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 housing including a wall portion provided with a first electrode lead-out member; 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; at least part of the isolation component is arranged between the first electrode leading-out piece and the main body part, the isolation component comprises an isolation plate, the isolation plate is provided with a channel, and the tab penetrates through the channel and is electrically connected with the first electrode leading-out piece; the isolation plate is provided with at least one through hole, and the through hole penetrates through the isolation plate in the thickness direction of the isolation plate. According to the technical scheme, the risk that the electrolyte is accumulated in the isolation component can be reduced, and full utilization of the electrolyte is facilitated.

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 within the battery cell. However, electrolyte easily accumulates on the separator, hindering its full utilization. Therefore, providing a separator to reduce the risk of electrolyte accumulation within the separator and ensure full utilization of the electrolyte remains 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 reduce the risk of electrolyte accumulation in an isolation component and fully utilize the electrolyte.

[0006] In a first aspect, a battery cell is provided, comprising: a shell, comprising a wall portion, the wall portion being provided with a first electrode lead-out piece; an electrode assembly, accommodated in the shell, the electrode assembly comprising a main body portion and a tab extending from the main body portion; an isolation member, at least partially disposed between the first electrode lead-out piece and the main body portion, the isolation member comprising an isolation plate, the isolation plate being provided with a channel, the tab passing through the channel and being electrically connected to the first electrode lead-out piece; wherein the isolation plate is provided with at least one through hole, the through hole penetrating the isolation plate along the thickness direction of the isolation plate.

[0007] In an embodiment of the present application, the isolation member can insulate and isolate at least a portion of the passage through which the tab passes 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 impacted, and reducing the risk of a short circuit in the battery cell. The isolation member includes an isolation plate, which is provided with at least one through-hole, and the through-hole passes through the isolation plate along the thickness direction of the isolation plate, so that the electrolyte can flow out of the isolation member through the through-hole, thereby reducing the risk of electrolyte accumulation in the isolation member and facilitating full utilization of the electrolyte. Therefore, the technical solution of the embodiment of the present application can reduce the risk of electrolyte accumulation in the isolation member, which is conducive to full utilization of the electrolyte.

[0008] In one possible implementation, the isolation member further includes a side plate that surrounds the outside of the isolation plate and protrudes from a side of the isolation plate facing away from the main body, thereby defining a receiving recess together with the isolation plate. The tab is at least partially received in the receiving recess. This allows at least a portion of the tab to be received in the receiving recess, thereby facilitating connection between the tab and the electrode lead.

[0009] In one possible implementation, the through hole is disposed on the separator plate near the side plate. This places the through hole closer to the edge of the separator member, facilitating electrolyte outflow through the through hole, thereby further reducing the risk of electrolyte accumulation in the separator member.

[0010] 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, 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; at least one through hole is provided on the connecting plate.

[0011] The inclined surface reduces the gap between the separator and the tab, facilitating positioning and shaping of the tab through the separator, thereby maintaining the tab's shape. Providing at least one through-hole on the connecting plate, closer to the edge of the separator, facilitates the flow of electrolyte from the separator.

[0012] In one possible implementation, the isolation member further includes: an opening structure, which is arranged in the end area of ​​the isolation plate along a first direction and extends from the surface of the isolation plate away from the main body toward the direction close to the wall portion, and the first direction is the length direction of the isolation plate; a connecting portion, which is connected to the outer wall of the opening structure and extends to the side plate in a direction away from the opening structure; the outer wall, the connecting portion, the side plate and the isolation plate enclose a first recessed space, and at least one through hole is provided on the area of ​​the isolation plate opposite to the first recessed space.

[0013] In the above technical solution, by providing a connecting portion connected to the outer wall of the opening structure and extending away from the opening structure, the connecting portion can disperse the force acting on the opening structure and provide a certain degree of reinforcement for the opening structure, reducing the risk of deformation of the opening structure under external forces. This helps reduce the risk of tab tearing caused by deformation of the opening structure, thereby improving the reliability of the battery cell. In addition, the outer wall, connecting portion, side plate, and separator together form a first recessed space. The first recessed space is a relatively closed space that facilitates the accumulation of electrolyte. By providing at least one through-hole in the region of the separator opposite the first recessed space, electrolyte can flow out of the first recessed space through the through-hole, thereby reducing the risk of electrolyte accumulation in the first recessed space.

[0014] In a possible implementation, the connecting portion extends through the center of the opening structure. In this way, the connecting portion has a greater length, thereby facilitating a better structural reinforcement of the opening structure and further reducing the risk of deformation of the opening structure.

[0015] 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 second direction, and the two short side walls are respectively located on both sides of the isolation plate along the first direction, and the second direction is the width direction of the isolation plate; the ends of the two connecting parts close to the opening structure are respectively connected to the outer side walls of the opening structure, and the ends of the two connecting parts away from the opening structure are respectively connected to the two long side walls, and the two connecting parts, the two long side walls, one of the two short side walls and the isolation plate enclose two first recessed spaces.

[0016] In the above technical solution, two connecting parts, two long side walls, one short side wall and the isolation plate are enclosed to form two first recessed spaces, and at least one through hole is provided at a position of the isolation plate corresponding to the first recessed space. In this way, the electrolyte in the two first recessed spaces can flow out through the through hole, reducing the risk of electrolyte accumulation in the first recessed space.

[0017] In a possible implementation, the two connecting portions are symmetrically arranged along the first direction, so that the opening structure can be supported and reinforced to a greater extent by fewer connecting portions.

[0018] In a possible implementation, along the thickness direction of the isolation plate, a size h1 of the connection portion and a size h2 of the opening structure satisfy: 0.5h2≤h1≤h2.

[0019] When h1≥0.5h2, the connecting portion has a more appropriate size in the thickness direction, thereby supporting and reinforcing the opening structure; when h1≤h2, the connecting portion will not exceed the opening structure in the thickness direction, thereby reducing the risk of interference between the connecting portion and other components in the battery cell.

[0020] In a possible implementation, the thickness t of the connecting portion satisfies: 0.4 mm ≤ t ≤ 2 mm.

[0021] When t≥0.4mm, the connection part has a suitable thickness, which can provide better support and reinforcement for the opening structure; when t≤2mm, the preparation of the connection part is facilitated, which can reduce the risk of uneven surface of the connection part and uneven thickness at different positions of the connection part.

[0022] In one possible implementation, the distance L between the through-hole and the side plate along the second direction (the second direction being the width of the separator) satisfies the following: 0 mm ≤ L ≤ 1 mm. When L ≤ 1 mm, electrolyte flow through the through-hole is more facilitated. When L ≥ 0 mm, the through-hole maintains an appropriate distance from the side plate, facilitating its fabrication.

[0023] In one possible implementation, the cross-sectional area S of the through-hole satisfies the following conditions: 0.19 mm² ≤ S ≤ 20 mm². When S ≤ 20 mm², the cross-sectional area of ​​the through-hole is not too large, thereby providing the isolation member with high structural strength. When S ≥ 0.19 mm², the cross-sectional area of ​​the through-hole is not too small, thereby facilitating the outflow of electrolyte through the through-hole. Therefore, this arrangement facilitates the outflow of electrolyte from the isolation member while maintaining the structural strength of the isolation member.

[0024] 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 second 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.

[0025] In a possible implementation, the through hole is circular in shape, which facilitates the preparation of the through hole and helps to simplify the preparation complexity of the isolation component.

[0026] In one possible implementation, the diameter D of the through-hole satisfies the following: 0.5 mm ≤ D ≤ 5 mm. When D ≤ 5 mm, the through-hole is not too large, thereby providing the isolation member with high structural strength. When D ≥ 0.5 mm, the through-hole is not too small, thereby facilitating the outflow of electrolyte through the through-hole. Therefore, this arrangement facilitates the outflow of electrolyte from the isolation member while maintaining the isolation member's structural strength.

[0027] In a possible implementation, the housing includes a shell and a first end cover assembly, the first end cover assembly is used to cover the opening at one end of the shell, the first end cover assembly is provided with a protruding structure, and the opening structure is snap-connected with the protruding structure.

[0028] In the above technical solution, the opening structure of the isolation member can be engaged with the protruding structure of the first end cap assembly to facilitate the fixation between the isolation member and the first end cap assembly. This facilitates the fixation between the isolation member and the first end cap assembly and reduces the risk of the tab being torn due to movement of the isolation member.

[0029] 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 opening at one end of the shell, the insulating member is provided with the protruding structure, and the end cover is the wall portion.

[0030] In the above technical solution, the end cap covers the opening at one end 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.

[0031] In one possible implementation, the housing further includes a second end cap assembly, which is used to cover the opening at the other end of the housing. In this way, the first end cap assembly and the second end cap assembly are respectively used to cover the openings at both ends of the housing, thereby facilitating sealing of the housing.

[0032] 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 outer casing. This isolates the electrode assembly from the outer casing, reducing the risk of short circuits caused by contact between the electrode assembly and the outer casing. Furthermore, the insulating film allows the isolation member to be connected to the electrode assembly, facilitating assembly of the battery cell.

[0033] 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.

[0034] In a second aspect, a battery is provided, comprising a battery cell as described in the first aspect and any possible implementation thereof.

[0035] In a third aspect, an electrical device is provided, comprising the battery described in the second aspect.

[0036] In an embodiment of the present application, the isolation member can insulate and isolate at least a portion of the passage through which the tab passes 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 impacted, and reducing the risk of a short circuit in the battery cell. The isolation member includes an isolation plate, which is provided with at least one through-hole, and the through-hole passes through the through-hole along the thickness direction of the isolation plate, so that the electrolyte can flow out of the isolation member through the through-hole, thereby reducing the risk of electrolyte accumulation in the isolation member and facilitating full utilization of the electrolyte. Therefore, the technical solution of the embodiment of the present application can reduce the risk of electrolyte accumulation in the isolation member, which is conducive to full utilization of the electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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.

[0038] FIG1 is a schematic structural diagram of a vehicle according to an embodiment of the present application;

[0039] FIG2 is a schematic structural diagram of a battery according to an embodiment of the present invention;

[0040] FIG3 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

[0041] FIG4 is an exploded schematic diagram of a battery cell according to an embodiment of the present application;

[0042] FIG5 is a schematic diagram of the three-dimensional structure of an isolation member according to an embodiment of the present application;

[0043] FIG6 is a top view of an isolation member according to an embodiment of the present application;

[0044] FIG7 is a cross-sectional view of the isolation member in FIG6 along the AA direction;

[0045] FIG8 is an enlarged schematic diagram of region E of the isolation member in FIG6 ;

[0046] FIG9 is a schematic structural diagram of a first end cover assembly according to an embodiment of the present application;

[0047] FIG10 is a schematic structural diagram of region B of the battery cell in FIG3 ;

[0048] FIG11 is an enlarged schematic diagram of region C in FIG10 .

[0049] In the drawings, the drawings are not drawn to scale.

[0050] Reference Numerals: 1: Vehicle; 10: Battery; 30: Controller; 40: Motor; 3: Housing; 2: Battery Cell; 20: Housing; 21: Casing; 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; 2350: Accommodating recess; 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-isolator; 233b: Second sub-isolator; 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

[0051] 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, i.e., the present application is not limited to the described embodiments.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] The development of battery technology requires simultaneous consideration of multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate, and reliability. The structure of a battery cell is crucial to its performance. A battery cell comprises an electrode assembly, a separator, and a housing. The housing houses the electrode assembly, and the walls of the housing are provided with electrode leads. The separator supports the tabs of the electrode assembly, facilitating electrical connection between the tabs and the electrode leads of the housing. However, electrolyte easily accumulates in the separator, hindering its full utilization.

[0060] In view of this, embodiments of the present application provide a battery cell in which an isolation member includes an isolation plate having at least one through-hole extending therethrough. This allows electrolyte to flow out of the isolation member through the through-hole, thereby reducing the risk of electrolyte accumulation in the isolation member and facilitating full utilization of the electrolyte.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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 20, an electrode assembly 22, and an isolation member 23.

[0068] The housing 20 includes a wall portion, and the wall portion is provided with a first electrode lead-out member 242 .

[0069] The housing 20 is used to accommodate the electrode assembly 22. The shape of the housing 20 can be determined based on the shape of one or more electrode assemblies 22. For example, as shown in FIG4 , the housing 20 is a hollow rectangular parallelepiped. Embodiments of the present application include but are not limited to this. The housing 20 can also be a hollow cube, cylinder, or other shape.

[0070] The material of the housing 20 can be various, for example, the material of the housing 20 can be metal or plastic. As some examples, the material of the housing 20 can be copper, iron, aluminum, steel, aluminum alloy, etc.

[0071] The housing 20 may have six outer walls, and the wall portion of the housing 20 may refer to one outer wall of the housing 20 , and the wall portion is provided corresponding to the isolation member 23 .

[0072] The wall portion is provided with a first electrode lead-out member 242, which 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 the busbar component, thereby leading out the electrical energy generated by the electrode assembly 22.

[0073] The electrode assembly 22 is accommodated in the housing 20 . The electrode assembly 22 includes a main body 221 and a tab 222 extending from the main body 221 .

[0074] One end of the main body 221 has an end surface 2221 , and the tab 222 extends from the end surface 2221 .

[0075] 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.

[0076] There may be multiple tabs 222. The multiple tabs 222 include 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 wall.

[0077] 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.

[0078] 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 .

[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 isolation plate 233 . The isolation plate 233 defines a channel 2330 . The electrode tab 222 passes through the channel 2330 and is electrically connected to the first electrode lead-out member 242 .

[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 a portion of the tab 222 that passes through the channel 2330 .

[0083] The isolation member 23 is at least partially arranged between the first electrode lead-out member 242 and the main body 221. The isolation member 23 can insulate and isolate at least part of the pole ear 222 passing through the channel 2330 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.

[0084] As an example, the isolation plate 233 is an integrated structure, that is, the isolation plate 233 can be a rectangular plate structure, and the length of the isolation plate 233 along the length direction of the isolation member 23 (such as the x direction in Figure 5) is the same or approximately the same as the length of the isolation member 23.

[0085] The isolation plate 233 is provided with at least one through hole 237 , and the through hole 237 penetrates the isolation plate 233 along the thickness direction of the isolation plate 233 .

[0086] The at least one through-hole 237 may include one, two, three or more through-holes 237 .

[0087] 3 and 4 , the thickness direction of the isolation plate 233 is the z direction. The thickness direction of the isolation plate 233 may also be referred to as the height direction of the isolation member 23. The thickness direction of the isolation plate 233 may be perpendicular to the width and length directions of the isolation plate 233.

[0088] The electrolyte can flow out of the isolation member 23 through the through hole 237, thereby reducing the risk of electrolyte accumulation in the isolation member 23, thereby facilitating full utilization of the electrolyte.

[0089] The placement of the electrolyte within the battery cell 2 is crucial to the performance of the battery cell 2, such as its cycling performance. By providing a battery cell including the aforementioned isolation member 23, the risk of electrolyte accumulation within the isolation member 23 is reduced, allowing the electrolyte to flow out of the isolation member 23 to provide more electrolyte for the electrode assembly 22, thereby fully utilizing the electrolyte and improving the performance of the battery cell 2.

[0090] In the embodiment of the present application, the isolation member 23 can insulate at least a portion of the passage 2330 of the tab 222 from the main body 221 of the electrode assembly 22, thereby reducing the risk of the tab 222 being inserted into the main body 221 when the battery cell 2 is subjected to an impact, and reducing the risk of a short circuit in the battery cell 2. The isolation member 23 includes an isolation plate 233, which is provided with at least one through-hole 237 extending through the isolation plate 233 along the thickness direction of the isolation plate 233. In this way, the electrolyte can flow out of the isolation member 23 through the through-hole 237, thereby reducing the risk of electrolyte accumulation in the isolation member 23 and facilitating full utilization of the electrolyte. Therefore, the technical solution of the embodiment of the present application can reduce the risk of electrolyte accumulation in the isolation member 23, which is conducive to full utilization of the electrolyte.

[0091] In some embodiments, the isolation member 23 also includes a side plate 230, which surrounds the outer side of the isolation plate 233, and the side plate 230 protrudes from the side of the isolation plate 233 away from the main body 221 to jointly define an accommodating recess with the isolation plate 233; at least a portion of the pole ear 222 is accommodated in the accommodating recess 2350.

[0092] The portion of the electrode tab 222 that passes through the channel 2330 is received in the receiving recess 2350 , thereby facilitating the connection between the electrode tab 222 and the first electrode lead-out member 242 .

[0093] As an example, the isolation member 23 is in a rectangular or substantially rectangular shape, so that the side panel 230 may include two long side walls 2301 with a longer length and two short side walls 2302 with a shorter length, and the long side walls 2301 and the short side walls 2302 are connected in sequence.

[0094] In this embodiment, the electrolyte is more likely to accumulate in the accommodating recess 2350 . By providing the through hole 237 on the isolation plate 233 , the risk of the electrolyte accumulating in the accommodating recess 2350 can be reduced.

[0095] In some embodiments, the through hole 237 is disposed on the isolation plate 233 near the side plate 230 .

[0096] As an example, the isolation plate 233 is connected to the long side wall 2301, and the through hole 237 is provided at an end of the isolation plate 233 closer to the long side wall 2301 along the second direction, where the second direction is the width direction of the isolation plate 233. In other words, the minimum distance between the through hole 237 and the end of the isolation plate 233 farther from the long side wall 2301 (or the end of the isolation plate 233 closer to the channel 2330) is greater than zero.

[0097] As another example, the isolation plate 233 is connected to the short side wall 2302 , and along the first direction, the through hole 237 is provided at one end of the isolation plate 233 close to the short side wall 2302 .

[0098] In this embodiment, the through-hole 237 is closer to the edge of the isolation member 23. Compared to a through-hole 237 positioned closer to the center of the isolation member 23, this placement of the through-hole 237 is adaptable to a wider range of isolation member 23 placements and battery cell 2 placements. In other words, for various isolation member 23 or battery cell 2 placements, the above-described placement of the through-hole 237 facilitates the electrolyte's discharge from the isolation member 23 through the through-hole 237. This further facilitates the electrolyte's discharge through the through-hole 237, thereby further reducing the risk of electrolyte accumulation in the isolation member 23.

[0099] 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, 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; at least one through hole 237 is provided on the connecting plate 2332.

[0100] The inclined plate 2331 has two surfaces facing 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 facing the main body 221 .

[0101] 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.

[0102] The connecting plate 2332 is closer to the side plate 230 than the inclined plate 2331 . Providing a through hole 237 on the connecting plate 2332 is more conducive to the outflow of the electrolyte, which can further reduce the risk of electrolyte accumulation in the isolation component 23 .

[0103] 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 .

[0104] In some embodiments, the dimension of the inclined plate 2331 along the first direction is smaller than the dimension of the entire isolation plate 233 along the first direction (or, the dimension of the inclined plate 2331 along the first direction is smaller than the dimension of the isolation member 23 along the first direction). That is, in this embodiment, along the first 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).

[0105] In some embodiments, the isolation member 23 further includes an opening structure 231 and a connecting portion 232 .

[0106] The opening structure 231 is provided at an end region of the isolation plate 233 along a first direction and extends from a surface of the isolation plate 233 facing away from the main body 221 toward the wall. The first direction is the length direction of the isolation plate 233. For example, as shown in FIG5 and FIG6 , the first direction is the x-direction.

[0107] The end region is a region closer to the end than the middle region.

[0108] The opening structure 231 can be provided at one end of the isolation member 23 in the first direction, or at both ends of the isolation member 23 in the first direction. In other words, the isolation member 23 can be provided with one opening structure 231 or two opening structures 231 .

[0109] The opening structure 231 can cooperate with the structure of the wall portion of the housing 20 provided with the first electrode lead-out member 242 to achieve fixation between the isolation member 23 and the housing 20. The opening structure 231 can be a groove or a hole.

[0110] The cross section of the opening structure 231 can be circular, square, or polygonal. The opening structure 231 has a certain size in the thickness direction of the isolation member 23, that is, the opening structure 231 has a certain depth. In other words, the opening structure 231 is a structure with a certain volume.

[0111] 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 .

[0112] 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 .

[0113] The connecting portion 232 is connected to the outer sidewall 2311 of the opening structure 231 and extends to the side plate 230 in a direction away from the opening structure 231 .

[0114] As an example, the connecting portion 232 extends along the second direction, and the connecting portion 232 extends from the outer side wall 2311 to the long side wall 2301 .

[0115] As another example, in combination with Figures 5 and 6, the extension direction of the connecting portion 232 has a certain angle with the first direction and the second direction, that is, the connecting portion 232 is arranged at an angle, and the connecting portion 232 extends from the outer side wall 2311 to the long side wall 2301 of the side panel 230.

[0116] By providing a connecting portion 232 that is connected to the outer wall 2311 of the opening structure 231 and extends in a direction away from the opening structure 231, the connecting portion 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 the opening structure 231 being deformed when subjected to external force, thereby helping to reduce the risk of the tab 222 being torn due to deformation of the opening structure 231, and further helping to improve the reliability of the battery cell 2.

[0117] The outer side wall 2311 , the connecting portion 232 , the side plate 230 and the isolation plate 233 enclose a first recessed space 2351 . At least one through hole 237 is defined in a region of the isolation plate 233 opposite to the first recessed space 2351 .

[0118] The first recessed space 2351 is a relatively closed space, so electrolyte is more likely to accumulate in the first recessed space 2351. Providing at least one through-hole 237 in the area of ​​the separator 233 opposite the first recessed space 2351 helps reduce the risk of electrolyte accumulating in the first recessed space 2351.

[0119] In some embodiments, a plurality of through holes 237 are provided on one end of the separator 233 along the second direction close to the side plate 230 , and the plurality of through holes 237 are spaced apart along the first direction, so as to facilitate the electrolyte to flow out of the first recessed space 2351 .

[0120] As an example, the accommodating recess 2350 may include a first recess space 2351. That is, the accommodating recess 2350 may be a recess formed entirely by the isolation member 23.

[0121] In some embodiments, the extending direction of the connecting portion 232 passes through the center of the opening structure 231 .

[0122] 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 connecting portion 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 connecting portion 232 passes through the intersection of the two diagonals of the cross-section.

[0123] In this embodiment, the extension direction of the connecting portion 232 passes through the center of the opening structure 231. The connecting portion 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.

[0124] 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 plate 233 along the second direction, and the two short side walls 2302 are respectively located on both sides of the isolation plate 233 along the first direction, and the second direction is the width direction of the isolation plate 233; the ends of the two connecting portions 232 close to the opening structure 231 are respectively connected to the outer side walls 2311 of the opening structure 231, and the ends of the two connecting portions 232 away from the opening structure 231 are respectively connected to the two long side walls 2301, and the two connecting portions 232, the two long side walls 2301, one of the two short side walls 2302 and the isolation plate 233 enclose two first recessed spaces 2351.

[0125] Two connecting parts 232, two long side walls 2301, one short side wall 2302 and the isolation plate 233 are enclosed to form two first recessed spaces 2351. At least one through hole 237 is provided at a position of the isolation plate 233 corresponding to the first recessed space 2351. In this way, the electrolyte in the two first recessed spaces 2351 can flow out through the through hole 237, reducing the risk of electrolyte accumulation in the first recessed space 2351.

[0126] The two long side walls 2301, the four connecting structures 232, and the isolation plate 233 can also enclose to form a second storage space, which has a channel 2330; at least one through hole 237 is provided on the area of ​​the isolation plate 233 corresponding to the second storage space, thereby reducing the risk of electrolyte accumulation in the second storage space.

[0127] In some embodiments, the two connection portions 232 are symmetrically arranged along the first direction.

[0128] The two connecting portions 232 are connected to the same opening structure 231 .

[0129] In this embodiment, the two connection portions 232 are symmetrically arranged along the first direction, and the opening structure 231 can be supported and reinforced to a greater extent by fewer connection portions 232 .

[0130] When two opening structures 231 are provided along the first direction and two connecting portions 232 are provided on the outer side wall of one opening structure 231 , four first recessed spaces 2351 are provided in the isolation member 23 .

[0131] In some embodiments, the connecting portion 232 extends through the center of the opening structure 231, with one end of the connecting portion 232 connected to the outer sidewall 2311 and the other end connected to the connecting plate 2332 and the long sidewall 2301. This helps distribute the force to more areas of the isolation member 23 through the connecting portion 232, thereby further enhancing the stability of the opening structure 231 and reducing the risk of deformation of the opening structure 231.

[0132] 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 (e.g., the z direction in Figure 7 ), the dimension h1 of the connection portion 232 and the dimension h2 of the opening structure 231 satisfy the following relationship: 0.5h2≤h1≤h2.

[0133] The ratio of h1 to h2 can be 0.5, 0.7, 0.8, 1 or any value within the above range.

[0134] h1 may be the maximum dimension of the connection portion 332 in the first direction, and h2 may be the maximum dimension of the opening structure 231 in the first direction. For example, when the opening structure 231 is a groove, h2 is the maximum depth of the groove.

[0135] When h1≥0.5h2, the connecting portion 232 has a relatively suitable size in the first direction, so that it can support and strengthen the opening structure 231; when h1≤h2, in the first direction, the connecting portion 232 will not exceed the opening structure 231, which can reduce the risk of interference between the connecting portion 232 and other components in the battery cell.

[0136] In this embodiment, 0.5h2≤h1≤h2, the connection portion 232 can not only provide strong support and structural reinforcement for the opening structure 231, but also reduce the risk of interference between the connection portion 232 and other components in the battery cell.

[0137] As an example, along the first direction, the size h1 of the connection portion 232 is the same as the size h2 of the opening structure 231 .

[0138] In some embodiments, the thickness t of the connecting portion 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.

[0139] The thickness t of the connecting portion 232 is the average thickness of the connecting portion 232, that is, the average of the maximum thickness and the minimum thickness. For a well-made connecting portion 232, the thickness of the connecting portion 232 is uniform, and the connecting portion 232 has the same or substantially the same thickness at different positions along the extending direction of the connecting portion 232.

[0140] When t≥0.4mm, the connecting portion 232 has a suitable thickness, so that it can better support and strengthen the opening structure 231; when t≤2mm, it is convenient to prepare the connecting portion 232, and the risk of uneven surface of the connecting portion 232 and uneven thickness at different positions of the connecting portion 232 can be reduced.

[0141] In this embodiment, 0.4 mm ≤ t ≤ 2 mm. Thus, the connection portion 232 can provide strong support and structural reinforcement for the opening structure 231 , and facilitate the preparation of the connection portion 232 with uniform thickness and smooth surface.

[0142] Figure 8 is an enlarged schematic diagram of region E of the isolation member in Figure 6. In some embodiments, as shown in Figures 6 to 8 , along the second direction, the distance L between the through hole 237 and the side plate 230 satisfies: 0 mm ≤ L ≤ 1 mm. The second direction is the width direction of the isolation plate 233.

[0143] As an example, in combination with FIG5 and FIG6 , when a plurality of through holes 237 are arranged along the first direction, the distance L is the minimum distance between the edge of the through hole 237 and the long side wall 2301 along the second direction.

[0144] L can be 0 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm or any value within the above range.

[0145] When L is less than or equal to 1 mm, it is more conducive for the electrolyte to flow out through the through hole 237. When L is greater than or equal to 0 mm, a suitable distance is maintained between the through hole 237 and the side plate 230, which facilitates the preparation of the through hole 237. By setting 0 mm less than or equal to L less than 1 mm, the preparation of the through hole 237 is facilitated and the electrolyte is more conducive to flow out through the through hole 237.

[0146] In some embodiments, the area S of the through hole 237 satisfies: 0.19 mm 2 ≤ S ≤ 20 mm 2 , for example, 0.19 mm 2 , 1.6 mm 2 , 10 mm 2 , 20 mm 2 or any value within the above range.

[0147] The area S of the through hole 237 refers to the area of ​​one through hole 237 .

[0148] When S is less than or equal to 20 mm², the cross-sectional area of ​​the through-hole 237 is not too large, thereby providing the isolation member 23 with a high structural strength. When S is greater than or equal to 0.19 mm², the cross-sectional area of ​​the through-hole 237 is not too small, thereby facilitating the outflow of the electrolyte through the through-hole 237 and accelerating the outflow of the electrolyte from the isolation member 23. Therefore, the above arrangement can facilitate the outflow of the electrolyte from the isolation member 23 while ensuring the structural strength of the isolation member 23.

[0149] In some embodiments, the through hole 237 is circular in shape, which facilitates the preparation of the through hole 237 and helps to simplify the preparation complexity of the isolation member 23 .

[0150] The shape of the through hole 237 can also be rectangular, elliptical or irregular, and the embodiments of the present application include but are not limited to these.

[0151] In some embodiments, the diameter D of the through hole 237 satisfies: 0.5 mm ≤ D ≤ 5 mm.

[0152] D may refer to the diameter of the through hole 237 when the through hole 237 is a circular through hole.

[0153] D can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or any value within the above range.

[0154] When D is less than or equal to 5 mm, the size of the through hole 237 is not too large, thereby providing the isolation member 23 with a high structural strength. When D is greater than or equal to 0.5 mm, the size of the through hole 237 is not too small, thereby facilitating the outflow of the electrolyte through the through hole 237. Therefore, by setting 0.5 mm less than or equal to D less than or equal to 5 mm, the structural strength of the isolation member 23 can be ensured while facilitating the outflow of the electrolyte from the isolation member 23.

[0155] 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.

[0156] The first sub-isolating plate 233 a and the second sub-isolating plate 233 b are disposed opposite to each other along a second direction, which is a width direction of the isolation member 23 , such as the y direction in FIG. 5 .

[0157] 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 .

[0158] FIG9 is a schematic structural diagram of a first end cap assembly according to an embodiment of the present application. In an embodiment of the present application, as shown in FIG3 , FIG4 and FIG9 , the housing 20 includes a shell 21 and a first end cap assembly 24 , which is used to cover an opening at one end of the shell 21 .

[0159] The shell 21 may be a hollow structure with an opening at one end, and the first end cover assembly 24 covers the opening of the shell 21 .

[0160] The first end cover assembly 24 is provided with a protruding structure 241 , which is engaged with the opening structure 231 .

[0161] The protruding structure 241 is provided at the end region of the first end cap assembly 24 along the first direction, and the protruding structure 241 is provided corresponding to the opening structure 231 so as to be engaged with the opening structure 231. The protruding structure 241 is a structure protruding toward the electrode assembly 22.

[0162] In this embodiment, the opening structure 231 of the isolation member 23 engages with the protruding structure 241 of the first end cap assembly 24 to facilitate the fixation between the isolation member 23 and the first end cap assembly 24, thereby reducing the risk of the tab 222 being torn due to movement of the isolation member 23. Furthermore, the provision of the through-hole 237 reduces the risk of electrolyte accumulation in the isolation member 23, thereby facilitating full utilization of the electrolyte and improving the performance of the battery cell 2.

[0163] In some embodiments, the housing 20 further includes a second end cover assembly 25 , which is used to cover an opening at the other end of the shell 21 .

[0164] The shell 21 may be a hollow structure with openings at both ends, and the first end cover assembly 24 and the second end cover assembly 25 respectively cover the openings at both ends of the shell 21 .

[0165] 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.

[0166] 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 .

[0167] Figure 10 is a schematic structural diagram of region B of the battery cell in Figure 3, and Figure 11 is an enlarged schematic diagram of region C in Figure 10. As shown in Figures 10 and 11, the opening structure 231 and the protruding structure 241 are engaged with each other.

[0168] As an example, 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 fixing of the protruding structure 241 and the opening structure 231 in a first direction; the snap portion 2413 snaps into the slot portion 2313 to facilitate the fixing of the protruding structure 241 and the opening structure 231 in a third direction; 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.

[0169] As an example, along the thickness direction of the wall (such as the z direction in Figure 11), 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.

[0170] In some embodiments, as shown in FIG10 , the first end cap assembly 24 further includes an insulating member 244 and an end cap 243. The end cap 243 is used to cover the opening at one end of the housing 21. The insulating member 244 is provided with a protruding structure 241. The end cap 243 is a wall portion of the housing 20.

[0171] 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.

[0172] 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 .

[0173] The end cap 243 may be made of metal and be conductive, and the insulating member 244 may be made of plastic.

[0174] 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 outer shell 20 . This isolates the electrode assembly 22 from the outer shell 20 , reducing the risk of short circuits caused by contact between the electrode assembly 22 and the outer shell 20 . 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 .

[0175] As an example, the insulating film 26 is an insulating thermoplastic isolation film, such as a Mylar film.

[0176] 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 20. 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.

[0177] An embodiment of the present application provides a battery, comprising the battery cell 2 described in any one of the above embodiments.

[0178] The present embodiment provides a battery cell 2, which includes a first end cap assembly 24, an isolation member 23, an electrode assembly 22, and a housing 21. The housing 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 housing 21. 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 is provided with a channel 2330, through which the tab 222 is electrically connected to the first electrode lead-out member 242. The isolation member 23 includes an isolation plate 233 and a side plate 230. 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. The side plate 230 and the isolation plate 233 together define a receiving recess. 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, the minimum distance between the end of the inclined surface 2331a closest 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. Furthermore, the isolation member 23 includes an opening structure 231 and a connecting portion 232. The outer wall 2311 of the opening structure 231, the connecting portion 232, the side plate 230, and the isolation plate 233 collectively form a first recessed space 2351. At least one through hole 237 is provided on each of the connecting plate 2332 and the isolating plate 233 in the region corresponding to the first recessed space 2351. With the above arrangement, the battery cell 2 has a higher reliability and the battery cell 2 makes more effective use of the electrolyte.

[0179] 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 (20) comprising a wall portion, wherein the wall portion is provided with a first electrode lead-out member (242); An electrode assembly (22) is accommodated in the housing (20), 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) comprising an isolation plate (233), the isolation plate (233) being provided with a channel (2330), the electrode tab (222) passing through the channel (2330) and being electrically connected to the first electrode lead-out member (242); The isolation plate (233) is provided with at least one through hole (237), and the through hole (237) penetrates the isolation plate (233) along the thickness direction of the isolation plate (233).

2. The battery cell according to claim 1, characterized in that: The isolation member (23) further comprises a side plate (230), the side plate (230) surrounding the outer side of the isolation plate (233), the side plate (230) protruding from a side of the isolation plate (233) away from the main body (221), so as to define a receiving recess (2350) together with the isolation plate (233); At least a portion of the pole lug (222) is accommodated in the accommodation recess (2350).

3. The battery cell according to claim 2, characterized in that: The through hole (237) is arranged at a position of the isolation plate (233) close to the side plate (230).

4. The battery cell according to claim 2 or 3, 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, 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); At least one through hole (237) is provided on the connecting plate (2332).

5. The battery cell according to any one of claims 2 to 4, characterized in that: The isolation member (23) further comprises: An opening structure (231), wherein the opening structure (231) is arranged at the isolation plate (233) along the first direction An end region of the isolation plate (233) extends from a surface of the isolation plate (233) that is away from the main body (221) toward a direction close to the wall portion, wherein the first direction is a length direction of the isolation plate (233); a connecting portion (232), the connecting portion (232) being connected to an outer side wall (2311) of the opening structure (231) and extending to the side plate (230) in a direction away from the opening structure (231); The outer side wall (2311), the connecting portion (232), the side plate (230) and the isolation plate (233) enclose a first recessed space (2351), and at least one through hole (237) is provided on an area of ​​the isolation plate (233) opposite to the first recessed space (2351).

6. The battery cell according to claim 5, characterized in that: The extending direction of the connecting portion (232) passes through the center of the opening structure (231).

7. The battery cell according to claim 5 or 6, 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 the second direction, and the two short side walls (2302) are respectively located on both sides of the isolation plate (233) along the first direction, and the second direction is the width direction of the isolation plate (233); The ends of the two connecting portions (232) close to the opening structure (231) are respectively connected to the outer side walls (2311) of the opening structure (231), and the ends of the two connecting portions (232) away from the opening structure (231) are respectively connected to the two long side walls (2301), and the two connecting portions (232), the two long side walls (2301), one of the two short side walls (2302) and the isolation plate (233) enclose two first recessed spaces (2351).

8. The battery cell according to claim 7, characterized in that: The two connecting portions (232) are symmetrically arranged along the first direction.

9. The battery cell according to any one of claims 5 to 8, characterized in that: Along the thickness direction of the isolation plate (233), the dimension h1 of the connection portion (232) and the dimension h2 of the opening structure (231) satisfy: 0.5h2≤h1≤h2.

10. The battery cell according to any one of claims 5 to 9, characterized in that: The thickness t of the connecting portion (232) satisfies: 0.4 mm ≤ t ≤ 2 mm.

11. The battery cell according to any one of claims 2 to 10, characterized in that: Along the second direction, a distance L between the through hole (237) and the side plate (230) satisfies: 0 mm ≤ L ≤ 1 mm, and the second direction is the width direction of the isolation plate (233).

12. The battery cell according to any one of claims 1 to 11, characterized in that: The through hole (237) is circular in shape.

13. The battery cell according to claim 12, characterized in that: The diameter D of the through hole (237) satisfies: 0.5 mm≤D≤5 mm.

14. The battery cell according to any one of claims 1 to 13, 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).

15. The battery cell according to any one of claims 5 to 14, characterized in that: The housing (20) comprises a shell (21) and a first end cover assembly (24), wherein the first end cover assembly (24) is used to cover an opening at one end of the shell (21), the first end cover assembly (24) is provided with a protruding structure (241), and the opening structure (231) is snap-fitted with the protruding structure (241).

16. The battery cell according to claim 15, 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 an opening at one end of the shell (21); the insulating member (244) is provided with the protruding structure (241); and the end cover (243) is the wall portion.

17. The battery cell according to claim 15 or 16, characterized in that: The housing (20) further comprises a second end cover assembly (25), wherein the second end cover assembly (25) is used to cover an opening at the other end 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: An insulating film (26) is sleeved on the outer surface of the electrode assembly (22) and arranged on the inner side of the outer shell (20).

19. The battery cell according to any one of claims 1 to 18, characterized in that: The battery cell further comprises: A side support plate (27) is disposed between the electrode assembly (22) and the inner side of the housing (20).

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

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

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