Battery monomer, battery and electric device

Abstract

The invention provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly and an insulating part, the housing includes a first wall. The electrode assembly is contained in the shell, and the insulating part wraps the outer side of the shell and covers the outer surface, away from the electrode assembly, of the first wall in the thickness direction of the first wall. The insulating part is provided with a first hollow area, the first hollow area is located on the side, away from the electrode assembly, of the first wall in the thickness direction of the first wall, a first exposed area is formed in the position, corresponding to the first hollow area, of the first wall, and the first exposed area is used for being connected with the pressing strip. When the battery monomers with the structure are assembled into a group to form the battery, the pressing strip can be directly connected with the shell, so that the phenomenon that the shell and the pressing strip are indirectly connected through the insulating part and are easy to fall off is reduced, and the connection strength can be improved, so that the assembly quality and the use stability of the battery with the battery monomers are favorably improved.

Description

Battery cells, batteries and electrical devices Technical Field

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

[0002] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source for electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, demand for power battery products is also growing. Batteries are composed of multiple stacked battery cells. However, existing batteries often suffer from unstable assembly after multiple battery cells are assembled into groups. Furthermore, the battery cells are prone to shaking within the battery during use, resulting in poor assembly quality and operational stability.

[0003] Summary of the Invention

[0004] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the assembly quality and usage stability of the battery.

[0005] In a first aspect, an embodiment of the present application provides a battery cell comprising a shell, an electrode assembly and an insulating member; the shell comprises a first wall; the electrode assembly is accommodated in the shell; the insulating member is wrapped around the outside of the shell and covers the outer surface of the first wall facing away from the electrode assembly in the thickness direction of the first wall; wherein the insulating member is provided with a first hollow area, and along the thickness direction of the first wall, the first hollow area is located on the side of the first wall facing away from the electrode assembly, and the first wall forms a first exposed area at a position corresponding to the first hollow area, and the first exposed area is used to connect with the pressure strip.

[0006] In the above technical solution, the outer surface of the shell is covered with an insulating member, so that the insulating member can insulate and isolate the shell of the battery cell from the external environment, so as to reduce the risk of short circuit of the battery cell during use. By setting a first hollow area at a position on the side of the insulating member corresponding to the first wall, a first exposed area is formed on the first wall of the shell, so that the battery cell can be connected to the pressure strip through the first exposed area, so that when the battery cells are assembled into groups to form a battery, the pressure strip can be directly connected to the shell, so that the shell does not need to be indirectly connected to the pressure strip through the insulating member, which is beneficial to reducing the influence of the insulating member on the connection effect between the battery cell and the pressure strip, and can effectively improve the connection strength, so as to reduce the phenomenon that the shell and the pressure strip are easily detached due to the indirect connection through the insulating member, thereby achieving the insulation effect between the battery cell and the external environment while improving the assembly quality of the battery cells when they are grouped, which is beneficial to improving the assembly quality and use stability of the battery with such battery cells.

[0007] In some embodiments, the area of ​​the first exposed area is S, satisfying S≥50mm 2 .

[0008] In the above technical solution, the area of ​​the first exposed area of ​​the first wall connected to the pressure strip is set to be greater than or equal to 50mm 2 , so that the first wall has sufficient area to connect with the pressure strip, which is beneficial to increase the connection area between the first wall and the pressure strip, thereby improving the connection strength.

[0009] In some embodiments, a minimum distance between the first exposed area and the edge of the first wall is D1, which satisfies 1 mm ≤ D1 ≤ 5 mm.

[0010] In the above technical solution, by setting the minimum distance between the first exposed area and the edge of the first wall to 1mm to 5mm, the minimum distance between the first hollow area set on the insulating member and the edge of the first wall is made to be 1mm to 5mm. This can, on the one hand, alleviate the phenomenon that the manufacturing difficulty of the first hollow area is greater due to the small distance between the first hollow area and the edge of the first wall, thereby reducing the manufacturing difficulty of the battery cell. On the other hand, it can alleviate the phenomenon that the insulating member covers the first wall too much due to the large distance between the first hollow area and the edge of the first wall, resulting in the area of ​​the first exposed area formed on the first wall being too small.

[0011] In some embodiments, the shell also includes a second wall and a side wall. Along the thickness direction of the first wall, the second wall is arranged opposite to the first wall, and the side wall is arranged around the first wall and the second wall; the insulating member includes a first insulating member and a second insulating member that are separately arranged. The first insulating member covers the outer surface of the first wall facing away from the electrode assembly, and the second insulating member covers the outer surface of the second wall facing away from the electrode assembly and the outer surface of the side wall facing away from the electrode assembly.

[0012] In the above technical solution, by setting the insulator as a first insulating part and a second insulating part that are separately set, the first insulating part is a structure covering the first wall, and the second insulating part is a structure covering the side wall and the second wall, so that the first insulating part and the second insulating part of the insulating part are respectively arranged corresponding to the first wall of the shell and the second wall and the side wall of the shell, which is conducive to reducing the difficulty of assembly between the insulating part and the shell.

[0013] In some embodiments, the first hollow area is disposed on the first insulating member.

[0014] In the above technical solution, a first hollow area is provided on the first insulating member alone to form a first exposed area on the first wall. This insulating member has a simple structure and is easy to process and manufacture. The first hollow area and the second insulating member do not affect each other, which helps to reduce the difficulty of assembling the battery cell.

[0015] In some embodiments, the second insulating member has a flange portion, which is arranged along the circumference of the first wall and located on the side of the first wall away from the electrode assembly. The flange portion and the edge of the first insulating member together enclose the first hollow area.

[0016] In the above technical solution, the second insulating member has a flange portion arranged on the first wall along the circumference of the first wall and located at the edge of the first wall, so that the edge of the first insulating member arranged on the first wall and part of the flange portion together enclose a first hollow area to form a first exposed area on the first wall. On the one hand, a battery cell adopting this structure does not need to set the first insulating member to a structure with a through hole, which is beneficial to improving the overall structural strength of the first insulating member. On the other hand, it is beneficial to control the size and dimensions of the first hollow area.

[0017] In some embodiments, along the thickness direction of the first wall, a portion of the flange portion is located between the first wall and the first insulating member.

[0018] In the above technical solution, by arranging part of the flange portion of the second insulating member between the first wall and the first insulating member in the thickness direction of the first wall, the first insulating member can press part of the flange portion onto the first wall, which is beneficial to improving the connection stability of the flange portion of the second insulating member arranged on the first wall, so as to reduce the phenomenon of the flange portion falling off.

[0019] In some embodiments, the first insulating member and the flange portion together enclose two first hollow areas, and along a first direction, the two first hollow areas are respectively located at two ends of the first insulating member, and the first direction is perpendicular to the thickness direction of the first wall.

[0020] In the above technical solution, two hollow areas are formed by enclosing the two ends of the first insulating member in the first direction with the flange portion respectively, so that two first exposed areas arranged along the first direction are formed on the first wall, and the two first exposed areas are respectively located at the two ends of the first insulating member. On the one hand, the first wall can be connected to the molding through the two first exposed areas, which is beneficial to further improve the connection strength between the shell and the molding. On the other hand, it can reduce the interference effect between the first exposed area and the molding when it is connected to the first insulating member, which is beneficial to reduce the difficulty of assembly between the battery cell and the molding.

[0021] In some embodiments, the flange portion includes a first segment, a second segment, a third segment and a fourth segment connected in sequence along the circumference of the first wall; along the first direction, the first segment is opposite to the third segment, and along the second direction, the second segment is opposite to the fourth segment, and the first direction, the second direction and the thickness direction of the first wall are perpendicular to each other; the first insulating member is located between the first segment and the third segment in the first direction, and the first segment, part of the second segment, part of the fourth segment and one end of the first insulating member in the first direction together enclose a first hollow area, and the third segment, part of the second segment, part of the fourth segment and the other end of the first insulating member in the first direction together enclose another first hollow area.

[0022] In the above technical solution, the flange portion is provided with a first section, a second section, a third section and a fourth section which are connected in sequence along the circumferential direction of the first wall, and the first section and the third section are arranged opposite to each other along the first direction, and the second section and the fourth section are arranged opposite to each other along the second direction, so that the flange portion is a rectangular ring structure, and thus by arranging the first insulating member between the first section and the third section in the first direction, the edges of the two ends of the first insulating member in the first direction can form two first hollow areas with the flange portion respectively, and the structure is simple and easy to implement.

[0023] In some embodiments, the second wall and the side wall are an integrally formed structure, and along the thickness direction of the first wall, one end of the side wall is connected to the second wall, and the other end is enclosed to form an opening, and the first wall is an end cover that closes the opening.

[0024] In the above technical solution, the second wall and the side wall of the shell are set to an integrally formed structure, and an opening is formed at one end of the side wall away from the second wall, and the first wall closes the opening, so that the shell is assembled from two parts. The shell with this structure makes it easy to cover the second insulating part of the insulating part on the outer surface of the integrally formed second wall and side wall, which helps to reduce the difficulty of assembling the battery cell.

[0025] In some embodiments, the battery cell further includes an electrode terminal; the electrode terminal is disposed on the first wall and electrically connected to the electrode assembly; wherein the insulating member is provided with a mounting hole, the electrode terminal is passed through the mounting hole, and the mounting hole is spaced apart from the first hollow area.

[0026] In the above technical solution, the electrode terminal is arranged on the first wall, and a mounting hole for the electrode terminal to pass through is provided at the position of the insulating member corresponding to the electrode terminal. By spacing the mounting hole and the first hollow area, on the one hand, the first exposed area formed by the first wall corresponding to the first hollow area can be spaced apart from the electrode terminal to reduce the interference between the first exposed area and the electrode terminal when it is connected to an external component. On the other hand, the insulating member is not connected to each other between the first hollow area and the mounting hole, so that the insulating member can be sleeved on the electrode terminal to improve the connection reliability of the insulating member.

[0027] In some embodiments, the minimum distance between the first hollow area and the mounting hole is D2, satisfying D2 ≥ 0.5 mm.

[0028] In the above technical solution, by setting the minimum distance between the first hollow area and the mounting hole to be greater than or equal to 0.5 mm, the minimum size of the portion of the insulating part between the first hollow area and the mounting hole is greater than or equal to 0.5 mm, thereby alleviating the risk of breakage due to the small size of the portion of the insulating part between the first hollow area and the mounting hole.

[0029] In some embodiments, the insulating member is provided with two first hollow areas arranged along the first direction to form two first exposed areas arranged along the first direction on the first wall, and the first direction is perpendicular to the thickness direction of the first wall; wherein, the first wall is provided with two electrode terminals, the two electrode terminals are arranged along the first direction, and the two electrode terminals are located between the two first hollow areas, and along the first direction, the minimum distance between each first hollow area and the adjacent mounting hole is D2.

[0030] In the above technical solution, the insulating member is provided with two first hollow areas arranged along the first direction, and the first wall is provided with two electrode terminals arranged along the first direction and both located between the two first hollow areas, so that the minimum distance between the first hollow area and the adjacent mounting hole is D2. By setting the minimum size of D2, the risk of the portion of the insulating member located in the first exposed area and the electrode terminal in the first direction breaking during use can be reduced.

[0031] In some embodiments, the insulating member is provided with two first hollow areas arranged along a first direction to form two first exposed areas arranged along the first direction on the first wall, and the first direction is perpendicular to the thickness direction of the first wall; along the first direction, the electrode terminal is located between the two first exposed areas.

[0032] In the above technical solution, two first hollow areas arranged along the first direction are provided on the insulating member, so that two first exposed areas arranged along the first direction are formed on the first wall, and the electrode terminal is provided between the two first exposed areas. Therefore, on the one hand, the connection strength between the first wall and the pressure strip can be further improved by the two first exposed areas, and on the other hand, the difficulty of connecting the battery cell with the pressure strip during the grouping process can be reduced by providing the two first exposed areas on both sides of the electrode terminal.

[0033] In some embodiments, the shell also includes a second wall, which is arranged opposite to the first wall along the thickness direction of the first wall; the battery cell also includes two electrode terminals, which are respectively arranged on the first wall and the second wall, and both of the electrode terminals are electrically connected to the electrode assembly.

[0034] In the above technical solution, by arranging the two electrode terminals of the battery cell on the first and second opposite walls of the housing respectively, the first wall can have more space to form the first exposed area, and the difficulty of arranging the first hollow area of ​​the insulating member can be reduced.

[0035] In some embodiments, the shell also includes a second wall, which is arranged opposite to the first wall along the thickness direction of the first wall; the insulating member is also provided with a second hollow area, which is located on the side of the second wall away from the electrode assembly along the thickness direction of the first wall, and the second wall forms a second exposed area at a position corresponding to the second hollow area, and the second exposed area is used to connect to the box body.

[0036] In the above technical solution, the first hollow area and the second hollow area are distributed and arranged at positions on both sides of the insulating part corresponding to the first wall and the second wall, that is, the insulating part is respectively provided with the first hollow area and the second hollow area on the opposite sides of the shell along the thickness direction of the first wall, so that the first exposed area and the second exposed area are respectively formed on the first wall and the second wall of the shell, so that the first wall and the second wall of the shell can be connected to the pressure strip and the box body through the first exposed area and the second exposed area respectively, thereby improving the structural stability of the battery cell assembled into the box body, and enabling the shell to be directly connected to the box body, so as to reduce the phenomenon that the shell and the box body are easily detached due to indirect connection through the insulating part.

[0037] In a second aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0038] In some embodiments, the battery further includes a box and a pressure strip, the pressure strip and the battery cell are both accommodated in the box, and the first exposed area is bonded to the pressure strip.

[0039] In the above technical solution, the battery is provided with a box body and a molding strip, and the battery cell is fastened to the box body of the battery by bonding the molding strip to the first exposed area of ​​the outer shell of the battery cell. The battery adopts this structure so that the outer shell of the battery cell can be directly bonded to the molding strip, so that the outer shell does not need to be indirectly connected to the molding strip through an insulating member, which is beneficial to reducing the influence of the insulating member on the bonding effect between the battery cell and the molding strip, and can effectively improve the bonding strength to reduce the phenomenon of easy detachment between the outer shell and the molding strip due to indirect bonding through the insulating member, thereby improving the structural stability of the battery cell assembled into the box body, reducing the risk of shaking or detachment of the battery cell during use, and thus improving the assembly quality and use stability of the battery.

[0040] In some embodiments, the battery includes a plurality of battery cells, and the press strip is bonded to the first exposed areas of the plurality of battery cells.

[0041] In the above technical solution, multiple battery cells are arranged in the box, and the pressure strips are bonded to the first exposed areas of the multiple battery cells, so that the multiple battery cells can be connected into a whole through the pressure strips, which is beneficial to improve the structural strength and structural stability of the multiple battery cells in the box, and thus can effectively improve the stability of battery use.

[0042] In some embodiments, the shell also includes a second wall, which is arranged opposite to the first wall along the thickness direction of the first wall; the insulating member is also provided with a second hollow area, which is located on the side of the second wall away from the electrode assembly along the thickness direction of the first wall, and the second wall forms a second exposed area at a position corresponding to the second hollow area, and the second exposed area is bonded to the box body.

[0043] In the above technical solution, the second exposed area of ​​the battery cell shell is bonded to the box to further fasten the battery cell to the box. The battery using this structure enables the battery cell shell to be directly bonded to the box, so that the shell does not need to be indirectly connected to the box through an insulating member, which is beneficial to reduce the impact of the insulating member on the bonding effect between the battery cell and the box, and can effectively improve the bonding strength, thereby improving the structural stability of the battery cell assembled into the box, reducing the risk of the battery cell shaking or detaching during use, and thereby improving the assembly quality and use stability of the battery.

[0044] In a third aspect, an embodiment of the present application further provides an electrical device comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] 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 paying any creative work.

[0046] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0047] FIG2 is a cross-sectional view of a battery provided in some embodiments of the present application;

[0048] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0049] FIG4 is a top view of a battery cell provided in some embodiments of the present application;

[0050] FIG5 is a schematic structural diagram of a battery cell (after removing the insulating member) provided in some embodiments of the present application;

[0051] FIG6 is a schematic structural diagram of a first insulating member of a battery cell provided in some embodiments of the present application;

[0052] FIG7 is a schematic structural diagram of a battery cell provided in some other embodiments of the present application;

[0053] FIG8 is a top view of a battery cell provided in some other embodiments of the present application;

[0054] FIG9 is a schematic structural diagram of a battery cell (after removing the first insulating member) provided in some other embodiments of the present application;

[0055] FIG10 is a schematic structural diagram of a first insulating member of a battery cell provided in yet other embodiments of the present application;

[0056] FIG11 is a bottom view of a battery cell provided in some embodiments of the present application.

[0057] Icons: 1000 - vehicle; 100 - battery; 10 - housing; 11 - first housing body; 12 - second housing body; 20 - battery cell; 21 - housing; 211 - first wall; 2111 - first exposed area; 212 - second wall; 2121 - second exposed area; 213 - side wall; 2131 - opening; 22 - electrode assembly; 23 - insulator; 231 - first hollow area; 232 - avoidance; 233 -first insulating member; 234-second insulating member; 2341-flanged portion; 2341a-first section; 2341b-second section; 2341c-third section; 2341d-fourth section; 235-mounting hole; 236-second hollow area; 24-pressure relief mechanism; 25-electrode terminal; 30-pressing strip; 200-controller; 300-motor; X-thickness direction of the first wall; Y-first direction; Z-second direction. DETAILED DESCRIPTION

[0058] 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 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.

[0059] 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 for the purpose of describing specific embodiments only 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.

[0060] 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.

[0061] 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.

[0062] The term "and / or" in this application simply describes a relationship 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, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0063] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0064] The term "plurality" used in this application refers to two or more (including two).

[0065] 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.

[0066] The battery cells can be 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, etc., which are not limited in the embodiments of the present application.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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 or stainless steel with a silver surface treatment, 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.).

[0071] 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 traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0072] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0073] As an example, the negative electrode current collector can be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper 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.).

[0074] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0075] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0076] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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, and lithium titanate.

[0077] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0078] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0079] 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.

[0080] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0081] 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.

[0082] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0083] 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.

[0084] In some embodiments, the electrode assembly is a laminate structure.

[0085] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0086] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0087] 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.

[0088] 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 this application.

[0089] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0094] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability and low self-discharge coefficient. They are an important part of the development of new energy today.

[0095] For general battery cells, the outer shell of the battery cell usually includes a shell and an end cover, and the end cover is covered with the opening of the shell. In order to facilitate the assembly of the battery cell, the electrode terminal is usually assembled to the end cover of the battery cell, so that when the end cover is covered with the shell, the electrode terminal, the current collecting member and the tab can be stacked and welded to each other first to realize the electrical connection between the electrode terminal and the electrode assembly, so that the electrode terminal is used as the output pole of the battery cell to realize the input or output of the electrical energy of the battery cell, and finally the end cover is connected to the shell.

[0096] The inventors discovered that a battery is usually provided with a plurality of battery cells inside, and the plurality of battery cells are arranged in groups in the battery box. In order to reduce the risk of short circuit between the plurality of battery cells, a blue film is usually covered on the outside of the shell of the shell, and a top cover patch is provided on the end cover of the shell to achieve insulation isolation between the battery cell and other battery cells. When the plurality of battery cells are assembled into groups, in order to reduce the risk of the plurality of battery cells shaking in the box, it is usually necessary to bond the shell of the battery cell to the box, and provide a pressure strip in the battery box, and provide structural adhesive on the end cover of the shell of each battery cell. The pressure strip is bonded to the end covers of the plurality of battery cells to assemble the plurality of battery cells into a whole, thereby increasing the overall structural strength of the plurality of battery cells after being assembled into a group, so as to improve the stability and reliability of the battery. However, when the battery cells of this structure are stacked into groups, the structural adhesive is affected by the top cover patch. The obstruction makes it impossible for the molding and the end cover to be directly bonded, so a top cover patch is provided between the molding and the end cover, so that the molding and the end cover are indirectly bonded through the top cover patch. Since the connection strength between the top cover patch and the end cover cannot meet the connection strength of the molding on the battery cell, the battery cells and the molding will have loose bonding during the assembly of multiple battery cells. There is even the possibility that the top cover patch and the end cover fall off due to the pulling effect of the molding during use, causing the molding to separate from the battery cell, which in turn leads to poor assembly quality and usage stability of the battery.

[0097] Based on the above considerations, in order to solve the problems of poor assembly quality and use stability of the battery, the inventors have designed a battery cell after in-depth research. The battery cell includes a shell, an electrode assembly and an insulating member. The shell includes a first wall. The electrode assembly is accommodated in the shell, and the insulating member is wrapped around the outside of the shell and covers the outer surface of the first wall facing away from the electrode assembly in the thickness direction of the first wall. The insulating member is provided with a first hollow area. Along the thickness direction of the first wall, the first hollow area is located on the side of the first wall facing away from the electrode assembly. The first wall forms a first exposed area at a position corresponding to the first hollow area, and the first exposed area is used to connect with the pressure strip.

[0098] In a battery cell of this structure, the outer surface of the shell is covered with an insulating member, so that the insulating member can insulate and isolate the shell of the battery cell from the external environment, so as to reduce the risk of short circuit of the battery cell during use. By setting a first hollow area at a position on the side of the insulating member corresponding to the first wall, a first exposed area is formed on the first wall of the shell, so that the battery cell can be connected to the pressure strip through the first exposed area, so that when the battery cells are assembled into groups to form a battery, the pressure strip can be directly connected to the shell, so that the shell does not need to be indirectly connected to the pressure strip through the insulating member, which is beneficial to reducing the influence of the insulating member on the connection effect between the battery cell and the pressure strip, and can effectively improve the connection strength, so as to reduce the phenomenon that the shell and the pressure strip are easily detached due to the indirect connection through the insulating member, thereby achieving the insulation effect between the battery cell and the external environment while improving the assembly quality of the battery cells when they are grouped, which is beneficial to improving the assembly quality and use stability of the battery with such battery cells.

[0099] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to construct such electrical devices. This helps alleviate the problem of unstable assembly of multiple battery cells during assembly, thereby improving the assembly quality and operational stability of the battery.

[0100] The present invention provides 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, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, 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.

[0101] 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.

[0102] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The 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. The battery 100 can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the 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 or a power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0103] In some embodiments of the present application, the battery 100 can not only serve as the operating power source or usage power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0104] 2 and 3 , FIG2 is a cross-sectional view of a battery 100 according to some embodiments of the present invention, and FIG3 is a schematic structural diagram of a battery cell 20 according to some embodiments of the present invention. The battery 100 includes a housing 10 and a battery cell 20 , wherein the battery cell 20 is accommodated in the housing 10 .

[0105] The housing 10 is used to provide assembly space for the battery cells 20 and can have various structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 overlap each other, and the first housing body 11 and the second housing body 12 together define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open. The first housing body 11 can be a plate-like structure, and the first housing body 11 overlaps the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define the assembly space. The first housing body 11 and the second housing body 12 can also be hollow structures with one end open, with the open side of the first housing body 11 overlapping the open side of the second housing body 12. Of course, the housing 10 formed by the first housing body 11 and the second housing body 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc. For example, in Figure 2, the housing 10 is in the shape of a rectangular parallelepiped.

[0106] In the battery 100, the number of battery cells 20 disposed in the housing 10 may be one or more. When there are multiple battery cells 20 disposed in the housing 10, the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. Mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 may be accommodated in the housing 10. Of course, the battery 100 may also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules may be connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the housing 10. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component, which is used to connect the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0107] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be cylindrical, flat, rectangular, or in other shapes. For example, in FIG3 , the battery cell 20 is a rectangular parallelepiped.

[0108] In some embodiments, as shown in Figure 2, the battery 100 may further include a pressure strip 30. The battery 100 includes multiple battery cells 20. The pressure strip 30 is arranged in the box body 10. The pressure strip 30 is used to connect with the multiple battery cells 20 to fasten the multiple battery cells 20 into a whole, thereby helping to reduce the phenomenon of multiple battery cells 20 shaking or colliding with each other in the box body 10.

[0109] For example, in Figure 2, one end of the battery cell 20 in the thickness direction X of the first wall is bonded to the bottom of the box body 10, that is, one end of the battery cell 20 in the thickness direction X of the first wall is bonded to the bottom surface of the second box body 12 facing the first box body 11, and the other end is bonded to the pressure strip 30. The pressure strip 30 is bonded to multiple battery cells 20 so that the multiple battery cells 20 accommodated in the box body 10 form a whole, thereby improving the overall structural strength of the battery 100 and reducing the risk of the battery cells 20 shaking or colliding with each other during use.

[0110] It should be noted that the battery cell 20 can be placed upright or inverted within the box 10. When the battery cell 20 is placed upright within the box 10, the bottom of the battery cell 20 is generally bonded to the bottom of the box 10, and the pressure strip 30 is bonded to the top of the battery cell 20. When the battery cell 20 is placed inverted within the box 10, the top of the battery cell 20 is generally bonded to the top of the box 10, and the pressure strip 30 is bonded to the bottom of the battery cell 20. For example, in FIG2 , the battery cell 20 is placed upright within the box 10.

[0111] According to some embodiments of the present application, with reference to Figures 2 and 3, and further with reference to Figures 4 and 5, Figure 4 is a top view of a battery cell 20 provided in some embodiments of the present application, and Figure 5 is a schematic structural diagram of a battery cell 20 (after removing the insulating member 23) provided in some embodiments of the present application. The present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, and an insulating member 23. The housing 21 includes a first wall 211. The electrode assembly 22 is accommodated in the housing 21. The insulating member 23 is coated on the outside of the housing 21 and covers the outer surface of the first wall 211 facing away from the electrode assembly 22 in the thickness direction X of the first wall. The insulating member 23 is provided with a first hollow area 231. Along the thickness direction X of the first wall, the first hollow area 231 is located on the side of the first wall 211 facing away from the electrode assembly 22. The first wall 211 forms a first exposed area 2111 at a position corresponding to the first hollow area 231. The first exposed area 2111 is used to connect to the pressure strip 30.

[0112] The housing 21 can also be used to contain an electrolyte, such as an electrolyte solution. The housing 21 can have various structural forms, such as a cylinder or a rectangular parallelepiped. Similarly, the housing 21 can be made of various materials, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0113] In some embodiments, the housing 21 may further include a second wall 212 and a side wall 213, wherein the second wall 212 and the first wall 211 are arranged opposite to each other in the thickness direction X of the first wall, and the side wall 213 is arranged around the second wall 212, and the side wall 213 and the second wall 212 are an integrally formed structure, so that one end of the side wall 213 is connected to the second wall 212, and the other end is enclosed to form an opening 2131 opposite to the second wall 212, that is, the side wall 213 and the second wall 212 form a housing with a receiving cavity. The housing 21 has a housing cavity for accommodating the electrode assembly 22 and has an opening 2131. That is, the sidewall 213 and the second wall 212 form a hollow structure with an opening 2131 at one end. The first wall 211 covers the opening 2131 of the sidewall 213. That is, the first wall 211 serves as an end cap for the housing 21, sealing the opening 2131. The first wall 211 covers the opening 2131 of the sidewall 213 and forms a sealed connection, thereby forming a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the first exposed area 2111 is formed on the end cap of the housing 21.

[0114] It should be noted that, in other embodiments, the side wall 213 may also be an integrally formed structure with the first wall 211, and correspondingly, the second wall 212 is an end cap that closes the opening 2131, that is, the first exposed area 2111 is formed on the bottom wall of the shell 21 opposite to the end cap. Of course, it is understandable that the shell 21 is not limited to the above structure, and the shell 21 may also have other structures. For example, the shell 21 may include a first wall 211, a second wall 212, and a side wall 213 that are separately arranged. The side wall 213 encloses a hollow structure with openings 2131 at opposite ends. The first wall 211 and the second wall 212 respectively cover one opening 2131 of the side wall 213 and form a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0115] When assembling the battery cell 20 , the electrode assembly 22 can be placed in the shell formed by the side wall 213 and the second wall 212 , and the shell is filled with electrolyte. Then, the first wall 211 is covered with the opening 2131 of the shell to complete the assembly of the battery cell 20 .

[0116] The housing 21 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, or a prismatic structure. The shape of the housing 21 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, a cylindrical housing 21 can be used; if the electrode assembly 22 has a rectangular parallelepiped structure, a rectangular parallelepiped housing 21 can be used. For example, in FIG3 , the housing 21 has a rectangular parallelepiped structure.

[0117] It should be noted that the electrode assembly 22 is a component in the battery cell 20 where the electrochemical reaction occurs. The electrode assembly 22 may include a positive electrode sheet, a negative electrode sheet, and a separator. The structure of the electrode assembly 22 may be various. For example, the electrode assembly 22 may be a wound structure formed by winding the positive electrode sheet, the separator, and the negative electrode sheet, or a stacked structure formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet. Similarly, the electrode assembly 22 housed in the outer shell 21 may be one or more. For example, in FIG2 , there are two electrode assemblies 22, and the two electrode assemblies 22 are stacked along their thickness direction.

[0118] The insulating member 23 is wrapped around the outside of the shell 21 and covers the outer surface of the first wall 211 facing away from the electrode assembly 22 in the thickness direction X of the first wall, that is, the insulating member 23 is wrapped around the entire outer surface of the shell 21, so that the first wall 211 of the shell 21 is covered by the insulating member 23.

[0119] For example, the insulating member 23 may be made of various materials, such as rubber, silicone or rubber, etc. For example, the insulating member 23 is bonded to the outer surface of the housing 21 .

[0120] The first wall 211 forms a first exposed area 2111 at a position corresponding to the first hollow area 231, that is, the insulating member 23 is provided with a first hollow area 231, so that the first wall 211 of the shell 21 has an area avoided by the first hollow area 231, thereby forming a first exposed area 2111 on the first wall 211 that is not covered by the insulating member 23.

[0121] Optionally, the number of the first hollowed-out area 231 provided on the insulating member 23 may be one or more. For example, in FIG4 , the insulating member 23 is provided with two first hollowed-out areas 231 , which are spaced apart along the first direction Y to form two first exposed areas 2111 spaced apart along the first direction Y on the first wall 211 . The first direction Y is perpendicular to the thickness direction X of the first wall to increase the connection strength between the first wall 211 and the bead 30 . Of course, in other embodiments, the number of the first hollowed-out areas 231 may also be one, three, four, or five, etc.

[0122] Exemplarily, the first hollow area 231 is rectangular, and correspondingly, the first exposed areas 2111 formed on the first wall 211 are also rectangular. In other embodiments, the first hollow area 231 may also be triangular, pentagonal, circular, or elliptical.

[0123] It should be noted that the first exposed area 2111 is used to connect to the bead 30 , and the connection between the first exposed area 2111 and the bead 30 can also be various, such as bonding or welding. For example, in the embodiment of the present application, the first exposed area 2111 is used to bond to the bead 30 .

[0124] In some embodiments, as shown in FIG5 , the battery cell 20 may further include a pressure relief mechanism 24 mounted on the housing 21 . The pressure relief mechanism 24 is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0125] Optionally, the pressure relief mechanism 24 may be arranged on the first wall 211 of the outer shell 21, or on the second wall 212 of the outer shell 21, or on the side wall 213 of the outer shell 21. For example, in Figures 3 and 5, the pressure relief mechanism 24 is arranged on the first wall 211, and correspondingly, the insulating member 23 is provided with an avoidance opening 232 for avoiding the pressure relief mechanism 24, so that the pressure relief mechanism 24 can release the pressure inside the battery cell 20.

[0126] Illustratively, the pressure relief mechanism 24 may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, or a safety valve.

[0127] The outer surface of the shell 21 is covered with an insulating member 23, so that the insulating member 23 can insulate and isolate the shell 21 of the battery cell 20 from the external environment, so as to reduce the risk of short circuit of the battery cell 20 during use. By setting a first hollow area 231 at a position on one side of the insulating member 23 corresponding to the first wall 211, a first exposed area 2111 is formed on the first wall 211 of the shell 21, so that the battery cell 20 can be connected to the pressure strip 30 through the first exposed area 2111, so that when the battery cells 20 are assembled into a group to form a battery 100, the pressure strip 30 can be directly connected to the shell 21. The shell 21 is connected in rows, so that the shell 21 does not need to be indirectly connected to the pressure strip 30 through the insulating member 23, which is beneficial to reducing the influence of the insulating member 23 on the connection effect between the battery cell 20 and the pressure strip 30, and can effectively improve the connection strength, so as to reduce the easy detachment phenomenon of the indirect connection between the shell 21 and the pressure strip 30 through the insulating member 23, thereby achieving the insulation effect between the battery cell 20 and the external environment while improving the assembly quality of the battery cell 20 when it is grouped, which is beneficial to improving the assembly quality and usage stability of the battery 100 with such a battery cell 20.

[0128] According to some embodiments of the present application, as shown in FIG4 , the area of ​​the first exposed area 2111 is S, and S≥50mm 2 That is, the area of ​​the first wall 211 corresponding to a first hollow area 231 not covered by the insulating member 23 is greater than or equal to 50mm 2 .

[0129] By setting the area of ​​the first exposed area 2111 of the first wall 211 for connecting with the pressure strip 30 to be greater than or equal to 50mm 2 , so that the first wall 211 has a sufficient area to connect with the pressure strip 30, which is beneficial to increase the connection area between the first wall 211 and the pressure strip 30, thereby improving the connection strength.

[0130] According to some embodiments of the present application, as shown in FIG. 4 , the minimum distance between the first exposed area 2111 and the edge of the first wall 211 is D1, satisfying 1 mm ≤ D1 ≤ 5 mm.

[0131] By setting the minimum distance between the first exposed area 2111 and the edge of the first wall 211 to 1mm to 5mm, the minimum distance between the first hollow area 231 set on the insulating member 23 and the edge of the first wall 211 is 1mm to 5mm. On the one hand, this can alleviate the phenomenon that the manufacturing difficulty of the first hollow area 231 is greater due to the small distance between the first hollow area 231 and the edge of the first wall 211, thereby reducing the manufacturing difficulty of the battery cell 20. On the other hand, it can alleviate the phenomenon that the insulating member 23 covers the first wall 211 too much due to the large distance between the first hollow area 231 and the edge of the first wall 211, resulting in the area of ​​the first exposed area 2111 formed on the first wall 211 being too small.

[0132] According to some embodiments of the present application, as shown in Figures 3 and 5, the housing 21 further includes a second wall 212 and a side wall 213. Along the thickness direction X of the first wall, the second wall 212 is arranged opposite the first wall 211, and the side wall 213 is arranged around the first wall 211 and the second wall 212. The insulating member 23 includes a first insulating member 233 and a second insulating member 234 that are separately provided. The first insulating member 233 covers the outer surface of the first wall 211 facing away from the electrode assembly 22, and the second insulating member 234 covers the outer surface of the second wall 212 facing away from the electrode assembly 22 and the outer surface of the side wall 213 facing away from the electrode assembly 22.

[0133] The second wall 212 is disposed opposite the first wall 211 along the thickness direction X of the first wall, and the side wall 213 is disposed around the first wall 211 and the second wall 212. That is, the first wall 211 and the second wall 212 are spaced apart along the thickness direction X of the first wall and are respectively disposed at both ends of the side wall 213. The side wall 213 is disposed around the first wall 211 along the circumference of the first wall 211 and around the second wall 212 along the circumference of the second wall 212. It should be noted that the structure of the housing 21 can be various. The first wall 211, the second wall 212, and the side wall 213 can all be separate structures. Alternatively, the second wall 212 and the side wall 213 can be an integrally formed structure, with the first wall 211 connected to the end of the side wall 213 away from the first wall 211. Alternatively, the first wall 211 and the side wall 213 can be an integrally formed structure, with the second wall 212 connected to the end of the side wall 213 away from the second wall 212.

[0134] The first insulating member 233 covers the outer surface of the first wall 211 facing away from the electrode assembly 22 . That is, the first insulating member 233 is disposed on the first wall 211 and located on a side of the first wall 211 facing away from the interior of the battery cell 20 .

[0135] The second insulating member 234 covers the outer surface of the second wall 212 facing away from the electrode assembly 22 and the outer surface of the side wall 213 facing away from the electrode assembly 22, that is, the second insulating member 234 is arranged on the shell formed by the second wall 212 and the side wall 213, and is located on the side of the shell facing away from the interior of the battery cell 20.

[0136] By setting the insulator as a first insulating part 233 and a second insulating part 234 that are separately set, the first insulating part 233 is a structure covering the first wall 211, and the second insulating part 234 is a structure covering the side wall 213 and the second wall 212, so that the first insulating part 233 and the second insulating part 234 of the insulating part 23 are respectively set to correspond to the first wall 211 of the outer shell 21 and the second wall 212 and the side wall 213 of the outer shell 21, thereby reducing the difficulty of assembly between the insulating part 23 and the outer shell 21.

[0137] According to some embodiments of the present application, referring to Figures 3, 4, and 5, and further to Figure 6, Figure 6 is a schematic structural diagram of the first insulating member 233 of the battery cell 20 provided in some embodiments of the present application. The first hollow area 231 is provided in the first insulating member 233.

[0138] The first hollow area 231 is a through-hole structure provided on the first insulating member 233 . The first hollow area 231 penetrates the first insulating member 233 along the thickness direction X of the first wall to form a first exposed area 2111 on the first wall 211 .

[0139] It should be noted that in the embodiment where the minimum distance D1 between the first exposed area 2111 and the edge of the first wall 211 is 1 mm to 5 mm, since the first insulating member 233 covers the surface of the first wall 211 facing away from the electrode assembly 22, and the first hollow area 231 is arranged on the first insulating member 233, the minimum distance D1 between the first exposed area 2111 and the edge of the first wall 211 is the minimum distance between the first hollow area 231 and the edge of the first insulating member 233, that is, the minimum distance between the first hollow area 231 and the edge of the first insulating member 233 is 1 mm to 5 mm.

[0140] By separately setting the first hollow area 231 on the first insulating member 233 to form the first exposed area 2111 on the first wall 211, the structure of the insulating member 23 is simple, easy to process and manufacture, and the first hollow area 231 and the second insulating member 234 do not affect each other, which is conducive to reducing the difficulty of assembling the battery cell 20.

[0141] According to some embodiments of the present application, referring to Figures 7, 8, and 9, Figure 7 is a schematic structural diagram of a battery cell 20 provided in still other embodiments of the present application, Figure 8 is a top view of a battery cell 20 provided in still other embodiments of the present application, and Figure 9 is a schematic structural diagram of a battery cell 20 provided in still other embodiments of the present application (after removing the first insulating member 233). The second insulating member 234 has a flange portion 2341, which is arranged along the circumference of the first wall 211 and is located on the side of the first wall 211 away from the electrode assembly 22. The flange portion 2341 and the edge of the first insulating member 233 together enclose a first hollow area 231.

[0142] Among them, the second insulating member 234 has a flange portion 2341, which is arranged along the circumference of the first wall 211 and is located on the side of the first wall 211 away from the electrode assembly 22, that is, the part of the second insulating member 234 arranged on the outside of the shell formed by the second wall 212 and the side wall 213 is folded onto the first wall 211, so that the second insulating member 234 is formed with a flange portion 2341 located on the outer surface of the first wall 211, and the flange portion 2341 is an annular structure extending along the circumference of the first wall 211.

[0143] The flange portion 2341 and the edge of the first insulating member 233 together enclose a first hollow area 231, that is, the first hollow area 231 is enclosed by the flange portion 2341 of the annular structure and the edge of the first insulating member 233 arranged on the outer surface of the first wall 211. In other words, the inner edge of the flange portion 2341 and the outer edge of the first insulating member 233 together define the first hollow area 231.

[0144] It should be noted that in an embodiment where the minimum distance D1 between the first exposed area 2111 and the edge of the first wall 211 is 1 mm to 5 mm, as shown in Figure 8, since the first hollow area 231 is a structure formed by the first insulating member 233 and the flange portion 2341, the minimum distance D1 between the first exposed area 2111 and the edge of the first wall 211 is the width of the flange portion 2341, that is, the width of the flange portion 2341 is 1 mm to 5 mm.

[0145] The second insulating member 234 has a flange portion 2341 arranged on the first wall 211 along the circumference of the first wall 211 and located at the edge of the first wall 211, so that the edge of the first insulating member 233 arranged on the first wall 211 and part of the flange portion 2341 are jointly enclosed to form a first hollow area 231, so as to form a first exposed area 2111 on the first wall 211. The battery cell 20 adopting this structure does not need to set the first insulating member 233 as a structure with a through hole, which is beneficial to improving the overall structural strength of the first insulating member 233. On the other hand, it is beneficial to control the size and dimensions of the first hollow area 231.

[0146] According to some embodiments of the present application, as shown in FIG. 7 and FIG. 9 , along the thickness direction X of the first wall, a portion of the flange portion 2341 is located between the first wall 211 and the first insulating member 233 .

[0147] Among them, part of the flange portion 2341 is located between the first wall 211 and the first insulating member 233, that is, part of the first insulating member 233 is arranged on the side of the flange portion 2341 away from the first wall 211 along the thickness direction X of the first wall, so that the first insulating member 233 and the first wall 211 jointly press the flange portion 2341.

[0148] For example, in Figures 7 and 9, the first insulating member 233 is a rectangular structure, the flange portion 2341 is a rectangular ring structure, the flange portion 2341 includes a first segment 2341a, a second segment 2341b, a third segment 2341c and a fourth segment 2341d connected in sequence along the circumference of the first wall 211, along the first direction Y, the first segment 2341a and the third segment 2341c are arranged opposite to each other, along the second direction Z, the second segment 2341b and the fourth segment 2341d are arranged opposite to each other, the first direction Y, the second direction Z and the thickness direction X of the first wall are perpendicular to each other, and the two ends of the first insulating member 233 in the second direction Z are respectively overlapped on the second segment 2341b and the fourth segment 2341d of the flange portion 2341, so as to realize that the flange portion 2341 is located between the first insulating member 233 and the first wall 211 in the thickness direction X of the first wall.

[0149] By arranging part of the flange portion 2341 of the second insulating member 234 between the first wall 211 and the first insulating member 233 in the thickness direction X of the first wall, the first insulating member 233 can press part of the flange portion 2341 onto the first wall 211, which is beneficial to improving the connection stability of the flange portion 2341 of the second insulating member 234 on the first wall 211, thereby reducing the phenomenon of the flange portion 2341 falling off.

[0150] According to some embodiments of the present application, referring to Figures 7, 8 and 9, the first insulating member 233 and the flange portion 2341 together enclose two first hollow areas 231. Along the first direction Y, the two first hollow areas 231 are respectively located at both ends of the first insulating member 233, and the first direction Y is perpendicular to the thickness direction X of the first wall.

[0151] Among them, along the first direction Y, the two first hollow areas 231 are respectively located at the two ends of the first insulating member 233, that is, the size of the first insulating member 233 in the first direction Y is smaller than the size of the flange portion 2341 in the first direction Y, so that the two ends of the first insulating member 233 in the first direction Y can respectively form two first hollow areas 231 with the inner edge of the flange portion 2341, thereby realizing that the two first hollow areas 231 are respectively located at the two ends of the first insulating member 233 in the first direction Y.

[0152] By enclosing the two ends of the first insulating member 233 in the first direction Y with the flange portion 2341 to form two hollow areas, two first exposed areas 2111 arranged along the first direction Y are formed on the first wall 211, and the two first exposed areas 2111 are respectively located at the two ends of the first insulating member 233. On the one hand, the first wall 211 can be connected to the molding 30 through the two first exposed areas 2111, which is beneficial to further improve the connection strength between the shell 21 and the molding 30. On the other hand, it can reduce the interference between the first exposed area 2111 and the molding 30 when it is connected to the first insulating member 233, which is beneficial to reduce the assembly difficulty between the battery cell 20 and the molding 30.

[0153] In some embodiments, referring to Figures 7, 8, and 9, the flange portion 2341 includes a first segment 2341a, a second segment 2341b, a third segment 2341c, and a fourth segment 2341d, which are sequentially connected along the circumference of the first wall 211. The first segment 2341a and the third segment 2341c are disposed opposite each other along the first direction Y, and the second segment 2341b and the fourth segment 2341d are disposed opposite each other along the second direction Z. The first direction Y, the second direction Z, and the thickness direction X of the first wall are perpendicular to each other. The first insulating member 233 is located between the first section 2341a and the third section 2341c in the first direction Y. The first section 2341a, a portion of the second section 2341b, a portion of the fourth section 2341d and one end of the first insulating member 233 in the first direction Y together form a first hollow area 231. The third section 2341c, a portion of the second section 2341b, a portion of the fourth section 2341d and the other end of the first insulating member 233 in the first direction Y together form another first hollow area 231.

[0154] In which, along the first direction Y, the first section 2341a and the third section 2341c are arranged opposite to each other, and along the second direction Z, the second section 2341b and the fourth section 2341d are arranged opposite to each other, that is, the flange portion 2341 of the second insulating member 234 is a rectangular ring structure.

[0155] The first insulating member 233 is located between the first section 2341a and the third section 2341c in the first direction Y. The first section 2341a, part of the second section 2341b, part of the fourth section 2341d, and one end of the first insulating member 233 in the first direction Y together form a first hollow area 231. The third section 2341c, part of the second section 2341b, part of the fourth section 2341d, and the other end of the first insulating member 233 in the first direction Y together form another first hollow area 231. That is, in the first direction Y, the first insulating member 233 is located between the first section 2341a and the third section 2341b. and the third segment 2341c, and the first insulating member 233 and the first segment 2341a and the third segment 2341c are all spaced apart. In the second direction Z, the two ends of the first insulating member 233 are respectively overlapped on the second segment 2341b and the fourth segment 2341d, so that the first insulating member 233 covers part of the second segment 2341b and part of the fourth segment 2341d, thereby forming a first hollow area 231 between one end of the first insulating member 233 in the first direction Y and the first segment 2341a, and forming another first hollow area 231 between the other end and the third segment 2341c.

[0156] The flanging portion 2341 is provided with a first section 2341a, a second section 2341b, a third section 2341c and a fourth section 2341d which are connected in sequence along the circumference of the first wall 211, and the first section 2341a and the third section 2341c are arranged opposite to each other along the first direction Y, and the second section 2341b and the fourth section 2341d are arranged opposite to each other along the second direction Z, so that the flanging portion 2341 is a rectangular ring structure, so that by arranging the first insulating member 233 between the first section 2341a and the third section 2341c in the first direction Y, the edges of the two ends of the first insulating member 233 in the first direction Y can form two first hollow areas 231 respectively with the flanging portion 2341, and the structure is simple and easy to implement.

[0157] According to some embodiments of the present application, as shown in Figures 3, 5 and 7, the second wall 212 and the side wall 213 are an integrally formed structure. Along the thickness direction X of the first wall, one end of the side wall 213 is connected to the second wall 212, and the other end is enclosed to form an opening 2131. The first wall 211 is an end cover that closes the opening 2131.

[0158] The second wall 212 and the side wall 213 enclose a hollow structure with an opening 2131 at one end in the thickness direction X of the first wall, and the first wall 211 covers the opening 2131 to form a housing 21 for accommodating the electrode assembly 22. Of course, in other embodiments, the second wall 212 and the side wall 213 may also be a split structure, that is, the side wall 213 is a hollow structure with openings 2131 at both ends in the thickness direction X of the first wall, and the first wall 211 and the second wall 212 respectively cover the two openings 2131 of the side wall 213.

[0159] The second wall 212 and the side wall 213 are an integrally formed structure, that is, the second wall 212 and the side wall 213 of the housing 21 are made by an integral forming process, such as stamping or casting.

[0160] By setting the second wall 212 and the side wall 213 of the shell 21 as an integrally formed structure, and forming an opening 2131 at the end of the side wall 213 away from the second wall 212, and the first wall 211 closing the opening 2131, so that the shell 21 is assembled from two parts, the shell 21 with this structure makes it easy to cover the second insulating part 234 of the insulating part 23 on the outer surface of the integrally formed second wall 212 and side wall 213, which is beneficial to reducing the difficulty of assembling the battery cell 20.

[0161] According to some embodiments of the present application, referring to Figures 3 and 6, and also to Figures 7 and 10, Figure 10 is a schematic structural diagram of the first insulating member 233 of a battery cell 20 provided in still further embodiments of the present application. The battery cell 20 also includes an electrode terminal 25, which is disposed on the first wall 211 and electrically connected to the electrode assembly 22. The insulating member 23 is provided with a mounting hole 235, and the electrode terminal 25 is disposed within the mounting hole 235. The mounting hole 235 is spaced apart from the first hollow area 231.

[0162] The mounting hole 235 is spaced apart from the first hollow area 231 , that is, the electrode terminal 25 disposed on the first wall 211 is spaced apart from the first hollow area 231 , and part of the insulating member 23 is located between the electrode terminal 25 and the first hollow area 231 .

[0163] The electrode terminal 25 is arranged on the first wall 211, and a mounting hole 235 for the electrode terminal 25 to pass through is provided at the position of the insulating member 23 corresponding to the electrode terminal 25. By spacing the mounting hole 235 and the first hollow area 231, on the one hand, the first exposed area 2111 formed by the first wall 211 corresponding to the first hollow area 231 can be spaced apart from the electrode terminal 25 to reduce the interference between the first exposed area 2111 and the electrode terminal 25 when connected to external components. On the other hand, the insulating member 23 is not connected to each other between the first hollow area 231 and the mounting hole 235, so that the insulating member 23 can be sleeved on the electrode terminal 25 to improve the connection reliability of the insulating member 23.

[0164] According to some embodiments of the present application, referring to FIG. 3 and FIG. 6 , and referring to FIG. 7 and FIG. 10 , the minimum distance between the first hollow area 231 and the mounting hole 235 is D2 , satisfying D2 ≥ 0.5 mm.

[0165] Among them, the minimum distance between the first hollow area 231 and the mounting hole 235 is D2, that is, in the arrangement direction of the first hollow area 231 and the mounting hole 235, the minimum size of the part of the first insulating part 233 of the insulating part 23 located between the first hollow area 231 and the mounting hole 235 is D2.

[0166] By setting the minimum distance between the first hollow area 231 and the mounting hole 235 to be greater than or equal to 0.5 mm, the minimum size of the portion of the insulating member 23 between the first hollow area 231 and the mounting hole 235 is greater than or equal to 0.5 mm, thereby alleviating the risk of breakage of the insulating member 23 due to the small size of the portion between the first hollow area 231 and the mounting hole 235.

[0167] In some embodiments, referring again to Figures 3 and 6 , and also to Figures 7 and 10 , the insulating member 23 is provided with two first hollow regions 231 arranged along a first direction Y, thereby forming two first exposed regions 2111 arranged along the first direction Y on the first wall 211. The first direction Y is perpendicular to the thickness direction X of the first wall. Two electrode terminals 25 are provided on the first wall 211. The two electrode terminals 25 are arranged along the first direction Y and are located between the two first hollow regions 231. Along the first direction Y, the minimum distance D2 between each first hollow region 231 and the adjacent mounting hole 235 is.

[0168] It should be noted that, in the embodiment in which the first hollow area 231 is provided on the first insulating member 233, in FIG6 , D2 is the distance between the first hollow area 231 and the adjacent mounting hole 235 in the first direction Y; in the embodiment in which the first insulating member 233 and the flange portion 2341 of the second insulating member 234 are enclosed, in FIG10 , D2 is the distance between the first hollow area 231 and one end adjacent to the first insulating member 233 in the first direction Y.

[0169] The insulating member 23 is provided with two first hollow areas 231 arranged along the first direction Y, and the first wall 211 is provided with two electrode terminals 25 arranged along the first direction Y and both located between the two first hollow areas 231, so that the minimum distance between the first hollow area 231 and the adjacent mounting hole 235 is D2. By setting the minimum size of D2, the risk of breakage of the portion of the insulating member 23 located in the first exposed area 2111 and the electrode terminal 25 in the first direction Y during use can be reduced.

[0170] According to some embodiments of the present application, as shown in Figures 3 and 7, the insulating member 23 is provided with two first hollow areas 231 arranged along a first direction Y, thereby forming two first exposed areas 2111 arranged along the first direction Y on the first wall 211. The first direction Y is perpendicular to the thickness direction X of the first wall. Along the first direction Y, the electrode terminal 25 is located between the two first exposed areas 2111. In other words, the two first hollow areas 231 are respectively located on either side of the two electrode terminals 25 in the first direction Y, so that one first hollow area 231, one electrode terminal 25, another electrode terminal 25, and another first hollow area 231 are arranged in sequence along the first direction Y.

[0171] By providing two first hollow areas 231 arranged along the first direction Y on the insulating member 23, two first exposed areas 2111 arranged along the first direction Y are formed on the first wall 211, and the electrode terminal 25 is provided between the two first exposed areas 2111. Therefore, on the one hand, the connection strength between the first wall 211 and the pressure strip 30 can be further improved by the two first exposed areas 2111. On the other hand, by providing the two first exposed areas 2111 on both sides of the electrode terminal 25, the connection difficulty between the battery cell 20 and the pressure strip 30 during the grouping process can be reduced.

[0172] It should be noted that in some embodiments, the battery cell 20 may also have other structures. For example, the housing 21 further includes a second wall 212, which is disposed opposite the first wall 211 along the thickness direction X of the first wall. The battery cell 20 also includes two electrode terminals 25, which are disposed on the first wall 211 and the second wall 212, respectively. Both electrode terminals 25 are electrically connected to the electrode assembly 22. In other words, the two electrode assemblies 22 for outputting or inputting the positive and negative electrodes of the battery cell 20 are respectively disposed on either side of the housing 21 along the thickness direction X of the first wall. Of course, in other embodiments, the electrode terminals 25 may also be disposed on the side walls 213.

[0173] By respectively arranging the two electrode terminals 25 of the battery cell 20 on the first wall 211 and the second wall 212 opposite to each other of the housing 21, the first wall 211 can have more space to form the first exposed area 2111, and the difficulty of arranging the first hollow area 231 of the insulating member 23 can be reduced.

[0174] According to some embodiments of the present application, with reference to FIG3 and FIG5, and further with reference to FIG11, FIG11 is a bottom view of a battery cell 20 provided in some embodiments of the present application. The housing 21 further includes a second wall 212, which is arranged opposite to the first wall 211 along the thickness direction X of the first wall. The insulating member 23 is further provided with a second hollow area 236, which is located on the side of the second wall 212 away from the electrode assembly 22 along the thickness direction X of the first wall. The second wall 212 forms a second exposed area 2121 at a position corresponding to the second hollow area 236, and the second exposed area 2121 is used to connect to the box body 10.

[0175] In which, the second wall 212 forms a second exposed area 2121 at a position corresponding to the second hollow area 236, that is, the insulating part 23 is provided with a second hollow area 236, so that the second wall 212 of the shell 21 has an area avoided by the second hollow area 236, thereby forming a second exposed area 2121 on the second wall 212 that is not covered by the insulating part 23.

[0176] Optionally, the number of the second hollow area 236 provided on the insulating member 23 may be one or more. For example, in FIG11 , the insulating member 23 is provided with one second hollow area 236 to form a second exposed area 2121 on the second wall 212. Of course, in other embodiments, the number of the second hollow areas 236 may be two, three, four, or five.

[0177] Exemplarily, the second hollow area 236 is rectangular, and correspondingly, the second exposed area 2121 formed on the second wall 212 is also rectangular. In other embodiments, the second hollow area 236 may also be triangular, pentagonal, circular, or elliptical.

[0178] The second exposed area 2121 is used to connect to the box body 10 , and the connection between the second exposed area 2121 and the box body 10 can be various, such as bonding or welding.

[0179] It should be noted that in an embodiment where the insulating member 23 includes a first insulating member 233 and a second insulating member 234 that are separately arranged, the second hollow area 236 is arranged on the second insulating member 234, and the second hollow area 236 is a through hole arranged on the second insulating member 234, and is located on the side of the second wall 212 away from the electrode assembly 22.

[0180] By distributing the first hollow area 231 and the second hollow area 236 at positions on both sides of the insulating member 23 corresponding to the first wall 211 and the second wall 212, that is, the insulating member 23 is respectively provided with the first hollow area 231 and the second hollow area 236 on the opposite sides of the shell 21 along the thickness direction X of the first wall, so that the first exposed area 2111 and the second exposed area 2121 are respectively formed on the first wall 211 and the second wall 212 of the shell 21, so that the first wall 211 and the second wall 212 of the shell 21 can be connected to the pressure strip 30 and the box body 10 through the first exposed area 2111 and the second exposed area 2121 respectively, thereby improving the structural stability of the battery cell 20 assembled in the box body 10, and enabling the shell 21 to be directly connected to the box body 10, so as to reduce the phenomenon that the shell 21 and the box body 10 are easily detached due to indirect connection through the insulating member 23.

[0181] According to some embodiments of the present application, the present application further provides a battery 100 comprising the battery cell 20 of any of the above solutions.

[0182] According to some embodiments of the present application, as shown in FIG. 2 and FIG. 3 , the battery 100 further includes a box body 10 and a bead 30 . The bead 30 and the battery cell 20 are both accommodated in the box body 10 , and the first exposed area 2111 is bonded to the bead 30 .

[0183] For example, in Figure 2, the battery cell 20 is placed upright in the box body 10, that is, the second wall 212 of the battery cell 20 is configured to support the electrode assembly 22, so that the second wall 212 can support the electrode assembly 22 in the thickness direction X of the first wall, that is, the first wall 211 of the outer shell 21 is set facing the top of the box body 10, and the second wall 212 of the outer shell 21 is set facing the bottom of the box body 10, or in actual use, the second wall 212 of the outer shell 21 is set toward the ground or downward, so that the thickness direction X of the first wall is the up and down direction.

[0184] The pressure strip 30 is disposed between the first wall 211 and the top of the box body 10 in the thickness direction X of the first wall, and the pressure strip 30 is bonded to the first exposed area 2111 formed by the first wall 211 .

[0185] Optionally, the pressure strip 30 is made of insulating material, such as rubber, plastic or silicone. A pressure strip 30 with such a structure can achieve an insulating connection between the pressure strip 30 and the battery cell 20 to reduce the risk of leakage or short circuit.

[0186] It should be noted that, in other embodiments, the battery cell 20 may also be placed upside down in the box body 10, that is, the first wall 211 of the battery cell 20 is configured to support the electrode assembly 22, so that the first wall 211 can support the electrode assembly 22 in the thickness direction X of the first wall, so that the molding 30 is arranged between the first wall 211 and the bottom of the box body 10 in the thickness direction X of the first wall, and the molding 30 is bonded to the first exposed area 2111 formed by the first wall 211.

[0187] The battery 100 is provided with a box body 10 and a molding 30. The molding 30 is bonded to the first exposed area 2111 of the outer shell 21 of the battery cell 20 to fasten the battery cell 20 in the box body 10 of the battery 100. The battery 100 with this structure enables the outer shell 21 of the battery cell 20 to be directly bonded to the molding 30, so that the outer shell 21 does not need to be indirectly connected to the molding 30 through the insulating member 23, which is beneficial to reduce the influence of the insulating member 23 on the bonding effect between the battery cell 20 and the molding 30, and can effectively improve the bonding strength to reduce the phenomenon that the outer shell 21 and the molding 30 are easily detached due to indirect bonding through the insulating member 23, thereby improving the structural stability of the battery cell 20 assembled in the box body 10, reducing the risk of shaking or detachment of the battery cell 20 during use, and thus improving the assembly quality and use stability of the battery 100.

[0188] In some embodiments, referring to FIG. 2 and FIG. 3 , the battery 100 includes a plurality of battery cells 20 , and the holding strip 30 is bonded to the first exposed areas 2111 of the plurality of battery cells 20 .

[0189] The holding strip 30 is bonded to the first exposed areas 2111 of the plurality of battery cells 20 , that is, one holding strip 30 is used to bond to the first exposed areas 2111 of the housings 21 of the plurality of battery cells 20 .

[0190] A plurality of battery cells 20 are arranged in the box body 10, and the pressure strip 30 is bonded to the first exposed areas 2111 of the plurality of battery cells 20, so that the plurality of battery cells 20 can be connected into a whole through the pressure strip 30, which is beneficial to improving the structural strength and structural stability of the plurality of battery cells 20 in the box body 10, and thus can effectively improve the use stability of the battery 100.

[0191] According to some embodiments of the present application, as shown in Figures 2, 3, and 11, the housing 21 further includes a second wall 212, which is disposed opposite the first wall 211 along the thickness direction X of the first wall. The insulating member 23 further includes a second hollow region 236, which is located on a side of the second wall 212 facing away from the electrode assembly 22 along the thickness direction X of the first wall. The second wall 212 forms a second exposed region 2121 at a position corresponding to the second hollow region 236, and the second exposed region 2121 is bonded to the housing 10.

[0192] Exemplarily, the battery cell 20 is placed upright in the box 10 so that the second exposed area 2121 formed by the second wall 212 is bonded to the bottom of the box 10. It should be noted that if the battery cell 20 is placed upside down in the box 10, the second exposed area 2121 formed by the second wall 212 is bonded to the top of the box 10.

[0193] By bonding the second exposed area 2121 of the outer shell 21 of the battery cell 20 to the case 10, the battery cell 20 is further fastened to the case 10. The battery 100 using this structure enables the outer shell 21 of the battery cell 20 to be directly bonded to the case 10, so that the outer shell 21 does not need to be indirectly connected to the case 10 through the insulating part 23, which is beneficial to reduce the impact of the insulating part 23 on the bonding effect between the battery cell 20 and the case 10, and can effectively improve the bonding strength, thereby improving the structural stability of the battery cell 20 assembled in the case 10, so as to reduce the risk of the battery cell 20 shaking or detaching during use, thereby improving the assembly quality and usage stability of the battery 100.

[0194] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 100 of any of the above solutions, and the battery 100 is used to provide electrical energy to the electrical device.

[0195] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0196] According to some embodiments of the present application, as shown in Figures 3 to 7 , a battery cell 20 is provided. The battery cell 20 includes a housing 21, an electrode assembly 22, an insulating member 23, and two electrode terminals 25. The housing 21 includes a first wall 211, a second wall 212, and a side wall 213. The first wall 211 and the second wall 212 are arranged opposite each other along the thickness direction X of the first wall. The side wall 213 surrounds the second wall 212 and is integrally formed with the second wall 212. An opening 2131 is formed at one end of the side wall 213 away from the second wall 212. The first wall 211 serves as an end cap that closes the opening 2131. The electrode assembly 22 is housed within the housing 21. The insulating member 23 includes a first insulating member 233 and a second insulating member 234, which are separately provided. The first insulating member 233 covers the outer surface of the first wall 211 facing away from the electrode assembly 22, and the second insulating member 234 covers the outer surface of the second wall 212 facing away from the electrode assembly 22 and the outer surface of the side wall 213 facing away from the electrode assembly 22. The first insulating member 233 is provided with two first hollow areas 231 arranged at intervals along the first direction Y, so as to form two first exposed areas 2111 at positions corresponding to the two first hollow areas 231 on the first wall 211. The first exposed areas 2111 are used to bond with the pressure strip 30. The second insulating member 234 is provided with a second hollow area 236. The second wall 212 is provided with a second exposed area 2121 at a position corresponding to the second hollow area 236. The second exposed area 2121 is used to bond with the box body 10. The area of ​​the first exposed area 2111 is S1, which satisfies the following conditions: S1 ≥ 50 mm 2 The two electrode terminals 25 are both disposed on the first wall 211 and are electrically connected to the electrode assembly 22. Along the first direction Y, the two electrode terminals 25 are located between the two first exposed areas 2111. The first insulating member 233 is provided with mounting holes 235 for the electrode terminals 25 to pass through. The minimum distance D1 between each first hollow area 231 and an adjacent mounting hole 235 satisfies the requirement that D1 ≥ 0.5 mm.

[0197] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0198] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, comprising: a housing comprising a first wall; an electrode assembly housed in the housing; as well as an insulating member, covering the outer side of the shell and covering the outer surface of the first wall away from the electrode assembly in the thickness direction of the first wall; In which, the insulating part is provided with a first hollow area. Along the thickness direction of the first wall, the first hollow area is located on the side of the first wall away from the electrode assembly. The first wall forms a first exposed area at a position corresponding to the first hollow area, and the first exposed area is used to connect with the pressure strip.

2. The battery cell according to claim 1, wherein: The area of ​​the first exposed area is S, which satisfies S≥50mm 2 .

3. The battery cell according to claim 1 or 2, wherein: The minimum distance between the first exposed area and the edge of the first wall is D1, which satisfies the following condition: 1 mm ≤ D1 ≤ 5 mm.

4. The battery cell according to any one of claims 1 to 3, wherein: The housing further includes a second wall and a side wall, wherein the second wall is arranged opposite to the first wall along the thickness direction of the first wall, and the side wall is arranged around the first wall and the second wall; The insulating member includes a first insulating member and a second insulating member that are separately arranged. The first insulating member covers the outer surface of the first wall facing away from the electrode assembly, and the second insulating member covers the outer surface of the second wall facing away from the electrode assembly and the outer surface of the side wall facing away from the electrode assembly.

5. The battery cell according to claim 4, wherein: The first hollow area is disposed on the first insulating member. The battery cell according to claim 4 , wherein: The second insulating member has a flange portion, which is arranged along the circumference of the first wall and located on a side of the first wall away from the electrode assembly. The flange portion and the edge of the first insulating member together enclose the first hollow area.

7. The battery cell according to claim 6, wherein: Along the thickness direction of the first wall, a portion of the flange portion is located between the first wall and the first insulating member.

8. The battery cell according to claim 6 or 7, wherein: The first insulating member and the flange portion together enclose two first hollow areas. Along a first direction, the two first hollow areas are respectively located at two ends of the first insulating member. The first direction is perpendicular to the thickness direction of the first wall.

9. The battery cell according to claim 8, wherein: The flange portion includes a first section, a second section, a third section and a fourth section sequentially connected along the circumference of the first wall; Along the first direction, the first section is opposite to the third section, and along the second direction, the second section is opposite to the fourth section. The first direction, the second direction, and the thickness direction of the first wall are perpendicular to each other. The first insulating member is located between the first segment and the third segment in the first direction, and the first segment, a portion of the second segment, a portion of the fourth segment, and one end of the first insulating member in the first direction together enclose a first hollow area, and the third segment, a portion of the second segment, a portion of the fourth segment, and the other end of the first insulating member in the first direction together enclose another first hollow area.

10. The battery cell according to any one of claims 4 to 9, wherein: The second wall and the side wall are integrally formed. Along the thickness direction of the first wall, one end of the side wall is connected to the second wall, and the other end is enclosed to form an opening. The first wall is an end cover that closes the opening.

11. The battery cell according to any one of claims 1 to 10, wherein: The battery cell further comprises: an electrode terminal, disposed on the first wall and electrically connected to the electrode assembly; The insulating member is provided with a mounting hole, the electrode terminal is passed through the mounting hole, and the mounting hole is spaced apart from the first hollow area.

12. The battery cell according to claim 11, wherein: The minimum distance between the first hollow area and the mounting hole is D2, which satisfies D2≥0.5mm.

13. The battery cell according to claim 12, wherein: The insulating member is provided with two first hollow areas arranged along a first direction to form two first exposed areas arranged along the first direction on the first wall, wherein the first direction is perpendicular to a thickness direction of the first wall; Wherein, the first wall is provided with two electrode terminals, the two electrode terminals are arranged along the first direction, and the two The electrode terminal is located between two of the first hollow areas. Along the first direction, the minimum distance between each of the first hollow areas and the adjacent mounting hole is D2.

14. The battery cell according to claim 11 or 12, wherein: The insulating member is provided with two first hollow areas arranged along a first direction to form two first exposed areas arranged along the first direction on the first wall, wherein the first direction is perpendicular to a thickness direction of the first wall; Along the first direction, the electrode terminal is located between two first exposed areas.

15. The battery cell according to any one of claims 1 to 10, wherein: The housing further includes a second wall, which is arranged opposite to the first wall along the thickness direction of the first wall; The battery cell further includes two electrode terminals, which are respectively disposed on the first wall and the second wall, and are both electrically connected to the electrode assembly.

16. The battery cell according to any one of claims 1 to 15, wherein: The housing further includes a second wall, which is arranged opposite to the first wall along the thickness direction of the first wall; The insulating member is also provided with a second hollow area. Along the thickness direction of the first wall, the second hollow area is located on the side of the second wall away from the electrode assembly. The second wall forms a second exposed area at a position corresponding to the second hollow area. The second exposed area is used to connect to the box body.

17. A battery comprising the battery cell according to any one of claims 1 to 16.

18. The battery according to claim 17, wherein The battery further includes a box body and a pressure strip. The pressure strip and the battery cell are both accommodated in the box body, and the first exposed area is bonded to the pressure strip.

19. The battery according to claim 18, wherein The battery includes a plurality of battery cells, and the press strip is bonded to the first exposed areas of the plurality of battery cells.

20. The battery according to claim 18 or 19, wherein The housing further includes a second wall, which is arranged opposite to the first wall along the thickness direction of the first wall; The insulating member is also provided with a second hollow area. Along the thickness direction of the first wall, the second hollow area is located on the side of the second wall away from the electrode assembly. The second wall forms a second exposed area at a position corresponding to the second hollow area, and the second exposed area is bonded to the box body.

21. An electrical device comprising the battery according to any one of claims 17 to 20.

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