Battery and electric device

Abstract

The utility model relates to a battery and an electric device. The battery comprises a first battery cell and a buffer assembly, the first battery cell comprises a first surface perpendicular to a first direction, and the first surface faces another adjacent battery cell; the buffering assembly is arranged on the first surface and comprises a first buffering piece, a second buffering piece, a third buffering piece and a fourth buffering piece which are all in a long strip shape, and the first buffering piece and the second buffering piece are located on the two sides of the central axis, in the second direction, of the first surface correspondingly. The third buffering piece and the fourth buffering piece are located on the two sides of the central axis, in the third direction, of the first surface correspondingly, and the first direction, the second direction and the third direction are perpendicular pairwise. According to the battery provided by the embodiment of the invention, the different buffer pieces are arranged in the different edge areas of the first surface, so that a certain expansion space can be reserved for the battery monomer, and the expansion requirement of the battery monomer is met. And different buffer pieces are independently manufactured, so that the probability of material waste caused by repeated cutting of the buffer pieces can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0002] The battery cells in the battery are usually installed at the bottom of the box by gluing. When applying pressure to the battery cells to improve the connection stability between the battery cells and the box, the glue easily overflows into the gap between two adjacent battery cells. In this way, during the cyclic expansion of the battery cells, the battery cells are unevenly stressed and local lithium deposition occurs.

[0003] In order to improve the local lithium deposition caused by the overflow of glue between two adjacent battery cells, a buffer component is generally arranged between two adjacent battery cells to prevent the glue at the bottom of the box from overflowing between the two adjacent battery cells. Since the current buffer component has a complex structure and a high production cost, a buffer component with low production cost is urgently needed. Utility Model Content

[0004] In view of the above problems, the present application provides a battery and an electrical device, which can improve the problem of high production cost of buffer components in the battery.

[0005] In a first aspect, the present application provides a battery, the battery comprising a first battery cell and a buffer assembly. The first battery cell comprises a first surface perpendicular to a first direction, the first surface facing another adjacent battery cell; the buffer assembly is arranged on the first surface, the buffer assembly comprises a first buffer member, a second buffer member, a third buffer member and a fourth buffer member, all of which are long strips, the first buffer member and the second buffer member are respectively located on both sides of the central axis of the first surface along the second direction, the third buffer member and the fourth buffer member are respectively located on both sides of the central axis of the first surface along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0006] In the technical solution of the embodiment of the present application, different buffer components of the buffer assembly are arranged at different edge regions of the first surface of the battery cell. When the battery cell expands, the central region of the first surface of the battery cell expands to a greater extent than the edge region of the first surface. Therefore, arranging different buffer components at different edge regions of the first surface can reserve a certain expansion space for the battery cell, thereby meeting the expansion requirements of the battery cell.

[0007] In addition, manufacturing different buffer parts separately can reduce the probability of obtaining buffer parts that do not meet actual needs due to centralized preparation of all buffer parts, thereby reducing the probability of material waste caused by repeated cutting of buffer parts, and can save materials required for preparing buffer parts.

[0008] In some embodiments, projections of the first buffer component, the second buffer component, the third buffer component, and the fourth buffer component along the first direction are completely misaligned.

[0009] Because the projections of each buffer component in the first direction do not overlap, after all the buffer components are installed on the first surface, there will be no situation where some parts of two buffer components are stacked together along the first direction. This can reduce the probability that the thickness of the stacked part is thicker than other parts due to the stacking of some parts of the buffer components, thereby causing stress concentration to be generated in the stacked part.

[0010] In some embodiments, the first buffer component, the second buffer component, the third buffer component and the fourth buffer component are spaced apart from each other.

[0011] A distance is reserved between two adjacent buffers, which can be used as an extrusion space when the buffers are squeezed, thereby reducing the probability that some parts of the two adjacent buffers overlap due to extrusion, thereby causing stress concentration and lithium precipitation. In addition, compared with connecting the ends of two adjacent buffers together, the above method can also reduce the amount of materials required to prepare the buffers, thereby reducing the production cost of the buffer assembly.

[0012] In some embodiments, the first battery cell includes an electrode assembly, the electrode assembly includes a pole ear extending along a third direction, the first buffer and the second buffer are arranged parallel to the third direction, and the first buffer and the second buffer are symmetrically distributed relative to the central axis of the first surface along the third direction.

[0013] When the battery cell expands and squeezes the first buffer and the second buffer, because the first buffer and the second buffer are at equal distances from the second central axis in the second direction, the external forces applied by the first buffer and the second buffer to the battery cell are approximately equal. Therefore, the squeezing force from the first buffer and the second buffer on the battery cell is also relatively uniform, thereby reducing the probability of the battery cell being skewed due to uneven force.

[0014] In some embodiments, the first battery cell includes an electrode assembly, the electrode assembly includes a pole ear extending along a third direction, the third buffer and the fourth buffer are arranged parallel to the second direction, and the third buffer and the fourth buffer are symmetrically distributed relative to the central axis of the first surface along the second direction.

[0015] When the battery cell expands and squeezes the third buffer member and the fourth buffer member, because the third buffer member and the fourth buffer member are at equal distances from the first central axis in the third direction, the external forces applied by the third buffer member and the fourth buffer member to the battery cell are approximately equal. Therefore, the battery cell is subjected to relatively uniform squeezing force from the third buffer member and the fourth buffer member, thereby reducing the probability of the battery cell being skewed due to uneven force.

[0016] In some embodiments, the battery includes a carrier plate, the first battery cell includes a second surface adjacent to the first surface, the second surface is connected to the carrier plate by gluing, the carrier plate is perpendicular to the third direction, and the fourth buffer is arranged closer to the carrier plate than the third buffer;

[0017] The maximum distance between the first buffer and the fourth buffer is smaller than the maximum distance between the first buffer and the third buffer, and / or the maximum distance between the second buffer and the fourth buffer is smaller than the maximum distance between the second buffer and the third buffer.

[0018] In this way, the amount of material used to prepare the buffer component can be reduced as much as possible without affecting the use effect of the buffer component.

[0019] In some embodiments, a maximum distance between the first buffer component and the third buffer component along the third direction is less than or equal to 5.5 mm, and / or a maximum distance between the second buffer component and the third buffer component along the third direction is less than or equal to 5.5 mm.

[0020] In this way, the probability of the first buffer member overlapping with the third buffer member, which increases the thickness of the overlapping portion and causes stress concentration to cause local lithium deposition, and the probability of the second buffer member overlapping with the third buffer member, which increases the thickness of the overlapping portion and causes stress concentration to cause local lithium deposition are reduced.

[0021] In some embodiments, the first battery cell includes an electrode assembly, the electrode assembly includes a tab extending along a third direction, the third buffer is disposed closer to the tab than the fourth buffer, and the fourth buffer has greater elasticity than the third buffer.

[0022] The elasticity of the fourth buffer component is greater than that of the third buffer component, so that more buffer space can be provided for the overlapping parts of the pole pieces.

[0023] In some embodiments, the electrode assembly includes a body, the electrode tab protrudes from the body, and the fourth buffer is opposite to at least a portion of the body along a first direction.

[0024] Therefore, the fourth buffer component has a stronger elastic deformation capability, which can provide more buffer space for the electrode assembly, that is, provide more buffer space for the battery cell, and reduce the reaction force exerted by the fourth buffer component on the body.

[0025] In some embodiments, the first battery cell includes an end cover and a shell, the end cover is welded to the shell along a third direction, the third buffer is arranged closer to the end cover than the fourth buffer, and the weld formed by welding the end cover and the shell is completely misaligned with the third buffer.

[0026] When the battery cell expands, the third buffer will not squeeze the weld, which can reduce the probability that the weld is damaged due to long-term squeezing by the expanded third buffer, resulting in cracks between the shell and the end cover, thereby affecting the normal operation of the battery cell.

[0027] In some embodiments, an edge of the first surface along the third direction close to the end cover is a first edge, and the weld is located between the third buffer component and the first edge.

[0028] In this way, not only can the weld be protected from being squeezed when the third buffer member expands, but the probability of the first weld being worn can also be reduced, thereby improving the connection stability between the end cover and the shell.

[0029] In some embodiments, the first battery cell includes an end cover and a shell, the end cover is combined and welded to the shell along a third direction, the third buffer member is arranged closer to the end cover than the fourth buffer member, the edge of the first surface close to the end cover side along the third direction is the first edge, and the maximum distance between the third buffer member and the first edge along the third direction is less than or equal to 1.5 mm.

[0030] Taking into account the assembly tolerance of the third buffer during the assembly process, in order not to affect the normal use of the end cover and the third buffer, the distance between the third buffer and the first edge in the third direction is limited, thereby ensuring the assembly quality of the end cover and the third buffer and the stable operation of the battery cell.

[0031] In some embodiments, the first battery cell includes a first side surface, the first side surface is adjacent to the first surface and is transitionally connected via a rounded curved surface, the second buffer is arranged closer to the first side surface than the first buffer, and the second buffer is spaced apart from the rounded curved surface.

[0032] Therefore, even if a buffer is not provided between the rounded curved surfaces corresponding to two adjacent battery cells, a certain expansion space can be provided for the battery cells. This arrangement can reduce the amount of buffer used and reduce the production cost of the buffer assembly.

[0033] In some embodiments, a maximum distance between the rounded curved surface and the second buffer along the second direction is less than or equal to 1.5 mm.

[0034] Considering the assembly tolerance of the second buffer, for normal use of the second buffer, the distance between the second buffer and the rounded surface in the second direction is limited, thereby ensuring the assembly quality of the second buffer and the stable operation of the battery cell.

[0035] In some embodiments, the first battery cell includes a shell and an electrode assembly, the shell includes a first shell wall perpendicular to the third direction, a support member is arranged between the electrode assembly and the first shell wall, the fourth buffer member is closer to the first shell wall than the third buffer member, and the fourth buffer member is spaced apart from the outer surface of the first shell wall.

[0036] In this way, there is no need to connect the fourth buffer component and the first shell wall together, which can further reduce the amount of buffer components used, thereby reducing the production cost of the buffer assembly.

[0037] In some embodiments, the first battery cell includes a shell and an electrode assembly, the electrode assembly is accommodated in the shell, the shell includes a first shell wall perpendicular to the third direction, and the maximum distance between the fourth buffer and the outer surface of the first shell wall along the third direction is less than or equal to 1.5 mm.

[0038] During the assembly process, taking into account the assembly tolerance of the fourth buffer component, in order not to affect the normal use of the fourth buffer component, the distance between the fourth buffer component and the first shell wall in the third direction can be limited, thereby ensuring the assembly quality of the fourth buffer component and the stable operation of the battery cell.

[0039] In some embodiments, the length of the first buffer along the second direction is a, 3mm≤a≤10mm; and / or,

[0040] The length of the second buffer along the second direction is b, 3mm≤b≤10mm; and / or,

[0041] The length of the third buffer along the third direction is c, 3mm≤c≤8mm; and / or,

[0042] The length of the fourth buffer along the third direction is d, and 3mm≤d≤8mm.

[0043] In this way, by limiting the width range of each buffer component, the processable range of each buffer component can be expanded without affecting the performance of each buffer component, and different buffer components with different widths can be used in combination to adapt to batteries with first surfaces of different sizes, thereby expanding the use range of the buffer assembly.

[0044] In some embodiments, the first buffer component, the second buffer component, the third buffer component and the fourth buffer component are enclosed together to form a closed frame.

[0045] In this way, the connection stability between two adjacent buffer members of the enclosed frame is better, which can improve the connection stability of the entire frame.

[0046] In a second aspect, the present application provides an electrical device, which includes the battery in the above embodiment for providing electrical energy.

[0047] When different buffer components of the buffer assembly in the electric device are arranged at different edge regions of the first surface of the battery cell, when the battery cell expands, the central region of the first surface of the battery cell expands to a greater extent than the edge region of the first surface. Therefore, arranging different buffer components at different edge regions of the first surface can reserve a certain expansion space for the battery cell, thereby meeting the expansion requirements of the battery cell.

[0048] In addition, manufacturing different buffer parts separately can reduce the probability of obtaining buffer parts that do not meet actual needs due to centralized preparation of all buffer parts, thereby reducing the probability of material waste caused by repeated cutting of buffer parts, and can save materials required for preparing buffer parts.

[0049] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0051] Figure 1 is a schematic diagram of the structure of a vehicle according to one or more embodiments.

[0052] Figure 2 is an exploded view of a battery according to one or more embodiments.

[0053] Figure 3 is an exploded view of a battery cell according to one or more embodiments.

[0054] Figure 4 It is a schematic structural diagram of a battery according to one or more embodiments with part of the structure omitted.

[0055] Figure 5 for Figure 4 Schematic diagram of the structure of the battery from another perspective.

[0056] Figure 6 FIG. 1 is a perspective view of a battery cell equipped with a buffer assembly according to one or more embodiments.

[0057] Figure 7 FIG. 1 is a front view of a battery cell equipped with a buffer assembly according to one or more embodiments.

[0058] Figure 8 is a cross-sectional view of a battery cell equipped with a buffer assembly according to one or more embodiments.

[0059] Fig. 9 is a cross-sectional view of a battery cell equipped with a buffer assembly according to one or more embodiments.

[0060] Fig.10 FIG. 1 is a front view of a battery cell equipped with a buffer assembly according to one or more embodiments.

[0061] The reference numerals in the specific implementation manner are as follows:

[0062] 1000. Vehicles;

[0063] 100, battery; 200, controller; 300, motor;

[0064] 10. Box body; 11. First part; 12. Second part; 20. Battery cell; 21. End cover; 21a. Electrode terminal; 22. Shell; 23. Electrode assembly; 24. First surface; 241. First central axis; 242. Second central axis; 25. Second surface; 26. Rounded surface; 27. First shell wall; 28. First side surface; 29. ​​Second side surface; 30. Buffer assembly; 31. First buffer member; 32. Second buffer member; 33. Third buffer member; 34. Fourth buffer member; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0065] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0067] In the description of the embodiments of the present application, if technical terms such as "first" and "second" appear, they 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. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0068] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0069] In the description of the embodiments of the present application, if the term "and / or" appears, it is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, if it appears, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0070] In the description of the embodiments of the present application, if it appears, 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).

[0071] In the description of the embodiments of the present application, if any, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0072] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, if any technical terms such as "installed", "connected", "connected", "fixed" and the like are to be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0073] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0074] During the battery cycle, the battery cells will expand. The expansion of the battery cells is mainly due to the expansion of the electrode assembly. When the electrode assembly expands, it will not only affect the battery cell shell where the electrode assembly is located, but also affect the adjacent battery cells, causing damage or leakage in the battery cell shell, thereby affecting the reliability of the battery cell. Therefore, a buffer assembly is generally set between two adjacent battery cells to reserve expansion space for the battery cells.

[0075] However, the buffer components currently used are usually not only complex in structure, but also need to be cut repeatedly, resulting in waste of materials used to prepare the buffer components and increasing the production cost of the buffer components.

[0076] In order to reduce the production cost of the buffer assembly, the embodiment of the present application provides a battery. Four long buffers are arranged on the first surface of the battery cell facing another battery cell, and the four buffers are divided into two groups, each group includes two buffers, and the two buffers in each group are spaced and distributed in parallel along the same direction, wherein the extension direction of each group of buffers is vertical. In this way, the structure of the buffer assembly is simplified, thereby reducing the production cost of the buffer assembly.

[0077] The battery disclosed in the embodiments of the present application may be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft, and a power supply system of the electrical device having the battery disclosed in the present application may be used.

[0078] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0079] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0080] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0081] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0082] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0083] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0084] Each battery cell 20 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0085] Please refer to Figure 3 , Figure 3 The schematic diagram of the exploded structure of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit constituting the battery 100. Figure 3 The battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23 and other functional components.

[0086] The end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Preferably, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminal 21a can be used to electrically connect with the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 21 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 21, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0087] The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 22 and the end cap 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 21 at the opening. Without limitation, the end cap 21 and the shell 22 can also be integrated. Specifically, the end cap 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the end cap 21 covers the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0088] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the body of the battery cell assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the body or at both ends of the body, respectively. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals 21a to form a current loop.

[0089] The battery provided in the embodiment of the present application is described below in conjunction with a specific embodiment in which the battery cell 20 is a square shell battery cell.

[0090] See also Figures 4 to 6 , an embodiment of the present application provides a battery 100. The battery 100 includes a first battery cell 20 and a buffer assembly 30. The first battery cell 20 includes a first surface 24 perpendicular to a first direction X, and the first surface 24 faces another adjacent battery cell 20; the buffer assembly 30 is arranged on the first surface 24, and the buffer assembly 30 includes a first buffer member 31, a second buffer member 32, a third buffer member 33 and a fourth buffer member 34, all of which are long strips. The first buffer member 31 and the second buffer member 32 are respectively located on both sides of the central axis of the first surface 24 along the second direction Y, and the third buffer member 33 and the fourth buffer member 34 are respectively located on both sides of the central axis of the first surface 24 along the third direction. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0091] The battery 100 generally has a plurality of battery cells 20 distributed in the same direction. The first surface 24 of the battery cell 20 includes a central axis extending along the second direction Y and a central axis along the third direction Z. For ease of distinction, the central axis extending along the second direction Y may be named as a first central axis 241, and the central axis extending along the third direction Z may be named as a second central axis 242.

[0092] It can be understood that, along the third direction Z, the first central axis 241 is equidistant from the two edges of the first surface 24. Along the second direction Y, the first central axis 241 is equidistant from the two edges of the first surface 24.

[0093] The buffer assembly 30 is disposed between two adjacent battery cells 20 to accommodate the gap formed between the two adjacent battery cells 20 and provide a certain expansion space for the battery cells 20 to buffer and reduce shock to the battery cells 20. The four buffer components of the buffer assembly 30 can be enclosed together to form a closed structure or an unclosed structure. When all the buffer components are enclosed to form an unclosed structure, each buffer component is independently arranged.

[0094] It should be noted that the buffer components may be made of the same material, but may have different elastic deformations.

[0095] For example, Figure 4 and Figure 5 As shown, multiple battery cells 20 are distributed along the first direction X, and a buffer assembly 30 can be disposed between two adjacent battery cells 20. The first direction X, the second direction Y, and the third direction Z can be regarded as the thickness direction, length direction, and width direction of the corresponding battery cells 20 in the figure.

[0096] An example is given in which a square-shell battery cell is used as the battery cell 20 , one of the battery cells 20 is a first battery cell 20 , and the buffer assembly 30 is installed on the first battery cell 20 .

[0097] A buffer assembly 30 is disposed on the first surface 24 of the first battery cell 20 . The buffer assembly 30 may be mounted on the first surface 24 by, but is not limited to, bonding.

[0098] like Figure 6 As shown, it is assumed that the first surface 24 has a first central axis 241 extending along the second direction Y and a second central axis 242 extending along the third direction Z. In some examples, the first buffer 31 and the second buffer 32 are distributed on both sides of the second central axis 242 along the second direction Y, and the first buffer 31 and the second buffer 32 are both extended along the third direction Z. The third buffer 33 and the fourth buffer 34 are distributed on both sides of the first central axis 241 along the third direction Z, and the third buffer 33 and the fourth buffer 34 are both extended along the second direction Y.

[0099] In some other examples, the first buffer member 31 and the second buffer member 32 are distributed on both sides of the first central axis 241 along the third direction Z, and the first buffer member 31 and the second buffer member 32 are both extended along the second direction Y. The third buffer member 33 and the fourth buffer member 34 are distributed on both sides of the second central axis 242 along the second direction Y, and the third buffer member 33 and the fourth buffer member 34 are both extended along the third direction Z.

[0100] It can be seen that different buffer components of the buffer assembly 30 are arranged at different edge regions of the first surface 24 of the battery cell 20. When the battery cell 20 expands, the central region of the first surface 24 of the battery cell 20 expands to a greater extent than the edge region of the first surface 24. Therefore, by arranging different buffer components at different edge regions of the first surface 24, a certain expansion space can be reserved for the battery cell 20, thereby meeting the expansion requirements of the battery cell 20.

[0101] In addition, manufacturing different buffer parts separately can reduce the probability of obtaining buffer parts that do not meet actual needs due to centralized preparation of all buffer parts, thereby reducing the probability of material waste caused by repeated cutting of buffer parts, and can save materials required for preparing buffer parts.

[0102] In some embodiments, see Figure 6 and 7 , the projections of the first buffer 31 , the second buffer 32 , the third buffer 33 and the fourth buffer 34 along the first direction X are completely misaligned.

[0103] In other words, the projection profiles of two adjacent buffers in the first direction X are spaced apart by a distance, or are just tangent to each other. For example, the first buffer 31 and the second buffer 32 are closer to the fourth buffer 34 than the third buffer 33, and the first buffer 31 is closer to the first end of the fourth buffer 34 than the second buffer 32. The projection of the first buffer 31 in the first direction X and the projection of the first end of the fourth buffer 34 in the first direction X do not overlap. Naturally, the projection of other parts of the fourth buffer 34 in the first direction X does not overlap with the projection of the first buffer 31 in the first direction X.

[0104] Similarly, the projection of the second buffer member 32 in the first direction X and the projection of the fourth buffer member 34 in the first direction X do not overlap. Similarly, the projections of the buffer members in the first direction X do not overlap.

[0105] Because the projections of each buffer component in the first direction X do not overlap, after all the buffer components are installed on the first surface 24, there will be no situation where some parts of two buffer components are stacked together along the first direction X. This can reduce the probability that the thickness of the stacked part is thicker than other parts due to the stacking of some parts of the buffer components, thereby causing stress concentration to be generated in the stacked part.

[0106] like Figure 7 As shown, in some embodiments, the first buffer member 31 , the second buffer member 32 , the third buffer member 33 and the fourth buffer member 34 are arranged to be spaced apart from each other.

[0107] In other words, projections of the first buffer member 31 , the second buffer member 32 , the third buffer member 33 and the fourth buffer member 34 in the first direction X are all spaced apart from each other.

[0108] For example, Figure 7 As shown, the first buffer 31, the second buffer 32, the third buffer 33 and the fourth buffer 34 are enclosed together to form an unclosed frame. Two adjacent buffers are not connected and are spaced apart by a distance.

[0109] When the battery cell 20 expands and squeezes the buffer, some parts of two adjacent buffers may overlap due to the squeezing force, causing stress concentration at the overlapping parts and thus causing local lithium deposition problems.

[0110] A distance is reserved between two adjacent buffers, which can be used as an extrusion space when the buffers are squeezed, thereby reducing the probability that some parts of the two adjacent buffers overlap due to the extrusion, thereby causing stress concentration and lithium precipitation. In addition, compared with connecting the ends of two adjacent buffers together, the above method can also reduce the amount of materials required to prepare the buffers, thereby reducing the production cost of the buffer assembly 30.

[0111] See also Figure 7 and Figure 8 In some embodiments, the first battery cell 20 includes an electrode assembly 23, the electrode assembly 23 includes a pole ear (not shown in the figure) extending along the third direction Z, the first buffer member 31 and the second buffer member 32 are arranged parallel to the third direction Z, and the first buffer member 31 and the second buffer member 32 are symmetrically distributed relative to the central axis of the first surface 24 along the third direction Z.

[0112] Because the central axis (second central axis 242) of the first surface 24 extending along the third direction Z actually coincides with the central axis of the electrode assembly 23 extending along the third direction Z, the first buffer member 31 and the second buffer member 32 are actually distributed on the two edges of the first surface 24 along the second direction Y, and the first buffer member 31 and the second buffer member 32 are equidistant from the second central axis 242.

[0113] When the battery cell 20 expands and squeezes the first buffer member 31 and the second buffer member 32, because the first buffer member 31 and the second buffer member 32 are at equal distances from the second central axis 242 in the second direction Y, the external forces applied by the first buffer member 31 and the second buffer member 32 to the battery cell 20 are roughly equal. Therefore, the squeezing force from the first buffer member 31 and the second buffer member 32 to the battery cell 20 is also relatively uniform, thereby reducing the probability of the battery cell 20 being skewed due to uneven force.

[0114] Please continue reading Figure 7 In some embodiments, the first battery cell 20 includes an electrode assembly 23, the electrode assembly 23 includes a pole ear extending along the third direction Z, the third buffer member 33 and the fourth buffer member 34 are arranged parallel to the second direction Y, and the third buffer member 33 and the fourth buffer member 34 are symmetrically distributed relative to the central axis of the first surface 24 along the second direction Y.

[0115] Because the central axis (first central axis 241) of the first surface 24 extending along the second direction Y actually coincides with the central axis of the electrode assembly 23 extending along the second direction Y, the third buffer member 33 and the fourth buffer member 34 are actually distributed on the two edges of the first surface 24 along the third direction Z, and the third buffer member 33 and the fourth buffer member 34 are equidistant from the first central axis 241.

[0116] When the battery cell 20 expands and squeezes the third buffer member 33 and the fourth buffer member 34, because the third buffer member 33 and the fourth buffer member 34 are at equal distances from the first central axis 241 in the third direction Z, the external forces applied by the third buffer member 33 and the fourth buffer member 34 to the battery cell 20 are approximately equal. Therefore, the battery cell 20 is subjected to a relatively uniform squeezing force from the third buffer member 33 and the fourth buffer member 34, thereby reducing the probability of the battery cell 20 being skewed due to uneven force.

[0117] See also Figure 7 and Figure 8In some embodiments, the battery 100 includes a supporting plate (not shown in the figure), the first battery cell 20 includes a second surface 25 adjacent to the first surface 24, the second surface 25 is connected to the supporting plate by gluing, the supporting plate is perpendicular to the third direction Z, and the fourth buffer member 34 is arranged closer to the supporting plate than the third buffer member 33; the maximum distance between the first buffer member 31 and the fourth buffer member 34 is smaller than the maximum distance between the first buffer member 31 and the third buffer member 33, and / or the maximum distance between the second buffer member 32 and the fourth buffer member 34 is smaller than the maximum distance between the second buffer member 32 and the third buffer member 33.

[0118] The supporting plate is used to support all battery cells 20. The maximum distance between the first buffer 31 and the fourth buffer 34 can be understood as the size of the gap formed by the two in the third direction Z. The maximum distance between the first buffer 31 and the third buffer 33 can be understood as the size of the gap formed by the two in the third direction Z. The maximum distance between the second buffer 32 and the fourth buffer 34 can be understood as the size of the gap formed by the two in the third direction Z. The maximum distance between the second buffer 32 and the third buffer 33 can be understood as the size of the gap formed by the two in the third direction Z. In different embodiments, the sizes of the gaps formed between different buffers are different.

[0119] In some examples, the maximum distance between the first buffer 31 and the third buffer 33 is less than the maximum distance between the first buffer 31 and the fourth buffer 34, and the maximum distance between other buffers is not specifically defined. In other examples, the maximum distance between the second buffer 32 and the fourth buffer 34 is less than the maximum distance between the second buffer 32 and the third buffer 33, and the maximum distance between other buffers is not specifically defined. In still other examples, the maximum distance between the first buffer 31 and the third buffer 33 is less than the maximum distance between the first buffer 31 and the fourth buffer 34, and the maximum distance between the second buffer 32 and the fourth buffer 34 is less than the maximum distance between the second buffer 32 and the third buffer 33.

[0120] When the first battery cell 20 is glued to the carrier plate and the buffer assembly 30 is assembled on the first surface 24, the space between the fourth buffer member 34 and the carrier plate is actually filled with glue. Because the gap formed between the first buffer member 31 and the fourth buffer member 34 and the gap formed between the second buffer member 32 and the fourth buffer member 34 are small, the glue disposed on the carrier plate can be reduced to directly pass through the gap formed between the first buffer member 31 and the fourth buffer member 34, or the gap formed between the second buffer member 32 and the fourth buffer member 34 to reach between two adjacent battery cells 20, thereby causing stress concentration between two adjacent battery cells 20 and causing local lithium deposition.

[0121] In this way, the amount of material used to prepare the buffer component can be reduced as much as possible without affecting the use effect of the buffer component 30.

[0122] Furthermore, if Figure 7 As shown, in some embodiments, the maximum distance between the first buffer member 31 and the third buffer member 33 along the third direction Z is less than or equal to 5.5 mm, and / or the maximum distance between the second buffer member 32 and the third buffer member 33 along the third direction Z is less than or equal to 5.5 mm.

[0123] For example, in some examples, the maximum distance between the first buffer 31 and the third buffer 33 along the third direction Z is L1, L1 is less than or equal to 5.5 mm, and the maximum distance between other buffers is not specifically limited. In other examples, the maximum distance between the second buffer 32 and the third buffer 33 along the third direction Z is L2, L2 is greater than or equal to 5.5 mm, and the maximum distance between other buffers is not specifically limited. In some other examples, the maximum distance L1 between the first buffer 31 and the third buffer 33 along the third direction Z is less than or equal to 5.5 mm, and the maximum distance L2 between the second buffer 32 and the third buffer 33 along the third direction Z is greater than or equal to 5.5 mm.

[0124] When the first buffer member 31 is mounted on the first surface 24, because the mounting position of the first buffer member 31 and the mounting position of the third buffer member 33 are separated by a distance, the overlap between the first buffer member 31 and the third buffer member 33 can be reduced, resulting in an increase in the thickness of the overlapped portion, leading to stress concentration. Moreover, if the gap formed between the first buffer member 31 and the third buffer member 33 is enlarged, the glue will also overflow from the gap to between two adjacent gaps, resulting in local stress concentration and inducing local lithium deposition.

[0125] Similarly, limiting the gap formed between the second buffer member 32 and the third buffer member 33 along the third direction Z is also to reduce the overlap between the second buffer member 32 and the third buffer member 33, which increases the thickness of the overlapped portion and causes stress concentration. Moreover, if the gap formed between the second buffer member 32 and the third buffer member 33 is enlarged, the glue overflows from the gap to between two adjacent gaps, causing local stress concentration and inducing local lithium deposition.

[0126] See also Figure 7 In some embodiments, the first battery cell 20 includes an electrode assembly 23, the electrode assembly 23 includes a pole ear extending along a third direction Z, the third buffer member 33 is arranged closer to the pole ear than the fourth buffer member 34, and the elasticity of the fourth buffer member 34 is greater than the elasticity of the third buffer member 33.

[0127] The fourth buffer member 34 may be made of a material with a Poisson's ratio greater than 0.45, for example, thermoplastic materials such as rubber, TPU, and TPE.

[0128] Normally, a gap is left at the pole ear, and there is a distance between the pole ear and the pole piece of the electrode assembly 23. The pole piece in a wound state has an overlapping portion, and the overlapping portion and the projection of the fourth buffer 34 in the first direction X at least partially overlap. Because the overlapping portion of the pole piece is more likely to expand, and the fourth buffer 34 is closer to the overlapping portion of the pole piece than the third buffer 33, the expansion space required at the fourth buffer 34 is greater than the expansion space required at the third buffer 33. Therefore, the elasticity of the fourth buffer 34 is greater than the elasticity of the third buffer 33, which can provide more buffer space for the overlapping portion of the pole piece.

[0129] See also Figure 8 In some embodiments, the electrode assembly 23 includes a body, the electrode tab protrudes from the body, and the fourth buffer member 34 is opposite to at least a portion of the body along the first direction X.

[0130] In some examples, the projection of the fourth buffer member 34 in the first direction X completely falls within the projection of the body in the first direction X. In other examples, the projection of the fourth buffer member 34 in the first direction X does not completely fall within the projection of the body in the first direction X.

[0131] When the battery cell 20 expands, the body of the electrode assembly 23 easily expands and squeezes the fourth buffer member 34, causing elastic deformation of the fourth buffer member 34. Therefore, the fourth buffer member 34 has a strong elastic deformation ability, which can provide more buffer space for the electrode assembly 23, that is, the battery cell 20 provides more buffer space, and reduces the reaction force exerted by the fourth buffer member 34 on the body.

[0132] In some embodiments, Figure 8 As shown, the first battery cell 20 includes an end cover 21 and a shell 22. The end cover 21 is welded to the shell 22 along the third direction Z. The third buffer member 33 is arranged closer to the end cover 21 than the fourth buffer member 34. The weld formed by welding the end cover 21 and the shell 22 is completely misaligned with the third buffer member 33.

[0133] During the assembly of the battery cell 20, the components that need to be assembled in the shell 22, such as the electrode assembly 23, can be installed in the shell 22 along the third direction Z, and the end cover 21 can be welded to the shell 22. The end cover 21 and the shell 22 can be welded to form a weld, and the third buffer 33 is arranged close to the end cover 21 and is spaced a distance from the weld.

[0134] In this way, when the battery cell 20 expands, the third buffer member 33 will not squeeze the weld, which can reduce the probability that the weld is damaged due to long-term squeezing by the expanded third buffer member 33, resulting in cracks between the shell 22 and the end cover 21, thereby affecting the normal operation of the battery cell 20.

[0135] Specifically, see Figure 7 and Figure 8 In some embodiments, the edge of the first surface 24 along the third direction Z close to the end cover 21 is a first edge (not shown in the figure), and the weld is located between the third buffer member 33 and the first edge.

[0136] The end cover 21 and the shell 22 are welded together. Compared with setting the weld at the first edge, setting the weld between the third buffer member 33 and the first edge can not only protect the weld from being squeezed when the third buffer member 33 expands, but also reduce the probability of the first weld being worn, thereby improving the connection stability between the end cover 21 and the shell 22.

[0137] In some embodiments, the first battery cell 20 includes an end cover 21 and a shell 22, the end cover 21 is welded to the shell 22 along the third direction Z, the third buffer member 33 is arranged closer to the end cover 21 than the fourth buffer member 34, the edge of the first surface 24 close to the end cover 21 along the third direction Z is the first edge, and the maximum distance between the third buffer member 33 and the first edge along the third direction Z is less than or equal to 1.5 mm.

[0138] For example, in Figure 7 In the example shown, the maximum distance between the third buffer 33 and the first edge along the third direction Z is L3, and L3 is equal to 1.5 mm.

[0139] Taking into account the assembly tolerance of the third buffer member 33 during the assembly process, in order not to affect the normal use of the end cover 21 and the third buffer member 33, the distance between the third buffer member 33 and the first edge in the third direction Z is limited, thereby ensuring the assembly quality of the end cover 21 and the third buffer member 33 and the stable operation of the battery cell 20.

[0140] See also Figure 6 and Fig. 9 In some embodiments, the first battery cell 20 includes a first side surface 28 , which is adjacent to the first surface 24 and transitionally connected to the first surface 24 through a rounded curved surface 26 , and the second buffer member 32 is arranged closer to the first side surface 28 than the first buffer member 31 , and the second buffer member 32 is spaced apart from the rounded curved surface 26 .

[0141] exist Fig. 9In the example shown, the first side surface 28 is connected to the first surface 24 along the second direction Y, and a rounded curved surface 26 is connected therebetween. The second buffer member 32 is disposed on the side of the first surface 24 close to the rounded curved surface 26, and a rounded curved surface 26 is spaced between the second buffer member 32 and the first side surface 28. In this way, when the buffer assembly 30 is not disposed between two adjacent battery cells 20, the rounded curved surfaces 26 corresponding to each battery cell 20 in the two adjacent battery cells 20 are spaced a distance apart. Moreover, the buffer assembly 30 is disposed between the two adjacent battery cells 20, and therefore, the rounded curved surfaces 26 corresponding to the two adjacent battery cells 20 are naturally spaced a distance apart.

[0142] Therefore, even if no buffer is provided between the fillet surfaces 26 corresponding to two adjacent battery cells 20, a certain expansion space can be provided for the battery cells 20. This arrangement can reduce the amount of buffer and reduce the production cost of the buffer assembly 30.

[0143] Specifically, in some embodiments, the maximum distance between the rounded curved surface 26 and the second buffer 32 along the second direction Y is less than or equal to 1.5 mm.

[0144] For example, in Fig.10 In the example shown, the maximum distance between the rounded curved surface 26 and the second buffer 32 along the second direction Y is L4, and L4 is equal to 1.5 mm.

[0145] Considering the assembly tolerance of the second buffer member 32 , for normal use of the second buffer member 32 , the distance between the second buffer member 32 and the rounded surface 26 in the second direction Y is limited, thereby ensuring the assembly quality of the second buffer member 32 and the stable operation of the battery cell 20 .

[0146] Similarly, see Figure 6 , Fig. 9 and Fig.10 The first battery cell 20 further includes a second side surface 29, the first side surface 28 and the second side surface 29 are arranged opposite to each other, the first side surface 28 and the first surface 24 are adjacent and transitionally connected by the rounded curved surface 26. The first buffer 31 is arranged closer to the second side surface 29 than the second buffer 32, and the first buffer 31 and the rounded curved surface 26 are arranged at intervals. The maximum distance between the rounded curved surface 26 and the first buffer 31 along the second direction Y is less than or equal to 1.5 mm.

[0147] Thus, no buffer is required at the rounded curved surface 26 of the first surface 24 of the battery cell 20 near the first buffer 31 and the second buffer 32 , thereby reducing the amount of buffer and the production cost of the buffer assembly 30 .

[0148] like Figure 8As shown, in some embodiments, the first battery cell 20 includes a shell 22 and an electrode assembly 23, the shell 22 includes a first shell wall 27 perpendicular to the third direction Z, a support member (not shown in the figure) is arranged between the electrode assembly 23 and the first shell wall 27, the fourth buffer member 34 is closer to the first shell wall 27 than the third buffer member 33, and the fourth buffer member 34 is spaced apart from the outer surface of the first shell wall 27.

[0149] The support member is used to support the electrode assembly 23. The fourth buffer member 34 is disposed on the first surface 24 of the shell 22 and is disposed close to the first shell wall 27, but the fourth buffer member 34 and the first shell wall 27 are not connected. When the battery 100 assembly expands, it will squeeze the first surface 24 of the shell 22, and will not squeeze the first shell wall 27.

[0150] In this way, there is no need to connect the fourth buffer member 34 and the first shell wall 27 together, which can further reduce the amount of buffer members used, thereby reducing the production cost of the buffer assembly 30 .

[0151] Furthermore, if Figure 7 As shown, in some embodiments, the first battery cell 20 includes a shell 22 and an electrode assembly 23, the electrode assembly 23 is accommodated in the shell 22, the shell 22 includes a first shell wall 27 perpendicular to the third direction Z, and the maximum distance between the fourth buffer member 34 and the outer surface of the first shell wall 27 along the third direction Z is less than or equal to 1.5 mm.

[0152] For example, in Figure 7 In the example shown, the maximum distance between the fourth buffer member 34 and the outer surface of the first shell wall 27 along the third direction Z is L5, and L5 is equal to 1.5 mm.

[0153] During the assembly process, taking into account the assembly tolerance of the fourth buffer component 34 and in order not to affect the normal use of the fourth buffer component 34, the distance between the fourth buffer component 34 and the first shell wall 27 in the third direction Z can be limited, thereby ensuring the assembly quality of the fourth buffer component 34 and the stable operation of the battery cell 20.

[0154] In different embodiments, the length, width and thickness of each buffer component can also be adjusted according to actual conditions.

[0155] See also Figure 7 In some embodiments, the length of the first buffer member 31 along the second direction Y is a, 3mm≤a≤10mm; and / or the length of the second buffer member 32 along the second direction Y is b, 3mm≤b≤10mm; and / or the length of the third buffer member 33 along the third direction Z is c, 3mm≤c≤8mm; and / or the length of the fourth buffer member 34 along the third direction Z is d, 3mm≤d≤8mm.

[0156] In some examples, the length of the first buffer 31 along the second direction Y is a, 3mm≤a≤10mm, the length of the second buffer 32 along the second direction Y is b, 3mm≤b≤10mm, and the length of the third buffer 33 along the third direction Z is c, 3mm≤c≤8mm.

[0157] In other examples, the length of the first buffer member 31 along the second direction Y is a, 3mm≤a≤10mm, the length of the second buffer member 32 along the second direction Y is b, 3mm≤b≤10mm, and the length of the fourth buffer member 34 along the third direction Z is d, 3mm≤d≤8mm.

[0158] In some other examples, the length of the first buffer 31 along the second direction Y is a, 3mm≤a≤10mm, the length of the second buffer 32 along the second direction Y is b, 3mm≤b≤10mm, the length of the third buffer 33 along the third direction Z is c, 3mm≤c≤8mm, and the length of the fourth buffer 34 along the third direction Z is d, 3mm≤d≤8mm. They are not listed here. The lengths of the above-mentioned buffers along the second direction Y can be understood as the widths of the buffers.

[0159] In this way, by limiting the width range of each buffer component, the processable range of each buffer component can be expanded without affecting the performance of each buffer component, and different buffer components with different widths can be used in combination to adapt to batteries 100 with first surfaces 24 of different sizes, thereby expanding the use range of the buffer assembly 30.

[0160] See also Fig.10 In some embodiments, the first buffer member 31 , the second buffer member 32 , the third buffer member 33 and the fourth buffer member 34 are enclosed together to form a closed frame.

[0161] Exemplarily, the first buffer member 31 and the second buffer member 32 are spaced apart along the second direction Y, and both extend along the third direction Z. The third buffer member 33 and the fourth buffer member 34 are spaced apart along the third direction Z, and both extend along the second direction Y. The head and tail of all buffer members are connected in sequence to form a quadrilateral frame.

[0162] In this way, the connection stability between two adjacent buffer members of the enclosed frame is better, which can improve the connection stability of the entire frame.

[0163] In addition, some embodiments of the present application further provide an electrical device, which includes the battery 100 in the above embodiment, and the battery 100 is used to provide electrical energy. For the relevant content of the battery 100, please refer to the above and no further details will be given here.

[0164] When different buffer components of the buffer assembly 30 in the electric device are arranged at different edge regions of the first surface 24 of the battery cell 20, when the battery cell 20 expands, the central region of the first surface 24 of the battery cell 20 expands to a greater extent than the edge region of the first surface 24. Therefore, by arranging different buffer components at different edge regions of the first surface 24, a certain expansion space can be reserved for the battery cell 20, thereby satisfying the expansion requirements of the battery cell 20.

[0165] In addition, manufacturing different buffer parts separately can reduce the probability of obtaining buffer parts that do not meet actual needs due to centralized preparation of all buffer parts, thereby reducing the probability of material waste caused by repeated cutting of buffer parts, and can save materials required for preparing buffer parts.

[0166] Specifically to an embodiment, Figure 7 As shown, the battery 100 includes a plurality of battery cells 20 and a plurality of buffer assemblies 30. The battery cell 20 includes a first surface 24, and the first surface 24 has a first central axis 241 extending along a second direction Y and a second central axis 242 extending along a third direction Z. The first surface 24 of one battery cell 20 faces another adjacent battery cell 20.

[0167] The first surface 24 of the battery cell 20 is provided with a buffer assembly 30, which includes a first buffer member 31, a second buffer member 32, a third buffer member 33 and a fourth buffer member 34, all of which are long strips. The first buffer member 31 and the second buffer member 32 are distributed on both sides of the second central axis 242 along the second direction Y, and the first buffer member 31 and the second buffer member 32 are both extended along the third direction Z. The third buffer member 33 and the fourth buffer member 34 are distributed on both sides of the first central axis 241 along the third direction Z, and the third buffer member 33 and the fourth buffer member 34 are both extended along the second direction Y.

[0168] Different buffer components of the buffer assembly 30 are arranged at different edge regions of the first surface 24 of the battery cell 20. When the battery cell 20 expands, the central region of the first surface 24 of the battery cell 20 expands to a greater extent than the edge region of the first surface 24. Therefore, by arranging different buffer components at different edge regions of the first surface 24, a certain expansion space can be reserved for the battery cell 20, thereby satisfying the expansion requirements of the battery cell 20.

[0169] In addition, manufacturing different buffer parts separately can reduce the probability of obtaining buffer parts that do not meet actual needs due to centralized preparation of all buffer parts, thereby reducing the probability of material waste caused by repeated cutting of buffer parts, and can save materials required for preparing buffer parts.

[0170] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0171] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery, characterized in that: include: A first battery cell, comprising a first surface perpendicular to a first direction, the first surface facing another adjacent battery cell; A buffer component is arranged on the first surface, and the buffer component includes a first buffer component, a second buffer component, a third buffer component and a fourth buffer component, all of which are elongated strips. The first buffer component and the second buffer component are respectively located on both sides of the central axis of the first surface along the second direction, and the third buffer component and the fourth buffer component are respectively located on both sides of the central axis of the first surface along the third direction, and the first direction and the second direction are perpendicular to the third direction in pairs.

2. The battery according to claim 1, characterized in that Projections of the first buffer component, the second buffer component, the third buffer component and the fourth buffer component along the first direction are completely misaligned.

3. The battery according to claim 2, characterized in that The first buffer component, the second buffer component, the third buffer component and the fourth buffer component are arranged at intervals from each other.

4. The battery according to claim 1, characterized in that The first battery cell includes an electrode assembly, the electrode assembly includes a pole ear extending along the third direction, the first buffer member and the second buffer member are arranged parallel to the third direction, and the first buffer member and the second buffer member are symmetrically distributed relative to the central axis of the first surface along the third direction.

5. The battery according to claim 1, characterized in that The first battery cell includes an electrode assembly, the electrode assembly includes a pole ear extending along the third direction, the third buffer member and the fourth buffer member are arranged parallel to the second direction, and the third buffer member and the fourth buffer member are symmetrically distributed relative to the central axis of the first surface along the second direction.

6. The battery according to claim 1, characterized in that The battery includes a carrier plate, the first battery cell includes a second surface adjacent to the first surface, the second surface is connected to the carrier plate by gluing, the carrier plate is perpendicular to the third direction, and the fourth buffer is arranged closer to the carrier plate than the third buffer; The maximum distance between the first buffer and the fourth buffer is smaller than the maximum distance between the first buffer and the third buffer, and / or the maximum distance between the second buffer and the fourth buffer is smaller than the maximum distance between the second buffer and the third buffer.

7. The battery according to claim 6, characterized in that A maximum distance between the first buffer component and the third buffer component along the third direction is less than or equal to 5.5 mm, and / or a maximum distance between the second buffer component and the third buffer component along the third direction is less than or equal to 5.5 mm.

8. The battery according to claim 1, characterized in that The first battery cell includes an electrode assembly, the electrode assembly includes a tab extending along the third direction, the third buffer is arranged closer to the tab than the fourth buffer, and the fourth buffer has greater elasticity than the third buffer.

9. The battery according to claim 8, characterized in that The electrode assembly includes a body, the electrode tab protrudes from the body, and the fourth buffer component is opposite to at least a portion of the body along the first direction.

10. The battery according to claim 1, characterized in that The first battery cell includes an end cover and a shell, the end cover is welded to the shell along the third direction cover, the third buffer is arranged closer to the end cover than the fourth buffer, and the weld formed by welding the end cover and the shell is completely misaligned with the third buffer.

11. The battery according to claim 10, characterized in that An edge of the first surface along the third direction close to the end cover is a first edge, and the welding seam is located between the third buffer component and the first edge.

12. The battery according to claim 1, characterized in that The first battery cell includes an end cover and a shell, the end cover is covered and welded to the shell along the third direction, the third buffer is arranged closer to the end cover than the fourth buffer, the edge of the first surface close to the end cover side along the third direction is the first edge, and the maximum distance between the third buffer and the first edge along the third direction is less than or equal to 1.5 mm.

13. The battery according to claim 1, characterized in that The first battery cell includes a first side surface, the first side surface is adjacent to the first surface and is transitionally connected to the first surface through a rounded curved surface, the second buffer is arranged closer to the first side surface than the first buffer, and the second buffer is spaced apart from the rounded curved surface.

14. The battery according to claim 13, characterized in that A maximum distance between the rounded curved surface and the second buffer along the second direction is less than or equal to 1.5 mm.

15. The battery according to claim 1, characterized in that The first battery cell includes a shell and an electrode assembly, the shell includes a first shell wall perpendicular to the third direction, a support member is arranged between the electrode assembly and the first shell wall, the fourth buffer member is closer to the first shell wall than the third buffer member, and the fourth buffer member is spaced apart from the outer surface of the first shell wall.

16. The battery according to claim 1, characterized in that The first battery cell includes a shell and an electrode assembly, the electrode assembly is accommodated in the shell, the shell includes a first shell wall perpendicular to the third direction, and the maximum distance between the fourth buffer and the outer surface of the first shell wall along the third direction is less than or equal to 1.5 mm.

17. The battery according to claim 4, characterized in that The length of the first buffer member along the second direction is a, 3mm≤a≤10mm; and / or, The length of the second buffer along the second direction is b, 3mm≤b≤10mm; and / or, The length of the third buffer along the third direction is c, 3mm≤c≤8mm; and / or, A length of the fourth buffer member along the third direction is d, and 3mm≤d≤8mm.

18. The battery according to claim 1, characterized in that The first buffer component, the second buffer component, the third buffer component and the fourth buffer component are enclosed together to form a closed frame.

19. An electrical device, characterized in that: The electrical device comprises a battery according to any one of claims 1 to 18, wherein the battery is used to provide electrical energy.

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