Battery and electrical device

Abstract

A battery (100) and an electrical device, relating to the technical field of batteries. The battery (100) comprises a fixing member (10) and battery cells (20). The fixing member (10) has a first surface (11). Each battery cell (20) comprises a housing (21) and an electrode assembly (22). The electrode assembly (22) is accommodated in the housing (21). The housing (21) has a wall portion (211). The wall portion (211) has a second surface (2111) facing away from the electrode assembly (22), and along a thickness direction (X) of the wall portion (211), the second surface (2111) and the first surface (11) are arranged to face each other. One of the first surface (11) and the second surface (2111) is provided with an engagement slot (2111a), and the other is provided with an engagement portion (111). The engagement portion (111) is inserted into and fitted with the engagement slot (2111a). The battery (100) can fasten the battery cells (20) onto the fixing member (10) to achieve fastening and positioning of the battery cells (20), thereby improving the structural stability and reliability of the battery cells (20) when assembled in the battery (100) and reducing phenomena such as shaking or displacement of the battery cells (20) during use. Accordingly, the risk of the battery cells (20) shifting or colliding with other components can be effectively reduced, improving the usage stability and service life of the battery (100).

Description

Batteries and electrical devices

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent application 2024211727729 entitled "Battery and Electrical Device", filed on May 27, 2024, the entire contents of which are incorporated herein by reference. Technical Field

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

[0004] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. A battery consists of a casing and individual battery cells housed within it. As a core component of new energy vehicles, the battery faces high requirements in terms of both operational stability and lifespan.

[0005] In battery technology, a battery typically consists of a casing and individual battery cells housed within the casing. The casing provides space for the battery cells to be assembled. However, existing batteries are prone to displacement or collisions of the battery cells within the casing during use, which can easily damage the battery cells, resulting in poor battery stability and a short lifespan.

[0006] Summary of the Invention

[0007] This application provides a battery and an electrical device that can effectively improve the battery's stability and lifespan.

[0008] In a first aspect, embodiments of this application provide a battery, including a fixing member and a battery cell; the fixing member has a first surface; the battery cell includes a housing and an electrode assembly, the electrode assembly is housed within the housing, the housing has a wall portion, the wall portion has a second surface facing away from the electrode assembly, and the second surface is disposed facing the first surface along the thickness direction of the wall portion; wherein, one of the first surface and the second surface is provided with a slot, and the other is provided with a snap-fit ​​portion, the snap-fit ​​portion being inserted into the slot.

[0009] In the above technical solution, the fixing component of the battery cell has a first surface, and the wall of the battery cell's outer shell has a second surface. The first surface and the second surface face each other. By providing a slot on one of the first surface and a snap-fit ​​part on the other, the snap-fit ​​part and the slot can fasten the battery cell to the fixing component, thereby achieving fastening and limiting of the battery cell. This improves the structural stability and reliability of the battery cell assembled into the battery, reduces the phenomenon of shaking or shifting of the battery cell during use, and effectively reduces the risk of the battery cell shifting or colliding with other components, thus improving the battery's stability and service life.

[0010] In some embodiments, the first surface abuts against the second surface.

[0011] In the above technical solution, by abutting the second surface of the wall portion against the first surface of the fastener, the wall portion becomes a structure that abuts against the fastener. This further improves the assembly stability between the battery cell and the fastener, and enhances the interlocking effect between the snap-fit ​​portion and the slot. Furthermore, by setting the second surface of the wall portion and the first surface of the fastener to abut against each other, the gap between the battery cell and the fastener can be reduced, thereby saving the space shared by the battery cell and the fastener in the thickness direction of the wall portion, which is beneficial for improving the utilization rate of the battery's internal space.

[0012] In some embodiments, one of the first surface and the second surface is provided with a plurality of slots, and the other surface is provided with a plurality of snap-fit ​​parts, each snap-fit ​​part being inserted into and engaged with a slot.

[0013] In the above technical solution, multiple slots are provided on one of the first surface of the fastener and the second surface of the wall, and multiple snap-fit ​​parts are provided on the other. Each snap-fit ​​part can be inserted and engaged with a slot, so that the battery cell has a structure in which multiple snap-fit ​​parts and multiple slots cooperate with each other to be fastened to the fastener. This helps to further improve the effect of fastening and limiting the battery cell, thereby further reducing the phenomenon of shaking or shifting of the battery cell during use. This further reduces the risk of the battery cell shifting or colliding with other components, thereby improving the stability and service life of the battery.

[0014] In some embodiments, the battery cell further includes a pressure relief mechanism disposed on the wall portion and configured to release the internal pressure of the battery cell; wherein, an exhaust chamber is formed inside the fixing member, a pressure relief port is disposed on the first surface, the pressure relief port communicates with the exhaust chamber, and the pressure relief mechanism is disposed opposite to the pressure relief port along the thickness direction of the wall portion.

[0015] In the above technical solution, the inside of the fixing component is also provided with an exhaust chamber, and the first surface of the fixing component is provided with a pressure relief port that communicates with the exhaust chamber. By setting the pressure relief mechanism of the battery cell to be arranged opposite to the pressure relief port in the thickness direction of the wall, the gas released by the pressure relief mechanism when the battery cell experiences thermal runaway can directly enter the exhaust chamber through the pressure relief port and be discharged through the exhaust chamber. The battery with this structure does not require a separate exhaust component for the pressure relief mechanism set on the wall, which helps to reduce the assembly difficulty of the battery and reduce the manufacturing cost of the battery. On the other hand, it can improve the exhaust smoothness of the pressure relief mechanism set on the wall, which helps to alleviate the phenomenon of the pressure relief mechanism being blocked or obstructed by the fixing component, thereby increasing the pressure relief rate of the battery cell. This can reduce the risk of explosion or bursting of the battery cell due to untimely pressure relief, thereby improving the reliability of the battery. Furthermore, in the structure in which the battery cell and the fixing component are assembled by interlocking parts and slots, the phenomenon of battery cell movement during pressure relief by the pressure relief mechanism can be mitigated, thereby reducing the risk of misalignment between the pressure relief mechanism and the pressure relief port due to battery cell movement. This can improve the stability and reliability of pressure relief of battery cells during thermal runaway.

[0016] In some embodiments, the projection of the pressure relief mechanism is located within the pressure relief port along the thickness direction of the wall.

[0017] In the above technical solution, by setting the projection of the pressure relief mechanism in the thickness direction of the wall to be located inside the pressure relief port, the pressure relief port can receive gas released from any position of the pressure relief mechanism, thereby further improving the exhaust smoothness of the pressure relief mechanism installed on the wall, and further improving the pressure relief rate of the battery cell.

[0018] In some embodiments, the interior of the fastener is formed with a flow channel for containing a heat exchange medium configured to exchange heat with the battery cells.

[0019] In the above technical solution, by providing a flow channel inside the fixing component, the flow channel of the fixing component can accommodate the heat exchange medium for heat exchange with the battery cell, so that the fixing component can also play a role in managing the temperature of the battery cell. The battery with this structure can, on the one hand, integrate the thermal management component for managing the temperature of the battery cell onto the fixing component, which helps to reduce the assembly difficulty of the battery and reduce the manufacturing cost of the battery. On the other hand, in the structure in which the battery cell and the fixing component are assembled by snapping together through the snap-fit ​​part and the snap-fit ​​groove, the contact area between the battery cell and the fixing component can be increased, thereby increasing the heat exchange area between the battery cell and the fixing component and improving the effect of the fixing component in managing the temperature of the battery cell.

[0020] In some embodiments, the fastener has a first surface on both sides along the thickness direction of the wall, and a battery cell is provided on both sides of the fastener, with the second surface of the battery cell on both sides of the fastener facing each other.

[0021] In the above technical solution, the fastener has a first surface on both sides of the wall thickness direction, so that battery cells can be set on both sides of the fastener. The battery cells on both sides of the fastener can be fixed and limited by one fastener, so that the battery cells on both sides of the fastener can share one fastener. On the one hand, it can save the battery manufacturing cost and reduce the assembly difficulty of the battery. On the other hand, it can optimize the internal space of the battery and improve the utilization rate of the internal space of the battery.

[0022] In some embodiments, a first surface is provided with a snap-fit ​​portion, and a second surface is provided with a snap-fit ​​groove.

[0023] In the above technical solution, by setting the snap-fit ​​part on the first surface of the fixing member and correspondingly setting the slot on the second surface of the wall, the structure is simple and easy to manufacture, which helps to reduce the assembly difficulty of the battery.

[0024] In some embodiments, along the thickness direction of the wall portion, the wall portion has a third surface facing the electrode assembly, and a protrusion is formed on the third surface corresponding to the position of the slot.

[0025] In the above technical solution, by forming a protrusion on the third surface of the wall facing the electrode assembly and at the position corresponding to the slot, the slot on the second surface of the wall can be a structure that can be formed by stamping, so that slots and protrusions are formed on both sides of the wall respectively. This helps to reduce the difficulty of setting slots on the second surface of the wall, thereby reducing the manufacturing difficulty of the battery cell and improving the production efficiency of the battery cell.

[0026] In some embodiments, the protrusion abuts against the electrode assembly along the thickness direction of the wall to form an exhaust channel between the electrode assembly and the third surface.

[0027] In the above technical solution, by setting the protrusion to allow the electrode assembly to abut against it in the thickness direction of the wall, the supporting effect of the protrusion can form an exhaust channel between the electrode assembly and the third surface. This can improve the internal exhaust smoothness of the battery cell when thermal runaway occurs, thereby increasing the depressurization rate of the battery cell and effectively reducing the risk of explosion or bursting caused by untimely depressurization of the battery cell, thus improving the reliability of the battery.

[0028] In some embodiments, the battery includes a plurality of battery cells stacked along a first direction, the first direction being perpendicular to the thickness direction of the wall portion; wherein, along the thickness direction of the wall portion, each of the plurality of battery cells has a second surface, and the second surfaces of the plurality of battery cells are all facing the first surface, and the slots and latching portions correspond one-to-one.

[0029] In the above technical solution, the battery is provided with multiple battery cells stacked along a first direction. The second surface of each battery cell faces the first surface of the fixing member, and the slots and locking parts are arranged in a one-to-one correspondence. This allows multiple battery cells stacked along the first direction to share a single fixing member, and all battery cells are fastened to a single fixing member. This battery structure can save on battery manufacturing costs and reduce battery assembly difficulty, and can optimize the internal space of the battery. On the other hand, when the battery cells expand along the first direction during use, it can reduce the change in the distance between two adjacent battery cells in the first direction. The fixing member absorbs and distributes the torque or tension of the busbar connecting two adjacent battery cells, thereby reducing the pulling phenomenon between the battery cells and the busbar. This helps to reduce the risk of electrical connection failure between battery cells, thereby improving the stability and service life of the battery.

[0030] In some embodiments, along the first direction, the housing has two opposing fourth surfaces, the fourth surface being the surface with the largest area among the outer surfaces of the housing, and the fourth surface being perpendicular to the first direction.

[0031] In the above technical solution, by setting the fourth surface with the largest area on the outer surface of the shell as a structure perpendicular to the first direction, the multiple battery cells are stacked along the thickness direction of the battery cells. Thus, the fasteners can also constrain and limit the battery cells in the direction of greater expansion, thereby alleviating the pulling phenomenon between the battery cells and the busbar in the direction of the greatest expansion of the battery cells, which helps to further reduce the risk of electrical connection failure between the battery cells.

[0032] In some embodiments, the battery further includes a housing, the interior of which is formed an assembly space, in which battery cells and fasteners are accommodated, and the fasteners are connected to the housing; wherein, the housing includes a first housing body and a second housing body arranged along a first direction, the first housing body and the second housing body overlapping each other and jointly defining the assembly space.

[0033] In the above technical solution, by housing both the battery cells and the fixing components within the housing, and connecting the fixing components to the housing, the battery cells can be securely fastened to the housing through the fixing components, thereby improving the stability and reliability of the battery cells assembled into the housing. Furthermore, by arranging the opposing first and second housing bodies along a first direction and overlapping each other, the arrangement direction of the first and second housing bodies is the same as the stacking direction of the multiple battery cells. This allows the multiple battery cells stacked along the first direction to be arranged horizontally within the housing, facilitating assembly and reducing the difficulty of assembling the battery cells into the housing. Additionally, the fixing components can constrain and limit the multiple battery cells in the direction of greatest expansion, alleviating the pulling phenomenon between the battery cells and the busbar components in the direction of greatest battery cell expansion.

[0034] In some embodiments, the battery includes multiple sets of battery cells arranged along a second direction, each set of battery cells including multiple battery cells stacked along a first direction, and the thickness direction of the wall, the first direction and the second direction are perpendicular to each other.

[0035] In the above technical solution, the battery is provided with multiple battery cells arranged along the second direction, and each group of battery cells includes multiple battery cells stacked along the first direction. This not only increases the battery capacity but also allows multiple groups of battery cells arranged along the second direction to share a single fixing component, and multiple battery cells in multiple groups are all fastened to a single fixing component. The battery with this structure can save on battery manufacturing costs and reduce battery assembly difficulty, and optimize the internal space of the battery. On the other hand, when the battery cells expand along the second direction during use, it can also reduce the change in the spacing between two adjacent battery cells in the second direction. The fixing component absorbs and distributes the torque or tension of the busbar connecting the two adjacent groups of battery cells, thereby reducing the pulling phenomenon between the battery cells and the busbar, which helps to reduce the risk of electrical connection failure between battery cells, thus improving the stability and service life of the battery.

[0036] In some embodiments, the housing includes a housing and an end cap; the housing includes an integrally formed first wall and a second wall, the first wall surrounding the second wall, one end of the first wall being connected to the second wall along the thickness direction of the wall portion, and the other end forming an opening, the first wall and the second wall together defining a receiving cavity for accommodating an electrode assembly; the end cap closes the opening; wherein, the second wall is a wall portion.

[0037] In the above technical solution, by setting the wall of the outer casing as a second wall of the casing that is opposite to the end cover in the thickness direction of the wall, the battery cell with this structure can make the wall with the slot or snap-fit ​​part far away from the end cover, so that there is no direct connection between the wall and the end cover. This can alleviate the phenomenon that the stress generated when the casing and the end cover are assembled and connected to each other is applied to the area where the slot or snap-fit ​​part is set on the wall, thereby reducing the risk of structural strength reduction in the area where the slot or snap-fit ​​part is set on the wall. In this way, the assembly reliability between the battery cell and the fixing parts can be improved, thereby improving the reliability and service life of the battery.

[0038] In some embodiments, the housing includes a housing and an end cap; the interior of the housing forms a receiving cavity with an opening for receiving an electrode assembly; the end cap closes the opening; wherein the end cap is a wall portion.

[0039] In the above technical solution, by setting the wall of the outer casing as an end cap for closing the opening of the casing, the battery cell with this structure is easy to process into a slot or snap-fit ​​part on the wall, which helps to reduce the difficulty of setting the slot or snap-fit ​​part on the wall, thereby reducing the assembly difficulty of the battery cell and improving the production efficiency of the battery cell.

[0040] Secondly, embodiments of this application also provide an electrical device, including the battery described above, which is used to provide electrical energy. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0043] Figure 2 is an exploded view of the battery structure provided in some embodiments of this application;

[0044] Figure 3 is an assembly diagram of the battery cell and the fastener provided in some embodiments of this application;

[0045] Figure 4 is a schematic diagram of the structure of the battery fixing component provided in some embodiments of this application;

[0046] Figure 5 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0047] Figure 6 is a front view of the housing of the outer casing provided in some embodiments of this application, facing the second surface in the thickness direction of the wall portion;

[0048] Figure 7 is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0049] Figure 8 is a cross-sectional view of a battery holder provided in some embodiments of this application;

[0050] Figure 9 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0051] Figure 10 is a front view of the housing of the outer casing provided in some embodiments of this application, facing the third surface in the thickness direction of the wall portion;

[0052] Figure 11 is a partial cross-sectional view of the housing of an outer casing provided in some embodiments of this application.

[0053] Icons: 1000 - Vehicle; 100 - Battery; 10 - Fixing component; 11 - First surface; 111 - Snap-fit ​​part; 112 - Pressure relief port; 12 - Exhaust chamber; 13 - Flow channel; 20 - Battery cell; 21 - Housing; 211 - Wall; 2111 - Second surface; 2111a - Slot; 2112 - Third surface; 2112a - Protrusion; 212 - Housing; 2121 - Receiving cavity; 2122 - Opening; 213 - End cap; 214 - Fourth surface; 22 - Electrode assembly; 221 - Tab; 23 - Electrode terminal; 24 - Current collector; 25 - Pressure relief mechanism; 26 - Exhaust channel; 30 - Housing; 31 - First housing body; 32 - Second housing body; 200 - Controller; 300 - Motor; X - Thickness direction of the wall; Y - First direction; Z - Second direction. Detailed Implementation

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

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

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

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

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

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

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

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

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

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

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

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

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

[0067] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide 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, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0104] In battery technology, a battery typically consists of a casing and individual battery cells housed within it. To increase battery capacity and power, multiple battery cells are usually stacked within the casing. In related technologies, to improve the stability of the battery cells within the casing, tape or adhesive layers are typically used to bond the battery cells to the inner surface of the casing. However, due to the complex operating environment and conditions of batteries, this type of battery structure can still experience battery cells moving or shifting within the casing during use. This can lead to risks such as displacement or collisions with other components, resulting in easily damaged battery cells or reduced reliability, which in turn hinders the improvement of battery stability and lifespan.

[0105] Based on the above considerations, in order to solve the problems of low battery stability and short service life, this application provides a battery including a fixing member and a battery cell. The fixing member has a first surface. The battery cell includes a housing and an electrode assembly, the electrode assembly being housed within the housing. The housing has a wall portion, and the wall portion has a second surface facing away from the electrode assembly. Along the thickness direction of the wall portion, the second surface faces the first surface. One of the first surface and the second surface is provided with a slot, and the other is provided with a locking portion, the locking portion engaging with the slot.

[0106] In this battery structure, the battery cell's fixing component has a first surface, and the wall of the battery cell's outer casing has a second surface. The first and second surfaces face each other. By providing a slot on one of the first and second surfaces and a snap-fit ​​part on the other, the snap-fit ​​part and the slot can fasten the battery cell to the fixing component, thereby achieving fastening and limiting of the battery cell. This improves the structural stability and reliability of the battery cell assembled into the battery, reducing the phenomenon of shaking or shifting of the battery cell during use. It also effectively reduces the risk of the battery cell shifting or colliding with other components, thus improving the battery's stability and service life.

[0107] The batteries disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system comprising such an electrical device can be constructed using batteries disclosed in this application. This helps to mitigate problems such as damage to individual battery cells or decreased reliability during use, thereby improving the stability and lifespan of the battery.

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

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

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

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

[0112] According to some embodiments of this application, referring to Figures 2, 3, 4, 5, and 6, Figure 2 is an exploded view of the structure of a battery 100 provided in some embodiments of this application; Figure 3 is an assembly diagram of a battery cell 20 and a fixing member 10 provided in some embodiments of this application; Figure 4 is a structural diagram of the fixing member 10 of a housing 30 provided in some embodiments of this application; Figure 5 is a structural diagram of a battery cell 20 provided in some embodiments of this application; and Figure 6 is a front view of a battery cell 20 provided in some embodiments of this application facing the second surface 2111 in the thickness direction X of the wall portion. This application provides a battery 100, which includes a fixing member 10 and a battery cell 20. The fixing member 10 has a first surface 11. The battery cell 20 includes a housing 21 and an electrode assembly 22, the electrode assembly 22 being housed within the housing 21. The housing 21 has a wall portion 211, the wall portion 211 having a second surface 2111 facing away from the electrode assembly 22. Along the thickness direction X of the wall portion, the second surface 2111 faces the first surface 11. One of the first surface 11 and the second surface 2111 is provided with a slot 2111a, and the other is provided with a snap-fit ​​part 111, which is inserted into the slot 2111a.

[0113] The battery 100 may further include a housing 30, which provides assembly space for the battery cell 20. The battery cell 20 and the fastener 10 are both housed within the housing 30, and the fastener 10 is interconnected with the housing 30. The housing 30 can adopt various structures. In some embodiments, the housing 30 may include a first housing body 31 and a second housing body 32, which overlap each other along a first direction Y, jointly defining an assembly space for accommodating the battery cell 20. The second housing body 32 may be a hollow structure open at one end, and the first housing body 31 may be a plate-like structure, covering the open side of the second housing body 32 so that the first housing body 31 and the second housing body 32 jointly define the assembly space. Alternatively, both the first housing body 31 and the second housing body 32 may be hollow structures open on one side, with the open side of the first housing body 31 covering the open side of the second housing body 32.

[0114] Of course, the box 30 formed by the first box body 31 and the second box body 32 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in Figure 2, the shape of the box 30 is a cuboid.

[0115] Optionally, in the battery 100, there can be one or more battery cells 20 housed within the casing 30. When there are multiple battery cells 20 housed within the casing 30, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that some of the battery cells 20 are connected in series and others in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the casing 30.

[0116] For example, in Figures 2 and 3, the fastener 10 has multiple sets of battery cells 20 arranged along the second direction Z on both sides of the wall thickness direction X. Each set of battery cells 20 includes multiple battery cells 20 stacked along the first direction Y. Referring to Figure 3, each set of battery cells 20 includes two battery cells 20 stacked along the first direction Y. Of course, in other embodiments, each set of battery cells 20 may also include three, four, five or six battery cells 20 stacked along the first direction Y.

[0117] Optionally, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in Figures 3 and 5, the battery cell 20 has a cuboid structure. For example, the thickness direction X of the wall is the height direction of the battery cell 20, the first direction Y is the thickness direction of the battery cell 20, and the second direction Z is the length direction of the battery cell 20.

[0118] In some embodiments, the battery 100 may also include other structures. For example, the battery 100 may also include a busbar for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0119] In this embodiment, the fastener 10 is fixed inside the housing 30 and serves to assemble and fix the battery cell 20. The fastener 10 is a structural beam inside the housing 30. For example, in Figures 2 and 3, the fastener 10 extends along the second direction Z, the fastener 10 is accommodated inside the housing 30 and the fastener 10 is connected to the housing 30.

[0120] The outer casing 21 of the battery cell 20 has a wall 211. The second surface 2111 of the wall 211 facing away from the electrode assembly 22 and the first surface 11 of the fastener 10 are disposed facing each other in the thickness direction X of the wall. That is, the fastener 10 is located on one side of the battery cell 20 in the thickness direction X of the wall, and the fastener 10 is disposed opposite to the wall 211, such that the surface of the fastener 10 facing the wall 211 is the first surface 11.

[0121] One of the first surface 11 and the second surface 2111 is provided with a slot 2111a, and the other is provided with a latching portion 111. That is, the first surface 11 of the fastener 10 may have a slot 2111a, and correspondingly, the second surface 2111 of the wall portion 211 may have a protruding latching portion 111. Alternatively, the first surface 11 of the fastener 10 may have a protruding latching portion 111, and correspondingly, the second surface 2111 of the wall portion 211 may have a slot 2111a. For example, in FIG4, the first surface 11 of the fastener 10 has a protruding latching portion 111, and correspondingly, as shown in FIG6, the second surface 2111 of the wall portion 211 has a slot 2111a.

[0122] The snap-fit ​​part 111 engages with the slot 2111a, that is, the snap-fit ​​part 111 is inserted into and snapped into the slot 2111a to fasten the battery cell 20 to the fixing member 10.

[0123] In the battery cell 20, the outer casing 21 can also be used to contain the electrolyte, such as electrolyte solution. The outer casing 21 can have various structural forms. The material of the outer casing 21 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0124] In some embodiments, referring to Figures 5 and 6, and further referring to Figure 7, Figure 7 is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. The housing 21 may include a housing 212 and an end cap 213. The housing 212 has a receiving cavity 2121 inside, and the receiving cavity 2121 has an opening 2122, that is, the housing 212 is a hollow structure with one end open. The end cap 213 covers the opening 2122 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0125] Optionally, the housing 212 includes an integrally formed first wall and a second wall, the first wall surrounding the second wall, one end of the first wall being connected to the second wall, and the other end forming an opening 2122, and an end cap 213 covering the opening 2122 and disposed opposite to the second wall.

[0126] It should be noted that the wall portion 211, which has a second surface 2111 and is disposed opposite to the fastener 10, can be an end cap 213 or one of the multiple walls of the housing 212. For example, in Figures 3 and 5, the wall portion 211 is the second wall of the housing 212 disposed opposite to the end cap 213 in the thickness direction X of the wall portion. That is, the thickness direction X of the wall portion is the arrangement direction of the end cap 213 and the second wall, and also the thickness direction of the end cap 213. Of course, in other embodiments, the wall portion 211 can also be the end cap 213 of the outer shell 21, or it can be the first wall of the housing 212 that is adjacent to and abuts against the end cap 213.

[0127] When assembling the battery cell 20, the electrode assembly 22 can be placed into the housing 212 first, and the electrolyte can be filled into the housing 212. Then, the end cap 213 can be placed on the opening 2122 of the housing 212 to close the opening 2122 of the housing 212.

[0128] The housing 212 can have various shapes, such as a cylinder or a cuboid. The shape of the housing 212 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, then the housing 212 can be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, then the housing 212 can be a cuboid structure. Of course, the end cap 213 can also have various structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 5, the housing 212 is a cuboid structure.

[0129] Understandably, the housing 21 is not limited to the structure described above. The housing 21 can also be other structures. For example, the housing 21 includes a shell 212 and two end caps 213. The shell 212 is a hollow structure with openings 2122 on opposite sides. One end cap 213 is fitted onto one opening 2122 of the shell 212 to form a sealed connection, thereby forming a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0130] Electrode assembly 22 is a component in battery cell 20 where electrochemical reactions occur. The structure of electrode assembly 22 can be various. For example, electrode assembly 22 can be a wound structure formed by winding positive electrode, separator and negative electrode, or a stacked structure formed by stacking positive electrode, separator and negative electrode.

[0131] For example, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0132] One end of the electrode assembly 22 has a tab 221, which is used to input or output the positive or negative electrode of the electrode assembly 22. It should be noted that the tab 221 of the electrode assembly 22 is a component formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer, or a component formed by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer. If the tab 221 is used to output the positive electrode of the electrode assembly 22, then the tab 221 is a component formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer; if the tab 221 is used to output the negative electrode of the electrode assembly 22, then the tab 221 is a component formed by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer.

[0133] Optionally, the electrode assembly 22 housed within the housing 21 can be one or more. For example, in FIG7, the housing 21 of the battery cell 20 is provided with two electrode assemblies 22, which are stacked along the first direction Y, that is, the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. Of course, in other embodiments, the electrode assembly 22 housed within the housing 21 can be one, three, four, five, six, seven, or eight, etc.

[0134] In some embodiments, as shown in Figures 5 and 7, the battery cell 20 may further include an electrode terminal 23, which is disposed on the housing 21 and connected to the tab 221 of the electrode assembly 22 to electrically connect the electrode terminal 23 and the electrode assembly 22. The electrode terminal 23 serves to output or input electrical energy of the battery cell 20. One end of the electrode terminal 23 is used to connect to the tab 221 of the electrode assembly 22, and the other end is used to connect to the current collector of the battery 100 to realize the input or output of electrical energy of the battery cell 20.

[0135] It should be noted that the electrode terminal 23 is insulated and mounted on the housing 21, meaning that there is no electrical connection between the electrode terminal 23 and the housing 21.

[0136] For example, the electrode terminal 23 is disposed on the end cap 213 of the housing 21. Of course, in other embodiments, the electrode terminal 23 may also be disposed on the housing 212 of the housing 21. Referring to Figures 3 and 5, in an embodiment where the wall portion 211 is a second wall opposite to the housing 212 and the end cap 213, the electrode terminal 23 is disposed at the end of the housing 21 away from the fixing member 10 in the thickness direction X of the wall portion.

[0137] In Figures 5 and 7, the battery cell 20 includes two electrode terminals 23, both of which are disposed on the end cap 213 and are spaced apart along the second direction Z. Correspondingly, each electrode assembly 22 has two tabs 221, which are spaced apart along the second direction Z and have opposite polarities. The two electrode terminals 23 are electrically connected to the two tabs 221 of the electrode assembly 22 to realize the input or output of electrical energy of the battery cell 20. For example, the electrode terminals 23 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0138] In some embodiments, as shown in FIG7, the battery cell 20 may further include two current collectors 24, both of which are disposed within the housing 21 and are spaced apart along the second direction Z. Each current collector 24 is used to connect an electrode terminal 23 and a tab 221 of the same polarity among multiple electrode assemblies 22 to realize the electrical connection between the electrode terminal 23 and the electrode assembly 22, which helps to reduce the assembly difficulty between the tab 221 and the electrode terminal 23.

[0139] For example, the material of the current collector 24 can be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0140] In some embodiments, as shown in FIG6, the battery cell 20 may further include a pressure relief mechanism 25 disposed on the housing 21. The pressure relief mechanism 25 is used to release the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0141] Optionally, the pressure relief mechanism 25 may be disposed on the end cap 213 of the housing 21 or on the housing 212 of the housing 21. For example, in FIG6, the pressure relief mechanism 25 is disposed on the wall portion 211.

[0142] Similarly, the pressure relief mechanism 25 and the outer shell 21 can be an integrally formed structure or a separate structure. If the pressure relief mechanism 25 and the outer shell 21 are separate structures, the pressure relief mechanism 25 can be connected to the outer shell 21 by welding or other means. Correspondingly, the pressure relief mechanism 25 can be a pressure relief component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve or safety valve. If the pressure relief mechanism 25 and the outer shell 21 are an integrally formed structure, the pressure relief mechanism 25 is an area on the outer shell 21 with a weak structure, such as an area on the outer shell 21 with a groove.

[0143] In this embodiment, the fixing member 10 of the battery cell 20 has a first surface 11, and the wall portion 211 of the outer shell 21 of the battery cell 20 has a second surface 2111. The first surface 11 and the second surface 2111 face each other. By providing a slot 2111a on one of the first surface 11 and the second surface 2111, and a snap-fit ​​part 111 on the other, the snap-fit ​​part 111 and the slot 2111a can fasten the battery cell 20 to the fixing member 10, thereby achieving fastening and limiting of the battery cell 20. This can improve the structural stability and reliability of the battery cell 20 assembled into the battery 100, reduce the phenomenon of shaking or shifting of the battery cell 20 during use, and effectively reduce the risk of displacement or collision with other components of the battery cell 20, thereby improving the stability and service life of the battery 100.

[0144] According to some embodiments of this application, as shown in Figures 3, 4 and 6, the first surface 11 abuts against the second surface 2111. That is, the wall portion 211 of the battery cell 20 abuts against the first surface 11 of the fixing member 10 in the thickness direction X of the wall portion.

[0145] In this embodiment, by abutting the second surface 2111 of the wall portion 211 against the first surface 11 of the fastener 10, the wall portion 211 is designed to abut against the fastener 10. This further improves the assembly stability between the battery cell 20 and the fastener 10, and enhances the interlocking effect between the snap-fit ​​portion 111 and the slot 2111a. Furthermore, by setting the second surface 2111 of the wall portion 211 against the first surface 11 of the fastener 10, the gap between the battery cell 20 and the fastener 10 can be reduced, thereby saving the space shared by the battery cell 20 and the fastener 10 in the thickness direction X of the wall portion, which is beneficial for improving the internal space utilization of the battery 100.

[0146] According to some embodiments of this application, as shown in Figures 4 and 6, one of the first surface 11 and the second surface 2111 is provided with a plurality of slots 2111a, and the other is provided with a plurality of latching parts 111, each latching part 111 being inserted into and engaged with a slot 2111a.

[0147] In this embodiment, one of the first surface 11 and the second surface 2111 is provided with a plurality of slots 2111a, and the other is provided with a plurality of snap-fit ​​parts 111. That is, the second surface 2111 of the wall portion 211 of the outer shell 21 of each battery cell 20 is provided with a plurality of slots 2111a, and the first surface 11 of the fastener 10 is provided with a plurality of snap-fit ​​parts 111 for each battery cell 20. Alternatively, the second surface 2111 of the wall portion 211 of the outer shell 21 of each battery cell 20 is provided with a plurality of snap-fit ​​parts 111, and the first surface 11 of the fastener 10 is provided with a plurality of slots 2111a for each battery cell 20.

[0148] Each card connector 111 is inserted into a card slot 2111a, that is, the card connector 111 and the card slot 2111a are set in a one-to-one correspondence.

[0149] For example, in FIG4, the area where the first surface 11 of the fastener 10 is opposite to the second surface 2111 of each battery cell 20 is provided with four snap-fit ​​portions 111. Correspondingly, in FIG6, the second surface 2111 of each battery cell 20 is provided with four slots 2111a, and each slot 2111a is for one snap-fit ​​portion 111 to be snapped into.

[0150] In this embodiment, a plurality of slots 2111a are provided on one of the first surface 11 of the fastener 10 and the second surface 2111 of the wall portion 211, and a plurality of engaging parts 111 are provided on the other. Each engaging part 111 can be inserted into a slot 2111a, so that the battery cell 20 has a structure in which multiple engaging parts 111 and multiple slots 2111a cooperate with each other to be fastened to the fastener 10. This helps to further improve the effect of fastening and limiting the battery cell 20, thereby further reducing the phenomenon of shaking or shifting of the battery cell 20 during use. This further reduces the risk of the battery cell 20 shifting or colliding with other components, thereby improving the stability and service life of the battery 100.

[0151] According to some embodiments of this application, referring to Figures 3, 4, and 6, and further referring to Figures 8 and 9, Figure 8 is a cross-sectional view of the fixing member 10 of the battery 100 provided in some embodiments of this application, and Figure 9 is a cross-sectional view of the battery cell 20 provided in some embodiments of this application. The battery cell 20 may further include a pressure relief mechanism 25, which is disposed on the wall portion 211 and configured to release the internal pressure of the battery cell 20. An exhaust chamber 12 is formed inside the fixing member 10, and a pressure relief port 112 is provided on the first surface 11, communicating with the exhaust chamber 12. Along the thickness direction X of the wall portion, the pressure relief mechanism 25 is disposed opposite to the pressure relief port 112.

[0152] The pressure relief mechanism 25 is configured to release the internal pressure of the battery cell 20, that is, the pressure relief mechanism 25 is used to release the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0153] In Figures 4 and 8, the fastener 10 is a structure that extends along the second direction Z, and the exhaust chamber 12 extends through both ends of the fastener 10 along the second direction Z, so as to discharge the gas in the exhaust chamber 12 out of the housing 30.

[0154] A pressure relief port 112 is provided on the first surface 11. The pressure relief port 112 is connected to the exhaust chamber 12. That is, the fixing member 10 is provided with a pressure relief port 112, and the two ends of the pressure relief port 112 in the thickness direction X of the wall penetrate the cavity wall of the first surface 11 and the cavity wall of the exhaust chamber 12 respectively, so that the pressure relief port 112 is formed on the first surface 11 and is connected to the exhaust chamber 12.

[0155] Along the thickness direction X of the wall portion, the pressure relief mechanism 25 is arranged opposite to the pressure relief port 112, that is, the pressure relief mechanism 25 is arranged facing the pressure relief port 112 in the thickness direction X of the wall portion. In other words, at least part of the projection of the pressure relief mechanism 25 in the thickness direction X of the wall portion is located inside the pressure relief port 112, so that the gas released by the pressure relief mechanism 25 can enter the exhaust chamber 12 through the pressure relief port 112.

[0156] In this embodiment, the fixing member 10 is further provided with an exhaust chamber 12, and the first surface 11 of the fixing member 10 is provided with a pressure relief port 112 that communicates with the exhaust chamber 12. By setting the pressure relief mechanism 25 of the battery cell 20 to be arranged opposite to the pressure relief port 112 in the thickness direction X of the wall, the gas released by the pressure relief mechanism 25 when the battery cell 20 experiences thermal runaway can directly enter the exhaust chamber 12 through the pressure relief port 112 and be further discharged through the exhaust chamber 12. The battery 100 with this structure... On the one hand, it eliminates the need for a separate venting component for the pressure relief mechanism 25 mounted on the wall portion 211, which helps reduce the assembly difficulty and manufacturing cost of the battery 100. On the other hand, it improves the venting smoothness of the pressure relief mechanism 25 mounted on the wall portion 211, which helps alleviate the phenomenon of the pressure relief mechanism 25 being blocked or obstructed by the fixing member 10, thereby increasing the pressure relief rate of the battery cell 20. This reduces the risk of explosion or bursting of the battery cell 20 due to untimely pressure relief, thus improving the reliability of the battery 100. In addition, the structure in which the battery cell 20 and the fixing member 10 are mutually engaged by the snap-fit ​​part 111 and the snap-fit ​​groove 2111a also helps to mitigate the phenomenon of the battery cell 20 moving around during pressure relief by the pressure relief mechanism 25, reducing the risk of misalignment between the pressure relief mechanism 25 and the pressure relief port 112 due to the movement of the battery cell 20. This improves the stability and reliability of the pressure relief of the battery cell 20 during thermal runaway.

[0157] In some embodiments, the projection of the pressure relief mechanism 25 is located within the pressure relief port 112 along the thickness direction X of the wall portion. That is, in a plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the wall surface of the pressure relief port 112 surrounds the outside of the orthographic projection of the pressure relief mechanism 25.

[0158] In this embodiment, by setting the projection of the pressure relief mechanism 25 in the thickness direction X of the wall portion to be located inside the pressure relief port 112, the pressure relief port 112 can receive gas released from any position of the pressure relief mechanism 25, thereby further improving the exhaust smoothness of the pressure relief mechanism 25 provided on the wall portion 211, so as to further improve the pressure relief rate of the battery cell 20.

[0159] According to some embodiments of this application, as shown in FIG8, a flow channel 13 may also be formed inside the fixing member 10. The flow channel 13 is used to accommodate a heat exchange medium, which is configured to exchange heat with the battery cell 20.

[0160] In one embodiment where an exhaust chamber 12 is formed inside the fixture 10, the flow channel 13 formed inside the fixture 10 is not connected to the exhaust chamber 12; that is, the flow channel 13 is formed inside the cavity wall of the exhaust chamber 12.

[0161] The flow channel 13 is used to contain the heat exchange medium, which is configured to exchange heat with the battery cell 20. That is, the heat exchange medium can exchange heat with the battery cell 20 through the fixing member 10 to manage the temperature of the battery cell 20.

[0162] For example, the heat exchange medium can be a gas, such as air or hydrogen, and the fluid medium can be a liquid, such as water, a salt solution, or liquid nitrogen.

[0163] In this embodiment, by providing a flow channel 13 inside the fixing member 10, the flow channel 13 of the fixing member 10 can accommodate the heat exchange medium for heat exchange with the battery cell 20, so that the fixing member 10 can also play the role of managing the temperature of the battery cell 20. The battery 100 with this structure can integrate the heat management component for managing the temperature of the battery cell 20 onto the fixing member 10, which helps to reduce the assembly difficulty of the battery 100 and the manufacturing cost of the battery 100. On the other hand, in the structure in which the battery cell 20 and the fixing member 10 are snapped together by the snap-fit ​​part 111 and the snap-fit ​​groove 2111a, the contact area between the battery cell 20 and the fixing member 10 can be increased, thereby increasing the heat exchange area between the battery cell 20 and the fixing member 10, so as to improve the effect of the fixing member 10 in managing the temperature of the battery cell 20.

[0164] According to some embodiments of this application, referring to Figures 3, 4, and 8, along the thickness direction X of the wall portion, both sides of the fixing member 10 have a first surface 11, and both sides of the fixing member 10 are provided with battery cells 20, with the second surfaces 2111 of the battery cells 20 on both sides of the fixing member 10 facing each other. That is, along the thickness direction X of the wall portion, both sides of the fixing member 10 are provided with battery cells 20, and the second surfaces 2111 of the battery cells 20 on both sides of the fixing member 10 face each other, such that the second surfaces 2111 of the battery cells 20 on both sides of the fixing member 10 face the two first surfaces 11 on both sides of the fixing member 10 respectively.

[0165] In this embodiment, the fixing member 10 has a first surface 11 on both sides of the wall thickness direction X, so that battery cells 20 can be provided on both sides of the fixing member 10. The battery cells 20 located on both sides of the fixing member 10 can be fixed and limited by one fixing member 10, so that the battery cells 20 located on both sides of the fixing member 10 can share one fixing member 10. On the one hand, it can save the manufacturing cost of the battery 100 and reduce the assembly difficulty of the battery 100. On the other hand, it can optimize the internal space of the battery 100 to improve the utilization rate of the internal space of the battery 100.

[0166] According to some embodiments of this application, as shown in Figures 4 and 6, a first surface 11 is provided with a snap-fit ​​portion 111, and a second surface 2111 is provided with a snap-fit ​​groove 2111a.

[0167] In this embodiment, by setting the snap-fit ​​portion 111 on the first surface 11 of the fixing member 10, and correspondingly setting the snap-fit ​​groove 2111a on the second surface 2111 of the wall portion 211, the structure is simple and easy to manufacture, which helps to reduce the assembly difficulty of the battery 100.

[0168] In some embodiments, referring to Figures 6 and 9, and further referring to Figures 10 and 11, Figure 10 is a front view of the housing 212 of the housing 21 provided in some embodiments of the present application, facing the third surface 2112 in the thickness direction X of the wall portion, and Figure 11 is a partial cross-sectional view of the housing 212 of the housing 21 provided in some embodiments of the present application. Along the thickness direction X of the wall portion, the wall portion 211 has a third surface 2112 facing the electrode assembly 22, and a protrusion 2112a is formed on the third surface 2112 corresponding to the position of the slot 2111a.

[0169] In this embodiment, the slots 2111a and protrusions 2112a are one-to-one corresponding structures in the thickness direction X of the wall. That is, a protrusion 2112a is formed on the third surface 2112 for each slot 2111a. It should be noted that in the embodiment where multiple slots 2111a are formed on the second surface 2111, multiple protrusions 2112a are also formed on the third surface 2112, and the protrusions 2112a are opposite to the slots 2111a and have the same number.

[0170] For example, the slot 2111a provided on the second surface 2111 of the wall portion 211 away from the electrode assembly 22 is formed by a stamping process, so that the slot 2111a is formed on the second surface 2111 on the side of the wall portion 211 away from the electrode assembly 22, and a protrusion 2112a is formed on the third surface 2112 on the side of the wall portion 211 facing the electrode assembly 22 at a position corresponding to the slot 2111a. Of course, the processing method of the slot 2111a provided on the second surface 2111 of the wall portion 211 away from the electrode assembly 22 is not limited to this. In other embodiments, the slot 2111a provided on the second surface 2111 of the wall portion 211 away from the electrode assembly 22 can also be formed by a processing process such as casting or milling.

[0171] In this embodiment, by forming a protrusion 2112a on the third surface 2112 of the wall portion 211 facing the electrode assembly 22 at a position corresponding to the slot 2111a, the slot 2111a on the second surface 2111 of the wall portion 211 is a structure that can be formed by stamping. This allows the slot 2111a and the protrusion 2112a to be formed on both sides of the wall portion 211, which helps to reduce the difficulty of setting the slot 2111a on the second surface 2111 of the wall portion 211, thereby reducing the manufacturing difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0172] In some embodiments, as shown in FIG9, a protrusion 2112a abuts against the electrode assembly 22 along the thickness direction X of the wall, so that an exhaust channel 26 is formed between the electrode assembly 22 and the third surface 2112.

[0173] The protrusion 2112a abuts against the electrode assembly 22, so that an exhaust channel 26 is formed between the electrode assembly 22 and the third surface 2112. In other words, the protrusion 2112a plays a supporting and separating role between the third surface 2112 and the electrode assembly 22, so that the electrode assembly 22 and the wall portion 211 can be arranged at intervals in the thickness direction X of the wall portion, so that an exhaust gap is formed between the electrode assembly 22 and the third surface 2112 of the wall portion 211. This exhaust gap is the exhaust channel 26 formed between the electrode assembly 22 and the third surface 2112 of the wall portion 211.

[0174] It should be noted that in embodiments where a pressure relief mechanism 25 is also provided on the wall portion 211, the exhaust channel 26 is configured to guide the gas inside the housing 21 to the pressure relief mechanism 25. That is, when the pressure relief mechanism 25 opens the valve and releases the internal pressure of the battery cell 20, the exhaust channel 26 can communicate with the outside of the housing 21 through the pressure relief mechanism 25, so that the gas inside the housing 21 can pass through the exhaust channel 26 and the pressure relief mechanism 25 in sequence and then be discharged to the outside of the housing 21.

[0175] In this embodiment, by setting the protrusion 2112a to be able to abut against the electrode assembly 22 in the thickness direction X of the wall, the supporting effect of the protrusion 2112a can form an exhaust channel 26 between the electrode assembly 22 and the third surface 2112. This can improve the internal exhaust smoothness of the battery cell 20 when thermal runaway occurs, thereby increasing the depressurization rate of the battery cell 20. This can effectively reduce the risk of explosion or bursting of the battery cell 20 due to untimely depressurization, thereby improving the reliability of the battery 100.

[0176] According to some embodiments of this application, referring to Figures 3, 4, and 6, the battery 100 includes a plurality of battery cells 20 stacked along a first direction Y, which is perpendicular to the thickness direction X of the wall portion. Along the thickness direction X of the wall portion, each of the plurality of battery cells 20 has a second surface 2111, and the second surface 2111 of each of the plurality of battery cells 20 faces the first surface 11. The slots 2111a and the latching portions 111 correspond one-to-one.

[0177] In this configuration, the second surfaces 2111 of the multiple battery cells 20 are all facing the first surface 11. That is, the second surfaces 2111 of the multiple battery cells 20 stacked along the first direction Y are all facing the first surface 11 of the fixing member 10, so that the pressure relief mechanism 25 of the multiple battery cells 20 stacked along the first direction Y is all facing the first surface 11 of the fixing member 10.

[0178] The slots 2111a and the latching parts 111 are in one-to-one correspondence. That is, the first surface 11 of the fastener 10 is provided with a latching part 111 in the area corresponding to each battery cell 20 stacked along the first direction Y. Correspondingly, the second surface 2111 of the wall portion 211 of the outer shell 21 of the battery cell 20 is provided with a slot 2111a, so that multiple battery cells 20 stacked along the first direction Y can be latched and fixed on one fastener 10. Alternatively, the first surface 11 of the fastener 10 is provided with a slot 2111a in the area corresponding to each battery cell 20 stacked along the first direction Y. Correspondingly, the second surface 2111 of the wall portion 211 of the outer shell 21 of the battery cell 20 is provided with a latching part 111, so that multiple battery cells 20 stacked along the first direction Y can be latched and fixed on one fastener 10.

[0179] For example, in FIG3, the battery 100 includes multiple sets of battery cells 20 arranged along the second direction Z. Each set of battery cells 20 includes multiple battery cells 20 stacked along the first direction Y. In the thickness direction X of the wall, multiple sets of battery cells 20 are provided on both sides of the fixing member 10. Correspondingly, one first surface 11 of the fixing member 10 faces the second surface 2111 of the multiple battery cells 20 located on one side of the fixing member 10, and the other first surface 11 of the fixing member 10 faces the second surface 2111 of the multiple battery cells 20 located on the other side of the fixing member 10.

[0180] For example, in FIG3, each group of battery cells 20 includes two battery cells 20 stacked along the first direction Y. Of course, in other embodiments, each group of battery cells 20 may also include three, four, five or six battery cells 20 stacked along the first direction Y.

[0181] In this embodiment, the battery 100 is provided with a plurality of battery cells 20 stacked along the first direction Y. The second surfaces 2111 of the plurality of battery cells 20 are all facing the first surface 11 of the fixing member 10, and the slots 2111a and the snap-fit ​​portions 111 are provided one-to-one, so that the plurality of battery cells 20 stacked along the first direction Y can share a fixing member 10, and the plurality of battery cells 20 can be fastened to a fixing member 10. The battery 100 with this structure can save the manufacturing cost of the battery 100 and reduce the assembly difficulty of the battery 100, and can optimize the internal space of the battery 100. On the other hand, when the battery cells 20 expand along the first direction Y during use, it can reduce the change in the distance between two adjacent battery cells 20 in the first direction Y, so that the torque or tension of the busbar connecting the two adjacent battery cells 20 can be absorbed and distributed by the fixing member 10, thereby reducing the pulling phenomenon between the battery cells 20 and the busbar, which helps to reduce the risk of electrical connection failure between the battery cells 20, thereby improving the stability and service life of the battery 100.

[0182] In some embodiments, as shown in Figures 3, 5 and 11, the outer casing 21 has two opposing fourth surfaces 214 along the first direction Y. The fourth surface 214 is the surface with the largest area among the outer surfaces of the outer casing 21, and the fourth surface 214 is perpendicular to the first direction Y.

[0183] The outer casing 21 has two opposing fourth surfaces 214, which are the surfaces with the largest area on the outer surface of the outer casing 21. In other words, the two fourth surfaces 214 are the outer surfaces of the outer casing 21 on both sides in the thickness direction of the battery cell 20.

[0184] The fourth surface 214 is perpendicular to the first direction Y. That is, among the multiple battery cells 20 stacked along the first direction Y, the fourth surface 214 between two adjacent battery cells 20 is arranged facing each other and abutting each other in the first direction Y.

[0185] In this embodiment, by setting the fourth surface 214 with the largest area on the outer surface of the housing 21 to be perpendicular to the first direction Y, the multiple battery cells 20 are stacked along the thickness direction of the battery cells 20. Thus, the fastener 10 can also constrain and limit the battery cells 20 in the direction of greater expansion, thereby alleviating the pulling phenomenon between the battery cells 20 and the busbar component in the direction of the greatest expansion of the battery cells 20, which helps to further reduce the risk of electrical connection failure between the battery cells 20.

[0186] According to some embodiments of this application, referring to FIG2, the battery 100 further includes a housing 30, the interior of which is formed an assembly space. The battery cell 20 and the fixing member 10 are both accommodated in the assembly space, and the fixing member 10 is connected to the housing 30. The housing 30 includes a first housing body 31 and a second housing body 32 arranged along a first direction Y. The first housing body 31 and the second housing body 32 cover each other and jointly define the assembly space.

[0187] It should be noted that in some embodiments, the battery 100 may not have a housing 30. The battery 100, including the fixing member 10 and the battery cells 20, can be directly assembled and installed onto the electrical device. Correspondingly, the fixing member 10 is fixed to the electrical device, thereby providing power to the electrical device. That is to say, the housing 30 can be part of the electrical device. Taking the vehicle 1000 as an example, the housing 30 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 30 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 30 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0188] In this embodiment, by housing both the battery cell 20 and the fixing member 10 within the housing 30, and connecting the fixing member 10 to the housing 30, the battery cell 20 can be securely fastened within the housing 30 via the fixing member 10, thereby improving the stability and reliability of the battery cell 20 assembled within the housing 30. Furthermore, by arranging the opposing first housing body 31 and second housing body 32 along the first direction Y and covering each other, the arrangement direction of the first housing body 31 and second housing body 32 is the same as the stacking direction of the multiple battery cells 20. This allows the multiple battery cells 20 stacked along the first direction Y to be arranged flat within the housing 30, facilitating assembly and reducing the difficulty of assembling the battery cells 20 within the housing 30. Additionally, the fixing member 10 can constrain and restrict the multiple battery cells 20 in the direction of greatest expansion, alleviating the pulling phenomenon between the battery cells 20 and the busbar component in the direction of greatest expansion of the battery cells 20.

[0189] In some embodiments, as shown in Figures 2, 3 and 4, the battery 100 may include multiple groups of battery cells 20 arranged along the second direction Z. Each group of battery cells 20 includes multiple battery cells 20 stacked along the first direction Y. The thickness direction X of the wall, the first direction Y and the second direction Z are perpendicular to each other.

[0190] The fixing member 10 is a plate-shaped structure extending along the second direction Z, and multiple sets of battery cells 20 arranged along the second direction Z are provided on both sides of the wall thickness direction X of the fixing member 10, so that the multiple sets of battery cells 20 located on both sides of the fixing member 10 share one fixing member 10.

[0191] In this embodiment, the battery 100 is provided with multiple battery cells 20 arranged along the second direction Z, and each group of battery cells 20 includes multiple battery cells 20 stacked along the first direction Y. This not only increases the capacity of the battery 100, but also allows multiple groups of battery cells 20 arranged along the second direction Z to share a single fixing member 10, and multiple battery cells 20 of multiple groups of battery cells 20 are all fastened to a single fixing member 10. The battery 100 with this structure can save manufacturing costs and reduce assembly difficulty, and optimize the internal space of the battery 100. On the other hand, when the battery cells 20 expand along the second direction Z during use, it can reduce the spacing change between two adjacent battery cells 20 in the second direction Z. The fixing member 10 absorbs and distributes the torque or tension of the busbar connecting the two adjacent groups of battery cells 20, thereby reducing the pulling phenomenon between the battery cells 20 and the busbar, which helps to reduce the risk of electrical connection failure between the battery cells 20, and improves the stability and service life of the battery 100.

[0192] According to some embodiments of this application, referring to Figures 5 and 7, the outer casing 21 may include a housing 212 and an end cap 213. The housing 212 includes an integrally formed first wall and a second wall. The first wall surrounds the second wall. Along the thickness direction X of the wall portion, one end of the first wall is connected to the second wall, and the other end forms an opening 2122. The first wall and the second wall together define a receiving cavity 2121 for accommodating the electrode assembly 22. The end cap 213 closes the opening 2122. The second wall is a wall portion 211.

[0193] The shell 212 includes an integrally formed first wall and a second wall, meaning that the shell 212 is manufactured using an integral forming process, such as stamping, casting, or extrusion molding. In other words, the first wall and the second wall of the shell 212 are an integral structure.

[0194] The second wall is wall portion 211, that is, wall portion 211 is a wall of housing 212 that is disposed opposite to end cap 213 in the thickness direction X of wall portion. Correspondingly, the surface of the second wall of housing 212 that is away from electrode assembly 22 is second surface 2111, and the second wall of housing 212 and the first surface 11 of fixing member 10 are disposed facing each other in the thickness direction X of wall portion.

[0195] In this embodiment, by setting the wall portion 211 of the outer casing 21 as the second wall of the casing 212 that is opposite to the end cap 213 in the thickness direction X of the wall portion, the battery cell 20 with this structure can make the wall portion 211 with the slot 2111a or the snap-fit ​​portion 111 far away from the end cap 213, so that there is no direct connection between the wall portion 211 and the end cap 213. This can alleviate the phenomenon that the stress generated when the casing 212 and the end cap 213 are assembled and connected to each other is applied to the area where the wall portion 211 has the slot 2111a or the snap-fit ​​portion 111, thereby reducing the risk of structural strength reduction in the area where the wall portion 211 has the slot 2111a or the snap-fit ​​portion 111, and thus improving the assembly reliability between the battery cell 20 and the fastener 10, thereby improving the reliability and service life of the battery 100.

[0196] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the outer casing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity 2121 with an opening 2122 for accommodating the electrode assembly 22. The end cap 213 closes the opening 2122 and is a wall portion 211. The surface of the end cap 213 of the outer casing 21 facing away from the electrode assembly 22 is a second surface 2111, and the end cap 213 and the first surface 11 of the fixing member 10 are arranged facing each other in the thickness direction X of the wall portion.

[0197] In this embodiment, by setting the wall portion 211 of the outer casing 21 as an end cap 213 for closing the opening 2122 of the casing 212, the battery cell 20 with this structure is easy to process into a slot 2111a or a snap-fit ​​portion 111 on the wall portion 211, which helps to reduce the difficulty of setting the slot 2111a or the snap-fit ​​portion 111 on the wall portion 211, thereby reducing the assembly difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0198] According to some embodiments of this application, this application also provides an electrical device, which includes a battery 100 of any of the above schemes, and the battery 100 is used to provide electrical energy to the electrical device.

[0199] The electrical device can be any of the aforementioned devices or systems that use battery 100.

[0200] According to some embodiments of this application, referring to Figures 2 to 11, this application provides a battery 100, which includes a housing 30, a fixing member 10, and battery cells 20. An assembly space is formed inside the housing 30, where the battery cells 20 and the fixing member 10 are both accommodated. The fixing member 10 is connected to the housing 30, and the housing 30 includes a first housing body 31 and a second housing body 32 arranged along a first direction Y. The first housing body 31 and the second housing body 32 overlap each other and jointly define the assembly space. The fixing member 10 extends along a second direction Z, and has two first surfaces 11 on each side of the fixing member 10 in the thickness direction X of the wall. Multiple sets of battery cells 20 arranged along the second direction Z are provided on both sides of the fixing member 10 along the thickness direction X of the wall. Each set of battery cells 20 includes multiple battery cells 20 stacked along the first direction Y. The thickness direction X of the wall, the first direction Y, and the second direction Z are perpendicular to each other. Along the first direction Y, the outer casing 21 has two opposing fourth surfaces 214, which are the surfaces with the largest area among the outer surfaces of the outer casing 21. A flow channel 13 is formed inside the fixing member 10, which is used to contain a heat exchange medium configured to exchange heat with the battery cell 20. The battery cell 20 includes the outer casing 21 and an electrode assembly 22. The outer casing 21 includes a housing 212 and an end cap 213. The housing 212 includes an integrally formed first wall and a second wall. The first wall surrounds the second wall. Along the thickness direction X of the wall portion, one end of the first wall is connected to the second wall, and the other end forms an opening 2122. The first wall and the second wall together define a receiving cavity 2121 for accommodating the electrode assembly 22. The end cap 213 closes the opening 2122. The second wall is a wall portion 211, which has a second surface 2111 facing away from the electrode assembly 22. Along the thickness direction X of the wall portion, the second surface 2111 faces and abuts against the first surface 11. Multiple slots 2111a are provided on the second surface 2111. The first surface 11 of the fixing member 10 has multiple engaging portions 111 corresponding to each battery cell 20, and each engaging portion 111 is inserted into a slot 2111a. Along the thickness direction X of the wall portion, the second surfaces 2111 of the battery cells 20 located on both sides of the fixing member 10 face each other, and each first surface 11 of the fixing member 10 abuts against the second surfaces 2111 of multiple sets of battery cells 20 located on the same side. A pressure relief mechanism 25 is also provided on the wall portion 211. The pressure relief mechanism 25 is configured to release the internal pressure of the battery cell 20. An exhaust chamber 12 is formed inside the fixing member 10. The exhaust chamber 12 is not connected to the flow channel 13, which is located within the wall of the exhaust chamber 12. A pressure relief port 112 is provided on the first surface 11. The pressure relief port 112 is connected to the exhaust chamber 12. Along the thickness direction X of the wall, the projection of the pressure relief mechanism 25 is located inside the pressure relief port 112.Along the thickness direction X of the wall portion, the third surface 2112 of the wall portion 211 faces the electrode assembly 22. A protrusion 2112a is formed on the third surface 2112 at the position corresponding to the slot 2111a. Along the thickness direction X of the wall portion, the protrusion 2112a abuts against the electrode assembly 22, so that an exhaust channel 26 is formed between the electrode assembly 22 and the third surface 2112. The exhaust channel 26 is configured to guide the gas inside the housing 21 to the pressure relief mechanism 25.

[0201] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0202] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery, comprising: The fastener has a first surface; as well as A battery cell includes a housing and an electrode assembly, the electrode assembly being housed within the housing, the housing having a wall portion having a second surface facing away from the electrode assembly, the second surface being disposed facing the first surface along the thickness direction of the wall portion; The first surface and the second surface are provided with a slot and a snap-fit ​​part, which are inserted into and engaged with the slot.

2. The battery of claim 1, wherein, The first surface abuts against the second surface.

3. The battery according to claim 1 or 2, wherein One of the first surface and the second surface is provided with a plurality of the card slots, and the other surface is provided with a plurality of the card contacts, each of the card contacts being inserted into and engaged with one of the card slots.

4. The battery of any one of claims 1-3, wherein, The battery cell also includes a pressure relief mechanism, which is disposed on the wall and configured to release the internal pressure of the battery cell. The fixing member has an exhaust chamber inside, and a pressure relief port is provided on the first surface. The pressure relief port is connected to the exhaust chamber. The pressure relief mechanism is arranged opposite to the pressure relief port along the thickness direction of the wall.

5. The battery of claim 4, wherein, Along the thickness direction of the wall portion, the projection of the pressure relief mechanism is located within the pressure relief port.

6. The battery of any one of claims 1-5, wherein, The fixture has a flow channel inside, which is used to contain a heat exchange medium configured to exchange heat with the battery cell.

7. The battery according to any one of claims 1-6, wherein, Along the thickness direction of the wall portion, both sides of the fixing member have the first surface, and both sides of the fixing member are provided with the battery cell, with the second surface of the battery cell located on both sides of the fixing member facing each other.

8. The battery according to any one of claims 1-7, wherein, The first surface has the latching portion protruding, and the second surface has the latching groove.

9. The battery according to claim 8, wherein, Along the thickness direction of the wall portion, the wall portion has a third surface facing the electrode assembly, and the third surface has a protrusion formed at the position corresponding to the slot.

10. The battery according to claim 9, wherein, Along the thickness direction of the wall portion, the protrusion abuts against the electrode assembly to form an exhaust channel between the electrode assembly and the third surface.

11. The battery according to any one of claims 1-10, wherein, The battery includes a plurality of battery cells stacked along a first direction, the first direction being perpendicular to the thickness direction of the wall portion; In this configuration, along the thickness direction of the wall portion, each of the multiple battery cells has a second surface, and the second surface of each of the multiple battery cells is disposed facing the first surface, with the slot and the latching portion corresponding one-to-one.

12. The battery according to claim 11, wherein, Along the first direction, the outer shell has two opposing fourth surfaces, which are the surfaces with the largest area among the outer surfaces of the outer shell, and the fourth surfaces are perpendicular to the first direction.

13. The battery according to claim 11 or 12, wherein, The battery also includes a housing, the interior of which forms an assembly space. The battery cells and the fasteners are both housed within the assembly space, and the fasteners are connected to the housing. 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.

14. The battery according to any one of claims 11-13, wherein, The battery includes multiple sets of battery cells arranged along the second direction, and each set of battery cells includes multiple battery cells stacked along the first direction. The thickness direction of the wall, the first direction, and the second direction are perpendicular to each other.

15. The battery according to any one of claims 1-14, wherein, The outer casing includes: The housing includes an integrally formed first wall and a second wall, the first wall surrounding the second wall. Along the thickness direction of the wall portion, one end of the first wall is connected to the second wall, and the other end is closed to form an opening. The first wall and the second wall together define a receiving cavity for accommodating the electrode assembly. End cap, to close the opening; The second wall is the wall portion.

16. The battery according to any one of claims 1-14, wherein, The outer casing includes: The housing has an internally formed receiving cavity with an opening for accommodating the electrode assembly; End cap, to close the opening; The end cap is the wall portion.

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

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