Battery monomer, battery and electric device

Abstract

The invention discloses a battery monomer, a battery and an electric device, and belongs to the technical field of batteries. The battery cell includes: a case having a first opening; the first end cover assembly is used for covering the first opening, and the first end cover assembly comprises a protruding structure and a first electrode leading-out piece; the electrode assembly is accommodated in the shell, and the electrode assembly comprises a main body part and a tab extending out of the main body part; the isolation component is at least partially arranged between the first electrode lead-out piece and the main body part; wherein the isolation component comprises an opening structure, a reinforcing structure and an isolation plate, the opening structure is convexly arranged on the surface, facing the first end cover assembly, of the isolation plate and is clamped with the convex structure, and the reinforcing structure is connected to the outer side wall of the opening structure, so that the reliability of the single battery can be improved.

Description

Battery cells, batteries and electrical devices Technical Field

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

[0002] With the increasing severity of environmental pollution, the new energy industry has attracted more and more attention. In the new energy industry, battery technology is an important factor in its development.

[0003] The development of battery technology requires consideration of numerous design factors, such as energy density, cycle life, and reliability. Battery cells include a separator, which is positioned between the end cap assembly and the electrode tab to facilitate connection between the tab and the electrode lead-out member of the end cap assembly. The structure of the separator is crucial to the reliability of the battery cell. Therefore, how to design separators to improve battery reliability is a pressing technical challenge.

[0004] Summary of the Invention

[0005] The present application provides a battery cell, a battery, and an electrical device, which can improve the reliability of the battery.

[0006] In a first aspect, a battery cell is provided, comprising: a shell having a first opening; a first end cap assembly for covering the first opening, the first end cap assembly comprising a protruding structure and a first electrode lead-out member; an electrode assembly accommodated in the shell, the electrode assembly comprising a main body and a tab extending from the main body; an isolation member at least partially disposed between the first electrode lead-out member and the main body; wherein the isolation member comprises an opening structure, a reinforcement structure and an isolation plate, the opening structure protruding from the surface of the isolation plate facing the first end cap assembly and being engaged with the protruding structure, and the reinforcement structure being connected to the outer side wall of the opening structure.

[0007] In an embodiment of the present application, the isolation member is at least partially disposed between the first electrode lead-out member and the main body, thereby isolating at least a portion of the tab from the main body of the electrode assembly, thereby reducing the risk of the tab being inserted into the main body when the battery cell is subjected to impact, and reducing the risk of the battery cell short-circuiting. The opening structure of the isolation member is protruding from the surface of the isolation plate facing the first end cover assembly and is engaged with the protruding structure, so that the isolation member can be fixedly connected to the first end cover assembly, thereby reducing the risk of the isolation member moving in the battery cell, and further reducing the risk of the tab being pulled or torn. The reinforcement structure is connected to the outer wall of the opening structure, so that the reinforcement structure can disperse the force exerted on the opening structure and can play a certain reinforcing role on the opening structure, reducing the risk of the opening structure being deformed when subjected to external force, thereby helping to reduce the risk of the tab being torn due to deformation of the opening structure, and thereby helping to improve the reliability of the battery cell.

[0008] In one possible implementation, the isolation member includes a side plate surrounding the outside of the isolation plate, the side plate protruding from the side of the isolation plate away from the main body, and the reinforcement structure is connected between the outer side wall of the opening structure and the side plate.

[0009] In the above technical solution, the side panels surround the outer side of the separator and protrude from the side of the separator facing away from the main body. Thus, the separator and side panels together define a recessed portion that can accommodate at least a portion of the tab. Furthermore, the reinforcement structure is connected between the outer sidewall of the opening structure and the side panels. Thus, if the opening structure is subjected to external forces, the forces acting on the opening structure are dispersed through the reinforcement structure to the side panels of the separator, thereby reducing the risk of deformation of the opening structure, particularly deformation of the opening structure along the thickness of the separator.

[0010] In one possible implementation, the side panel includes two long side walls and two short side walls, the two long side walls are respectively located on both sides of the isolation plate along the first direction, and the two short side walls are respectively located on both sides of the isolation plate along the second direction, the first direction is the width direction of the isolation plate, and the second direction is the length direction of the isolation plate.

[0011] In a possible implementation, the reinforcement structure includes a first reinforcement structure, one end of the first reinforcement structure is connected to the outer side wall of the opening structure, and the other end of the first reinforcement structure is connected to the long side wall.

[0012] In the above technical solution, when the opening structure is subjected to an external force, the force applied to the opening structure can be dispersed to the long side walls through the reinforcement structure, thereby reducing the risk of deformation of the opening structure.

[0013] In one possible implementation, the reinforcement structure includes two first reinforcement structures, each of which is connected to the two long side walls. By providing two first reinforcement structures, the opening structure can be better supported and reinforced, thereby further reducing the risk of deformation of the opening structure.

[0014] In a possible implementation, the two first reinforcement structures are symmetrically arranged along the second direction, so that the opening structure can be supported and reinforced to a greater extent by fewer reinforcement structures.

[0015] In one possible implementation, the reinforcement structure includes a second reinforcement structure, one end of which is connected to the outer side wall of the opening structure, and the other end is connected to the short side wall. In this way, when the opening structure is subjected to external force, the force acting on the opening structure can be dispersed to the short side wall through the reinforcement structure, thereby reducing the risk of deformation of the opening structure.

[0016] In a possible implementation, the outer side wall, the reinforcement structure, the side plate, and the isolation plate enclose a first recessed space, and at least one through hole penetrating the isolation plate is provided on an area of ​​the isolation plate opposite to the first recessed space.

[0017] The first recessed space is a relatively closed space, which makes it easier for electrolyte to accumulate. By providing at least one through-hole penetrating the isolation plate in the area of ​​the isolation plate opposite to the first recessed space, the electrolyte can flow out of the first recessed space from the through-hole, thereby reducing the risk of electrolyte accumulation in the first recessed space.

[0018] In one possible implementation, the opening structure is a regular prism structure, and the reinforcement structure extends through the center of the opening structure. In this way, the reinforcement structure has a longer length, thereby better reinforcing the opening structure and further reducing the risk of deformation of the opening structure.

[0019] In one possible implementation, the isolation plate is provided with a channel, which is arranged in the middle area of ​​the isolation plate along the second direction, the electrode tab passes through the channel and is electrically connected to the first electrode lead-out piece, and the second direction is the length direction of the isolation plate; the opening structure is arranged in the end area of ​​the isolation plate along the second direction.

[0020] In the above technical solution, the channel is arranged in the middle area of ​​the isolation plate along the second direction, and the opening structure is arranged in the end area of ​​the isolation plate along the second direction, so that the channel is convenient for corresponding to the electrode ear and convenient for the electrode ear to pass through the channel and be electrically connected to the first electrode lead-out member.

[0021] In one possible implementation, the isolation plate includes an inclined plate and a connecting plate connecting the inclined plate and the side plate, the inclined plate includes an inclined surface facing away from the main body; along the thickness direction of the isolation plate, the minimum distance between the end of the inclined surface close to the channel and the main body is greater than the minimum distance between the end of the inclined surface away from the channel and the main body; one end of the reinforcement structure is connected to the outer side wall of the opening structure, and the other end is connected to the side plate and the connecting plate.

[0022] By providing an inclined surface, the gap between the isolation plate and the tab can be reduced, which facilitates the positioning and shaping of the tab through the isolation plate, helping to maintain the tab's shape. One end of the reinforcement structure is connected to the outer wall of the opening structure, and the other end is connected to the side plate and the connecting plate. In other words, the reinforcement structure, side plate, and connecting plate have the same intersection point. This allows the reinforcement structure to have a longer length and also helps disperse the force applied to more areas of the isolation member through the reinforcement structure, thereby further enhancing the stability of the opening structure and reducing the risk of deformation of the opening structure.

[0023] In one possible implementation, the separator includes a first sub-separator and a second sub-separator, spaced apart from each other, with a channel formed between the first and second sub-separator. Thus, the first and second sub-separator are positioned relative to each other along a first direction, which is the width of the separator. The first and second sub-separator can position the tab (e.g., the portion of the tab between the end face and the separator) to reduce tab movement and deformation.

[0024] In a possible implementation, along the thickness direction of the isolation plate, a size h1 of the reinforcement structure and a size h2 of the opening structure satisfy: 0.5h2≤h1≤h2.

[0025] When h1≥0.5h2, the reinforcement structure has a more appropriate size in the thickness direction of the isolation plate, so that it can support and reinforce the opening structure; when h1≤h2, the reinforcement structure will not exceed the opening structure in the thickness direction of the isolation plate, which can reduce the risk of interference between the reinforcement structure and other components in the battery cell.

[0026] In a possible implementation, the thickness t of the reinforcement structure satisfies: 0.4 mm ≤ t ≤ 2 mm.

[0027] When t≥0.4mm, the reinforcement structure has a suitable thickness, so that it can provide better support and reinforcement for the opening structure; when t≤2mm, it is easy to prepare the reinforcement structure, which can reduce the risk of uneven surface of the reinforcement structure and uneven thickness at different positions of the reinforcement structure.

[0028] In a possible implementation, the first end cover assembly includes an end cover and an insulating member, the end cover is used to cover the first opening, and the insulating member is provided with the protruding structure.

[0029] In the above technical solution, the end cap covers the first opening of the housing, the first electrode lead on the end cap is electrically connected to the electrode tab, and the protrusion of the insulating member engages with the opening of the isolation member. The provision of the first end cap assembly facilitates the connection of the first end cap assembly, the isolation member, and the electrode assembly.

[0030] In one possible implementation, the housing has a second opening opposite the first opening; the battery cell further includes a second end cap assembly, which is configured to cover the second opening. Thus, the first end cap assembly and the second end cap assembly are configured to cover the first and second openings at both ends of the housing, respectively, thereby facilitating sealing of the housing.

[0031] In one possible implementation, the battery cell further includes an insulating film that is sleeved over the outer surface of the electrode assembly and disposed inside the housing. This isolates the electrode assembly from the housing, reducing the risk of short circuits caused by contact between the electrode assembly and the housing. Furthermore, the insulating film allows the isolation member to be connected to the electrode assembly, facilitating assembly of the battery cell.

[0032] In one possible implementation, the battery cell further includes a side support plate disposed between the electrode assembly and the inner side of the housing. The side support plate supports the electrode assembly and connects the electrode assembly to the isolation member, thereby facilitating assembly of the battery cell.

[0033] In a second aspect, a battery is provided, comprising the battery cell as described in the first aspect and any possible embodiment thereof.

[0034] In a third aspect, an electrical device is provided, comprising the battery described in the second aspect.

[0035] In an embodiment of the present application, the isolation member is at least partially disposed between the first electrode lead-out member and the main body, thereby isolating at least a portion of the tab from the main body of the electrode assembly, thereby reducing the risk of the tab being inserted into the main body when the battery cell is subjected to impact, and reducing the risk of the battery cell short-circuiting. The opening structure of the isolation member is protruding from the surface of the isolation plate facing the first end cover assembly and is engaged with the protruding structure, so that the isolation member can be fixedly connected to the first end cover assembly, thereby reducing the risk of the isolation member moving in the battery cell, and further reducing the risk of the tab being pulled or torn. The reinforcement structure is connected to the outer wall of the opening structure, so that the reinforcement structure can disperse the force exerted on the opening structure and can play a certain reinforcing role on the opening structure, reducing the risk of the opening structure being deformed when subjected to external force, thereby helping to reduce the risk of the tab being torn due to deformation of the opening structure, and thereby helping to improve the reliability of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0037] FIG1 is a schematic structural diagram of a vehicle according to an embodiment of the present application;

[0038] FIG2 is a schematic structural diagram of a battery according to an embodiment of the present invention;

[0039] FIG3 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

[0040] FIG4 is an exploded schematic diagram of a battery cell according to an embodiment of the present application;

[0041] FIG5 is a schematic diagram of the three-dimensional structure of an isolation member according to an embodiment of the present application;

[0042] FIG6 is a top view of an isolation member according to an embodiment of the present application;

[0043] FIG7 is a cross-sectional view of the isolation member in FIG6 along the AA direction;

[0044] FIG8 is a schematic structural diagram of a first end cover assembly according to an embodiment of the present application;

[0045] FIG9 is a schematic structural diagram of region B of the battery cell in FIG3 ;

[0046] FIG10 is an enlarged schematic diagram of region C in FIG9 .

[0047] In the drawings, the drawings are not drawn to scale.

[0048] Reference Numerals: 1: Vehicle; 10: Battery; 30: Controller; 40: Motor; 3: Housing; 2: Battery Cell; 21: Housing; 22: Electrode Assembly; 23: Isolation Member; 24: First End Cap Assembly; 25: Second End Cap Assembly; 26: Insulation Film; 27: Side Support Plate; 211: First Opening; 212: Second Opening; 221: Main Body; 222: Tab; 2221: End Face. 230: Side plate; 231: Opening structure; 232: Connecting portion; 233: Isolation plate; 2330: Channel; 2351: First recessed space; 2331: Inclined plate; 2332: Connecting plate; 2331a: Inclined surface; 2311: Outer wall; 2301: Long side wall; 2302: Short side wall; 233a: First sub-isolating plate; 233b: Second sub-isolating plate; 2310: Second fixing portion; 2312: Guide portion; 2313: Slot portion. 241: Protruding structure; 242: First electrode lead-out member; 2411: First fixing portion; 2412: Transition portion; 2413: Snap portion; 243: End cap; 244: Insulating member; 251: Second electrode lead-out member. DETAILED DESCRIPTION

[0049] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application. That is, the present application is not limited to the described embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0051] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0052] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0053] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, and the embodiments of this application do not limit this. Battery cells are generally divided into cylindrical battery cells and square battery cells based on the packaging method, and the embodiments of this application do not limit this.

[0054] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery pack. A battery generally includes a housing that encloses one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0055] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The current collector uncoated with the positive active material layer protrudes from the current collector coated with the positive active material layer, and the current collector uncoated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The current collector uncoated with the negative active material layer protrudes from the current collector coated with the negative active material layer, and the current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, among others. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The separator can be made of polypropylene (PP) or polyethylene (PE). In addition, the electrode assembly can be a wound structure or a laminated structure, but the embodiments of the present application are not limited to this.

[0056] To meet different power requirements, a battery can include multiple battery cells, where the multiple battery cells can be connected in series, parallel, or in a hybrid connection. Hybrid connection refers to a mixture of series and parallel connections. Optionally, multiple battery cells can first be connected in series, parallel, or in a hybrid connection to form a battery module, and multiple battery modules can then be connected in series, parallel, or in a hybrid connection to form a battery. In other words, multiple battery cells can be directly combined into a battery, or they can first be combined into battery modules, and then the battery modules can be combined into a battery. The battery is further installed in an electrical device to provide electrical energy to the electrical device.

[0057] The development of battery technology must simultaneously consider multiple design factors, such as energy density, cycle life, discharge capacity, charge and discharge rate, reliability, etc., among which the structure of the battery cell is crucial to the performance of the battery cell. The battery cell includes an electrode assembly, an end cover assembly, an isolation member and a shell, wherein the shell is used to accommodate the electrode assembly, the end cover assembly is used to cover the shell, and the isolation member is at least partially arranged between the pole ear and the electrode assembly to facilitate the connection between the pole ear and the electrode lead-out piece of the end cover assembly. During the use or transportation of the battery cell, when the battery cell is subjected to collision, extrusion, etc., the isolation member is prone to movement, thereby affecting the support effect on the pole ear, which is not conducive to improving the reliability of the battery cell. To this end, an opening structure is provided on the isolation member, and a protruding structure that cooperates with the opening structure is provided on the first end cover assembly. The isolation member and the end cover assembly can be fixed by the cooperation of the opening structure and the protruding structure, thereby reducing the risk of movement of the isolation member.

[0058] However, the opening structure of the isolation member is susceptible to deformation when subjected to external forces. For example, when the opening structure is subjected to pressure, the opening structure will expand outward, thereby reducing the size of the opening structure in the thickness direction of the isolation member. In a battery cell, the isolation member and the electrode assembly are in a state of mutual compression. When the size of the opening structure in the thickness direction becomes smaller, a gap appears between the isolation member and the electrode assembly in the thickness direction of the isolation member, causing the electrode assembly to sway between the shells, and the risk of the electrode assembly's tab being torn increases, which is not conducive to improving the reliability of the battery cell.

[0059] In view of this, embodiments of the present application provide a battery cell including an isolation member. Within the isolation member, an outer wall of an opening structure is provided with a reinforcement structure connected to the opening structure. This reinforces the opening structure, reduces the risk of deformation of the opening structure, and improves the reliability of the battery cell.

[0060] The technical solutions described in the embodiments of the present application are applicable to various battery-using devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0061] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as an example.

[0062] For example, as shown in FIG1 , which is a structural diagram of a vehicle according to an embodiment of the present application, the vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery 10 may be provided inside the vehicle 1, and the controller 30 is used to control the battery 10 to power the motor 40. For example, a battery 10 may be provided at the bottom, front or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1, for example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0063] In order to meet different power usage requirements, the battery 10 may include multiple battery cells. For example, as shown in Figure 2, which is a structural diagram of a battery according to an embodiment of the present application, the battery 10 may include multiple battery cells 2. The battery 10 may also include a box body 3, the interior of the box body 3 is a hollow structure, and multiple battery cells 2 are accommodated in the box body 3. For example, multiple battery cells 2 are connected in parallel, in series, or in a mixed combination and placed in the box body 3. The box body 3 may include a first box body 31 and a second box body 32, and the first box body 31 and the second box body 32 cover each other to form the box body 3. Among them, the first box body 31 and the second box body 32 may both be hollow structures with an opening at one end; or the first box body 31 may be a plate-like structure, and the second box body 32 may be a hollow structure with an opening at one end.

[0064] Optionally, the battery 10 may also include other structures, which will not be described in detail here. For example, the battery 10 may also include a busbar component, which is used to achieve electrical connection between multiple battery cells 2, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can achieve electrical connection between the battery cells 2 by connecting the electrode lead-out members of the battery cells 2. Furthermore, the busbar component can be fixed to the electrode lead-out members of the battery cells 2 by welding. The electrical energy of the multiple battery cells 2 can be further led out through the box 3 through the conductive mechanism. Optionally, the conductive mechanism may also belong to the busbar component.

[0065] The number of battery cells 2 can be set to any value based on different power requirements. Multiple battery cells 2 can be connected in series, parallel, or in a hybrid manner to achieve higher capacity or power. Since each battery 10 may include a large number of battery cells 2, for ease of installation, the battery cells 2 can be grouped, with each group of battery cells 2 forming a battery module. The number of battery cells 2 included in a battery module is not limited and can be set according to requirements. A battery can include multiple battery modules, which can be connected in series, parallel, or in a hybrid manner.

[0066] Figure 3 is a schematic diagram of the structure of a battery cell according to an embodiment of the present application, and Figure 4 is a schematic diagram of the exploded structure of a battery cell according to an embodiment of the present application. For example, as shown in Figures 3 and 4, the present embodiment provides a battery cell 2, including: a housing 21, an electrode assembly 22, an isolation member 23, and a first end cap assembly 24.

[0067] The housing 21 has a first opening 211 , and the first end cover assembly 24 is used to cover the first opening 211 .

[0068] The housing 21 may be a hollow structure with an opening on one side or a hollow structure with openings on both sides. For example, the housing 21 may have one opening, which is the first opening 211. For another example, the housing 21 may have openings other than the first opening 211.

[0069] The housing 21 is used to accommodate the electrode assembly 22. The shape of the housing 21 can be determined based on the shape of one or more electrode assemblies 22. For example, as shown in FIG4 , the housing 21 is a hollow rectangular parallelepiped. Embodiments of the present application include but are not limited to this. The housing 21 can also be a hollow cube, cylinder, or other shape.

[0070] The material of the housing 21 can be various, for example, the material of the housing 21 can be metal or plastic. As some examples, the material of the housing 21 can be copper, iron, aluminum, steel, aluminum alloy, etc.

[0071] The first end cap assembly 24 includes a protruding structure 241 and a first electrode lead-out member 242. The first electrode lead-out member 242 is used to electrically connect the electrode assembly 22 to the circuit outside the battery cell 2 to enable charging and discharging of the electrode assembly 22. As an example, at least a portion of the first electrode lead-out member 242 is exposed to the outside of the battery cell 2 to facilitate connection with a busbar component to thereby lead out the electrical energy generated by the electrode assembly 22.

[0072] The electrode assembly 22 is accommodated in the housing 21 . The electrode assembly 22 includes a main body 221 and a tab 222 extending from the main body 221 .

[0073] One end of the main body 221 has an end surface 2221 , and the tab 222 extends from the end surface 2221 .

[0074] The tab 222 may be directly connected to the first electrode lead-out member 242 , or may be indirectly connected to the first electrode lead-out member 242 via other conductive structures.

[0075] There may be multiple tabs 222 , including positive tabs and negative tabs. The positive tabs and negative tabs may be led out from the same end of the main body 221 or from opposite ends of the main body 221 along the thickness direction of the first end cap assembly 24 .

[0076] The tab 222 may include multiple tab layers stacked together to form the tab 222. The tab 222 may include at least two parts, one part located between the main body 221 and the isolation member 23, and the other part located between the isolation member 23 and the first electrode lead 242.

[0077] Figure 5 is a schematic diagram of the three-dimensional structure of the isolation member according to an embodiment of the present application, and Figure 6 is a top view of the isolation member according to an embodiment of the present application. Referring to Figures 4 to 6 , the isolation member 23 is at least partially disposed between the first electrode lead-out member 242 and the main body 221 .

[0078] The isolation member 23 can insulate at least part of the pole ear 222 from the end face 2221 of the main body 221, thereby reducing the risk of the pole ear 222 being inserted into the main body 221 when the battery cell 2 is affected by external impact, vibration, etc., thereby reducing the risk of short circuit of the battery cell 2, which is beneficial to improving the reliability of the battery cell 2.

[0079] The isolation member 23 may be partially disposed between the first electrode lead-out member 242 and the main body 221 , or may be entirely disposed between the first electrode lead-out member 242 and the main body 221 .

[0080] The isolation member 23 can be an integral structure or a split structure. As an example, the isolation member 23 is formed by connecting a plurality of independently formed parts. As another example, the isolation member 23 is formed in one piece by stamping.

[0081] The isolation member 23 includes an opening structure 231 , a reinforcement structure 232 and an isolation plate 233 .

[0082] The isolation plate 233 can be an integrated structure or a split structure, and can insulate and isolate the end surface 2221 of the main body 221 from at least part of the tab 222 .

[0083] The opening structure 231 is protruded from the surface of the isolation plate 233 facing the first end cap assembly 24 and engages with the protruding structure 241. This allows the isolation member 23 to be securely connected to the first end cap assembly 24, thereby reducing the risk of the isolation member 23 moving within the battery cell 2 and, in turn, the risk of the tab 222 being pulled or torn.

[0084] The opening structure 231 has an outer sidewall 2311 and an inner sidewall. The inner sidewall faces the opening of the opening structure 231 , and the outer sidewall 2311 faces away from the opening of the opening structure 231 .

[0085] For example, when the cross section of the opening structure 231 is circular, the opening structure 231 has a cylindrical outer wall 231 ; when the cross section of the opening structure 231 is square, the opening structure 231 has a prismatic outer wall 231 .

[0086] The reinforcement structure 232 is connected to the outer sidewall 2311 of the opening structure 231 . In other words, the reinforcement structure 232 is connected to the outer sidewall 2311 of the opening structure 231 and extends in a direction away from the opening structure 231 .

[0087] Compared to the area of ​​the isolation member 23 without the opening structure 231, the opening structure 231 is weaker and more susceptible to deformation when subjected to external forces. During assembly, transportation, or use of the battery cells, the opening structure 231 may be squeezed. When squeezed, the opening structure 231 will expand outward. In other words, the opening of the opening structure 231 will become larger, and the dimension of the opening structure 231 in the thickness direction of the isolation plate 233 will become smaller.

[0088] The reinforcing structure 232 is connected to the outer wall 2311 of the opening structure 231. In this way, when the opening structure 231 is subjected to external force, the reinforcing structure 232 can disperse the force exerted on the opening structure 231 and can play a certain reinforcing role on the opening structure 231, thereby reducing the risk of deformation of the opening structure 231.

[0089] When the battery cell encounters extrusion, shaking or collision, due to the setting of the reinforcement structure 232, the risk of the opening structure 231 becoming smaller in the thickness direction of the isolation plate 233 is reduced, so that the isolation member 23 and the electrode assembly 22 can maintain a good matching relationship (for example, there will be no gap between the electrode assembly 22 and the isolation plate 233 along the thickness direction of the isolation plate 233), and the electrode assembly 22 will not shake in the shell 21, thereby reducing the risk of the electrode ear 222 of the electrode assembly 22 being torn, which is beneficial to improving the reliability of the battery cell 2.

[0090] Furthermore, the provision of the reinforcement structure 232 facilitates the assembly of the battery cell 2. For example, a battery cell 2 comprising a housing 21, an electrode assembly 22, a first end cap assembly 24, an insulating film 26 for isolating the electrode assembly 22 from the housing 21, and a side support plate 27 for supporting the electrode assembly 22 and positioned between the two housings 21 is used for illustration. During assembly of the protruding structure 241 of the first end cap assembly 24 with the opening structure 231 of the isolation member 23, pressure is applied to the first end cap assembly 24 toward the isolation member 23 to secure the protruding structure 241 with the opening structure 231. By setting the reinforcing structure 232, the opening structure 231 of the isolation member 23 has greater strength, and the risk of deformation of the opening structure 231 in the thickness direction of the isolation plate 233 is reduced, so that the force applied to the first end cover assembly 24 can be transmitted to the electrode assembly 22 through the isolation member 23, thereby pressing the electrode assembly 22 and the isolation member 23; and the force applied to the first end cover assembly 24 will not be transmitted to the insulating film 26 and the side support plate 27 due to the deformation of the opening structure 231, thereby reducing the impact on the insulating film 26 and the side support plate 27, thereby facilitating the assembly of the battery cell 2.

[0091] In the embodiment of the present application, the isolation member 23 is at least partially disposed between the first electrode lead-out member 242 and the main body 221, thereby isolating at least a portion of the tab 222 from the main body 221 of the electrode assembly 22. This reduces the risk of the tab 222 being inserted into the main body 221 when the battery cell 2 is subjected to an impact, thereby reducing the risk of a short circuit in the battery cell 2. The opening structure 231 of the isolation member 23 protrudes from the surface of the isolation plate 233 facing the first end cap assembly 24 and engages with the protruding structure 241. In this way, the isolation member 23 can be fixedly connected to the first end cap assembly 24, thereby reducing the risk of the isolation member 23 moving within the battery cell 2, and further reducing the risk of the tab 222 being pulled or torn. The reinforcement structure 232 is connected to the outer wall 2311 of the opening structure 231. In this way, the reinforcement structure 232 can disperse the force acting on the opening structure 231 and can play a certain reinforcing role on the opening structure 231, thereby reducing the risk of deformation of the opening structure 231 when subjected to external force, thereby helping to reduce the risk of the tab being torn by 222 due to deformation of the opening structure 231, and further helping to improve the reliability of the battery cell 2.

[0092] In some embodiments, the isolation member 23 also includes a side panel 230, which surrounds the outer side of the isolation panel 233 and protrudes from the side of the isolation panel 233 that faces away from the main body 221. The reinforcement structure 232 is connected between the outer side wall 2311 of the opening structure 231 and the side panel 230.

[0093] The side panel 230 may be arranged in a ring shape, for example, a circular ring, a rectangle or other irregular shapes, and the embodiments of the present application include but are not limited to the above.

[0094] The side plate 230 surrounds the outside of the isolation plate 233 and protrudes from the side of the isolation plate 233 facing away from the main body 221. In this way, the isolation plate 233 and the side plate 230 can jointly define a receiving recess that can accommodate at least a portion of the tab 22. In addition, the reinforcement structure 232 is connected between the outer side wall 2311 of the opening structure 231 and the side plate 230. In this way, when the opening structure 231 is subjected to an external force, the force applied to the opening structure 231 can be dispersed to the side plate 230 of the isolation member 23 through the reinforcement structure 232, thereby reducing the risk of deformation of the opening structure 231, especially deformation of the opening structure 231 in the thickness direction of the isolation plate 233.

[0095] In some embodiments, the reinforcement structure 232 extends in a direction away from the opening structure 231 , one end of the reinforcement structure 232 is connected to the outer sidewall 2311 of the opening structure 231 , and the other end does not extend to the side panel 230 .

[0096] In some embodiments, the side panel 230 includes two long side walls 2301 and two short side walls 2302. The two long side walls 2301 are respectively located on both sides of the isolation panel 233 along the first direction, and the two short side walls 2302 are respectively located on both sides of the isolation panel 233 along the second direction. The first direction is the width direction of the isolation panel 233, and the second direction is the length direction of the isolation panel 233.

[0097] For example, as shown in FIG5 and FIG6 , the first direction is the y direction, and the second direction is the x direction.

[0098] The reinforcement structure 232 includes a first reinforcement structure 2321 . One end of the first reinforcement structure 2321 is connected to the outer sidewall 2311 of the opening structure 231 , and the other end is connected to the long sidewall 2301 .

[0099] The first reinforcement structure 2321 may be in the shape of an elongated strip, for example, a straight elongated strip.

[0100] As an example, the first reinforcement structure 2321 is a plate parallel to the first direction. In this way, the force acting on the opening structure 231 can be transmitted and dispersed to the long sidewall 2301 through the first reinforcement structure 2321, thereby reducing the deformation of the opening structure 231 in the thickness direction of the isolation member 23.

[0101] As another example, the first reinforcement structure 2321 is an inclined plate, that is, the first reinforcement structure 2321 is neither parallel to the second direction nor to the first direction. In this way, the first reinforcement structure 2321 can have a longer length, which is conducive to better dispersing the force acting on the opening structure 231 and can better strengthen the opening structure 231.

[0102] When the opening structure 231 is subjected to an external force, the force applied to the opening structure 231 can be dispersed to the long sidewalls 2301 through the reinforcing structure 232 , thereby reducing the risk of deformation of the opening structure 231 .

[0103] In some embodiments, the reinforcement structure 232 includes two first reinforcement structures 2321 , and the two first reinforcement structures 2321 are respectively connected to the two long side walls 2301 .

[0104] By providing two first reinforcement structures 2321 , the opening structure 231 can be better supported and reinforced, thereby further reducing the risk of deformation of the opening structure 231 .

[0105] In some embodiments, two first reinforcement structures 2321 corresponding to one opening structure 231 are symmetrically arranged along the second direction. In this way, the opening structure 231 can be supported and reinforced to a greater extent by fewer reinforcement structures 232 .

[0106] When the isolation member 23 includes two opening structures 231, the isolation member 23 can be correspondingly provided with four first reinforcement structures 2321, wherein the outer side wall 2311 of each opening structure 231 is connected to two first reinforcement structures 2321, and the two first reinforcement structures 2321 are symmetrically arranged along the second direction.

[0107] In some embodiments, the reinforcement structure 232 includes a second reinforcement structure (not shown), one end of the second reinforcement structure is connected to the outer side wall 2311 of the opening structure 231 , and the other end is connected to the short side wall 2302 .

[0108] For example, the extension direction of the second reinforcement structure is parallel to the length direction of the isolation plate 233 , and the second reinforcement structure extends from the outer side wall 2311 to the short side wall 2302 along the length direction of the isolation plate 233 .

[0109] For another example, there is a certain angle between the extension direction of the second reinforcement structure and the length direction of the isolation plate 233. The extension direction is neither parallel to the length direction of the isolation plate 233 nor to the width direction of the isolation plate 233. The second reinforcement structure extends from the outer wall 2311 along the extension direction to the short side wall 2302.

[0110] In this embodiment, when the opening structure 231 is subjected to an external force, the force applied to the opening structure 231 can be dispersed to the short sidewalls 2302 through the reinforcing structure 232 , thereby reducing the risk of deformation of the opening structure 231 .

[0111] In some embodiments, the outer wall 2311, the reinforcing structure 232, the side panel 230 and the isolation panel 233 enclose a first recessed space 2351, and at least one through hole (not shown in the figure) passing through the isolation panel 233 is provided in the area of ​​the isolation panel 233 opposite to the first recessed space 2351.

[0112] The first recessed space 2351 is a relatively closed space, which makes it easier for electrolyte to accumulate. By providing at least one through hole penetrating the isolation plate 233 in the area of ​​the isolation plate 233 opposite to the first recessed space 2351, the electrolyte can flow out of the first recessed space 2351 from the through hole, thereby reducing the risk of electrolyte accumulation in the first recessed space 2351.

[0113] In some embodiments, the opening structure 231 is a regular prism structure, and the extension direction of the reinforcement structure 232 passes through the center of the opening structure 231 .

[0114] The center of the opening structure 231 is the geometric center of the opening structure 231. For example, if the cross-section of the opening structure 231 is circular, the extension direction of the reinforcement structure 232 passes through the center of the circular cross-section. For another example, if the cross-section of the opening structure 231 is square, the extension direction of the reinforcement structure 232 passes through the intersection of the two diagonals of the cross-section.

[0115] The opening structure 231 is a regular prism structure, that is, the cross section of the opening structure 231 can be a regular polygon, for example, a square.

[0116] As another example, the opening structure 231 is a right prism structure or a cylindrical structure, and the cross section of the opening structure 231 is polygonal or circular.

[0117] The extension direction of the reinforcement structure 232 passes through the center of the opening structure 231 . The reinforcement structure 232 has a large length, which is conducive to better reinforcing the structure of the opening structure 231 and further reducing the risk of deformation of the opening structure 231 .

[0118] In some embodiments, the opening structure 231 is a groove extending along the thickness direction of the isolation plate 233 or a hole extending through the isolation plate 233, where the thickness direction of the isolation plate corresponds to the thickness direction of the isolation member 23. Thus, the opening structure 231 is a groove or hole having a certain depth. When the opening structure 231 is squeezed or impacted, the reinforcement structure 232 can strengthen the stability of the opening structure 231, thereby reducing the risk of the opening structure 231 shrinking in the thickness direction of the isolation plate.

[0119] In some embodiments, the cross section of the opening structure 231 is circular, so that the force applied to the opening structure 231 is more uniform, which helps the reinforcement structure 232 to more uniformly disperse the force applied to the opening structure 231 .

[0120] In some embodiments, the isolation plate 233 is provided with a channel 2330, which is arranged in the middle area of ​​the isolation plate 233 along the second direction. The electrode ear 222 passes through the channel 2330 and is electrically connected to the first electrode lead-out member 242. The second direction is the length direction of the isolation plate 233; the opening structure 231 is arranged in the end area of ​​the isolation plate 233 along the second direction.

[0121] The end region is a region closer to the end than the middle region.

[0122] Along the second direction, the size of the channel 2330 is smaller than the size of the isolation plate 233 or the size of the isolation member 23 .

[0123] The channel 2330 is arranged in the middle area of ​​the isolation plate 233 along the second direction, and the opening structure 231 is arranged in the end area of ​​the isolation plate 233 along the direction, so that the channel 2330 corresponds to the electrode tab 222, thereby facilitating the electrode tab 222 to pass through the channel 2330 and be electrically connected to the first electrode lead-out member 242.

[0124] In some embodiments, the opening structure 231 may be disposed in a non-end region of the isolation plate 233 , for example, in a middle region of the isolation plate 233 .

[0125] In some embodiments, the isolation plate 233 includes an inclined plate 2331 and a connecting plate 2332 connecting the inclined plate 2331 and the side plate 230, the inclined plate 2331 includes an inclined surface 2331a facing away from the main body 221; along the thickness direction of the isolation plate 233, the minimum distance between the end of the inclined surface 2331a close to the channel 2330 and the main body 221 is greater than the minimum distance between the end of the inclined surface 2331a away from the channel 2330 and the main body 221; one end of the reinforcement structure 232 is connected to the outer wall 2311 of the opening structure 231, and the other end is connected to the side plate 230 and the connecting plate 2332.

[0126] The inclined plate 2331 has two surfaces opposite to each other along its thickness direction, wherein one surface is an inclined surface 2331 a facing away from the main body 221 , and the other surface is an inclined surface 2331 a facing the main body 221 .

[0127] The tab 222 includes multiple tab layers, which are processed to form the tab 222. The multiple tab layers in the portion of the tab 222 located between the isolation member 23 and the main body 221 form a tab slope after being gathered. The provision of the slope 2331a of the inclined plate 2331 can reduce the gap between the tab 222 and the isolation plate 233, facilitating the positioning and shaping of the tab by the isolation plate 233, thereby helping to maintain the shape of the tab 222.

[0128] The other end of the reinforcement structure 232 is connected to the side panel 230 and the connecting plate 2332. In other words, the other end of the reinforcement structure 232 is connected to the long side wall 2301 and the connecting plate 2332. Thus, the reinforcement structure 232, the long side wall 2301, and the connecting plate 2332 have the same intersection point, and the reinforcement structure 232 has a greater length. Furthermore, the reinforcement structure 232 facilitates distributing the force to more areas of the isolation member 23, thereby further enhancing the stability of the opening structure 231 and reducing the risk of deformation of the opening structure 231.

[0129] In some embodiments, as shown in FIG. 5 , the isolation member 23 further includes a vertical plate 234 , and both ends of the vertical plate 234 along the z direction are respectively connected to the inclined plate 2331 and the bottom surface of the isolation member 23 .

[0130] In some embodiments, the dimension of the inclined plate 2331 along the second direction is smaller than the dimension of the entire isolation plate 233 along the second direction (or, the dimension of the inclined plate 2331 along the second direction is smaller than the dimension of the isolation member 23 along the second direction). That is, in this embodiment, along the second direction, in addition to the inclined plate 2331, the isolation plate 23 also includes another plate-like structure, and the inclined plate 2331 and the other plate-like structure have a certain height difference in the z-direction (or, the inclined plate 2332 protrudes relative to the other plate-like structure toward the first electrode lead-out member 242, and the other plate-like structure may constitute at least a portion of the bottom surface of the isolation member 23).

[0131] In some embodiments, the isolation plate 233 is an integrated structure, that is, the isolation plate 233 can be a rectangular plate-shaped structure, and the length of the isolation plate 233 along the length direction of the isolation member 23 (for example, the x direction in Figure 5) is the same or approximately the same as the length of the isolation member 23.

[0132] In some embodiments, the isolation plate 233 includes a first sub-isolating plate 233 a and a second sub-isolating plate 233 b spaced apart from each other, and a channel 2330 is formed between the first sub-isolating plate 233 a and the second sub-isolating plate 233 b.

[0133] The first sub-isolating plate 233 a and the second sub-isolating plate 233 b are disposed opposite to each other along a first direction, which is the width direction of the isolating plate 233 , such as the y direction in FIG. 5 .

[0134] The first sub-isolating plate 233 a and the second sub-isolating plate 233 b can limit the tab 222 (eg, the tab portion between the end surface 2221 and the isolating plate 233 ) to reduce shaking and deformation of the tab 222 .

[0135] Figure 7 is a cross-sectional view of the isolation member along the AA direction in Figure 6. In some embodiments, as shown in Figure 7 , along the thickness direction of the isolation plate 233 , the dimension h1 of the reinforcement structure 232 and the dimension h2 of the opening structure 231 satisfy: 0.5h2≤h1≤h2.

[0136] For example, as shown in FIG. 5 and FIG. 7 , the thickness direction of the isolation plate 233 is the z direction.

[0137] The ratio of h1 to h2 can be 0.5, 0.7, 0.8, 1 or any value within the above range.

[0138] h1 may be the maximum dimension of the reinforcement structure 332 in the thickness direction of the isolation plate 233, and h2 may be the maximum dimension of the opening structure 231 in the thickness direction of the isolation plate 233. For example, if the opening structure 231 is a groove, h2 is the maximum depth of the groove.

[0139] When h1≥0.5h2, the reinforcement structure 232 has a relatively suitable size in the thickness direction of the isolation plate 233, so that it can support and reinforce the opening structure 231; when h1≤h2, the reinforcement structure 232 will not exceed the opening structure 231 in the thickness direction of the isolation plate 233, which can reduce the risk of interference between the reinforcement structure 232 and other components in the battery cell 2.

[0140] In this embodiment, 0.5h2≤h1≤h2, the reinforcement structure 232 can not only provide strong support and structural reinforcement for the opening structure 231 , but also reduce the risk of interference between the reinforcement structure 232 and other components in the battery cell 2 .

[0141] As an example, along the thickness direction of the isolation plate, the dimension h1 of the reinforcement structure 232 and the dimension h2 of the opening structure 231 are the same.

[0142] In some embodiments, the thickness t of the reinforcement structure 232 satisfies: 0.4 mm ≤ t ≤ 2 mm. t can be 0.4 mm, 1 mm, 1.5 mm, 2 mm, or any value within the above range.

[0143] The thickness t of the reinforcement structure 232 is the average thickness of the reinforcement rib 232, that is, the average of the maximum thickness and the minimum thickness. For a well-made reinforcement structure 232, the thickness of the reinforcement structure 232 is uniform, and the reinforcement structure 232 has the same thickness at different positions along the extension direction of the reinforcement structure 232.

[0144] When t≥0.4mm, the reinforcing structure 232 has a suitable thickness, so that it can better support and reinforce the opening structure 231; when t≤2mm, it is convenient to prepare the reinforcing structure 232, and the risk of uneven surface of the reinforcing structure 232 and uneven thickness at different positions of the reinforcing structure 232 can be reduced.

[0145] In this embodiment, 0.4 mm ≤ t ≤ 2 mm. Thus, the reinforcement structure 232 can provide strong support and structural reinforcement for the opening structure 231 , and is also convenient for preparing the reinforcement structure 232 with uniform thickness and smooth surface.

[0146] Figure 8 is a schematic diagram of the structure of the first end cap assembly according to one embodiment of the present application. Figure 9 is a schematic diagram of the structure of region B of the battery cell in Figure 3 , and Figure 10 is an enlarged schematic diagram of region C in Figure 9 . In some embodiments, as shown in conjunction with Figures 8 to 10 , the first end cap assembly 24 includes an insulating member 244 and an end cap 243 . The end cap 243 is configured to cover the first opening 211 of the housing 21 , and the insulating member 244 is provided with a protruding structure 241 .

[0147] The insulating member 244 is used to isolate the end cover 243 and the electrode assembly 22 . The insulating member 244 and the protruding structure 241 may be integrally formed.

[0148] The first electrode lead-out member 242 is disposed on the end cap 243 of the first end cap assembly 24 , and the tab 222 of the electrode assembly 22 passes through the channel 2330 of the isolation member 23 and is connected to the first electrode lead-out member 242 .

[0149] The end cap 243 may be made of metal and be conductive, and the insulating member 244 may be made of plastic.

[0150] In this embodiment, the provision of the first end cap assembly 24 facilitates the connection of the first end cap assembly 24 , the isolation member 23 , and the electrode assembly 22 .

[0151] In some embodiments, for example, as shown in FIG10 , the protruding structure 241 includes a first fixing portion 2411, a transition portion 2412, and a snap portion 2413 connected in sequence; the opening structure 231 includes a second fixing portion 2310, a guide portion 2312, and a slot portion 2313 connected in sequence. The first fixing portion 2411 and the second fixing portion 2310 abut against each other to facilitate the fixation of the protruding structure 241 and the opening structure 231 in the second direction; the snap portion 2413 snaps into the slot portion 2313 to facilitate the fixation of the protruding structure 241 and the opening structure 231 in the thickness direction of the isolation plate 233; the guide portion 2312 facilitates guiding the protruding structure 241 into the opening structure 231; and the transition portion 2412 facilitates the connection between the first fixing portion 2411 and the snap portion 2413.

[0152] As an example, along the thickness direction of the isolation plate 233 (such as the z direction in Figure 10), the snap portion 2413 will not exceed the slot portion 2313, so that the risk of the snap portion 2413 abutting against the electrode assembly 22 and damaging the electrode assembly 22 can be reduced.

[0153] In some embodiments, the housing 21 has a second opening 212 opposite the first opening 211. The battery cell 2 further includes a second end cap assembly 25, which is used to cover the second opening 212. Thus, the first end cap assembly 24 and the second end cap assembly 25 are used to cover the first opening 211 and the second opening 212 at both ends of the housing 21, respectively, thereby facilitating sealing of the housing 21.

[0154] Specifically, the first end cap assembly 24 and the second end cap assembly 25 are disposed opposite each other along the thickness direction of the isolation plate 233. The housing 21 is provided with a first opening 211 and a second opening 212 that are disposed opposite each other along the thickness direction of the isolation plate 233. The first opening 211 is disposed at one end of the isolation plate 233 that is closer to the isolation member 23, and the second opening 212 is disposed at one end of the isolation plate 233 that is farther from the isolation member 23. The first end cap assembly 24 is configured to cover the first opening 211, and the second end cap assembly 25 is configured to cover the second opening 212. As an example, as shown in FIG3 , the second end cap assembly 25 is further provided with a second electrode lead 251. The polarity of the second electrode lead 251 is opposite to that of the first electrode lead 242 disposed on the first end cap assembly 24.

[0155] As an example, the second end cover assembly 25 has a different structure from the first end cover assembly 24 , and the second end cover assembly 25 is not provided with a protrusion that cooperates with the opening structure 231 .

[0156] In some embodiments, the battery cell 2 further includes an insulating film 26, which is sleeved over the outer surface of the electrode assembly 22 and disposed inside the housing 21. This isolates the electrode assembly 22 from the housing 21, reducing the risk of short circuits caused by contact between the electrode assembly 22 and the housing 21. Furthermore, the insulating film 26 allows the isolation member 23 to be connected to the electrode assembly 22, thereby facilitating assembly of the battery cell 2.

[0157] As an example, the insulating film 26 is an insulating thermoplastic isolation film, such as a Mylar film.

[0158] In one possible implementation, the battery cell 2 further includes a side support plate 27 disposed between the electrode assembly 22 and the inner side of the housing 21. The side support plate 27 supports the electrode assembly 22 and connects the electrode assembly 22 to the isolation member 23, thereby facilitating assembly of the battery cell 2.

[0159] An embodiment of the present application provides a battery, comprising the battery cell 2 described in any one of the above embodiments.

[0160] An embodiment of the present application provides an electrical device, comprising the battery of the above embodiment, wherein the battery is used to supply power to the electrical device.

[0161] The embodiment of the present application provides a battery cell 2, which has high reliability. The battery cell 2 includes a first end cap assembly 24, an isolation member 23, an electrode assembly 22, and a shell 21. The shell 21 is used to accommodate the electrode assembly 22. The first end cap assembly 24 is used to cover the first opening 211 of the shell 21. The first end cap assembly 24 includes a protruding structure 241. The first end cap assembly 24 is provided with a first electrode lead-out member 242. The electrode assembly 22 includes a main body 221 and a tab 222. The isolation member 23 is located between the first electrode lead-out member 242 and the main body 221 of the electrode assembly 22. The isolation member 23 includes an opening structure 231, a reinforcement structure 232, and an isolation plate 233. The opening structure 231 is protruding from the surface of the isolation plate 233 facing the first end cap assembly 24 and is engaged with the protruding structure 241. The reinforcement structure 232 is connected to the outer wall 2311 of the opening structure 231.

[0162] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: A housing (21) having a first opening (211); A first end cap assembly (24), used for covering the first opening (211), the first end cap assembly comprising a protruding structure (241) and a first electrode lead-out member (242); An electrode assembly (22) is accommodated in the housing (21), wherein the electrode assembly (22) comprises a main body (221) and a tab (222) extending from the main body (221); An isolation member (23) at least partially disposed between the first electrode lead-out member (242) and the main body (221); The isolation member (23) comprises an opening structure (231), a reinforcement structure (232) and an isolation plate (233); the opening structure (231) is protruding from the surface of the isolation plate (233) facing the first end cover assembly (24) and is snap-connected with the protruding structure (241); and the reinforcement structure (232) is connected to the outer side wall (2311) of the opening structure (231).

2. The battery cell according to claim 1, characterized in that: The isolation member (23) includes a side plate (230) surrounding the outside of the isolation plate (233), the side plate (230) protruding from the side of the isolation plate (233) away from the main body (221), and the reinforcement structure (232) is connected between the outer side wall (2311) of the opening structure (231) and the side plate (230).

3. The battery cell according to claim 2, characterized in that: The side plate (230) comprises two long side walls (2301) and two short side walls (2302), the two long side walls (2301) are respectively located on both sides of the isolation plate (233) along a first direction, and the two short side walls (2302) are respectively located on both sides of the isolation plate (233) along a second direction, the first direction is the width direction of the isolation plate (233), and the second direction is the length direction of the isolation plate (233).

4. The battery cell according to claim 3, characterized in that: The reinforcement structure (232) comprises a first reinforcement structure (2321), one end of the first reinforcement structure (2321) is connected to the outer side wall (2311) of the opening structure (231), and the other end of the first reinforcement structure (2321) is connected to the long side wall (2301).

5. The battery cell according to claim 4, characterized in that: The reinforcement structure (232) includes two first reinforcement structures (2321), and the two first reinforcement structures (2321) are respectively connected to the two long side walls (2301).

6. The battery cell according to claim 5, characterized in that: The two first reinforcing structures (2321) are symmetrically arranged along the second direction.

7. The battery cell according to any one of claims 3 to 6, characterized in that: The reinforcement structure (232) comprises a second reinforcement structure, one end of which is connected to the outer side wall (2311) of the opening structure (231), and the other end of which is connected to the short side wall (2302).

8. The battery cell according to any one of claims 2 to 7, characterized in that: The outer side wall (2311), the reinforcing structure (232), the side plate (230) and the isolation plate (233) enclose a first recessed space (2351), and at least one through hole penetrating the isolation plate (233) is provided in an area of ​​the isolation plate (233) opposite to the first recessed space (2351).

9. The battery cell according to any one of claims 1 to 8, characterized in that: The opening structure (231) is a regular prism structure, and the extension direction of the reinforcement structure (232) passes through the center of the opening structure (231).

10. The battery cell according to any one of claims 1 to 9, characterized in that: The isolation plate (233) is provided with a channel (2330), the channel (2330) is arranged in the middle area of ​​the isolation plate (233) along the second direction, the electrode tab (222) passes through the channel (2330) and is electrically connected to the first electrode lead-out member (242), and the second direction is the length direction of the isolation plate (233); The opening structure (231) is arranged at an end region of the isolation plate (233) along the second direction.

11. The battery cell according to claim 10, characterized in that: The isolation plate (233) comprises an inclined plate (2331) and a connecting plate (2332) connecting the inclined plate (2331) and the side plate (230); the inclined plate (2331) comprises an inclined surface (2331a) away from the main body (221); along the thickness direction of the isolation plate (233), the minimum distance between an end of the inclined surface (2331a) close to the channel (2330) and the main body (221) is greater than the minimum distance between an end of the inclined surface (2331a) away from the channel (2330) and the main body (221); One end of the reinforcement structure (232) is connected to the outer side wall (2311) of the opening structure (231), and the other end is connected to the side plate (230) and the connecting plate (2332).

12. The battery cell according to claim 10 or 11, characterized in that: The isolation plate (233) comprises a first sub-isolation plate (233a) and a second sub-isolation plate (233b) which are spaced apart from each other, and the channel (2330) is formed between the first sub-isolation plate (233a) and the second sub-isolation plate (233b).

13. The battery cell according to any one of claims 1 to 12, characterized in that: Along the thickness direction of the isolation plate (233), the dimension h1 of the reinforcement structure (232) and the dimension h2 of the opening structure (231) satisfy: 0.5h2≤h1≤h2.

14. The battery cell according to any one of claims 1 to 13, characterized in that: The thickness t of the reinforcement structure (232) satisfies: 0.4 mm ≤ t ≤ 2 mm.

15. The battery cell according to any one of claims 1 to 14, characterized in that: The first end cover assembly (24) comprises an end cover (243) and an insulating member (244); the end cover (243) is used to cover the first opening (211); and the insulating member (244) is provided with the protruding structure (241).

16. The battery cell according to any one of claims 1 to 15, characterized in that: The housing (21) has a second opening (212) opposite to the first opening (211); The battery cell further comprises a second end cover assembly (25), wherein the second end cover assembly (25) is used to cover the second opening (212).

17. The battery cell according to any one of claims 1 to 16, characterized in that: The battery cell further comprises: An insulating film (26), wherein the insulating film (26) is sleeved on the outer surface of the electrode assembly (22) and is arranged on the inner side of the shell (21).

18. The battery cell according to any one of claims 1 to 17, characterized in that: The battery cell further comprises: A side support plate (27), wherein the side support plate (27) is arranged between the electrode assembly (22) and the inner side of the shell (21).

19. A battery, characterized in that: include: A battery cell as claimed in any one of claims 1 to 18.

20. An electrical device, characterized in that: include: The battery as claimed in claim 19.

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