Battery and electric device

Abstract

A battery (100) and an electric device. The battery (100) comprises battery cells (10) and a separation component (30). Each battery cell (10) has a casing (11). In a first direction (X), the separation component (30) is arranged on one side of a battery cell (10), and the separation component (30) is used for separating the battery cell (10) from another component adjacent to the battery cell (10). In the first direction (X), the casing (11) has a first wall (12) facing the separation component (30). The first wall (12) has a first body portion (120) and a first thickened portion (121) arranged in a second direction (Z), wherein the thickness of the first thickened portion (121) is greater than the thickness of the first body portion (120), and the first direction (X) and the second direction (Z) are perpendicular to each other. In the second direction (Z), the first thickened portion is located on one side of the separation component (30); and in the first direction (X), the first thickened portion (121) protrudes towards the separation component (30) relative to the first body portion (120) and is used for limiting the displacement of the separation component (30) in the second direction (Z). Thus, the reliability of the battery can be improved.

Description

Batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202323136222.X, filed on November 20, 2023, entitled “Battery and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0005] In the development of battery technology, how to improve battery reliability is a technical problem that needs to be solved urgently.

[0006] Summary of the Invention

[0007] The present application provides a battery and an electrical device, and the technical solution provided in the present application can improve the reliability of the battery.

[0008] This application is achieved through the following technical solutions:

[0009] In a first aspect, the present application provides a battery, comprising a battery cell and a separator. The battery cell has an outer shell. Along a first direction, the separator is provided on one side of the battery cell, and the separator is used to separate the battery cell from other components adjacent to the battery cell. Along the first direction, the outer shell has a first wall facing the separator. The first wall has a first main body portion and a first thickened portion arranged along a second direction, the thickness of the first thickened portion is greater than the thickness of the first main body portion, and the first direction and the second direction are perpendicular to each other. Along the second direction, the first thickened portion is located on one side of the separator, and along the first direction, the first thickened portion protrudes toward the separator relative to the first main body portion, and is used to limit the displacement of the separator along the second direction.

[0010] In the above scheme, by providing a thicker and outwardly protruding first thickened portion on the first wall of the shell, on the one hand, the strength of the first wall can be improved, and the problem of the first wall being broken due to the impact of the part not constrained by the partition component can be improved. On the other hand, the outwardly protruding first thickened portion can limit the partition component and limit the displacement of the partition component along the second direction, so that the partition component is in the correct position, reducing the risk of failure of the partition component, and making the battery have higher reliability.

[0011] According to some embodiments of the present application, along the third direction, the first wall has a first side edge and a second side edge that are oppositely disposed, and the third direction, the second direction, and the first direction are mutually perpendicular. Along the third direction, the first thickened portion extends from the first side edge to the second side edge; or, along the third direction, the first thickened portion is located between the first side edge and the second side edge.

[0012] In the above solution, in some embodiments, by arranging the first thickened portion to extend from the first side to the second side, the strength of the first wall can be effectively increased, reducing the risk of the first wall cracking due to impact. In other embodiments, by arranging the first thickened portion to be located between the first side and the second side, the first thickened portion can have a smaller impact on the weight of the first wall while ensuring the first wall has a higher strength, thereby enabling the battery to have a higher gravimetric energy density.

[0013] According to some embodiments of the present application, along the second direction, the housing has a first end wall, the first body portion is farther away from the first end wall than the first thickened portion, the maximum thickness of the first thickened portion is W1, and the maximum thickness of the first end wall is W2, satisfying W1≤W2.

[0014] In the above solution, by limiting the maximum thickness W1 of the first thickened portion to no greater than the maximum thickness W2 of the first end wall, the first thickened portion has a smaller impact on the weight of the battery cell while improving the strength of the first wall, so that the battery has a higher weight energy density.

[0015] According to some embodiments of the present application, the partition component is located between two adjacent battery cells. Along the first direction, the maximum dimension of the first thickened portion protruding from the first main body portion is E, and the maximum thickness of the partition component is W3, satisfying 2*E<W3.

[0016] In the above solution, the partition component is located between the first walls of the two battery cells. By limiting the maximum dimension E of the first thickened portion protruding from the first main body portion to satisfy 2*E<W3, the two first thickened portions can be prevented from interfering with each other, reducing the risk of damage to the outer shell due to mutual interference between the two first thickened portions, and making the battery more reliable.

[0017] According to some embodiments of the present application, the thickness of the first thickened portion gradually increases along the direction from the first body portion to the first thickened portion.

[0018] In the above solution, by setting the thickness of the first thickened portion to gradually increase, it is possible to facilitate the molding of the first thickened portion, reduce the difficulty of molding the first thickened portion, and improve the battery manufacturing efficiency.

[0019] According to some embodiments of the present application, along the second direction, the first wall further has a second thickened portion, the second thickened portion is located on a side of the first main body portion away from the first thickened portion, and the thickness of the second thickened portion is greater than the thickness of the first main body portion.

[0020] In the above solution, by providing a second thickened portion on the side of the first main body away from the first thickened portion, the overall strength of the first wall can be effectively improved, and the impact resistance of the first wall can be improved to effectively reduce the risk of cracking of the shell due to impact, so that the battery has higher reliability.

[0021] According to some embodiments of the present application, along the third direction, the first wall has a first side edge and a second side edge that are oppositely disposed, and the third direction, the second direction, and the first direction are mutually perpendicular. Along the third direction, the second thickened portion extends from the first side edge to the second side edge; or, along the third direction, the second thickened portion is located between the first side edge and the second side edge.

[0022] In the above solution, in some embodiments, by arranging the second thickened portion to extend from the first side to the second side, the strength of the first wall can be effectively increased, reducing the risk of the first wall cracking due to impact. In other embodiments, by arranging the second thickened portion to be located between the first side and the second side, the impact of the second thickened portion on the weight of the first wall can be reduced while improving the strength of the first wall, thereby achieving a higher gravimetric energy density of the battery.

[0023] According to some embodiments of the present application, the thickness of the second thickened portion gradually increases along the direction from the first body portion to the second thickened portion.

[0024] In the above solution, by setting the thickness of the second thickened portion to gradually increase, it is possible to facilitate the molding of the second thickened portion, reduce the difficulty of molding the second thickened portion, and improve the battery manufacturing efficiency.

[0025] According to some embodiments of the present application, the housing includes an end cap and a shell, the shell having a first wall, an opening along the second direction, the first body portion being farther away from the opening than the second thickened portion, and the end cap being welded to the first wall to close the opening.

[0026] In the above solution, the opening of the shell is sealed by an end cap, so that the battery's electrode assembly and electrolyte can be contained in a closed space, reducing the impact of external substances and making the battery more reliable. To improve the manufacturing efficiency of the battery, the end cap can be connected to the shell by welding. However, after the end cap and shell are welded, a heat-affected zone is often formed below the molten pool, which reduces the strength of the shell. Therefore, by providing a second thickened portion to compensate for the strength of the heat-affected zone, the strength of the shell and end cap after welding is higher, reducing or alleviating the risk of cracking and failure at the weld between the end cap and shell, and improving battery reliability.

[0027] According to some embodiments of the present application, the maximum thickness of the second thickened portion is w1, and the thickness of the end cover is w2, satisfying w1≤w2.

[0028] In the above solution, by limiting the maximum thickness w1 of the second thickened portion to no greater than the maximum thickness w2 of the end cover, the second thickened portion has a smaller impact on the weight of the battery cell while improving the strength of the first wall, so that the battery has a higher weight energy density.

[0029] According to some embodiments of the present application, the housing further comprises a second wall along the third direction, the second wall being adjacent to the first wall, the surface area of ​​the first wall being larger than the surface area of ​​the second wall, and the third direction, the second direction, and the first direction being perpendicular to each other. The second wall comprises a second main portion and a third thickened portion arranged along the second direction, the second main portion being further away from the opening than the third thickened portion.

[0030] In the above solution, by providing a third thickened portion at the opening portion of the second wall corresponding to the shell, the third thickened portion cooperates with the second thickened portion to improve the strength of the shell, reduce the risk of the shell cracking due to impact, and improve battery reliability.

[0031] According to some embodiments of the present application, the housing includes two first walls disposed opposite each other along a first direction, and two second walls disposed opposite each other along a third direction, the first walls and the second walls being interconnected and jointly enclosing an opening. Along the circumference of the housing, the second thickened portion and the third thickened portion are interconnected.

[0032] In the above solution, by setting the thickness of the shell corresponding to the opening to be thicker, the strength of the shell can be effectively improved, the risk of shell cracking can be reduced, and the reliability of the battery can be improved.

[0033] According to some embodiments of the present application, along the first direction, the second thickened portion protrudes toward the partition component relative to the first main body portion, and the first thickened portion, the first main body portion and the second thickened portion together form a limiting groove, and the partition component is located in the limiting groove.

[0034] In the above scheme, by setting the second thickened portion to protrude toward the partition component relative to the first main body portion, on the one hand, the strength of the first wall can be improved, and the problem of rupture due to impact of the part not constrained by the partition component can be improved; on the other hand, it plays a limiting role, so that the second thickened portion and the first thickened portion jointly form a limiting groove, which limits the displacement of the partition component along the second direction, so that the partition component is in the correct position, reducing the risk of failure of the partition component, and making the battery have higher reliability.

[0035] According to some embodiments of the present application, the partition component is located between two adjacent battery cells. Along the first direction, the maximum dimension of the second thickened portion protruding from the first body portion is e, and the maximum thickness of the partition component is W3, satisfying 2*e<W3.

[0036] In the above solution, the partition component with a maximum thickness of W3 is located between the first walls of the two battery cells. By limiting the maximum dimension e of the second thickened portion protruding from the first main body portion to satisfy 2*e<W3, the two second thickened portions can be prevented from interfering with each other, reducing the risk of damage to the first wall due to interference between the two second thickened portions, and making the battery more reliable.

[0037] According to some embodiments of the present application, the housing includes a cover and a shell, the first wall is at least a portion of the cover; the shell is formed with an opening, and the cover is connected to the shell and closes the opening.

[0038] In the above scheme, a shell design is provided, which may include a cover and a shell. Through the connection between the cover and the shell, the electrode assembly can be set in a closed space. At the same time, a first thickened portion is provided on the cover, which can improve the strength of the cover and play a role in limiting the displacement of the partition component, so that the battery has higher reliability.

[0039] According to some embodiments of the present application, the separation component includes a thermal management component for regulating the temperature of the battery cell.

[0040] In the above scheme, the separation component may include a thermal management component. While the thermal management component plays the role of separating the battery cells, it can exchange heat with the battery cells through the thermal management component or the medium inside the thermal management component, so that the battery is at a suitable temperature, so that the battery has better performance.

[0041] In a second aspect, some embodiments of the present application provide an electrical device comprising the battery of any one of the first aspects, wherein the battery is used to provide electrical energy.

[0042] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0044] FIG1 is a schematic diagram of a vehicle in some embodiments of the present application;

[0045] FIG2 is a perspective exploded view of a battery in some embodiments of the present application;

[0046] FIG3 is a schematic diagram of a battery cell and a separator in some embodiments of the present application;

[0047] FIG4 is a schematic diagram of the internal structure of a battery cell and a separator in some embodiments of the present application;

[0048] Figure 5 is an enlarged view of point A in Figure 4;

[0049] FIG6 is a schematic diagram of a battery cell in some embodiments of the present application;

[0050] FIG7 is an enlarged view of point B in FIG4 ;

[0051] FIG8 is a schematic diagram of a battery cell in some other embodiments of the present application.

[0052] Icon: 100-battery; 10-battery cell; 11-shell; 110-end cover; 111-shell; 12-first wall; 120-first main body; 121-first thickened portion; 122-second thickened portion; 123-first side; 124-second side; 13-second wall; 130-third thickened portion; 14-first end wall; 15-limiting groove; 16-electrode assembly; 17-electrode terminal; 20-box; 21-first box portion; 22-second box portion; 30-partitioning component; x-first direction; z-second direction; y-third direction; 1000-vehicle; 200-controller; 300-motor. DETAILED DESCRIPTION

[0053] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0055] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0056] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0058] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0059] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0060] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., which are not limited in the embodiments of the present application. Battery cells may be rectangular or in other shapes, etc., which are not limited in the embodiments of the present application. The battery mentioned in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery generally includes a casing for encapsulating one or more battery cells. The casing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0061] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement (e.g., deintercalation) of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector uncoated with the positive active material layer protrudes from the positive current collector coated with the positive active material layer, and the positive current collector uncoated with the positive active material layer serves as the positive tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector uncoated with the negative active material layer protrudes from the negative current collector coated with the negative active material layer, and the negative current collector uncoated with the negative active material layer serves as the negative tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, among others. To ensure that high currents can pass without fusing, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly can be a wound or laminated structure, although the embodiments of the present application are not limited thereto.

[0062] The development of battery technology requires simultaneous consideration of multiple design factors, including performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, battery reliability must be considered. Batteries typically consist of cells and separators. Separators are located to the sides of the cells, separating them from adjacent components. For example, separators can be thermal management components, located between adjacent cells to provide separation and thermal management.

[0063] However, during charging and discharging, the expansion force inside the battery will act on the separator, causing the separator to displace along the surface of the battery cell when it is impacted or when it is subjected to external impact, or even causing the separator to separate from the battery cell, causing the separator to fail, for example, unable to perform the role of separation and thermal management, thereby resulting in low battery reliability.

[0064] In view of this, in order to improve the problem of displacement of the partition component due to impact, some embodiments of the present application provide a battery, which includes a battery cell and a partition component. The battery cell has an outer shell. Along the first direction, the partition component is arranged on one side of the battery cell, and the partition component is used to separate the battery cell and other components adjacent to the battery cell. Along the first direction, the outer shell has a first wall facing the partition component. The first wall has a first main body portion and a first thickened portion arranged along the second direction, the thickness of the first thickened portion is greater than the thickness of the first main body portion, and the first direction and the second direction are perpendicular to each other. Along the second direction, the first thickened portion is located on one side of the partition component, and along the first direction, the first thickened portion protrudes toward the partition component more than the first main body portion, and is used to limit the displacement of the partition component along the second direction.

[0065] In the above scheme, by providing a thicker and outwardly protruding first thickened portion on the first wall of the shell, on the one hand, the strength of the first wall can be improved, and the problem of the first wall being broken due to the impact of the part not constrained by the partition component can be improved. On the other hand, the outwardly protruding first thickened portion can limit the partition component and limit the displacement of the partition component along the second direction, so that the partition component is in the correct position, reducing the risk of failure of the partition component, and making the battery have higher reliability.

[0066] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0067] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include new energy vehicles, which may include pure electric vehicles, hybrid electric vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0068] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle 1000 as an example.

[0069] FIG1 is a schematic diagram of a vehicle 1000 in some embodiments of the present application.

[0070] A controller 200, a motor 300, and a battery 100 may be provided inside the vehicle 1000. The controller 200 is used to control the battery 100 to power the motor 300. For example, the battery 100 may be provided at the bottom, front, or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000 and for the circuit system of the vehicle 1000, for example, for the starting, navigation, and operating power requirements of the vehicle 1000. In another embodiment of the present application, the battery 100 may serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0071] Please refer to Figures 2 to 5. Figure 2 is a three-dimensional exploded view of the battery 100 in some embodiments of the present application, Figure 3 is a schematic diagram of the battery cell 10 and the partition component 30 in some embodiments of the present application, Figure 4 is a schematic diagram of the internal structure of the battery cell 10 and the partition component 30 in some embodiments of the present application, and Figure 5 is an enlarged view of point A in Figure 4.

[0072] The battery 100 includes a battery cell 10 and a partition component 30. The battery cell 10 has a housing 11. Along the first direction x, the partition component 30 is arranged on one side of the battery cell 10, and the partition component 30 is used to separate the battery cell 10 from other components adjacent to the battery cell 10. Along the first direction x, the housing 11 has a first wall 12 facing the partition component 30. The first wall 12 has a first main body portion 120 and a first thickened portion 121 arranged along the second direction z. The thickness of the first thickened portion 121 is greater than the thickness of the first main body portion 120. The first direction x and the second direction z are perpendicular to each other. Along the second direction z, the first thickened portion 121 is located on one side of the partition component 30. Along the first direction x, the first thickened portion 121 protrudes toward the partition component 30 relative to the first main body portion 120, and is used to limit the displacement of the partition component 30 along the second direction z.

[0073] In some embodiments, referring to FIG2 , a battery 100 includes a battery cell 10 and a housing 20 , wherein the battery cell 10 is housed within the housing 20 . The housing 20 is used to provide a storage space for the battery cell 10 , and the housing 20 can have various structures. In some embodiments, the housing 20 can include a first housing portion 21 and a second housing portion 22 , wherein the first housing portion 21 and the second housing portion 22 overlap each other, and the first housing portion 21 and the second housing portion 22 jointly define a storage space for accommodating the battery cell 10 . The second housing portion 22 can be a hollow structure with one end open, and the first housing portion 21 can be a plate-like structure, with the first housing portion 21 overlapping the open side of the second housing portion 22 , so that the first housing portion 21 and the second housing portion 22 jointly define a storage space. The first housing portion 21 and the second housing portion 22 can also be hollow structures with one end open, with the open side of the first housing portion 21 overlapping the open side of the second housing portion 22 . Of course, the box body 20 formed by the first box body portion 21 and the second box body portion 22 can be in various shapes, such as a cylinder, a cuboid, etc.

[0074] In the battery 100 , there may be one or more battery cells 10 , and each battery cell 10 may be fixed to the case 20 via a connector (such as a bolt), or each battery cell 10 may be fixed to the case 20 by bonding.

[0075] In some embodiments, the first direction x may be parallel to the thickness direction of the battery cell 10. In other embodiments, the first direction x may be parallel to the width direction of the battery cell 10. The width direction, thickness direction, and height direction of the battery cell 10 are parallel to each other.

[0076] The separator 30 is a component disposed on the side of the battery cell 10 in the first direction x. In the first direction x, the separator 30 may be located between the battery cell 10 and other components adjacent to the battery cell 10. For example, the separator 30 may be located between the battery cell 10 and the battery cell 10, that is, the "other component" may be another battery cell 10; or, the separator 30 may be located between the battery cell 10 and the wall of the case 20, that is, the "other component" may be the wall of the case 20 of the battery 100; or, the separator 30 may be located between the battery cell 10 and the end plate, which may be part of the structure of the battery module. The battery module may include multiple battery cells 10 and end plates. The end plate is located at the end plate of the multiple battery cells 10 and has the function of fastening the multiple battery cells 10.

[0077] In some embodiments, the separator 30 functions as a separator to provide a more reliable environment for the battery cell 10 and reduce the impact of other adjacent components on the battery cell 10. For example, the separator 30 has insulating properties to insulate the battery cell 10 from other adjacent components. In some embodiments, the separator 30 may be a thermal management component located to the side of the battery cell 10, exchanging heat with the battery cell 10 to regulate the temperature of the battery cell 10. For example, the separator 30 may be a water-cooled plate located to the side of the battery cell 10.

[0078] For example, referring to Figure 3 , the separator 30 is a plate-shaped thermal management component with a cavity inside to accommodate a medium that regulates the temperature of the battery cell 10. In the second direction z, the separator 30 is smaller than the battery cell 10 and can be located between opposite ends of the battery cell 10 in the second direction z. The second direction z is perpendicular to the first direction x and can be the height of the battery 100. In some embodiments, the second direction z can be parallel to the direction of gravity.

[0079] The battery cell 10 includes a housing 11, and the electrode assembly 16 and the electrolyte of the battery cell 10 can be arranged in the housing 11. In some embodiments, the housing 11 may include a shell 111 and an end cap 110, the shell 111 has an opening, the electrode assembly 16 is arranged inside the shell 111, and the end cap 110 is connected to the shell 111 to close the opening, so that the electrode assembly 16 is located in a closed space. In some embodiments, the end cap 110 may be provided with an electrode terminal 17, and the electrode terminal 17 is connected to the electrode tab of the electrode assembly 16 to achieve output and input of current. In some embodiments, the end cap 110 may be provided with an injection hole, and the electrolyte can be injected into the shell 111 through the injection hole. In some embodiments, the end cap 110 can be riveted, welded or screwed to the shell 111.

[0080] The first wall 12 is the wall portion of the housing 11 in the first direction x. The first wall 12 is the wall portion facing the partition member 30. In some embodiments, the first wall 12 is a portion of the peripheral wall of the housing 111. In some embodiments, the housing 111 is square, and its peripheral wall is formed by four side walls, including two side walls with larger areas and two side walls with smaller areas. The first wall 12 may be the side wall with larger areas. In other embodiments, the first wall 12 may also be the side wall with smaller areas of the peripheral wall.

[0081] Along the second direction z, the first wall 12 has a first main body portion 120 and a first thickened portion 121 arranged with each other. The first main body portion 120 is part of the first wall 12, and the first thickened portion 121 is part of the first wall 12. The thickness of the first main body portion 120 is smaller than that of the first thickened portion 121.

[0082] The phrase "along the second direction z, the first thickened portion 121 is located on one side of the partition member 30" can be understood as meaning that, along the first direction x, the projection of the partition member 30 on the first wall 12 does not overlap with the first thickened portion 121. Referring to Figure 5 , the second direction z can be parallel to the direction of gravity, and the first thickened portion 121 can be located below the partition member 30.

[0083] In some embodiments, along the first direction x, a projection of the partition member 30 on the first wall 12 may overlap with the first body portion 120 , that is, the first body portion 120 may be in contact with the partition member 30 .

[0084] The phrase "along the first direction x, the first thickened portion 121 protrudes toward the partition member 30 relative to the first main body 120" can be understood as meaning that the first thickened portion 121 can protrude beyond the outer surface of the first main body 120. When the partition member 30 is in contact with the first main body 120 and is subjected to an external force and tends to displace along the second direction z, the outward protrusion of the first thickened portion 121 can provide support for the partition member 30, thereby limiting its displacement. In some embodiments, the partition member 30 can be connected to the first wall 12, for example, by being bonded to the first main body 120. When the battery 100 is impacted, the partition member 30 tends to displace due to the impact. The support provided by the first thickened portion 121 can limit the position of the partition member 30.

[0085] In some embodiments, the portion of the first thickened portion 121 where the thickness is increased relative to the first main body 120 may entirely protrude from the outer surface of the first main body 120. In other embodiments, the portion of the first thickened portion 121 where the thickness is increased relative to the first main body 120 may partially protrude from the outer surface of the first main body 120, while the remaining portion may protrude from the inner surface of the first main body 120.

[0086] In the above scheme, by providing a first thickened portion 121 that is thicker and protrudes outward on the first wall 12 of the outer shell 11, on the one hand, the strength of the first wall 12 can be improved, and the problem of rupture caused by impact of the part not constrained by the partition component 30 can be improved. On the other hand, the outwardly protruding first thickened portion 121 can limit the support of the partition component 30 and limit the displacement of the partition component 30 along the second direction z, so that the partition component 30 is in the correct position, reducing the risk of failure of the partition component 30, and making the battery 100 have higher reliability.

[0087] According to some embodiments of the present application, please refer to FIG6 , which is a schematic diagram of a battery cell 10 in some embodiments of the present application.

[0088] Along the third direction y, the first wall 12 has a first side 123 and a second side 124 that are opposite each other. The third direction y, the second direction z, and the first direction x are mutually perpendicular. Along the third direction y, the first thickened portion 121 extends from the first side 123 to the second side 124; alternatively, along the third direction y, the first thickened portion 121 is located between the first side 123 and the second side 124.

[0089] The third direction y is perpendicular to the second direction z, and is also perpendicular to the first direction x. In some embodiments, the first direction x is the thickness direction of the battery cell 10, the second direction z is the height direction of the battery cell 10, and the third direction y is the width direction of the battery cell 10.

[0090] The first side edge 123 and the second side edge 124 are two opposing edges of the first wall 12 in the third direction y. The phrase "along the third direction y, the first thickened portion 121 extends from the first side edge 123 to the second side edge 124" can be understood as meaning that the dimensions of the first thickened portion 121 in the third direction y correspond to the dimensions of the first wall 12 in the third direction y.

[0091] “Along the third direction y, the first thickened portion 121 is located between the first side 123 and the second side 124” can be understood as that the size of the first thickened portion 121 in the third direction y is smaller than the size of the first wall 12 in the third direction y. For example, the size of the first thickened portion 121 is smaller, and the end of the first thickened portion 121 has a certain distance from the first side 123 or the second side 124.

[0092] In some embodiments, there may be a plurality of first thickened portions 121 , and the size of each first thickened portion is relatively small, so that the plurality of first thickened portions 121 are spaced apart along the third direction y.

[0093] In the above solution, in some embodiments, by arranging the first thickened portion 121 to extend from the first side 123 to the second side 124, the strength of the first wall 12 can be effectively improved, and the risk of the first wall 12 cracking due to impact can be reduced. In other embodiments, by arranging the first thickened portion 121 to be located between the first side 123 and the second side 124, the first thickened portion 121 can have a smaller impact on the weight of the first wall 12 while ensuring that the first wall 12 has a higher strength, thereby enabling the battery 100 to have a higher weight energy density.

[0094] According to some embodiments of the present application, referring to FIG5 , along the second direction z, the housing 11 has a first end wall 14, and the first body portion 120 is farther away from the first end wall 14 than the first thickened portion 121. The maximum thickness of the first thickened portion 121 is W1, and the maximum thickness of the first end wall 14 is W2, satisfying W1≤W2.

[0095] In some embodiments, the first end wall 14 is the bottom wall of the housing 111, which is disposed opposite the end cap 110 in the second direction z. In some embodiments, the first thickened portion 121 is connected to the first end portion, which may be directly or indirectly connected. For example, the first thickened portion 121 is connected to the first end cap 110 at a corner, and the thickness of the corner portion is less than or equal to the thickness of the first thickened portion 121.

[0096] In some embodiments, the maximum thickness W1 of the first thickened portion 121 does not exceed the maximum thickness W2 of the first end wall 14. For example, the maximum thickness W1 of the first thickened portion 121 may be less than the maximum thickness W2 of the first end wall 14. For another example, the maximum thickness W1 of the first thickened portion 121 may be equal to the maximum thickness W2 of the first end wall 14.

[0097] In some other embodiments, the maximum thickness W1 of the first thickened portion 121 may be greater than the maximum thickness W2 of the first end wall 14 .

[0098] In the above solution, by limiting the maximum thickness W1 of the first thickened portion 121 to no greater than the maximum thickness W2 of the first end wall 14, the first thickened portion 121 has a smaller impact on the weight of the battery cell 10 while improving the strength of the first wall 12, so that the battery 100 has a higher weight energy density.

[0099] According to some embodiments of the present application, referring to FIG. 5 , the partition component 30 is located between two adjacent battery cells 10 . Along the first direction x, the maximum dimension E of the first thickened portion 121 protruding from the first main body portion 120 is, and the maximum thickness of the partition component 30 is W3, satisfying 2*E<W3.

[0100] In some embodiments, the “other components” may be battery cells 10 , that is, the partition component 30 is located between two adjacent battery cells 10 and has the function of separating the two battery cells 10 . The walls of the two battery cells 10 facing the partition component 30 may both be the first wall 12 .

[0101] The first walls 12 of the two battery cells 10 can jointly limit the displacement of the partition component 30 along the second direction z, that is, the first thickened portions 121 of the first walls 12 of the two battery cells 10 protrude toward each other.

[0102] In some embodiments, the separator 30 may be in contact with the first body portion 120 of the first wall 12, allowing the battery cells 10 to be closely attached to the separator 30. For example, the separator 30 may provide thermal management for the battery cells 10. By closely attaching the separator 30 to the first body portion 120, thermal management efficiency may be improved. When the maximum thickness of the separator 30 is W3, the distance between two adjacent battery cells 10 may be W3.

[0103] “The maximum dimension E of the first thickened portion 121 protruding from the first main body 120” can be understood as the maximum dimension E of the first thickened portion 121 protruding from the plane of the outer surface of the partition member 30. “2*E<W3” can be understood as the first thickened portions 121 of two adjacent battery cells 10 do not contact each other.

[0104] In the above scheme, the partition component 30 is located between the first walls 12 of the two battery cells 10. By limiting the maximum dimension E of the first thickened portion 121 protruding from the first main body portion 120 to satisfy 2*E<W3, the two first thickened portions 121 can be prevented from interfering with each other, reducing the risk of damage to the outer shell 11 due to mutual interference between the two first thickened portions 121, so that the battery 100 has higher reliability.

[0105] In other embodiments, the "other components" may be battery cells 10, that is, the partition component 30 is located between two adjacent battery cells 10 and serves to separate the two battery cells 10. The wall portion of one of the two battery cells 10 facing the partition component 30 may be the first wall 12, and the wall portion of the other battery cell 10 facing the partition component 30 may be a conventional structure, that is, a wall portion without the first thickened portion 121.

[0106] According to some embodiments of the present application, referring to FIG. 5 , along the direction from the first body portion 120 to the first thickened portion 121 , the thickness of the first thickened portion 121 gradually increases.

[0107] In some embodiments, the thickness of the first thickened portion 121 increases gradually rather than abruptly, that is, as the direction from the first main body portion 120 to the first thickened portion 121 increases, the wall portion of the shell 111 gradually increases at a position corresponding to the first thickened portion 121 .

[0108] In the above solution, by setting the thickness of the first thickened portion 121 to gradually increase, it is possible to facilitate the molding of the first thickened portion 121 , reduce the difficulty of molding the first thickened portion 121 , and improve the manufacturing efficiency of the battery 100 .

[0109] In some other embodiments, the first thickened portion 121 and the first main body portion 120 are connected to each other, and the thickness of the first thickened portion 121 is steeper than that of the first main body portion 120 .

[0110] According to some embodiments of the present application, please refer to Figures 6 and 7. Figure 7 is an enlarged view of point B in Figure 4.

[0111] Along the second direction z, the first wall 12 further has a second thickened portion 122 . The second thickened portion 122 is located on a side of the first body portion 120 away from the first thickened portion 121 . The thickness of the second thickened portion 122 is greater than that of the first body portion 120 .

[0112] The second thickened portion 122 is located on the first wall 12. Along the second direction z, the second thickened portion 122, the first main body 120, and the first thickened portion 121 may be arranged relative to one another. The thickness of the second thickened portion 122 may be greater than that of the first main body 120. The thickness of the second thickened portion 122 may be equal to, less than, or greater than that of the first thickened portion 121.

[0113] In some embodiments, the portion of the second thickened portion 122 where the thickness is increased relative to the first body portion 120 may entirely protrude from the outer surface of the first body portion 120. In other embodiments, the portion of the second thickened portion 122 where the thickness is increased relative to the first body portion 120 may partially protrude from the outer surface of the first body portion 120, while the remaining portion may protrude from the inner surface of the first body portion 120. In still other embodiments, the portion of the second thickened portion 122 where the thickness is increased relative to the first body portion 120 may entirely protrude from the inner surface of the first body portion 120.

[0114] 7 , the second thickened portion 122 may be located above the partition member 30 . In other embodiments, along the first direction x, the projection of the partition member 30 on the first wall 12 may at least partially overlap with the second thickened portion 122 .

[0115] In the above solution, by providing the second thickened portion 122 on the side of the first main body portion 120 away from the first thickened portion 121, the overall strength of the first wall 12 can be effectively improved, and the impact resistance of the first wall 12 can be improved to effectively reduce the risk of cracking of the outer shell 11 due to impact, so that the battery 100 has higher reliability.

[0116] According to some embodiments of the present application, as shown in FIG6 , along the third direction y, the first wall 12 has a first side 123 and a second side 124 that are oppositely disposed. The third direction y, the second direction z, and the first direction x are mutually perpendicular. Along the third direction y, the second thickened portion 122 extends from the first side 123 to the second side 124; alternatively, along the third direction y, the second thickened portion 122 is located between the first side 123 and the second side 124.

[0117] The third direction y is perpendicular to the second direction z, and is also perpendicular to the first direction x. In some embodiments, the first direction x is the thickness direction of the battery cell 10, the second direction z is the height direction of the battery cell 10, and the third direction y is the width direction of the battery cell 10.

[0118] The first side edge 123 and the second side edge 124 are two opposing edges of the first wall 12 in the third direction y. The phrase "along the third direction y, the second thickened portion 122 extends from the first side edge 123 to the second side edge 124" can be understood as meaning that the dimensions of the second thickened portion 122 in the third direction y correspond to the dimensions of the first wall 12 in the third direction y.

[0119] “Along the third direction y, the second thickened portion 122 is located between the first side 123 and the second side 124” can be understood as that the size of the second thickened portion 122 in the third direction y is smaller than the size of the first wall 12 in the third direction y. For example, the size of the second thickened portion 122 is smaller, and the end of the second thickened portion 122 has a certain distance from the first side 123 or the second side 124.

[0120] In some embodiments, there may be a plurality of second thickened portions 122 , and each second thickened portion has a smaller size, so that the plurality of second thickened portions 122 are spaced apart along the third direction y.

[0121] In the above solution, in some embodiments, by arranging the second thickened portion 122 to extend from the first side 123 to the second side 124, the strength of the first wall 12 can be effectively improved, and the risk of the first wall 12 cracking due to impact can be reduced. In other embodiments, by arranging the second thickened portion 122 to be located between the first side 123 and the second side 124, the effect of the second thickened portion 122 on the weight of the first wall 12 can be reduced while improving the strength of the first wall 12, thereby enabling the battery 100 to have a higher gravimetric energy density.

[0122] According to some embodiments of the present application, referring to FIG. 7 , along the direction from the first body portion 120 to the second thickened portion 122 , the thickness of the second thickened portion 122 gradually increases.

[0123] In some embodiments, the thickness of the second thickened portion 122 increases gradually rather than abruptly, that is, as the direction from the first body portion 120 to the second thickened portion 122 is directed, the wall portion of the shell 111 gradually increases at the position corresponding to the second thickened portion 122 .

[0124] In the above solution, by setting the thickness of the second thickened portion 122 to gradually increase, it is possible to facilitate the molding of the second thickened portion 122 , reduce the difficulty of molding the second thickened portion 122 , and improve the manufacturing efficiency of the battery 100 .

[0125] According to some embodiments of the present application, as shown in Figures 6 and 7 , the housing 11 includes an end cap 110 and a shell 111. The shell 111 has a first wall 12. Along the second direction z, the shell 111 has an opening. The first body portion 120 is farther away from the opening than the second thickened portion 122. The end cap 110 is welded to the first wall 12 to close the opening.

[0126] The first wall 12 is part of the housing 111. In some embodiments, the housing 111 may include a peripheral wall and a bottom wall, with the peripheral wall surrounding the edge of the bottom wall and forming an opening. The end cap 110 is connected to the peripheral wall and seals the opening. The peripheral wall includes a plurality of interconnected side walls, with the first wall 12 being one of the plurality of interconnected side walls. In some embodiments, the peripheral wall and the bottom wall may be integrally formed. In other embodiments, the peripheral wall and the bottom wall may be welded.

[0127] In some embodiments, the second thickened portion 122 is a portion of the structure forming the opening, that is, the edge of the second thickened portion 122 away from the first body portion 120 is the edge of the opening.

[0128] In other embodiments, the second thickened portion 122 is closer to the opening than the first main body portion 120, but the edge of the second thickened portion 122 away from the first main body portion 120 is not the edge of the opening. Exemplarily, the first wall 12 also includes an opening portion, which is connected to the second thickened portion 122, and the opening portion forms part of the opening.

[0129] “The end cover 110 is welded to the first wall 12 ” may mean that the end cover 110 is welded to the first wall 12 . For example, please refer to FIG. 7 , in which the weld mark formed by welding the end cover 110 and the first wall 12 is shown by the mark C.

[0130] In the above solution, the opening of the shell 111 is closed by the end cover 110, so that the electrode assembly 16 and the electrolyte of the battery 100 can be in a closed space, reducing the influence of external substances, so that the battery 100 has higher reliability. In order to improve the manufacturing efficiency of the battery 100, the end cover 110 can be connected to the outer shell 11 by welding. However, after the end cover 110 and the shell 111 are welded, a heat-affected zone that reduces the strength of the shell 111 is often formed under the molten pool. For this reason, a second thickened portion 122 is provided to compensate for the strength of the heat-affected zone, so that the strength of the shell 111 and the end cover 110 after welding is higher, reducing or alleviating the risk of cracking and failure at the welding position between the end cover 110 and the shell 111, and improving the reliability of the battery 100.

[0131] According to some embodiments of the present application, referring to FIG. 7 , the maximum thickness of the second thickened portion 122 is w1 , and the thickness of the end cover 110 is w2 , satisfying w1 ≤ w2 .

[0132] In some embodiments, the maximum thickness w1 of the second thickened portion 122 does not exceed the maximum thickness w2 of the end cap 110. For example, the maximum thickness w1 of the second thickened portion 122 may be less than the maximum thickness w2 of the end cap 110. For another example, the maximum thickness w1 of the second thickened portion 122 may be equal to the maximum thickness w2 of the end cap 110.

[0133] In some other embodiments, the maximum thickness w1 of the second thickened portion 122 may be greater than the maximum thickness w2 of the end cover 110 .

[0134] In the above solution, by limiting the maximum thickness w1 of the second thickened portion 122 to no greater than the maximum thickness w2 of the end cover 110, the second thickened portion 122 has a smaller impact on the weight of the battery cell 10 while improving the strength of the first wall 12, so that the battery 100 has a higher weight energy density.

[0135] According to other embodiments of the present application, please refer to Figure 8, which is a schematic diagram of a battery cell 10 in other embodiments of the present application. Along the third direction y, the housing 11 further comprises a second wall 13, which is adjacent to the first wall 12. The surface area of ​​the first wall 12 is larger than the surface area of ​​the second wall 13. The third direction y, the second direction z, and the first direction x are mutually perpendicular. The second wall 13 comprises a second main body portion and a third thickened portion 130 arranged along the second direction z. The second main body portion is further away from the opening than the third thickened portion 130.

[0136] The third direction y is perpendicular to the second direction z, and is also perpendicular to the first direction x. In some embodiments, the first direction x is the thickness direction of the battery cell 10, the second direction z is the height direction of the battery cell 10, and the third direction y is the width direction of the battery cell 10.

[0137] In some embodiments, the housing 11 includes a shell 111, the shell 111 has a peripheral wall, the peripheral wall includes two first walls 12 arranged opposite to each other along a first direction x, and two second walls 13 arranged opposite to each other along a third direction y, the first wall 12 is adjacent to the second wall 13, and the surface area of ​​the first wall 12 is greater than the area of ​​the second wall 13.

[0138] The second body portion and the third thickened portion 130 are both parts of the second wall 13 , and the thickness of the second body portion is smaller than that of the third thickened portion 130 .

[0139] “The second main body portion is farther away from the opening than the third thickened portion 130” can be understood as, the third thickened portion 130 is a part of the structure forming the opening of the shell 111, that is, the edge of the third thickened portion 130 away from the second main body portion is the edge of the opening; or, it can be understood as, the third thickened portion 130 is closer to the opening than the second main body portion, but the edge of the third thickened portion 130 away from the second main body portion is not the edge of the opening. Exemplarily, the second wall 13 also includes an opening portion, the opening portion is connected to the third thickened portion 130, and the opening portion forms part of the opening.

[0140] In the above solution, by providing a third thickened portion 130 at the opening portion of the second wall 13 corresponding to the shell 111, the third thickened portion 130 cooperates with the second thickened portion 122, which can improve the strength of the shell 111, reduce the risk of the shell 111 being cracked by impact, and improve the reliability of the battery 100.

[0141] According to other embodiments of the present application, as shown in FIG8 , a housing 111 includes two first walls 12 disposed opposite each other along a first direction x, and two second walls 13 disposed opposite each other along a third direction y. The first walls 12 and the second walls 13 are interconnected and together define an opening. Along the circumference of the housing 111, the second thickened portion 122 and the third thickened portion 130 are interconnected.

[0142] The housing 111 can be square in shape. The peripheral walls of the housing 111 include two first walls 12 and two second walls 13. The two first walls 12 are arranged opposite each other along a first direction x, and the two second walls 13 are arranged opposite each other along a third direction y. The two first walls 12 and the two second walls 13 are interconnected and surround the bottom wall of the housing 111. The end walls of the two first walls 12 and the two second walls 13, which are distal to the bottom wall, collectively define an opening.

[0143] “Along the circumference of the shell 111 , the second thickened portion 122 and the third thickened portion 130 are connected to each other” can be understood as that the thickened portion of the circumferential wall of the shell 111 is arranged around the opening.

[0144] In the above solution, by setting the thickness of the shell 111 corresponding to the opening around the shell to be thicker, the strength of the shell 111 can be effectively improved, the risk of cracking of the shell 111 can be reduced, and the reliability of the battery 100 can be improved.

[0145] According to some embodiments of the present application, please refer to Figures 4 and 7. Along the first direction x, the second thickened portion 122 protrudes toward the partition component 30 relative to the first main body portion 120, and the first thickened portion 121, the first main body portion 120 and the second thickened portion 122 jointly form a limiting groove 15, and the partition component 30 is located in the limiting groove 15.

[0146] The phrase "along the first direction x, the second thickened portion 122 protrudes from the first body portion 120 toward the partition member 30" can be understood as meaning that the second thickened portion 122 can protrude beyond the outer surface of the first body portion 120. When the partition member 30 is in contact with the first body portion 120 and is subjected to an external force causing the partition member 30 to displace along the second direction z, the outward protrusion of the second thickened portion 122 can limit the displacement of the partition member 30.

[0147] Referring to Figure 4, the first thickened portion 121, the first main body portion 120 and the second thickened portion 122 respectively protrude from the outer surface of the first main body portion 120 to form a limiting groove 15. The partition component 30 can be located in the limiting groove 15 during assembly, so that the first thickened portion 121 and the second thickened portion 122 respectively limit the partition component 30 on both sides of the partition component 30.

[0148] In the above scheme, by setting the second thickened portion 122 to protrude toward the partition component 30 relative to the first main body portion 120, on the one hand, the strength of the first wall 12 can be improved, and the problem of rupture due to impact of the part not constrained by the partition component 30 can be improved. On the other hand, it plays a limiting role, so that the second thickened portion 122 and the first thickened portion 121 jointly form a limiting groove 15, which limits the displacement of the partition component 30 along the second direction z, so that the partition component 30 is in the correct position, reducing the risk of failure of the partition component 30, and making the battery 100 have higher reliability.

[0149] According to some embodiments of the present application, referring to FIG. 7 , the partition component 30 is located between two adjacent battery cells 10 . Along the first direction x, the maximum dimension of the second thickened portion 122 protruding from the first body portion 120 is e, and the maximum thickness of the partition component 30 is W3, satisfying 2*e<W3.

[0150] In some embodiments, the “other components” may be battery cells 10 , that is, the partition component 30 is located between two adjacent battery cells 10 and has the function of separating the two battery cells 10 . The walls of the two battery cells 10 facing the partition component 30 may both be the first wall 12 .

[0151] The first walls 12 of the two battery cells 10 can jointly limit the displacement of the partition component 30 along the second direction z, that is, the second thickened portions 122 of the first walls 12 of the two battery cells 10 protrude toward each other.

[0152] In some embodiments, the separator 30 may be in contact with the first body portion 120 of the first wall 12, allowing the battery cells 10 to be closely attached to the separator 30. For example, the separator 30 may provide thermal management for the battery cells 10. By closely attaching the separator 30 to the first body portion 120, thermal management efficiency may be improved. When the maximum thickness of the separator 30 is W3, the distance between two adjacent battery cells 10 may be W3.

[0153] The maximum dimension e of the second thickened portion 122 protruding from the first body portion 120 can be understood as the maximum dimension e of the second thickened portion 122 protruding from the plane of the outer surface of the partition member 30. ... second body portion 122 protruding from the second body portion 122 protruding from the second body portion 122 protruding from the second body portion 122 protruding from the second body portion 122 protruding from the second body portion 122 protruding from the second body portion 122 protruding from the second body portion 122 protruding from the second body portion 122 protruding from the second body portion

[0154] In the above scheme, the partition component 30 with a maximum thickness of W3 is located between the first walls 12 of the two battery cells 10. By limiting the maximum dimension e of the second thickened portion 122 protruding from the first main body portion 120 to satisfy 2*e<W3, the two second thickened portions 122 can be prevented from interfering with each other, reducing the risk of damage to the first wall 12 due to interference between the two second thickened portions 122, so that the battery 100 has higher reliability.

[0155] According to some embodiments of the present application, the housing 11 includes a cover and a shell, the first wall 12 is at least a portion of the cover, the shell is formed with an opening, and the cover is connected to the shell and closes the opening.

[0156] In some embodiments, the housing 11 may be composed of a shell and a cover. The shell may be a component with an opening formed in the first direction x, and the cover may be a component connected to the shell and capable of closing the opening.

[0157] In some embodiments, the first wall 12 may be a cover, and in other embodiments, the first wall 12 may be a portion of the cover.

[0158] For example, the housing 11 may have a multi-edge structure and may include a top wall, a bottom wall, a first side wall, a second side wall, and a third side wall and a fourth side wall that are arranged opposite to each other. The top wall, the bottom wall, the second side wall, the third side wall, and the fourth side wall form a shell. The first side wall is a cover, which may be connected to the shell by bonding, welding, or threading. In some embodiments, the cover may be a side wall with a smaller area or a side wall with a larger area.

[0159] In the above scheme, a shell design is provided, and the shell 11 may include a cover and a shell. Through the connection between the cover and the shell, the electrode assembly 16 can be set in a closed space. At the same time, a first thickened portion 121 is provided on the cover, which can improve the strength of the cover and play a role in limiting the displacement of the partition component 30, so that the battery has higher reliability.

[0160] According to some embodiments of the present application, the partition component 30 includes a thermal management component for regulating the temperature of the battery cell 10 .

[0161] The thermal management component can be a component for regulating the temperature of the battery cell 10. For example, as shown in FIG3 , the thermal management component is plate-shaped, and can be a water-cooled plate. In some embodiments, the thermal management component contains a medium that can exchange heat with the battery cell 10 to achieve cooling and heating of the battery cell 10. The medium can be a fluid, such as a flowing gas, liquid, or a gas-liquid mixture. In some embodiments, the thermal management component can directly regulate the temperature of the battery cell 10. For example, the thermal management component can be an electric heating component.

[0162] In the above solution, the separation component 30 may include a thermal management component. While the thermal management component plays the role of separating the battery cells 10, it can also exchange heat with the battery cells 10 through the medium inside the thermal management component, so that the battery 100 is at a suitable temperature, so that the battery 100 has better performance.

[0163] According to some embodiments of the present application, there is provided an electrical device, comprising any one of the batteries 100 provided above, wherein the battery 100 is configured to provide electrical energy.

[0164] According to some embodiments of the present application, a battery 100 is provided, see Figures 3 to 7 .

[0165] The battery 100 includes a battery cell 10 and a separator 30. The separator 30 is disposed on one side of the battery cell 10 along a first direction x. The separator 30 is used to separate the battery cell 10 from other adjacent components. For example, the other components may be battery cells 10, and the separator 30 may be a water-cooled plate. As shown in FIG3 , the separator 30 is located between two adjacent battery cells 10.

[0166] The battery cell 10 has a housing 11, which includes a shell 111 and an end cap 110. Along a first direction x, the shell 111 includes two first walls 12 arranged opposite each other. Along a third direction y, the shell 111 includes two second walls 13 arranged opposite each other. Along a second direction z, the shell 111 has a bottom wall, and the two first walls 12 and the two second walls 13 are arranged around the edge of the bottom wall and together form an opening. The shell 111 is connected to the ends of the first wall 12 and the second wall 13 away from the bottom wall and closes the opening. The shell 111 can be welded to the first wall 12 and the second wall 13. The first direction x, the second direction z, and the third direction y are arranged perpendicular to each other.

[0167] Along the second direction z, the first wall 12 includes a first thickened portion 121, a first main body portion 120, and a second thickened portion 122, which are arranged in a mutually aligned manner. Along the second direction z, the first main body portion 120 is further away from the bottom wall than the first thickened portion 121, and the first body portion is further away from the end cap 110 than the second thickened portion 122. The thickness of the first thickened portion 121 is greater than that of the first main body portion 120, and the thickness of the second thickened portion is greater than that of the first main body portion 120.

[0168] By providing the first thickened portion 121 and the second thickened portion 122 with relatively large thicknesses, the strength of the first wall 12 can be increased, and the risk of the first wall 12 being cracked due to impact can be reduced.

[0169] Along the second direction z, the first thickened portion 121 is located on one side of the partition member 30, and the second thickened portion 122 is located on the other side of the partition member 30. The outwardly protruding first thickened portion 121 and second thickened portion 122 can limit the displacement of the partition member 30 along the second direction z, thereby maintaining the partition member 30 in the correct position and reducing the risk of partition failure. For example, the second direction z is parallel to the direction of gravity, the direction from the first body portion 120 toward the first thickened portion 121 is the direction of gravity, and the first thickened portion 121 is located below the partition member 30. When the battery 100 is impacted, causing the partition member 30 to be subjected to forces that tend to displace along the direction of gravity, the first thickened portion 121 can limit the displacement of the partition member 30, thereby reducing the risk of partition member 30 failure and ensuring higher reliability of the battery 100.

[0170] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery, wherein: include: A battery cell having a housing; A partition component, which is disposed on one side of the battery cell along a first direction, and is used to separate the battery cell from other components adjacent to the battery cell; Along the first direction, the shell has a first wall facing the partition component, the first wall has a first main body portion and a first thickened portion arranged along the second direction, the thickness of the first thickened portion is greater than the thickness of the first main body portion, and the first direction and the second direction are perpendicular to each other; along the second direction, the first thickened portion is located on one side of the partition component, and along the first direction, the first thickened portion protrudes toward the partition component more than the first main body portion, and is used to limit the displacement of the partition component along the second direction.

2. The battery according to claim 1, wherein Along the third direction, the first wall has a first side edge and a second side edge that are oppositely arranged, and the third direction, the second direction and the first direction are perpendicular to each other; Along the third direction, the first thickened portion extends from the first side edge to the second side edge; or, along the third direction, the first thickened portion is located between the first side edge and the second side edge.

3. The battery according to claim 1 or 2, wherein: Along the second direction, the housing has a first end wall, and the first body portion is farther away from the first end wall than the first thickened portion; The maximum thickness of the first thickened portion is W1, and the maximum thickness of the first end wall is W2, satisfying W1≤W2.

4. The battery according to any one of claims 1 to 3, wherein: The partition component is located between two adjacent battery cells. Along the first direction, the maximum dimension of the first thickened portion protruding from the first main body portion is E, and the maximum thickness of the partition component is W3, satisfying 2*E<W3.

5. The battery according to any one of claims 1 to 4, wherein: Along the direction from the first body portion to the first thickened portion, the thickness of the first thickened portion gradually increases.

6. The battery according to any one of claims 1 to 5, wherein: Along the second direction, the first wall further has a second thickened portion, the second thickened portion is located on a side of the first main body portion away from the first thickened portion, and the thickness of the second thickened portion is greater than the thickness of the first main body portion.

7. The battery according to claim 6, wherein Along the third direction, the first wall has a first side edge and a second side edge that are oppositely arranged, and the third direction, the second direction and the first direction are perpendicular to each other; Along the third direction, the second thickened portion extends from the first side edge to the second side edge; or, along the third direction, the second thickened portion is located between the first side edge and the second side edge.

8. The battery according to claim 6 or 7, wherein: Along the direction from the first body portion to the second thickened portion, the thickness of the second thickened portion gradually increases.

9. The battery according to any one of claims 6 to 8, wherein: The housing comprises an end cap and a shell, the shell having the first wall; Along the second direction, the shell has an opening, the first body portion is farther away from the opening than the second thickened portion, and the end cover is welded to the first wall and closes the opening.

10. The battery according to claim 9, wherein The maximum thickness of the second thickened portion is w1, and the thickness of the end cover is w2, satisfying w1≤w2.

11. The battery according to claim 9 or 10, wherein: The housing further has a second wall along a third direction, the second wall is adjacent to the first wall, the surface area of ​​the first wall is larger than the surface area of ​​the second wall, and the third direction, the second direction and the first direction are perpendicular to each other; The second wall has a second body portion and a third thickened portion arranged along the second direction, and the second body portion is farther away from the opening than the third thickened portion.

12. The battery according to claim 11, wherein The housing comprises two first walls arranged opposite to each other along the first direction, and two second walls arranged opposite to each other along the third direction, wherein the first walls and the second walls are connected to each other and together form the opening; The second thickened portion and the third thickened portion are connected to each other along the circumferential direction of the housing.

13. The battery according to any one of claims 6 to 12, wherein: Along the first direction, the second thickened portion protrudes toward the partition component more than the first main body portion, and the first thickened portion, the first main body portion and the second thickened portion jointly form a limiting groove, and the partition component is located in the limiting groove.

14. The battery according to claim 13, wherein The partition component is located between two adjacent battery cells. Along the first direction, the maximum dimension of the second thickened portion protruding from the first main body portion is e, and the maximum thickness of the partition component is W3, satisfying 2*e<W3.

15. The battery according to any one of claims 1 to 14, wherein: The housing comprises a cover and a shell, wherein the first wall is at least a part of the cover; The shell is formed with an opening, and the cover is connected to the shell and closes the opening.

16. The battery according to any one of claims 1 to 15, wherein: The partition member includes a thermal management member for regulating the temperature of the battery cells.

17. An electrical device, wherein: A battery comprising any one of claims 1 to 16, wherein the battery is used to provide electrical energy.

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