Battery and electric device

Abstract

The utility model provides a battery and a power utilization device, and belongs to the technical field of batteries. The battery comprises at least one battery monomer group, a first confluence component and a fastener, the battery single body group comprises a plurality of battery single bodies which are arranged in a stacked mode in the first direction, each battery single body comprises a shell, an electrode terminal and an electrode assembly, the electrode terminals are arranged in the shells, the electrode assemblies are contained in the shells, and the electrode assemblies are electrically connected with the electrode terminals. And the first confluence component is electrically connected with electrode terminals of two adjacent battery monomers in the same battery monomer group. The fastener connects the housings of the plurality of battery cells in the battery cell group. The distance change of the electrode terminals of the two adjacent battery monomers in the first direction can be reduced through the fasteners when the battery monomers expand in the first direction, so that the torque or tension between the electrode terminals and the first confluence component can be absorbed and shared through the fasteners; and the risk of connection failure between the electrode terminal and the first confluence component can be reduced.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and a battery cell contained in the box. As a core component of new energy vehicles, batteries have high requirements in terms of stability and reliability. Among them, in order to achieve a large capacity or power of the battery, a plurality of battery cells are generally arranged in the battery box, and the electrode terminals of the plurality of battery cells are connected by a busbar, so that the plurality of battery cells are formed into a whole in the box in at least one of series and parallel connection modes. However, the existing battery is prone to connection failure between the busbar and the electrode terminal of the battery cell during use, which affects the electrical connection between the plurality of battery cells, which is not conducive to improving the stability and reliability of the battery. Utility Model Content

[0003] The embodiments of the present application provide a battery and an electrical device, which can effectively improve the stability and reliability of the battery.

[0004] In a first aspect, an embodiment of the present application provides a battery, comprising at least one battery cell group, a first busbar and a fastener; the battery cell group comprises a plurality of battery cells stacked along a first direction, the battery cells comprising a housing, an electrode terminal and an electrode assembly, the electrode terminal being arranged in the housing, the electrode assembly being accommodated in the housing, and the electrode assembly being electrically connected to the electrode terminal; the first busbar electrically connects the electrode terminals of two adjacent battery cells in the same battery cell group; the fastener connects the housings of a plurality of battery cells in the battery cell group.

[0005] In the above technical scheme, the electrode terminals of two adjacent battery cells in the same battery cell group are connected through a first busbar component to achieve electrical connection between the two adjacent battery cells, thereby facilitating the input or output of electrical energy of multiple battery cells through a series or parallel structure, wherein the battery is also provided with a fastener connecting the outer shells of multiple battery cells stacked along a first direction in the battery cell group, so that the multiple battery cells stacked along the first direction in the battery cell group can be further reinforced through the fastener, thereby limiting the distance between the electrode terminals of the multiple battery cells in the first direction, so that when the battery cell expands along the first direction during use, the change in the spacing between the electrode terminals of the two adjacent battery cells in the first direction can be reduced, so that the torque or tension between the electrode terminal and the first busbar component can be absorbed and distributed by the fastener, thereby reducing the pulling phenomenon between the electrode terminals of the two adjacent battery cells and the first busbar component, which is beneficial to reducing the risk of connection failure between the electrode terminal and the first busbar component, so as to improve the stability and reliability of the battery.

[0006] In some embodiments, the housing has a wall portion, the electrode terminal is disposed on the wall portion, and the fastener is connected to the wall portion.

[0007] In the above technical solution, by setting the electrode terminal on the wall of the shell, and connecting the wall of the shell of multiple battery cells in the fastener battery cell group, the wall where the fastener is connected to the shell and the wall on which the electrode terminal is set on the shell are the same wall, so that even when the battery cell expands along the first direction, the gap opening size on the side where the electrode terminals are set of the multiple battery cells can be effectively limited, so that the fastener can further reduce the change in the spacing between the electrode terminals of two adjacent battery cells in the first direction when the battery cell expands along the first direction, and further reduce the pulling phenomenon between the electrode terminals of two adjacent battery cells and the first busbar component, which is beneficial to reduce the risk of connection failure between the electrode terminal and the first busbar component.

[0008] In some embodiments, the wall portion is located at one end of the housing in the second direction, and each battery cell group is connected to a plurality of fasteners, the plurality of fasteners are arranged at intervals along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0009] In the above technical solution, the wall portion of the shell is located at one end of the shell in the second direction, and multiple fasteners are provided for each battery cell group, so that the multiple battery cells stacked along the first direction in each battery cell group are connected by multiple fasteners, and the multiple fasteners are arranged at intervals along the third direction, which is beneficial to further enhance the restraint effect on the multiple battery cells in the battery cell group when they expand along the first direction, so that the torque or tension between the electrode terminal and the first busbar component can be absorbed and distributed by multiple fasteners, thereby further reducing the pulling phenomenon between the electrode terminals of two adjacent battery cells and the first busbar component, which is beneficial to further reduce the risk of connection failure between the electrode terminal and the first busbar component.

[0010] In some embodiments, the plurality of fasteners are symmetrically arranged on both sides of a mid-section of the wall portion, the third direction is perpendicular to the mid-section, and along the third direction, the distances from both ends of the wall portion to the mid-section are equal.

[0011] In the above technical solution, the middle section of the wall portion is perpendicular to the third direction, and the distance from the middle section of the wall portion to the two ends of the wall portion in the third direction is equal, so that the multiple fasteners are symmetrically arranged on both sides of the center position of the wall portion in the third direction, which is beneficial 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.

[0012] In some embodiments, the wall portion is located at one end of the shell in the second direction, at least one fastener covers the mid-section of the wall portion along the second direction, and 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, and the first direction, the second direction and the third direction are perpendicular to each other.

[0013] In the above technical solution, the middle section of the wall portion is perpendicular to the third direction, and the distance from the middle section of the wall portion to the two ends of the wall portion in the third direction is equal. By setting at least one fastener to cover the middle section of the wall portion in the second direction, so that at least one fastener is connected to the center position of the wall portion in the third direction, it is beneficial to improve the structural balance after the fastener and the battery cell group are connected to each other, so as to improve the force balance of the fastener when multiple battery cells in the battery cell group expand along the first direction.

[0014] In some embodiments, the housing includes a shell and an end cover; a receiving cavity with an opening is formed inside the shell, and the receiving cavity is used to receive the electrode assembly; the end cover closes the opening; wherein the end cover is a wall portion.

[0015] In the above technical solution, by setting the wall portion of the shell as an end cover for closing the opening of the shell, the battery cell adopting this structure is convenient for assembling the electrode terminal on the end cover, and can reduce the difficulty of electrically connecting the electrode terminal and the electrode assembly to each other, thereby helping to reduce the manufacturing difficulty of the battery cell and improve the production efficiency of the battery cell.

[0016] In some embodiments, the outer shell includes a shell and an end cover; the shell includes an integrally formed side wall and a wall portion, the side wall is arranged around the wall portion, and along the thickness direction of the wall portion, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, and the side wall and the wall portion jointly define a accommodating cavity for accommodating the electrode assembly; the end cover closes the opening.

[0017] In the above technical solution, by setting the wall portion of the shell as a bottom wall of the shell that is arranged opposite to the end cover in the thickness direction of the wall portion, the battery cell adopting this structure can realize that the area of ​​the shell where the electrode terminal is arranged is away from the end cover, thereby effectively alleviating the phenomenon that the force of the first busbar component pulling or twisting the electrode terminal directly acts on the end cover, so as to reduce the risk of connection failure between the end cover and the shell, and further help to reduce the risk of leakage of the battery cell during use, so as to improve the service life and reliability of the battery cell.

[0018] In some embodiments, the fastener extends along a first direction.

[0019] In the above technical scheme, by setting the fastener as a structure extending 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 makes it easier for the fastener to connect the outer shells of the multiple battery cells in the battery cell group, which is beneficial to reducing the difficulty of assembling the fastener. On the other hand, it can optimize the stress condition of the fastener when the battery cell expands along the first direction, so as to enhance the effect of the fastener in absorbing and distributing the torque or tension between the electrode terminal and the first busbar component, thereby further reducing the pulling phenomenon between the electrode terminals of two adjacent battery cells and the first busbar component, which is beneficial to further reduce the risk of connection failure between the electrode terminal and the first busbar component, so as to improve the stability and reliability of the battery.

[0020] In some embodiments, the fastener is adhesively coupled to the housing.

[0021] In the above technical solution, a bonding connection structure is used to connect the fastener and the outer shell of the battery cell. On the one hand, it is easy to assemble and helps to reduce the difficulty of connecting the fastener and the outer shell of the battery cell. On the other hand, it can achieve the connection and assembly between the fastener and the outer shell of the battery cell without affecting the battery cell, which helps to alleviate the phenomenon of fasteners damaging the battery cell.

[0022] In some embodiments, the fastener is made of insulating material.

[0023] In the above technical solution, by setting the fastener to an insulating material, multiple battery cells in the battery cell group will not form a circuit connection through the fastener, thereby reducing the risk of short circuit between multiple battery cells in the battery cell group, which is beneficial to improving the reliability of battery use.

[0024] In some embodiments, along the first direction, the housing has two opposite first outer surfaces, the first outer surface is the surface with the largest area among the outer surfaces of the housing, and the first direction is perpendicular to the first outer surfaces.

[0025] In the above technical solution, by setting the first outer surface with the largest area among the outer surfaces of the outer shell to a structure perpendicular to the first direction, the first surfaces of the outer shells of two adjacent battery cells in the battery cell group are structures facing each other in the first direction, so that the multiple battery cells in the battery cell group are structures stacked along the thickness direction of the battery cells, so that the multiple battery cells in the battery cell group can be constrained and restricted in the direction of greater expansion by fasteners, so as to alleviate the pulling phenomenon between the electrode terminals of the two adjacent battery cells and the first busbar component in the direction of the greatest expansion of the battery cells, which is conducive to further reducing the risk of connection failure between the electrode terminals and the first busbar component.

[0026] In some embodiments, 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; wherein a first induced deformation part is formed on the first main body, and the first induced deformation part is configured to reduce the force required for the first main body to deform along the first direction.

[0027] 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, and the two first connecting parts are respectively connected to the electrode terminals of two adjacent battery cells in the same battery cell group to realize electrical connection between the two adjacent battery cells through the first busbar component, wherein a 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 be more easily deformed along the first direction under the action of the first induced deformation part, so that the first main body of the first busbar component can be deformed when the two adjacent battery cells expand along the first direction, so as to alleviate the torque or tension between the first connecting part of the first busbar component and the electrode terminal of the battery cell, thereby effectively reducing the risk of connection failure between the electrode terminal and the first connecting part of the first busbar component, so as to improve the stability and reliability of the battery.

[0028] In some embodiments, the battery includes a plurality of battery cell groups arranged along a third direction, the third direction being perpendicular to the first direction; wherein the battery further includes a second busbar component, the second busbar component electrically connecting two adjacent battery cell groups.

[0029] In the above technical solution, the battery is provided with a plurality of battery cell groups arranged along a third direction, and each two adjacent battery cell groups are electrically connected through a second busbar component to realize that the plurality of battery cell groups are connected in series or in parallel to form a whole, which is beneficial to improving the capacity of the battery and realizing a large-capacity battery.

[0030] In some embodiments, along the third direction, a fastener is disposed between every two adjacent battery cell groups, and the fastener is connected to outer shells of battery cells of the two adjacent battery cell groups.

[0031] In the above technical scheme, a fastener is provided between each two adjacent battery cell groups in the third direction, and the fastener is connected to the outer shells of multiple battery cells in the two adjacent battery cell groups. The battery adopting this structure can, on the one hand, realize that the two battery cell groups share one fastener, so that the expansion of multiple battery cells in the two battery cell groups in the first direction can be constrained and limited by one fastener, which is beneficial to reducing the manufacturing cost of the battery. On the other hand, the two battery cell groups arranged along the third direction and adjacent to each other can be further reinforced by the fastener, so that the distance between the two adjacent battery cell groups in the third direction can be limited, so that when the battery cell group expands along the third direction during use, the change in the distance between the two adjacent battery cell groups in the third direction can be reduced, so that the torque or pulling force between the battery cell group and the second convergence component can be absorbed and distributed by the fastener, thereby reducing the pulling phenomenon between the two adjacent battery cell groups and the second convergence component, which is beneficial to reducing the risk of connection failure between the second convergence component and the battery cell group, so as to improve the stability and reliability of the battery.

[0032] In some embodiments, 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 respectively electrically connected to two adjacent battery cell groups; wherein a second induced deformation part is formed on the second main body, and the second induced deformation part is configured to reduce the force required for the second main body to deform along a third direction.

[0033] 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, and the two second connecting parts are electrically connected to two adjacent battery cell groups respectively, so as to realize electrical connection of the two adjacent battery cell groups through the second busbar component, wherein, a second induced deformation part is provided on the second main body of the second busbar component, and the second induced deformation part is configured to reduce the force required for the second main body to deform in a third direction, so that the second main body can be more easily deformed along the third direction under the action of the second induced deformation part, so that the second main body of the second busbar component can be deformed when the two adjacent battery cell groups expand along the third direction, so as to alleviate the torque or tension between the second connecting part of the second busbar component and the battery cell group, thereby effectively reducing the risk of connection failure between the battery cell group and the second connecting part of the second busbar component, so as to improve the stability and reliability of battery use.

[0034] In some embodiments, the battery also includes a box body, the interior of which forms an assembly space for accommodating a battery cell group; wherein the box body includes a first box body and a second box body arranged along a first direction, the first box body and the second box body cover each other and jointly define the assembly space.

[0035] In the above technical solution, by arranging the relative first box body and the second box body into a structure arranged along a 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 easy 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 the two adjacent battery cells and the first busbar component in the direction of the maximum expansion of the battery cells.

[0036] In a second aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0039] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0040] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0041] Figure 4 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0042] Figure 5 A schematic diagram of the structure of multiple battery cell groups of batteries provided in some embodiments of the present application;

[0043] Figure 6 A front view of a plurality of battery cell groups of a battery provided in some embodiments of the present application;

[0044] Figure 7 for Figure 6 A partial enlarged view of a plurality of battery cell groups at A of the battery shown;

[0045] Figure 8 A schematic diagram of assembling a fastener and a battery cell group of a battery provided in some embodiments of the present application;

[0046] Fig. 9 A schematic diagram of the structure of multiple battery cell groups of batteries provided in some other embodiments of the present application;

[0047] Fig.10 A front view of a plurality of battery cell groups of a battery provided in some other embodiments of the present application;

[0048] Fig.11 A schematic structural diagram of a first current collecting component of a battery provided in some embodiments of the present application;

[0049] Fig.12 A schematic structural diagram of a second busbar component of a battery provided in some embodiments of the present application.

[0050] Icons: 1000-vehicle; 100-battery; 10-casing; 11-first casing body; 12-second casing body; 20-battery cell group; 21-battery cell; 211-casing; 2111-wall; 2112-shell; 2112a-opening; 2113-end cover; 2114-first outer surface; 212-electrode terminal; 213-electrode assembly; 2131-ear; 214-current collecting member; 30-first current collecting part; 31-first main body; 311-first induced deformation part; 32-first connecting part; 40-fastener; 50-second current collecting part; 51-second main body; 511-second induced deformation part; 52-second connecting part; 200-controller; 300-motor; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0053] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0056] In the embodiments of the present application, the same reference numerals represent 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 the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0057] The term "plurality" used in the present application refers to two or more (including two).

[0058] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0059] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0060] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0061] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet 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.

[0062] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0063] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, 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. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may 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.).

[0064] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional 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. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (also referred to as NCM523), LiNi0.5Co0.25Mn0.25O2 (also referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (also referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (also referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.85Co0.15Al0.05O2) and at least one of their modified compounds.

[0065] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0066] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0067] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may 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.).

[0068] 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.

[0069] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0070] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. 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, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0071] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0072] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0073] In some embodiments, the separator is a separator membrane. There may be many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability may be selected.

[0074] As an example, the material of the separator may include at least one of glass fiber, non-woven 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 may be attached to the surface of the positive and negative electrodes.

[0075] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0076] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0077] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0078] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0079] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0080] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0081] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0082] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0083] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0084] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0085] In some embodiments, the electrode assembly is a laminate structure.

[0086] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0087] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0088] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0089] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0090] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0091] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0092] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0093] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0094] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes but is not limited to a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc.

[0095] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0096] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0097] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0098] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0099] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0100] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. The development of battery technology must consider many design factors at the same time, such as performance parameters such as energy density, cycle life, discharge capacity, and charge and discharge rate. In addition, the stability and reliability of the battery also need to be considered.

[0101] In battery technology, a battery generally includes a housing and a battery cell disposed in the housing. In order to improve the capacity and power of the battery, a plurality of battery cells are generally arranged in a stacked manner in the housing of the battery, and a busbar is correspondingly disposed in the housing. The electrode terminals of the plurality of battery cells are connected through the busbar to achieve electrical connection between the plurality of battery cells, so that the plurality of battery cells are formed into a whole and contained in the housing in at least one connection mode of series connection and parallel connection, thereby improving the capacity and power of the battery. However, during the use of the battery, as the number of charge and discharge times of the battery cell increases, the battery cell will swell, which will cause the gap opening between the battery cell to become larger, so that the distance between the electrode terminals of two adjacent battery cells becomes larger, and a pulling phenomenon occurs between the busbar and the electrode terminals of the battery cell, which in turn causes the torque and tension between the busbar and the electrode terminals to increase, and it is very easy for the busbar to fail to connect with the electrode terminal, affecting the stability and reliability of the battery.

[0102] Based on the above considerations, in order to solve the problem of low stability and reliability of battery use, an embodiment of the present application provides a battery, which includes at least one battery cell group, a first busbar and a fastener. The battery cell group includes a plurality of battery cells stacked along a first direction, and the battery cell includes a shell, an electrode terminal and an electrode assembly, the electrode terminal is arranged in the shell, the electrode assembly is accommodated in the shell, and the electrode assembly is electrically connected to the electrode terminal. The first busbar electrically connects the electrode terminals of two adjacent battery cells in the same battery cell group. The fastener connects the shells of multiple battery cells in the battery cell group.

[0103] In a battery of this structure, the electrode terminals of two adjacent battery cells in the same battery cell group are connected by a first busbar component to achieve electrical connection between the two adjacent battery cells, thereby facilitating the input or output of electrical energy of multiple battery cells through a series or parallel structure, wherein the battery is also provided with a fastener connecting the outer shells of multiple battery cells stacked along a first direction in the battery cell group, so that the multiple battery cells stacked along the first direction in the battery cell group can be further reinforced by the fastener, thereby limiting the distance between the electrode terminals of the multiple battery cells in the first direction, so that when the battery cells expand along the first direction during use, the change in the spacing between the electrode terminals of the two adjacent battery cells in the first direction can be reduced, so that the torque or tension between the electrode terminals and the first busbar component can be absorbed and distributed by the fastener, thereby reducing the pulling phenomenon between the electrode terminals of the two adjacent battery cells and the first busbar component, which is beneficial to reducing the risk of connection failure between the electrode terminals and the first busbar component, so as to improve the stability and reliability of the battery.

[0104] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery disclosed in the present application can be used to form the electrical device, which is helpful to alleviate the problem of connection failure between the busbar and the electrode terminal of the battery cell during use, thereby improving the stability and reliability of the battery.

[0105] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0106] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0107] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source or a power source for the vehicle 1000, etc. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0108] In some embodiments of the present application, the battery 100 can not only serve as an operating power source or a use power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0109] According to some embodiments of this application, please refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 2 The structure explosion diagram of the battery 100 provided in some embodiments of the present application is shown in FIG. Figure 3 This is a schematic diagram of the structure of a battery cell 21 provided in some embodiments of the present application. Figure 4 This is an exploded view of the structure of a battery cell 21 provided in some embodiments of the present application. Figure 5 The schematic diagram of the structure of multiple battery cell groups 20 of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and at least one battery cell group 20, the battery cell group 20 is used to be accommodated in the box 10, and the battery cell group 20 includes a plurality of battery cells 21 stacked along a first direction X.

[0110] The box body 10 is used to provide an assembly space for the battery cell group 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 overlap each other along the first direction X, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell group 20. The second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 may also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0111] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube. Figure 2 In the embodiment, the box body 10 is in the shape of a rectangular parallelepiped.

[0112] Optionally, in the battery 100, the battery cell group 20 accommodated in the box 10 may be one or more. When there are multiple battery cell groups 20 arranged in the box 10, the multiple battery cell groups 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cell groups 20 are both connected in series and in parallel. The multiple battery cell groups 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cell groups 20 is accommodated in the box 10.

[0113] For example, in Figure 2 and Figure 5 In the embodiment, the battery 100 may include a plurality of battery cell groups 20, the plurality of battery cell groups 20 are arranged along a third direction Z, and the plurality of battery cell groups 20 are sequentially connected in series. The third direction Z is perpendicular to the first direction X.

[0114] See also Figure 2 As shown, each battery cell group 20 includes two battery cells 21 stacked along a 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 may be connected in series or in parallel. For example, see Figure 5 As shown, a plurality of battery cells 21 in the battery cell group 20 are sequentially connected in series.

[0115] Optionally, each battery cell 21 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 21 may be in a rectangular parallelepiped, a cylinder, a prism or other shapes. Figure 3 In the figure, the battery cell 21 is a rectangular parallelepiped structure.

[0116] According to some embodiments of the present application, referring to Figure 2 , Figure 3 , Figure 4 and Figure 5 , and please refer to Figure 6 and Figure 7 , Figure 6 A front view of a plurality of battery cell groups 20 of a battery 100 provided in some embodiments of the present application, Figure 7 for Figure 6 A partial enlarged view of the A of multiple battery cell groups 20 of the battery 100 shown. The present 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, the battery cell 21 includes a housing 211, an electrode terminal 212 and an electrode assembly 213, the electrode terminal 212 is disposed in the housing 211, the electrode assembly 213 is accommodated in the housing 211, and the electrode assembly 213 is electrically connected to the electrode terminal 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 multiple battery cells 21 in the battery cell group 20.

[0117] The battery 100 includes at least one battery cell group 20, that is, the box 10 of the battery 100 may be provided with only one battery cell group 20, or may be provided with multiple battery cells. Figure 2 and Figure 5 In the embodiment, the battery 100 includes a plurality of battery cell groups 20 arranged along a third direction Z.

[0118] The battery cell group 20 includes a plurality of battery cells 21 stacked along a first direction X. That is, each battery cell group 20 is composed of a plurality of battery cells 21 stacked along a first direction X. For example, Figure 6 In the embodiment, each battery cell group 20 includes two battery cells 21 stacked along a first direction X.

[0119] The battery cell 21 includes a housing 211, an electrode terminal 212 and an electrode assembly 213. The electrode assembly 213 is contained in the housing 211. The housing 211 has a wall 2111, and the electrode terminal 212 is insulated and mounted on the wall 2111. The housing 211 can also be used to contain electrolytes, such as electrolytes. The housing 211 can be in various structural forms. The material of the housing 211 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0120] In some embodiments, the housing 211 may include a shell 2112 and an end cap 2113, wherein a accommodating cavity is formed inside the shell 2112, and the accommodating cavity has an opening 2112a, that is, the shell 2112 is a hollow structure with one end open, and the end cap 2113 covers the opening 2112a of the shell 2112 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 213 and the electrolyte.

[0121] When assembling the battery cell 21 , the electrode assembly 213 may be placed in the housing 2112 first, and the housing 2112 may be filled with electrolyte. The end cap 2113 may then be placed on the opening 2112 a of the housing 2112 to seal the opening 2112 a of the housing 2112 .

[0122] The shell 2112 can be in various shapes, such as a cylinder, a cuboid, etc. The shape of the shell 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, the shell 2112 can be a cylindrical structure; if the electrode assembly 213 is a cuboid structure, the shell 2112 can be a cuboid structure. Of course, the end cap 2113 can also be a variety of structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 3 and Figure 4 In the embodiment, the shell 2112 is a rectangular parallelepiped structure. The thickness direction of the battery cell 21 is a first direction X, and the electrode terminal 212 is disposed at one end of the shell 211 in a second direction Y.

[0123] It is understandable that the outer shell 211 is not limited to the above structure, and the outer shell 211 may also be other structures. For example, the outer shell 211 includes a shell body 2112 and two end caps 2113. The shell body 2112 is a hollow structure with openings 2112a on opposite sides. One end cap 2113 corresponds to an opening 2112a of the shell body 2112 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 213 and the electrolyte.

[0124] The electrode assembly 213 is a component in the battery cell 21 where electrochemical reactions occur. The structure of the electrode assembly 213 can be various. For example, the electrode assembly 213 can be a wound structure formed by winding a positive electrode sheet, an isolation member, and a negative electrode sheet, or it can be a stacked structure formed by stacking a positive electrode sheet, an isolation member, and a negative electrode sheet.

[0125] Exemplarily, the isolation member is an isolation membrane, and a main material of the isolation membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0126] Among them, a pole ear 2131 is formed at one end of the electrode assembly 213 close to the wall portion 2111. The pole ear 2131 is used to input or output the positive electrode or negative electrode of the electrode assembly 213. The pole ear 2131 is used to connect to the electrode terminal 212 to achieve electrical connection between the electrode assembly 213 and the electrode terminal 212. It should be noted that the pole ear 2131 of the electrode assembly 213 is a component formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer or a component formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer. If the pole ear 2131 is used to output the positive electrode of the electrode assembly 213, the pole ear 2131 is a component formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if the pole ear 2131 is used to output the negative electrode of the electrode assembly 213, the pole ear 2131 is a component formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer.

[0127] Optionally, the number of electrode assemblies 213 contained in the housing 211 may be one or more. Figure 4 In the embodiment, the outer shell 211 of the battery cell 21 is provided with two electrode assemblies 213, and the two electrode assemblies 213 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 assemblies 213 accommodated in the outer shell 211 can be one, three, four, five, six, seven or eight, etc.

[0128] In the embodiment of the present application, the electrode terminal 212 serves to output or input the electrical energy of the battery cell 21. One end of the electrode terminal 212 is used to connect to the pole ear 2131 of the electrode assembly 213, and the other end is used to connect to the first busbar component 30 or the second busbar component 50 to realize the input or output of the electrical energy of the battery cell 21.

[0129] It should be noted that the electrode terminal 212 is insulated and installed on the wall portion 2111 of the housing 211 , that is, no electrical connection is formed between the electrode terminal 212 and the wall portion 2111 of the housing 211 .

[0130] Exemplarily, 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.

[0131] Optionally, the wall portion 2111 for mounting the electrode terminal 212 may be an end cap 2113 or one of the multiple walls of the housing 2112. Figure 3 and Figure 4 In the figure, the wall portion 2111 is the end cover 2113 of the shell 211. Of course, in other embodiments, the wall portion 2111 may also be the bottom wall of the shell 2112 arranged opposite to the end cover 2113 in the second direction Y or the side wall adjacent to and abutting against the end cover 2113.

[0132] Among them, Figure 3 and Figure 4 In the embodiment, the battery cell 21 includes two electrode terminals 212, which are arranged at intervals along the third direction Z. Correspondingly, each electrode assembly 213 has two pole ears 2131, which are arranged at intervals along the third direction Z, and the polarities of the two pole ears 2131 are opposite. The two electrode terminals 212 are electrically connected to the two pole ears 2131 of the electrode assembly 213, respectively, to realize the input or output of electric energy of the battery cell 21. Exemplarily, the material of the electrode terminal 212 can also be multiple, for example, the material of the electrode terminal 212 can be copper, iron, aluminum, steel or aluminum alloy.

[0133] In some embodiments, see Figure 4 As shown, the battery cell 21 may also include two current collecting components 214, both of which are arranged in the outer shell 211, and each current collecting component 214 is used to connect an electrode terminal 212 and a plurality of electrode assemblies 213 with the same polarity of the pole lug 2131, so as to realize the electrical connection between the electrode terminal 212 and the electrode assembly 213, which is conducive to reducing the difficulty of assembly between the pole lug 2131 and the electrode terminal 212.

[0134] Exemplarily, the material of the current collecting component 214 may be various, for example, the material of the current collecting component 214 may be copper, iron, aluminum, steel or aluminum alloy.

[0135] In some embodiments, the battery cell 21 may further include a pressure relief mechanism, which is disposed on the housing 211 and is used to release the pressure inside the battery cell 21 when the internal pressure or temperature of the battery cell 21 reaches a predetermined value.

[0136] Optionally, the pressure relief mechanism may be disposed on the end cover 2113 of the housing 211, or may be disposed on the shell 2112 of the housing 211. Similarly, the pressure relief mechanism and the housing 211 may be an integrally formed structure, or may be a separately provided structure. If the pressure relief mechanism and the housing 211 are a separate structure, the pressure relief mechanism may be connected to the housing 211 by welding or the like, and correspondingly, the pressure relief mechanism may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, or a safety valve; if the pressure relief mechanism and the housing 211 are an integrally formed structure, the pressure relief mechanism is an area on the housing 211 where a weak structure is formed, for example, an area on the housing 211 where a notched groove is provided.

[0137] In the embodiment of the present application, 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 connection or parallel connection between the two adjacent battery cells 21 .

[0138] It should be noted that if the first busbar component 30 connects two electrode terminals 212 of the same polarity in two adjacent battery cells 21, the first busbar component 30 connects the two adjacent battery cells 21 in parallel. In the embodiment where the first busbar component 30 connects two adjacent battery cells 21 in the same battery cell group 20 in parallel, the first busbar component 30 can also be simultaneously connected to the electrode terminals 212 of the same polarity in multiple battery cells 21 of the same battery cell group 20 to achieve parallel connection of multiple battery cells 21 of the same battery cell group 20; if the first busbar component 30 connects two electrode terminals 212 of opposite polarities in two adjacent battery cells 21, the first busbar component 30 connects the two adjacent battery cells 21 in series.

[0139] For example, in Figure 6 and Figure 7 In the embodiment, the extension direction of the first busbar 30 is set at an angle with the first direction X and the third direction Z. The first busbar 30 connects two electrode terminals 212 of opposite polarities in two adjacent battery cells 21 to achieve the series connection of the two adjacent battery cells 21. Figure 7 In the embodiment, the battery cell group 20 includes two battery cells 21 stacked along a first direction X, then each battery cell group 20 only needs to be provided with one first busbar component 30; if the battery cell group 20 includes three, four or five battery cells 21 stacked along the first direction X, then each two adjacent battery cells 21 need to be connected to a first busbar component 30 to achieve sequential series connection of multiple battery cells 21 of the same battery cell group 20.

[0140] The fastener 40 fastens the multiple battery cells 21 of the same battery cell group 20 along the first direction X. The fastener 40 connects the outer shells 211 of the 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 .

[0141] Optionally, the number of fasteners 40 corresponding to each battery cell group 20 may be one or more. Similarly, the connection structure between the fastener 40 and the housing 211 of the battery cell 21 may be various, such as bonding or clamping.

[0142] For example, in Figure 7 In the embodiment, the fastener 40 is a structure extending along the first direction X. Of course, in other embodiments, the fastener 40 may also be a structure arranged obliquely, that is, the extension direction of the fastener 40 is arranged at an angle to the first direction X.

[0143] 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, so as to facilitate the input or output of the electric energy of the plurality of battery cells 21 through the series or parallel structure, wherein the battery 100 is further provided with a fastener 40 for connecting the outer shells 211 of the plurality of battery cells 21 stacked along the first direction X in the battery cell group 20, so that the plurality of battery cells 21 stacked along the first direction X in the battery cell group 20 can be further reinforced by the fastener 40, thereby limiting the plurality of battery cells The distance between the electrode terminals 212 of the battery cell 21 in the first direction X can reduce the change in the spacing between 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 during use, so that the torque or tension between the electrode terminals 212 and the first busbar component 30 can be absorbed and distributed by the fastener 40, thereby reducing the pulling phenomenon between the electrode terminals 212 of the two adjacent battery cells 21 and the first busbar component 30, which is beneficial to reducing the risk of connection failure between the electrode terminals 212 and the first busbar component 30, so as to improve the stability and reliability of the battery 100.

[0144] According to some embodiments of the present application, see Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the housing 211 has a wall portion 2111, the electrode terminal 212 is disposed on the wall portion 2111, and the fastener 40 is connected to the wall portion 2111. That is, the fastener 40 is connected to the wall of the housing 211 of the battery cell 21 where the electrode terminal 212 is disposed.

[0145] Exemplarily, the wall portion 2111 is located at one end of the outer shell 211 in the second direction Y, that is, the electrode terminal 212 is installed at one end of the outer shell 211 in the second direction Y, and 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 outer shell 211 of multiple battery cells 21 are connected.

[0146] In the present embodiment, the electrode terminal 212 is disposed on the wall portion 2111 of the outer shell 211, and the fastener 40 is connected to the wall portion 2111 of the outer shell 211 of the plurality of battery cells 21 in the battery cell group 20, so that the wall where the fastener 40 is connected to the outer shell 211 and the wall where the electrode terminal 212 is disposed on the outer shell 211 are the same wall, thereby effectively limiting the size of the gap opening 2112a on the side where the electrode terminal 212 is disposed on the plurality of battery cells 21 even when the battery cell 21 expands along the first direction X, so that the fastener 40 can further reduce the change in the spacing between 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, thereby further reducing the pulling phenomenon between the electrode terminals 212 of the two adjacent battery cells 21 and the first busbar component 30, which is beneficial to reducing the risk of connection failure between the electrode terminal 212 and the first busbar component 30.

[0147] According to some embodiments of the present application, referring to Figure 4 , Figure 5 and Figure 7 , and please refer to Figure 8 , Figure 8 Schematic diagram of assembly of fasteners 40 and battery cell groups 20 of batteries 100 provided in some embodiments of the present application. The wall portion 2111 is located at one end of the housing 211 in the second direction Y, and each battery cell group 20 is connected with a plurality of fasteners 40, and the plurality of fasteners 40 are arranged at intervals along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0148] For example, in Figure 8 In the embodiment, each battery cell group 20 is connected to two fasteners 40, and the two fasteners 40 are respectively located on both sides of the battery cell group 20 in the third direction Z. Of course, in other embodiments, the number of fasteners 40 corresponding to each battery cell group 20 may also be three, four, five or six.

[0149] In the present embodiment, the wall portion 2111 of the outer shell 211 is located at one end of the outer shell 211 in the second direction Y, and a plurality of fasteners 40 are provided for each battery cell group 20, so that a plurality of battery cells 21 stacked along the first direction X in each battery cell group 20 are connected by a plurality of fasteners 40, and the plurality of fasteners 40 are arranged at intervals along the third direction Z, thereby facilitating further enhancing the restraining effect on the plurality of battery cells 21 in the battery cell group 20 when they expand along the first direction X, so that the torque or pulling force between the electrode terminal 212 and the first busbar component 30 can be absorbed and distributed by the plurality of fasteners 40, thereby further reducing the pulling phenomenon between the electrode terminal 212 of two adjacent battery cells 21 and the first busbar component 30, and facilitating further reducing the risk of connection failure between the electrode terminal 212 and the first busbar component 30.

[0150] In some embodiments, see Figure 8 As shown, a plurality of fasteners 40 are symmetrically arranged on both sides of the middle section of the wall portion 2111 , the third direction Z is perpendicular to the middle section, and along the third direction Z, the distances from both ends of the wall portion 2111 to the middle section are equal.

[0151] The mid-section of the wall portion 2111 is a cross section of the wall portion 2111 that is perpendicular to the third direction Z and located at the center position in the third direction Z.

[0152] The plurality of fasteners 40 are symmetrically arranged on both sides of the middle section of the wall portion 2111 , that is, the fasteners 40 located on both sides of the middle section of the wall portion 2111 in the third direction Z are symmetrically arranged with respect to the middle section of the wall portion 2111 .

[0153] In this embodiment, the middle section of the wall portion 2111 is perpendicular to the third direction Z, and the distance from the middle section of the wall portion 2111 to the two ends of the wall portion 2111 in the third direction Z is equal, so that the multiple fasteners 40 are symmetrically arranged on both sides of the center position of the wall portion 2111 in the third direction Z, which is beneficial to improve the structural balance after the multiple fasteners 40 and the battery cell group 20 are interconnected, 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.

[0154] According to some embodiments of the present application, referring to Fig. 9 and Fig.10 , Fig. 9 Schematic diagram of the structure of multiple battery cell groups 20 of a battery 100 provided in some embodiments of the present application, Fig.10It is a front view of a plurality of battery cell groups 20 of a battery 100 provided in some other embodiments of the present application. The wall portion 2111 is located at one end of the housing 211 in the second direction Y, and at least one fastener 40 covers the middle 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 middle section are equal, and the third direction Z is perpendicular to the middle section, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0155] In which, 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, so that at least one fastener 40 is connected to the position where the mid-section of the wall portion 2111 is located, so that at least one fastener 40 is connected to the center position of the wall portion 2111 in the third direction Z.

[0156] For example, in Fig.10 In the embodiment, each battery cell group 20 is connected to only one fastener 40, and the fastener 40 is connected to the position of the middle 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 fastener 40 among the multiple fasteners 40 is connected to the position of the middle section of the wall portion 2111, and the other fasteners 40 are respectively located on both sides of the middle section of the wall portion 2111 in the third direction Z.

[0157] In this embodiment, the middle section of the wall portion 2111 is perpendicular to the third direction Z, and the distances from the middle section of the wall portion 2111 to the two ends of the wall portion 2111 in the third direction Z are equal. By setting at least one fastener 40 to cover the middle section of the wall portion 2111 in the second direction Y, so that at least one fastener 40 is connected to the center position of the wall portion 2111 in the third direction Z, it is beneficial to improve the structural balance of the fastener 40 and the battery cell group 20 after being connected to each other, 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.

[0158] According to some embodiments of the present application, see Figure 3 and Figure 4 As shown, the housing 211 may include a shell 2112 and an end cap 2113. The shell 2112 has an accommodation cavity with an opening 2112a formed inside, and the accommodation cavity is used to accommodate the electrode assembly 213. The end cap 2113 closes the opening 2112a, and the end cap 2113 is a wall portion 2111.

[0159] The end cover 2113 is a wall portion 2111 , that is, the electrode terminal 212 is assembled on the end cover 2113 , and the fastener 40 is connected to the end cover 2113 of the housing 211 .

[0160] In this embodiment, by setting the wall portion 2111 of the outer shell 211 as the end cover 2113 of the outer shell 211 for closing the opening 2112a, the battery cell 21 adopting this structure is convenient for assembling the electrode terminal 212 on the end cover 2113, and can reduce the difficulty of electrically connecting the electrode terminal 212 and the electrode assembly 213 to each other, thereby helping to reduce the manufacturing difficulty of the battery cell 21 and improve the production efficiency of the battery cell 21.

[0161] It should be noted that the structure of the battery cell 21 is not limited thereto. In other embodiments, the battery cell 21 may also be other structures. For example, the housing 211 may include a shell 2112 and an end cap 2113. The shell 2112 includes an integrally formed side wall and a wall portion 2111. The side wall is arranged around the wall portion 2111. Along the thickness direction of the wall portion 2111, one end of the side wall is connected to the wall portion 2111, and the other end is enclosed to form an opening 2112a. The side wall and the wall portion 2111 jointly define a receiving cavity for accommodating the electrode assembly 213, and the end cap 2113 closes the opening 2112a. In other words, the electrode terminal 212 is assembled on the bottom wall of the shell 2112 that is arranged 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.

[0162] In this embodiment, by setting the wall portion 2111 of the outer shell 211 as the bottom wall of the shell 2112 which is arranged opposite to the end cover 2113 in the thickness direction of the wall portion 2111, the battery cell 21 adopting this structure can realize that the area of ​​the outer shell 211 where the electrode terminal 212 is arranged is away from the end cover 2113, thereby effectively alleviating the phenomenon that the force of the first busbar component 30 pulling or twisting the electrode terminal 212 directly acts on the end cover 2113, so as to reduce the risk of connection failure between the end cover 2113 and the shell 2112, which is beneficial to reduce the risk of leakage of the battery cell 21 during use, so as to improve the service life and reliability of the battery cell 21.

[0163] According to some embodiments of the present application, see Figure 5 and Figure 6 as well as Fig. 9 and Fig.10 As shown, the fastener 40 extends along the 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.

[0164] Exemplarily, the fastener 40 is a strip-shaped structure extending along the first direction X.

[0165] In the present embodiment, by setting the fastener 40 as a structure extending 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, so that on the one hand, it is convenient for the fastener 40 to connect the shells 211 of the multiple battery cells 21 in the battery cell group 20, which is beneficial to reduce the assembly difficulty of the fastener 40, and on the other hand, it can optimize the stress of the fastener 40 when the battery cell 21 expands along the first direction X, so as to enhance 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, thereby further reducing the pulling phenomenon between the electrode terminal 212 of two adjacent battery cells 21 and the first busbar component 30, which is beneficial to further reduce the risk of connection failure between the electrode terminal 212 and the first busbar component 30, so as to improve the stability and reliability of the battery 100.

[0166] According to some embodiments of the present application, the fastener 40 is adhesively connected to the housing 211 .

[0167] Exemplarily, the fastener 40 and the housing 211 may be bonded together by glue or double-sided tape, etc. It should be noted that, in other embodiments, the fastener 40 and the housing 211 may also be in a mutually clamped structure.

[0168] In this embodiment, an adhesive connection structure is used to connect the fastener 40 and the outer shell 211 of the battery cell 21. On the one hand, it is easy to assemble and helps to reduce the difficulty of connecting the fastener 40 and the outer shell 211 of the battery cell 21. On the other hand, it can achieve the connection and assembly between the fastener 40 and the outer shell 211 of the battery cell 21 without affecting the battery cell 21, which helps to alleviate the phenomenon of the fastener 40 damaging the battery cell 21.

[0169] According to some embodiments of the present application, the fastener 40 is made of insulating material.

[0170] Exemplarily, the material of the fastener 40 may also be plastic or ceramic, etc. Of course, in other embodiments, the fastener 40 may also be made of metal. If the fastener 40 is made of metal, the fastener 40 and the housing 211 are insulated and connected, that is, the fastener 40 is connected to the housing 211 through other insulating components.

[0171] In this embodiment, by setting the fastener 40 to 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, which is beneficial to improving the reliability of the battery 100.

[0172] According to some embodiments of the present application, see Figure 3 , Figure 4 and Figure 5 As shown, along the first direction X, the housing 211 has two opposite first outer surfaces 2114 . The first outer surface 2114 is the surface with the largest area among the outer surfaces of the housing 211 . The first direction X is perpendicular to the first outer surface 2114 .

[0173] The shell 211 has two opposite first outer surfaces 2114 , which are the outer surfaces with the largest area of ​​the shell 211 . That is, the two first outer surfaces 2114 are the outer surfaces on both sides of the shell 211 in the thickness direction of the battery cell 21 .

[0174] The first direction X is perpendicular to the first outer surface 2114 , that is, among the plurality of battery cells 21 in the battery cell group 20 , the first outer surfaces 2114 between two adjacent battery cells 21 are arranged facing each other in the first direction X and abutting against each other.

[0175] In the present embodiment, by setting the first outer surface 2114 with the largest area among the outer surfaces of the outer shell 211 to a structure 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 structures facing each other in the first direction X, so that the multiple battery cells 21 in the battery cell group 20 are structures stacked along the thickness direction of the battery cells 21, so that the multiple battery cells 21 in the battery cell group 20 can be constrained and restricted in the direction of greater expansion by the fasteners 40, so as to alleviate the pulling phenomenon between the electrode terminals 212 of the two adjacent battery cells 21 and the first busbar component 30 in the direction of the maximum expansion of the battery cells 21, which is conducive to further reducing the risk of connection failure between the electrode terminals 212 and the first busbar component 30.

[0176] According to some embodiments of the present application, referring to Figure 5 , Figure 6 and Figure 7 , and please refer to Fig.11 , Fig.11 A schematic diagram of the structure of the first current collector 30 of the battery 100 provided in some embodiments of the present application. The first current collector 30 includes a first main body 31 and two first connecting parts 32, the first main body 31 is connected between the two first connecting parts 32, and the two first connecting parts 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 part 311 is formed on the first main body 31, and the first induced deformation part 311 is configured to reduce the force required for the first main body 31 to deform along the first direction X.

[0177] The first main body portion 31 is connected between the two first connection portions 32 , that is, the two first connection portions 32 are respectively connected to two ends of the first main body portion 31 in the extending direction of the first main body portion 31 .

[0178] 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 battery cell 21 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 of the two adjacent battery cells 21.

[0179] Exemplarily, the first connection portion 32 is connected to the electrode terminal 212 of the battery cell 21 by welding.

[0180] A first induced deformation portion 311 is formed on the first main body portion 31, and 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. That is, the first induced deformation 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, so as to reduce the difficulty of the first main body portion 31 to deform along the first direction X, so that the first main body portion 31 is more easily deformed along the first direction X.

[0181] Optionally, the structure of the first induced deformation portion 311 can also be various. For example, the first induced deformation portion 311 can be a slit provided on the first main body portion 31, and the slit penetrates 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 toward at least one side of the first main body portion 31 along the thickness direction of the first main body portion 31.

[0182] For example, in Fig.11 In the embodiment, the first main body portion 31 includes both the first induced deformation portion 311 forming a gap and the first induced deformation portion 311 forming a curved structure.

[0183] In this embodiment, the first busbar 30 is provided with two first connecting parts 32 and a first main body 31 connected between the two first connecting parts 32, and the two first connecting parts 32 are respectively connected to the electrode terminals 212 of two adjacent battery cells 21 in the same battery cell group 20, so that the two adjacent battery cells 21 are electrically connected through the first busbar 30, wherein the first induced deformation part 311 is provided on the first main body 31 of the first busbar 30, and the first induced deformation part 311 is configured to reduce the deformation of the first main body 31 in the first direction X. force, so that the first main body 31 can be more easily deformed along the first direction X under the action of the first induced deformation portion 311, so that the first main body 31 of the first busbar component 30 can be deformed when two adjacent battery cells 21 expand along the first direction X, so as to alleviate the torque or tension between the first connecting portion 32 of the first busbar component 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 connecting portion 32 of the first busbar component 30, so as to improve the stability and reliability of the battery 100.

[0184] According to some embodiments of the present application, see Figure 2 , Figure 5 and Figure 6 As shown, 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 further includes a second busbar 50 , which electrically connects two adjacent battery cell groups 20 .

[0185] Among them, in two adjacent battery cell groups 20, one end of the busbar component 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.

[0186] It should be noted that if the second busbar component 50 connects two electrode terminals 212 of the same polarity in two battery cells 21 of two adjacent battery cell groups 20, the second busbar component 50 connects the two adjacent battery cell groups 20 in parallel; if the second busbar component 50 connects two electrode terminals 212 of opposite polarity in two battery cells 21 of two adjacent battery cell groups 20, the second busbar component 50 connects the two adjacent battery cell groups 20 in series.

[0187] For example, in Figure 6 and Figure 7In the figure, the second busbar component 50 extends along the third direction Z, and the second busbar component 50 connects two electrode terminals 212 with opposite polarities in two battery cells 21 of two adjacent battery cell groups 20, and a second busbar component 50 is connected between each two adjacent battery cell groups 20 to realize a structure in which multiple battery cell groups 20 are connected in series in sequence.

[0188] In this embodiment, the battery 100 is provided with a plurality of battery cell groups 20 arranged along a third direction Z, and each two adjacent battery cell groups 20 are electrically connected via a second busbar component 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 improving the capacity of the battery 100 and realizing a large-capacity battery 100.

[0189] According to some embodiments of the present application, see Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, along the third direction Z, a fastener 40 is disposed between each two adjacent battery cell groups 20, and the fastener 40 is connected to the outer shells 211 of the battery cells 21 of the two adjacent battery cell groups 20. That is, between two adjacent battery cell groups 20, one fastener 40 is connected to the outer shells 211 of the multiple battery cells 21 in the two battery cell groups 20, so that the fastener 40 between the two adjacent battery cell groups 20 connects both the outer shells 211 of the multiple battery cells 21 stacked along the first direction X in the same battery cell group 20 and the two adjacent battery cell groups 20.

[0190] In this embodiment, a fastener 40 is provided between each two adjacent battery cell groups 20 in the third direction Z, and the fastener 40 is connected to the shells 211 of the multiple battery cells 21 in the two adjacent battery cell groups 20. The battery 100 with such a structure can, on the one hand, realize that the two battery cell groups 20 share one fastener 40, so that the expansion of the multiple battery cells 21 of the two battery cell groups 20 in the first direction X can be constrained and limited by the one fastener 40, thereby helping to reduce the manufacturing cost of the battery 100. On the other hand, the fastener 40 can also be used to constrain and limit the expansion of the multiple battery cells 21 of the two battery cell groups 20 arranged along the third direction Z and adjacent to each other. The group 20 is further reinforced so as to limit the distance between two adjacent battery cell groups 20 in the third direction Z, so that when the battery cell group 20 expands along the third direction Z during use, the change in the distance between the two adjacent battery cell groups 20 in the third direction Z can be reduced, so that the torque or tension between the battery cell group 20 and the second bus component 50 can be absorbed and distributed through the fastener 40, thereby reducing the pulling phenomenon between the two adjacent battery cell groups 20 and the second bus component 50, which is beneficial to reducing the risk of connection failure between the second bus component 50 and the battery cell group 20, so as to improve the stability and reliability of the battery 100.

[0191] According to some embodiments of the present application, referring to Figure 5 , Figure 6 and Figure 7 , and please refer to Fig.12 , Fig.12 A schematic diagram of the structure of the second busbar component 50 of the battery 100 provided in some embodiments of the present application. The second busbar component 50 includes a second main body 51 and two second connecting parts 52, the second main body 51 is connected between the two second connecting parts 52, and the two second connecting parts 52 are respectively electrically connected to two adjacent battery cell groups 20. A second induced deformation part 511 is formed on the second main body 51, and the second induced deformation part 511 is configured to reduce the force required for the second main body 51 to deform along the third direction Z.

[0192] The second body portion 51 is connected between the two second connection portions 52, that is, the two second connection portions 52 are respectively connected to the two ends of the second body portion 51 in the extension direction of the second body portion 51. Exemplarily, the second confluence component 50 extends along the third direction Z, and correspondingly, the two second connection portions 52 are respectively connected to the two ends of the second body portion 51 in the third direction Z.

[0193] 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 battery cell group 20 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 the other battery cell group 20 of the two adjacent battery cell groups 20.

[0194] Exemplarily, the second connection portion 52 is connected to the electrode terminal 212 of the battery cell 21 by welding.

[0195] A second induced deformation portion 511 is formed on the second main body portion 51, and 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. That is, the second induced deformation 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, so as to reduce 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.

[0196] Optionally, the structure of the second induced deformation portion 511 can also be various. For example, the second induced deformation portion 511 can be a slit provided on the second main body portion 51, and the slit penetrates 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 toward at least one side of the second main body portion 51 along the thickness direction of the second main body portion 51.

[0197] For example, in Fig.12 In the embodiment, the second body portion 51 includes both the second inducing deformation portion 511 forming a groove on at least one side in the width direction of the second body portion 51 and the second inducing deformation portion 511 forming a curved structure.

[0198] In the present embodiment, the second busbar 50 is provided with two second connection parts 52 and a second main body part 51 connected between the two second connection parts 52. The two second connection parts 52 are electrically connected to two adjacent battery cell groups 20 respectively, so that the two adjacent battery cell groups 20 are electrically connected through the second busbar 50. The second induced deformation part 511 is provided on the second main body part 51 of the second busbar 50, and the second induced deformation part 511 is configured to reduce the force required for the second main body part 51 to deform in the third direction Z, so that the second main body part 51 can be more easily deformed along the third direction Z under the action of the second induced deformation part 511, so that the second main body part 51 of the second busbar 50 can be deformed when the two adjacent battery cell groups 20 expand along the third direction Z, so as to alleviate the torque or tension between the second connection part 52 of the second busbar 50 and the battery cell group 20, thereby effectively reducing the risk of connection failure between the battery cell group 20 and the second connection part 52 of the second busbar 50, so as to improve the use stability and reliability of the battery 100.

[0199] According to some embodiments of the present application, see Figure 2 , Figure 5 and Figure 6 As shown, the battery 100 may further include a box body 10, and an assembly space for accommodating the battery cell group 20 is formed inside the box body 10. The box body 10 includes a first box body 11 and a second box body 12 arranged along a first direction X, and the first box body 11 and the second box body 12 cover each other and jointly define an assembly space.

[0200] It should be noted that, in some embodiments, the battery 100 may not be provided with a box 10, and 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 assembled on an electrical device, thereby providing electrical energy to the electrical device. In other words, the box 10 can be used as a part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the box 10 can be used as a part of the chassis structure of the vehicle 1000. For example, a part of the box 10 can become at least a part of the floor of the vehicle 1000, or a part of the box 10 can become at least a part of the crossbeam and longitudinal beam of the vehicle 1000.

[0201] In the present embodiment, by setting the relative first box body 11 and the second box body 12 to be arranged along the first direction X and overlapped with 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 plurality of battery cells 21 of the battery cell group 20, so that the plurality of battery cells 21 of the battery cell group 20 are arranged flat in the box body 10, which is convenient for assembly and helps to reduce the difficulty of assembling the battery cell group 20 in the box body 10. On the other hand, the fasteners 40 can constrain and limit the plurality of battery cells 21 in the battery cell group 20 in the direction of greater expansion, so as to alleviate the pulling phenomenon between the electrode terminals 212 of the two adjacent battery cells 21 and the first busbar component 30 in the direction of the maximum expansion of the battery cell 21.

[0202] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery 100 of any of the above solutions, and the battery 100 is used to provide electrical energy to the electrical device.

[0203] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0204] According to some embodiments of the present application, see Figures 2 to 8 as well as Figure 11 to Figure 12As shown, the present application provides a battery 100, which includes a case 10, a plurality of battery cell groups 20, a first busbar 30, a second busbar 50 and a fastener 40. An assembly space is formed inside the case 10, and the case 10 includes a first case body 11 and a second case body 12 arranged along a first direction X, and the first case body 11 and the second case body 12 cover each other and jointly define an assembly space. A plurality of battery cell groups 20 are all accommodated in the assembly space of the case 10, and a plurality of battery cell groups 20 are arranged along a third direction Z. The battery cell group 20 includes a plurality of battery cells 21 stacked along the first direction X, and the battery cell 21 includes a shell 211, an electrode terminal 212 and an electrode assembly 213, the electrode terminal 212 is arranged in the shell 211, the electrode assembly 213 is accommodated in the shell 211, and the electrode assembly 213 is electrically connected to the electrode terminal 212. Along the first direction X, the shell 211 has two opposite first outer surfaces 2114, the first outer surface 2114 is the surface with the largest area among the outer surfaces of the shell 211, and the first direction X is perpendicular to the first outer surface 2114. The shell 211 has a wall portion 2111, the wall portion 2111 is located at one end of the shell 211 in the second direction Y, and the electrode terminal 212 is arranged on the wall portion 2111. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The shell 211 includes a shell 2112 and an end cover 2113, the interior of the shell 2112 forms a receiving cavity with an opening 2112a, the receiving cavity is used to receive the electrode assembly 213, the end cover 2113 closes the opening 2112a, and the end cover 2113 is the wall portion 2111. The first busbar 30 electrically connects the electrode terminals 212 of two adjacent battery cells 21 in the same battery cell group 20. The first busbar 30 includes a first main body 31 and two first connecting parts 32, the first main body 31 is connected between the two first connecting parts 32, the two first connecting parts 32 are respectively connected to the electrode terminals 212 of two adjacent battery cells 21 in the same battery cell group 20, and a first induced deformation part 311 is formed on the first main body 31, and the first induced deformation part 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 the second busbar 50 electrically connects two adjacent battery cell groups 20. The second busbar 50 includes a second main body 51 and two second connecting parts 52, the second main body 51 is connected between the two second connecting parts 52, and the two second connecting parts 52 are respectively electrically connected to two adjacent battery cell groups 20, and a second induced deformation part 511 is formed on the second main body 51, and the second induced deformation part 511 is configured to reduce the force required for the second main body 51 to deform along the third direction Z. The fastener 40 extends along the first direction X and is located at one side of the battery cell group 20 in the second direction Y. The fastener 40 connects the wall portions 2111 of the housings 211 of the plurality of battery cells 21 in the battery cell group 20 .Along the third direction Z, a fastener 40 is provided between each two adjacent battery cell groups 20, and the fastener 40 is connected to the wall portion 2111 of the outer shell 211 of the battery cells 21 of the two adjacent battery cell groups 20, and the fasteners 40 are symmetrically arranged on both sides of the middle section of the wall portion 2111, the third direction Z is perpendicular to the middle section, and the distances from both ends of the wall portion 2111 in the third direction Z to the middle section are equal. The fastener 40 is bonded to the wall portion 2111 of the outer shell 211, and the fastener 40 is made of insulating material.

[0205] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0206] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: include: at least one battery cell group, the battery cell group comprising a plurality of battery cells stacked in a first direction, the battery cells comprising a housing, an electrode terminal and an electrode assembly, the electrode terminal being disposed in the housing, the electrode assembly being accommodated in the housing, and the electrode assembly being electrically connected to the electrode terminal; A first busbar component electrically connects the electrode terminals of two adjacent battery cells in the same battery cell group; as well as A fastener connects the housings of a plurality of the battery cells in the battery cell group.

2. The battery according to claim 1, characterized in that The housing has a wall portion, the electrode terminal is disposed on the wall portion, and the fastener is connected to the wall portion.

3. The battery according to claim 2, characterized in that The wall portion is located at one end of the housing in the second direction, and each of the battery cell groups is connected to a plurality of the fasteners, which are arranged at intervals along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

4. The battery according to claim 3, characterized in that The plurality of fasteners are symmetrically arranged on both sides of the middle section of the wall portion, the third direction is perpendicular to the middle section, and along the third direction, the distances from both ends of the wall portion to the middle section are equal.

5. The battery according to claim 2, characterized in that The wall portion is located at one end of the shell in the second direction, 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, and the first direction, the second direction and the third direction are perpendicular to each other.

6. The battery according to claim 2, characterized in that The housing comprises: A shell body, wherein a receiving cavity with an opening is formed inside, and the receiving cavity is used to receive the electrode assembly; an end cap for closing the opening; Wherein, the end cover is the wall portion.

7. The battery according to claim 2, characterized in that The housing comprises: A shell, comprising an integrally formed side wall and the wall portion, wherein the side wall is disposed around the wall portion, and along the thickness direction of the wall portion, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, and the side wall and the wall portion jointly define a housing cavity for housing the electrode assembly; An end cap closes the opening.

8. The battery according to claim 1, characterized in that The fastener extends along the first direction.

9. The battery according to claim 1, characterized in that The fastener is bonded to the housing.

10. The battery according to claim 1, characterized in that The fastener is made of insulating material.

11. The battery according to claim 1, characterized in that Along the first direction, the housing has two opposite first outer surfaces, the first outer surfaces are the surfaces with the largest area among the outer surfaces of the housing, and the first direction is perpendicular to the first outer surfaces.

12. The battery according to claim 1, characterized in that 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; A first induced deformation portion is formed on the first main body portion, and the first induced deformation portion is configured to reduce a force required for the first main body portion to deform along the first direction.

13. The battery according to any one of claims 1 to 12, characterized in that The battery comprises a plurality of battery cell groups arranged along a third direction, wherein the third direction is perpendicular to the first direction; Wherein, the battery further includes a second busbar component, and the second busbar component electrically connects two adjacent battery cell groups.

14. The battery according to claim 13, characterized in that Along the third direction, one fastener is disposed between each two adjacent battery cell groups, and the fastener is connected to the outer shells of the battery cells of the two adjacent battery cell groups.

15. The battery according to claim 13, characterized in that 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 respectively electrically connected to two adjacent battery cell groups; A second induced deformation portion is formed on the second main body portion, and the second induced deformation portion is configured to reduce a force required for the second main body portion to deform along the third direction.

16. The battery according to claim 1, characterized in that The battery further comprises a box body, wherein an assembly space for accommodating the battery cell group is formed inside the box body; 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, characterized in that: The invention comprises a battery as claimed in any one of claims 1 to 16, wherein the battery is used to provide electrical energy.

Images