Battery cell, battery, and electric device

Abstract

Embodiments of the present application provide a battery cell, a battery, and an electric device. The battery cell comprises a housing, an electrode assembly, and a first insulating member. The housing comprises a first wall; the electrode assembly is arranged in the housing; the first insulating member is arranged in the housing and located between the electrode assembly and the first wall, and the first insulating member is in contact with the electrode assembly; and the first insulating member is provided with a first surface facing the electrode assembly, and grooves are formed in the first surface. The technical solution provided by the present application can improve the reliability of the battery.

Description

Battery cells, batteries and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application CN202322124408.7, filed on August 8, 2023, entitled “Battery Cell, Battery and Electrical Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] 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

[0004] 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.

[0005] During the manufacturing process of batteries, battery reliability is an issue that cannot be ignored. Therefore, how to improve battery reliability is a technical problem that needs to be solved urgently in battery technology.

[0006] Summary of the Invention

[0007] The present application provides a battery cell, a battery, and an electrical device, which can improve the reliability of the battery.

[0008] This application is achieved through the following technical solutions:

[0009] In a first aspect, embodiments of the present application provide a battery cell comprising a housing, an electrode assembly, and a first insulating member. The housing comprises a first wall; the electrode assembly is disposed within the housing; the first insulating member is disposed within the housing and between the electrode assembly and the first wall, contacting the electrode assembly; the first insulating member has a first surface facing the electrode assembly, and the first surface is provided with a groove.

[0010] According to the battery cell of the embodiment of the present application, a first insulating member is arranged between the first wall and the electrode assembly. The first insulating member is in contact with the electrode assembly to insulate and isolate the electrode assembly from the first wall, and a groove is provided on the first surface of the first insulating member facing the electrode assembly. When the battery cell is used upside down, the electrode assembly is located above the first insulating member. The groove can accommodate the active material layer that falls off the electrode assembly, thereby reducing the probability of the active material layer contacting the outer shell, and further reducing the risk of outer shell corrosion and leakage, so that the battery cell has higher reliability.

[0011] According to some embodiments of the present application, in the thickness direction of the first wall, the groove does not penetrate the first insulating member.

[0012] In the above solution, the groove does not penetrate the first insulating member, and the groove can constrain the active material layer entering the groove, thereby reducing the risk of the active material layer entering the groove passing through the first insulating member along the thickness direction of the first wall.

[0013] According to some embodiments of the present application, in the thickness direction of the first wall, the depth of the groove is H1, satisfying 0.2 mm ≤ H1 ≤ 4 mm.

[0014] In the above solution, the depth H1 of the groove satisfies the above relationship (0.2mm≤H1≤4mm). On the one hand, it can store more active material layers and electrolytes, which can reduce the risk of the active material layers clogging the grooves. On the other hand, it can facilitate the isolation membrane to absorb the electrolyte back.

[0015] According to some embodiments of the present application, 1 mm ≤ H1 ≤ 2 mm.

[0016] In the above scheme, compared with H1 < 1 mm, when H1 ≥ 1 mm, the groove can accommodate more active material layers and electrode liquid, which can reduce the risk of the active material layer clogging the groove; compared with H1 > 2 mm, when H1 ≤ 2 mm, the depth of the groove is shallower, which is convenient for the isolation membrane to reabsorb the electrolyte, and the electrolyte reflux effect is better.

[0017] According to some embodiments of the present application, the first insulating member is a plate-shaped structure.

[0018] In the above scheme, the first insulating member is a plate-like structure, which has a large contact area with the electrode assembly, effectively increasing the force-bearing area of ​​the electrode assembly, improving the problem of the active material layer of the electrode assembly falling off, and thus extending the service life of the battery cell; in addition, the first insulating member is a plate-like structure, which can reduce the size of the first insulating member along its own thickness direction, thereby reducing the space occupancy rate of the first insulating member in the outer shell, which is beneficial to improving the energy density of the battery cell.

[0019] According to some embodiments of the present application, the battery cell also includes a pressure relief mechanism, which is arranged on the first wall. The first surface includes a first area, a second area, and a third area arranged in sequence along the first direction. The second area is arranged corresponding to the pressure relief mechanism. The first area and the third area are both provided with grooves, and the first direction intersects with the thickness direction of the first wall.

[0020] In the above solution, the first area and the third area are both provided with grooves, so as to facilitate the collection of the detached active material layer at multiple locations.

[0021] According to some embodiments of the present application, the first region is provided with a plurality of grooves, which are arranged in a matrix; and / or the third region is provided with a plurality of grooves, which are arranged in a matrix.

[0022] In the above solution, the plurality of grooves are arranged in a matrix, which can form a larger space for accommodating the active material layer in the corresponding area, thereby facilitating the collection of the active material layer.

[0023] According to some embodiments of the present application, the groove is a blind hole.

[0024] In the above solution, the groove is a blind hole, which can reduce the risk of the active material layer penetrating the first insulating member and contacting the outer shell.

[0025] According to some embodiments of the present application, the groove is in the shape of an elongated strip, and the length direction of the groove is parallel to the first direction.

[0026] In the above solution, the groove is in the shape of an elongated strip and is parallel to the first direction, which is convenient for processing and manufacturing and can accommodate more active material layers and electrolytes.

[0027] According to some embodiments of the present application, the width of the groove is W, satisfying 0.2 mm ≤ W ≤ 5 mm.

[0028] In the above solution, the width W of the groove satisfies the above relationship (0.2mm≤W≤5mm). On the one hand, the processing and manufacturing difficulty is relatively low. On the other hand, it can reduce the risk of the groove opening scratching the isolation membrane and active material layer and causing damage to the electrode assembly.

[0029] According to some embodiments of the present application, 2mm≤W≤3.5mm.

[0030] In the above scheme, compared with W < 2 mm, when W ≥ 2 mm, it is easy to process and manufacture, and the processing and manufacturing difficulty is lower; compared with W > 3.5 mm, when W ≤ 3.5 mm, the opening of the groove is not easy to scratch the isolation membrane and the active material layer, reducing the risk of damage to the electrode assembly.

[0031] According to some embodiments of the present application, the first direction is parallel to the length direction of the first wall.

[0032] In the above solution, the first direction is parallel to the length direction of the first wall, so that the first insulating member can have a larger area and can have a larger overlapping area with the electrode assembly.

[0033] According to some embodiments of the present application, the second region is provided with a through hole.

[0034] In the above solution, the second area is provided with a through hole so that when the pressure relief mechanism releases pressure, the gas quickly passes through the first insulating member to flow toward the pressure relief mechanism, thereby achieving timely pressure relief.

[0035] According to some embodiments of the present application, the battery cell further includes a second insulating member disposed between the first insulating member and the first wall, and the first insulating member is configured to support the electrode assembly.

[0036] In the above solution, the first insulating member can provide a good supporting effect on the electrode assembly, and when used in conjunction with the second insulating member, it can reduce the risk of internal short circuit in the battery cell and the risk of contact between the active material layer and the shell.

[0037] According to some embodiments of the present application, the battery cell further includes an electrode terminal, which is disposed on the first wall and passes through the second insulating member. The electrode assembly includes a main body and a tab extending from the main body, which bypasses the first insulating member and is electrically connected to the electrode terminal.

[0038] In the above solution, the electrode terminal is arranged on the first wall to form the output electrode of the battery cell, and the electrode tab of the electrode assembly bypasses the first insulating member and is connected to the electrode terminal, so that the electrode assembly is electrically connected to the electrode terminal.

[0039] According to some embodiments of the present application, the battery cell further includes a transition piece disposed between the second insulating piece and the first insulating piece, the transition piece connecting the electrode terminal and the tab.

[0040] In the above solution, the battery cell is provided with an adapter, so that the tab and the electrode terminal are electrically connected through the adapter.

[0041] According to some embodiments of the present application, the battery cell also includes an electrode terminal, which is arranged on the first wall. The electrode assembly includes a main body and a pole ear extending from the main body. The pole ear is electrically connected to the electrode terminal by bypassing the first insulating member. The first surface includes a main body area and an avoidance area. The main body area is configured to support the main body, and the avoidance area is used to avoid the pole ear.

[0042] In the above solution, the main body area contacts and supports the main body, so that the electrode assembly is effectively supported; the avoidance area avoids the tab to reduce the interference between the first insulating member and the tab, thereby reducing the assembly space.

[0043] According to some embodiments of the present application, the electrode assembly includes a separator, one end of which extends into the groove.

[0044] In the above solution, one end of the isolation membrane extends into the groove, and can use capillary action to suck back the electrolyte contained in the groove.

[0045] According to some embodiments of the present application, along the thickness direction of the first wall, the projection of the electrode assembly completely falls within the first surface.

[0046] In the above solution, the projection of the electrode assembly completely falls within the first surface, which helps increase the contact area between the first insulating member and the electrode assembly, thereby increasing the force-bearing area of ​​the electrode assembly and alleviating decarburization issues. Furthermore, even if decarburization of the electrode assembly occurs, the first insulating member can effectively absorb and adsorb the detached carbon powder, effectively reducing the probability of carbon powder landing on the housing, pressure relief mechanism, or other components. This reduces the possibility of abnormalities such as housing corrosion and pressure relief mechanism blockage, effectively extending the service life of the battery cells and the battery life.

[0047] According to some embodiments of the present application, the housing includes a shell and an end cover, the shell has an opening, the end cover covers the opening, and the end cover is a first wall.

[0048] In the above solution, the end cover is the first wall, which facilitates the assembly of the first insulating member and the first wall.

[0049] In a second aspect, an embodiment of the present application further provides a battery, comprising a battery cell as provided in any of the above embodiments.

[0050] In a third aspect, an embodiment of the present application further provides an electrical device, comprising a battery cell or battery as provided in any of the above embodiments, wherein the battery cell or battery is used to provide electrical energy.

[0051] 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

[0052] 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.

[0053] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0054] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0055] FIG3 is an exploded view of a battery cell provided in some embodiments of the present application;

[0056] FIG4 is a cross-sectional view of a battery cell provided in some embodiments of the present application;

[0057] FIG5 is a partial enlarged view of point A in FIG4 ;

[0058] FIG6 is a perspective view of a first insulating member provided in some embodiments of the present application;

[0059] FIG7 is a plan view of the first insulating member provided in FIG6;

[0060] FIG8 is a perspective view of a first insulating member provided in some other embodiments of the present application;

[0061] FIG9 is a plan view of the first insulating member provided in FIG8;

[0062] FIG10 is a partial enlarged view of point B in FIG9 ;

[0063] FIG11 is a schematic diagram of the connection between electrode terminals and tabs provided in some embodiments of the present application;

[0064] FIG12 is a schematic diagram of the assembly of the isolation membrane and the groove provided in some embodiments of the present application.

[0065] In the drawings, the drawings are not drawn to scale.

[0066] Marking instructions: 100-battery; 10-case; 11-first sub-case; 12-second sub-case; 20-battery cell; 21-housing; 210-first wall; 211-shell; 212-end cover; 22-electrode assembly; 221-main body; 222-ear; 223-isolation membrane; 23-first insulating member; 231-first surface; 231a-first area; 231b-second area; 231c-third area; 232-groove; 233-through hole; 234-main body area; 235-avoidance area; 24-pressure relief mechanism; 25-second insulating member; 26-electrode terminal; 27-adapter; 200-controller; 300-motor; 1000-vehicle; X-first direction; Y-second direction; Z-thickness direction of the first wall. DETAILED DESCRIPTION

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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).

[0073] 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.

[0074] 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.

[0075] 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.

[0076] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.).

[0083] 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.

[0084] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] In some embodiments, the electrode assembly is a laminate structure.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] In some embodiments, the housing is provided with an explosion-proof valve for releasing the internal pressure of the battery cell.

[0097] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery. The polygonal battery is, for example, a hexagonal battery, etc. There is no special limitation in the embodiments of the present application.

[0098] The development of battery technology must take into account multiple design factors at the same time, such as energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0099] In some technologies, battery cells are typically placed upside down for use, with the side of the battery cell with the electrode terminals facing the bottom of the battery cell housing. However, when the battery cell is used upside down, the active material layer (such as carbon powder) is prone to falling off. The fallen active material layer easily comes into contact with the outer casing, causing corrosion and leakage of the outer casing, thereby shortening the battery cell's service life and reducing the reliability of the battery cell.

[0100] In view of this, an embodiment of the present application provides a battery cell, in which a first insulating member is arranged between the first wall and the electrode assembly, and the first insulating member is in contact with the electrode assembly to insulate and isolate the electrode assembly from the first wall. A groove is provided on the first surface of the first insulating member facing the electrode assembly to reduce the probability of contact between the active material layer and the outer shell, thereby reducing the risk of corrosion and leakage of the outer shell, so as to improve the reliability of the battery cell.

[0101] In such a battery cell, when the battery cell is used upside down, the first insulating member is located below the electrode assembly. By providing a groove on the first surface of the first insulating member facing the electrode assembly, the groove can accommodate the active material layer that has fallen off the electrode assembly, so as to constrain the fallen active material layer, reduce the probability of the active material layer contacting the outer shell, and thereby reduce the risk of outer shell corrosion and leakage, so that the battery cell has higher reliability.

[0102] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical equipment.

[0103] The embodiments of the present application provide an electrical device that uses a battery cell as a power source. The electrical 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] Please refer to Figures 3 to 5. Figure 3 is an exploded view of a battery cell provided in some embodiments of the present application, Figure 4 is a cross-sectional view of a battery cell provided in some embodiments of the present application, and Figure 5 is a partial enlarged view of point A in Figure 4. According to some embodiments of the present application, an embodiment of the present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, and a first insulating member 23. The housing 21 includes a first wall 210; the electrode assembly 22 is disposed inside the housing 21; the first insulating member 23 is disposed inside the housing 21 and is located between the electrode assembly 22 and the first wall 210, and the first insulating member 23 is in contact with the electrode assembly 22; wherein the first insulating member 23 has a first surface 231 facing the electrode assembly 22, and the first surface 231 is provided with a groove 232.

[0112] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained in the housing 21. The electrode assembly 22 is mainly formed by winding 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 avoid 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 of the electrode assembly 22, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0113] The housing 21 provides space for components such as the electrode assembly 22, the first insulating member 23, and the electrolyte. The housing 21 may include a shell 211 and an end cap 212. The shell 211 has an opening, and the end cap 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0114] 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.

[0115] 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.

[0116] The first wall 210 may be an end cap 212 or a wall of the housing 211. When the battery cell 20 is used upside down, the first wall 210 is located below the electrode assembly 22, and the first insulating member 23 can support the electrode assembly 22.

[0117] The first insulating member 23 is disposed within the housing 21 and is located between the electrode assembly 22 and the first wall 210, thereby insulating and isolating the electrode assembly 22 from the first wall 210. In some embodiments, the first insulating member 23 may be disposed on the inner surface of the first wall 210, with both ends of the first insulating member 23 along the thickness direction of the first wall 210 contacting the first wall 210 and the electrode assembly 22, respectively. In some embodiments, the first insulating member 23 may also be connected to the first wall 210 via another component (e.g., an insulating component), with the first insulating member 23 contacting the first wall 210 via this component.

[0118] The first surface 231 is a surface of the first insulating member 23 facing the electrode assembly 22 , and the first surface 231 is disposed away from the first wall 210 .

[0119] The groove 232 is provided on the first surface 231 and is recessed toward the first wall 210 . The opening of the groove 232 faces the electrode assembly 22 , so that the active material layer shed from the electrode assembly 22 above the first insulating member 23 can enter the groove 232 .

[0120] According to the battery cell 20 of the embodiment of the present application, a first insulating member 23 is disposed between the first wall 210 and the electrode assembly 22. The first insulating member 23 contacts the electrode assembly 22 to insulate and isolate the electrode assembly 22 from the first wall 210. Furthermore, a groove 232 is provided on a first surface 231 of the first insulating member 23 facing the electrode assembly 22. When the battery cell 20 is inverted for use, with the first wall 210 facing downward and the electrode assembly 22 positioned above the first insulating member 23, the groove 232 can accommodate active material layers that fall off the electrode assembly 22, thereby reducing the probability of the active material layer contacting the outer shell 21, and further reducing the risk of corrosion and leakage of the outer shell 21, thereby ensuring that the battery cell 20 has higher reliability.

[0121] According to some embodiments of the present application, the material of the first insulating member 23 may be at least one of polyethylene, polypropylene, polyimide, polytetrafluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, ethylene tetrafluoroethylene copolymer, propylene tetrafluoroethylene copolymer, fluorinated ethylene propylene copolymer, and vinylidene fluoride hexafluoropropylene copolymer.

[0122] The first insulating member 23 can be made of a polymer. For example, the polymer can be a polymer rich in electrolyte-philic polar groups such as polyimide. The first insulating member 23 made of this polymer will have better liquid absorption capacity, thereby improving the ability of the first insulating member 23 to absorb electrolyte, improving the electrolyte infiltration effect on the electrode assembly 22, and improving the long-term performance of the battery cell 20.

[0123] The material of the first insulating member 23 is made of at least one of the above-mentioned polymers. While supporting the electrode assembly 22, it has good insulation performance. At the same time, the first insulating member 23 has good liquid absorption ability, which can effectively improve the wetting effect of the electrolyte on the electrode assembly 22, thereby effectively improving the performance of the battery cell 20.

[0124] Referring to FIG. 5 , according to some embodiments of the present application, in the thickness direction Z of the first wall 210 , the groove 232 does not penetrate the first insulating member 23 .

[0125] In the figure, the direction indicated by the letter Z may be the thickness direction of the first wall 210 .

[0126] The first insulating member 23 further has a second surface facing away from the electrode assembly 22, and the second surface is disposed toward the first wall 210. The groove 232 extends from the first surface 231 along the thickness direction Z of the first wall 210 toward the second surface, but the groove 232 does not extend to the second surface, so that the groove 232 does not penetrate the first insulating member 23. In some embodiments, the depth direction of the groove 232 can be parallel to the thickness direction Z of the first wall 210.

[0127] In the above solution, the groove 232 does not penetrate the first insulating member 23 . The groove 232 can constrain the active material layer entering the groove 232 , reducing the risk of the active material layer entering the groove 232 passing through the first insulating member 23 along the thickness direction Z of the first wall 210 .

[0128] Referring to FIG. 5 , according to some embodiments of the present application, in the thickness direction Z of the first wall 210 , the depth of the groove 232 is H1 , satisfying 0.2 mm ≤ H1 ≤ 4 mm.

[0129] The depth direction of the groove 232 may be parallel to the thickness direction Z of the first wall 210 . The depth of the groove 232 may be the distance between the bottom wall of the groove 232 and the first wall 210 in the thickness direction Z of the first wall 210 .

[0130] Alternatively, H1 may be, but is not limited to, 0.2 mm, 0.25 mm, 0.5 mm, 0.75 mm, 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, etc.

[0131] In the above solution, the depth H1 of the groove 232 satisfies the above relationship (0.2mm≤H1≤4mm). On the one hand, it can store more active material layers and electrolytes, which can reduce the risk of the active material layers clogging the grooves 232. On the other hand, it can facilitate the isolation membrane to absorb the electrolyte back.

[0132] According to some embodiments of the present application, 1 mm ≤ H1 ≤ 2 mm.

[0133] Alternatively, H1 may be, but is not limited to, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc.

[0134] In the above scheme, compared with H1<1mm, when H1≥1mm, the groove 232 can accommodate more active material layers and electrode liquid, which can reduce the risk of the active material layer clogging the groove 232; compared with H1>2mm, when H1≤2mm, the depth of the groove 232 is shallower, which is convenient for the isolation membrane to reabsorb the electrolyte, and the electrolyte reflux effect is better.

[0135] Referring to FIG. 3 , according to some embodiments of the present application, the first insulating member 23 is a plate-shaped structure.

[0136] The first insulating member 23 may be a flat plate structure. For example, the first insulating member 23 may be a rectangular plate.

[0137] The first surface 231 may be in full contact with the electrode assembly 22, or only partially in contact with the electrode assembly 22. Similarly, the end of the electrode assembly 22 facing the first surface 231 may be in full contact with the first surface 231, or only partially in contact with the first surface 231.

[0138] In the above scheme, the first insulating member 23 is a plate-like structure, and has a large contact area with the electrode assembly 22, which effectively increases the force-bearing area of ​​the electrode assembly 22, improves the problem of the active material layer of the electrode assembly 22 falling off, and thus extends the service life of the battery cell 20; in addition, the first insulating member 23 is a plate-like structure, which can reduce the size of the first insulating member 23 along its own thickness direction, thereby reducing the space occupancy rate of the first insulating member 23 in the outer shell 21, which is beneficial to improving the energy density of the battery cell 20.

[0139] Please refer to Figure 3 and further to Figures 6 to 9. Figure 6 is a perspective view of a first insulating member provided in some embodiments of the present application, Figure 7 is a plan view of the first insulating member provided in Figure 6, Figure 8 is a perspective view of a first insulating member provided in other embodiments of the present application, and Figure 9 is a plan view of the first insulating member provided in Figure 8. According to some embodiments of the present application, the battery cell 20 further includes a pressure relief mechanism 24, which is disposed on the first wall 210. The first surface 231 includes a first region 231a, a second region 231b, and a third region 231c sequentially arranged along a first direction X, with the second region 231b being disposed corresponding to the pressure relief mechanism 24. The first region 231a and the third region 231c are both provided with a groove 232. The first direction X intersects with the thickness direction Z of the first wall 210.

[0140] In the figure, the direction indicated by the letter X may be the first direction.

[0141] The pressure relief mechanism 24 refers to an element or component that is actuated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on the material of one or more of the positive electrode plate, negative electrode plate, electrolyte and isolation membrane in the battery cell 20. The pressure relief mechanism 24 can take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 24 performs an action or the weak structure provided in the pressure relief mechanism 24 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0142] The first direction X intersects with the thickness direction Z of the first wall 210 , and the first direction X may be parallel to the length direction of the first wall 210 .

[0143] The first area 231 a , the second area 231 b and the third area 231 c are sequentially arranged along the first direction X. The first surface 231 may have a larger size in the first direction X, that is, the first direction X may be parallel to the length direction of the first surface 231 .

[0144] The second area 231 b is provided corresponding to the pressure relief mechanism 24 . For example, along the thickness direction Z of the first wall 210 , the projection of the pressure relief mechanism 24 on the first surface 231 falls into the second area 231 b .

[0145] In some embodiments, the second region 231 b may be provided with a through hole 233 .

[0146] The through hole 233 penetrates the first insulating member 23 along the thickness direction Z of the first wall 210 . The through hole 233 connects the first surface 231 and the second surface, so that gas can pass through the first insulating member 23 and flow toward the pressure relief mechanism 24 .

[0147] The second area 231 b is provided with a through hole 233 so that when the pressure relief mechanism 24 releases pressure, gas can quickly pass through the first insulating member 23 and flow toward the pressure relief mechanism 24 to achieve timely pressure relief.

[0148] In some embodiments, an insulating structure (such as a second insulating member) can be provided at a corresponding position of the pressure relief mechanism 24. The insulating structure is provided between the first insulating member 23 and the first wall 210. After the active material layer falls into the through hole 233, it is received by the insulating structure and cannot directly contact the pressure relief mechanism 24.

[0149] The first area 231a and the third area 231c are respectively located at both ends of the second area 231b along the first direction X. The sizes of the first area 231a and the third area 231c in the first direction X are larger than the size of the second area 231b in the first direction X, so that a larger groove 232 is set on the first surface 231.

[0150] In the above solution, the first area 231 a and the third area 231 c are both provided with grooves 232 so as to collect the fallen active material layer at multiple locations.

[0151] 6 to 9 , according to some embodiments of the present application, the first region 231 a is provided with a plurality of grooves 232 , which are arranged in a matrix; and / or the third region 231 c is provided with a plurality of grooves 232 , which are arranged in a matrix.

[0152] Within the first region 231a, multiple grooves 232 can be arranged in a matrix to create spaces for accommodating the active material layer at multiple locations within the first region 231a, facilitating the collection of detached active material layers. For example, within the first region 231a, multiple grooves 232 can be spaced apart along both the first direction X and the second direction Y. In the figure, the direction indicated by the letter Y can be the second direction, which can be parallel to the width of the first wall 210. The second direction Y, the first direction X, and the thickness direction Z of the first wall 210 are perpendicular to each other.

[0153] Within the third region 231c, the plurality of grooves 232 may be arranged in a matrix to form spaces for accommodating the active material layer at various locations within the third region 231c, thereby facilitating the collection of any detached active material layer. For example, within the third region 231c, the plurality of grooves 232 may be spaced apart along the first direction X and also spaced apart along the second direction Y.

[0154] In some embodiments, the plurality of grooves 232 in the first region 231a are arranged in a matrix, and the plurality of grooves 232 in the third region 231c are also arranged in a matrix. The arrangement of the plurality of grooves 232 in the third region 231c can be the same as or different from the arrangement of the plurality of grooves 232 in the first region 231a. When the arrangement of the plurality of grooves 232 in the third region 231c is the same as the arrangement of the plurality of grooves 232 in the first region 231a, processing of the grooves 232 is facilitated.

[0155] In the above solution, the plurality of grooves 232 are arranged in a matrix, which can reasonably utilize the space of the first surface 231 and form a larger space for accommodating the active material layer in the corresponding area, thereby facilitating the collection of the active material layer.

[0156] Referring to FIG. 5 , according to some embodiments of the present application, the groove 232 is a blind hole.

[0157] The blind hole is a hole that goes from the surface layer to the inner layer but does not penetrate the substrate. The groove 232 is a blind hole, that is, the groove 232 is formed by the first surface 231 being recessed toward the first wall 210 but does not penetrate the first insulating member 23 .

[0158] The shape of the blind hole can be various, for example, circular, square, other polygonal, etc.

[0159] In the above solution, the groove 232 is a blind hole, which can reduce the risk of the active material layer penetrating the first insulating member 23 and contacting the housing 21 .

[0160] 8 and 9 , according to some embodiments of the present application, the groove 232 is in a strip shape, and the length direction of the groove 232 is parallel to the first direction X.

[0161] The groove 232 is in a strip shape, that is, the groove 232 extends along the first direction X, and the size of the groove 232 in the first direction X is larger than that in other directions.

[0162] The groove 232 may include a straight segment and two arc segments. The two arc segments are located at two ends of the straight segment in the first direction X. The arc segments may be semicircular.

[0163] In some embodiments, the first region 231a includes multiple grooves 232. Along the first direction X, only one groove 232 is provided in the first region 231a, and the groove 232 extends substantially from one end of the first region 231a to the other end. Along the second direction Y, multiple grooves 232 are spaced apart in the first region 231a. Furthermore, the third region 231c includes multiple grooves 232. Along the first direction X, only one groove 232 is provided in the third region 231c, and the groove 232 extends substantially from one end of the third region 231c to the other end. Along the second direction Y, multiple grooves 232 are spaced apart in the third region 231c.

[0164] In the above solution, the groove 232 is in the shape of an elongated strip and is parallel to the first direction X, which is convenient for processing and manufacturing and can accommodate more active material layers and electrolytes.

[0165] Please refer to Figure 10, which is a partial enlarged view of point B in Figure 9. According to some embodiments of the present application, the width of the groove 232 is W, which satisfies 0.2 mm ≤ W ≤ 5 mm.

[0166] The width of the groove 232 refers to the dimension of the groove 232 in a direction perpendicular to the length of the groove 232. For example, the width of the groove 232 is parallel to the second direction Y, and the width of the groove 232 refers to the dimension of the groove 232 in the second direction Y.

[0167] Optionally, W can be, but is not limited to, 0.2mm, 0.25mm, 0.3mm, 0.4mm, 0.5mm, 0.75mm, 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm, 2.25mm, 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.25mm, 4.5mm, 4.75mm, 5mm, etc.

[0168] In the above solution, the width W of the groove 232 satisfies the above relationship (0.2mm≤W≤5mm). On the one hand, the processing and manufacturing difficulty is relatively low. On the other hand, it can reduce the risk of the opening of the groove 232 scratching the isolation membrane and the active material layer and causing damage to the electrode assembly 22.

[0169] According to some embodiments of the present application, 2mm≤W≤3.5mm.

[0170] Optionally, W can be, but is not limited to, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, etc.

[0171] In the above solution, compared with W<2mm, when W≥2mm, it is easy to process and manufacture, and the processing and manufacturing difficulty is lower; compared with W>3.5mm, when W≤3.5mm, the opening of the groove 232 is not easy to scratch the isolation membrane and the active material layer, reducing the risk of damage to the electrode assembly 22.

[0172] Referring to FIG. 3 , according to some embodiments of the present application, the first direction X is parallel to the length direction of the first wall 210 .

[0173] The first direction X is parallel to the length direction of the first wall 210, and the width direction of the first insulating member 23 can be parallel to the width direction of the first wall 210, so that in the thickness direction Z of the first wall 210, the first insulating member 23 can have a larger overlapping area with the first wall 210, thereby making the first insulating member 23 have a larger contact area with the electrode assembly 22.

[0174] In some embodiments, the first insulating member 23 and the first wall 210 may both be rectangular plate-shaped structures.

[0175] In the above solution, the first direction X is parallel to the length direction of the first wall 210, so that the first insulating member 23 can have a larger area and can have a larger overlapping area with the electrode assembly 22 to accommodate active material layers detached from different positions.

[0176] 3 and 4 , according to some embodiments of the present application, the battery cell 20 further includes a second insulating member 25 , which is disposed between the first insulating member 23 and the first wall 210 . The first insulating member 23 is configured to support the electrode assembly 22 .

[0177] The second insulating member 25 can be arranged on the inner surface of the first wall 210. Along the thickness direction Z of the first wall 210, the opposite ends of the first insulating member 23 can respectively contact the second insulating member 25 and the electrode assembly 22 to support the electrode assembly 22 and limit the movement of the electrode assembly 22 in the thickness direction Z of the first wall 210.

[0178] In some embodiments, the second insulating member 25 can be connected to the inner surface of the first wall 210 by bonding, clamping or other connection methods.

[0179] In some embodiments, along the thickness direction Z of the first wall 210, the projection of the first insulating member 23 can completely fall into the second insulating member 25. Since the second insulating member 25 is arranged between the first insulating member 23 and the first wall 210, the second insulating member 25 can receive the active material layer that passes over the first insulating member 23 to reduce the risk of contact between the active material layer and the first wall 210.

[0180] In some embodiments, when the pressure relief mechanism 24 is arranged on the first wall 210 and the second insulating member 25 is arranged on the inner surface of the first wall 210, the corresponding position of the first insulating member 23 and the pressure relief mechanism 24 (the second area 231b) can be provided with a through hole 233 to facilitate the gas to pass through the first insulating member 23 and move toward the pressure relief mechanism 24. In this case, no other through holes are provided at the position of the second insulating member 25 corresponding to the through hole 233, so that the position of the second insulating member 25 corresponding to the through hole 233 can block the active material layer from moving toward the pressure relief mechanism 24.

[0181] In the above solution, the first insulating member 23 can provide a good supporting effect on the electrode assembly 22. When used in conjunction with the second insulating member 25, it can reduce the risk of internal short circuit in the battery cell 20 and the risk of contact between the active material layer and the shell 21.

[0182] Please refer to Figures 3 and 4, and further to Figure 11, which is a schematic diagram of the connection between electrode terminals and tabs provided in some embodiments of the present application. According to some embodiments of the present application, the battery cell 20 also includes an electrode terminal 26, which is disposed on the first wall 210 and extends through the second insulating member 25. The electrode assembly 22 includes a main body 221 and a tab 222 extending from the main body 221. The tab 222 bypasses the first insulating member 23 and is electrically connected to the electrode terminal 26.

[0183] The electrode terminal 26 is disposed on the first wall 210. The first wall 210 is provided with a through-hole for the electrode terminal 26 to pass through. A portion of the electrode terminal 26 is disposed within the through-hole to facilitate electrical connection between the electrode terminal 26 and the tab 222, thereby enabling the electrode terminal 26 to input or output electrical energy from the battery cell 20. The electrode terminal 26 can be made of a variety of materials, such as copper, iron, aluminum, steel, and aluminum alloy.

[0184] Exemplarily, there are two electrode terminals 26 , both of which are mounted on the first wall 210 , and the two electrode terminals 26 are a positive electrode terminal and a negative electrode terminal, respectively.

[0185] The tab 222 serves to output or input electrical energy from the electrode assembly 22. Exemplarily, the electrode assembly 22 has two tabs 222, which are a positive tab and a negative tab, respectively. The positive tab is electrically connected to the positive electrode terminal, and the negative tab is electrically connected to the negative electrode terminal.

[0186] Illustratively, the tab 222 can protrude from one end of the main body 221 toward the first insulating member 23, one end of the tab 222 is connected to the main body 221, and the other end of the tab 222 bypasses the first insulating member 23 along the second direction Y (the width direction of the first insulating member 23) and is electrically connected to the electrode terminal 26.

[0187] The tab 222 can be directly connected to the electrode terminal 26 by welding, conductive adhesive bonding, etc., or an adapter can be provided, and the tab 222 can be connected to the electrode terminal 26 through the adapter.

[0188] In the above solution, the electrode terminal 26 is provided on the first wall 210 to form the output electrode of the battery cell 20 , and the tab 222 of the electrode assembly 22 bypasses the first insulating member 23 and is connected to the electrode terminal 26 , so that the electrode assembly 22 is electrically connected to the electrode terminal 26 .

[0189] 3 and 11 , according to some embodiments of the present application, the battery cell 20 further includes a transition piece 27 disposed between the second insulating piece 25 and the first insulating piece 23 , and the transition piece 27 connects the electrode terminal 26 and the tab 222 .

[0190] The adapter 27 connects the tab 222 and the electrode terminal 26 to achieve electrical connection between the tab 222 and the electrode terminal 26. The adapter 27 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0191] Exemplarily, there are two adapters 27, and the two adapters 27 correspond one-to-one to the two electrode terminals 26, that is, the positive electrode tab of the electrode assembly 22 is connected to the positive electrode terminal through one adapter 27, and the negative electrode tab of the electrode assembly 22 is connected to the negative electrode terminal through another adapter 27.

[0192] In the above solution, the battery cell 20 is provided with an adapter 27 so that the tab 222 and the electrode terminal 26 are electrically connected through the adapter 27 .

[0193] Please refer to Figures 3, 4, 6 and 8. According to some embodiments of the present application, the battery cell 20 also includes an electrode terminal 26, which is arranged on the first wall 210. The electrode assembly 22 includes a main body 221 and a tab 222 extending from the main body 221. The tab 222 is electrically connected to the electrode terminal 26 by bypassing the first insulating member 23. The first surface 231 includes a main body area 234 and an avoidance area 235. The main body area 234 is configured to support the main body 221, and the avoidance area 235 is used to avoid the tab 222.

[0194] The body region 234 and the escape region 235 are two regions of the first insulating member 23. The body region 234 has a large overlapping area with the main body 221, and the body region 234 contacts the main body 221, with a large contact area between the body region 234 and the main body 221, to effectively support the electrode assembly 22. The escape region 235 is provided corresponding to the tab 222 of the electrode assembly 22. The area where the tab 222 connects to the main body 221 is located in the escape region 235, thereby reducing the risk of interference between the first insulating member 23 and the tab 222.

[0195] During the assembly process of the battery cell 20, the area where the tab 222 is connected to the main body 221 is located in the avoidance area 235, and the end of the tab 222 away from the main body 221 is bent around the edge of the first insulating member 23 to connect with the electrode terminal 26 located on the side of the first insulating member 23 away from the main body 221.

[0196] In some embodiments, at least the body region 234 of the first surface 231 is provided with a groove 232. Optionally, both the body region 234 and the escape region 235 may be provided with grooves 232 to collect the active material layer. Active material layers that fall off from the electrode assembly 22 can be collected by the grooves 232 on the body region 234 and the escape region 235, thereby reducing the probability of the active material layer moving into contact with the housing 21.

[0197] In the above solution, the main body area 234 contacts the main body 221 and supports the main body 221, so that the electrode assembly 22 is effectively supported; the avoidance area 235 avoids the pole ear 222 to reduce the interference between the first insulating member 23 and the pole ear 222, thereby reducing the assembly space.

[0198] Please refer to FIG12 , which is a schematic diagram of the assembly of the isolation membrane and the groove according to some embodiments of the present application. According to some embodiments of the present application, the electrode assembly 22 includes an isolation membrane 223 , one end of which extends into the groove 232 .

[0199] To reduce the risk of a short circuit caused by contact between the positive and negative electrode sheets, the separator 223 is typically larger than the positive and negative electrode sheets. At the end of the electrode assembly 22 facing the first surface 231, the separator 223 can extend relative to the positive and negative electrode sheets toward the first surface 231, so that the portion of the separator 223 facing the first surface 231 can extend into the groove 232. Because the separator 223 has a porous structure, after the separator 223 comes into contact with the electrolyte in the groove 232, combined with capillary action, the electrolyte can move along the separator 223 to between the positive and negative electrode sheets, thereby participating in the electrochemical reaction of the electrode assembly 22.

[0200] In the above solution, one end of the isolation membrane 223 extends into the groove 232 and can absorb the electrolyte contained in the groove 232 by capillary action.

[0201] According to some embodiments of the present application, along the thickness direction Z of the first wall 210 , the projection of the electrode assembly 22 completely falls within the first surface 231 .

[0202] The thickness direction Z of the first wall 210 is parallel to the arrangement direction of the first insulating member 23 and the electrode assembly 22. That is, along the direction from the electrode assembly 22 to the first insulating member 23, the projection of the electrode assembly 22 on the first insulating member 23 completely falls within the first surface 231. In other words, along the thickness direction Z of the first wall 210, the first surface 231 of the first insulating member 23 can completely cover the end of the electrode assembly 22 facing the first insulating member 23.

[0203] In the above solution, the projection of the electrode assembly 22 completely falls within the first surface 231, which helps increase the contact area between the first insulating member 23 and the electrode assembly 22, thereby increasing the force-bearing area of ​​the electrode assembly 22 and alleviating the problem of decarburization of the electrode assembly 22. Furthermore, even if decarburization of the electrode assembly 22 occurs, the first insulating member 23 can effectively receive and absorb the detached carbon powder, effectively reducing the probability of carbon powder landing on the housing 21, the pressure relief mechanism 24, or other components. This reduces the possibility of abnormalities such as corrosion of the housing 21 and blockage of the pressure relief mechanism 24, effectively extending the service life of the battery cell 20 and the battery life.

[0204] Referring to FIG. 3 , according to some embodiments of the present application, the housing 21 includes a shell 211 and an end cover 212 . The shell 211 has an opening, and the end cover 212 covers the opening. The end cover 212 is a first wall 210 .

[0205] The housing 211 and the end cap 212 together form a closed cavity for housing the electrode assembly 22. When the battery cell 20 is inverted for use, the end of the battery cell 20 with the electrode terminal 26 is positioned toward the ground or downward in the thickness direction Z of the first wall 210, such that the first wall 210 is oriented in an up-down direction. The end cap 212 is located on the side of the housing 211 that faces the bottom of the case. The electrode terminal 26 is disposed on the end cap 212. The first insulating member 23 is disposed between the end cap 212 and the electrode assembly 22 to support the electrode assembly 22.

[0206] In the above solution, the end cover 212 is the first wall 210 , which facilitates the assembly of the first insulating member 23 and the first wall 210 .

[0207] According to some embodiments of the present application, an embodiment of the present application further provides a battery 100, comprising a battery cell 20 as provided in any of the above embodiments.

[0208] According to some embodiments of the present application, an electrical device is further provided, comprising a battery cell 20 or a battery 100 as provided in any of the above embodiments, wherein the battery cell 20 or the battery 100 is used to provide electrical energy.

[0209] The power-consuming device may be any of the above-mentioned devices or systems for supplying power to the battery cell 20 or the battery 100 .

[0210] According to some embodiments of the present application, referring to Figures 3 to 12 , a battery cell 20 is provided. The battery cell 20 is a rectangular parallelepiped. The battery cell 20 includes a housing 21 , an electrode assembly 22 , a first insulating member 23 , a pressure relief mechanism 24 , a second insulating member 25 , an electrode terminal 26 , and an adapter 27 .

[0211] The housing 21 includes a shell 211 and an end cap 212 . The shell 211 has an opening. The end cap 212 covers the opening. The end cap 212 is a first wall 210 . The pressure relief mechanism 24 and the electrode terminal 26 are both disposed on the first wall 210 .

[0212] The electrode assembly 22 is disposed in the outer shell 21. The electrode assembly 22 includes a main body 221 and a tab 222 extending from the main body 221. The second insulating member 25 is disposed on the inner surface of the first wall 210. The first insulating member 23 is disposed in the outer shell 21, and the second insulating member 25 is located between the first wall 210 and the first insulating member 23. The first insulating member 23 is in contact with the electrode assembly 22. The first insulating member 23 has a first surface 231 facing the electrode assembly 22. The first surface 231 is provided with a groove 232. The opening of the groove 232 faces the electrode assembly 22, and the groove 232 is a blind hole. The first insulating member 23 is a rectangular plate. The length direction of the first insulating member 23 is parallel to the length direction of the first wall 210, and the width direction of the first insulating member 23 is parallel to the width direction of the first wall 210. The first surface 231 includes a first region 231a, a second region 231b, and a third region 231c, arranged sequentially along the first direction X. The second region 231b corresponds to the pressure relief mechanism 24. Both the first region 231a and the third region 231c are provided with grooves 232. Multiple grooves 232 are arranged in a matrix within the first region 231a, and multiple grooves 232 are arranged in a matrix within the third region 231c. An adapter 27 is disposed between the first insulating member 23 and the second insulating member 25. The electrode terminal 26 is connected to the adapter 27. The tab 222 bypasses the first insulating member 23 and connects to the adapter 27, thereby achieving electrical connection between the electrode terminal 26 and the tab 222 through the adapter 27. Along the thickness direction Z of the first wall 210, the projection of the electrode assembly 22 completely falls within the first surface 231.

[0213] In some embodiments, along the first direction X, a plurality of grooves 232 are disposed in the first region 231 a , and the plurality of grooves 232 are spaced apart along the first direction X; a plurality of grooves 232 are disposed in the third region 231 c , and the plurality of grooves 232 are spaced apart along the first direction X. The grooves 232 are circular blind holes.

[0214] In some embodiments, along the first direction X, a groove 232 is defined within the first region 231a, extending from one end of the first region 231a to the other. A groove 232 is defined within the third region 231c, extending from one end of the third region 231c to the other. The groove 232 is elongated, and one end of the separator 223 of the electrode assembly 22 extends into the groove 232, allowing the separator 223 to absorb electrolyte within the groove 232.

[0215] According to the battery cell 20 of the embodiment of the present application, when the battery cell 20 is used inverted, the first insulating member 23 is located below the electrode assembly 22. The first insulating member 23 is configured to support the electrode assembly 22. By providing a groove 232 on the first surface 231 of the first insulating member 23 facing the electrode assembly 22, the groove 232 can accommodate the active material layer that falls off the electrode assembly 22, so as to constrain the fallen active material layer, reduce the probability of the active material layer contacting the outer shell 21, and thereby reduce the risk of corrosion and leakage of the outer shell 21, so that the battery cell 20 has higher reliability.

[0216] 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 including a first wall; An electrode assembly, disposed inside the housing; A first insulating member is disposed in the housing and between the electrode assembly and the first wall, the first insulating member being in contact with the electrode assembly; The first insulating member has a first surface facing the electrode assembly, and the first surface is provided with a groove.

2. The battery cell according to claim 1, characterized in that: In the thickness direction of the first wall, the groove does not penetrate the first insulating member.

3. The battery cell according to claim 2, characterized in that: In the thickness direction of the first wall, the depth of the groove is H1, which satisfies 0.2 mm ≤ H1 ≤ 4 mm.

4. The battery cell according to claim 3, characterized in that: 1mm≤H1≤2mm.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The first insulating member is a plate-shaped structure.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The battery cell also includes a pressure relief mechanism, which is arranged on the first wall. The first surface includes a first area, a second area and a third area arranged in sequence along a first direction. The second area is arranged corresponding to the pressure relief mechanism. The first area and the third area are both provided with the groove. The first direction intersects with the thickness direction of the first wall.

7. The battery cell according to claim 6, characterized in that: The first area is provided with a plurality of the grooves, and the plurality of the grooves are arranged in a matrix; and / or The third area is provided with a plurality of the grooves, and the plurality of the grooves are arranged in a matrix.

8. The battery cell according to claim 7, characterized in that: The groove is a blind hole.

9. The battery cell according to any one of claims 6 to 8, characterized in that: The groove is in the shape of an elongated strip, and the length direction of the groove is parallel to the first direction.

10. The battery cell according to claim 9, characterized in that: The width of the groove is W, which satisfies 0.2mm≤W≤5mm.

11. The battery cell according to claim 10, characterized in that: 2mm≤W≤3.5mm.

12. The battery cell according to any one of claims 6 to 11, characterized in that: The first direction is parallel to the length direction of the first wall.

13. The battery cell according to any one of claims 6 to 12, characterized in that: The second area is provided with a through hole.

14. The battery cell according to any one of claims 1 to 13, characterized in that: The battery cell further includes a second insulating member disposed between the first insulating member and the first wall, the first insulating member being configured to support the electrode assembly.

15. The battery cell according to claim 14, characterized in that: The battery cell further includes an electrode terminal, which is disposed on the first wall and passes through the second insulating member. The electrode assembly includes a main body and a tab extending from the main body, and the tab bypasses the first insulating member and is electrically connected to the electrode terminal.

16. The battery cell according to claim 15, characterized in that: The battery cell further includes a transition piece disposed between the second insulating piece and the first insulating piece, wherein the transition piece connects the electrode terminal and the tab.

17. The battery cell according to any one of claims 1 to 16, characterized in that: The battery cell also includes an electrode terminal, which is arranged on the first wall. The electrode assembly includes a main body and a pole ear extending from the main body, and the pole ear bypasses the first insulating member to be electrically connected to the electrode terminal. The first surface includes a main body area and an avoidance area, the main body area is configured to support the main body, and the avoidance area is used to avoid the pole ear.

18. The battery cell according to any one of claims 1 to 17, characterized in that: The electrode assembly includes a separation membrane, one end of which extends into the groove.

19. The battery cell according to any one of claims 1 to 18, characterized in that: Along the thickness direction of the first wall, the projection of the electrode assembly completely falls into the first surface.

20. The battery cell according to any one of claims 1 to 19, characterized in that: The housing comprises a shell and an end cover, the shell has an opening, the end cover covers the opening, and the end cover is the first wall.

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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