Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. Wherein the battery monomer comprises a shell, a first electrode terminal and a first deformation piece; the shell is provided with a first wall; the first electrode terminal is arranged on the first wall in an insulating manner; the first deformation piece is connected with the first wall, the first deformation piece is provided with a first contact surface, the first electrode terminal is provided with a second contact surface, and the first deformation piece is configured to be deformable to enable the first contact surface to be in contact with the second contact surface so as to electrically connect the first electrode terminal with the first wall; the first contact face is provided with a first end and a second end which are oppositely arranged in the first direction, the second end is closer to the middle of the first wall in the first direction relative to the first end, and the first direction is perpendicular to the thickness direction of the first wall. Wherein the distance between the first contact surface and the second contact surface in the thickness direction is gradually increased along the direction from the first end to the second end. According to the technical scheme provided by the invention, the reliability of the battery monomer can be improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing day by day.

[0003] In the development of battery technology, how to improve battery reliability is a technical problem that urgently needs to be solved. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device. The technical solution provided by this application can improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell including a housing, a first electrode terminal, and a first deformable member; the housing has a first wall; the first electrode terminal is insulated from the first wall; the first deformable member is connected to the first wall, the first deformable member has a first contact surface, the first electrode terminal has a second contact surface, the first deformable member is configured to deform to make the first contact surface contact the second contact surface to electrically connect the first electrode terminal to the first wall; the first contact surface has a first end and a second end disposed opposite to each other along a first direction, the second end being closer to the middle of the first wall along the first direction relative to the first end, the first direction being perpendicular to the thickness direction of the first wall; wherein, along the direction from the first end to the second end, the distance between the first contact surface and the second contact surface gradually increases in the thickness direction.

[0006] In the above technical solution, since the expansion degree of the middle part of the first wall along the first direction is greater than that of its edge, the distance between the first contact surface and the second contact surface in the thickness direction gradually increases from the first end to the second end. This ensures that when the battery cell expands due to long-term use or thermal runaway, the distance between the contact point on the first contact surface and the corresponding contact point on the second contact surface in the thickness direction of the first wall is within a certain range. Furthermore, when the internal pressure of the battery cell exceeds a first threshold due to thermal runaway, causing the first deformable component to deform, the internal pressure of the battery cell allows the first contact surface and the second contact surface to make surface contact, thereby increasing the contact area between the first and second contact surfaces and reducing the risk of melting at the contact point. This allows the first deformable component to effectively provide overcharge protection, thus effectively improving the reliability of the battery cell under abuse conditions such as overcharging, and ultimately resulting in high reliability of the battery cell.

[0007] In some embodiments, the first direction is the length direction of the first wall, and the dimension of the first wall in its length direction is greater than the dimension of the first wall in its width direction.

[0008] In the above technical solution, the first direction is the length direction of the first wall, and the dimension of the first wall in its length direction is greater than the dimension of the first wall in its width direction. Since the larger the dimension of the first wall in the first direction, the greater the expansion of the first wall at its center along the first direction compared to its edges, the arrangement of gradually increasing the distance between the first contact surface and the second contact surface in the thickness direction along the direction from the first end to the second end ensures that when the battery cell expands due to long-term use or thermal runaway, the distance between the contact point on the first contact surface and the corresponding contact point on the second contact surface in the thickness direction of the first wall remains within a certain range. This allows the first deformable component to effectively provide overcharge protection, thereby effectively improving the reliability of the battery cell under abuse conditions such as overcharging, and ultimately resulting in high reliability of the battery cell.

[0009] In some embodiments, at least one of the first contact surface and the second contact surface is inclined relative to the outer surface of the first wall.

[0010] In the above technical solution, at least one of the first contact surface and the second contact surface is inclined relative to the outer surface of the first wall, that is, at least one of the first contact surface and the second contact surface is set as a flat surface. On the one hand, it is convenient to process at least one of the first contact surface and the second contact surface. On the other hand, during the assembly of the battery cell, the first wall can be used as the assembly base for the first contact surface and the second contact surface, thereby facilitating the manufacturing of the battery cell.

[0011] In some embodiments, the first contact surface is inclined relative to the outer surface of the first wall, and the second contact surface is parallel to the outer surface of the first wall.

[0012] In the above technical solution, the first contact surface is inclined relative to the outer surface of the first wall, and the second contact surface is parallel to the outer surface of the first wall. That is, both the first contact surface and the second contact surface are planar, which facilitates the processing of the first contact surface and the second contact surface. Since the second contact surface is parallel to the outer surface of the first wall, the processing difficulty of the first electrode terminal is reduced when processing the first deformed part, thereby reducing the manufacturing cost of the battery cell.

[0013] In some embodiments, the second contact surface is inclined relative to the outer surface of the first wall, and the first contact surface is parallel to the outer surface of the first wall.

[0014] In the above technical solution, the second contact surface is inclined relative to the outer surface of the first wall, and the first contact surface is parallel to the outer surface of the first wall. That is, both the first contact surface and the second contact surface are planes, which facilitates the processing of the first contact surface and the second contact surface. Since the first contact surface is parallel to the outer surface of the first wall, the processing difficulty of the first deformed part is reduced when processing the first deformed part, thereby reducing the manufacturing cost of the battery cell.

[0015] In some embodiments, the plane containing the first contact surface and the plane containing the second contact surface form an angle.

[0016] In the above technical solution, the angle between the plane containing the first contact surface and the plane containing the second contact surface, i.e., both the first contact surface and the second contact surface are set as straight surfaces, facilitates the processing of the first contact surface and the second contact surface, thereby reducing the manufacturing cost of the battery cell.

[0017] In some embodiments, the included angle is α, which satisfies 10°≤α≤60°.

[0018] In the above technical solution, when α≥10°, after the first wall expands and deforms, causing the first deformable member to move, the distance between the contact point on the first contact surface and the corresponding contact point on the second contact surface along the first direction in the thickness direction is within a certain range. This allows the pressure inside the shell to better drive the first contact surface to contact the second contact surface when the first deformable member deforms due to excessive internal pressure caused by thermal runaway, thus improving the reliability of the battery cell. When α≤60°, with a fixed size of the first contact surface in the first direction, the size of the first contact surface in the thickness direction is smaller, thereby reducing the size of the first deformable member in the thickness direction. This allows more space inside the shell in the thickness direction to be used for the installation of other structural components such as electrode assemblies, thereby increasing the energy density of the battery cell. Therefore, when 10°≤α≤60°, the reliability of the battery cell can be improved while increasing the energy density of the battery cell.

[0019] In some embodiments, 20°≤α≤45°.

[0020] In the above technical solution, when α≥20°, after the first wall expands and deforms, causing the first deformable part to move, the distance between the contact point on the first contact surface and the corresponding contact point on the second contact surface along the first direction in the thickness direction is within a certain range. This allows the pressure inside the shell to better contact the first contact surface with the second contact surface when the first deformable part deforms due to excessive internal pressure caused by thermal runaway, thereby further improving the reliability of the battery cell. When α≤45°, with the size of the first contact surface in the first direction being constant, the first contact surface is further reduced in the thickness direction, thereby further reducing the size of the first deformable part in the thickness direction. This allows more space inside the shell in the thickness direction to be used for the installation of other structural components such as electrode assemblies, thereby increasing the energy density of the battery cell. Therefore, when 20°≤α≤45°, the reliability of the battery cell can be further improved while the energy density of the battery cell can be further increased.

[0021] In some embodiments, the first wall is provided with a first through hole, and at least a portion of the first deformable member is connected to the inner surface of the first wall and blocks the first through hole.

[0022] In the above technical solution, the first wall is provided with a first through hole, and at least a portion of the deformable member is connected to the inner surface of the first wall and blocks the first through hole, so that the first through hole does not affect the sealing performance of the outer shell. When the pressure inside the outer shell reaches a certain threshold, the first deformable member can be deformed by the pressure to pass through the first through hole, thereby facilitating the contact between the first contact surface and the second contact surface. The structure is simple and easy to implement.

[0023] In some embodiments, the first electrode terminal includes a first conductive element and a first terminal post; at least a portion of the first conductive element is located outside the first wall; the first terminal post is connected to the first conductive element, and the first wall is provided with a first terminal hole through which the first terminal post passes; the battery cell further includes a first insulating element; at least a portion of the first insulating element is disposed between the first wall and the conductive element; wherein, the second contact surface is disposed on the first conductive element.

[0024] In the above technical solution, the first electrode terminal is configured as a separate structure including the first conductive element and the first electrode post, which is more convenient to manufacture than the case where the first electrode terminal is integrated. At the same time, the second contact surface is disposed on the first conductive element, which reduces the manufacturing difficulty of the first electrode post compared to the case where the second contact surface is disposed on both the first conductive element and the first electrode post, thereby reducing the manufacturing cost of the battery cell.

[0025] In some embodiments, the battery cell further includes a second electrode terminal disposed on the first wall, and the first electrode terminal and the second electrode terminal have opposite polarities; along the first direction, the first electrode terminal and the second electrode terminal are spaced apart.

[0026] In the above technical solution, by setting the second electrode terminal on the first wall and making the first electrode terminal and the second electrode terminal spaced apart along the first direction, compared with the case where the second electrode terminal and the first electrode terminal are set on different walls of the casing, on the one hand, the first electrode terminal and the second electrode terminal occupy the space on the same side of the battery cell, making the battery cell occupy less space and thus improving the energy density of the battery device with the battery cell; on the other hand, the heat generated by the charging and discharging of the battery cell is concentrated on the first wall, reducing local overheating of other walls of the battery cell, facilitating the thermal management of the battery cell, and thus extending the service life of the battery cell.

[0027] In some embodiments, the second electrode terminal is insulated from the first wall; the battery cell further includes a second deformable member connected to the first wall, the second deformable member having a third contact surface, the second electrode terminal having a fourth contact surface, the second deformable member being configured to deform to make the third contact surface contact the fourth contact surface to electrically connect the second electrode terminal to the first wall; the third contact surface has a third end and a fourth end disposed opposite to each other along the first direction, the fourth end being closer to the middle of the first wall along the first direction relative to the third end; wherein, along the direction from the third end to the fourth end, the distance between the third contact surface and the fourth contact surface gradually increases in the thickness direction.

[0028] In the above technical solution, by setting a second deformable member, when the internal pressure of the battery cell reaches a certain level, the deformation of the second deformable member allows it to contact the second electrode terminal, thereby making the second electrode terminal electrically connected to the first wall. Combined with the contact between the first deformable member and the first electrode terminal, this causes the electrical connection components inside the battery cell to melt due to the large current generated by a short circuit, thus cutting off the charging and discharging circuit of the battery cell. This provides overcharge protection and reduces the risk of thermal runaway of the battery cell, resulting in higher battery reliability. Simultaneously, since the expansion degree of the middle part of the first wall along the first direction is greater than that of its edges, the arrangement of gradually increasing distance in the thickness direction between the third and fourth contact surfaces along the direction from the third end to the fourth end ensures that when the battery cell expands due to long-term use or thermal runaway, the distance between the contact points on the third contact surface and the corresponding contact points on the fourth contact surface remains within a certain range in the thickness direction of the first wall. Furthermore, when the internal pressure of a battery cell exceeds the second threshold due to thermal runaway, causing the second deformation component to deform, the internal pressure of the battery cell can make the third contact surface and the fourth contact surface make surface contact, thereby increasing the contact area between the third contact surface and the fourth contact surface and reducing the risk of melting of the part of the third contact surface or the fourth contact surface. This allows the second deformation component to effectively play the role of overcharge protection, thereby effectively improving the reliability of the battery cell under abuse conditions such as overcharging, and thus making the battery cell highly reliable.

[0029] In some embodiments, the housing includes a shell and a cover plate, the shell having an opening and the cover plate sealing the opening; the first wall is the cover plate, or the first wall is a wall portion of the shell opposite to the cover plate.

[0030] In the above technical solution, the opening design facilitates the placement of the electrode assembly inside the housing, and the cover plate seals the opening to form a sealed space, thereby providing a stable working environment for the electrode assembly and improving the reliability of the battery cell.

[0031] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0032] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell or battery device, wherein the battery cell is used to provide electrical energy. Attached Figure Description

[0033] 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.

[0034] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0035] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0036] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0037] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0038] Figure 5 Exploded views of the structure of the first wall provided for some embodiments of this application;

[0039] Figure 6 A cross-sectional view of a battery cell at the first electrode terminal provided for some embodiments of this application;

[0040] Figure 7 A cross-sectional view of another battery cell at the first electrode terminal provided in some embodiments of this application;

[0041] Figure 8 A cross-sectional view of a single battery cell during expansion, provided for some embodiments of this application;

[0042] Figure 9 This is a schematic diagram of the structure of the first deformable member provided in some embodiments of this application;

[0043] Figure 10 for Figure 6 A magnified view of a section at point A in the middle;

[0044] Figure 11 This is a schematic diagram of the structure of the first conductive element provided in some embodiments of this application;

[0045] Figure 12 A cross-sectional view of a battery cell at the second electrode terminal provided for some embodiments of this application;

[0046] Figure 13 A cross-sectional view of another battery cell at the second electrode terminal provided for some embodiments of this application.

[0047] Icons: 1000 - Vehicle; 100 - Battery Unit; 10 - Housing; 11 - First Housing Body; 12 - Second Housing Body; 20 - Battery Cell; 21 - Housing; 21A - Housing; 21B - Cover Plate; 211 - First Wall; 2111 - First Through Hole; 2111A - First Section; 2111B - Second Section; 2112 - First Terminal Hole; 2113 - Third Through Hole; 2114 - Second Terminal Hole; 2115 - Fifth End; 2116 - Sixth End; 22 - First Electrode Terminal; 22A - First Conductive Component; 220 - Second Contact Surface; 220A - First Body; 220B - First Protrusion; 220C - First Connecting Hole; 22B - First Terminal Post; 221 - Second Electrode Terminal; 2210 - Fourth Contact Surface; 221A - Second Conductive Component; 221B - Second Terminal Post; 23 - First Adapter; 231-Second adapter; 24-Electrode assembly; 241-Main body; 242-First tab; 243-Second tab; 25-First deformable part; 251-First skirt; 252-First flip foil; 253-First electrical connection part; 2531-First contact surface; 2531A-First end; 2531B-Second end; 26-Second deformable part; 261-Second skirt; 262-Second flip foil; 263-Second electrical connection part; 2631-Third contact surface; 2631A-Third end; 2631B-Fourth end; 27-First insulating part; 271-Second through hole; 272-Fifth through hole; 28-Second insulating part; 281-Fourth through hole; 282-Sixth through hole; 29-Third insulating part; 200-Controller; 300-Motor; X-First direction; Y-Thickness direction; Z-Width direction. Detailed Implementation

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] In this application, "multiple" means two or more (including two).

[0055] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0056] 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.

[0057] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0058] 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, reduces the risk of short circuits while allowing active ions to pass through.

[0059] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0060] 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.

[0061] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0062] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0063] 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.

[0064] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0065] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0070] In some implementations, the electrode assembly is a stacked structure.

[0071] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0072] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0073] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0074] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0075] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0076] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0077] 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.

[0078] 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.

[0079] 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 prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0080] 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.

[0081] In related technologies, a battery cell generally includes a casing and an electrode assembly. The casing may include a housing and an end cap. The housing has an opening. After the electrode assembly is installed inside the housing, the opening of the housing can be closed by the end cap to form a sealed space inside the housing to accommodate the electrode assembly.

[0082] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0083] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0084] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0085] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0086] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0087] 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.

[0088] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0089] The following discussion will primarily focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical battery cells, pouch cell cells, or blade cell cells.

[0090] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate and other performance parameters. In addition, the reliability of the battery device also needs to be considered.

[0091] For individual battery cells, the main safety hazards come from the charging and discharging processes. Overcharging can cause the electrolyte to decompose, producing gases (such as hydrogen and oxygen), increasing internal pressure, and causing the battery to expand. Simultaneously, overcharging increases the internal resistance of the battery cell, causing it to heat up. High temperatures accelerate side reactions, producing even more gas and leading to further expansion. Currently, some battery cells are equipped with overcharge protection structures. For example, this overcharge protection structure includes a deformable component electrically connected to the casing. Under abusive conditions such as overcharging, when the internal pressure of the battery cell increases to a certain extent, the deformable component deforms under the internal pressure and can contact the electrode terminals, for example, connecting with a conductive component. This short-circuits the casing and the electrode terminals, short-circuiting the positive and negative terminals of the battery cell, creating an internal short circuit. The electrical connection components inside the battery cell melt due to the large current generated by the short circuit, thereby cutting off the charging and discharging circuit of the battery cell and providing overcharge protection.

[0092] However, when a battery cell expands due to long-term use or thermal runaway, the periphery of the wall portion of the casing with the deformable member (hereinafter referred to as the first wall) is connected to other walls, thus limiting the expansion of the edge of the first wall. This results in the main expansion area of ​​the first wall being the middle portion of the first wall in its first direction. If the deformable member is not located in the middle region of the first wall, the expansion of the first wall will cause the end of the deformable member closer to the middle of the first wall to be closer to the electrode terminal corresponding to the deformable member along the thickness direction of the first wall, relative to the end of the deformable member farther from the middle of the first wall. Therefore, during thermal runaway, when the deformable component is deformed by the pressure inside the casing, the contact surface of the deformable component near the middle of the first wall will first come into contact with the electrode terminal. However, the pressure inside the casing may not be sufficient to cause the contact surface of the deformable component away from the middle of the first wall to also come into contact with the electrode terminal first. This results in point contact or line contact between the deformable component and the electrode terminal. When the deformable component comes into contact with the electrode terminal, causing a short circuit inside the battery cell, the large current will cause the part of the deformable component in contact with the electrode terminal to melt and form an open circuit. This will prevent the electrical connector from melting and thus prevent the charging and discharging circuit of the battery cell from being cut off, resulting in the failure of overcharge protection, affecting the reliability of the battery cell, and making the battery reliability low.

[0093] Based on the above considerations, to reduce the risk of overcharge protection failure due to the deformation of the first wall during expansion, which could lead to a smaller contact area between the first deformable member and the first electrode terminal, causing melting, an embodiment of this application provides a battery cell including a casing, a first electrode terminal, and a first deformable member. The casing has a first wall; the first electrode terminal is insulated from the first wall; the first deformable member is connected to the first wall, the first deformable member has a first contact surface, the first electrode terminal has a second contact surface, and the first deformable member is configured to deform to make the first contact surface contact the second contact surface to electrically connect the first electrode terminal to the first wall; the first contact surface has a first end and a second end disposed opposite to each other along a first direction, the second end being closer to the middle of the first wall along the first direction relative to the first end, the first direction being perpendicular to the thickness direction of the first wall; wherein, along the direction from the first end to the second end, the distance between the first contact surface and the second contact surface in the thickness direction gradually increases.

[0094] In this battery cell structure, because the expansion of the first wall along the first direction is greater at its center than at its edges, the distance between the first and second contact surfaces in the thickness direction gradually increases from the first end to the second end. This ensures that when the battery cell expands due to long-term use or thermal runaway, the distance between the contact points on the first and second contact surfaces in the thickness direction of the first wall remains within a certain range. Furthermore, when thermal runaway causes the internal pressure of the battery cell to exceed a first threshold, leading to deformation of the first deformation member, the internal pressure allows the first and second contact surfaces to make surface contact, increasing the contact area and reducing the risk of melting at the contact point. This allows the first deformation member to effectively provide overcharge protection, thereby significantly improving the reliability of the battery cell under overcharge and other abuse conditions, resulting in high overall battery cell reliability.

[0095] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0096] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure 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 device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 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 device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0097] In some embodiments of this application, the battery device 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.

[0098] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, which are housed within the housing 10.

[0099] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0100] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0101] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. 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 housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0102] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0103] 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... Figure 3 In the middle, the battery cell 20 has a cuboid structure.

[0104] Please refer to Figures 3-5 Please refer to Figures 6-8 , Figure 4 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. Figure 5 Exploded views of the structure of the first wall 211 provided in some embodiments of this application. Figure 6 and Figure 7 This is a cross-sectional view of two battery cells 20 at the first electrode terminal 22 provided in some embodiments of this application. Figure 8This is a cross-sectional view of a battery cell 20 when it expands, as provided in some embodiments of this application. Embodiments of this application provide a battery cell 20, including a housing 21, a first electrode terminal 22, and a first deformable member 25. The housing 21 has a first wall 211; a first electrode terminal 22 is insulated from the first wall 211; a first deformable member 25 is connected to the first wall 211, the first deformable member 25 has a first contact surface 2531, the first electrode terminal 22 has a second contact surface 220, the first deformable member 25 is configured to deform so that the first contact surface 2531 contacts the second contact surface 220 to electrically connect the first electrode terminal 22 to the first wall 211; the first contact surface 2531 has a first end 2531A and a second end 2531B disposed opposite to each other along a first direction X, the second end 2531B is closer to the middle of the first wall 211 along the first direction X relative to the first end 2531A, the first direction X is perpendicular to the thickness direction Y of the first wall 211; wherein, along the direction from the first end 2531A to the second end 2531B, the distance between the first contact surface 2531 and the second contact surface 220 in the thickness direction Y gradually increases.

[0105] The housing 21 is a component for accommodating some structural parts of the battery cell 20 (such as the electrode assembly 24). The housing 21 can also be used to accommodate electrolytes, such as electrolyte solution. In some embodiments, a receiving cavity is formed inside the housing 21 for accommodating the electrode assembly 24.

[0106] In some embodiments, the electrode assembly 24 includes a body 241 and electrode tabs, wherein the electrode tabs include a first electrode tab 242 and a second electrode tab 243. The first electrode tab 242 and the second electrode tab 243 are both disposed on the side of the body 241 facing the first wall 211.

[0107] The main body 241 is the region within the battery cell 20 where the electrode assembly 24 undergoes a chemical reaction. The main body 241 is a structure formed by winding together the region of the positive electrode coated with a positive active material layer, the separator, and the region of the negative electrode coated with a negative active material layer. It primarily functions by the movement of metal ions between the positive and negative electrodes, which have opposite polarities. The first tab 242 and the second tab 243 are portions of the electrode assembly 24 used to guide current into and out of the main body 241, respectively. For example, the first tab 242 guides current into the main body 241, and the second tab 243 guides current out of the main body 241; or, the second tab 243 guides current into the main body 241, and the first tab 242 guides current out of the main body 241.

[0108] In some embodiments, the material of the outer casing 21 can be metal or a combination of metal and non-metal. For example, the outer casing 21 can be made of metal, such as aluminum, copper, iron, aluminum, steel or aluminum alloy; or, for example, some parts of the outer casing 21 can be made of metal, while the rest can be made of non-metal. For example, the first wall 211 can be made of metal, while other parts of the outer casing 21 can be made of non-metallic materials.

[0109] In some embodiments, when assembling the battery cell 20, the electrode assembly 24 can be placed into the housing 21A first, and electrolyte can be filled into the housing 21A. Then, the first wall 211 can be closed onto the opening of the housing 21A to complete the assembly of the battery cell 20. Alternatively, in some embodiments, when assembling the battery cell 20, the electrode assembly 24 can be placed into the housing 21A first, and then the cover plate 21B can be closed onto the opening of the housing 21A. Electrolyte can then be filled into the housing 21A through the injection hole on the cover plate 21B, and then the injection hole can be closed to complete the assembly of the battery cell 20.

[0110] The outer casing 21 can be of various shapes, such as a cylinder or a prism. The shape of the outer casing 21 can be determined according to the specific shape of the electrode assembly 24. For example, if the electrode assembly 24 is a cuboid structure, then a cuboid outer casing 21 can be selected.

[0111] The first wall 211 is part of the structure of the outer shell 21, and the first electrode terminal 22 can be installed insulated on the first wall 211.

[0112] The first wall 211 can be made of conductive materials, such as metals, for example, the first wall 211 can be made of materials such as aluminum, copper, iron, aluminum, steel or aluminum alloy.

[0113] In some embodiments, the first wall 211 may be connected to the housing 21A by welding, bonding, snap-fitting, or other connection methods. In some embodiments, the first wall 211 and the housing 21A may be integrally formed.

[0114] The thickness direction Y of the first wall 211 can be parallel to the height direction of the battery cell 20, the first direction X can be parallel to the length direction of the battery cell 20, and the first direction X can also be parallel to the width direction of the battery cell 20.

[0115] The first end 2531A and the second end 2531B are two opposite ends of the first contact surface 2531 in the first direction X.

[0116] The second end 2531B is closer to the middle of the first wall 211 along the first direction X than the first end 2531A. This can be understood as follows: along the first direction X, the distance between the orthographic projection of the second end 2531B on the first wall 211 and the middle of the first wall 211 along the first direction X is less than the distance between the orthographic projection of the first end 2531A on the first wall 211 and the middle of the first wall 211 along the first direction X.

[0117] The first electrode terminal 22 is a component mounted on the first wall 211. The first electrode terminal 22 is used for electrical connection with the electrode assembly 24, allowing current to flow into or out of the first electrode tab 242. The first electrode terminal 22 and the first electrode tab 242 have the same polarity. In some embodiments, the first electrode terminal 22 is made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal. In some embodiments, the first electrode terminal can be connected to the first electrode tab 242 via a first adapter 23. Exemplarily, the first electrode tab 242 of the electrode assembly 24 is composed of multiple stacked first sub-tabs. One end of the first adapter 23 can be welded to the first electrode tab 242 firstly, and then the other end of the first adapter 23 can be welded to the first electrode terminal 22.

[0118] In some embodiments, the battery cell 20 further includes a second electrode terminal 221. The first electrode terminal 22 and the second electrode terminal 221 are disposed at a distance from each other along a first direction X on the first wall 211. The second electrode terminal 221 is used to electrically connect with the electrode assembly 24, allowing current to flow into or out of the second tab 243 through the second electrode terminal 221. One of the first electrode terminal 22 and the second electrode terminal 221 is used to allow current to flow out of the electrode assembly 24, and the other is used to allow current to flow into the electrode assembly 24. Exemplarily, the second electrode terminal can be connected to the second tab 243 via a second adapter 231. The second tab 243 of the electrode assembly 24 is composed of multiple stacked second sub-tabs. One end of the second adapter 231 can be welded to the second tab 243 first, and then the other end of the second adapter 231 can be welded to the second electrode terminal 221.

[0119] In some embodiments, the first deformable member 25 is located on the side of the first electrode terminal 22 away from the second electrode terminal 221 in the first direction X.

[0120] In some embodiments, the first deformable member 25 is located on the side of the first electrode terminal 22 away from the second electrode terminal 221 in the first direction X, and is located between the first electrode terminal 22 and the second electrode terminal 221.

[0121] In some embodiments, the second tab 243 is electrically connected to the housing 21 of the battery cell 20 to allow current to flow into or out of the second tab 243 through the housing 21. For example, the second tab 243 is electrically connected to the first wall 211 via the second adapter 231.

[0122] The first deformable member 25 is mounted on the first wall 211 and is electrically connected to the first wall 211. In some embodiments, the first deformable member 25 may be made of a metallic material, such as aluminum, copper, iron, steel, alloy or composite metal.

[0123] In some embodiments, the first deformable member 25 may be welded to the inner side of the first wall 211. To improve the structural strength of the weld between the first deformable member 25 and the first wall 211, the material of the first deformable member 25 may be the same as the material of the first wall 211.

[0124] The first deformable member 25 is a structural member that deforms under the internal pressure of the battery cell 20. The first deformable member 25 is used for overcharge protection of the battery cell 20. For example, when the battery cell 20 is in an abuse condition such as overcharging, the internal pressure increases. When the internal pressure reaches a certain level, such as a first threshold, the first deformable member 25 deforms to contact the first electrode terminal 22, thereby conducting the first wall 211 and the first electrode terminal 22, so that the positive and negative electrodes inside the battery cell 20 are short-circuited.

[0125] In some embodiments, the first deformable member 25 may be a flipping piece, which flips under pressure. For example, please refer to... Figure 9 , Figure 9 This is a schematic diagram of the structure of a first deformable member 25 provided in some embodiments of this application. The outer contour of the first deformable member 25 is disk-shaped. The first deformable member 25 includes a first skirt 251, a first flip foil 252, and a first electrical connection portion 253 connected together. The first skirt 251 is located at the edge of the first deformable member 25, and the first electrical connection portion 253 is located in the geometric center region of the first deformable member 25. A first contact surface 2531 is disposed on the side of the first electrical connection portion 253 facing the first electrode terminal 22. The first flip foil 252 is relatively thin and is used to deform and flip under pressure. After the first flip foil 252 flips, it can push the first electrical connection portion 253 toward the first electrode terminal 22, thereby bringing the first contact surface 2531 and the second contact surface 220 into contact.

[0126] For example, please refer to Figure 6 and Figure 7 The first flipping foil 252, in its natural state, collapses in a direction away from the first wall 211. Please refer to... Figure 8When the internal pressure of the battery cell 20 reaches the first threshold, the first flipping foil 252 flips in the direction facing the first wall 211 to push the first electrical connection 253, thereby making the first electrical connection 253 contact the first electrode terminal 22.

[0127] In some embodiments, the first electrode terminal 22 is electrically connected to the first tab 242 via the first adapter 23. The second tab 243 of the electrode assembly 24 can be electrically connected to the housing 21. The second tab 243 has the opposite polarity to the first tab 242. The second tab 243 is directly connected to the housing 21 or via the second adapter 231. Alternatively, the housing 21 is provided with a second electrode terminal 221, which is electrically connected to the housing 21, and the second tab 243 is directly connected to the second electrode terminal 221 or via the second adapter 231. When the internal pressure of the battery cell 20 reaches a first threshold, the first deformable member 25 deforms, short-circuiting the first electrode terminal 22 and the housing 21. This short-circuit causes the positive and negative electrodes inside the battery cell 20 to short-circuit internally. The instantaneously generated large current can melt the electrical connection components inside the battery cell 20, cutting off the charging and discharging circuit of the battery cell 20, thereby providing overcharge protection. The melted electrical connection components may include the first adapter 23 and / or the second adapter 231. For example, the first adapter 23 has a first fusible portion, the thickness or width of which may be smaller than the thickness or width of the rest of the first adapter 23, so that when a large current passes through, the first fusible portion can melt and break the current path between the first tab 242 and the first electrode terminal 22. For example, the second adapter 231 has a second fusible portion, so that when a large current passes through, the second fusible portion can melt and break the current path between the second tab 243 and the second electrode terminal 221 or the housing 21.

[0128] In some embodiments, the first electrode terminal 22 is electrically connected to the first tab 242 via a first adapter 23. The second tab 243 of the electrode assembly 24 can be electrically connected to the second electrode terminal 221. The second tab 243 has the opposite polarity to the first tab 242. The second electrode terminal 221 can be insulatedly mounted to the housing 21, for example, insulatedly mounted to the first wall 211 of the housing 21. The second tab 243 can be electrically connected to the second electrode terminal 221 via the second adapter 231. The second electrode terminal 221 is correspondingly provided with a second deformable member 26, which is electrically connected to the housing 21. The second deformable member 26 is used to deform and contact the second electrode terminal 221 when the internal pressure of the battery cell 20 reaches a second threshold, so as to electrically connect the second electrode terminal 221 to the housing 21.

[0129] The first contact surface 2531 is the side surface of the first deformed member 25 that abuts against the second contact surface 220 of the first electrode terminal 22.

[0130] The first contact surface 2531 is disposed on the side of the first deformable member 25 facing the first electrode terminal 22 in the thickness direction Y. For example, the first contact surface 2531 can be a plane or a curved surface.

[0131] The second contact surface 220 is the side of the first electrode terminal 22 that abuts against the first contact surface 2531 of the first deformable member 25.

[0132] The second contact surface 220 is disposed on the side of the first electrode terminal 22 facing the first deformable member 25 in the thickness direction Y. Exemplarily, the second contact surface 220 can be a plane or a curved surface. It can be understood that in an embodiment where the first contact surface 2531 is a plane, the second contact surface 220 can be a plane adapted to the first contact surface 2531, and in an embodiment where the first contact surface 2531 is a curved surface, the second contact surface 220 can be a curved surface adapted to the first contact surface 2531.

[0133] In some embodiments, the battery cell 20 further includes a third insulating member 29 disposed between the first wall 211 and the electrode assembly 24, and a portion of the third insulating member 29 is located between the first deformable member 25 and the electrode assembly 24.

[0134] Please refer to Figure 8 When the battery cell 20 expands due to long-term use or thermal runaway, the expansion of the edge of the first wall 211 is limited because its periphery is connected to other walls. This results in the main expansion area of ​​the first wall 211 being its central portion in the first direction X. When the internal pressure of the battery cell 20 reaches a certain level, such as a first threshold, the first deformable member 25 deforms and contacts the first electrode terminal 22, short-circuiting the first electrode terminal 22 and the outer casing 21. When the internal pressure of the battery cell 20 reaches a second threshold, the second deformable member 26 deforms, short-circuiting the second electrode terminal 221 and the outer casing 21. This creates an internal short circuit between the positive and negative electrodes of the battery cell 20. The instantaneously generated large current can melt the electrical connection components inside the battery cell 20, cutting off the charging and discharging circuit of the battery cell 20, thus providing overcharge protection. The melted electrical connection components may include the first adapter 23 and / or the second adapter 231. For example, the first adapter 23 has a first fuse portion that can be melted when a large current passes through, thereby breaking the current path between the first tab 242 and the first electrode terminal 22. For example, the second adapter 231 has a second fuse portion that can be melted when a large current passes through, thereby breaking the current path between the second tab 243 and the second electrode terminal 221.

[0135] Specifically, as the distance between the first contact surface 2531 and the second contact surface 220 gradually increases along the thickness direction Y of the first wall 211, the distance between the contact point on the first contact surface 2531 and the corresponding contact point on the second contact surface 220 along the first direction X is within a certain range along the thickness direction Y. This ensures that when the first deformable member 25 deforms due to excessive internal pressure in the outer shell 21 caused by thermal runaway, the pressure inside the outer shell 21 causes a portion of the first contact surface 2531 to contact the second contact surface 220. Subsequently, the distance between the other portion of the first contact surface 2531 and the other portion of the second contact surface 220 along the thickness direction Y is within a certain range, allowing subsequent pressure to cause the other portion of the first contact surface 2531 to contact the other portion of the second contact surface 220. This increases the contact area between the first contact surface 2531 and the second contact surface 220.

[0136] In this embodiment, since the expansion of the middle part of the first wall 211 along the first direction X is greater than the expansion of its edge, the distance between the first contact surface 2531 and the second contact surface 220 in the thickness direction Y is gradually increased along the direction from the first end 2531A to the second end 2531B. This ensures that when the battery cell 20 expands due to long-term use or thermal runaway, the distance between the contact point on the first contact surface 2531 and the corresponding contact point on the second contact surface 220 in the thickness direction Y of the first wall 211 is within a certain range. Furthermore, when the internal pressure of the battery cell 20 exceeds the first threshold due to thermal runaway, causing the first deformable member 25 to deform, the internal pressure of the battery cell 20 can make the first contact surface 2531 and the second contact surface 220 make surface contact, thereby increasing the contact area between the first contact surface 2531 and the second contact surface 220, reducing the risk of melting of the part of the first contact surface 2531 or the second contact surface 220 in contact, so that the first deformable member 25 can effectively play the role of overcharge protection, thereby effectively improving the reliability of the battery cell 20 under abuse conditions such as overcharging, and thus making the battery cell 20 highly reliable.

[0137] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The first direction X is the length direction of the first wall 211, and the dimension of the first wall 211 in its length direction is greater than the dimension of the first wall 211 in its width direction Z.

[0138] The first wall 211 has a larger dimension in its length direction than in its width direction Z, meaning the first wall 211 is a long and narrow plate-like structure. Specifically, the dimension of the first wall 211 in the first direction X is larger than its dimensions in other directions perpendicular to its thickness direction Y. When the first wall 211 expands, the expansion is greater in the middle section of the first wall 211 than in the fifth end 2115 and the sixth end 2116, which are positioned opposite each other in the first direction X.

[0139] In the above technical solution, the first direction X is the length direction of the first wall 211, and the dimension of the first wall 211 in its length direction is greater than the dimension of the first wall 211 in its width direction Z. Since the larger the dimension of the first wall 211 in the first direction X, the greater the expansion of the middle part of the first wall 211 along the first direction X compared to its edges, the arrangement of gradually increasing the distance between the first contact surface 2531 and the second contact surface 220 in the thickness direction Y along the direction from the first end 2531A to the second end 2531B ensures that when the battery cell 20 expands due to long-term use or thermal runaway, the distance between the contact point on the first contact surface 2531 and the corresponding contact point on the second contact surface 220 in the thickness direction Y of the first wall 211 remains within a certain range. This allows the first deformable member 25 to effectively provide overcharge protection, thereby effectively improving the reliability of the battery cell 20 under abuse conditions such as overcharging, and ultimately resulting in high reliability of the battery cell 20.

[0140] According to some embodiments of this application, please refer to Figure 6 and Figure 7 At least one of the first contact surface 2531 and the second contact surface 220 is inclined relative to the outer surface of the first wall 211.

[0141] At least one of the first contact surface 2531 and the second contact surface 220 is inclined relative to the outer surface of the first wall 211. That is, at least one of the first contact surface 2531 and the second contact surface 220 is a plane, and in the direction from the first end 2531A to the second end 2531B, at least one of the first contact surface 2531 and the second contact surface 220 is inclined at an acute angle to the outer surface of the first wall 211. In the direction from the first end 2531A to the second end 2531B, at least one of the first contact surface 2531 and the second contact surface 220 is inclined away from the outer surface of the first wall 211, so that the distance between the first contact surface 2531 and the second contact surface 220 in the thickness direction Y gradually increases in the direction from the first end 2531A to the second end 2531B.

[0142] In some embodiments, the first contact surface 2531 and the second contact surface 220 are both planar, the first contact surface 2531 is inclined relative to the outer surface of the first wall 211, and the second contact surface 220 is inclined relative to the outer surface of the first wall 211.

[0143] In some embodiments, one of the first contact surface 2531 and the second contact surface 220 is inclined relative to the outer surface of the first wall 211, and the other of the first contact surface 2531 and the second contact surface 220 is parallel to the outer surface of the first wall 211.

[0144] In this embodiment of the application, at least one of the first contact surface 2531 and the second contact surface 220 is inclined relative to the outer surface of the first wall 211, that is, at least one of the first contact surface 2531 and the second contact surface 220 is set as a plane. On the one hand, this facilitates the processing of at least one of the first contact surface 2531 and the second contact surface 220. On the other hand, it facilitates the assembly of the battery cell 20 using the first wall 211 as the assembly base, thereby facilitating the manufacturing of the battery cell 20.

[0145] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The first contact surface 2531 is inclined relative to the outer surface of the first wall 211, and the second contact surface 220 is parallel to the outer surface of the first wall 211.

[0146] The first contact surface 2531 is inclined relative to the outer surface of the first wall 211, that is, the first contact surface 2531 is a plane, and in the direction from the first end 2531A to the second end 2531B, the first contact surface 2531 and the outer surface of the first wall 211 are inclined at an acute angle. In the direction from the first end 2531A to the second end 2531B, the first contact surface 2531 is inclined away from the outer surface of the first wall 211.

[0147] The second contact surface 220 is parallel to the outer surface of the first wall 211, that is, the second contact surface 220 is a plane and the second contact surface 220 is perpendicular to the thickness direction Y.

[0148] In this embodiment, the first contact surface 2531 is inclined relative to the outer surface of the first wall 211, and the second contact surface 220 is parallel to the outer surface of the first wall 211. That is, both the first contact surface 2531 and the second contact surface 220 are planar, which facilitates the processing of the first contact surface 2531 and the second contact surface 220. Since the second contact surface 220 is parallel to the outer surface of the first wall 211, the processing difficulty of the first electrode terminal 22 is reduced when processing the first deformed part 25, thereby reducing the manufacturing cost of the battery cell 20.

[0149] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The second contact surface 220 is inclined relative to the outer surface of the first wall 211, and the first contact surface 2531 is parallel to the outer surface of the first wall 211.

[0150] The second contact surface 220 is inclined relative to the outer surface of the first wall 211, that is, the second contact surface 220 is a plane, and in the direction from the first end 2531A to the second end 2531B, the second contact surface 220 and the outer surface of the first wall 211 are inclined at an acute angle. In the direction from the first end 2531A to the second end 2531B, the second contact surface 220 is inclined away from the outer surface of the first wall 211.

[0151] The first contact surface 2531 is parallel to the outer surface of the first wall 211, that is, the first contact surface 2531 is a plane, and the second contact surface 220 is perpendicular to the thickness direction Y.

[0152] In this embodiment, the second contact surface 220 is inclined relative to the outer surface of the first wall 211, and the first contact surface 2531 is parallel to the outer surface of the first wall 211. That is, both the first contact surface 2531 and the second contact surface 220 are planar, which facilitates the processing of the first contact surface 2531 and the second contact surface 220. Since the first contact surface 2531 is parallel to the outer surface of the first wall 211, the processing difficulty of the first deformed part 25 is reduced when processing the first deformed part 25, thereby reducing the manufacturing cost of the battery cell 20.

[0153] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The plane containing the first contact surface 2531 and the plane containing the second contact surface 220 form an angle.

[0154] In this embodiment, the angle between the plane containing the first contact surface 2531 and the plane containing the second contact surface 220, i.e., both the first contact surface 2531 and the second contact surface 220 are flat, facilitates the processing of the first contact surface 2531 and the second contact surface 220, thereby reducing the manufacturing cost of the battery cell 20.

[0155] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The included angle is α, which satisfies 10°≤α≤60°.

[0156] The angle α between the plane containing the first contact surface 2531 and the plane containing the second contact surface 220 can be defined as the acute angle formed between the projection of the first contact surface 2531 onto the plane perpendicular to the width direction Z of the first wall 211 and the projection of the second contact surface 220 onto the plane.

[0157] α can take any point value from 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, or any range between two of them.

[0158] In this embodiment, when α ≥ 10°, after the first wall 211 expands and deforms, causing the first deformable member 25 to move, the distance between the contact point on the first contact surface 2531 and the corresponding contact point on the second contact surface 220 along the first direction X in the thickness direction Y is within a certain range. This allows the first deformable member 25 to deform due to excessive internal pressure caused by thermal runaway, enabling the pressure inside the outer shell 21 to better contact the first contact surface 2531 with the second contact surface 220, thus improving the reliability of the battery cell 20. When α ≤ 60°, with a fixed size of the first contact surface 2531 in the first direction X, the size of the first contact surface 2531 in the thickness direction Y is smaller, thereby reducing the size of the first deformable member 25 in the thickness direction Y. This allows more space inside the outer shell 21 in the thickness direction Y to be used for the installation of other structural components such as the electrode assembly 24, thereby increasing the energy density of the battery cell 20. Therefore, when 10° ≤ α ≤ 60°, the reliability of the battery cell 20 can be improved while increasing its energy density.

[0159] According to some embodiments of this application, please refer to Figure 6 and Figure 7 , 20°≤α≤45°.

[0160] α can take any point value from 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, or any range between two of them.

[0161] In this embodiment, when α ≥ 20°, after the first wall 211 expands and deforms, causing the first deformable member 25 to move, the distance between the contact point on the first contact surface 2531 and the corresponding contact point on the second contact surface 220 along the first direction X in the thickness direction Y is within a certain range. This ensures that when the first deformable member 25 deforms due to excessive internal pressure caused by thermal runaway, the pressure inside the outer shell 21 can better drive the first contact surface 2531 to contact the second contact surface 220, thereby further improving the reliability of the battery cell 20; α ≤ At 45°, with the size of the first contact surface 2531 in the first direction X fixed, the first contact surface 2531 is further reduced in the thickness direction Y, thereby further reducing the size of the first deformable member 25 in the thickness direction Y. This allows more space inside the housing 21 in the thickness direction Y to be used for the installation of other structural components such as the electrode assembly 24, thereby increasing the energy density of the battery cell 20. Therefore, when 20°≤α≤45°, the reliability of the battery cell 20 can be further improved while the energy density of the battery cell 20 can be further increased.

[0162] According to some embodiments of this application, please refer to Figures 5-6 Please refer to Figure 10 , Figure 10 for Figure 6 A partial enlarged view of point A. The first wall 211 is provided with a first through hole 2111, and at least a portion of the first deformable member 25 is connected to the inner surface of the first wall 211 and blocks the first through hole 2111.

[0163] The first through hole 2111 can be a through hole structure formed on the first wall 211. The first contact surface 2531 can make contact with the part of the first electrode terminal 22 located outside the first wall 211 and covering the first through hole 2111 through the first through hole 2111.

[0164] For example, the first through hole 2111 can be formed by machining processes such as milling and drilling, or it can be formed simultaneously with the first wall 211 by integral forming processes such as stamping.

[0165] In some embodiments, please refer to Figure 6 The first through hole 2111 includes a first segment 2111A and a second segment 2111B connected in sequence. The first segment 2111A is connected to the outer surface of the first wall 211, and the second segment 2111B is connected to the inner surface of the first wall 211. The radial dimension of the second segment 2111B is larger than that of the first segment 2111A, so as to form a stepped surface on the hole wall of the first through hole 2111. The first skirt 251 abuts against the stepped surface along the thickness direction Y and is bonded or welded to the hole wall of the second segment 2111B to seal the first through hole 2111.

[0166] In its natural state, the first flip foil 252 is in a collapsed state in the direction away from the first wall 211. When the internal pressure of the battery cell 20 reaches the first threshold, the first flip foil 252 flips in the direction facing the first wall 211 to push the first electrical connection part 253, so that the first electrical connection part 253 passes through the first through hole 2111 and contacts the part of the first electrode terminal 22 located outside the first wall 211 and covering the first through hole 2111.

[0167] In this embodiment, the first wall 211 is provided with a first through hole 2111. At least a portion of the deformable member is connected to the inner surface of the first wall 211 and blocks the first through hole 2111, so that the first through hole 2111 does not affect the sealing performance of the outer shell 21. When the pressure inside the outer shell 21 reaches a certain threshold, the first deformable member 25 can be deformed by the pressure to pass through the first through hole 2111, thereby facilitating the contact between the first contact surface 2531 and the second contact surface 220. The structure is simple and easy to implement.

[0168] According to some embodiments of this application, please refer to Figures 5-8 Please refer to Figure 10 and Figure 11 , Figure 11 This is a schematic diagram of the structure of the first conductive element 22A provided in some embodiments of this application. The first electrode terminal 22 includes the first conductive element 22A and the first electrode post 22B; at least a portion of the first conductive element 22A is located outside the first wall 211; the first electrode post 22B is connected to the first conductive element 22A, and the first wall 211 is provided with a first terminal hole 2112 for the first electrode post 22B to pass through; the battery cell 20 also includes a first insulating element 27; at least a portion of the first insulating element 27 is disposed between the first wall 211 and the conductive element; wherein, the second contact surface 220 is disposed on the first conductive element 22A.

[0169] The first conductive element 22A is used to connect to an external busbar (e.g., a power strip). Exemplarily, the first conductive element 22A is welded to the busbar.

[0170] At least a portion of the first conductive element 22A is located on the outside of the first wall 211, that is, at least a portion of the first conductive element 22A is located on the side of the first wall 211 opposite to the electrode assembly 24.

[0171] The first electrode post 22B is connected to the first electrode tab 242 of the electrode assembly 24. For example, one end of the first electrode post 22B passes through the first terminal hole 2112 and is connected to the first electrode tab 242 through the first adapter 23.

[0172] The other end of the first conductive element 22A away from the electrode assembly 24 is connected to the first pole post 22B. For example, the connection between the first conductive element 22A and the first pole post 22B includes welding, riveting, threaded connection, or integral molding.

[0173] In some embodiments, please refer to Figure 11 The first conductive element 22A and the first pole post 22B are riveted together. The first conductive element 22A is generally plate-shaped and has a first connecting hole 220C. The first pole post 22B is generally columnar, such as cylindrical or polygonal columnar. One end of the first pole post 22B passes through the first terminal hole 2112 of the first wall 211 and is riveted to the first connecting hole 220C. The other end of the first pole post 22B is located inside the housing 21 and is connected to the first tab 242 through the first adapter 23.

[0174] The first terminal hole 2112 can be a through hole structure opened on the first wall 211, which is used to set the first pole post 22B. The first terminal hole 2112 can connect to the interior of the housing 21, so that the first pole post 22B can be electrically connected to the electrode assembly 24 housed in the housing 21.

[0175] For example, the first terminal hole 2112 can be formed by machining processes such as milling and drilling, or it can be formed simultaneously with the first wall 211 by integral forming processes such as stamping.

[0176] Understandably, an insulating structure or insulating element is provided between the outer periphery of the first pole post 22B and the hole wall of the first terminal hole 2112 to insulate and isolate the first pole post 22B and the first wall 211.

[0177] In some embodiments, a first insulating member 27 is provided between the first conductive member 22A and the first wall 211, and the first insulating member 27 is used to insulate and isolate the first conductive member 22A and the first wall 211.

[0178] The first insulating element 27 can be made of a material with a high resistance value, such as organic insulating material, inorganic insulating material or mixed insulating material.

[0179] In some embodiments, the material of the first insulating element 27 may include insulating PPS (polyphenylene sulfide) material.

[0180] In some embodiments, the first insulating element 27 may also be made of other materials with insulating properties, such as polypropylene and polyethylene.

[0181] In some embodiments, the first insulating member 27 is provided with a second through hole 271 corresponding to the first through hole 2111. The first conductive member 22A includes a first body 220A and a first protrusion 220B. The first protrusion 220B protrudes from the side of the first body 220A facing the first wall 211 and is located inside the second through hole 271. A second contact surface 220 is provided on the first protrusion 220B. The first insulating member 27 is also provided with a fifth through hole 272 corresponding to the first terminal hole 2112. The first flipping foil 252 of the first deformable member 25 deforms to drive the first electrical connection portion 253 to pass through the first through hole 2111 and the second through hole 271 in sequence so that the first contact surface 2531 contacts the second contact surface 220. One end of the first pole post 22B passes through the first terminal hole 2112 and the second through hole 271 in sequence and connects to the first conductive member 22A.

[0182] In this embodiment, the first electrode terminal 22 is configured as a separate structure including the first conductive element 22A and the first electrode post 22B, which is easier to manufacture than the case where the first electrode terminal 22 is integral. At the same time, the second contact surface 220 is disposed on the first conductive element 22A. Compared with the case where the second contact surface 220 is disposed on both the first conductive element 22A and the first electrode post 22B, the manufacturing difficulty of the first electrode post 22B is reduced, thereby reducing the manufacturing cost of the battery cell 20.

[0183] According to some embodiments of this application, please refer to Figure 12 and Figure 13 , Figure 12 and Figure 13 This is a cross-sectional view of two battery cells 20 provided in some embodiments of this application at the second electrode terminal 221. The second electrode terminal 221 is disposed on the first wall 211, and the first electrode terminal 22 and the second electrode terminal 221 have opposite polarities; the first electrode terminal 22 and the second electrode terminal 221 are spaced apart along the first direction X.

[0184] In some embodiments, the battery cell 20 further includes a second electrode terminal 221, which is electrically connected to the second tab 243 of the electrode assembly 24 for connection to an external busbar. The polarity of the second electrode terminal 221 is opposite to that of the first electrode terminal 22; for example, if the first electrode terminal 22 is a positive electrode terminal, the second electrode terminal 221 is a negative electrode terminal. The second electrode terminal 221 is used for electrical connection to the electrode assembly 24, allowing current to flow into or out of the second tab 243 via the second electrode terminal 221. In some embodiments, the second electrode terminal 221 is made of a metallic material, such as aluminum, copper, iron, steel, alloys, or composite metals. In some embodiments, the second electrode terminal 221 can be connected to the second tab 243 via a second adapter 231. For example, the second electrode tab 243 of the electrode assembly 24 is composed of multiple second sub-electrodes stacked together. One end of the second adapter 231 can be welded to the second electrode tab 243 first, and then the other end of the second adapter 231 can be welded to the second electrode terminal 221.

[0185] In some embodiments, the second electrode terminal 221 includes a second conductive element 221A and a second electrode post 221B. At least a portion of the first conductive element 22A is located on the side of the first wall 211 opposite to the electrode assembly 24. The second conductive element 221A and the second electrode post 221B are riveted together. The second conductive element 221A is generally plate-shaped and has a second connection hole. The second electrode post 221B is generally columnar, such as cylindrical or polygonal columnar. One end of the second electrode post 221B passes through the second terminal hole 2114 of the first wall 211 and is riveted into the second connection hole. The other end of the second electrode post 221B is located inside the housing 21 and connected to the second electrode tab 243 through the second adapter 231.

[0186] In this embodiment, by setting the second electrode terminal 221 on the first wall 211 and making the first electrode terminal 22 and the second electrode terminal 221 spaced apart along the first direction X, compared with the case where the second electrode terminal 221 and the first electrode terminal 22 are set on different walls of the housing 21, on the one hand, the first electrode terminal 22 and the second electrode terminal 221 occupy the space on the same side of the battery cell 20, making the battery cell 20 occupy less space, which is beneficial to providing the energy density of the battery device 100 with the battery cell 20; on the other hand, the heat generated by the charging and discharging of the battery cell 20 is concentrated on the first wall 211, reducing local overheating of other walls of the battery cell 20, which is convenient for the thermal management of the battery cell 20 and helps to extend the service life of the battery cell 20.

[0187] According to some embodiments of this application, please refer to Figure 12 and Figure 13The second electrode terminal 221 is insulated from the first wall 211. The battery cell 20 also includes a second deformable member 26. The second deformable member 26 is connected to the first wall 211 and has a third contact surface 2631. The second electrode terminal 221 has a fourth contact surface 2210. The second deformable member 26 is configured to deform so that the third contact surface 2631 contacts the fourth contact surface 2210 to electrically connect the second electrode terminal 221 to the first wall 211. The third contact surface 2631 has a third end 2631A and a fourth end 2631B disposed opposite to each other along a first direction X. The fourth end 2631B is closer to the middle of the first wall 211 along the first direction than the third end 2631A. The distance between the third contact surface 2631 and the fourth contact surface 2210 in the thickness direction Y gradually increases along the direction from the third end 2631A to the fourth end 2631B.

[0188] In some embodiments, the second deformable member 26 can be a flip-over piece that flips under pressure. Exemplarily, the outer contour of the second deformable member 26 is disk-shaped, and the second deformable member 26 includes a second skirt 261, a second flip foil 262, and a second electrical connection portion 263 connected together. The second skirt 261 is located at the edge of the second deformable member 26, and the second electrical connection portion 263 is located in the geometric center region of the second deformable member 26. The second flip foil 262 is relatively thin and is used to deform and flip under pressure. After the second flip foil 262 flips, it can push the second electrical connection portion 263 toward the second electrode terminal 221, thereby bringing the second electrical connection portion 263 into contact with the second electrode terminal 221.

[0189] In some embodiments, the first wall 211 is provided with a third through hole 2113, and at least a portion of the second deformable member 26 is connected to the inner surface of the first wall 211 and blocks the third through hole 2113.

[0190] In some embodiments, a second insulating member 28 is provided between the second conductive member 221A and the first wall 211, and the second insulating member 28 is used to insulate and isolate the first conductive member 22A from the first wall 211. The second insulating member 28 is provided with a fourth through hole 281 corresponding to the third through hole 2113 and a sixth through hole 282 corresponding to the second terminal hole 2114. The second flip foil 262 of the second deformable member 26 deforms to drive the second electrical connection portion 263 to pass through the third through hole 2113 and the fourth through hole 281 in sequence, so that the second electrical connection portion 263 abuts against the second conductive member 221A. One end of the first pole post 22B passes through the first terminal hole 2112 and the second through hole 271 in sequence and connects to the first conductive member 22A.

[0191] For example, please refer to Figure 12 and Figure 13The third contact surface 2631 is located on the side of the second electrical connection portion 263 facing the second conductive member 221A. In its natural state, the second flip foil 262 is in a collapsed state away from the first wall 211. When the internal pressure of the battery cell 20 reaches the first threshold, the second flip foil 262 flips towards the direction facing the second wall to push the second electrical connection portion 263, thereby making the second electrical connection portion 263 contact the second electrode terminal 221.

[0192] The distance between the second deformable member 26 and the sixth end 2116 is less than the distance between the second deformable member 26 and the fifth end 2115. That is, the second deformable member 26 is closer to the sixth end 2116 in the first direction X relative to the fifth end 2115. That is, the orthographic projection of the second deformable member 26 on the first wall 211 is not located in the middle of the first wall 211. And that is, the orthographic projection of the first deformable member 25 on the first wall 211 is located between the middle of the first wall 211 and the sixth end 2116.

[0193] The third contact surface 2631 is the side surface of the second deformed member 26 that abuts against the fourth contact surface 2210 of the second electrode terminal 221.

[0194] The third contact surface 2631 is disposed on the side of the second deformable member 26 facing the second electrode terminal 221 in the thickness direction Y. Exemplarily, the third contact surface 2631 can be a plane or a curved surface.

[0195] The fourth contact surface 2210 is the side of the second electrode terminal 221 that abuts against the third contact surface 2631 of the second deformable member 26.

[0196] The fourth contact surface 2210 is disposed on the side of the second electrode terminal 221 facing the second deformable member 26 in the thickness direction Y. Exemplarily, the fourth contact surface 2210 can be a plane or a curved surface. It can be understood that in an embodiment where the third contact surface 2631 is a plane, the fourth contact surface 2210 can be a plane adapted to the first contact surface 2531, and in an embodiment where the third contact surface 2631 is a curved surface, the fourth contact surface 2210 can be a curved surface adapted to the first contact surface 2531.

[0197] In this embodiment, by providing a second deformable member 26, when the internal pressure of the battery cell 20 reaches a certain level, the second deformable member 26 deforms to contact the second electrode terminal 221, thereby making the second electrode terminal 221 electrically connected to the first wall 211. Combined with the contact between the first deformable member 25 and the first electrode terminal 22, the electrical connection components inside the battery cell 20 melt due to the large current generated by the short circuit, thereby cutting off the charging and discharging circuit of the battery cell 20, thus playing the role of overcharge protection and reducing the risk of thermal runaway of the battery cell 20, thereby making the battery have high reliability. Meanwhile, since the expansion of the middle part of the first wall 211 along the first direction X is greater than the expansion of its edge, the setting of gradually increasing the distance between the third contact surface 2631 and the fourth contact surface 2210 in the thickness direction Y along the direction from the third end 2631A to the fourth end 2631B can ensure that when the battery cell 20 expands due to long-term use or thermal runaway, the distance between the contact point on the third contact surface 2631 and the corresponding contact point on the fourth contact surface 2210 in the thickness direction Y of the first wall 211 is within a certain range. Furthermore, when the internal pressure of the battery cell 20 exceeds the second threshold due to thermal runaway, causing the second deformable member 26 to deform, the internal pressure of the battery cell 20 can make the third contact surface 2631 and the fourth contact surface 2210 make surface contact, thereby increasing the contact area between the third contact surface 2631 and the fourth contact surface 2210, reducing the risk of melting of the part of the third contact surface 2631 or the fourth contact surface 2210 in contact, so that the second deformable member 26 can effectively play the role of overcharge protection, thereby effectively improving the reliability of the battery cell 20 under abuse conditions such as overcharging, and thus making the battery cell 20 highly reliable.

[0198] According to some embodiments of this application, the outer casing 21 includes a housing 21A and a cover plate 21B. The housing 21A has an opening, and the cover plate 21B covers the opening. The first wall 211 is the cover plate 21B, or the first wall 211 is the wall portion of the housing 21A opposite to the cover plate 21B.

[0199] The housing 21A is a component used to house the electrode assembly 24.

[0200] The cover plate 21B is a component that covers the opening of the housing 21A to isolate the internal environment of the battery cell 20 from the external environment.

[0201] Understandably, the shape of the cover plate 21B can be adapted to the shape of the shell 21A. For example, if the shell 21A is a cuboid structure, the cover plate 21B can be a rectangular plate structure adapted to the shell 21A. The material of the cover plate 21B can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the cover plate 21B and the shell 21A can be the same or different.

[0202] It is understandable that the first wall 211 can be the cover plate 21B; or, the first wall 211 can also be the wall portion of the housing 21A opposite to the cover plate 21B.

[0203] In the above scheme, the opening design facilitates the inclusion of the electrode assembly 24 within the housing 21A, and the cover plate 21B seals the opening to form a sealed space, thereby providing a stable working environment for the electrode assembly 24 and improving the reliability of the battery cell 20.

[0204] Among them, reference Figure 2 As shown, the battery device 100 may also include a housing 10, in which the battery cells 20 are housed.

[0205] In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the battery cell 20.

[0206] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 together define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0207] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 10 has a rectangular structure.

[0208] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, in... Figure 2 In the battery device 100, a plurality of battery cells 20 are arranged inside the housing 10. The plurality of battery cells 20 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that the plurality of battery cells 20 are connected in both series and parallel. The plurality of battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of the plurality of battery cells 20 is housed inside the housing 10.

[0209] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0210] It should be noted that in some embodiments, the battery device 100 may not have a housing 10. The battery device 100 includes multiple battery cells 20, and the battery device 100 composed of multiple battery cells 20 can be directly assembled to the electrical equipment to provide power to the electrical equipment through the multiple battery cells 20. That is, the housing 10 can be part of the electrical equipment. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0211] According to some embodiments of this application, some embodiments of this application also provide an electrical device, which includes a battery cell 20 as described above, the battery cell 20 being used to provide electrical energy.

[0212] According to some embodiments of this application, a battery cell 20 is provided; please refer to... Figures 3-13 The battery cell 20 includes a casing 21, a first electrode terminal 22, and a first deformable member 25. The housing 21 has a first wall 211; a first electrode terminal 22 is insulated from the first wall 211; a first deformable member 25 is connected to the first wall 211, the first deformable member 25 has a first contact surface 2531, the first electrode terminal 22 has a second contact surface 220, the first deformable member 25 is configured to deform so that the first contact surface 2531 contacts the second contact surface 220 to electrically connect the first electrode terminal 22 to the first wall 211; the first contact surface 2531 has a first end 2531A and a second end 2531B disposed opposite to each other along a first direction X, the second end 2531B is closer to the middle of the first wall 211 along the first direction X relative to the first end 2531A, the first direction X is perpendicular to the thickness direction Y of the first wall 211; wherein, along the direction from the first end 2531A to the second end 2531B, the distance between the first contact surface 2531 and the second contact surface 220 in the thickness direction Y gradually increases.

[0213] In some embodiments, the first contact surface 2531 is inclined relative to the outer surface of the first wall 211, and the second contact surface 220 is parallel to the outer surface of the first wall 211.

[0214] In other embodiments, the second contact surface 220 is inclined relative to the outer surface of the first wall 211, and the first contact surface 2531 is parallel to the outer surface of the first wall 211.

[0215] The angle between the plane containing the first contact surface 2531 and the plane containing the second contact surface 220 is α, which satisfies 20°≤α≤45°.

[0216] The first wall 211 is provided with a first through hole 2111, and at least a portion of the first deformable member 25 is connected to the inner surface of the first wall 211 and blocks the first through hole 2111. The first electrode terminal 22 includes a first conductive member 22A and a first terminal post 22B; at least a portion of the first conductive member 22A is located on the outside of the first wall 211; the first terminal post 22B is connected to the first conductive member 22A, and the first wall 211 is provided with a first terminal hole 2112 for the first terminal post 22B to pass through; the battery cell 20 also includes a first insulating member 27; at least a portion of the first insulating member 27 is disposed between the first wall 211 and the conductive member; wherein, the second contact surface 220 is disposed on the first conductive member 22A. The battery cell 20 also includes a second electrode terminal 221 and a second deformable member 26; the second electrode terminal 221 is insulated from the first wall 211; the second deformable member 26 is electrically connected to the first wall 211 and is configured to deform to contact the second electrode terminal 221, thereby electrically connecting the second electrode terminal 221 to the first wall 211. Along the first direction X, the distance between the second deformable member 26 and the sixth end 2116 is less than the distance between the second deformable member 26 and the fifth end 2115; the second deformable member 26 has a third contact surface 2631, and the second electrode terminal 221 has a fourth contact surface 2210. The second deformable member 26 is configured to deform so that the third contact surface 2631 contacts the fourth contact surface 2210, thereby electrically connecting the second electrode terminal 221 to the first wall 211; wherein, along the direction from the sixth end 2116 to the fifth end 2115, the distance between the third contact surface 2631 and the fourth contact surface 2210 gradually increases in the thickness direction Y of the first wall 211. The outer casing 21 includes a housing 21A and a cover plate 21B. The housing 21A has an opening, and the cover plate 21B seals the opening. The first wall 211 is the cover plate 21B, or the first wall 211 is the wall portion of the housing 21A opposite to the cover plate 21B.

[0217] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0218] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. 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 cell, characterized by, The battery monomer comprises: a housing having a first wall; a first electrode terminal insulatedly arranged on the first wall; a first deformation member connected to the first wall, the first deformation member having a first contact surface, the first electrode terminal having a second contact surface, the first deformation member being configured to be deformed to make the first contact surface contact the second contact surface to electrically connect the first electrode terminal and the first wall; the first contact surface has a first end and a second end oppositely arranged along a first direction, the second end being closer to the middle of the first wall along the first direction than the first end, the first direction being perpendicular to the thickness direction of the first wall; wherein along the direction from the first end to the second end, the distance between the first contact surface and the second contact surface in the thickness direction gradually increases.

2. The battery cell of claim 1, wherein, The first direction is the length direction of the first wall, and the size of the first wall in the length direction is greater than the size of the first wall in the width direction.

3. The battery cell of claim 1, wherein, At least one of the first contact surface and the second contact surface is arranged obliquely relative to the outer surface of the first wall.

4. The battery cell of claim 3, wherein, The first contact surface is arranged obliquely relative to the outer surface of the first wall, and the second contact surface is parallel to the outer surface of the first wall.

5. The battery cell of claim 3, wherein the cathode comprises a lithium metal oxide. The second contact surface is arranged obliquely relative to the outer surface of the first wall, and the first contact surface is parallel to the outer surface of the first wall.

6. The battery cell of claim 1, wherein, The first contact surface and the second contact surface form an included angle.

7. The battery cell of claim 6, wherein the cathode comprises a lithium metal oxide. The included angle is α, and 10°≤α≤60°.

8. The battery cell of claim 7, wherein the cathode comprises a lithium metal oxide. 20°≤α≤45°。 9. The battery cell of claim 1, wherein, The first wall is provided with a first through hole, and at least part of the first deformation member is connected to the inner surface of the first wall and blocks the first through hole.

10. The battery cell of claim 1, wherein, The first electrode terminal comprises: a first conductive member at least partially located outside the first wall; a first pole column connected to the first conductive member, the first wall being provided with a first terminal hole for the first pole column to pass through; The battery monomer further comprises: a first insulating member at least partially arranged between the first wall and the conductive member; wherein the second contact surface is arranged on the first conductive member.

11. The battery cell of any one of claims 1-10, wherein, The battery monomer further comprises: a second electrode terminal arranged on the first wall, the first electrode terminal and the second electrode terminal being opposite in polarity; along the first direction, the first electrode terminal and the second electrode terminal are arranged at intervals.

12. The battery cell of claim 11, wherein, The second electrode terminal is insulatedly arranged on the first wall; The battery monomer further comprises: a second deformation member connected to the first wall, the second deformation member having a third contact surface, the second electrode terminal having a fourth contact surface, the second deformation member being configured to be deformed to make the third contact surface contact the fourth contact surface to electrically connect the second electrode terminal and the first wall; the third contact surface has a third end and a fourth end oppositely arranged along the first direction, the fourth end being closer to the middle of the first wall along the first direction than the third end; wherein along the direction from the third end to the fourth end, the distance between the third contact surface and the fourth contact surface in the thickness direction gradually increases.

13. The battery cell of claim 1, wherein, The housing includes a casing having an opening, and a cover plate covering the opening. The first wall is the cover plate, or the first wall is a wall portion of the casing opposite the cover plate.

14. A battery device characterized by comprising: A plurality of battery cells according to any one of claims 1-13.

15. An electrical device, comprising: A battery cell according to any one of claims 1-13 for providing electrical energy.

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