Battery and electric apparatus

Abstract

The present application belongs to the technical field of batteries. Provided are a battery and an electric apparatus. The battery comprises at least one battery cell group, first busbar components and fasteners, wherein the battery cell group comprises a plurality of battery cells stacked in a first direction, each battery cell comprising a casing, electrode terminals and an electrode assembly, the electrode terminals being disposed on the casing, and the electrode assembly being accommodated in the casing and being electrically connected to the electrode terminals; the first busbar components are electrically connected to electrode terminals of two adjacent battery cells in the same battery cell group; and the fasteners are connected to casings of the plurality of battery cells in the battery cell group. By means of fasteners, when battery cells expand in a first direction, the change in the spacing between electrode terminals of two adjacent battery cells in the first direction can be reduced, such that the torque or tensile force between the electrode terminals and first busbar components is absorbed and shared by the fasteners, which is conducive to reducing the risk of a connection failure between the electrode terminals and the first busbar components.

Description

Batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application 2024208801929 entitled "Battery and Electrical Device", filed on April 25, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and more specifically, to a battery and an electrical device. Background Technology

[0004] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. A battery consists of a casing and individual battery cells housed within it. As a core component of new energy vehicles, the battery has high requirements for both stability and reliability. To achieve a larger capacity or power output, multiple battery cells are typically housed within the casing, connected by a busbar to their terminals. These cells are connected in series or parallel to form a unified unit within the casing. However, existing batteries are prone to connection failures between the busbar and the battery cell terminals during use, affecting the electrical connection between the cells and hindering the improvement of battery stability and reliability.

[0005] Summary of the Invention

[0006] This application provides a battery and an electrical device that can effectively improve the stability and reliability of battery use.

[0007] In a first aspect, embodiments of this application provide a battery, including at least one battery cell group, a first busbar component, and fasteners; the battery cell group includes a plurality of battery cells stacked along a first direction, each battery cell including a housing, electrode terminals, and electrode assemblies, the electrode terminals being disposed in the housing, the electrode assemblies being housed within the housing, and the electrode assemblies being electrically connected to the electrode terminals; the first busbar component is electrically connected to the electrode terminals of two adjacent battery cells in the same battery cell group; the fasteners connect the housings of the plurality of battery cells in the battery cell group.

[0008] In the above technical solution, the electrode terminals of two adjacent battery cells in the same battery cell group are connected by a first busbar to achieve electrical connection between the two adjacent battery cells. This facilitates the input or output of electrical energy from multiple battery cells through series or parallel structures. The battery is also provided with fasteners that connect the shells of multiple battery cells stacked along a first direction in the battery cell group. The fasteners can further reinforce the multiple battery cells stacked along the first direction in the battery cell group, thereby limiting the distance between the electrode terminals of the multiple battery cells in the first direction. This reduces the change in the distance between the electrode terminals of two adjacent battery cells in the first direction when the battery cells expand during use. The fasteners absorb and distribute the torque or tension between the electrode terminals and the first busbar, thereby reducing the pulling phenomenon between the electrode terminals of two adjacent battery cells and the first busbar. This helps to reduce the risk of connection failure between the electrode terminals and the first busbar, thus improving the stability and reliability of the battery.

[0009] In some embodiments, the housing has a wall portion, electrode terminals are disposed on the wall portion, and fasteners are connected to the wall portion.

[0010] In the above technical solution, by setting the electrode terminals on the wall of the outer casing and connecting the outer casing walls of multiple battery cells in the fastener battery cell group, the wall connecting the fastener to the outer casing and the wall on which the electrode terminals are set on the outer casing are the same wall. Thus, even when the battery cell expands along the first direction, the gap opening size on the side where the electrode terminals are set on the multiple battery cells can be effectively limited. This allows the fastener to further reduce the spacing change of the electrode terminals of two adjacent battery cells in the first direction when the battery cell expands along the first direction, thereby further reducing the pulling phenomenon between the electrode terminals of two adjacent battery cells and the first busbar component, which helps to reduce the risk of connection failure between the electrode terminals and the first busbar component.

[0011] In some embodiments, the wall portion is located at one end of the housing in the second direction, and each battery cell assembly is connected to a plurality of fasteners, which are spaced apart along a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other.

[0012] In the above technical solution, the wall of the outer casing is located at one end of the outer casing in the second direction. By setting multiple fasteners for each battery cell group, the multiple battery cells stacked in each battery cell group along the first direction are connected by multiple fasteners, and the multiple fasteners are spaced apart along the third direction. This helps to further improve the constraint effect on the multiple battery cells in the battery cell group when they expand along the first direction. The multiple fasteners absorb and distribute the torque or tension between the electrode terminals and the first busbar component, thereby reducing the pulling phenomenon between the electrode terminals of two adjacent battery cells and the first busbar component, which helps to further reduce the risk of connection failure between the electrode terminals and the first busbar component.

[0013] In some embodiments, a plurality of fasteners are symmetrically arranged on both sides of the mid-section of the wall, with the third direction perpendicular to the mid-section, and the distances from both ends of the wall to the mid-section are equal along the third direction.

[0014] In the above technical solution, the mid-section of the wall is perpendicular to the third direction, and the distance from the mid-section of the wall to both ends of the wall in the third direction is equal. This makes the multiple fasteners symmetrically arranged on both sides of the center position of the wall in the third direction, which helps to improve the structural balance after the multiple fasteners are connected to the battery cell group, so as to improve the force balance of the multiple fasteners when the multiple battery cells of the battery cell group expand along the first direction.

[0015] In some embodiments, the wall portion is located at one end of the housing in the second direction, and at least one fastener covers the mid-section of the wall portion along the second direction. Along the third direction, the distances from both ends of the wall portion to the mid-section are equal, and the third direction is perpendicular to the mid-section. The first direction, the second direction, and the third direction are perpendicular to each other.

[0016] In the above technical solution, the mid-section of the wall is perpendicular to the third direction, and the distance from the mid-section of the wall to both ends of the wall in the third direction is equal. By setting at least one fastener to cover the mid-section of the wall in the second direction, at least one fastener is connected to the center position of the wall in the third direction, which helps to improve the structural balance after the fastener and the battery cell group are interconnected, so as to improve the force balance of the fastener when multiple battery cells in the battery cell group expand along the first direction.

[0017] In some embodiments, the housing includes a housing and an end cap; the interior of the housing forms a receiving cavity with an opening for receiving an electrode assembly; the end cap closes the opening; wherein the end cap is a wall portion.

[0018] In the above technical solution, by setting the wall of the outer casing as an end cap for closing the opening, the battery cell with this structure is easy to assemble electrode terminals on the end cap and can reduce the difficulty of electrical connection between the electrode terminals and the electrode assembly, thereby reducing the manufacturing difficulty of the battery cell and improving the production efficiency of the battery cell.

[0019] In some embodiments, the housing includes a housing and an end cap; the housing includes an integrally formed sidewall and a wall portion, the sidewall surrounding the wall portion, one end of the sidewall being connected to the wall portion along the thickness direction of the wall portion, and the other end forming an opening, the sidewall and the wall portion together defining a receiving cavity for accommodating an electrode assembly; the end cap closes the opening.

[0020] In the above technical solution, by setting the wall of the outer casing as the bottom wall of the casing that is opposite to the end cover in the thickness direction of the wall, the battery cell with this structure can make the area of ​​the outer casing where the electrode terminals are set far away from the end cover. This can effectively alleviate the phenomenon that the pulling or torsional force of the first busbar component on the electrode terminals is directly applied to the end cover, thereby reducing the risk of connection failure between the end cover and the casing. This is beneficial to reducing the risk of leakage during the use of the battery cell, thereby improving the service life and reliability of the battery cell.

[0021] In some embodiments, the fastener extends along a first direction.

[0022] In the above technical solution, by setting the fastener to extend along the first direction, the extension direction of the fastener is the same as the stacking direction of the multiple battery cells in the battery cell group. This facilitates the connection of the fastener to the outer shell of the multiple battery cells in the battery cell group, which helps to reduce the assembly difficulty of the fastener. On the other hand, it can optimize the stress situation of the fastener when the battery cell expands along the first direction, so as to improve the effect of the fastener in absorbing and distributing the torque or tension between the electrode terminal and the first busbar component. This can further reduce the pulling phenomenon between the electrode terminals of two adjacent battery cells and the first busbar component, which helps to further reduce the risk of connection failure between the electrode terminals and the first busbar component, thereby improving the stability and reliability of the battery.

[0023] In some embodiments, the fasteners are bonded to the housing.

[0024] In the above technical solution, the adhesive connection structure is used to connect the fastener and the battery cell shell. On the one hand, it facilitates assembly and reduces the difficulty of connecting the fastener and the battery cell shell. On the other hand, it can ensure that the connection and assembly between the fastener and the battery cell shell does not affect the battery cell, which helps to alleviate the phenomenon of fastener damaging the battery cell.

[0025] In some embodiments, the fasteners are made of insulating material.

[0026] In the above technical solution, by setting the fasteners to insulating materials, the multiple battery cells in the battery cell group will not form a circuit connection through the fasteners, thereby reducing the risk of short circuit between multiple battery cells in the battery cell group and improving the reliability of battery use.

[0027] In some embodiments, along a first direction, the housing has two opposing first outer surfaces, the first outer surface being the surface with the largest area among the outer surfaces of the housing, and the first direction being perpendicular to the first outer surface.

[0028] In the above technical solution, by setting the first outer surface with the largest area in the outer surface of the casing to be perpendicular to the first direction, the first surfaces of the casings of two adjacent battery cells in the battery cell group are arranged facing each other in the first direction. This makes the multiple battery cells in the battery cell group stacked along the thickness direction of the battery cells. Thus, the fasteners can constrain and restrict the multiple battery cells in the battery cell group in the direction of greater expansion, thereby alleviating the pulling phenomenon between the electrode terminals of two adjacent battery cells and the first busbar component in the direction of the greatest expansion of the battery cells. This further helps to reduce the risk of connection failure between the electrode terminals and the first busbar component.

[0029] In some embodiments, the first busbar includes a first main body and two first connecting portions, the first main body being connected between the two first connecting portions, and the two first connecting portions being respectively connected to the electrode terminals of two adjacent battery cells in the same battery cell group; wherein, a first induced deformation portion is formed on the first main body, the first induced deformation portion being configured to reduce the force required for the first main body to deform along a first direction.

[0030] In the above technical solution, the first busbar component is provided with two first connecting parts and a first main body connected between the two first connecting parts. By connecting the two first connecting parts to the electrode terminals of two adjacent battery cells in the same battery cell group, the two adjacent battery cells are electrically connected through the first busbar component. The first induced deformation part is provided on the first main body of the first busbar component, and the first induced deformation part is configured to reduce the force required for the first main body to deform in the first direction, so that the first main body can deform more easily in the first direction under the action of the first induced deformation part. This allows the first main body of the first busbar component to deform when the two adjacent battery cells expand in the first direction, thereby alleviating the torque or tension between the first connecting part of the first busbar component and the electrode terminals of the battery cells. This effectively reduces the risk of connection failure between the electrode terminals and the first connecting part of the first busbar component, thereby improving the stability and reliability of the battery.

[0031] In some embodiments, the battery includes a plurality of battery cell groups arranged along a third direction, which is perpendicular to the first direction; wherein the battery further includes a second busbar component electrically connected to two adjacent battery cell groups.

[0032] In the above technical solution, the battery is provided with multiple battery cell groups arranged along a third direction, and each pair of adjacent battery cell groups are electrically connected through a second busbar component, so as to realize that multiple battery cell groups are connected in series or in parallel to form a whole, which is conducive to improving the battery capacity and realizing a large-capacity battery.

[0033] In some embodiments, along a third direction, a fastener is provided between every two adjacent battery cell groups, and the fastener is connected to the housing of the battery cells in the two adjacent battery cell groups.

[0034] In the above technical solution, by setting a fastener between every two adjacent battery cell groups in the third direction, and connecting the fastener to the outer shell of multiple battery cells in the two adjacent battery cell groups, the battery with this structure can, on the one hand, allow two battery cell groups to share a single fastener. This allows the expansion of multiple battery cells in the two battery cell groups in the first direction to be constrained and limited by a single fastener, thereby reducing the manufacturing cost of the battery. On the other hand, the fastener can also further reinforce two adjacent battery cell groups arranged in the third direction, thereby limiting the distance between the two adjacent battery cell groups in the third direction. This reduces the change in distance between the two adjacent battery cell groups in the third direction when the battery cell groups expand during use. The fastener absorbs and distributes the torque or tension between the battery cell groups and the second busbar component, thereby reducing the pulling phenomenon between the two adjacent battery cell groups and the second busbar component. This helps to reduce the risk of connection failure between the second busbar component and the battery cell groups, thus improving the stability and reliability of the battery.

[0035] In some embodiments, the second busbar includes a second main body and two second connecting portions, the second main body being connected between the two second connecting portions, and the two second connecting portions being electrically connected to two adjacent battery cell groups respectively; wherein, a second induced deformation portion is formed on the second main body, the second induced deformation portion being configured to reduce the force required for the second main body to deform in a third direction.

[0036] In the above technical solution, the second busbar component is provided with two second connecting parts and a second main body connected between the two second connecting parts. By electrically connecting the two second connecting parts to two adjacent battery cell groups respectively, the two adjacent battery cell groups are electrically connected through the second busbar component. The second main body of the second busbar component is provided with a second induced deformation part, which is configured to reduce the force required for the second main body to deform in the third direction. This allows the second main body to deform more easily in the third direction under the action of the second induced deformation part. As a result, the second main body of the second busbar component can deform when the two adjacent battery cell groups expand in the third direction, thereby alleviating the torque or tension between the second connecting parts of the second busbar component and the battery cell groups. This effectively reduces the risk of connection failure between the battery cell groups and the second connecting parts of the second busbar component, thereby improving the stability and reliability of the battery.

[0037] In some embodiments, the battery further includes a housing, the interior of which is formed an assembly space for accommodating a battery cell assembly; wherein the housing includes a first housing body and a second housing body arranged along a first direction, the first housing body and the second housing body overlapping each other and jointly defining the assembly space.

[0038] In the above technical solution, by setting the relative first box body and second box body as a structure arranged along the first direction and covering each other, the arrangement direction of the first box body and the second box body is the same as the stacking direction of the multiple battery cells of the battery cell group, so that the multiple battery cells of the battery cell group are arranged flat in the box body. On the one hand, it is convenient to assemble and helps to reduce the difficulty of assembling the battery cell group in the box body. On the other hand, the fasteners can constrain and limit the multiple battery cells in the battery cell group in the direction of greater expansion, so as to alleviate the pulling phenomenon between the electrode terminals of two adjacent battery cells and the first busbar component in the direction of the greatest expansion of the battery cell.

[0039] Secondly, embodiments of this application also provide an electrical device, including the aforementioned battery cell, which is used to provide electrical energy. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0042] Figure 2 is an exploded view of the battery structure provided in some embodiments of this application;

[0043] Figure 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0044] Figure 4 is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0045] Figure 5 is a schematic diagram of the structure of multiple battery cells in a battery provided in some embodiments of this application;

[0046] Figure 6 is a front view of multiple battery cell groups provided in some embodiments of this application;

[0047] Figure 7 is a partial enlarged view of point A in the multiple battery cell groups of the battery shown in Figure 6;

[0048] Figure 8 is a schematic diagram of the assembly of fasteners and battery cells provided in some embodiments of this application;

[0049] Figure 9 is a schematic diagram of the structure of multiple battery cells of a battery provided in some embodiments of this application;

[0050] Figure 10 is a front view of multiple battery cell groups provided in some embodiments of this application;

[0051] Figure 11 is a schematic diagram of the structure of the first busbar component of the battery provided in some embodiments of this application;

[0052] Figure 12 is a schematic diagram of the structure of the second busbar component of the battery provided in some embodiments of this application.

[0053] Icons: 1000 - Vehicle; 100 - Battery; 10 - Housing; 11 - First Housing Body; 12 - Second Housing Body; 20 - Battery Cell Pack; 21 - Battery Cell; 211 - Housing; 2111 - Wall; 2112 - Housing; 2112a - Opening; 2113 - End Cap; 2114 - First Outer Surface; 212 - Electrode Terminal; 213 - Electrode Assembly; 2131 - Tab; 214 - Current Collector; 30 - First Current Collector; 31 - First Main Body; 311 - First Deformation Induced Part; 32 - First Connecting Part; 40 - Fastener; 50 - Second Current Collector; 51 - Second Main Body; 511 - Second Deformation Induced Part; 52 - Second Connecting Part; 200 - Controller; 300 - Motor; X - First Direction; Y - Second Direction; Z - Third Direction. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0056] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0058] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0059] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0060] In this application, "multiple" means two or more (including two).

[0061] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0062] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0063] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0064] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0065] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0066] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0067] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, at least one of lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co0.25Mn0.25O2 (also abbreviated as NCM211), LiNi0.6Co0.2Mn0.2O2 (also abbreviated as NCM622), LiNi0.8Co0.1Mn0.1O2 (also abbreviated as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.85Co0.15Al0.05O2) and their modified compounds.

[0068] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0069] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0070] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0071] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0072] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0073] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0074] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0075] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0076] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0077] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0078] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0079] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0080] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0081] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0082] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0083] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0084] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0085] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0086] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0087] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0088] In some implementations, the electrode assembly is a stacked structure.

[0089] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0090] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0091] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0092] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0093] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0094] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0095] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0096] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0097] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0098] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0099] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0100] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0101] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0102] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0103] Batteries possess outstanding advantages such as high energy density, low environmental pollution, high power density, long lifespan, wide applicability, and low self-discharge coefficient, making them a crucial component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the stability and reliability of the battery in use must also be taken into account.

[0104] In battery technology, a battery typically consists of a casing and individual battery cells housed within it. To improve battery capacity and power, multiple battery cells are usually stacked within the casing, with corresponding busbars connecting the electrode terminals of these cells. This allows the cells to be connected in series or parallel to form a unified unit within the casing, thereby increasing capacity and power. However, during battery use, as the number of charge-discharge cycles increases, the battery cells expand, causing the gaps between them to widen. This increases the distance between the electrode terminals of adjacent cells, leading to tension between the busbars and the battery cell electrode terminals. This increased torque and tension between the busbars and electrode terminals can easily cause connection failure, affecting the battery's stability and reliability.

[0105] Based on the above considerations, in order to solve the problem of low stability and reliability of batteries, this application provides a battery comprising at least one battery cell group, a first busbar, and fasteners. The battery cell group includes multiple battery cells stacked along a first direction. Each battery cell includes a housing, electrode terminals, and electrode assemblies. The electrode terminals are disposed within the housing, and the electrode assemblies are housed within the housing, electrically connected to the electrode terminals. The first busbar electrically connects the electrode terminals of two adjacent battery cells within the same battery cell group. The fasteners connect the housings of the multiple battery cells in the battery cell group.

[0106] In this battery structure, the electrode terminals of two adjacent battery cells in the same battery cell group are connected through a first busbar to achieve electrical connection between the two adjacent battery cells. This facilitates the input or output of electrical energy from multiple battery cells through series or parallel connections. The battery is also equipped with fasteners that connect the shells of multiple battery cells stacked along a first direction in the battery cell group. The fasteners further reinforce the multiple battery cells stacked along the first direction, thereby limiting the distance between the electrode terminals of the multiple battery cells in the first direction. This reduces the change in the distance between the electrode terminals of two adjacent battery cells in the first direction when the battery cells expand during use. The fasteners absorb and distribute the torque or tension between the electrode terminals and the first busbar, thereby reducing the pulling phenomenon between the electrode terminals of two adjacent battery cells and the first busbar. This helps to reduce the risk of connection failure between the electrode terminals and the first busbar, thus improving the stability and reliability of the battery.

[0107] The battery disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system comprising the battery disclosed in this application can be used to construct such an electrical device. This helps to alleviate the problem of connection failure between the busbar and the electrode terminals of the battery cells during use, thereby improving the stability and reliability of the battery.

[0108] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0109] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0110] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is installed inside the vehicle 1000. The battery 100 can be located at the bottom, front, or 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 power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0111] In some embodiments of this application, the battery 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0112] According to some embodiments of this application, please refer to Figures 2, 3, 4, and 5. Figure 2 is an exploded view of the structure of a battery 100 provided in some embodiments of this application; Figure 3 is a schematic diagram of the structure of a single battery cell 21 provided in some embodiments of this application; Figure 4 is an exploded view of the structure of a single battery cell 21 provided in some embodiments of this application; and Figure 5 is a schematic diagram of the structure of a plurality of battery cell groups 20 of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 10 and at least one battery cell group 20. The battery cell group 20 is used to accommodate within the housing 10, and the battery cell group 20 includes a plurality of battery cells 21 stacked along a first direction X.

[0113] The housing 10 provides assembly space for the battery cell pack 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other along a first direction X, and together define an assembly space for accommodating the battery cell pack 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0114] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in Figure 2, the shape of the box 10 is a cuboid.

[0115] Optionally, in the battery 100, there can be one or more battery cell groups 20 housed within the casing 10. When there are multiple battery cell groups 20 housed within the casing 10, the multiple battery cell groups 20 can be connected in series, parallel, or a combination thereof. A combination thereof means that the multiple battery cell groups 20 are connected in both series and parallel. The multiple battery cell groups 20 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cell groups 20 is housed within the casing 10.

[0116] For example, in Figures 2 and 5, the battery 100 may include a plurality of battery cell groups 20, which are arranged along a third direction Z and connected in series. The third direction Z is perpendicular to the first direction X.

[0117] Referring to Figure 2, each battery cell group 20 includes two battery cells 21 stacked along the first direction X. Of course, in other embodiments, each battery cell group 20 may also include three, four, five, or six battery cells 21 stacked along the first direction X. It should be noted that the multiple battery cells 21 in the battery cell group 20 can be connected in series or in parallel. For example, referring to Figure 5, the multiple battery cells 21 in the battery cell group 20 are connected in series.

[0118] Optionally, each battery cell 21 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 21 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in Figure 3, the battery cell 21 has a cuboid structure.

[0119] According to some embodiments of this application, referring to Figures 2, 3, 4, and 5, and further referring to Figures 6 and 7, Figure 6 is a front view of a plurality of battery cell groups 20 of a battery 100 provided in some embodiments of this application, and Figure 7 is a partial enlarged view of point A of the plurality of battery cell groups 20 of the battery 100 shown in Figure 6. This application provides a battery 100, which includes at least one battery cell group 20, a first busbar 30, and a fastener 40. The battery cell group 20 includes a plurality of battery cells 21 stacked along a first direction X. Each battery cell 21 includes a housing 211, electrode terminals 212, and electrode assemblies 213. The electrode terminals 212 are disposed in the housing 211, and the electrode assemblies 213 are housed within the housing 211 and electrically connected to the electrode terminals 212. The first busbar 30 electrically connects the electrode terminals 212 of two adjacent battery cells 21 in the same battery cell group 20. The fastener 40 connects the housings 211 of the plurality of battery cells 21 in the battery cell group 20.

[0120] The battery 100 includes at least one battery cell group 20. That is, the housing 10 of the battery 100 may contain only one battery cell group 20 or multiple battery cell groups 20. For example, in Figures 2 and 5, the battery 100 includes multiple battery cell groups 20 arranged along the third direction Z.

[0121] The battery cell group 20 includes a plurality of battery cells 21 stacked along the first direction X, that is, each battery cell group 20 is composed of a plurality of battery cells 21 stacked along the first direction X. For example, in FIG6, each battery cell group 20 includes two battery cells 21 stacked along the first direction X.

[0122] The battery cell 21 includes a casing 211, electrode terminals 212, and electrode assembly 213. The electrode assembly 213 is housed within the casing 211. The casing 211 has a wall 2111, and the electrode terminals 212 are insulatedly mounted on the wall 2111. The casing 211 can also contain an electrolyte, such as a liquid electrolyte solution. The casing 211 can have various structural forms. The casing 211 can also be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0123] In some embodiments, the housing 211 may include a housing 2112 and an end cap 2113. The housing 2112 has an internal cavity with an opening 2112a, i.e., the housing 2112 is a hollow structure with one end open. The end cap 2113 covers the opening 2112a of the housing 2112 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 213 and the electrolyte.

[0124] When assembling the battery cell 21, the electrode assembly 213 can be placed into the housing 2112 first, and the electrolyte can be filled into the housing 2112. Then, the end cap 2113 can be placed on the opening 2112a of the housing 2112 to close the opening 2112a of the housing 2112.

[0125] The housing 2112 can have various shapes, such as a cylinder or a cuboid. The shape of the housing 2112 can be determined according to the specific shape of the electrode assembly 213. For example, if the electrode assembly 213 is a cylindrical structure, then the housing 2112 can be a cylindrical structure; if the electrode assembly 213 is a cuboid structure, then the housing 2112 can be a cuboid structure. Of course, the end cap 2113 can also have various structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figures 3 and 4, the housing 2112 is a cuboid structure. The thickness direction of the battery cell 21 is the first direction X, and the electrode terminal 212 is disposed at one end of the housing 211 in the second direction Y.

[0126] Understandably, the housing 211 is not limited to the structure described above. The housing 211 can also be other structures. For example, the housing 211 includes a shell 2112 and two end caps 2113. The shell 2112 is a hollow structure with openings 2112a on opposite sides. One end cap 2113 is fitted onto one opening 2112a of the shell 2112 to form a sealed connection, thereby forming a sealed space for accommodating the electrode assembly 213 and the electrolyte.

[0127] Electrode assembly 213 is a component in battery cell 21 where electrochemical reactions occur. The structure of electrode assembly 213 can be various. For example, electrode assembly 213 can be a wound structure formed by winding positive electrode, separator and negative electrode, or a stacked structure formed by stacking positive electrode, separator and negative electrode.

[0128] For example, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0129] In this electrode assembly 213, a tab 2131 is formed at one end near the wall portion 2111. The tab 2131 is used to input or output the positive or negative electrode of the electrode assembly 213, and is used to connect with the electrode terminal 212 to achieve an electrical connection between the electrode assembly 213 and the electrode terminal 212. It should be noted that the tab 2131 of the electrode assembly 213 is a component formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer, or a component formed by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer. If the tab 2131 is used to output the positive electrode of the electrode assembly 213, then the tab 2131 is a component formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer; if the tab 2131 is used to output the negative electrode of the electrode assembly 213, then the tab 2131 is a component formed by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer.

[0130] Optionally, the electrode assembly 213 housed within the housing 211 can be one or more. For example, in FIG4, the housing 211 of the battery cell 21 is provided with two electrode assemblies 213, which are stacked along the first direction X, that is, the two electrode assemblies 213 are stacked along the thickness direction of the battery cell 21. Of course, in other embodiments, the electrode assembly 213 housed within the housing 211 can be one, three, four, five, six, seven, or eight, etc.

[0131] In this embodiment, the electrode terminal 212 serves to output or input electrical energy of the battery cell 21. One end of the electrode terminal 212 is used to connect to the tab 2131 of the electrode assembly 213, and the other end is used to connect to the first busbar 30 or the second busbar 50, so as to realize the input or output of electrical energy of the battery cell 21.

[0132] It should be noted that the electrode terminal 212 is insulated and mounted on the wall portion 2111 of the housing 211, that is, there is no electrical connection between the electrode terminal 212 and the wall portion 2111 of the housing 211.

[0133] For example, the wall portion 2111 is located at one end of the housing 211 in the second direction Y, that is, the electrode terminal 212 is disposed at one end of the housing 211 in the second direction Y, and the first direction X, the second direction Y and the third direction are perpendicular to each other.

[0134] Optionally, the wall portion 2111 for mounting the electrode terminal 212 can be an end cap 2113 or one of the multiple walls of the housing 2112. Exemplarily, in Figures 3 and 4, the wall portion 2111 is the end cap 2113 of the housing 211. Of course, in other embodiments, the wall portion 2111 can also be the bottom wall of the housing 2112 that is opposite to the end cap 2113 in the second direction Y, or a side wall that is adjacent to and abuts against the end cap 2113.

[0135] In Figures 3 and 4, the battery cell 21 includes two electrode terminals 212, which are spaced apart along a third direction (Z). Correspondingly, each electrode assembly 213 has two tabs 2131, which are also spaced apart along a third direction (Z) and have opposite polarities. The two electrode terminals 212 are electrically connected to the two tabs 2131 of the electrode assembly 213, respectively, to realize the input or output of electrical energy of the battery cell 21. For example, the electrode terminals 212 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0136] In some embodiments, as shown in FIG4, the battery cell 21 may further include two current collectors 214, both of which are disposed within the housing 211. Each current collector 214 is used to connect an electrode terminal 212 and a tab 2131 of the same polarity among a plurality of electrode assemblies 213, so as to realize the electrical connection between the electrode terminal 212 and the electrode assembly 213, which helps to reduce the assembly difficulty between the tab 2131 and the electrode terminal 212.

[0137] For example, the material of the current collector 214 can be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0138] In some embodiments, the battery cell 21 may further include a pressure relief mechanism disposed on the housing 211, which is used to release the internal pressure of the battery cell 21 when the internal pressure or temperature of the battery cell 21 reaches a predetermined value.

[0139] Optionally, the pressure relief mechanism can be disposed on the end cap 2113 of the outer casing 211 or on the housing 2112 of the outer casing 211. Similarly, the pressure relief mechanism and the outer casing 211 can be integrally formed or separately disposed. If the pressure relief mechanism and the outer casing 211 are separately disposed, the pressure relief mechanism can be connected to the outer casing 211 by welding or other means. Correspondingly, the pressure relief mechanism can be a pressure relief component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve or safety valve. If the pressure relief mechanism and the outer casing 211 are integrally formed, the pressure relief mechanism is a region on the outer casing 211 with a weak structure, such as a region on the outer casing 211 with a groove.

[0140] In this embodiment, the first busbar 30 serves to electrically connect two adjacent battery cells 21 in the same battery cell group 20. The first busbar 30 can also realize the series or parallel connection between two adjacent battery cells 21.

[0141] It should be noted that if the first busbar 30 connects to two electrode terminals 212 of the same polarity in two adjacent battery cells 21, then the first busbar 30 connects the two adjacent battery cells 21 in parallel. In the embodiment where the first busbar 30 connects to two adjacent battery cells 21 in the same battery cell group 20 in parallel, the first busbar 30 can also simultaneously connect to electrode terminals 212 of the same polarity in multiple battery cells 21 in the same battery cell group 20 to achieve parallel connection of multiple battery cells 21 in the same battery cell group 20; if the first busbar 30 connects to two electrode terminals 212 of opposite polarity in two adjacent battery cells 21, then the first busbar 30 connects the two adjacent battery cells 21 in series.

[0142] For example, in Figures 6 and 7, the extension direction of the first busbar 30 is set at an angle to both the first direction X and the third direction Z. The first busbar 30 connects the two electrode terminals 212 with opposite polarities in two adjacent battery cells 21 to achieve a series connection between the two adjacent battery cells 21. It should be noted that in Figure 7, if the battery cell group 20 includes two battery cells 21 stacked along the first direction X, then each battery cell group 20 only needs to be provided with one first busbar 30. If the battery cell group 20 includes three, four, or five battery cells 21 stacked along the first direction X, then each pair of adjacent battery cells 21 needs to be connected to a first busbar 30 to achieve a sequential series connection of multiple battery cells 21 in the same battery cell group 20.

[0143] The fastener 40 serves to fasten multiple battery cells 21 of the same battery cell group 20 along the first direction X. The fastener 40 connects the outer shell 211 of multiple battery cells 21 in the battery cell group 20. That is, the outer shell 211 of each battery cell 21 in the same battery cell group 20 is connected to the fastener 40.

[0144] Optionally, each battery cell 20 may be connected to one or more fasteners 40. Similarly, the connection structure between the fastener 40 and the outer casing 211 of the battery cell 21 may be varied, such as adhesive bonding or snap-fit ​​bonding.

[0145] For example, in FIG7, the fastener 40 is a structure that extends along the first direction X. Of course, in other embodiments, the fastener 40 may also be an inclined structure, that is, the extension direction of the fastener 40 is set at an angle to the first direction X.

[0146] In this embodiment, the electrode terminals 212 of two adjacent battery cells 21 in the same battery cell group 20 are connected by the first busbar 30 to realize the electrical connection between the two adjacent battery cells 21. This facilitates the input or output of electrical energy from multiple battery cells 21 through series or parallel structures. The battery 100 is also provided with fasteners 40 that connect the outer shells 211 of the multiple battery cells 21 stacked along the first direction X in the battery cell group 20. The fasteners 40 further reinforce the multiple battery cells 21 stacked along the first direction X in the battery cell group 20, thereby limiting the movement of the multiple battery cells. The distance between the electrode terminals 212 of the body 21 in the first direction X is such that when the battery cell 21 expands along the first direction X during use, the spacing change of the electrode terminals 212 of two adjacent battery cells 21 in the first direction X can be reduced. This allows the fastener 40 to absorb and distribute the torque or tension between the electrode terminals 212 and the first busbar 30, thereby reducing the pulling phenomenon between the electrode terminals 212 of two adjacent battery cells 21 and the first busbar 30. This helps to reduce the risk of connection failure between the electrode terminals 212 and the first busbar 30, thus improving the stability and reliability of the battery 100.

[0147] According to some embodiments of this application, referring to Figures 3, 4, 6 and 7, the housing 211 has a wall portion 2111, electrode terminals 212 are disposed on the wall portion 2111, and fasteners 40 are connected to the wall portion 2111. That is, the fasteners 40 are connected to the wall of the housing 211 of the battery cell 21 where the electrode terminals 212 are disposed.

[0148] For example, the wall portion 2111 is located at one end of the housing 211 in the second direction Y, that is, the electrode terminal 212 is installed at one end of the housing 211 in the second direction Y. Correspondingly, the fastener 40 is located at one end of the battery cell group 20 in the second direction Y, and the wall portions 2111 of the housings 211 of the plurality of battery cells 21 are connected.

[0149] In this embodiment, by setting the electrode terminal 212 on the wall portion 2111 of the housing 211 and connecting the wall portions 2111 of the housing 211 of the multiple battery cells 21 in the battery cell group 20 of the fastener 40, the wall connecting the fastener 40 to the housing 211 and the wall on which the electrode terminal 212 is set on the housing 211 are the same wall. Thus, even when the battery cell 21 expands along the first direction X, the size of the gap opening 2112a on the side of the multiple battery cells 21 where the electrode terminal 212 is set can be effectively limited. This allows the fastener 40 to further reduce the spacing change of the electrode terminals 212 of two adjacent battery cells 21 in the first direction X when the battery cell 21 expands along the first direction X. This further reduces the pulling phenomenon between the electrode terminals 212 of two adjacent battery cells 21 and the first busbar 30, which helps to reduce the risk of connection failure between the electrode terminals 212 and the first busbar 30.

[0150] According to some embodiments of this application, referring to Figures 4, 5, and 7, and further referring to Figure 8, Figure 8 is a schematic diagram of the assembly of fasteners 40 of the battery 100 and the battery cell assembly 20 provided in some embodiments of this application. The wall portion 2111 is located at one end of the housing 211 in the second direction Y, and each battery cell assembly 20 is connected to a plurality of fasteners 40, which are spaced apart along the third direction Z, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other.

[0151] For example, in Figure 8, each battery cell group 20 is connected to two fasteners 40, which are located on opposite sides of the battery cell group 20 in the third direction Z. Of course, in other embodiments, the number of fasteners 40 connected to each battery cell group 20 may be three, four, five, or six, etc.

[0152] In this embodiment, the wall portion 2111 of the outer casing 211 is located at one end of the outer casing 211 in the second direction Y. By providing multiple fasteners 40 for each battery cell group 20, multiple battery cells 21 stacked in each battery cell group 20 along the first direction X are connected by multiple fasteners 40, and the multiple fasteners 40 are spaced apart along the third direction Z. This helps to further improve the constraint effect on the multiple battery cells 21 in the battery cell group 20 when they expand along the first direction X. The multiple fasteners 40 absorb and distribute the torque or tension between the electrode terminal 212 and the first busbar component 30, thereby reducing the pulling phenomenon between the electrode terminal 212 of two adjacent battery cells 21 and the first busbar component 30, which helps to further reduce the risk of connection failure between the electrode terminal 212 and the first busbar component 30.

[0153] In some embodiments, as shown in FIG8, a plurality of fasteners 40 are symmetrically arranged on both sides of the mid-section of the wall portion 2111, with the third direction Z perpendicular to the mid-section. Along the third direction Z, the distances from both ends of the wall portion 2111 to the mid-section are equal.

[0154] The mid-section of the wall portion 2111 is the cross-section of the wall portion 2111 that is perpendicular to the third direction Z and located at the center of the third direction Z.

[0155] Multiple fasteners 40 are symmetrically arranged on both sides of the mid-section of the wall portion 2111, that is, the fasteners 40 located on both sides of the mid-section of the wall portion 2111 in the third direction Z are symmetrically arranged with respect to the mid-section of the wall portion 2111.

[0156] In this embodiment, the mid-section of the wall portion 2111 is perpendicular to the third direction Z, and the distance from the mid-section of the wall portion 2111 to both ends of the wall portion 2111 in the third direction Z is equal. This makes the multiple fasteners 40 symmetrically arranged on both sides of the center position of the wall portion 2111 in the third direction Z, which helps to improve the structural balance after the multiple fasteners 40 are connected to the battery cell group 20, so as to improve the force balance of the multiple fasteners 40 when the multiple battery cells 21 of the battery cell group 20 expand along the first direction X.

[0157] According to some embodiments of this application, referring to Figures 9 and 10, Figure 9 is a structural schematic diagram of a plurality of battery cell groups 20 of a battery 100 provided in some embodiments of this application, and Figure 10 is a front view of a plurality of battery cell groups 20 of a battery 100 provided in some embodiments of this application. A wall portion 2111 is located at one end of the outer casing 211 in the second direction Y. At least one fastener 40 covers the mid-section of the wall portion 2111 along the second direction Y. Along the third direction Z, the distances from both ends of the wall portion 2111 to the mid-section are equal, and the third direction Z is perpendicular to the mid-section. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0158] In this embodiment, at least one fastener 40 covers the mid-section of the wall portion 2111 along the second direction Y. That is, the projection of the mid-section of the wall portion 2111 in the second direction Y is located within at least one fastener 40, such that at least one fastener 40 is connected at the location of the mid-section of the wall portion 2111, so that at least one fastener 40 is connected at the center location of the wall portion 2111 in the third direction Z.

[0159] For example, in FIG10, each battery cell group 20 is connected to only one fastener 40, and the fastener 40 is connected to the position of the mid-section of the wall portion 2111. Of course, in other embodiments, each battery cell group 20 may also be connected to multiple fasteners 40, one of the multiple fasteners 40 is connected to the position of the mid-section of the wall portion 2111, and the other fasteners 40 are respectively located on both sides of the mid-section of the wall portion 2111 in the third direction Z.

[0160] In this embodiment, the mid-section of the wall portion 2111 is perpendicular to the third direction Z, and the distance from the mid-section of the wall portion 2111 to both ends of the wall portion 2111 in the third direction Z is equal. By setting at least one fastener 40 to cover the mid-section of the wall portion 2111 in the second direction Y, at least one fastener 40 is connected to the center position of the wall portion 2111 in the third direction Z, which helps to improve the structural balance after the fastener 40 and the battery cell group 20 are interconnected, so as to improve the force balance of the fastener 40 when the multiple battery cells 21 of the battery cell group 20 expand along the first direction X.

[0161] According to some embodiments of this application, referring to Figures 3 and 4, the housing 211 may include a housing 2112 and an end cap 2113. The interior of the housing 2112 forms a receiving cavity with an opening 2112a for receiving the electrode assembly 213. The end cap 2113 closes the opening 2112a and is a wall portion 2111.

[0162] The end cap 2113 is a wall portion 2111, that is, the electrode terminal 212 is assembled on the end cap 2113, and the fastener 40 is connected to the end cap 2113 of the outer shell 211.

[0163] In this embodiment, by setting the wall portion 2111 of the outer casing 211 as an end cap 2113 for closing the opening 2112a, the battery cell 21 with this structure is convenient to assemble the electrode terminal 212 on the end cap 2113, and can reduce the difficulty of electrically connecting the electrode terminal 212 and the electrode assembly 213, thereby reducing the manufacturing difficulty of the battery cell 21 and improving the production efficiency of the battery cell 21.

[0164] It should be noted that the structure of the battery cell 21 is not limited to this. In other embodiments, the battery cell 21 can also have other structures. For example, the housing 211 may include a shell 2112 and an end cap 2113. The shell 2112 includes an integrally formed sidewall and a wall portion 2111. The sidewall surrounds the wall portion 2111. Along the thickness direction of the wall portion 2111, one end of the sidewall is connected to the wall portion 2111, and the other end forms an opening 2112a. The sidewall and the wall portion 2111 together define a receiving cavity for accommodating the electrode assembly 213. The end cap 2113 closes the opening 2112a. That is, the electrode terminal 212 is assembled on the bottom wall of the shell 2112, which is opposite to the end cap 2113 in the second direction Y, and the fastener 40 is connected to the bottom wall of the shell 2112.

[0165] In this embodiment, by setting the wall portion 2111 of the outer casing 211 as the bottom wall of the casing 2112 opposite to the end cap 2113 in the thickness direction of the wall portion 2111, the battery cell 21 with this structure can ensure that the area of ​​the outer casing 211 where the electrode terminals 212 are provided is far away from the end cap 2113. This can effectively alleviate the phenomenon that the pulling or torsional force of the first busbar component 30 on the electrode terminals 212 is directly applied to the end cap 2113, thereby reducing the risk of connection failure between the end cap 2113 and the casing 2112. This is beneficial to reducing the risk of leakage of the battery cell 21 during use, thereby improving the service life and reliability of the battery cell 21.

[0166] According to some embodiments of this application, referring to Figures 5 and 6, and Figures 9 and 10, the fastener 40 extends along a first direction X. That is, the extension direction of the fastener 40 is consistent with the stacking direction of the plurality of battery cells 21 in the battery cell group 20. Of course, in other embodiments, the extension direction of the fastener 40 may also be set at an angle to the first direction X.

[0167] For example, the fastener 40 is a strip structure extending along the first direction X.

[0168] In this embodiment, by setting the fastener 40 to extend along the first direction X, the extension direction of the fastener 40 is the same as the stacking direction of the multiple battery cells 21 in the battery cell group 20. This facilitates the connection of the fastener 40 to the outer shell 211 of the multiple battery cells 21 in the battery cell group 20, reducing the assembly difficulty of the fastener 40. On the other hand, it optimizes the stress on the fastener 40 when the battery cell 21 expands along the first direction X, thereby improving the effect of the fastener 40 in absorbing and distributing the torque or tension between the electrode terminal 212 and the first busbar component 30. This further reduces the pulling phenomenon between the electrode terminal 212 of two adjacent battery cells 21 and the first busbar component 30, which helps to further reduce the risk of connection failure between the electrode terminal 212 and the first busbar component 30, thereby improving the stability and reliability of the battery 100.

[0169] According to some embodiments of this application, the fastener 40 is bonded to the housing 211.

[0170] For example, the fastener 40 and the housing 211 can be bonded together with adhesive or double-sided tape. It should be noted that in other embodiments, the fastener 40 and the housing 211 can also be interlocked.

[0171] In this embodiment, an adhesive connection is used to connect the fastener 40 and the outer shell 211 of the battery cell 21. This facilitates assembly and reduces the difficulty of connecting the fastener 40 and the outer shell 211 of the battery cell 21. Furthermore, it ensures that the connection and assembly between the fastener 40 and the outer shell 211 of the battery cell 21 does not affect the battery cell 21, thus mitigating the phenomenon of the fastener 40 damaging the battery cell 21.

[0172] According to some embodiments of this application, the fastener 40 is made of insulating material.

[0173] For example, the fastener 40 can also be made of plastic or ceramic. Of course, in other embodiments, the fastener 40 can also be made of metal. If the fastener 40 is made of metal, the fastener 40 and the housing 211 are insulated from each other, that is, the fastener 40 is connected to the housing 211 through other insulating components.

[0174] In this embodiment, by setting the fastener 40 as an insulating material, the multiple battery cells 21 in the battery cell group 20 will not form a circuit connection through the fastener 40, thereby reducing the risk of short circuit between the multiple battery cells 21 in the battery cell group 20 and improving the reliability of the battery 100.

[0175] According to some embodiments of this application, as shown in Figures 3, 4 and 5, along the first direction X, the outer shell 211 has two opposing first outer surfaces 2114, the first outer surface 2114 being the surface with the largest area among the outer surfaces of the outer shell 211, and the first direction X being perpendicular to the first outer surface 2114.

[0176] The outer casing 211 has two opposing first outer surfaces 2114. The first outer surface 2114 is the surface with the largest area among the outer surfaces of the outer casing 211. In other words, the two first outer surfaces 2114 are the outer surfaces of the outer casing 211 on both sides in the thickness direction of the battery cell 21.

[0177] The first direction X is perpendicular to the first outer surface 2114, that is, in the multiple battery cells 21 in the battery cell group 20, the first outer surface 2114 between two adjacent battery cells 21 is arranged facing each other in the first direction X and abutting against each other.

[0178] In this embodiment, by setting the first outer surface 2114 with the largest area on the outer surface of the outer shell 211 to be perpendicular to the first direction X, the first surfaces of the outer shells 211 of two adjacent battery cells 21 in the battery cell group 20 are arranged facing each other in the first direction X. This makes the multiple battery cells 21 in the battery cell group 20 stacked along the thickness direction of the battery cells 21. Thus, the fasteners 40 can constrain and restrict the multiple battery cells 21 in the direction of greater expansion, thereby alleviating the pulling phenomenon between the electrode terminals 212 of the two adjacent battery cells 21 and the first busbar 30 in the direction of the greatest expansion of the battery cells 21. This further helps to reduce the risk of connection failure between the electrode terminals 212 and the first busbar 30.

[0179] According to some embodiments of this application, referring to Figures 5, 6, and 7, and further referring to Figure 11, Figure 11 is a structural schematic diagram of the first busbar component 30 of the battery 100 provided in some embodiments of this application. The first busbar component 30 includes a first main body portion 31 and two first connecting portions 32. The first main body portion 31 is connected between the two first connecting portions 32, and the two first connecting portions 32 are respectively connected to the electrode terminals 212 of two adjacent battery cells 21 in the same battery cell group 20. A first induced deformation portion 311 is formed on the first main body portion 31. The first induced deformation portion 311 is configured to reduce the force required for the first main body portion 31 to deform along the first direction X.

[0180] The first main body 31 is connected between two first connecting parts 32, that is, the two first connecting parts 32 are respectively connected to the two ends of the first main body 31 in the extension direction of the first main body 31.

[0181] The two first connection portions 32 are respectively connected to the electrode terminals 212 of two adjacent battery cells 21 in the same battery cell group 20. That is, one first connection portion 32 of the first busbar component 30 is connected to the electrode terminal 212 of one of the two adjacent battery cells 21, and the other first connection portion 32 is connected to the electrode terminal 212 of the other battery cell 21 in the two adjacent battery cells 21.

[0182] For example, the first connection portion 32 is welded to the electrode terminal 212 of the battery cell 21.

[0183] A first deformation-inducing portion 311 is formed on the first main body portion 31. The first deformation-inducing portion 311 is configured to reduce the force required for the first main body portion 31 to deform along the first direction X. In other words, the first deformation-inducing portion 311 on the first main body portion 31 can increase the ability of the first main body portion 31 to deform along the first direction X, thereby reducing the difficulty of the first main body portion 31 to deform along the first direction X, making it easier for the first main body portion 31 to deform along the first direction X.

[0184] Optionally, the structure of the first induced deformation portion 311 can be various. For example, the first induced deformation portion 311 can be a gap provided on the first main body portion 31, and the gap extends through both sides of the first main body portion 31 along the thickness direction of the first main body portion 31. The first induced deformation portion 311 can also be a groove provided on at least one side of the first main body portion 31 in the width direction of the first main body portion 31. Of course, the first induced deformation portion 311 can also be a curved structure formed on the first main body portion 31, and the curved structure protrudes to at least one side of the first main body portion 31 along the thickness direction of the first main body portion 31.

[0185] For example, in FIG11, the first main body portion 31 includes both a first induced deformation portion 311 forming a gap and a first induced deformation portion 311 forming a bending structure.

[0186] In this embodiment, the first busbar component 30 is provided with two first connecting portions 32 and a first main body portion 31 connected between the two first connecting portions 32. By connecting the two first connecting portions 32 to the electrode terminals 212 of two adjacent battery cells 21 in the same battery cell group 20, the two adjacent battery cells 21 are electrically connected through the first busbar component 30. The first induced deformation portion 311 is provided on the first main body portion 31 of the first busbar component 30, and the first induced deformation portion 311 is configured to reduce the deformation of the first main body portion 31 in the first direction X. The force is applied to make the first main body 31 more easily deform along the first direction X under the action of the first induced deformation part 311, so that the first main body 31 of the first busbar 30 can deform when the two adjacent battery cells 21 expand along the first direction X, thereby relieving the torque or tension between the first connection part 32 of the first busbar 30 and the electrode terminal 212 of the battery cell 21, thereby effectively reducing the risk of connection failure between the electrode terminal 212 and the first connection part 32 of the first busbar 30, and improving the stability and reliability of the battery 100.

[0187] According to some embodiments of this application, referring to Figures 2, 5, and 6, the battery 100 includes a plurality of battery cell groups 20 arranged along a third direction Z, which is perpendicular to the first direction X. The battery 100 also includes a second busbar 50, which electrically connects two adjacent battery cell groups 20.

[0188] In this configuration, in two adjacent battery cell groups 20, one end of the busbar is connected to the electrode terminal 212 of a battery cell 21 in one battery cell group 20, and the other end is connected to the electrode terminal 212 of a battery cell 21 in another battery cell group 20, so as to realize the function of electrically connecting the two adjacent battery cell groups 20 to each other.

[0189] It should be noted that if the second busbar 50 is connected to the two electrode terminals 212 of the same polarity in the two battery cells 21 of two adjacent battery cell groups 20, then the second busbar 50 is connected in parallel to the two adjacent battery cell groups 20; if the second busbar 50 is connected to the two electrode terminals 212 of opposite polarity in the two battery cells 21 of two adjacent battery cell groups 20, then the second busbar 50 is connected in series to the two adjacent battery cell groups 20.

[0190] For example, in Figures 6 and 7, the second busbar 50 extends along the third direction Z. The second busbar 50 connects the two electrode terminals 212 with opposite polarities in the two battery cells 21 of two adjacent battery cell groups 20, and a second busbar 50 is connected between each pair of adjacent battery cell groups 20 to realize a structure in which multiple battery cell groups 20 are connected in series.

[0191] In this embodiment, the battery 100 is provided with a plurality of battery cell groups 20 arranged along the third direction Z, and each pair of adjacent battery cell groups 20 are electrically connected through a second busbar 50, so that the plurality of battery cell groups 20 are connected in series or in parallel to form a whole, which is beneficial to increase the capacity of the battery 100 and realize a large capacity battery 100.

[0192] According to some embodiments of this application, referring to Figures 5, 6, 7, and 8, along the third direction Z, a fastener 40 is provided between every two adjacent battery cell groups 20. The fastener 40 is connected to the housing 211 of the battery cells 21 in the two adjacent battery cell groups 20. That is, between two adjacent battery cell groups 20, a fastener 40 is connected to the housing 211 of multiple battery cells 21 in both battery cell groups 20, so that the fastener 40 located between two adjacent battery cell groups 20 connects not only to the housing 211 of multiple battery cells 21 stacked along the first direction X in the same battery cell group 20, but also to the two adjacent battery cell groups 20.

[0193] In this embodiment, by providing a fastener 40 between every two adjacent battery cell groups 20 along the third direction Z, and by connecting the fastener 40 to the outer casing 211 of multiple battery cells 21 in the two adjacent battery cell groups 20, the battery 100 with this structure can, on the one hand, allow two battery cell groups 20 to share a single fastener 40, thereby constraining and limiting the expansion of multiple battery cells 21 in the first direction X using a single fastener 40, which helps to reduce the manufacturing cost of the battery 100. On the other hand, the fastener 40 can also constrain and limit the expansion of two adjacent battery cells arranged along the third direction Z. Group 20 is further reinforced to limit the distance between two adjacent battery cell groups 20 in the third direction Z. This reduces the change in distance between the two adjacent battery cell groups 20 in the third direction Z when the battery cell group 20 expands during use. The fastener 40 absorbs and distributes the torque or tension between the battery cell group 20 and the second busbar component 50, thereby reducing the pulling phenomenon between the two adjacent battery cell groups 20 and the second busbar component 50. This helps to reduce the risk of connection failure between the second busbar component 50 and the battery cell group 20, thus improving the stability and reliability of the battery 100.

[0194] According to some embodiments of this application, referring to Figures 5, 6, and 7, and further referring to Figure 12, Figure 12 is a structural schematic diagram of the second busbar component 50 of the battery 100 provided in some embodiments of this application. The second busbar component 50 includes a second main body portion 51 and two second connecting portions 52. The second main body portion 51 is connected between the two second connecting portions 52, and the two second connecting portions 52 are electrically connected to two adjacent battery cell groups 20, respectively. A second induced deformation portion 511 is formed on the second main body portion 51. The second induced deformation portion 511 is configured to reduce the force required for the second main body portion 51 to deform along the third direction Z.

[0195] The second main body 51 is connected between two second connecting parts 52, that is, the two second connecting parts 52 are respectively connected to the two ends of the second main body 51 in the extending direction of the second main body 51. For example, the second busbar 50 extends along a third direction Z, and correspondingly, the two second connecting parts 52 are respectively connected to the two ends of the second main body 51 in the third direction Z.

[0196] The two second connection portions 52 are electrically connected to two adjacent battery cell groups 20 respectively. That is, one second connection portion 52 of the second busbar component 50 is connected to the electrode terminal 212 of a battery cell 21 in one of the two adjacent battery cell groups 20, and the other second connection portion 52 is connected to the electrode terminal 212 of a battery cell 21 in another of the two adjacent battery cell groups 20.

[0197] For example, the second connection portion 52 is welded to the electrode terminal 212 of the battery cell 21.

[0198] A second deformation-inducing portion 511 is formed on the second main body portion 51. The second deformation-inducing portion 511 is configured to reduce the force required for the second main body portion 51 to deform along the third direction Z. In other words, the second deformation-inducing portion 511 on the second main body portion 51 can increase the ability of the second main body portion 51 to deform along the third direction Z, thereby reducing the difficulty of the second main body portion 51 to deform along the third direction Z, making it easier for the second main body portion 51 to deform along the third direction Z.

[0199] Optionally, the structure of the second induced deformation portion 511 can be various. For example, the second induced deformation portion 511 can be a gap provided on the second main body portion 51, and the gap extends through both sides of the second main body portion 51 along the thickness direction of the second main body portion 51. The second induced deformation portion 511 can also be a groove provided on at least one side of the second main body portion 51 in the width direction of the first main body portion 31. Of course, the second induced deformation portion 511 can also be a curved structure formed on the second main body portion 51, and the curved structure protrudes to at least one side of the second main body portion 51 along the thickness direction of the second main body portion 51.

[0200] For example, in FIG12, the second main body portion 51 includes both a second induced deformation portion 511 in which a groove is formed on at least one side in the width direction of the second main body portion 51 and a second induced deformation portion 511 in which a bending structure is formed.

[0201] In this embodiment, the second busbar 50 is provided with two second connecting portions 52 and a second main body portion 51 connected between the two second connecting portions 52. By electrically connecting the two second connecting portions 52 to two adjacent battery cell groups 20 respectively, the two adjacent battery cell groups 20 are electrically connected through the second busbar 50. The second main body portion 51 of the second busbar 50 is provided with a second induced deformation portion 511, and the second induced deformation portion 511 is configured to reduce the force required for the second main body portion 51 to deform in the third direction Z. This allows the second main body portion 51 to deform more easily in the third direction Z under the action of the second induced deformation portion 511. As a result, the second main body portion 51 of the second busbar 50 can deform when the two adjacent battery cell groups 20 expand in the third direction Z, thereby alleviating the torque or tension between the second connecting portions 52 of the second busbar 50 and the battery cell groups 20. This effectively reduces the risk of connection failure between the battery cell groups 20 and the second connecting portions 52 of the second busbar 50, thereby improving the stability and reliability of the battery 100.

[0202] According to some embodiments of this application, referring to Figures 2, 5, and 6, the battery 100 may further include a housing 10, the interior of which is formed with an assembly space for accommodating the battery cell pack 20. The housing 10 includes a first housing body 11 and a second housing body 12 arranged along a first direction X, the first housing body 11 and the second housing body 12 overlapping each other and jointly defining the assembly space.

[0203] It should be noted that in some embodiments, the battery 100 may not have a housing 10. The battery 100 includes at least one battery cell group 20, and the battery 100 composed of at least one battery cell group 20 can be directly mounted onto the electrical device to provide power to the electrical device. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0204] In this embodiment, by setting the opposing first box body 11 and second box body 12 to be arranged along the first direction X and covering each other, the arrangement direction of the first box body 11 and the second box body 12 is the same as the stacking direction of the multiple battery cells 21 of the battery cell group 20. This makes the multiple battery cells 21 of the battery cell group 20 lie flat inside the box body 10. On the one hand, this facilitates assembly and reduces the difficulty of assembling the battery cell group 20 inside the box body 10. On the other hand, the fasteners 40 can constrain and restrict the multiple battery cells 21 in the direction of greater expansion, thereby alleviating the pulling phenomenon between the electrode terminals 212 of two adjacent battery cells 21 and the first busbar 30 in the direction of the greatest expansion of the battery cell 21.

[0205] According to some embodiments of this application, this application also provides an electrical device, which includes a battery 100 of any of the above schemes, and the battery 100 is used to provide electrical energy to the electrical device.

[0206] The electrical device can be any of the aforementioned devices or systems that use battery 100.

[0207] According to some embodiments of this application, referring to Figures 2 to 8 and Figures 11 to 12, this application provides a battery 100, which includes a housing 10, a plurality of battery cell groups 20, a first busbar 30, a second busbar 50, and fasteners 40. An assembly space is formed inside the housing 10. The housing 10 includes a first housing body 11 and a second housing body 12 arranged along a first direction X. The first housing body 11 and the second housing body 12 cover each other and jointly define the assembly space. The plurality of battery cell groups 20 are all housed within the assembly space of the housing 10, and the plurality of battery cell groups 20 are arranged along a third direction Z. Each battery cell group 20 includes a plurality of battery cells 21 stacked along the first direction X. Each battery cell 21 includes a housing 211, electrode terminals 212, and electrode assemblies 213. The electrode terminals 212 are disposed in the housing 211, and the electrode assemblies 213 are housed within the housing 211 and electrically connected to the electrode terminals 212. Along the first direction X, the housing 211 has two opposing first outer surfaces 2114, which are the surfaces with the largest area among the outer surfaces of the housing 211. The first direction X is perpendicular to the first outer surface 2114. The housing 211 has a wall portion 2111, which is located at one end of the housing 211 in the second direction Y. The electrode terminal 212 is disposed on the wall portion 2111. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The housing 211 includes a shell 2112 and an end cap 2113. The interior of the shell 2112 forms a receiving cavity with an opening 2112a for accommodating the electrode assembly 213. The end cap 2113 closes the opening 2112a and is part of the wall portion 2111. The first busbar 30 is electrically connected to the electrode terminals 212 of two adjacent battery cells 21 in the same battery cell pack 20. The first busbar 30 includes a first main body 31 and two first connecting portions 32. The first main body 31 is connected between the two first connecting portions 32. The two first connecting portions 32 are respectively connected to the electrode terminals 212 of two adjacent battery cells 21 in the same battery cell group 20. A first induced deformation portion 311 is formed on the first main body 31. The first induced deformation portion 311 is configured to reduce the force required for the first main body 31 to deform along the first direction X. The second busbar 50 extends along the third direction Z and is electrically connected to two adjacent battery cell groups 20. The second busbar 50 includes a second main body 51 and two second connecting portions 52. The second main body 51 is connected between the two second connecting portions 52. The two second connecting portions 52 are respectively electrically connected to two adjacent battery cell groups 20. A second induced deformation portion 511 is formed on the second main body 51. The second induced deformation portion 511 is configured to reduce the force required for the second main body 51 to deform along the third direction Z.Fastener 40 extends along a first direction X and is located on one side of the battery cell group 20 in a second direction Y. Fastener 40 connects to the wall portion 2111 of the outer casing 211 of multiple battery cells 21 in the battery cell group 20. Along a third direction Z, a fastener 40 is provided between every two adjacent battery cell groups 20. The fastener 40 is connected to the wall portion 2111 of the outer casing 211 of the battery cells 21 in the two adjacent battery cell groups 20. The fastener 40 is symmetrically arranged on both sides of the mid-section of the wall portion 2111. The third direction Z is perpendicular to the mid-section, and the distances from both ends of the wall portion 2111 in the third direction Z to the mid-section are equal. Fastener 40 is bonded to the wall portion 2111 of the outer casing 211, and fastener 40 is made of insulating material.

[0208] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0209] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, comprising: At least one battery cell group, the battery cell group comprising a plurality of battery cells stacked along a first direction, the battery cell comprising a housing, electrode terminals and electrode assemblies, the electrode terminals being disposed in the housing, the electrode assemblies being housed within the housing, and the electrode assemblies being electrically connected to the electrode terminals; The first busbar is electrically connected to the electrode terminals of two adjacent battery cells in the same battery cell group; as well as Fasteners that connect the housings of multiple battery cells in the battery cell group.

2. The battery according to claim 1, wherein, The housing has a wall portion, the electrode terminals are disposed on the wall portion, and the fasteners are connected to the wall portion.

3. The battery according to claim 2, wherein, The wall portion is located at one end of the outer casing in the second direction, and each battery cell assembly is connected to a plurality of fasteners, which are spaced apart along a third direction, with the first direction, the second direction, and the third direction being perpendicular to each other.

4. The battery according to claim 3, wherein, Multiple fasteners are symmetrically arranged on both sides of the mid-section of the wall portion, the third direction is perpendicular to the mid-section, and the distances from both ends of the wall portion to the mid-section are equal along the third direction.

5. The battery according to claim 2 or 3, wherein, The wall portion is located at one end of the housing in the second direction, and at least one of the fasteners covers the mid-section of the wall portion along the second direction. Along the third direction, the distances from both ends of the wall portion to the mid-section are equal, and the third direction is perpendicular to the mid-section. The first direction, the second direction, and the third direction are perpendicular to each other.

6. The battery according to any one of claims 2-5, wherein, The outer casing includes: The housing has an internally formed receiving cavity with an opening for accommodating the electrode assembly; End cap, to close the opening; The end cap is the wall portion.

7. The battery according to any one of claims 2-5, wherein, The outer casing includes: The housing includes an integrally formed sidewall and a wall portion, the sidewall surrounding the wall portion, one end of the sidewall being connected to the wall portion along the thickness direction of the wall portion, and the other end forming an opening, the sidewall and the wall portion together defining a receiving cavity for accommodating the electrode assembly; End cap, to close the opening.

8. The battery according to any one of claims 1-7, wherein, The fastener extends along the first direction.

9. The battery according to any one of claims 1-8, wherein, The fasteners are bonded to the outer shell.

10. The battery according to any one of claims 1-9, wherein, The fasteners are made of insulating material.

11. The battery according to any one of claims 1-10, wherein, Along the first direction, the outer shell has two opposing first outer surfaces, the first outer surface being the surface with the largest area among the outer surfaces of the outer shell, and the first direction being perpendicular to the first outer surface.

12. The battery according to any one of claims 1-11, wherein, The first busbar component includes a first main body and two first connecting parts. The first main body is connected between the two first connecting parts, and the two first connecting parts are respectively connected to the electrode terminals of two adjacent battery cells in the same battery cell group. The first main body portion has a first deformation-inducing portion formed thereon, which is configured to reduce the force required for the first main body portion to deform along the first direction.

13. The battery according to any one of claims 1-12, wherein, The battery includes a plurality of battery cells arranged along a third direction, which is perpendicular to the first direction; The battery also includes a second busbar component, which is electrically connected to two adjacent battery cell groups.

14. The battery according to claim 13, wherein, Along the third direction, a fastener is provided between every two adjacent battery cell groups, and the fastener is connected to the housing of the battery cell in the two adjacent battery cell groups.

15. The battery according to claim 13 or 14, wherein, The second busbar component includes a second main body and two second connecting parts. The second main body is connected between the two second connecting parts, and the two second connecting parts are electrically connected to two adjacent battery cell groups respectively. The second main body has a second deformation-inducing portion formed thereon, which is configured to reduce the force required for the second main body to deform along the third direction.

16. The battery according to any one of claims 1-15, wherein, The battery also includes a housing, the interior of which forms an assembly space for accommodating the battery cell assembly. The box body includes a first box body and a second box body arranged along the first direction, and the first box body and the second box body cover each other and jointly define the assembly space.

17. An electrical device comprising a battery as claimed in any one of claims 1-16, the battery being used to provide electrical energy.

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