Battery cell, battery, and electrical device

Abstract

Provided in the embodiments of the present application are a battery cell, a battery, and an electrical device. The battery cell comprises a housing, an electrode assembly, and an insulator. The electrode assembly is accommodated in the housing; the electrode assembly is formed by winding and / or stacking electrode sheets, and the electrode assembly has a first end face; and at least a portion of the insulator is arranged between the first end face and the housing; wherein at least one first through hole is formed on the part of the insulator opposite the first end face, the first through hole is a slot-shaped hole, and the length direction of each first through hole is parallel or at an angle with the stacking direction of the electrode sheet exposed by said first through hole. According to the technical solution of the present application, battery yield can be improved and production costs can be reduced.

Description

Battery cells, batteries and electrical equipment 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] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] During the battery manufacturing process, the battery yield rate is an issue that cannot be ignored. Therefore, how to improve the battery yield rate is a technical problem that needs to be solved urgently in battery technology.

[0004] Summary of the Invention

[0005] The present application provides a battery cell, a battery, and an electrical device, which can improve the yield rate of the battery and reduce production costs.

[0006] This application is achieved through the following technical solutions:

[0007] In a first aspect, embodiments of the present application provide a battery cell comprising a housing, an electrode assembly, and an insulating member. The electrode assembly is housed within the housing and is formed by winding and / or stacking electrode sheets. The electrode assembly has a first end face. At least a portion of the insulating member is disposed between the first end face and the housing. The insulating member has at least one first through hole disposed on a portion opposite the first end face. The first through hole is a strip-shaped hole, and the length direction of each first through hole is parallel to or inclined with respect to the stacking direction of the electrode sheets exposed by the first through hole.

[0008] According to the battery cell of the embodiment of the present application, at least one first through hole is provided on the insulating member, and the first through hole is a long strip hole. The first through hole can expose the stacked multi-layer electrode sheets, so that the electrolyte can pass through the insulating member through the first through hole to infiltrate the electrode assembly wrapped by the insulating member, thereby improving the efficiency of the electrolyte infiltrating the electrode assembly, improving the infiltration interface, improving the yield of the battery cell, and reducing the production cost.

[0009] According to some embodiments of the present application, there are multiple first through holes, and the multiple first through holes are arranged at intervals.

[0010] In the above solution, the plurality of first through holes are arranged at intervals, which can expose more electrode assemblies, thereby increasing the infiltration area of ​​the electrolyte and the electrode assembly and improving the efficiency of the electrolyte infiltrating the electrode assembly.

[0011] According to some embodiments of the present application, a plurality of first through holes are arranged at intervals along the extension direction of the pole piece.

[0012] In the above scheme, the electrode assembly has a larger area in the extension direction of the electrode piece, and multiple first through holes are distributed at different positions in the extension direction of the electrode piece, so that the electrolyte contacts and infiltrates the electrode assembly at different positions in the extension direction of the electrode piece, thereby improving the wetting effect and efficiency of the electrolyte.

[0013] According to some embodiments of the present application, the first end face is arranged facing the bottom wall of the shell, and the battery cell also includes an isolating member, which is arranged in the shell and located between the insulating member and the bottom wall; the isolating member is provided with a second through hole, which is a strip hole, and the length direction of the second through hole is parallel to the length direction of the first through hole.

[0014] In the above embodiment, the separator is disposed within the housing and between the insulating member and the bottom wall of the housing. The separator improves insulation between the electrode assembly and the housing. The second through-hole is also a strip-shaped hole, and its length is parallel to that of the first through-hole, allowing more electrolyte to flow through the separator to the first through-hole, thereby soaking the electrode assembly.

[0015] According to some embodiments of the present application, along the thickness direction of the bottom wall, the second through hole does not overlap with the first through hole.

[0016] In the above scheme, the second through hole of the isolation member does not overlap with the first through hole along the thickness direction of the bottom wall, which can reduce the probability of the detached active material layer contacting the outer shell; at the same time, the electrolyte can also flow from the second through hole through the gap between the isolation member and the insulating member to the first through hole, so as to pass through the insulating member and infiltrate the electrode assembly.

[0017] According to some embodiments of the present application, the number of the second through holes is greater than the number of the first through holes.

[0018] In the above solution, the number of second through holes is greater than the number of first through holes. On the one hand, more electrolyte can flow through the isolation member to the first through holes. On the other hand, the number of first through holes in the insulation member is smaller, and the insulation member can have higher strength.

[0019] According to some embodiments of the present application, there are multiple second through holes, and there are multiple first through holes. Along the extension direction of the pole piece, the multiple first through holes and the multiple second through holes are arranged at intervals.

[0020] In the above scheme, the number of second through holes and the number of first through holes are both multiple, and the multiple first through holes and the multiple second through holes are spaced apart so that more electrolyte can pass through the insulating part to infiltrate the electrode assembly, thereby improving the wetting effect and efficiency of the electrolyte on the electrode assembly.

[0021] According to some embodiments of the present application, the isolation member and the insulating member are connected to form multiple connection parts, and at least one first through hole and at least one second through hole are provided between two adjacent connection parts along a first direction, and the first direction intersects with the thickness direction of the electrode assembly.

[0022] In the above scheme, the isolating member and the insulating member are connected to form multiple connecting parts, so that the isolating member and the insulating member are firmly connected; at least one first through hole and at least one second through hole are provided between two adjacent connecting parts to reduce the obstruction of the connecting parts to the electrolyte between the isolating member and the insulating member, thereby facilitating the electrolyte at this position to flow to the first through hole.

[0023] According to some embodiments of the present application, the isolation member has a first surface facing the insulating member, the first surface is provided with a first groove, and the first groove communicates with the adjacent first through hole and the second through hole.

[0024] In the above solution, the first groove communicates with the first through hole and the second through hole, so that the electrolyte between the separator and the insulating member can quickly enter the first through hole, thereby improving the efficiency of the electrolyte infiltrating the electrode assembly.

[0025] According to some embodiments of the present application, along the first direction, the size of the battery cell is L1, the distance between adjacent first through holes and second through holes is L2, satisfying 0<L2≤0.5L1, and the first direction intersects with the thickness direction of the electrode assembly.

[0026] In the above solution, the distance between adjacent first through holes and second through holes satisfies the above relationship (0<L2≤0.5L1). On the one hand, it can reduce the risk of the detached active material layer contacting the shell, and on the other hand, it facilitates the rapid flow of the electrolyte to the first through holes.

[0027] According to some embodiments of the present application, 1 mm ≤ L2 ≤ 20 mm.

[0028] In the above solution, compared with L2 < 1 mm, when L2 ≥ 1 mm, the risk of the detached active material layer contacting the shell can be effectively reduced; compared with L2 > 20 mm, when L2 ≤ 20 mm, the electrolyte can flow quickly to the first through hole.

[0029] According to some embodiments of the present application, the insulating member is provided with a first positioning hole, which passes through the insulating member along the thickness direction of the bottom wall, and the insulating member is provided with a second positioning hole corresponding to the first positioning hole, which passes through the insulating member along the thickness direction of the bottom wall.

[0030] In the above solution, the first positioning hole passes through the isolating member along the thickness direction of the bottom wall, and the second positioning hole passes through the insulating member along the thickness direction of the bottom wall, so as to facilitate positioning of the isolating member and the insulating member in the thickness direction of the bottom wall.

[0031] According to some embodiments of the present application, there are multiple first positioning holes, and there are multiple second positioning holes, and each first positioning hole is corresponding to one second positioning hole.

[0032] In the above solution, each first positioning hole is provided in correspondence with a second positioning hole, enabling positioning of the separator and the insulating member at multiple locations, thereby improving the positioning of the separator and the insulating member. After the separator and the insulating member are assembled, at least one of the first positioning hole and the second positioning hole is blocked to reduce the risk of contact between the detached active material layer and the outer shell.

[0033] According to some embodiments of the present application, the plurality of second positioning holes are respectively provided at both ends of the insulating member along a first direction, and the first direction intersects with a thickness direction of the electrode assembly.

[0034] In the above solution, the plurality of first positioning holes are respectively provided at both ends of the insulating member along the first direction, so as to improve the positioning effect of the isolation member and the insulating member.

[0035] According to some embodiments of the present application, along the thickness direction of the electrode assembly, the size of the electrode assembly is W1, and the size of the first through hole is W2, satisfying 0.1W1≤W2≤W1.

[0036] In the above scheme, the dimension of the electrode assembly along the thickness direction of the electrode assembly and the dimension of the first through hole along the thickness direction of the electrode assembly satisfy the above relationship (0.1W1≤W2≤W1). On the one hand, the first through hole can expose more layers of electrode sheets to improve the effect of electrolyte infiltration of the electrode assembly. On the other hand, the insulating part can also have higher strength.

[0037] According to some embodiments of the present application, 0.2W1≤W2≤0.7W1.

[0038] In the above solution, compared with W2<0.2W1, when W2≥0.2W1, the first through hole can pass more electrolyte; compared with W2>0.7W1, when W2≤0.7W1, the insulating member has higher strength.

[0039] According to some embodiments of the present application, along the first direction, the size of the first through hole is H1, satisfying 0.5 mm ≤ H1 ≤ 10 mm, and the first direction intersects with the thickness direction of the electrode assembly.

[0040] In the above scheme, the size of the first through hole along the first direction satisfies the above relationship (0.5mm≤H1≤10mm). On the one hand, it is convenient for processing and manufacturing. On the other hand, it can facilitate more electrolyte to infiltrate the electrode assembly through the first through hole, and the insulating part has higher strength.

[0041] According to some embodiments of the present application, 1 mm ≤ H1 ≤ 5 mm.

[0042] In the above scheme, compared with H1<1mm, when H1≥1mm, the processing difficulty is lower, which facilitates the electrolyte to infiltrate the electrode assembly; compared with H1>5mm, when H1≤5mm, the insulating part has higher strength.

[0043] According to some embodiments of the present application, the electrode assembly is a wound structure, and the electrode assembly includes a straight area and a corner area. The corner area is arranged at both ends of the straight area in the length direction, and the first through hole is arranged opposite to the straight area and / or the corner area.

[0044] In the above solution, when the electrode assembly has a wound structure, first through-holes are provided at positions corresponding to the insulating member and the straight region, allowing the first through-holes to expose more electrode sheets and improve the efficiency of electrolyte wetting the electrode assembly. First through-holes are provided at positions corresponding to the insulating member and the corner region to improve the efficiency of electrolyte wetting the electrode assembly in the corner region.

[0045] According to some embodiments of the present application, the electrode assembly is a flat structure.

[0046] In the above scheme, the electrode assembly is a flat structure, and multiple pole pieces are stacked in the thickness direction of the electrode assembly. The length direction of the first through hole is parallel to or intersects with the thickness direction of the electrode assembly, so that the electrolyte passing through the first through hole can infiltrate more electrode assemblies, thereby improving the efficiency of the electrolyte infiltrating the electrode assembly.

[0047] In a second aspect, an embodiment of the present application further provides a battery, which includes a battery cell provided in any of the above embodiments.

[0048] In a third aspect, an embodiment of the present application provides an electrical device, which includes a battery cell or a battery as provided in any of the above embodiments, and the battery cell or the battery is used to provide electrical energy.

[0049] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] 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. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0051] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0052] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0053] FIG3 is an exploded view of a battery cell provided in some embodiments of the present application;

[0054] FIG4 is a schematic structural diagram of an insulating member provided in some embodiments of the present application;

[0055] FIG5 is a schematic diagram of the assembly of an insulating member and an electrode assembly according to some embodiments of the present application;

[0056] FIG6 is a schematic structural diagram of a C-shaped first through hole provided in some embodiments of the present application;

[0057] FIG7 is a schematic structural diagram of an S-shaped first through hole provided in some embodiments of the present application;

[0058] FIG8 is an exploded view of a battery cell provided in some other embodiments of the present application;

[0059] FIG9 is a cross-sectional view of a battery cell provided in some embodiments of the present application;

[0060] FIG10 is a schematic diagram of assembling a spacer and a bottom insulating portion according to some embodiments of the present application;

[0061] FIG11 is a cross-sectional view of an assembled spacer and a bottom insulating portion according to some embodiments of the present application;

[0062] FIG12 is a schematic structural diagram of a bottom insulating portion and an electrode assembly provided in some embodiments of the present application;

[0063] FIG13 is a schematic diagram of the assembly of the insulating member and the electrode assembly provided in some embodiments of the present application.

[0064] In the drawings, the drawings are not drawn to scale.

[0065] Marking instructions: 100-battery; 10-box; 11-first sub-box; 12-second sub-box; 20-battery cell; 21-housing; 211-shell; 2111-side wall; 2112-bottom wall; 212-end cover; 22-electrode assembly; 22a-first end face; 221-main body; 222-ear; 223-electrode piece; 223a-positive electrode piece; 223b-negative electrode piece; 224-straight area; 225-corner area; 23-electrode terminal; 24- Insulating member; 240-accommodating cavity; 241-side insulating portion; 242-bottom insulating portion; 2421-first through hole; 2422-second positioning hole; 25-isolating member; 251-second through hole; 252-connecting portion; 252a-first connecting portion; 252b-second connecting portion; 252c-third connecting portion; 253-first surface; 254-first groove; 255-first positioning hole; 26-adapter; 200-controller; 300-motor; 1000-vehicle. DETAILED DESCRIPTION

[0066] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0068] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0070] 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.

[0071] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0072] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0073] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0074] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0075] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0076] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0077] The battery cells may be, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0078] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0079] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0080] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0081] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0082] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0083] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0084] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium.

[0085] In some embodiments, the negative electrode current collector has two opposite surfaces in its thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0086] As an example, the negative electrode active material may be a negative electrode active material for a battery that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0087] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0088] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0089] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0090] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0091] In some embodiments, the electrode assembly is a laminate structure.

[0092] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0093] In some embodiments, the housing includes an end cap and a shell. The shell has an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly, electrolyte, and other substances. The shell may have one or more openings. One or more end caps may also be provided.

[0094] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to a tab of the electrode assembly. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal may be provided on an end cap or on the housing.

[0095] In some embodiments, the housing is provided with an explosion-proof valve for releasing the internal pressure of the battery cell.

[0096] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include square-shell, blade-shaped, and polygonal batteries. Polygonal batteries may be, for example, hexagonal batteries.

[0097] The development of battery technology must take into account multiple design factors at the same time, such as performance parameters such as energy density, discharge capacity, charge and discharge rate, and also the battery yield.

[0098] In some embodiments, a battery cell includes a housing, an electrode assembly, and an insulating member. The electrode assembly and the insulating member are disposed within the housing, and the insulating member encapsulates the electrode assembly. When electrolyte is injected into the housing, the electrode assembly remains soaked in the electrolyte for a prolonged period of time, and some electrolyte is located between the insulating member and the housing. For example, electrolyte easily accumulates between the insulating member and the housing, making it difficult for the electrolyte to penetrate the insulating member. This results in difficulty soaking the electrode assembly with the electrolyte, a prolonged soaking period, and a poor wetting interface of the electrode assembly, resulting in lower battery cell performance, lower battery cell yield, and higher battery cell manufacturing costs.

[0099] In view of this, an embodiment of the present application provides a technical solution, in which a battery cell includes an electrode assembly and an insulating member, the electrode assembly has a first end face, at least part of the insulating member is arranged between the first end face and the outer shell, and at least one first through hole is provided on the part of the insulating member opposite to the first end face. The first through hole is a strip-shaped hole, and the first through hole exposes the stacked multi-layer pole pieces so that the electrolyte can pass through the insulating member to infiltrate the electrode assembly, thereby improving the efficiency of the electrolyte infiltrating the electrode assembly, improving the yield of the battery cell, and reducing the manufacturing cost of the battery cell.

[0100] When manufacturing the above-mentioned battery cell, since the first through hole is a long strip hole, the length direction of the first through hole is parallel to or inclined with the stacking direction of the electrode sheets, so that the first through hole can expose the stacked multi-layer electrode sheets. After the electrolyte passes through the insulating part through the first through hole, it can infiltrate more layers of electrode sheets, so that the electrolyte can infiltrate more areas of the electrode assembly, thereby improving the efficiency of the electrolyte infiltrating the electrode assembly, and the infiltration interface is good, which can improve the yield rate of the battery cell and the manufacturing cost of the battery cell is relatively low.

[0101] The battery disclosed in the embodiments of the present application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. The battery disclosed in the present application can be used to form a power supply system for the electrical equipment.

[0102] The embodiments of the present application provide an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0103] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0104] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, such as for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0105] The vehicle 1000 may further include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0106] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0107] Please refer to Figure 2, which is an exploded view of a battery provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 being housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 can include a first sub-housing 11 and a second sub-housing 12, which cover each other and together define a storage space for accommodating the battery cell 20. The second sub-housing 12 can be a hollow structure with one end open, and the first sub-housing 11 can be a plate-like structure, with the first sub-housing 11 covering the open side of the second sub-housing 12, so that the first sub-housing 11 and the second sub-housing 12 jointly define a storage space; the first sub-housing 11 and the second sub-housing 12 can also be hollow structures with one end open, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0108] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0109] The battery cell 20 may be a secondary battery or a primary battery; the battery cell 20 may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0110] Please refer to Figure 3, which is an exploded view of a battery cell provided in some embodiments of the present application. As shown in Figure 3, a battery cell 20 includes a housing 21, an electrode assembly 22, and electrode terminals 23. Housing 21 includes a shell 211 and an end cap 212. Shell 211 has an opening, and end cap 212 closes the opening, isolating the internal environment of battery cell 20 from the external environment.

[0111] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. The housing 211 can be of various shapes and sizes. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 22. The housing 211 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0112] The end cap 212 is a component that covers the opening of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 212 can be adapted to the shape of the housing 211 to fit the housing 211. Optionally, the end cap 212 can be made of a material with a certain hardness and strength (such as an aluminum alloy). This prevents the end cap 212 from deforming when subjected to compression or collision, thereby providing the battery cell 20 with greater structural strength and improved reliability. Functional components such as electrode terminals can be provided on the end cap 212. The electrode terminals can be used to electrically connect to the electrode assembly 22 to output or input electrical energy to the battery cell 20. The end cap 212 can also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this is not particularly limited in the present embodiment. In some embodiments, an insulating structure can be provided on the inner side of the end cap 212 to isolate the electrical connection components within the housing 211 from the end cap 212 to reduce the risk of short circuits. For example, the insulating structure may be plastic, rubber, or the like.

[0113] The electrode assembly 22 is the component where the electrochemical reaction occurs in the battery cell 20. One or more electrode assemblies 22 may be contained in the housing 211. The electrode assembly 22 is mainly formed by winding and / or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The separator is used to separate the positive electrode sheet and the negative electrode sheet to prevent internal short circuits between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body 221 of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tab 222. The positive electrode tab and the negative electrode tab can be located together at one end of the main body 221 or respectively at both ends of the main body 221. During the charge and discharge process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 222 is connected to the electrode terminal 23 through the adapter 26 to form a current loop.

[0114] Please refer to Figure 3 and further to Figures 4 and 5. Figure 4 is a schematic diagram of the structure of an insulating member provided in some embodiments of the present application, and Figure 5 is a schematic diagram of the assembly of the insulating member and the electrode assembly provided in some embodiments of the present application. In Figure 5, multiple layers of electrode sheets are exposed through first through-holes. According to some embodiments of the present application, a battery cell 20 is provided. The battery cell 20 includes a housing 21, an electrode assembly 22, and an insulating member 24. The electrode assembly 22 is housed within the housing 21. The electrode assembly 22 is formed by winding and / or stacking electrode sheets. The electrode assembly has a first end surface. At least a portion of the insulating member 24 is disposed between the first end surface 22a and the housing 21. The portion of the insulating member 24 opposite the first end surface 22a is provided with at least one first through-hole 2421. The first through-hole 2421 is a strip-shaped hole. The length direction Y of each first through-hole 2421 is parallel to or inclined with the stacking direction of the electrode sheets 223 exposed by the first through-hole 2421.

[0115] In the figure, the direction indicated by the letter Y may be parallel to the length direction of the first through hole 2421 .

[0116] The electrode assembly 22 may be a stacked structure or a wound structure, or may have a stacked structure in part and a wound structure in part. For example, the inner part may be a stacked structure and the outer part may be a wound structure, with the wound structure wound around the outer part of the stacked structure.

[0117] The periphery of the electrode assembly 22 is disposed around the bottom of the electrode assembly 22. The electrode assembly 22 includes a main body 221 and a tab 222. The tab 222 extends from an end surface of the main body 221. The periphery of the electrode assembly 22 refers to the outer peripheral surface of the main body 221 disposed around the edge of the end surface. In some embodiments, the tab 222 may be located at the top of the electrode assembly 22.

[0118] The electrode assembly 22 may be formed by winding or stacking a positive electrode sheet 223 a and a negative electrode sheet 223 b , with a plurality of electrode sheets 223 stacked.

[0119] The insulating member 24 is a component that performs an insulating function and is used to insulate and isolate the electrode assembly 22 from the housing 21 .

[0120] The insulating member 24 may be an insulating film with a relatively small thickness to reduce space occupation. For example, the insulating member 24 may be a Mylar film.

[0121] The insulating member 24 includes a side insulating portion 241 and a bottom insulating portion 242 . The side insulating portion 241 wraps the outer periphery of the electrode assembly 22 , and the bottom insulating portion 242 is connected to the side insulating portion 241 and wraps the bottom of the electrode assembly 22 .

[0122] The first end surface 22a is an end surface of one end of the main body 221 of the electrode assembly 22. For example, the first end surface 22a may be an end surface of one end in the length direction of the electrode assembly 22, or the first end surface 22a may be an end surface of one end in the width direction of the electrode assembly 22. In some embodiments, the first end surface 22a may be opposite to the end surface of one end of the main body 221 extending from the tab 222, and the first end surface 22a may not be coplanar with the end surface of one end of the main body 221 extending from the tab 222.

[0123] The first through hole 2421 is arranged on the portion of the insulating member 24 opposite to the first end face 22a. For example, when the side insulating portion 241 is arranged opposite to the first end face 22a, the first through hole 2421 can be arranged on the side insulating portion 241; or, when the bottom insulating portion 242 is arranged opposite to the first end face 22a, as shown in Figure 4, the first through hole 2421 can be arranged on the bottom insulating portion 242.

[0124] The side insulating portion 241 may be cylindrical, with one end of the side insulating portion 241 being open. The other end of the side insulating portion 241 is connected to the bottom insulating portion 242 to form a receiving cavity 240, and the electrode assembly 22 is received in the receiving cavity 240. When electrolyte is injected into the housing 21, the electrolyte can enter the receiving cavity 240 through the opening of the side insulating portion 241 away from the bottom insulating portion 242, thereby facilitating electrolyte infiltration.

[0125] The bottom insulating portion 242 is located at the bottom of the electrode assembly 22. When electrolyte is injected into the outer shell 21, the electrolyte generally infiltrates from the top of the electrode assembly 22 toward the bottom of the electrode assembly 22. The electrolyte does not easily penetrate the insulating member 24, and the electrolyte infiltrates the electrode assembly 22 for a long time. Some electrolyte overflows between the insulating member 24 and the outer shell 21 and accumulates between the bottom insulating portion 242 and the outer shell 21. First through-holes 2421 are provided on the side insulating portions 241 and / or the bottom insulating portion 242. The electrolyte can enter the accommodating cavity 240 through the first through-holes 2421 and infiltrate the electrode assembly 22.

[0126] The first through hole 2421 may penetrate the insulating member 24 along a thickness direction of the insulating member 24 so that the interior of the accommodating cavity 240 communicates with the outside.

[0127] Please refer to Figure 5, and further refer to Figures 6 and 7. Figure 6 is a schematic diagram of the structure of a C-shaped first through hole provided in some embodiments of the present application, and Figure 7 is a schematic diagram of the structure of an S-shaped first through hole provided in some embodiments of the present application. The first through hole 2421 is a bar-shaped hole, and the extension trajectory of the first through hole 2421 can be a straight line or a curve, for example, C-shaped, S-shaped or irregular. The extension trajectory here means that the first through hole 2421 forms a bar structure from the starting point to the end point along the extension trajectory. Optionally, the extension trajectory of the first through hole 2421 is a straight line, and the first through hole 2421 is a linear bar hole.

[0128] The first through hole 2421 can expose the stacked multi-layer pole piece 223. The length direction Y of the first through hole 2421 can be parallel to the stacking direction of the pole piece 223, or can be inclined to the stacking direction of the pole piece 223, so that in the stacking direction of the pole piece 223, the first through hole 2421 exposes the multi-layer pole piece 223.

[0129] When manufacturing the above-mentioned battery cell 20, since the first through hole 2421 is a long strip hole, the length direction Y of the first through hole 2421 is parallel to or inclined with the stacking direction of the electrode pieces 223, so that the first through hole 2421 can expose the stacked multi-layer electrode pieces 223. After the electrolyte passes through the insulating part 24 through the first through hole 2421, it can infiltrate more layers of electrode pieces 223, so that the electrolyte can infiltrate more areas of the electrode assembly 22, shortening the time for the electrolyte to infiltrate the electrode assembly 22, improving the efficiency of the electrolyte infiltrating the electrode assembly 22, and having a good infiltration interface, which can improve the yield rate of the battery cell 20 and the manufacturing cost of the battery cell 20 is relatively low.

[0130] 4 and 5 , according to some embodiments of the present application, there are multiple first through holes 2421 , and the multiple first through holes 2421 are arranged at intervals.

[0131] The plurality of first through holes 2421 are arranged at intervals, so that the plurality of first through holes 2421 occupy a larger area, and the electrolyte can enter the accommodating cavity 240 at multiple positions of the insulating member 24 , thereby improving the efficiency of the electrolyte passing through the bottom insulating portion 242 .

[0132] In the above solution, the plurality of first through holes 2421 are arranged at intervals, which can expose more electrode assemblies 22 , thereby increasing the infiltration area of ​​the electrolyte and the electrode assembly 22 and improving the efficiency of the electrolyte infiltrating the electrode assembly 22 .

[0133] Referring to FIG. 5 , according to some embodiments of the present application, a plurality of first through holes 2421 are arranged at intervals along the extension direction X of the pole piece.

[0134] In the figure, the direction indicated by the X direction can be the extension direction of the pole piece. In the embodiment where the first through hole 2421 is provided on the bottom insulating portion 242, the extension direction X of the pole piece can be parallel to the length direction of the bottom insulating portion 242. In the embodiment where the first through hole 2421 is provided on the side insulating portion 241, the extension direction X of the pole piece can be parallel to the length direction of the side insulating portion 241.

[0135] In some embodiments, the extension direction X of the electrode sheet intersects the stacking direction of the electrode sheet. When the electrode assembly 22 is a wound structure, the extension direction of the electrode sheet can be the winding direction of the electrode sheet; when the electrode assembly 22 is a laminated structure, the extension direction of the electrode sheet can be the length direction of the electrode sheet or the width direction of the electrode sheet.

[0136] In some embodiments, the bottom insulating portion 242 has a larger dimension in the length direction than in other directions, so that the bottom insulating portion 242 has a larger corresponding area with the electrode assembly 22 in the length direction.

[0137] In some embodiments, the bottom insulating portion 242 may be rectangular so as to be connected with the side insulating portion 241 to form a larger accommodating cavity 240 .

[0138] In the above scheme, the electrode assembly 22 occupies a larger area in the extension direction X of the electrode piece, and multiple first through holes 2421 are distributed at different positions in the extension direction X of the electrode piece, so that the electrolyte contacts and infiltrates the electrode assembly 22 at different positions in the extension direction X of the electrode piece, thereby improving the wetting effect and efficiency of the electrolyte.

[0139] Please refer to Figures 8 and 9. Figure 8 is an exploded view of a battery cell provided in some other embodiments of the present application, and Figure 9 is a cross-sectional view of a battery cell provided in some embodiments of the present application. For ease of description, Figure 9 only shows a portion of the structure of the battery cell. According to some embodiments of the present application, the first end surface 22a is disposed facing the bottom wall 2112 of the housing 21. The battery cell 20 further includes a spacer 25 disposed within the housing 21 and between the insulating member 24 and the bottom wall 2112. The spacer 25 is provided with a second through hole 251. The second through hole 251 is a strip-shaped hole, and the length direction of the second through hole 251 is parallel to the length direction Y of the first through hole 2421.

[0140] The housing 21 may include a shell 211 having an opening and an end cap 212 that closes the opening of the shell 211. The shell 211 may include a side wall 2111 and a bottom wall 2112. One end of the side wall 2111 is connected to the bottom wall 2112, and the other end forms an opening.

[0141] The bottom insulating portion 242 of the insulating member 24 can be disposed adjacent to the bottom wall 2112. A liquid injection hole can be provided in the end cap 212 or in the side wall 2111 to inject electrolyte into the interior of the housing 21. After the electrolyte is injected, the electrolyte can accumulate between the bottom insulating portion 242 and the bottom wall 2112.

[0142] The separator 25 is an electrical insulating component and is located between the bottom of the electrode assembly 22 and the bottom wall 2112 . In some embodiments, the separator 25 may also be referred to as a bottom support plate for supporting the electrode assembly 22 .

[0143] The second through hole 251 can penetrate the separator 25 along the thickness direction Z of the bottom wall 2112, so that the electrolyte passes through the separator 25 in the thickness direction Z of the bottom insulating portion 242 via the second through hole 251, thereby reducing the barrier effect of the separator 25 on the electrolyte. The thickness direction Z of the bottom wall 2112 can be parallel to the thickness direction of the separator 25, and the thickness direction Z of the bottom wall 2112 can also be parallel to the thickness direction of the bottom insulating portion 242.

[0144] The second through hole 251 is a strip-shaped hole. The extension path of the second through hole 251 can be a straight line or a curve, such as a C-shape, an S-shape, or a special shape. The extension path here means that the second through hole 251 extends from the starting point to the end point along the extension path to form a strip-shaped structure. Optionally, the extension path of the second through hole 251 is a straight line, and the second through hole 251 is a linear strip-shaped hole.

[0145] The extension path of the second through hole 251 may be the same as or different from the extension path of the first through hole 2421. Optionally, the extension path of the second through hole 251 is the same as the extension path of the first through hole 2421.

[0146] The length direction of the second through hole 251 is parallel to the length direction Y of the first through hole 2421. For example, the second through hole 251 and the first through hole 2421 are spaced apart in the extension direction X of the pole piece. Along the extension direction X of the pole piece, the second through hole 251 and the first through hole 2421 at least partially overlap.

[0147] In the above embodiment, the separator 25 is disposed within the housing 21 and located between the bottom insulating portion 242 and the bottom wall 2112 of the housing 21. The separator 25 can improve the insulation between the electrode assembly 22 and the housing 21. The second through-hole 251 is also a strip-shaped hole, and the length direction of the second through-hole 251 is parallel to the length direction Y of the first through-hole 2421, so that more electrolyte can flow through the separator 25 to the first through-hole 2421 to infiltrate the electrode assembly 22.

[0148] 10 is a schematic diagram illustrating the assembly of a spacer and a bottom insulating portion according to some embodiments of the present application. According to some embodiments of the present application, along the thickness direction Z of the bottom wall 2112 , the second through hole 251 and the first through hole 2421 do not overlap.

[0149] When viewed along the thickness direction Z of the bottom wall 2112 , the second through hole 251 and the first through hole 2421 are staggered so that the second through hole 251 and the first through hole 2421 do not overlap.

[0150] The second through hole 251 of the isolation member 25 does not overlap with the first through hole 2421 along the thickness direction Z of the bottom wall 2112, which can reduce the probability of the detached active material layer contacting the outer shell 21; at the same time, the electrolyte can also flow from the second through hole 251 through the gap between the isolation member 25 and the insulating member 24 to the first through hole 2421, so as to pass through the insulating member 24 and infiltrate the electrode assembly 22.

[0151] According to some embodiments of the present application, the number of the second through holes 251 is greater than the number of the first through holes 2421 .

[0152] The strength of the isolation member 25 may be greater than that of the insulating member 24 , and the number of the second through holes 251 is greater than the number of the first through holes 2421 , so that the isolation member 25 still has greater strength.

[0153] The number of the second through holes 251 is greater than the number of the first through holes 2421. On the one hand, more electrolyte can pass through the isolation member 25 and flow to the first through holes 2421. On the other hand, the number of the first through holes 2421 of the insulating member 24 is smaller, which has less impact on the strength of the insulating member 24, and the insulating member 24 can have higher strength.

[0154] According to some embodiments of the present application, there are multiple second through holes 251 and multiple first through holes 2421 . Along the extension direction X of the pole piece, the multiple first through holes 2421 and the multiple second through holes 251 are spaced apart.

[0155] The extension direction X of the electrode piece may be parallel to the length direction of the bottom insulating portion 242. The thickness direction of the electrode assembly 22 may be parallel to the width direction (eg, Y direction) of the bottom insulating portion 242.

[0156] When viewed along the extension direction X of the pole piece, the adjacent first through holes 2421 and second through holes 251 at least partially overlap.

[0157] Optionally, when viewed along the extension direction X of the pole piece, the first through hole 2421 and the second through hole 251 completely overlap.

[0158] In the above scheme, the number of second through holes 251 and the number of first through holes 2421 are both multiple, and the multiple first through holes 2421 and the multiple second through holes 251 are spaced apart to facilitate more electrolyte to pass through the insulating part 24 to infiltrate the electrode assembly 22, thereby improving the wetting effect and efficiency of the electrolyte on the electrode assembly 22.

[0159] Please refer to Figure 10. According to some embodiments of the present application, the isolation member 25 is connected to the insulating member 24 to form a plurality of connection portions 252. Along a first direction (such as the X direction), at least one first through hole 2421 and at least one second through hole 251 are provided between two adjacent connection portions 252. The first direction intersects with the thickness direction of the electrode assembly 22.

[0160] The spacer 25 and the insulating member 24 can be connected in various ways, for example, the spacer 25 and the insulating member 24 can be connected by hot melting, or by bonding. Optionally, the spacer 25 and the insulating member 24 are connected by hot melting so that the spacer 25 and the insulating member 24 are firmly connected.

[0161] The spacer 25 may be connected to the bottom insulating portion 242 of the insulating member 24 .

[0162] The plurality of connection portions 252 may be spaced apart along the first direction to firmly connect the separator 25 to the insulating member 24 . The first direction may be parallel to the length of the separator 25 , and the length of the separator 25 may be parallel to the length of the battery cell 20 .

[0163] In some embodiments, the length direction of the connection portion 252 may be parallel to the length direction Y of the first through hole 2421 .

[0164] In the above scheme, the isolating member 25 is connected to the insulating member 24 to form a plurality of connecting portions 252, so that the isolating member 25 and the insulating member 24 are firmly connected; at least one first through hole 2421 and at least one second through hole 251 are provided between two adjacent connecting portions 252 to reduce the obstruction of the connecting portion 252 to the electrolyte between the isolating member 25 and the insulating member 24, thereby facilitating the electrolyte at this position to flow to the first through hole 2421.

[0165] In some embodiments, the plurality of connection portions 252 may include a first connection portion 252a, a second connection portion 252b, and a third connection portion 252c spaced apart along the first direction. The first connection portion 252a and the third connection portion 252c are located at opposite ends of the isolation member 25 along the first direction, the second connection portion 252b is located between the first connection portion 252a and the third connection portion 252c, and the second connection portion 252b is located between two adjacent second through holes 251. This arrangement ensures a secure connection between the isolation member 25 and the insulating member 24.

[0166] Please refer to Figure 11, which is a cross-sectional view of an assembled spacer and bottom insulating portion according to some embodiments of the present application. According to some embodiments of the present application, spacer 25 has a first surface 253 facing insulating member 24. First surface 253 is provided with a first groove 254, which connects adjacent first through-hole 2421 and second through-hole 251.

[0167] The first surface 253 is the surface of the isolation member 25 facing the bottom insulating portion 242. The first groove 254 is provided on the first surface 253 and extends away from the bottom insulating portion 242. One end of the first groove 254 is connected to the second through hole 251.

[0168] At the adjacent first through hole 2421 and the second through hole 251 , viewed along the thickness direction Z of the bottom wall 2112 , the first through hole 2421 partially overlaps with the first groove 254 , so that the first groove 254 communicates with the adjacent first through hole 2421 and the second through hole 251 .

[0169] In some embodiments, the first groove 254 may be connected to all the second through holes 251 ; or, the number of the first grooves 254 is the same as the number of the second through holes 251 , and one first groove 254 is connected to one second through hole 251 .

[0170] In the above solution, the first groove 254 connects the first through hole 2421 and the second through hole 251 , so that the electrolyte between the separator 25 and the insulating member 24 can quickly enter the first through hole 2421 , thereby improving the efficiency of the electrolyte infiltrating the electrode assembly 22 .

[0171] 9 , according to some embodiments of the present application, along the first direction, the size of the battery cell 20 is L1, and the distance between adjacent first through holes 2421 and second through holes 251 is L2, satisfying 0<L2≤0.5L1, and the first direction intersects with the thickness direction of the electrode assembly 22 .

[0172] L1 may be a dimension of the housing 211 in a first direction (eg, X direction).

[0173] Optionally, L2 can be 0.1L1, 0.2L1, 0.3L1, 0.4L1, 0.5L1, etc.

[0174] In the above solution, the distance between the adjacent first through holes 2421 and the second through holes 251 satisfies the above relationship (0<L2≤0.5L1). On the one hand, it can reduce the risk of the detached active material layer contacting the shell 21, and on the other hand, it facilitates the rapid flow of the electrolyte to the first through holes 2421.

[0175] According to some embodiments of the present application, 1 mm ≤ L2 ≤ 20 mm.

[0176] Optionally, L2 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc.

[0177] In the above solution, compared with L2 < 1 mm, when L2 ≥ 1 mm, the risk of the detached active material layer contacting the shell 21 can be effectively reduced; compared with L2 > 20 mm, when L2 ≤ 20 mm, the electrolyte can flow quickly to the first through hole 2421.

[0178] According to some embodiments of the present application, the insulating member 25 is provided with a first positioning hole 255, which passes through the insulating member 25 along the thickness direction Z of the bottom wall 2112, and the insulating member is provided with a second positioning hole 2422 corresponding to the first positioning hole 255, which passes through the insulating member 24 along the thickness direction Z of the bottom wall 2112.

[0179] The second positioning hole 2422 and the first positioning hole 255 are both through holes, so that the positioning member can pass through the second positioning hole 2422 and the corresponding first positioning hole 255 .

[0180] The second positioning hole 2422 may be a through hole on the bottom insulating portion 242 , so as to facilitate positioning of the insulating member 24 and the isolation member 25 .

[0181] In the above scheme, the second positioning hole 2422 penetrates the insulating part 24 along the thickness direction Z of the bottom wall 2112, and the first positioning hole 255 penetrates the isolating part 25 along the thickness direction Z of the bottom wall 2112, so as to facilitate the positioning of the isolating part 25 and the bottom insulating part 242 in the thickness direction Z of the bottom wall 2112.

[0182] According to some embodiments of the present application, there are multiple first positioning holes 255 , and there are multiple second positioning holes 2422 . Each first positioning hole 255 is corresponding to one second positioning hole 2422 .

[0183] In the above embodiment, each first positioning hole 255 is provided in correspondence with a second positioning hole 2422, enabling positioning of the separator 25 and the insulating member 24 at multiple locations, thereby improving the positioning of the separator 25 and the insulating member 24. After the separator 25 and the insulating member 24 are assembled, at least one of the first positioning hole 255 and the second positioning hole 2422 is blocked to reduce the risk of contact between the detached active material layer and the housing 21.

[0184] According to some embodiments of the present application, the plurality of second positioning holes 2422 are respectively disposed at both ends of the insulating member 24 along a first direction, where the first direction intersects with a thickness direction of the electrode assembly 22 .

[0185] The plurality of second positioning holes 2422 are respectively disposed at two ends of the bottom insulating portion 242 along the first direction.

[0186] In the above solution, the plurality of second positioning holes 2422 are respectively disposed at both ends of the bottom insulating portion 242 along the first direction, so as to improve the positioning effect of the spacer 25 and the insulating member 24 .

[0187] Please refer to Figure 12, which is a schematic diagram of the structure of the bottom insulation portion and the electrode assembly according to some embodiments of the present application. According to some embodiments of the present application, along the thickness direction of the electrode assembly 22, the size of the electrode assembly 22 is W1, and the size of the first through hole 2421 is W2, satisfying 0.1W1≤W2≤W1.

[0188] As shown in FIG. 12 , the thickness direction of the electrode assembly 22 may be parallel to the Y direction.

[0189] Optionally, W2 can be 0.1W1, 0.2W1, 0.3W1, 0.4W1, 0.5W1, 0.6W1, 0.7W1, 0.8W1, 0.9W1, W1, etc.

[0190] In the above scheme, the dimension of the electrode assembly 22 along the thickness direction of the electrode assembly 22 and the dimension of the first through hole 2421 along the thickness direction of the electrode assembly 22 satisfy the above relationship (0.1W1≤W2≤W1). On the one hand, the first through hole 2421 can expose more layers of electrode sheets 223 to improve the effect of electrolyte infiltration of the electrode assembly 22. On the other hand, the insulating part 24 can also have higher strength.

[0191] According to some embodiments of the present application, 0.2W1≤W2≤0.7W1.

[0192] Optionally, W2 can be 0.2W1, 0.25W1, 0.3W1, 0.35W1, 0.4W1, 0.45W1, 0.5W1, 0.55W1, 0.6W1, 0.65W1, or 0.7W1.

[0193] In the above solution, compared with W2<0.2W1, when W2≥0.2W1, the first through hole 2421 can pass more electrolyte; compared with W2>0.7W1, when W2≤0.7W1, the insulating member 24 has higher strength.

[0194] Referring to FIG. 12 , according to some embodiments of the present application, along the first direction, the size of the first through hole 2421 is H1 , satisfying 0.5 mm ≤ H1 ≤ 10 mm, and the first direction intersects with the thickness direction of the electrode assembly 22 .

[0195] As shown in FIG. 12 , the first direction may be parallel to the X direction.

[0196] Optionally, H1 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.

[0197] In the above scheme, the size of the first through hole 2421 along the first direction satisfies the above relationship (0.5mm≤H1≤10mm). On the one hand, it is convenient for processing and manufacturing. On the other hand, it can facilitate more electrolyte to infiltrate the electrode assembly 22 through the first through hole 2421, and the insulating part 24 has higher strength.

[0198] According to some embodiments of the present application, 1 mm ≤ H1 ≤ 5 mm.

[0199] Alternatively, H1 may be 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm, 2.25 mm, 2.5 mm, 2.75 mm, 3 mm, 3.25 mm, 3.5 mm, 3.75 mm, 4 mm, 4.25 mm, 4.5 mm, 4.75 mm, 5 mm, etc.

[0200] In the above solution, compared with H1<1mm, when H1≥1mm, the processing difficulty is lower, which facilitates the electrolyte to infiltrate the electrode assembly 22; compared with H1>5mm, when H1≤5mm, the insulating member 24 has higher strength.

[0201] Please refer to Figures 3 and 8, and further to Figure 13, which is a schematic diagram of the assembly of an insulating member and an electrode assembly according to some embodiments of the present application. According to some embodiments of the present application, the electrode assembly 22 is a wound structure, and the electrode assembly 22 includes a straight region 224 and a corner region 225. The corner region 225 is disposed at both ends of the straight region 224 in the longitudinal direction, and the first through hole 2421 is disposed opposite the straight region 224 and / or the corner region 225.

[0202] The electrode assembly 22 is flat, such that the electrode assembly 22 includes a straight region 224 and corner regions 225 located at both ends of the straight region 224. The straight region 224 refers to a region of the electrode assembly 22 having a parallel structure, that is, the surfaces of the negative electrode sheet, the positive electrode sheet, and the separator within the straight region 224 are all flat. The corner region 225 refers to a region of the electrode assembly 22 having a bent structure, and the negative electrode sheet, the positive electrode sheet, and the separator within the corner region 225 are all bent, that is, the surface of each layer of the negative electrode sheet, the positive electrode sheet, and the separator of the electrode assembly 22 in the corner region 225 is a curved surface.

[0203] In some embodiments, a portion of the plurality of first through holes 2421 is directly opposite the straight region 224. Among the plurality of first through holes 2421 located in this region, the length direction Y of each first through hole 2421 is parallel to or inclined with the thickness direction of the electrode assembly 22, so that the first through hole 2421 can expose the multi-layer electrode sheet 223. Optionally, among the plurality of first through holes 2421 located in this region, the length direction Y of each first through hole 2421 is parallel to the thickness direction of the electrode assembly 22, and the extension trajectory of the first through hole 2421 is a straight line, which facilitates processing and manufacturing.

[0204] In some embodiments, the thickness direction of the electrode assembly 22 is parallel to the width direction of the bottom insulating portion 242 , and among the multiple first through holes 2421 facing the straight area 224 , the length direction Y of each first through hole 2421 can be parallel to the width direction of the bottom insulating portion 242 .

[0205] In some embodiments, in the thickness direction Z of the bottom insulating portion 242, another portion of the plurality of first through-holes 2421 is directly opposite the corner region 225. Among the plurality of first through-holes 2421 located in this region, the length direction Y of each first through-hole 2421 intersects or is inclined with the stacking direction of the plurality of pole pieces 223, thereby exposing the multiple layers of pole pieces 223. Optionally, among the plurality of first through-holes 2421 located in this region, the length direction Y of each first through-hole 2421 can be parallel to the radial direction of the corner region 225, and the extension trajectory of the first through-hole 2421 can be a straight line.

[0206] In the above embodiment, when the electrode assembly 22 has a wound structure, first through-holes 2421 are provided at positions corresponding to the bottom insulating portion 242 and the straight region 224. This allows the first through-holes 2421 to expose more layers of the electrode sheets 223, thereby improving the efficiency of electrolyte wetting the electrode assembly 22. First through-holes 2421 are provided at positions corresponding to the insulating member 24 and the corner regions 225 to improve the efficiency of electrolyte wetting the electrode assembly 22 at the corner regions 225.

[0207] 3 and 8 , according to some embodiments of the present application, the electrode assembly 22 is a flat structure.

[0208] The electrode assembly 22 is a flat structure, and can be a stacked structure or a wound structure. In some embodiments, the length direction Y of each first through hole 2421 can be parallel to or inclined with the thickness direction of the electrode assembly 22 .

[0209] In the above scheme, the electrode assembly 22 is a flat structure, and multiple pole pieces 223 are stacked in the thickness direction of the electrode assembly 22. The length direction Y of the first through hole 2421 is parallel to or intersects with the thickness direction of the electrode assembly 22, so that the electrolyte passing through the first through hole 2421 can infiltrate more electrode assemblies 22, thereby improving the efficiency of the electrolyte infiltrating the electrode assembly 22.

[0210] According to some embodiments of the present application, there are multiple first through holes 2421, and the multiple first through holes 2421 are spaced apart in the thickness direction of the electrode assembly 22. For example, multiple columns of first through holes 2421 are spaced apart along the length direction of the bottom insulating portion 242, and two first through holes 2421 are spaced apart in each column of first through holes 2421 along the thickness direction of the electrode assembly 22.

[0211] In an embodiment where the electrode assembly 22 is a wound structure, the two first through holes 2421 along the thickness direction of the electrode assembly 22 are located on both sides of the winding center of the electrode assembly 22, so that the bottom insulating portion 242 can have higher strength while exposing the multi-layer pole piece 223.

[0212] According to some embodiments of the present application, a battery 100 is further provided. The battery 100 includes a battery cell 20 as provided in any of the above embodiments.

[0213] According to some embodiments of the present application, an electrical device is provided, which includes a battery cell 20 or a battery 100 provided in any of the above embodiments, and the battery cell 20 or the battery 100 is used to provide electrical energy.

[0214] According to some embodiments of the present application, please refer to Figures 3 to 13. The embodiments of the present application provide a battery cell 20. The battery cell 20 is a rectangular parallelepiped. The battery cell 20 includes a shell 21, an electrode assembly 22, an insulating member 24, an isolating member 25 and an electrode terminal 23.

[0215] The housing 21 includes a shell 211 and an end cap 212. The shell 211 includes a side wall 2111 and a bottom wall 2112. One end of the side wall 2111 is connected to the bottom wall 2112, and the other end is open. The end cap 212 seals the opening of the shell 211. The electrode terminal 23 is mounted on the end cap 212, which is provided with a liquid injection hole.

[0216] The electrode assembly 22 is disposed in the housing 21. The tab 222 of the electrode assembly 22 is electrically connected to the electrode terminal 23. The electrode assembly 22 has a first end surface 22a, which is disposed opposite to the bottom wall 2112.

[0217] The insulating member 24 includes a side insulating portion 241 and a bottom insulating portion 242. The side insulating portion 241 wraps around the periphery of the electrode assembly 22. The bottom insulating portion 242 is connected to the side insulating portion 241 and wraps around the bottom of the electrode assembly 22. Part of the bottom insulating portion 242 is located between the first end surface 22a and the bottom wall 2112. The end of the side insulating portion 241 away from the bottom insulating portion 242 forms an opening, which is arranged toward the end cap 212. The bottom insulating portion 242 is provided with a plurality of first through holes 2421. The first through holes 2421 are strip-shaped holes. The length direction Y of each first through hole 2421 is parallel to or inclined with the stacking direction of the multiple electrode pieces 223 exposed by the first through hole 2421. The bottom insulating portion 242 is rectangular.

[0218] The isolator 25 is a rectangular plate-shaped structure. It is disposed within the housing 21 and located between the bottom insulating portion 242 and the bottom wall 2112. The length of the isolator 25 is parallel to the length of the bottom insulating portion 242, and the width of the isolator 25 is parallel to the width of the bottom insulating portion 242. The isolator 25 is provided with a second through hole 251. Along the thickness direction Z of the bottom insulating portion 242, the second through hole 251 does not overlap with the first through hole 2421.

[0219] The electrode assembly 22 is a wound structure, and the electrode assembly 22 includes a straight area 224 and a corner area 225. The corner area 225 is arranged at both ends of the straight area 224 in the length direction. There are multiple first through holes 2421. In the thickness direction Z of the bottom insulating portion 242, a part of the multiple first through holes 2421 is opposite to the straight area 224, and another part of the multiple first through holes 2421 is opposite to the corner area 225.

[0220] The second through holes 251 are strip-shaped holes, and their length direction is parallel to the length direction Y of the first through holes 2421. The number of second through holes 251 is greater than the number of first through holes 2421. Along the first direction, the plurality of first through holes 2421 and the plurality of second through holes 251 are spaced apart.

[0221] Isolator 25 is thermally fused to bottom insulating portion 242 to form a plurality of connecting portions 252. Connecting portions 252 are spaced apart along a first direction parallel to the length of bottom insulating portion 242. Along the first direction, at least one first through hole 2421 and at least one second through hole 251 are provided between adjacent connecting portions 252.

[0222] According to the battery cell 20 of the embodiment of the present application, the isolation member 25 is provided with a plurality of second through holes 251, and the bottom insulating portion 242 is provided with a plurality of first through holes 2421. The plurality of first through holes 2421 and the plurality of second through holes 251 are spaced apart along the first direction so that the electrolyte accumulated on the bottom wall 2112 of the outer shell 21 can flow from the second through holes 251 and the first through holes 2421 into the accommodating cavity 240 surrounded by the insulating member 24. More electrolyte infiltrates the electrode assembly 22 from the bottom, which can improve the efficiency of the electrode assembly 22 being infiltrated, and the infiltration interface is good, thereby improving the yield of the battery cell 20 and reducing the production cost.

[0223] 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: shell; An electrode assembly, contained in the housing, wherein the electrode assembly is formed by winding and / or stacking electrode sheets, and the electrode assembly has a first end surface; an insulating member, at least partially disposed between the first end surface and the housing; Wherein, at least one first through hole is provided on the portion of the insulating member opposite to the first end face, the first through hole is a strip-shaped hole, and the length direction of each first through hole is parallel or inclined to the stacking direction of the pole piece exposed by the first through hole.

2. The battery cell according to claim 1, characterized in that: There are a plurality of the first through holes, and the plurality of the first through holes are arranged at intervals.

3. The battery cell according to claim 2, characterized in that: The plurality of first through holes are arranged at intervals along the extension direction of the pole piece.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The first end surface is arranged facing the bottom wall of the housing, and the battery cell further comprises an isolating member, which is arranged in the housing and between the insulating member and the bottom wall; The isolating member is provided with a second through hole, the second through hole is a strip-shaped hole, and the length direction of the second through hole is parallel to the length direction of the first through hole.

5. The battery cell according to claim 4, characterized in that: Along the thickness direction of the bottom wall, the second through hole does not overlap with the first through hole.

6. The battery cell according to claim 4 or 5, characterized in that: The number of the second through holes is greater than the number of the first through holes.

7. The battery cell according to any one of claims 4 to 6, characterized in that: The number of the second through holes is plural, the number of the first through holes is plural, and along the extension direction of the pole piece, the plurality of the first through holes and the plurality of the second through holes are arranged at intervals.

8. The battery cell according to claim 7, characterized in that: The isolation member and the insulating member are connected to form a plurality of connection parts. Along a first direction, at least one first through hole and at least one second through hole are provided between two adjacent connection parts. The first direction intersects with a thickness direction of the electrode assembly.

9. The battery cell according to any one of claims 6 to 8, characterized in that: The isolation member has a first surface facing the insulating member, the first surface is provided with a first groove, and the first groove communicates with the adjacent first through hole and the second through hole.

10. The battery cell according to any one of claims 7 to 9, characterized in that: Along the first direction, the size of the battery cell is L1, and the distance between the adjacent first through holes and the second through holes is L2, satisfying 0<L2≤0.5L1, and the first direction intersects with the thickness direction of the electrode assembly.

11. The battery cell according to claim 10, characterized in that: 1mm≤L2≤20mm.

12. The battery cell according to any one of claims 4 to 11, characterized in that: The isolating member is provided with a first positioning hole, which penetrates the isolating member along the thickness direction of the bottom wall, and the insulating member is provided with a second positioning hole corresponding to the first positioning hole, which penetrates the insulating member along the thickness direction of the bottom wall.

13. The battery cell according to claim 12, characterized in that: There are a plurality of the first positioning holes, and a plurality of the second positioning holes. Each of the first positioning holes is arranged correspondingly to one of the second positioning holes.

14. The battery cell according to claim 13, characterized in that: The plurality of second positioning holes are respectively disposed at two ends of the insulating member along a first direction, and the first direction intersects with a thickness direction of the electrode assembly.

15. The battery cell according to any one of claims 1 to 14, characterized in that: Along the thickness direction of the electrode assembly, the size of the electrode assembly is W1, and the size of the first through hole is W2, satisfying 0.1W1≤W2≤W1.

16. The battery cell according to claim 15, characterized in that: 0.2W1≤W2≤0.7W1.

17. The battery cell according to any one of claims 1 to 16, characterized in that: Along the first direction, the size of the first through hole is H1, satisfying 0.5 mm≤H1≤10 mm, and the first direction intersects with the thickness direction of the electrode assembly.

18. The battery cell according to claim 17, characterized in that: 1mm≤H1≤5mm.

19. The battery cell according to any one of claims 1 to 18, characterized in that: The electrode assembly is a winding structure, and includes a straight area and a corner area. The corner area is arranged at both ends of the straight area in the length direction, and the first through hole is arranged opposite to the straight area and / or the corner area.

20. The battery cell according to any one of claims 1 to 19, characterized in that: The electrode assembly is a flat structure.

21. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 20.

22. An electrical equipment, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 20 or the battery according to claim 21, wherein the battery cell or the battery is used to provide electrical energy.

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