of the support protruding from the electrode assembly.

[0021] In some embodiments of this application, the dimensions of the support member are larger than the dimensions of the electrode assembly along the second direction and the third direction, respectively, and the portion of the support member protruding from the electrode assembly is provided with a corner, which is a chamfered structure.

[0022] The above technical solution provides a chamfered corner on the part of the support protruding from the electrode assembly. The chamfer can reduce the impact with the casing when the battery cell collides, thereby further improving the impact resistance of the support.

[0023] In some embodiments of this application, the support member has a connecting surface facing the first surface, the connecting surface being fitted to and integrally connected with the first surface.

[0024] By adopting the above technical solution, the connection surface of the support is designed to fit and be integrally connected with the first surface, which can improve the connection stability between the two.

[0025] In some embodiments of this application, the integral connection method includes adhesive bonding or thermal fusion bonding.

[0026] By adopting the above technical solution, the connecting surface is designed to be bonded or heat-fused to the first surface, which is convenient to process and has good connection stability.

[0027] In some embodiments of this application, the battery cell further includes an end cap, at least one of the two ends of the housing being open along the length of the electrode assembly, the end cap being connected to the opening, and the support being connected to the end cap.

[0028] By adopting the above technical solution, the support member is connected to the end cap, so that the support member and the housing form a whole to protect the electrode assembly, thereby reducing the possibility of the electrode assembly shifting inside the housing and reducing the possibility of the electrode assembly colliding with the housing, and further improving the stability of the electrode assembly.

[0029] In some embodiments of this application, the support member is integrally connected to the end cap, and / or the support member and the end cap are connected by a connector.

[0030] By adopting the above technical solution, the support component is integrally connected to the end cap and / or connected through a connector, resulting in a simple structure and convenient processing.

[0031] In some embodiments of this application, the support member is integrally connected to the end cap, and the integral connection method includes adhesive bonding or hot-melt bonding.

[0032] By adopting the above technical solutions, bonding or hot-melt connection can improve the stability of the connection between the support and the end cap.

[0033] In some embodiments of this application, the support member is connected to the end cap via a connector, the connector including a snap fastener.

[0034] The above technical solution allows for a snap-fit ​​connection between the support component and the end cap, offering advantages such as convenient assembly and ease of processing.

[0035] In some embodiments of this application, the dimension of the support member along the first direction is 0.1 mm to 5 mm.

[0036] By adopting the above technical solution, the thickness requirements of the support component can be met, which can play a protective role for the electrode assembly.

[0037] In some embodiments of this application, the dimension of the support member along the first direction is 0.5 mm to 2 mm.

[0038] By adopting the above technical solution, the thickness of the support component meets the requirements for protecting and supporting the electrode assembly, and the thickness of the support component is not too large, which would cause the battery cell to become bulky.

[0039] In some embodiments of this application, the support member is an insulating member.

[0040] By adopting the above technical solution, the support component is designed as an insulating component, thereby reducing the impact of the support component design on the performance of the battery cells.

[0041] In some embodiments of this application, the support includes a plastic insulating layer.

[0042] By adopting the above technical solution, the support component is designed to include a plastic insulation layer, and the plastic has good insulation and strength.

[0043] Secondly, embodiments of this application provide a battery device, including a battery housing and a battery cell as described in any of the above technical solutions, wherein the battery cell is installed in the battery housing.

[0044] Thirdly, embodiments of this application provide an electrical device including a battery device as described in any of the above technical solutions, wherein the battery device is used to provide electrical energy. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the structure of an electrical device provided in some embodiments of this application;

[0047] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0048] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0049] Figure 4 Exploded views of a single battery cell provided in some embodiments of this application;

[0050] Figure 5 A schematic diagram of the structure of a battery cell after the electrode assembly and two support members are connected, as provided in some embodiments of this application;

[0051] Figure 6 A schematic diagram of the structure of a battery cell after the electrode assembly and a support member are connected, as provided in some embodiments of this application;

[0052] Figure 7 for Figure 6 Enlarged view of part A;

[0053] Figure 8 This is a side view of a support member for a battery cell provided in some embodiments of this application.

[0054] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0055] 1000, vehicles;

[0056] 100. Battery device;

[0057] 10. Battery housing; 11. First part; 12. Second part;

[0058] 20. Battery cell; 21. Housing; 211. Opening; 22. Electrode assembly; 221. First surface; 222. Second surface; 223. Third surface; 23. Support; 231. Corner; 232. Connecting surface; 233. Plastic insulation layer; 24. End cap; 25. Insulation protection component;

[0059] 200. Controller;

[0060] 300. Motor;

[0061] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0063] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0064] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0065] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0066] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, H and / or B can represent: H existing alone, H and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0067] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0068] In this application, "multiple" means two or more (including two).

[0069] A battery device typically includes a battery housing and individual battery cells located inside the battery housing. Each individual battery cell includes a casing and an electrode assembly installed inside the casing. Taking a stacked electrode assembly as an example, the electrodes of a stacked electrode assembly are very fragile. When the battery is subjected to vibration and impact, it is easily damaged, which will affect the safety of the battery.

[0070] Therefore, related technologies typically involve adding support structures inside the battery to support the electrode assembly, thereby improving the structural strength and stability of the electrode assembly. These support structures are usually located on both sides of the electrode assembly's width. When the battery is subjected to impact or vibration, although the electrode assembly does not directly contact the aluminum casing, the impact force can still be transmitted to the electrode assembly through the support structure, leading to electrode damage. The protective performance of this type of support structure for the electrode assembly needs improvement.

[0071] Furthermore, to better secure the support structure, small areas of adhesive tape are typically used to bond the support to the electrode assembly. This tape adheres to the larger surface of the electrode assembly along its thickness, resulting in a non-flat surface. When the battery cell expands cyclically and the larger surface presses against the casing, stress concentration occurs at the interface between the adhesive tape and the larger surface, causing cracks in the outer electrode sheets and reducing battery life.

[0072] Therefore, improving the support and protection performance of electrode components, reducing the possibility of battery devices being damaged by vibration and impact, and reducing the possibility of electrode breakage due to stress concentration are important issues in the research and development of battery devices and related components.

[0073] In view of this, this application provides a technical solution that aims to solve the above-mentioned technical problems by installing a support member on a large surface of the electrode assembly along the thickness direction.

[0074] The following is in conjunction with the appendix Figure 1-8 The electrical equipment, battery device 100, and battery cell 20 provided in the embodiments of this application will be described below. For ease of explanation, the electrical equipment is described using a vehicle 1000 as an example.

[0075] Combined with appendix Figure 1As shown in the illustration, this application provides a vehicle 1000, which can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0076] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0077] Combined with appendix Figure 2 As shown in the figure, this application embodiment provides a battery device 100, which includes a battery housing 10 and a battery cell 20, with the battery cell 20 housed within the battery housing 10. The battery housing 10 provides a space for the battery cell 20 and can adopt various structures. In some embodiments, the battery housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 can be a hollow structure with one open end, and the first portion 11 can be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space. Alternatively, the first portion 11 and the second portion 12 can both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the battery housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0078] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the battery casing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the battery casing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0079] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0080] Combined with appendix Figure 3 and 4 As shown, this application provides a battery cell including a housing, an electrode assembly, and a support member. The electrode assembly is installed inside the housing and has two first surfaces that are opposite to each other along a first direction, which intersects the length direction of the electrode assembly. The support member is located between the electrode assembly and the housing. At least one of the two first surfaces is equipped with at least one support member. The support member protrudes from at least one side of the electrode assembly along a second direction and / or a third direction, which is the length direction of the electrode assembly. The first direction, the second direction, and the third direction intersect each other.

[0081] The housing 21 is an assembly used to fit the end cap 24 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22 and other components.

[0082] The housing 21 and the end cap 24 can be separate components. An opening 211 can be provided on the housing 21, and the end cap 24 can be used to close the opening 211 to form the internal environment of the battery cell 20. Alternatively, the end cap 24 and the housing 21 can be integrated.

[0083] The housing 21 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 21 can be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0084] Electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction takes place. The housing 21 may contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode plates, and a separator is usually provided between the positive and negative electrode plates.

[0085] The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly 22, while the portions of the positive and negative electrode plates without active material each constitute a tab. The positive and negative tabs can be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0086] In some embodiments, the first direction X in the figure is the thickness direction of the electrode assembly 22, the second direction Y is the width direction of the electrode assembly 22, and the third direction Z is the length direction of the electrode assembly 22.

[0087] The electrode assembly 22 has two opposite second surfaces 222 along the second direction Y, and two opposite third surfaces 223 (end faces) along the third direction Z.

[0088] In this embodiment, the support member 23 is mounted on the first surface 221. The support member 23 can be mounted on one of the first surfaces 221, or on both first surfaces 221. The number of support members 23 on each first surface 221 can be one or more. When there is only one support member 23 on the first surface 221, the support member 23 can be a plate-like component. When there are multiple support members 23 on the first surface 221, the support member 23 can be a plate-like component or a block-like component. Optional materials for the support member 23 are given below.

[0089] The support member 23 is located between the electrode assembly 22 and the housing 21. In some embodiments, an insulating protective member 25 may also be installed inside the housing 21. The shape of the insulating protective member 25 may be similar to that of the housing 21. The insulating protective member 25 covers the electrode assembly 22 and the support member 23 to improve the insulation between the electrode assembly 22 and the housing 21.

[0090] The support member 23 protrudes from the electrode assembly 22 on at least one side along the second direction Y and / or the third direction Z, including various cases, such as the support member 23 protruding from the electrode assembly 22 on one or both sides along the second direction Y, or the support member 23 not protruding from the electrode assembly 22 on either side along the third direction Z.

[0091] For example, the support member 23 protrudes from the electrode assembly 22 on one or both sides along the third direction Z, while the support member 23 does not protrude from the electrode assembly 22 on either side along the second direction Y.

[0092] For example, the support member 23 protrudes from the electrode assembly 22 on one or both sides along the second direction Y, and the support member 23 protrudes from the electrode assembly 22 on one or both sides along the third direction Z.

[0093] In some embodiments, the support member 23 can be designed to be larger than the size of the electrode assembly 22 along the second direction Y, and the support member 23 can protrude from the electrode assembly 22 on at least one side along the second direction Y. The portion of the support member 23 protruding from the electrode assembly 22 can abut against the housing 21, so that the two second surfaces 222 of the electrode assembly 22 along the second direction Y are spaced from the housing 21, thereby protecting the second surfaces 222 of the electrode assembly 22 along the second direction Y and reducing the possibility of damage caused by the collision between the second surfaces 222 and the housing 21 when the battery cell 20 vibrates or expands.

[0094] Similarly, the support member 23 can be designed to be larger than the size of the electrode assembly 22 along the third direction Z. The support member 23 protrudes from the electrode assembly 22 on at least one side along the third direction Z, so that the two third surfaces 223 of the electrode assembly 22 along the third direction Z are spaced from the housing 21. This reduces the possibility of the third surface 223 of the electrode assembly 22 colliding with the end cap 24 and being damaged when the battery cell 20 vibrates or expands.

[0095] In some examples, the first surface 221 is optionally the surface with the largest area of ​​the electrode assembly 22.

[0096] That is, in this embodiment, the areas of the second surface 222 and the third surface 223 are both smaller than the area of ​​the first surface 221. And in some embodiments, the area of ​​the second surface 222 is larger than the area of ​​the third surface 223.

[0097] Compared to the method of installing a support structure on the second surface 222 in related technologies, this embodiment installs the support member 23 on the first surface 221, thereby protecting the first surface 221, which has the largest area of ​​the electrode assembly 22. The support member 23 separates the first surface 221 from the housing 21. When the housing 21 is subjected to vibration and impact or when the electrode assembly 22 expands, the support member 23 comes into contact with the housing 21, and the first surface 221 does not come into direct contact with the housing 21, thereby effectively protecting the first surface 221. Since the first surface 221 is the large surface of the electrode assembly 22, the stability of the second surface 222 and the third surface 223 can be indirectly improved if the large surface is not damaged.

[0098] In addition, since the first surface 221 does not experience stress concentration due to adhesion to a small area of ​​adhesive tape, the risk of damage to the electrode assembly 22 can be further reduced, thus improving its service life.

[0099] Combined with appendix Figure 5 As shown, in some examples, optionally, the support 23 located on the first surface 221 covers the entire area of ​​the first surface 221.

[0100] Covering the entire area of ​​the first surface 221 means that one or more support members 23 completely cover the first surface 221, so that the first surface 221 has no exposed parts. This structure requires that the size of one support member 23 or the size of a combination of multiple support members 23 on the first surface 221 be greater than or equal to the first surface 221.

[0101] Taking a support member 23 installed on the first surface 221 as an example, the area of ​​the surface of the support member 23 connected to the first surface 221 (the connecting surface 232 below) needs to be greater than or equal to the area of ​​the first surface 221, and along the second direction Y and the third direction Z in the figure, the size of the support member 23 needs to be greater than or equal to the size of the first surface 221 respectively.

[0102] With this structure, all areas of the first surface 221 can be protected by the support member 23, and there is no exposed part of the first surface 221, thereby further reducing the possibility of the first surface 221 coming into contact with the shell 21 and improving the protective effect on the first surface 221.

[0103] Combined with appendix Figure 7 As shown, in some examples, optionally, along the second direction Y, the difference between the size of the support 23 and the size of the electrode assembly 22 is greater than 0 mm and less than or equal to 16 mm.

[0104] Along the second direction Y, the difference between the dimension L1 of the support member 23 and the dimension L2 of the electrode assembly 22 is greater than 0 mm and less than or equal to 16 mm. For example, the difference between L1 and L2 can be 1 mm, 2 mm, 5 mm, 10 mm and 16 mm, etc. This embodiment will not list them one by one.

[0105] When the support member 23 protrudes from both sides of the electrode assembly 22 along the second direction Y, the difference is the sum of the dimensions of the portions of the support member 23 protruding from both sides of the electrode assembly 22 along the second direction Y. When the support member 23 protrudes from one side of the electrode assembly 22 along the second direction Y, the difference is the dimension of the portion of the support member 23 protruding from the electrode assembly 22 along the second direction Y.

[0106] The difference between L1 and the size L2 of the electrode assembly 22 reflects the size of the support member 23 along the second direction Y. The difference between L1 and the size L2 of the electrode assembly 22 should be kept within a reasonable range, such as the range mentioned above. This ensures that the size of the support member 23 along the second direction Y is not too small, so that the second surface 222 and the housing 21 can form an effective gap, and also ensures that the size of the support member 23 is not too large, so as to increase the volume of the battery cell 20.

[0107] In some examples, optionally, the difference between the size of the support member 23 and the size of the electrode assembly 22 along the second direction Y is greater than or equal to 2 mm and less than or equal to 6 mm.

[0108] This embodiment further optimizes the numerical range of the difference between L1 and the size L2 of the electrode assembly 22. The difference between L1 and the size L2 of the electrode assembly 22 is designed to be greater than or equal to 2mm and less than or equal to 6mm. For example, the difference between L1 and the size L2 of the electrode assembly 22 can be 2mm, 3mm, 4mm, 5mm and 6mm, etc. This embodiment will not list them one by one.

[0109] Taking the difference between the size L1 and the size L2 of the electrode assembly 22 as 2mm as an example, when the support member 23 protrudes from both sides of the electrode assembly 22 along the second direction Y, the size of the part of the support member 23 protruding from one side along the second direction Y can be 1mm and the other side can be 1mm, so that the two second surfaces 222 can form a distance of 1mm from the inner wall surface of the housing 21 respectively.

[0110] Taking the difference between L1 and the size L2 of electrode assembly 22 as 6mm as an example, when the support member 23 protrudes from both sides of the electrode assembly 22 along the second direction Y, the size of the part of the support member 23 protruding from one side along the second direction Y can be 3mm and the other side can be 3mm, or the two second surfaces 222 can form a distance of 3mm between themselves and the housing 21.

[0111] By limiting the difference between the dimensions L1 and L2 of the electrode assembly 22 to 2mm to 6mm, the dimension of the support member 23 along the second direction Y can meet the requirement of forming an effective gap between the second surface 222 and the housing 21, without excessively increasing the volume of the battery cell 20, thereby affecting the energy density of the battery.

[0112] In some examples, optionally, along the third direction Z, the difference between the size of the support 23 and the size of the electrode assembly 22 is greater than 0 mm and less than or equal to 10 mm.

[0113] Along the third direction Z, the difference between the dimension L3 of the support member 23 and the dimension L4 of the electrode assembly 22 is greater than 0 mm and less than or equal to 10 mm. For example, along the third direction Z, the difference between the dimension L3 of the support member 23 and the dimension L4 of the electrode assembly 22 can be 1 mm, 2 mm, 4 mm, 6 mm, 8 mm and 10 mm, etc. This embodiment will not list them one by one.

[0114] The purpose of the above is to ensure that the two third surfaces 223 can form a certain distance from their corresponding end caps 24, thereby reducing the possibility of the third surfaces 223 colliding with their corresponding end caps 24. At the same time, it also prevents the support member 23 from increasing the volume of the battery cell 20 due to its excessive size.

[0115] In some examples, optionally, along the third direction Z, the difference between the size of the support 23 and the size of the electrode assembly 22 is greater than or equal to 1 mm and less than or equal to 3 mm.

[0116] This embodiment further optimizes the numerical range of L3 and L4, designing the difference between L3 and L4 to be greater than or equal to 1mm and less than or equal to 3mm. For example, the difference between L3 and L4 can be 1mm, 1.5mm, 2mm, 2.5mm and 3mm, etc., which will not be listed one by one in this embodiment.

[0117] Taking the difference between L3 and L4 as 2mm as an example, when the support member 23 protrudes from both sides of the electrode assembly 22 along the third direction Z, the size of the part of the support member 23 protruding from one side along the second direction Y can be 1mm and the other side can be 1mm, so that the two third surfaces 223 can form a 1mm gap with their corresponding end caps 24.

[0118] Taking the difference between L3 and L4 as 3mm as an example, when the support member 23 protrudes from both sides of the electrode assembly 22 along the third direction Z, the size of the part of the support member 23 protruding from one side along the third direction Z can be 1.5mm and the other side is 3mm, which can also make the two third surfaces 223 form a 1.5mm gap with their corresponding end caps 24.

[0119] By limiting the difference between L3 and L4 to 1m to 3mm, the dimension of the support member 23 along the third direction Z can be such that the third surface 223 can form an effective gap with its corresponding end cap 24, without excessively increasing the volume of the battery cell 20, thereby affecting the energy density of the battery.

[0120] In some examples, the thickness of the support 23 is optionally set along the first direction X, and the portion of the support 23 protruding from the electrode assembly 22 is of unequal thickness.

[0121] The support member 23 can be the plate-shaped member described above, and the thickness of the support member 23 is set along the first direction X in the figure.

[0122] In this embodiment, the portion of the support member 23 protruding from the electrode assembly 22 is designed as a non-uniform thickness structure. The non-uniform thickness structure means that the portion of the support member 23 protruding from the electrode assembly 22 has at least two positions with different thicknesses. That is, the thickness of the portion of the support member 23 protruding from the electrode assembly 22 at one or more locations is different from that of other areas. For example, the thickness of one or more locations may be greater than that of adjacent areas.

[0123] For example, the thickness of the portion of the support 23 that protrudes from the electrode assembly 22 may be gradual, for example, the thickness of the portion gradually increases along the direction away from the electrode assembly 22.

[0124] Unequal thickness structures can effectively mitigate stress concentration. Under stress, thicker areas can withstand greater stress, while thinner areas can bear less load, thus achieving a more uniform stress distribution.

[0125] Furthermore, the unequal thickness structure can provide additional strength and stiffness to the edges of the support 23 to cope with localized loads. For example, thickening the support can increase the load-bearing capacity of these critical areas and improve the impact resistance of the portion of the support 23 that protrudes from the electrode assembly 22.

[0126] Combined again with the appendix Figure 7 As shown, in some examples, optionally, the dimensions of the support member 23 are larger than the dimensions of the electrode assembly 22 along the second direction Y and the third direction Z, respectively. The portion of the support member 23 that protrudes from the electrode assembly 22 is provided with a corner 231, which is a chamfered structure.

[0127] The corner 231 refers to the angle formed by two adjacent sides of the support member 23. Taking the rectangular plate-shaped support member 23 in the figure as an example, the support member 23 has four corners 231.

[0128] The chamfered structure refers to cutting at a certain angle and radius at each corner 231 of the support member 23 to form a smooth transition edge.

[0129] The chamfer design can effectively disperse stress, reduce local stress, thereby improving the overall strength of the material, reducing stress concentration, improving the material's fatigue resistance, and thus extending its service life.

[0130] In addition, the chamfered design can increase the toughness of the support member at corner 231, allowing it to better absorb energy when subjected to impact and prevent brittle fracture.

[0131] Based on the above description of the chamfer, it can be seen that in this embodiment, the corner 231 of the support member 23 is designed to have a chamfer structure. The chamfer can reduce the impact with the housing 21 when the battery cell 20 collides, thereby further improving the impact resistance of the support member 23.

[0132] Combined again with the appendix Figure 4 As shown, in some examples, the support member 23 may optionally have a connecting surface 232 facing the first surface 221, the connecting surface 232 being in contact with and integrally connected to the first surface 221.

[0133] The connecting surface 232 refers to the surface of the support member 23 that faces and connects to the first surface 221. Both the connecting surface and the first surface 221 are planar.

[0134] Integrated connection refers to a connection method in which the support component 23 and the electrode assembly 22 are pre-formed as a whole during the manufacturing process. Integrated connection methods are usually achieved through bonding or thermal fusion.

[0135] The integral connection eliminates the gaps and seams between the connecting surface 232 and the first surface 221. Because there are no welds or connection points, the integral connection gives the support member 23 and the electrode assembly 22 higher overall strength and rigidity, allowing for better stress distribution and improved overall stability when subjected to external loads.

[0136] In some examples, the integral connection may optionally include adhesive bonding or thermal fusion bonding.

[0137] Adhesion refers to bonding the connecting surface 232 and the first surface 221 together with an adhesive, while hot melt bonding refers to heating and melting the connecting surface 232 and then mating it with the first surface 221.

[0138] Of course, the methods of achieving integral connection are not limited to the above-mentioned adhesive and thermofusion connection. For example, integral connection can also be achieved by welding.

[0139] Designing the connecting surface 232 to be bonded or heat-fused to the first surface 221 not only facilitates processing but also ensures good connection stability between the connecting surface 232 and the first surface 221.

[0140] In some examples, the battery cell 20 may optionally include an end cap 24, at least one of the opposite ends of the housing 21 along the length of the electrode assembly 22 having an opening 211, the end cap 24 being connected to the opening 211, and the support member 23 being connected to the end cap 24.

[0141] The structure of the end cap 24 has been described above, and will not be repeated in this embodiment.

[0142] The housing 21 has openings 211 at both ends along the third direction Z, and the end caps 24 are installed at the openings 211. The installation method can be at least one of the following: plug-in, welding, bonding, etc.

[0143] To improve the positional stability of the support member 23 within the housing 21, this embodiment also connects and fixes the support member 23 to the end cap 24.

[0144] The end cap 24 has good stability through its connection with the housing 21. Then, the support member 23 is connected to the relatively stable end cap 24, so that the support member 23, the housing 21 and the end cap 24 form a whole to protect the electrode assembly 22, thereby reducing the possibility of the electrode assembly 22 shifting within the housing 21 and also reducing the possibility of the electrode assembly 22 colliding with the housing 21, further improving the stability of the electrode assembly 22.

[0145] In some examples, the support 23 may be integrally connected to the end cap 24, and / or the support 23 and the end cap 24 may be connected by a connector (not shown).

[0146] The above technical solutions include multiple implementation methods. One method is that the support member 23 and the end cap 24 are connected only by an integral connection. Another method is that the support member 23 and the end cap 24 are connected only by a connector. Yet another method is that the support member 23 and the end cap 24 are integrally connected, and the two are also connected by a connector.

[0147] The support member 23 is integrally connected to the end cap 24 and / or connected by a connector, which has the advantages of simple structure and convenient processing.

[0148] In some examples, optionally in some embodiments of this application, the support member 23 is integrally connected to the end cap 24, and the integral connection method includes adhesive bonding or thermal fusion bonding.

[0149] The bonding and hot-melt bonding methods have been described above, and will not be repeated in this embodiment.

[0150] By bonding or heat-melting the support member 23 to the end cap 24, the stability of the connection between the support member 23 and the end cap 24 can be improved.

[0151] In some examples, the support 23 is optionally connected to the end cap 24 by a connector, which includes a snap fastener (not shown in the figure), wherein one of the support 23 and the end cap 24 is connected by a snap fastener and the other is provided with a slot (not shown in the figure).

[0152] The connector can be fixedly connected to one of the support member 23 and the end cap 24. The other of the support member 23 and the end cap 24 is provided with a slot. After the buckle is engaged with the slot, the support member 23 and the end cap 24 are engaged.

[0153] The support member 23 is snapped together with the end cap 24, which has the advantages of convenient assembly and easy processing.

[0154] Of course, the structure of the connector is not limited to snap-fit; for example, it can also be a bolt, screw, rivet, or other connecting component, all of which can achieve a stable connection between the support 23 and the end cap 24.

[0155] Combined with appendix Figure 8 As shown, in some examples, the dimension of the support member 23 along the first direction X is optionally 0.1 mm to 5 mm.

[0156] The dimension L5 of the support member 23 along the first direction X is the thickness of the support member 23. In this embodiment, the thickness L5 of the support member 23 is optimized and designed to be 0.1mm to 5mm. For example, it can be 0.1mm, 1mm, 2mm, 3.5mm and 5mm, etc. This embodiment will not list them one by one.

[0157] The reason for the above design is that, since the support member 23 serves to protect the electrode assembly 22, it needs to have a certain thickness to ensure its structural strength and stability. However, the thickness of the support member 23 should not be too large, so as not to cause the volume of the battery cell 20 to increase excessively.

[0158] Therefore, in this embodiment, L5 is designed to be 0.1mm to 5mm, which can meet the thickness requirements of the support member 23, protect the electrode assembly 22, and prevent the battery cell 20 from becoming too large.

[0159] In some examples, the dimension of the support member 23 along the first direction X is optionally 0.5 mm to 2 mm.

[0160] Furthermore, in this embodiment, the thickness L5 of the support member 23 is designed to be 0.5mm to 2mm, for example, it can be 0.5mm, 0.8mm, 1.3mm, 1.8mm and 2mm.

[0161] The above numerical range is a further optimization design of the thickness of the support member 23, so that the thickness of the support member 23 meets the requirements for protecting and supporting the electrode assembly 22, providing better protection for the electrode assembly 22, and ensuring that the thickness of the support member 23 is not too large, which would cause the battery cell 20 to be bulky.

[0162] In some examples, support 23 is an insulating element.

[0163] An insulating component refers to a support 23 in which at least a portion is made of insulating material, and the portion of the support 23 that interfaces with the electrode assembly 22 and the housing 21 is made of insulating material.

[0164] For example, an insulating component can be made entirely of insulating material, or it can be an insulating material that encases a conductive material with high structural strength, with the conductive material not exposed.

[0165] The support member 23 is designed as an insulating member to reduce the impact of the design of the support member 23 on the performance of the battery cell 20. For example, it can reduce the possibility of a short circuit between the electrode assembly 22 and the housing 21.

[0166] In some examples, the support 23 may optionally include a plastic insulation layer 233.

[0167] The support member 23 may only have a plastic insulation layer 233, in which case the entire support member 23 is made of plastic. Alternatively, the support member 23 may also include other insulation material layers, such as rubber, silicone, and ceramic materials, which will not be listed in detail in this embodiment.

[0168] The plastic insulation layer 233 can be made of materials such as PP (polypropylene), PE (polyethylene), PET (polyethylene terephthalate), and PC (polycarbonate), etc., which will not be listed one by one in this embodiment.

[0169] Plastic has good insulation and strength, which can ensure the insulation effect while enabling the support member 23 to better protect the electrode assembly 22.

[0170] Of course, the structure of the support member 23 is not limited to this. For example, the support member 23 can be designed to include only a ceramic insulation layer or a rubber insulation layer, or it can be a structure formed by connecting multiple insulation materials in sequence.

[0171] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0172] Please participate in the attached document. Figure 3-8As shown, this application embodiment provides a battery cell 20, including a housing 21, an electrode assembly 22, and a support member 23. The electrode assembly 22 is installed inside the housing 21 and has two first surfaces 221 opposite to each other along a first direction X, which intersects the length direction of the electrode assembly 22. The support member 23 is located between the electrode assembly 22 and the housing 21. At least one of the two first surfaces 221 is equipped with at least one support member 23. The support member 23 protrudes from at least one side of the electrode assembly 22 along a second direction Y and / or a third direction Z, where the third direction Z is the length direction of the electrode assembly 22. The first direction X, the second direction Y, and the third direction Z intersect each other. The first surface 221 is the surface with the largest area of ​​the electrode assembly 22. The support member 23 located on the first surface 221 covers all areas of the first surface 221. Along the second direction Y, the difference between the size of the support member 23 and the size of the electrode assembly 22 is greater than 0 mm and less than or equal to 16 mm. The difference between the size of the support member 23 and the size of the electrode assembly 22 along the second direction Y is greater than or equal to 2 mm and less than or equal to 6 mm. Along the third direction Z, the difference between the size of the support member 23 and the size of the electrode assembly 22 is greater than 0 mm and less than or equal to 10 mm. Along the third direction Z, the difference between the size of the support member 23 and the size of the electrode assembly 22 is greater than or equal to 1 mm and less than or equal to 3 mm. The dimension of the support member 23 along the first direction X is its thickness, and the portion of the support member 23 protruding from the electrode assembly 22 has an unequal thickness structure. Along the second direction Y and the third direction Z, the size of the support member 23 is greater than the size of the electrode assembly 22, and the portion of the support member 23 protruding from the electrode assembly 22 has a chamfered corner 231. The support member 23 has a connecting surface 232 facing the first surface 221, and the connecting surface 232 is in contact with and integrally connected to the first surface 221. The integral connection method includes adhesive bonding or thermal fusion bonding. The battery cell 20 also includes an end cap 24. At least one end of the housing 21, along the length of the electrode assembly 22, has an opening 211. The end cap 24 is connected to the opening 211, and a support member 23 is connected to the end cap 24. The support member 23 is integrally connected to the end cap 24, and / or, the support member 23 and the end cap 24 are connected by a connector. The integral connection between the support member 23 and the end cap 24 includes adhesive bonding or thermal fusion bonding. The connection between the support member 23 and the end cap 24 includes a snap-fit ​​connector. The dimension of the support member 23 along the first direction X is 0.1 mm to 5 mm. The dimension of the support member 23 along the first direction X is 0.5 mm to 2 mm. The support member 23 is an insulating member. The support member 23 includes a plastic insulating layer 233.

[0173] Secondly, this application provides a battery device 100, including a battery housing 10 and a battery cell 20 as described above, wherein the battery cell 20 is installed inside the battery housing 10.

[0174] Thirdly, embodiments of this application provide an electrical device including the battery device 100 of the above-described technical solution, the battery device 100 being used to provide electrical energy.

[0175] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for the intermediate technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, include: case; An electrode assembly is mounted inside the housing and has two first surfaces that are opposite to each other along a first direction, the first direction intersecting the length direction of the electrode assembly; as well as A support member is located between the electrode assembly and the housing. At least one of the two first surfaces is equipped with the support member. The support member protrudes from at least one side of the electrode assembly along a second direction and / or a third direction, where the third direction is the length direction of the electrode assembly. The first direction, the second direction, and the third direction intersect each other.

2. The battery cell according to claim 1, characterized in that, The first surface is the surface with the largest area of ​​the electrode assembly.

3. The battery cell according to claim 2, characterized in that, The support located on the first surface covers all areas of the first surface.

4. The battery cell according to claim 3, characterized in that, Along the second direction, the difference between the size of the support member and the size of the electrode assembly is greater than 0 mm and less than or equal to 16 mm.

5. The battery cell according to claim 4, characterized in that, Along the second direction, the difference between the size of the support member and the size of the electrode assembly is greater than or equal to 2 mm and less than or equal to 6 mm.

6. The battery cell according to claim 3, characterized in that, Along the third direction, the difference between the size of the support member and the size of the electrode assembly is greater than 0 mm and less than or equal to 10 mm.

7. The battery cell according to claim 6, characterized in that, Along the third direction, the difference between the size of the support member and the size of the electrode assembly is greater than or equal to 1 mm and less than or equal to 3 mm.

8. The battery cell according to any one of claims 1-7, characterized in that, The dimension of the support member along the first direction is its thickness, and the portion of the support member protruding from the electrode assembly has an unequal thickness structure.

9. The battery cell according to any one of claims 1-7, characterized in that, Along the second direction and the third direction, the size of the support member is larger than the size of the electrode assembly, and the portion of the support member protruding from the electrode assembly has a corner, which is a chamfered structure.

10. The battery cell according to any one of claims 1-7, characterized in that, The support member has a connecting surface facing the first surface, and the connecting surface is in contact with and integrally connected to the first surface.

11. The battery cell according to claim 10, characterized in that, The integral connection method includes adhesive bonding or thermal fusion bonding.

12. The battery cell according to any one of claims 1-7, characterized in that, The battery cell also includes an end cap, and at least one of the two ends of the housing along the length direction of the electrode assembly is provided with an opening. The end cap is connected to the opening, and the support is connected to the end cap.

13. The battery cell according to claim 12, characterized in that, The support member is integrally connected to the end cap, and / or the support member and the end cap are connected by a connector.

14. The battery cell according to claim 13, characterized in that, The support member is integrally connected to the end cap, and the integral connection method includes adhesive bonding or hot-melt bonding.

15. The battery cell according to claim 13, characterized in that, The support member is connected to the end cap via a connector, which includes a buckle.

16. The battery cell according to any one of claims 1-7, characterized in that, The dimension of the support member along the first direction is 0.1 mm to 5 mm.

17. The battery cell according to claim 16, characterized in that, The dimension of the support member along the first direction is 0.5 mm to 2 mm.

18. The battery cell according to any one of claims 1-7, characterized in that, The support component is an insulating component.

19. The battery cell according to claim 18, characterized in that, The support includes a plastic insulation layer.

20. A battery device, characterized in that, It includes a battery housing and a battery cell as described in any one of claims 1-19, wherein the battery cell is installed in the battery housing.

21. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-19 or a battery device as described in claim 20.

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