Battery and power-consuming device

Abstract

Battery, including: a first battery cell comprising a first surface perpendicular to a first direction, wherein the first surface faces an adjacent further battery cell; a buffer arrangement located on the first surface, the buffer arrangement comprising a first buffer element, a second buffer element, a third buffer element and a fourth buffer element, each having an elongated shape, wherein the first buffer element and the second buffer element are each arranged on opposite sides of a central axis of the first surface in a second direction, and the third buffer element and the fourth buffer element are each arranged on opposite sides of the central axis of the first surface in a third direction, wherein the first direction, the second direction and the third direction are each perpendicular to each other.

Description

Technical field

[0001] The present application relates to the field of batteries, in particular a battery and a power-consuming device. State of the art

[0002] The battery cells are typically glued to the bottom of the casing. When pressure is applied to the cells to improve the stability of their connection to the casing, the adhesive can easily seep into the space between two adjacent cells. This leads to localized lithium plating during the cyclic expansion of the battery cell due to uneven pressure distribution.

[0003] To reduce local lithium plating caused by adhesive overflow between two adjacent battery cells, a buffer arrangement is typically placed between them. This buffer arrangement prevents adhesive from overflowing from the bottom of the battery box into the space between the two adjacent battery cells. Due to the complex structure of current buffer arrangements, which results in relatively high production costs, there is an urgent need for a cost-effective buffer arrangement. Disclosure of the invention

[0004] In view of the aforementioned problems, the present application provides a battery and a power-consuming device.

[0005] In a first aspect, the present application provides a battery, wherein the battery comprises a first battery cell and a buffer arrangement.The first battery cell comprises a first surface perpendicular to a first direction, the first surface facing an adjacent further battery cell, the buffer arrangement being arranged on the first surface and comprising a first buffer element, a second buffer element, a third buffer element and a fourth buffer element, all having an elongated shape, the first buffer element and the second buffer element being arranged on opposite sides of the central axis of the first surface in the second direction, and the third buffer element and the fourth buffer element being arranged on opposite sides of the central axis of the first surface in the third direction, the first direction, the second direction and the third direction being perpendicular to each other.

[0006] In the technical solution of the embodiments of the present application, different buffer elements of the buffer arrangement are arranged in different boundary regions of the first surface of the battery cell. When the battery cell expands, the degree of expansion in the central region of the first surface of the battery cell is greater than in the boundary regions of the first surface. By arranging different buffer elements in different boundary regions of the first surface, a certain expansion space can be reserved for the battery cell, thus satisfying its expansion requirements.

[0007] Furthermore, manufacturing different buffer elements separately reduces the likelihood of producing buffer elements that do not meet actual requirements, since all buffer elements are manufactured centrally. This avoids repeated cutting of the buffer elements and the associated material waste, and saves on the materials required for manufacturing the buffer elements.

[0008] In some embodiments, the first buffer element, the second buffer element, the third buffer element and the fourth buffer element are completely offset in projection in the first direction.

[0009] Since the projections of the individual buffer elements do not overlap in the first direction, no parts of the two buffer elements are stacked on top of each other in the first direction after all buffer elements have been installed on the first surface. This reduces the probability of stress concentration in the stacked sections where certain parts of the buffer elements are stacked on top of each other, resulting in a greater thickness in these stacked sections compared to other areas.

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

[0011] A gap is provided between two adjacent buffer elements, which serves as a compression space when the buffer elements are compressed. This reduces the likelihood of parts of the two adjacent buffer elements overlapping due to compression, thus preventing stress concentrations and lithium plating. Furthermore, compared to joining the ends of the two adjacent buffer elements, this method also reduces the amount of material required to manufacture the buffer elements, thereby lowering the production costs of the buffer assembly.

[0012] In some embodiments, the first battery cell comprises an electrode arrangement, wherein the electrode arrangement includes an electrode tab, the electrode tab extending in the third direction, wherein the first buffer element and the second buffer element are arranged parallel to the third direction, and wherein the first buffer element and the second buffer element are symmetrically distributed relative to the first surface along the central axis of the third direction.

[0013] When the battery cell expands and presses against the first and second buffer elements, the external forces exerted on the battery cell by these elements are essentially equal. This is because the first and second buffer elements maintain an equal distance from the second central axis in the second direction. Consequently, the compressive forces exerted on the battery cell by the first and second buffer elements are also relatively uniform. This reduces the likelihood of the battery cell tilting due to uneven force distribution.

[0014] In some embodiments, the first battery cell comprises an electrode arrangement, wherein the electrode arrangement includes an electrode tab, the electrode tab extending in the third direction, wherein the third buffer element and the fourth buffer element are arranged parallel to the second direction, and wherein the third buffer element and the fourth buffer element are symmetrically distributed relative to the first surface along the central axis of the second direction.

[0015] When the battery cell expands and presses against the third and fourth buffer elements, the external forces exerted on the battery cell by these elements are essentially equal. This is because the third and fourth buffer elements maintain an equal distance from the first central axis in the third direction. Consequently, the compressive forces exerted on the battery cell by the third and fourth buffer elements are relatively uniform. This reduces the likelihood of the battery cell tilting due to uneven force distribution.

[0016] In some embodiments, the battery comprises a carrier plate, the first battery cell comprises a second surface, the second surface borders the first surface, the second surface is bonded to the carrier plate by means of adhesive, the carrier plate is perpendicular to a third direction, and the fourth buffer element is arranged closer to the carrier plate than the third buffer element.

[0017] The maximum distance between the first buffer element and the fourth buffer element is smaller than the maximum distance between the first buffer element and the third buffer element.

[0018] In this way, the amount of material required to manufacture the buffer elements can be reduced as much as possible without impairing the performance of the buffer arrangement.

[0019] In some embodiments, the battery comprises a carrier plate, the first battery cell comprises a second surface, the second surface borders the first surface, the second surface is bonded to the carrier plate by means of adhesive, the carrier plate is perpendicular to a third direction, and the fourth buffer element is arranged closer to the carrier plate than the third buffer element.

[0020] The maximum distance between the second buffer element and the fourth buffer element is smaller than the maximum distance between the second buffer element and the third buffer element.

[0021] In this way, the amount of material required to manufacture the buffer elements can be reduced as much as possible without impairing the performance of the buffer arrangement.

[0022] In some embodiments, the maximum distance between the first buffer element and the third buffer element in the third direction is less than or equal to 5.5 mm.

[0023] This reduces the overlap between the first buffer element and the third buffer element, thereby reducing the likelihood of local lithium plating due to stress concentrations caused by the increased thickness in the overlap area.

[0024] In some embodiments, the maximum distance between the second buffer element and the third buffer element in the third direction is less than or equal to 5.5 mm.

[0025] This reduces the overlap between the second and third buffer elements, thereby decreasing the likelihood of local lithium plating due to stress concentrations caused by the increased thickness in the overlap area.

[0026] In some embodiments, the first battery cell comprises an electrode arrangement, wherein the electrode arrangement includes an electrode tab, the electrode tab extending in the third direction, the third buffer element being located closer to the electrode tab than the fourth buffer element, and the elasticity of the fourth buffer element being greater than that of the third buffer element.

[0027] The elasticity of the fourth buffer element is greater than that of the third buffer element, thus providing a larger buffer space for the overlapping section of the electrode sheet.

[0028] In some embodiments, the electrode arrangement comprises a main body, wherein the electrode tab protrudes from the main body and the fourth buffer element is arranged opposite at least a part of the main body in the first direction.

[0029] Consequently, the fourth buffer element has a high elastic deformation capability, thereby providing a larger buffer space for the electrode arrangement, i.e., a larger buffer space for the battery cell itself, while simultaneously reducing the reaction force exerted by the fourth buffer element on the main body.

[0030] In some embodiments, the first battery cell comprises an end cap and a housing, wherein the end cap is closed over the housing in the third direction, wherein the end cap is welded to the housing, the third buffer element is arranged closer to the end cap than the fourth buffer element, and the weld seam formed by welding the end cap and the housing is completely offset from the third buffer element.

[0031] Even as the battery cell expands, the third buffer element does not press against the weld. This reduces the likelihood of damage to the weld from sustained pressure exerted by the expanding third buffer element, thus preventing the possibility of cracking between the casing and the end cap, which could impair the normal operation of the battery cell.

[0032] In some embodiments, the first surface comprises a first edge, wherein the first edge is located on the side of the first surface that is closer to the end cap in the third direction, and the weld is arranged between the third buffer element and the first edge.

[0033] This arrangement not only protects the weld from pressure stress when the third buffer element expands, but also reduces the likelihood of wear on the first weld, thus improving the stability of the connection between the end cap and the housing.

[0034] In some embodiments, the first battery cell comprises an end cap and a housing, wherein the end cap is closed over the housing in the third direction, wherein the end cap is welded to the housing, and the third buffer element is located closer to the end cap than the fourth buffer element, wherein the edge of the first surface that is closest to the end cap in the third direction is a first edge, and wherein the maximum distance between the third buffer element and the first edge in the third direction is less than or equal to 1.5 mm.

[0035] To account for the assembly tolerances of the third buffer element during installation and to ensure the normal operation of both the end cap and the third buffer element, the distance between the third buffer element and the first edge is limited in the third direction. This guarantees the assembly quality of the end cap and the third buffer element and thus ensures stable operation of the battery cell.

[0036] In some embodiments, the first battery cell comprises a first side surface, wherein the first side surface adjoins the first surface, wherein the first side surface is connected to the first surface via a rounded curved transition surface, wherein the second buffer element is arranged closer to the first side surface than the first buffer element and is spaced away from the rounded curved transition surface.

[0037] Consequently, sufficient expansion space for the battery cells can be provided even without the installation of buffer elements in the rounded, curved transition surface between two adjacent battery cells. This configuration reduces the number of buffer elements required and thus lowers the production costs of the buffer arrangement.

[0038] In some embodiments, the maximum distance between the rounded curved transition surface and the second buffer element in the second direction is less than or equal to 1.5 mm.

[0039] Taking into account the assembly tolerances of the second buffer element, the distance between the second buffer element and the rounded, curved transition surface is limited in the second direction to ensure the normal operation of the second buffer element. This guarantees the assembly quality of the second buffer element and stable operation of the battery cell.

[0040] In some embodiments, the first battery cell comprises a housing and an electrode arrangement, wherein the housing comprises a first housing wall, the first housing wall extending perpendicular to the third direction, and a support element arranged between the electrode arrangement and the first housing wall, wherein the fourth buffer element is arranged closer to the first housing wall than the third buffer element and the fourth buffer element is spaced away from the outer surface of the first housing wall.

[0041] Therefore, it is not necessary to connect the fourth buffer element to the first housing wall, which further reduces the number of buffer elements required and consequently lowers the manufacturing costs of the buffer assembly.

[0042] In some embodiments, the first battery cell comprises a housing and an electrode arrangement, wherein the electrode arrangement is received in the housing, wherein the housing comprises a first housing wall perpendicular to the third direction, and wherein the maximum distance between the fourth buffer element and the outer surface of the first housing wall in the third direction is less than or equal to 1.5 mm.

[0043] During assembly, taking into account the assembly tolerances of the fourth buffer element, the distance between the fourth buffer element and the first housing wall can be limited in the third direction to ensure the normal operation of the fourth buffer element. This guarantees the assembly quality of the fourth buffer element and stable operation of the battery cell.

[0044] In some embodiments, the length of the first buffer element in the second direction is a, where 3 mm ≤ a ≤ 10 mm.

[0045] By defining the width range of the first buffer element, its machinability can be expanded without impairing its performance. This allows buffer elements of different widths to be combined to accommodate batteries with first surfaces of varying dimensions, thereby broadening the application range of the buffer arrangement.

[0046] In some embodiments, the length of the second buffer element in the second direction is b, where 3 mm ≤ b ≤ 10 mm.

[0047] By defining the width range of the second buffer element, its machinability can be expanded without impairing its functional performance. This allows buffer elements of different widths to be combined to accommodate batteries with primary surfaces of varying dimensions, thereby broadening the application range of the buffer arrangement.

[0048] In some embodiments, the length of the third buffer element in the third direction is c, where 3 mm ≤ c ≤ 8 mm.

[0049] By defining the width range of the third buffer element, its machinability can be expanded without impairing its performance. This allows buffer elements of different widths to be combined to accommodate batteries with first surfaces of varying dimensions, thereby broadening the application range of the buffer arrangement.

[0050] In some embodiments, the length of the fourth buffer element in the third direction is d, where 3 mm ≤ d ≤ 8 mm.

[0051] By defining the width range of the fourth buffer element, its machinability can be expanded without impairing its performance. This allows buffer elements of different widths to be combined to accommodate batteries with first surfaces of varying dimensions, thereby broadening the application range of the buffer arrangement.

[0052] In some embodiments, the first buffer element, the second buffer element, the third buffer element and the fourth buffer element together form a closed frame structure.

[0053] In this way, the connection stability between two adjacent buffer elements of the formed frame structure is improved, which in turn can improve the connection stability of the entire frame structure.

[0054] In a second aspect, the present application provides a power-consuming device that includes the battery described in the aforementioned embodiments for power supply.

[0055] Different buffer elements of the buffer array are positioned at various edge regions of the primary surface of the battery cell within the power-consuming device. As the battery cell expands, the degree of expansion is greater in the central region of the primary surface than at the edges. By arranging different buffer elements at various edge regions of the primary surface, a certain expansion space can be reserved for the battery cell, thus meeting its expansion requirements.

[0056] Furthermore, manufacturing different buffer elements separately reduces the likelihood of producing buffer elements that do not meet actual requirements, since all buffer elements are manufactured centrally. This avoids repeated cutting of the buffer elements and the associated material waste, and saves on the materials required for manufacturing the buffer elements.

[0057] The above description merely provides an overview of the technical solution of the present application. To better understand the technical means of the present application, it can be implemented according to the details in the description. To make the above-mentioned and further purposes, features, and advantages of the present application clearer and more understandable, the detailed embodiments of the present application are listed below. Brief description of the drawings

[0058] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the present application are briefly presented below. The drawings described below naturally represent only some embodiments of the present application. Skilled engineers can create further drawings based on these without additional design effort. They show: Fig. 1 a schematic representation of the structure of a vehicle according to one or more embodiments; Fig. 2 an exploded view of a battery according to one or more embodiments; Fig. 3 an exploded view of a battery cell according to one or more embodiments; Fig. 4 a schematic representation showing the structure of a battery according to one or more embodiments, with certain structures hidden; Fig. 5 schematically the structure of the battery in Fig. 4 from a different perspective; Fig. 6 a three-dimensional view of a battery cell according to one or more embodiments, which is provided with a buffer arrangement; Fig. 7 a front view of a battery cell according to one or more embodiments, which is provided with a buffer arrangement; Fig. 8 a sectional view of a battery cell according to one or more embodiments, which is provided with a buffer arrangement; Fig. 9 a sectional view of a battery cell according to one or more embodiments, which is provided with a buffer arrangement; Fig. 10 a front view of a battery cell according to one or more embodiments, which is provided with a buffer arrangement.

[0059] The reference numerals in the detailed embodiments are as follows: 1000 vehicles; 100. Battery; 200. Control unit; 300. Motor; 10. Box body; 11. First section; 12. Second section; 20. Battery cell; 21. End cap; 21a. Electrode terminal; 22. Housing; 23. Electrode assembly; 24. First surface; 241. First central axis; 242. Second central axis; 25. Second surface; 26. Rounded curved transition surface; 27. First housing wall; 28. First side surface; 29. ​​Second side surface; 30. Buffer assembly; 31. First buffer element; 32. Second buffer element; 33. Third buffer element; 34. Fourth buffer element; X. First direction; Y. Second direction; Z. Third direction. Detailed descriptions

[0060] The technical solutions of the embodiments of the present application are now clearly and completely described with reference to the accompanying drawings. It is understood that the embodiments described here represent only a subset of the embodiments of the present application and not all of them. Based on the embodiments of the present application, all other embodiments that are obtained by persons skilled in the art in this field without any creative work fall within the scope of protection of the present application.

[0061] In the description of embodiments of the present application, technical terms such as "first" and "second" are used solely to distinguish between different objects and are not to be understood as indicating or suggesting a relative meaning, nor as implicitly specifying the quantity, particular order, or hierarchical relationship of the technical features mentioned. In the description of embodiments of the present application, the term "several" refers to more than two, unless expressly stated otherwise.

[0062] The reference to "embodiment" here means that a particular feature, structure, or property described in connection with the embodiments may be included in at least one embodiment of the present application. The occurrence of this expression at different points in the description does not necessarily always refer to the same embodiment, nor is it an independent or alternative embodiment that excludes other embodiments. It is expressly and implicitly clear to the person skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of this application, the term "several," where used, means two or more (including two). In the description of the embodiments of this application, the technical terms "center," "length," "width," "thickness," "bottom," "inside," "outside," and similar indications of direction or positional relationship refer to the direction or positional relationship as illustrated in the accompanying drawings. These terms are used solely for the purpose of facilitating the description of the embodiments of this application and for the simplification of the description, and do not mean or imply that the devices or elements mentioned must necessarily have a particular orientation, be constructed in a particular orientation, or be operated in a particular orientation.Therefore, they should not be interpreted as limitations on the embodiments of the present application.

[0064] In the description of the embodiments of the present application, technical terms such as "assemble," "connect," "couple," and "fasten" are to be interpreted broadly unless expressly stated and defined otherwise. They may, for example, denote a permanent connection, a detachable connection, or an integral structure; they may refer to a mechanical connection or an electrical connection; they may be direct connections or indirect connections via an intermediate medium; they may represent the internal connectivity between two components or the interactive relationship between two components. Those skilled in the art may understand the specific meanings of the aforementioned terms within the embodiments of the present application based on the circumstances.

[0065] Current market developments indicate that the use of high-performance batteries is becoming increasingly widespread. High-performance batteries are not only used in energy storage and power supply systems such as hydroelectric, thermal, wind, and solar power plants, but also find broad application in electric transport vehicles such as e-bikes, e-motorcycles, and electric cars, as well as in military equipment, aerospace, and other sectors. As the application areas of high-performance batteries continue to expand, market demand is also constantly increasing.

[0066] During the lifespan of a battery, individual battery cells can expand. This expansion is primarily due to the expansion of the electrode assembly. When the electrode assembly expands, it not only affects the casing of the individual battery cell it encloses but can also affect neighboring battery cells. This can lead to damage to the casing or leaks, thus compromising the reliability of individual battery cells. Therefore, a buffer arrangement is typically placed between adjacent battery cells to provide space for expansion.

[0067] The buffer arrangement currently used is usually not only structurally complex, but also requires repeated cutting, which leads to material waste in its manufacture and increases production costs.

[0068] To reduce the production costs of the buffer arrangement, the present application provides a battery. Four elongated buffer elements are arranged on a first surface of a battery cell, which faces another battery cell, the four buffer elements being divided into two groups. Each group comprises two buffer elements spaced apart from each other and arranged parallel to each other in the same direction, with the extension direction of each individual group of buffer elements being perpendicular. By simplifying the structure of the buffer arrangement, the production costs of the buffer arrangement are thus reduced.

[0069] The battery disclosed in the embodiments of this application can be used, but is not limited to, power-consuming devices such as vehicles, ships or aircraft, and can be used in the power supply systems of such power-consuming devices that include the battery disclosed herein.

[0070] The embodiments of the present application provide power-consuming devices, each of which uses a battery as a power source. The power-consuming devices include, among others, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys include, among others, stationary or mobile electric toys such as game consoles, electric toy cars, electric toy ships, and electric toy airplanes. Spacecraft include, among others, airplanes, rockets, space shuttles, and spacecraft.

[0071] For the sake of clarity, the following exemplary embodiments illustrate a power-consuming device according to an exemplary embodiment of the present application using the example of a vehicle.

[0072] As in Fig. 1 shown is Fig. Figure 1 shows a schematic representation of the structure of a vehicle 1000, which is provided in some embodiments of the present application. The vehicle 1000 can be a fuel-powered vehicle, a gas-powered vehicle, or a vehicle powered by alternative energy. The vehicle powered by alternative energy can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A battery 100 is arranged inside the vehicle 1000, and the battery 100 can be located at the bottom, at the front, or at the rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as the operating current source for the vehicle 1000.The vehicle 1000 can further comprise a controller 200 and a motor 300, wherein the controller 200 is used to control the battery 100 in order to supply power to the motor 300 during the operation (starting, steering, accelerating) of the vehicle 1000.

[0073] In some embodiments of the present application, the battery 100 can serve not only as an operating current source for the vehicle 1000, but also as a drive current source for the vehicle 1000, thereby replacing fuel or natural gas completely or partially with provided drive energy in order to provide drive current for the vehicle 1000.

[0074] As in Fig. 2 shown, is Fig. Figure 2 shows an exploded view of the structure of a battery 100, which is provided in some embodiments of the present application. The battery 100 comprises a box body 10 and a battery cell 20. The battery cell 20 is received in the box body 10. The box body 10 is used to provide a storage space for the battery cell 20, and the box body 10 can assume various structures. In some embodiments, the box body 10 can comprise a first section 11 and a second section 12. The first section 11 and the second section 12 cover each other, and together they define a receiving space for receiving the battery cell 20. The second section 12 can be a hollow structure with an open end, and the first section 11 can be a plate-like structure.The first section 11 covers the open side of the second section 12, so that the first section 11 and the second section 12 together define a receiving space. The first section 11 and the second section 12 can also be hollow structures with one open side, and the open side of the first section 11 covers the open side of the second section 12. Naturally, the box body 10 formed by the first section 11 and the second section 12 can have various shapes, which can be, for example, cylindrical or cuboid.

[0075] Within the battery 100, several battery cells 20 can be present. These multiple battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that several battery cells 20 are connected both in series and in parallel. Several battery cells 20 can be connected directly in series, parallel, or in a mixed configuration, and then the entire assembly of battery cells 20 can be installed in the housing 10. Of course, the battery 100 can also be in the form of a battery module, in which several battery cells 20 are first connected in series, parallel, or in a mixed configuration, and then the battery modules are connected in series, parallel, or in a mixed configuration to form a complete module and housed in the housing 10. The battery 100 can also include further structures.For example, the battery 100 can also include a current collection component for establishing an electrical connection between the multiple battery cells 20.

[0076] Each battery cell 20 can be a secondary or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, rectangular, or have other geometries.

[0077] As in Fig. 3 shown is Fig. 3 A schematic exploded view of the structure of a battery cell 20, which is provided in some embodiments of the present application. The battery cell 20 denotes the smallest unit of which the battery 100 consists. As in Fig. Figure 3 shows that the battery cell 20 comprises an end cover 21, a housing 22, an electrode arrangement 23 and other functional parts.

[0078] The end cap 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 can be adapted to the shape of the housing 22 so that it forms a form-fitting seal. Optionally, the end cap 21 can be made of a material with a specific hardness and strength (such as an aluminum alloy) to reduce deformation of the end cap 21 under pressure and increase the structural strength of the battery cell 20, thereby improving its safety performance. Functional components such as electrode terminals 21a can be provided on the end cap 21. An electrical connection to the electrode assembly 23 can be established via the electrode terminal 21a to supply or receive electrical energy from the battery cell 20.In some embodiments, the end cap 21 may also be equipped with a pressure relief mechanism for dissipating internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 may also be made of a variety of materials, for example, copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, and the present application is not limited in this respect. In some embodiments, an insulating element may additionally be provided on the inside of the end cap 21. The insulating element may serve to isolate the electrical connection components within the housing 22 from the end cap 21 in order to reduce the risk of a short circuit. For example, the insulating element may be made of plastic, rubber, or the like.

[0079] The housing 22 is a component used together with the end cap 21 to form an internal environment for the battery cell 20, the internal environment being used to accommodate the electrode assembly 23, the electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. The housing 22 can have an opening, and the end cap 21 can be closed at the opening to form an internal environment for the battery cell 20. The end cap 21 and the housing 22 can be formed as a single piece without restriction. In particular, the end cap 21 and the housing 22 can form a common interface before the insertion of other components. If the interior of the housing 22 needs to be encapsulated, the end cap 21 covers the housing 22. The housing 22 can have various shapes and sizes, for example, cuboid, cylindrical, or hexagonal prisms.The shape of the housing 22 can be determined according to the specific shape and size of the electrode arrangement 23. The housing 22 can be made of copper, iron, aluminum, stainless steel, an aluminum alloy, or plastic, and the present application is not limited in this respect.

[0080] The electrode assembly 23 is the component within the battery cell 20 in which electrochemical reactions take place. The housing 22 can contain one or more electrode assemblies 23. The electrode assembly 23 is primarily formed by winding or stacking a positive electrode sheet and a negative electrode sheet, with a separator typically positioned between the positive and negative electrode sheets. A section of the positive and negative electrode sheets containing the active material each forms a main body of the cell assembly, while a section of the positive and negative electrode sheets without the active material each forms an electrode tab. The positive electrode tab and the negative electrode tab can be located at one end of the main body or at both ends of the main body.During the charging and discharging process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the electrode tab connects to the electrode terminal 21a to form a current loop.

[0081] The following description of the battery provided by the embodiments of the present application is based on the detailed embodiment of battery cell 20 as a rectangular battery cell.

[0082] As in Fig. Figures 4 to 6 illustrate the embodiment of the present application providing a battery 100. The battery 100 comprises a first battery cell 20 and a buffer arrangement 30.The first battery cell 20 comprises a first surface 24 perpendicular to a first direction X, wherein the first surface 24 faces an adjacent second battery cell 20; the buffer arrangement 30 is arranged on the first surface 24 and the buffer arrangement 30 comprises a first buffer element 31, a second buffer element 32, a third buffer element 33 and a fourth buffer element 34, all having an elongated shape, wherein the first buffer element 31 and the second buffer element 32 are each arranged on opposite sides of the central axis of the first surface 24 in the second direction Y and the third buffer element 33 and the fourth buffer element 34 are each arranged on opposite sides of the central axis of the first surface 24 in the third direction, wherein the first direction X, the second direction Y and the third direction Z are each perpendicular to each other.

[0083] The battery 100 typically comprises several battery cells 20 arranged in a single direction. The first surface 24 of the battery cell 20 includes a central axis extending in the second direction Y and a central axis extending in the third direction Z. For ease of differentiation, the central axis extending along the second direction Y can be referred to as a first central axis 241, while the central axis extending along the third direction Z can be referred to as a second central axis 242.

[0084] It is understood that in the third direction Z, the first central axis 241 is equidistant from both edges of the first surface 24. In the second direction Y, the first central axis 241 is equidistant from both edges of the first surface 24.

[0085] The buffer assembly 30 is arranged between two adjacent battery cells 20 to compensate for the gap formed between them and provides expansion space for the battery cells 20 to absorb shocks and dampen vibrations. The four buffer elements of the buffer assembly 30 can together form either a closed or an open structure. When all buffer elements are arranged to form an open structure, each buffer element is configured independently.

[0086] It should be noted that the materials used for the various buffer elements may be identical, although there may also be differences in elastic deformation.

[0087] For example, as in the Fig. 4 and Fig. Figure 5 shows several battery cells 20 distributed in the first direction X, with a buffer arrangement 30 provided between each pair of adjacent battery cells 20. The first direction X, the second direction Y, and the third direction Z can each correspond to the thickness, length, and width directions of the individual battery cell 20 shown in the figure.

[0088] For the description, a rectangular battery cell is used as an example, namely battery cell 20, where one battery cell 20 among several battery cells 20 is referred to as a first battery cell 20 and, for example, a buffer arrangement 30 is mounted on the first battery cell 20.

[0089] The first surface 24 of the first battery cell 20 is provided with the buffer arrangement 30, the buffer arrangement 30 being attached to the first surface 24 by, among other things, gluing.

[0090] As in Fig. Figure 6 shows that the first surface 24 has a first central axis 241 extending in the second direction Y, and a second central axis 242 extending in the third direction Z. In some examples, a first buffer element 31 and a second buffer element 32 are distributed in the second direction Y on both sides of the second central axis 242, and both the first buffer element 31 and the second buffer element 32 are arranged to extend in the third direction Z. The third buffer element 33 and the fourth buffer element 34 are distributed in the third direction Z on both sides of the first central axis 241, and both the third buffer element 33 and the fourth buffer element 34 are arranged to extend in the second direction Y.

[0091] In some further examples, a first buffer element 31 and a second buffer element 32 are distributed in the third direction Z on both sides of the first central axis 241, and both the first buffer element 31 and the second buffer element 32 are arranged such that they extend in the second direction Y. The third buffer element 33 and the fourth buffer element 34 are distributed in the second direction Y on both sides of the second central axis 242, and both the third buffer element 33 and the fourth buffer element 34 are arranged such that they extend in the third direction Z.

[0092] It follows that different buffer elements of the buffer arrangement 30 are arranged at different boundary regions of the first surface 24 of the battery cell 20. When the battery cell 20 expands, the degree of expansion in the central region of the first surface 24 of the battery cell 20 is greater than in the boundary regions of the first surface 24. By placing different buffer elements in different boundary regions of the first surface 24, a certain expansion space can be reserved for the battery cell 20, thus satisfying its expansion requirements.

[0093] Furthermore, manufacturing different buffer elements separately reduces the likelihood of producing buffer elements that do not meet actual requirements, since all buffer elements are manufactured centrally. This avoids repeated cutting of the buffer elements and the associated material waste, and saves on the materials required for manufacturing the buffer elements.

[0094] In some embodiments and as in Fig. 6 and Fig. Figure 7 shows the first buffer element 31, the second buffer element 32, the third buffer element 33 and the fourth buffer element 34 completely offset in projection in the first direction X.

[0095] In other words, the projected profiles of two adjacent buffer elements in the first direction X are either spaced apart or tangential to each other. For example, the first buffer element 31 and the second buffer element 32 are positioned closer to the fourth buffer element 34 than the third buffer element 33, while the first buffer element 31 is positioned closer to a first end of the fourth buffer element 34 than the second buffer element 32. The projection of the first buffer element 31 in the first direction X does not overlap with the projection of the first end of the fourth buffer element 34 in the first direction X. Naturally, the projection of the remaining portions of the fourth buffer element 34 in the first direction X also does not overlap with the projection of the first buffer element 31 in the first direction X.

[0096] Likewise, the projection of the second buffer element 32 in the first direction X does not overlap with the projection of the fourth buffer element 34 in the first direction X. Likewise, the projections of the individual buffer elements along the first direction X do not overlap.

[0097] Since the projections of the individual buffer elements do not overlap in the first direction, no parts are stacked on top of each other between any two buffer elements in the first direction after all buffer elements have been installed on the first surface 24. This reduces the probability of stress concentration at the stacked sections where certain parts of the buffer elements are stacked on top of each other, resulting in a greater thickness at these stacked sections compared to other areas.

[0098] In some embodiments and as in Fig. Figure 7 shows the first buffer element 31, the second buffer element 32, the third buffer element 33 and the fourth buffer element 34, each spaced apart from each other.

[0099] In other words, the projections of the first buffer element 31, the second buffer element 32, the third buffer element 33 and the fourth buffer element 34 are spaced apart from each other by a certain distance in the first direction X.

[0100] For example, enclose, as in Fig. Figure 7 shows the first buffer element 31, the second buffer element 32, the third buffer element 33, and the fourth buffer element 34 together forming an open frame structure. The adjacent buffer elements are not connected to each other and are spaced apart.

[0101] When battery cell 20 expands and presses against the buffer elements, adjacent buffer elements can overlap under pressure in certain areas. This overlap leads to a stress concentration at the overlap points, which may cause local problems with the lithium plating.

[0102] A gap is provided between two adjacent buffer elements, which serves as a compression space when the buffer elements are compressed. This reduces the likelihood of parts of the two adjacent buffer elements overlapping due to compression, thus preventing stress concentrations and lithium plating. Furthermore, compared to joining the ends of two adjacent buffer elements, the aforementioned method also reduces the amount of material required to manufacture the buffer elements, thereby lowering the production costs of the buffer assembly 30.

[0103] In some embodiments and as in Fig. 7 and Fig. Figure 8 shows that the first battery cell 20 comprises an electrode arrangement 23, wherein the electrode arrangement 23 comprises an electrode tab (not shown), the electrode tab extending in the third direction Z, wherein the first buffer element 31 and the second buffer element 32 are arranged parallel to the third direction Z, and wherein the first buffer element 31 and the second buffer element 32 are symmetrically distributed relative to the first surface 24 along the central axis of the third direction Z.

[0104] Since the central axis (the second central axis 242) extending in the third direction Z of the first surface 24 substantially coincides with the central axis extending in the third direction Z of the electrode arrangement 23, the first buffer element 31 and the second buffer element 32 are substantially distributed along the two edges of the first surface 24 extending in the second direction Y. The first buffer element 31 and the second buffer element 32 are equidistant from the second central axis 242.

[0105] When the battery cell 20 expands and presses against the first buffer element 31 and the second buffer element 32, the external forces exerted on the battery cell 20 by the first buffer element 31 and the second buffer element 32 are essentially equal. This is because the first buffer element 31 and the second buffer element 32 maintain an equal distance from the second central axis 242 in the second direction Y. Consequently, the compressive forces exerted on the battery cell 20 by the first buffer element 31 and the second buffer element 32 are also relatively uniform. This reduces the probability of the battery cell 20 tilting due to an uneven force distribution.

[0106] In some embodiments and as in Fig. Figure 7 shows that the first battery cell 20 comprises an electrode arrangement 23, wherein the electrode arrangement 23 comprises an electrode tab, the electrode tab extending in the third direction Z, wherein the third buffer element 33 and the fourth buffer element 34 are arranged parallel to the second direction Y, and wherein the third buffer element 33 and the fourth buffer element 34 are symmetrically distributed relative to the first surface along 24 of the central axis of the second direction Y.

[0107] Since the central axis (the first central axis 241) extending in the second direction Y of the first surface 24 essentially coincides with the central axis extending in the second direction Y of the electrode arrangement 23, the third buffer element 33 and the fourth buffer element 34 are substantially distributed along the two edges of the first surface 24 extending in the third direction Z. The third buffer element 33 and the fourth buffer element 34 are equidistant from the first central axis 241.

[0108] When the battery cell 20 expands and presses against the third buffer element 33 and the fourth buffer element 34, the external forces exerted on the battery cell 20 by the third buffer element 33 and the fourth buffer element 34 are essentially equal. This is because the third buffer element 33 and the fourth buffer element 34 maintain an equal distance from the first central axis 241 in the third direction Z. Consequently, the compressive forces exerted on the battery cell 20 by the third buffer element 33 and the fourth buffer element 34 are relatively uniform. This reduces the probability of the battery cell 20 tilting due to an uneven force distribution.

[0109] In some embodiments and as in Fig. 7 and Fig. As shown in Figure 8, the battery 100 comprises a carrier plate (not shown). The first battery cell 20 comprises a second surface 25, the second surface 25 being adjacent to the first surface 24. The second surface 25 is bonded to the carrier plate, which is perpendicular to the third direction Z. The fourth buffer element 34 is located closer to the carrier plate than the third buffer element 33. The maximum distance between the first buffer element 31 and the fourth buffer element 34 is less than the maximum distance between the first buffer element 31 and the third buffer element 33.

[0110] In some embodiments, the maximum distance between the second buffer element 32 and the fourth buffer element 34 is smaller than the maximum distance between the second buffer element 32 and the third buffer element 33.

[0111] The carrier plate serves to hold all battery cells 20. The maximum distance between the first buffer element 31 and the fourth buffer element 34 can be understood as the size of the gap formed between them in the third direction Z. The maximum distance between the first buffer element 31 and the third buffer element 33 can be understood as the size of the gap formed between them in the third direction Z. The maximum distance between the second buffer element 32 and the fourth buffer element 34 can be understood as the size of the gap formed between them in the third direction Z. The maximum distance between the second buffer element 32 and the third buffer element 33 can be understood as the size of the gap formed between them in the third direction Z. In various embodiments, the size of the gaps formed between the different buffer elements varies.

[0112] In some examples, the maximum distance between the first buffer element 31 and the third buffer element 33 is smaller than the maximum distance between the first buffer element 31 and the fourth buffer element 34. The maximum distances between the other buffer elements are not specifically defined.

[0113] In some further examples, the maximum distance between the second buffer element 32 and the fourth buffer element 34 is smaller than the maximum distance between the second buffer element 32 and the third buffer element 33. The maximum distances between the other buffer elements are not specifically defined. In some further examples, the maximum distance between the first buffer element 31 and the third buffer element 33 is smaller than the maximum distance between the first buffer element 31 and the fourth buffer element 34, and the maximum distance between the second buffer element 32 and the fourth buffer element 34 is smaller than the maximum distance between the second buffer element 32 and the third buffer element 33.

[0114] When the first battery cell 20 is bonded to the carrier plate and the buffer assembly 30 is attached to the first surface 24, the space between the fourth buffer element 34 and the carrier plate is essentially filled with adhesive. Since the gap formed between the first buffer element 31 and the fourth buffer element 34, and the gap formed between the second buffer element 32 and the fourth buffer element 34, are relatively small, the probability of adhesive applied to the carrier plate reaching the space between two adjacent battery cells 20 directly through the gap between the first buffer element 31 and the fourth buffer element 34, or through the gap between the second buffer element 32 and the fourth buffer element 34, is reduced. This minimizes the probability of voltage concentration between two adjacent battery cells 20, thereby preventing local lithium plating.

[0115] In this way, the amount of material required to manufacture the buffer elements can be reduced as much as possible without impairing the performance of the buffer arrangement 30.

[0116] Furthermore, in some embodiments and as in Fig. Figure 7 shows that the maximum distance between the first buffer element 31 and the third buffer element 33 in the third direction Z is less than or equal to 5.5 millimeters (mm). In some embodiments, the maximum distance between the second buffer element 32 and the third buffer element 33 in the third direction Z is less than or equal to 5.5 mm.

[0117] For example, in some examples, the maximum distance between the first buffer element 31 and the third buffer element 33 in the third direction Z is L1, where L1 is less than or equal to 5.5 mm, while the maximum distances between other buffer elements are not specifically defined. In some further examples, the maximum distance between the second buffer element 32 and the third buffer element 33 in the third direction Z is L2, where L2 is greater than or equal to 5.5 mm, while the maximum distances between other buffer elements are not specifically defined. In some further examples, the maximum distance L1 between the first buffer element 31 and the third buffer element 33 in the third direction Z is less than or equal to 5.5 mm, and the maximum distance L2 between the second buffer element 32 and the third buffer element 33 in the third direction Z is greater than or equal to 5.5 mm.

[0118] When mounting the first buffer element 31 on the first surface 24, its mounting position is spaced apart from that of the third buffer element 33. This arrangement reduces the overlap between the first buffer element 31 and the third buffer element 33, thus preventing an increase in thickness in the overlap area that could lead to stress concentration. Furthermore, an increase in the gap between the first buffer element 31 and the third buffer element 33 would also cause the adhesive to overflow from this gap into the two adjacent gaps, resulting in local stress concentration and thus local lithium plating.

[0119] Similarly, the gap formed between the second buffer element 32 and the third buffer element 33 in the third direction Z is limited to reduce the overlap between the second and third buffer elements 33. This prevents an increase in thickness in the overlap area and thus reduces stress concentration. Furthermore, optionally increasing the gap between the second and third buffer elements 33 would cause the adhesive to overflow from this gap into the two adjacent gaps, leading to local stress concentration and thus local lithium plating.

[0120] In some embodiments and as in Fig. Figure 7 shows that the first battery cell 20 comprises an electrode arrangement 23, wherein the electrode arrangement 23 comprises an electrode tab, the electrode tab extending in the third direction Z, the third buffer element 33 being located closer to the electrode tab than the fourth buffer element 34, and the elasticity of the fourth buffer element 34 being greater than that of the third buffer element 33.

[0121] The fourth buffer element 34 can be made from materials with a Poisson's ratio of more than 0.45, such as rubber, TPU, TPE and other thermoplastic materials.

[0122] Typically, a gap is provided at the location of the electrode tab, with the electrode tab and the electrode sheet of the electrode assembly 23 separated by a distance. The wound electrode sheet has an overlap section whose projection in the first direction X partially overlaps that of the fourth buffer element 34. Since the overlap section of the electrode sheet is more prone to expansion, and the fourth buffer element 34 is positioned closer to this overlap section relative to the third buffer element 33, the expansion space required at the fourth buffer element 34 is larger than that required at the third buffer element 33. Consequently, the elasticity of the fourth buffer element 34 is greater than that of the third buffer element 33, thus providing a larger buffer space for the overlapping section of the electrode sheet.

[0123] In some embodiments and as in Fig. As shown in Figure 8, the electrode arrangement 23 comprises a main body, wherein the electrode tab protrudes from the main body and the fourth buffer element 34 is arranged opposite at least a part of the main body in the first direction X.

[0124] In some examples, the projection of the fourth buffer element 34 in the first direction X lies completely within the projection of the main body in the first direction X. In some other examples, the projection of the fourth buffer element 34 in the first direction X does not fall completely within the projection of the main body in the first direction X.

[0125] When the battery cell 20 expands, the main body of the electrode assembly 23 tends to expand and press against the fourth buffer element 34, causing the fourth buffer element 34 to undergo elastic deformation. Consequently, the fourth buffer element 34 has a high elastic deformation capacity, thus providing a larger buffer space for the electrode assembly 23, i.e., a larger buffer space for the battery cell 20 itself, while simultaneously reducing the reaction force exerted by the fourth buffer element 34 on the main body.

[0126] In some embodiments and as in Fig. Figure 8 shows that the first battery cell 20 comprises an end cover 21 and a housing 22, wherein the end cover 21 is closed over the housing 22 in the third direction Z, wherein the end cover 21 is welded to the housing 22, the third buffer element 33 is arranged closer to the end cover 21 than the fourth buffer element 34, and the weld formed by welding the end cover 21 and the housing 22 is completely offset from the third buffer element 33.

[0127] During the assembly of the battery cell 20, components such as the electrode assembly 23, which must be installed inside the housing 22, can be installed in the housing 22 in the third direction Z. The end cap 21 can then be welded to the housing 22. The end cap 21 and the housing 22 can be welded together, forming a weld seam. The third buffer element 33 is located near the end cap 21 and spaced apart from the weld seam.

[0128] Even as the battery cell 20 expands, the third buffer element 33 does not press against the weld. This reduces the likelihood of damage to the weld due to sustained pressure from the expanded third buffer element 33, thereby preventing the possibility of cracking between the housing 22 and the end cap 21, which could impair the normal operation of the battery cell 20.

[0129] In some embodiments and as in Fig. 7 and Fig. Figure 8 shows that the first surface 24 includes in particular a first edge (not shown), wherein the first edge is located on the side of the first surface 24 which is closer to the end cover 21 in the third direction Z, and the weld is arranged between the third buffer element 33 and the first edge.

[0130] Welding the end cap 21 to the housing 22, with the weld seam positioned between the third buffer element 33 and the first edge, and not on the first edge itself, not only protects the weld seam from pressure when the third buffer element 33 expands, but also reduces the likelihood of wear on the first weld seam. This improves the connection stability between the end cap 21 and the housing 22.

[0131] In some embodiments, the first battery cell 20 comprises an end cap 21 and a housing 22, wherein the end cap 21 is closed over the housing 22 in the third direction Z, wherein the end cap 21 is welded to the housing 22, and the third buffer element 33 is arranged closer to the end cap 21 than the fourth buffer element 34, wherein the first surface 24 comprises a first edge (not shown), the first edge being on the side of the first surface 24 that is closer to the end cap 21 in the third direction Z, and wherein the maximum distance between the third buffer element 33 and the first edge in the third direction Z is less than or equal to 1.5 mm.

[0132] For example, in the Fig. Example 7 shows the maximum distance between the third buffer element 33 and the first edge in the third direction Z L3, where L3 corresponds to 1.5 mm.

[0133] To account for the assembly tolerances of the third buffer element 33 during assembly and to ensure the normal operation of both the end cap 21 and the third buffer element 33, the distance between the third buffer element 33 and the first edge in the third direction Z is limited. This guarantees the assembly quality of the end cap 21 and the third buffer element 33 and thus ensures stable operation of the battery cell 20.

[0134] In some embodiments and as in Fig. 6 and Fig. Figure 9 shows that the first battery cell 20 comprises a first side surface 28, wherein the first side surface 28 adjoins the first surface 24, wherein the first side surface 28 is connected to the first surface 24 via a rounded curved transition surface 26, wherein the second buffer element 32 is arranged closer to the first side surface 28 than the first buffer element 31 and the second buffer element 32 is spaced away from the rounded curved transition surface 26.

[0135] In the Fig. In the example shown in Figure 9, the first side surface 28 is connected to the first surface 24 in the second direction Y, and a rounded curved transition surface 26 is connected between them. The second buffer element 32 is arranged on the side of the first surface 24 next to the rounded curved transition surface 26, with the rounded curved transition surface 26 being located between the second buffer element 32 and the first side surface 28. Thus, if no buffer arrangement 30 is arranged between two adjacent battery cells 20, the rounded curved transition surfaces 26 corresponding to each battery cell 20 in the adjacent pair of battery cells 20 are separated from each other by a distance.However, a buffer arrangement 30 is already provided between two adjacent battery cells 20, which naturally creates a distance between the corresponding rounded curved transition surfaces 26 of these two adjacent battery cells 20.

[0136] Consequently, even without installing buffer elements in the rounded curved transition surface 26 between two adjacent battery cells 20, sufficient expansion space for the battery cells 20 can be provided. This configuration reduces the number of buffer elements required and thus lowers the production costs of the buffer arrangement 30.

[0137] In some embodiments, the maximum distance between the rounded curved transition surface 26 and the second buffer element 32 in the second direction Y is in particular less than or equal to 1.5 mm.

[0138] For example, in the Fig. In the example shown in Figure 10, the maximum distance between the rounded curved transition surface 26 and the second buffer element 32 in the second direction Y L4 is shown, where L4 corresponds to 1.5 mm.

[0139] Taking into account the assembly tolerances of the second buffer element 32, the distance between the second buffer element 32 and the rounded curved transition surface 26 in the second direction Y is limited to ensure the normal operation of the second buffer element 32. This guarantees the assembly quality of the second buffer element 32 and stable operation of the battery cell 20.

[0140] Likewise, as in Fig. 6, Fig. 9 and Fig. As shown in Figure 10, the first battery cell 20 comprises a second side surface 29. The first side surface 28 and the second side surface 29 are arranged opposite each other. The first side surface 28 borders the first surface 24 and is connected to it via a rounded, curved transition surface 26. The first buffer element 31 is located closer to the second side surface 29 than the second buffer element 32, and the first buffer element 31 is spaced away from the rounded, curved transition surface 26. The maximum distance between the rounded, curved transition surface 26 and the first buffer element 31 in the second direction Y is less than or equal to 1.5 mm.

[0141] Therefore, no buffer elements need to be arranged on the rounded curved transition surfaces 26, where the first surface 24 of the battery cell 20 is close to both the first buffer element 31 and the second buffer element 32. This reduces the number of buffer elements required and thus lowers the production costs of the buffer arrangement 30.

[0142] In some embodiments and as in Fig. Figure 8 shows that the first battery cell 20 comprises a housing 22 and an electrode arrangement 23, wherein the housing 22 comprises a first housing wall 27, the first housing wall 27 extending perpendicular to the third direction Z and a support element (not shown) arranged between the electrode arrangement 23 and the first housing wall 27, wherein the fourth buffer element 34 is arranged closer to the first housing wall 27 than the third buffer element 33 and the fourth buffer element 34 is spaced away from the outer surface of the first housing wall 27.

[0143] The support element serves to mount the electrode assembly 23. The fourth buffer element 34 is arranged on the first surface 24 of the housing 22 and is located near the first housing wall 27, but the fourth buffer element 34 and the first housing wall 27 are not connected to each other. When the battery 100 expands, it presses on the first surface 24 of the housing 22, but not on the first housing wall 27.

[0144] Thus, it is not necessary to connect the fourth buffer element 34 to the first housing wall 27, which further reduces the number of buffer elements required and consequently lowers the manufacturing costs of the buffer arrangement 30.

[0145] In some embodiments and as in Fig. Figure 7 shows that the first battery cell 20 further comprises a housing 22 and an electrode arrangement 23, wherein the electrode arrangement 23 is received in the housing 22, wherein the housing 22 comprises a first housing wall 27 perpendicular to the third direction Z and wherein the maximum distance between the fourth buffer element 34 and the outer surface of the first housing wall 27 in the third direction Z is less than or equal to 1.5 mm.

[0146] For example, in the Fig. In example 7, the maximum distance between the fourth buffer element 34 and the outer surface of the first housing wall 27 in the third direction Z L5 is given by L5, where L5 corresponds to 1.5 mm.

[0147] During assembly, taking into account the assembly tolerances of the fourth buffer element 34, the distance between the fourth buffer element 34 and the first housing wall 27 in the third direction Z can be limited to ensure the normal operation of the fourth buffer element 34. This guarantees the assembly quality of the fourth buffer element 34 and stable operation of the battery cell 20.

[0148] In various embodiments, the length, width and thickness of the individual buffer element can also be adapted to the actual conditions.

[0149] In some embodiments and as in Fig. Figure 7 shows that the length of the first buffer element 31 in the second direction is Y a, where 3 mm ≤ a ≤ 10 mm. In some embodiments, the length of the second buffer element 32 in the second direction is Y b, where 3 mm ≤ b ≤ 10 mm. In some embodiments, the length of the third buffer element 33 in the third direction is Z c, where 3 mm ≤ c ≤ 8 mm. In some embodiments, the length of the fourth buffer element 34 in the third direction is Z d, where 3 mm ≤ d ≤ 8 mm.

[0150] In some examples, the length of the first buffer element 31 in the second direction is Y a, where 3 mm ≤ a ≤ 10 mm, the length of the second buffer element 32 in the second direction is Y b, where 3 mm ≤ b ≤ 10 mm, and the length of the third buffer element 33 in the third direction is Z c, where 3 mm ≤ c ≤ 8 mm.

[0151] In some further examples, the length of the first buffer element 31 in the second direction is Y a, where 3 mm ≤ a ≤ 10 mm, the length of the second buffer element 32 in the second direction is Y b, where 3 mm ≤ b ≤ 10 mm, and the length of the fourth buffer element 34 in the third direction is Z d, where 3 mm ≤ d ≤ 8 mm.

[0152] In some examples, the length of the first buffer element 31 in the second direction Y is a, where 3 mm ≤ a ≤ 10 mm; the length of the second buffer element 32 in the second direction Y is b, where 3 mm ≤ b ≤ 10 mm; the length of the third buffer element 33 in the third direction Z is c, where 3 mm ≤ c ≤ 8 mm; and the length of the fourth buffer element 34 in the third direction Z is d, where 3 mm ≤ d ≤ 8 mm. No further examples are given here. The length of each of the aforementioned buffer elements in the second direction Y can be understood as the width of the respective buffer element.

[0153] By defining the width range of each buffer element, its machinability can be expanded without impairing its functional performance. This allows buffer elements of different widths to be combined to accommodate batteries 100 with first surfaces 24 of different dimensions, thereby extending the application range of the buffer arrangement 30.

[0154] In some embodiments and as in Fig. Figure 10 shows the first buffer element 31, the second buffer element 32, the third buffer element 33 and the fourth buffer element 34 together forming a closed frame structure.

[0155] For example, the first buffer element 31 and the second buffer element 32 are spaced apart in the second direction Y and both extend in the third direction Z. The third buffer element 33 and the fourth buffer element 34 are spaced apart in the third direction Z and both extend along the second direction Y. A quadrilateral frame structure can be formed by sequentially connecting all buffer elements end-to-end.

[0156] In this way, the connection stability between two adjacent buffer elements of the formed frame structure is improved, which in turn can improve the connection stability of the entire frame structure.

[0157] Furthermore, some embodiments of the present application also provide a power-consuming device comprising the battery 100 described in the aforementioned embodiments, wherein the battery 100 serves as the power supply. Details of battery 100 can be found in the preceding text; further explanation is omitted here.

[0158] Various buffer elements of the buffer arrangement 30 are arranged at different edge regions of the first surface 24 of the battery cell 20 in the power-consuming device. When the battery cell 20 expands, the degree of expansion in the central region of the first surface 24 of the battery cell 20 is greater than in the edge regions of the first surface 24. By placing different buffer elements at different edge regions of the first surface 24, a certain expansion space can be reserved for the battery cell 20, thus satisfying its expansion requirements.

[0159] Furthermore, manufacturing different buffer elements separately reduces the likelihood of producing buffer elements that do not meet actual requirements, since all buffer elements are manufactured centrally. This avoids repeated cutting of the buffer elements and the associated material waste, and saves on the materials required for manufacturing the buffer elements.

[0160] In one embodiment and as in Fig. As shown in Figure 7, the battery 100 comprises several battery cells 20 and several buffer arrangements 30. The battery cell 20 comprises a first surface 24, wherein the first surface 24 has a first central axis 241 extending in a second direction Y, and a second central axis 242 extending in a third direction Z. The first surface 24 of one of the battery cells 20 faces an adjacent further battery cell 20.

[0161] The first surface 24 of the battery cell 20 is provided with a buffer arrangement 30, the buffer arrangement 30 comprising a first buffer element 31, a second buffer element 32, a third buffer element 33, and a fourth buffer element 34, all of which have an elongated shape. The first buffer element 31 and the second buffer element 32 are distributed in the second direction Y on both sides of the second central axis 242, and both the first buffer element 31 and the second buffer element 32 are arranged to extend in the third direction Z. The third buffer element 33 and the fourth buffer element 34 are distributed in the third direction Z on both sides of the first central axis 241, and both the third buffer element 33 and the fourth buffer element 34 are arranged to extend in the second direction Y.

[0162] Different buffer elements of the buffer arrangement 30 are arranged at different edge regions of the first surface 24 of the battery cell 20. When the battery cell 20 expands, the degree of expansion in the central region of the first surface 24 of the battery cell 20 is greater than in the edge regions of the first surface 24. By placing different buffer elements at different edge regions of the first surface 24, a certain expansion space can be reserved for the battery cell 20, thus satisfying its expansion requirements.

[0163] Furthermore, manufacturing different buffer elements separately reduces the likelihood of producing buffer elements that do not meet actual requirements, since all buffer elements are manufactured centrally. This avoids repeated cutting of the buffer elements and the associated material waste, and saves on the materials required for manufacturing the buffer elements.

[0164] The various technical features described in the exemplary embodiments above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the aforementioned exemplary embodiments have been described. However, provided such combinations do not conflict with one another, they fall within the scope of this description.

[0165] The foregoing exemplary embodiments merely illustrate some embodiments of the present application, which are described in great detail and with specificity; however, this should not be interpreted as limiting the scope of the claims. It should be noted that a person skilled in the art could make a number of modifications and improvements without departing from the concept of the present application, and that these all fall within the scope of protection of the present application. The scope of protection of the present patent application is therefore determined by the attached claims.

Claims

[1] Battery, comprising: a first battery cell comprising a first surface perpendicular to a first direction, wherein the first surface faces an adjacent further battery cell; a buffer arrangement located on the first surface, the buffer arrangement comprising a first buffer element, a second buffer element, a third buffer element and a fourth buffer element, each having an elongated shape, wherein the first buffer element and the second buffer element are each arranged on opposite sides of a central axis of the first surface in a second direction, and the third buffer element and the fourth buffer element are each arranged on opposite sides of the central axis of the first surface in a third direction, wherein the first direction, the second direction and the third direction are each perpendicular to each other. [2] Battery according to claim 1, wherein the first buffer element, the second buffer element, the third buffer element and the fourth buffer element are completely offset in projection in the first direction. [3] Battery according to claim 2, wherein the first buffer element, the second buffer element, the third buffer element and the fourth buffer element are each spaced apart from each other. [4] Battery according to one of claims 1 to 3, wherein the first battery cell comprises an electrode arrangement, wherein the electrode arrangement comprises an electrode tab, wherein the electrode tab extends in the third direction, wherein the first buffer element and the second buffer element are arranged parallel to the third direction, and wherein the first buffer element and the second buffer element are symmetrically distributed relative to the first surface along the central axis of the third direction. [5] Battery according to any one of claims 1 to 4, wherein the first battery cell comprises an electrode arrangement, wherein the electrode arrangement comprises an electrode tab, wherein the electrode tab extends in the third direction, wherein the third buffer element and the fourth buffer element are arranged parallel to the second direction, and wherein the third buffer element and the fourth buffer element are symmetrically distributed relative to the first surface along the central axis of the second direction. [6] Battery according to any one of claims 1 to 5, wherein the battery comprises a carrier plate, wherein the first battery cell comprises a second surface, wherein the second surface borders the first surface, wherein the second surface is bonded to the carrier plate, wherein the carrier plate is perpendicular to the third direction, and wherein the fourth buffer element is arranged closer to the carrier plate than the third buffer element; wherein a maximum distance between the first buffer element and the fourth buffer element is less than the maximum distance between the first buffer element and the third buffer element. [7] Battery according to any one of claims 1 to 6, wherein the battery comprises a carrier plate, wherein the first battery cell comprises a second surface, wherein the second surface borders the first surface, wherein the second surface is bonded to the carrier plate, wherein the carrier plate is perpendicular to the third direction, wherein the fourth buffer element is arranged closer to the carrier plate than the third buffer element, wherein the maximum distance between the second buffer element and the fourth buffer element is less than the maximum distance between the second buffer element and the third buffer element. [8] Battery according to one of claims 6 or 7, wherein the maximum distance between the first buffer element and the third buffer element in the third direction is less than or equal to 5.5 mm. [9] Battery according to one of claims 6 or 7, wherein the maximum distance between the second buffer element and the third buffer element in the third direction is less than or equal to 5.5 mm. [10] Battery according to any one of claims 1 to 9, wherein the first battery cell comprises an electrode arrangement, wherein the electrode arrangement comprises an electrode tab, wherein the electrode tab extends in the third direction, wherein the third buffer element is arranged closer to the electrode tab than the fourth buffer element, and wherein the elasticity of the fourth buffer element is greater than that of the third buffer element. [11] Battery according to claim 10, wherein the electrode arrangement comprises a main body, wherein the electrode tab protrudes from the main body and the fourth buffer element is arranged opposite at least a part of the main body in the first direction. [12] Battery according to any one of claims 1 to 11, wherein the first battery cell comprises an end cap and a housing, wherein the end cap is closed over the housing in the third direction, wherein the end cap is welded to the housing, wherein the third buffer element is arranged closer to the end cap than the fourth buffer element, and wherein a weld seam formed by welding the end cap and the housing is completely offset from the third buffer element. [13] Battery according to claim 12, wherein the first surface comprises a first edge, the first edge being located on the side of the first surface which is closer to the end cap in the third direction, and wherein the weld is arranged between the third buffer element and the first edge. [14] Battery according to any one of claims 1 to 13, wherein the first battery cell comprises an end cap and a housing, wherein the end cap is closed over the housing in the third direction, wherein the end cap is welded to the housing and the third buffer element is arranged closer to the end cap than the fourth buffer element, wherein the first surface comprises a first edge, wherein the first edge is located on the side of the first surface which is closer to the end cap in the third direction, wherein the maximum distance between the third buffer element and the first edge in the third direction is less than or equal to 1.5 mm. [15] Battery according to any one of claims 1 to 14, wherein the first battery cell comprises a first side surface, wherein the first side surface adjoins the first surface, wherein the first side surface is transitionally connected to the first surface via a rounded curved surface, wherein the second buffer element is arranged closer to the first side surface than the first buffer element, and wherein the second buffer element is spaced away from the rounded curved surface. [16] Battery according to claim 15, wherein the maximum distance between the rounded curved surface and the second buffer element in the second direction is less than or equal to 1.5 mm. [17] Battery according to any one of claims 1 to 16, wherein the first battery cell comprises a housing and an electrode arrangement, wherein the housing comprises a first housing wall, wherein the first housing wall extends perpendicular to the third direction and a support element is arranged between the electrode arrangement and the first housing wall, wherein the fourth buffer element is arranged closer to the first housing wall than the third buffer element and the fourth buffer element is spaced away from the outer surface of the first housing wall. [18] Battery according to any one of claims 1 to 17, wherein the first battery cell comprises a housing and an electrode arrangement, wherein the electrode arrangement is received in the housing, wherein the housing comprises a first housing wall perpendicular to the third direction and wherein the maximum distance between the fourth buffer element and the outer surface of the first housing wall in the third direction is less than or equal to 1.5 mm. [19] Battery according to any one of claims 4 to 18, wherein the length of the first buffer element in the second direction is a, where 3 mm ≤ a ≤ 10 mm. [20] Battery according to any one of claims 4 to 19, wherein the length of the second buffer element in the second direction is b, where 3 mm ≤ b ≤ 10 mm. [21] Battery according to any one of claims 4 to 20, wherein the length of the third buffer element in the third direction is c, where 3 mm ≤ c ≤ 8 mm. [22] Battery according to any one of claims 4 to 21, wherein the length of the fourth buffer element in the third direction is d, where 3 mm ≤ d ≤ 8 mm. [23] Battery according to any one of claims 1 to 22, wherein the first buffer element, the second buffer element, the third buffer element and the fourth buffer element together form a closed frame body. [24] Power-consuming device, wherein the power-consuming device comprises a battery according to any one of claims 1 to 23, wherein the battery is designed to supply electrical energy.

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