Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment. The battery monomer comprises at least one pair of electrode assemblies, a shell and a connecting piece, the shell comprises a bottom wall, a top wall and a side wall, a containing cavity is defined by the bottom wall, the top wall and the side wall, and the at least one pair of electrode assemblies are located in the containing cavity; and the connecting piece is arranged between the same pair of electrode assemblies and is respectively bonded with two different electrode assemblies in the same pair of electrode assemblies. The same pair of electrode assemblies are bonded through the connecting pieces, dislocation generated by the same pair of electrode assemblies can be reduced in the process of welding the tabs and installing the electrode assemblies into the shell, and therefore pulling of the tabs of the same pair of electrode assemblies can be reduced after the tabs are welded and installed into the shell, the situation that the tabs of the electrode assemblies crack is reduced, and the service life of the electrode assemblies is prolonged. And the working reliability of the battery monomers is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery cell, a battery device and an electrical equipment. Background Art

[0002] During the production process of batteries, paired electrode assemblies in a battery cell are put into a shell. Before the electrode assemblies are loaded into the shell, the tabs of the same pair of electrode assemblies need to be welded. During the process of putting them into the shell, the tabs of the same pair of electrode assemblies are prone to being pulled, resulting in the problem that the tabs are likely to crack, which affects the internal resistance of the electrode assemblies and the capacity of the battery. Summary of the Utility Model

[0003] In view of the above problems, the present application provides a battery cell, a battery device and an electrical equipment. By bonding the same pair of electrode assemblies through a connecting piece, the situation of dislocation during tab welding and assembly can be reduced.

[0004] In a first aspect, the present application provides a battery cell, including:

[0005] At least one pair of electrode assemblies;

[0006] A housing, including a bottom wall, a top wall and a side wall. The bottom wall, the top wall and the side wall enclose an accommodation cavity, and at least one pair of electrode assemblies is located in the accommodation cavity;

[0007] A connecting piece, disposed between the same pair of electrode assemblies and adhesively bonded to two different electrode assemblies in the same pair of electrode assemblies respectively.

[0008] By adhesively bonding between the same pair of electrode assemblies through the connecting piece, the dislocation generated by the same pair of electrode assemblies can be reduced during tab welding and the process of loading the electrode assemblies into the housing. Thus, after tab welding and loading into the shell, the pulling of the tabs of the same pair of electrode assemblies can be reduced, so as to reduce the situation of tab cracking of the electrode assemblies and improve the working reliability of the battery cell.

[0009] In some embodiments, the number of connecting pieces between the same pair of electrode assemblies is multiple, and the multiple connecting pieces are arranged at intervals along a first direction. The first direction intersects with the thickness direction of the bottom wall, and the plane where the first direction and the thickness direction of the bottom wall are located together intersects with the arrangement direction of a pair of electrode assemblies.

[0010] The multiple connecting pieces are arranged at intervals along the first direction. On the one hand, the bonding strength between the same pair of electrode assemblies can be improved, and the possibility of dislocation can be reduced. On the other hand, adjacent two connecting pieces form a flow channel, which can accelerate the infiltration rate of the electrolyte after the electrolyte is injected. During thermal runaway, the gas on both sides of the electrode assemblies along the thickness direction of the bottom wall can be conducted, reducing the possibility that the battery cell cannot release pressure in time due to excessive local pressure inside the housing and improving the safety of the battery cell.

[0011] In some embodiments, the number of connecting members is 2 - 4.

[0012] Thus, during the assembly process, it is possible to ensure a certain bonding strength for the same pair of electrode assemblies while taking into account the usage amount of the connecting members, and the number of connecting members is set to 2 - 4.

[0013] In some embodiments, there are multiple pairs of electrode assemblies, and the multiple pairs of electrode assemblies are arranged along a second direction, which is the same as the arrangement direction of the same pair of electrode assemblies, and a connecting member is provided between adjacent pairs of electrode assemblies.

[0014] Thus, during the process of inserting into the housing, the possibility of misalignment between adjacent pairs of electrode assemblies can be reduced, so as to reduce the damage of the electrode assemblies.

[0015] In some embodiments, the connecting member between adjacent pairs of electrode assemblies is a first connecting member, and the number of the first connecting members is multiple. The connecting member between the same pair of electrode assemblies is a second connecting member. Along the second direction, the orthographic projection of the second connecting member on the side wall is located between the orthographic projections of two adjacent first connecting members on the side wall.

[0016] Thus, the first connecting member and the second connecting member can be staggered. After inserting into the housing, the electrode assembly can be more easily compressed. Compared with the side-by-side arrangement of the first connecting member and the second connecting member, the occupied space of the electrode assembly in the housing can be increased to improve the volumetric energy density.

[0017] In some embodiments, a connecting member is provided between the side wall and the electrode assembly. The connecting member between the side wall and the electrode assembly is a third connecting member, and the side wall and the third connecting member jointly define a flow channel.

[0018] When the battery cell is thermally out of control, a large amount of gas will be generated on both sides of the electrode assembly along the thickness direction of the bottom wall. The flow channel connects the gas on both sides of the electrode assembly to reduce the situation of excessive local pressure in the housing, thereby improving the safety of the battery cell.

[0019] In some embodiments, the side wall includes two first side walls, and the two first side walls are spaced apart along the arrangement direction of a pair of electrode assemblies. At least one first side wall and the electrode assembly are provided with multiple third connecting members, and the multiple third connecting members are spaced apart along a first direction.

[0020] Multiple connecting members can form multiple flow channels to increase the exhaust path, thereby improving the reliability of the flow channel operation.

[0021] In some embodiments, the connecting member between the same pair of electrode assemblies is a second connecting member. Along the second direction, the orthographic projection of the second connecting member on the side wall is located between the orthographic projections of two adjacent third connecting members on the side wall, and the second direction is the same as the arrangement direction of the same pair of electrode assemblies.

[0022] Thus, the second connecting member and the third connecting member can be staggered, making it easier to compress the electrode assembly into the housing during the process of inserting the electrode assembly into the housing, and increasing the occupied space of the electrode assembly within the housing.

[0023] In some embodiments, the electrode assembly includes multiple pairs, and the multiple pairs of electrode assemblies are arranged along the second direction, and a connecting member is provided between adjacent pairs of electrode assemblies.

[0024] Thus, during the process of inserting into the housing, the possibility of misalignment between adjacent pairs of electrode assemblies can be reduced, so as to reduce the damage of the electrode assembly.

[0025] In some embodiments, the connecting member between adjacent pairs of electrode assemblies is a first connecting member, and the number of the first connecting members is multiple, and the multiple first connecting members are arranged at intervals along the first direction.

[0026] Thus, the connection strength between adjacent pairs of electrode assemblies can be increased, so as to reduce the relative movement between adjacent electrode assemblies during insertion into the housing, thereby reducing the damage of the electrode assembly during the assembly process.

[0027] In some embodiments, along the second direction, the orthographic projection of the second connecting member on the side wall is located between the orthographic projections of adjacent two first connecting members on the side wall.

[0028] Thus, during the process of inserting the electrode assembly into the housing, it is easier to compress the electrode assembly into the housing, and the occupied space of the electrode assembly within the housing is increased.

[0029] In some embodiments, the side wall further includes two second side walls, the two second side walls are arranged at intervals along the first direction, and at least one connecting member is provided between the second side wall and the electrode assembly.

[0030] Thus, the number of flow channels can be further increased, so that during thermal runaway, the probability that the gas on both sides of the electrode assembly cannot conduct due to the blockage of some flow channels by the expanded part of the electrode assembly is reduced, thereby making the pressure within the housing more balanced, which is beneficial to improving the safety of the battery cell.

[0031] In some embodiments, the connecting member is a connecting bar extending along the thickness direction of the bottom wall.

[0032] The connecting bar can reduce the bonding area and save the use of materials. <(

[0033] In some embodiments, the electrode assembly includes a main body portion, along the thickness direction of the bottom wall, the size of the main body portion is H, the size of the connecting member is L, and L = (1 / 3 - 2 / 3) * H.

[0034] Thus, on the one hand, it can ensure that the connecting member has a certain length to ensure the connection strength. When the number of the connecting members is multiple, it can ensure the length of the flow channels between adjacent two connecting members to improve the infiltration effect during the liquid injection process.

[0035] In some embodiments, the size of the connecting member in the first direction is W. The first direction intersects with the thickness direction of the bottom wall, and the plane where the first direction and the thickness direction of the bottom wall are located together intersects with the arrangement direction of a pair of electrode assemblies. The value range of W is 10 mm - 20 mm.

[0036] Thus, a certain supporting area can be provided for the electrode assemblies to reduce the extrusion force between the electrode assemblies and lower the stress concentration between the electrode assemblies.

[0037] In some embodiments, the electrode assembly includes a main body portion. The distance from the end of the connecting member facing the top wall to the top wall is less than or equal to the distance from the main body portion to the top wall. The end of the connecting member facing the bottom wall is flush with the bottom of the main body portion, or the end of the connecting member facing the bottom wall is lower than the bottom of the main body portion.

[0038] Thus, the length of the flow channel can be prevented from being too short. When the battery cell is thermally out of control, the possibility of the flow channel being blocked due to the expansion of the electrode assemblies is reduced, so that the flow channel can connect the gases on both sides of the main body portion along the thickness direction of the bottom wall, thereby reducing the situation of excessive local pressure inside the housing and improving the safety of the battery cell.

[0039] In some embodiments, along the thickness direction of the bottom wall, the size of the main body portion is H, and the size of the connecting member is L. The value range of L - H is 2 mm - 5 mm.

[0040] Thus, when the battery cell is thermally out of control, the possibility of the flow channel being blocked due to the expansion of the electrode assemblies is further reduced, and the reliability of the flow channel operation is improved.

[0041] In some embodiments, the connecting member is a flat structure, and the thickness direction of the connecting member is the same as the arrangement direction of a pair of electrode assemblies.

[0042] Thus, the space occupied by the connecting member inside the housing can be reduced to improve the space utilization rate inside the housing, so that the battery cell has a certain volumetric energy density.

[0043] In some embodiments, the thickness of the connecting member is s, and the value range of s is 0.1 mm - 0.5 mm.

[0044] Thus, the space occupied by the connecting member inside the housing can be reduced to improve the space utilization rate inside the housing; at the same time, the thinner design of the connecting member can reduce the extrusion force on the electrode assemblies after being inserted into the housing to lower the stress concentration of the electrode assemblies.

[0045] In some embodiments, the battery cell further includes a pressure relief mechanism. The pressure relief mechanism is disposed on the bottom wall or the top wall and is used to actuate when the battery cell is thermally out of control and the pressure inside the housing reaches a set value to release emissions.

[0046] Therefore, the provision of the flow channel can make the pressure inside the battery cell more uniform, so as to reduce the situation where the pressure relief mechanism cannot be opened in time due to uneven local pressure inside the battery cell, thereby improving the safety of the battery cell.

[0047] In a second aspect, the present application provides a battery device, including:

[0048] A box body having an accommodation space;

[0049] A battery cell assembly located inside the accommodation space, and the battery cell assembly includes a plurality of battery cells according to the first aspect.

[0050] Since the battery device includes all the technical features of the battery cell according to the first aspect, the effects are the same as those described above and will not be elaborated here.

[0051] In a third aspect, the present application provides an electrical device, including the battery device according to the second aspect, and the battery device is used to supply electrical energy to the electrical device.

[0052] Since the electrical device includes all the technical features of the battery device according to the second aspect, the effects are the same as those described above and will not be elaborated here.

[0053] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically gives the specific implementation manners of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0055] Figure 1 is an exploded view of a battery cell according to some embodiments of the present application;

[0056] Figure 2 is an axonometric view of a battery cell according to some embodiments of the present application;

[0057] Figure 3 is a side view of a battery cell according to some embodiments of the present application;

[0058] Figure 4 is a top view of a battery cell according to some embodiments of the present application;

[0059] Figure 5 and Figure 7B - B cross - sectional view of battery cells in different embodiments of body 4;

[0060] Figures 6A-6D is Figure 3 A - A cross - sectional view of battery cells in different embodiments of

[0061] Figure 8 is Figure 7 C - C cross - sectional view of

[0062] Figure 9 Explosion view of a battery device according to some embodiments of the present application;

[0063] Figure 10 Structural diagram of an electrical device being a vehicle according to some embodiments of the present application.

[0064] The reference numerals in the detailed implementation manners are as follows:

[0065] 1000, vehicle; 100, battery device; 200, controller; 300, motor;

[0066] 110, battery cell assembly; 120, housing; 121, first housing; 122, second housing;

[0067] 1100, battery cell;

[0068] 10, electrode assembly; 11, main body part; 12, tab; 20, outer shell; 21, side wall; 211, first side wall; 212, second side wall; 22, bottom wall; 23, top wall; 30, pressure relief mechanism; 40, connecting member; 41, first connecting member; 42, second connecting member; 43, third connecting member; 50, flow channel; 60, terminal; 70, adapter plate;

[0069] X, first direction; Y, second direction; Z, thickness direction of the bottom wall. Detailed implementation manners

[0070] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and thus are only examples and should not be used to limit the protection scope of the present application.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above - mentioned accompanying drawing descriptions are intended to cover non - exclusive inclusion.

[0072] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0073] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appearing in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0074] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0075] In the description of the embodiments of the present application, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0076] In the description of the embodiments of the present application, technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0077] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0078] During the battery production process, the paired electrode assemblies within the battery cell are inserted into the casing. Before the electrode assemblies are inserted into the casing, the tabs of the same pair of electrode assemblies need to be welded. During the insertion into the casing, the tabs of the same pair of electrode assemblies are prone to being pulled, resulting in easy cracking of the tabs, which affects the internal resistance of the electrode assembly and the capacity of the battery.

[0079] In view of this, the present application provides a battery cell. The same pair of electrode assemblies are bonded together through a connecting member, which can reduce the misalignment generated by the same pair of electrode assemblies during tab welding and the process of inserting the electrode assemblies into the outer casing. Thus, after tab welding and insertion into the casing, the pulling of the tabs of the same pair of electrode assemblies can be reduced, so as to reduce the situation of tab cracking of the electrode assembly and improve the reliability of the battery cell operation.

[0080] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0081] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0082] As an example, the battery cell assembly may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with cable ties.

[0083] In some embodiments, the battery apparatus may be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0084] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body by fixing the battery module in the box body.

[0085] As an example, the battery cell assembly may also be accommodated in the box body by directly fixing a plurality of battery cells to the box body.

[0086] As an example, the box body may include a first box body and a second box body. The first box body and the second box body are snapped together to accommodate the battery cell assembly.

[0087] As an example, the battery box may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the battery box to accommodate the battery cell assembly.

[0088] In some embodiments, the battery box can be part of the chassis structure of a vehicle. For example, part of the battery box can become at least part of the vehicle's bottom plate, or part of the battery box can become at least part of the cross beams and longitudinal beams of the vehicle.

[0089] The technical solutions described in the embodiments of this application are applicable to various electrical equipment using battery devices, such as battery-powered vehicles, vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0090] In some embodiments, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0091] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of this application do not limit this.

[0092] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, and the separator is disposed between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions such as lithium ions are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and allow the active ions to pass through at the same time.

[0093] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0094] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0095] As an example, the positive electrode current collector can be made of a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, pure metals, alloys, and metals with surface treatment can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, etc. The composite current collector can include a polymer material fiber layer and a metal layer. The composite current collector can be formed by forming metal materials such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy on a polymer material substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.

[0096] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode active materials 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 include, but are not limited to, lithium iron phosphate (such as LiFePO 4， Also referred to as LFP), lithium iron phosphate and carbon composite materials, lithium manganese phosphate (such as LiMnPO 4） , a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO 2） , lithium nickel oxide (such as LiNiO 2） , lithium manganese oxide (such as LiMnO2, LiMn2O 4） , lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2， Also referred to as NCM 333 ;LiNi 0.5 Co 0.2 Mn 0.3 O 2， Also referred to as NCM 523 ;LiNi 0.5 Co 0.25 Mn 0.25 O 2， Also referred to as NCM 211 ;LiNi 0.6 Co 0.2 Mn 0.2 O 2， Also referred to as NCM 622 ;LiNi 0.8 Co 0.1 Mn 0.1 O 2， Also referred to as NCM 811） , lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O 2） and at least one of its modified compounds. The modified compound refers to a substance obtained by modifying the above substances by means of doping or coating.

[0097] In some embodiments, the positive electrode may employ a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, foam carbon, or the like. When the foam metal serves as the positive electrode, the positive electrode active material may not be provided on the surface of the foam metal, or of course, the positive electrode active material may be provided. As an example, the positive electrode active material is filled and / or deposited in the foam metal.

[0098] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0099] As an example, the negative electrode current collector may employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, pure metal, alloy, or metal subjected to surface treatment may be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver, etc. The composite current collector may include a polymer material fiber layer and a metal layer. The composite current collector may be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a substrate of a polymer material (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0100] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0101] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is provided on any one or both of the two opposite surfaces of the negative electrode current collector.

[0102] As an example, the negative electrode active material may employ the negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material may be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as the negative electrode active material of a battery cell may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0103] In some embodiments, the negative electrode may employ a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal serves as the negative electrode sheet, the negative electrode active material may not be provided on the surface of the foam metal, or of course, the negative electrode active material may be provided.

[0104] As an example, the negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0105] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0106] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0107] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any publicly known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0108] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator membrane can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes or attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator membrane.

[0109] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0110] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The present application does not specifically limit the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0111] Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0112] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0113] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0114] In some embodiments, the electrolyte may optionally further include an additive. For example, the additive may include a negative electrode film-forming additive, may also include a positive electrode film-forming additive, and may further include an additive capable of improving certain properties of the battery cell, such as an additive for improving the overcharge / quick charge performance of the battery cell, an additive for improving the high-temperature performance of the battery cell, an additive for improving the low-temperature performance of the battery cell, etc.

[0115] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0116] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0117] As an example, the polymer of the polymer solid electrolyte may include polyether polyethylene oxide, polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, polyionic liquid, cellulose, etc.

[0118] As an example, the inorganic solid electrolyte may be an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor lithium germanium phosphorus sulfur, thiargillite, amorphous sulfide, and one or more of halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes).

[0119] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to the polymer solid electrolyte.

[0120] The electrode assembly may be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0121] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0122] In some embodiments, the electrode assembly has a laminated structure.

[0123] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0124] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple folded segments arranged in a stacked manner, and a positive electrode sheet is clamped between adjacent folded segments.

[0125] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple folded segments arranged in a stacked manner.

[0126] As an example, multiple separators can be provided and are respectively arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0127] As an example, the separators can be continuously provided and are arranged between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0128] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, prismatic, etc.

[0129] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct the current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0130] In some embodiments, the battery cell can include a housing. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), or a composite metal shell (such as a copper-aluminum composite shell, etc.). In some embodiments, the housing can be a sealed structure or a non-sealed structure.

[0131] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery (the multi-prismatic battery is, for example, a hexagonal prism battery, etc.), and there is no particular limitation in this application.

[0132] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap covers the opening. The housing body can be provided with one or more openings. One or more end caps can also be provided.

[0133] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab or indirectly connected to the tab through a current collecting member. The electrode terminal can be provided on the end cap or on the housing body.

[0134] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to discharge the internal gas of the battery cell.

[0135] As an example, it is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is damaged, thereby forming an opening or a channel for releasing the internal pressure or temperature. The design of this threshold varies according to different design requirements. The threshold may depend on one or several materials among the positive electrode plate, negative electrode plate, electrolyte, and separator in the battery cell.

[0136] As an example, the pressure relief mechanism can be integrally formed with the outer shell.

[0137] As an example, the pressure relief mechanism can also be separately provided and connected to the outer shell.

[0138] The "actuation" mentioned in this application means that the pressure relief mechanism generates an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The actions generated by the pressure relief mechanism may include but are not limited to: the components in the pressure relief mechanism move to form an exhaust channel, at least a part of the pressure relief mechanism breaks, shatters, is torn or opened, and so on. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the actuated part as emissions. In this way, the battery cell can be depressurized and de-temperatureed under a controllable pressure or temperature, thus avoiding potential more serious accidents.

[0139] In some embodiments, when the outer shell is a non-sealed structure, the pressure relief mechanism can be set as a through hole for discharging the gas inside the battery cell.

[0140] The emissions from the battery cell mentioned in this application include but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, and so on.

[0141] For the convenience of description in the following embodiments, please refer to Figures 1-8 , and take a battery cell 1100 in some embodiments of this application as an example for description.

[0142] The battery cell 1100 includes an outer shell 20, a connecting member 40, and at least a pair of electrode assemblies 10. The outer shell 20 includes a bottom wall 22, a top wall 23, and a side wall 21. The bottom wall 22, the top wall 23, and the side wall 21 enclose a receiving cavity, and at least a pair of electrode assemblies 10 are located in the receiving cavity. The connecting member 40 is disposed between the same pair of electrode assemblies 10 and is respectively bonded to two different electrode assemblies 10 in the same pair of electrode assemblies 10.

[0143] The material of the connecting member 40 can be but is not limited to polyimide, polyether ether ketone, polyphenylene sulfide, or polyamideimide, etc.

[0144] The number of the connecting members 40 can be one or more.

[0145] The electrode assembly 10 can be a wound structure or a laminated structure.

[0146] The housing 20 can be, but is not limited to, a cylindrical housing or a square housing and other structures listed in the above embodiments.

[0147] The connecting member 40 can be a plate-like structure or a strip-like structure.

[0148] The electrode assembly 10 further includes a tab 12. The tab 12 is disposed at one end of the main body portion 11. A terminal post 60 is provided on the outer surface of the housing 20. The tab 12 can be electrically connected to the terminal post 60 through an adapter piece 70 or directly.

[0149] The connecting members 40 bond the same pair of electrode assemblies 10 together, which can reduce the misalignment generated by the same pair of electrode assemblies 10 during the welding of the tabs 12 and the process of loading the electrode assemblies 10 into the housing 20. Thus, after the tabs 12 are welded and the assemblies are inserted into the housing, the pulling force on the tabs 12 of the same pair of electrode assemblies 10 can be reduced, so as to reduce the cracking of the tabs 12 of the electrode assemblies 10 and improve the working reliability of the battery cell 1100.

[0150] In some embodiments, please refer to Figures 6A-6D , Figure 8 , the number of the connecting members 40 between the same pair of electrode assemblies 10 is multiple. The multiple connecting members 40 are spaced along a first direction X. The first direction X intersects with the thickness direction Z of the bottom wall. The plane where the first direction X and the thickness direction Z of the bottom wall are located together intersects with the arrangement direction of a pair of electrode assemblies 10.

[0151] As an example, the connecting member 40 can be a connecting bar. The connecting bars between the same pair of electrode assemblies 10 are spaced along the first direction X, and a flow channel 50 is formed between two adjacent connecting bars.

[0152] The multiple connecting members 40 are spaced along the first direction X. On the one hand, it can improve the bonding strength between the same pair of electrode assemblies 10 and reduce the possibility of misalignment. On the other hand, the flow channel 50 is formed between two adjacent connecting members 40, which can accelerate the infiltration rate of the electrolyte after the electrolyte is injected. During thermal runaway, it can conduct the gas on both sides of the electrode assembly 10 along the thickness direction Z of the bottom wall, reduce the possibility that the battery cell 1100 cannot release pressure in time due to excessive local pressure inside the housing 20, and improve the safety of the battery cell 1100.

[0153] In some embodiments, the number of the connecting members 40 is 2 - 4.

[0154] Thus, during the assembly process, it is possible to ensure a certain bonding strength for the same pair of electrode assemblies 10, and taking into account the usage amount of the connecting member 40, the number of the connecting members 40 is set to 2 - 4. In other examples, the number of the connecting members 40 can be more than 4, and can be specifically determined according to the size of the electrode assembly 10.

[0155] In some embodiments, please refer to Figure 7 and Figure 8 , the electrode assembly 10 includes multiple pairs, and the multiple pairs of electrode assemblies 10 are arranged along the second direction Y, the second direction Y is the same as the arrangement direction of the same pair of electrode assemblies 10, and a connecting member 40 is provided between adjacent two pairs of electrode assemblies 10.

[0156] Thus, during the process of inserting into the housing, the possibility of misalignment between adjacent two pairs of electrode assemblies 10 can be reduced, so as to reduce the damage of the electrode assembly 10.

[0157] In some embodiments, please refer to Figure 7 and Figure 8 , the connecting member 40 between adjacent two pairs of electrode assemblies 10 is the first connecting member 41, the number of the first connecting members 41 is multiple, the connecting member 40 between the same pair of electrode assemblies 10 is the second connecting member 42, along the second direction Y, the orthographic projection of the second connecting member 42 on the side wall 21 is located between the orthographic projections of adjacent two first connecting members 41 on the side wall 21.

[0158] A connecting member 40 can be provided between the side wall 21 and the electrode assembly 10 ( Figure 7 and Figure 8 ), or a connecting member 40 can be not provided.

[0159] When the number of the first connecting members 41 is more than three, along the first direction X, it can be that the second connecting member 42 is provided between some adjacent two first connecting members 41, and the second connecting member 42 is not provided between the remaining adjacent two first connecting members 41, or it can be that the second connecting member 42 is provided between any adjacent two first connecting members 41. For example, the dimension of the second connecting member 42 along the first direction X can be the same as the dimension of the first connecting member 41 along the first direction X, or can be smaller or larger than the dimension of the first connecting member 41 along the first direction X, and can be specifically designed according to actual requirements.

[0160] Thus, the second connecting member 42 and the first connecting member 41 can be staggered. After inserting into the housing, the electrode assembly 10 is more easily compressed. Compared with the case where the second connecting member 42 and the first connecting member 41 are arranged side by side, the occupied space of the electrode assembly 10 in the housing 20 can be increased, so as to improve the volumetric energy density.

[0161] In some embodiments, please refer to Figures 6A-6D, a connecting member 40 is provided between the side wall 21 and the electrode assembly 10. The connecting member 40 between the side wall 21 and the electrode assembly 10 is the third connecting member 43, and the side wall 21 and the third connecting member 43 jointly define a flow channel 50.

[0162] The side wall 21 can be one or multiple. For example, the side wall 21 can be more than four. For example, the side wall 21 is a square wall.

[0163] The connecting member 40 between the side wall 21 and the electrode assembly 10 can be connected to the side wall 21, such as by bonding or integrally formed, or it can be not connected to both the side wall 21 and the electrode assembly 10. For example, a bottom support plate is provided between the electrode assembly 10 and the bottom wall 22, and the connecting member 40 is connected to the bottom support plate.

[0164] The connecting member 40 between the side wall 21 and the electrode assembly 10 can be one or multiple. For example, the connecting member 40 between the side wall 21 and the electrode assembly 10 is one, and the two side edges of the connecting member 40 along the first direction X are part of the wall of the flow channel 50.

[0165] When the battery cell 1100 is in thermal runaway, a large amount of gas will be generated on both sides of the electrode assembly 10 along the thickness direction Z of the bottom wall. The flow channel 50 connects the gas on both sides of the electrode assembly 10 to reduce the situation of excessive local pressure in the housing 20, thereby improving the safety of the battery cell 1100.

[0166] In some embodiments, please refer to Figures 6B-6D , the side wall 21 includes two first side walls 211. The two first side walls 211 are arranged at intervals along the arrangement direction of a pair of electrode assemblies 10. At least one first side wall 211 is provided with a plurality of third connecting members 43 between it and the electrode assembly 10, and the plurality of third connecting members 43 are arranged at intervals along the first direction X.

[0167] The connecting member 40 between the same pair of electrode assemblies 10 is the second connecting member 42. Figure 6B The structure in which a plurality of second connecting members 42 and a plurality of third connecting members 43 are arranged side by side is illustrated. Figure 6C The structure in which a second connecting member 42 is provided between two adjacent third connecting members 43 along the first direction X is illustrated.

[0168] A plurality of connecting members 40 can form a plurality of flow channels 50 to increase the exhaust path, thereby improving the reliability of the operation of the flow channel 50.

[0169] In some embodiments, please refer to Figure 6C and Figure 6D, the connecting member 40 between the same pair of electrode assemblies 10 is the second connecting member 42. Along the second direction Y, the orthographic projection of the second connecting member 42 on the side wall 21 is located between the orthographic projections of two adjacent third connecting members 43 on the side wall 21. The second direction Y is the same as the arrangement direction of the same pair of electrode assemblies 10.

[0170] Thus, the second connecting member 42 and the third connecting member 43 can be staggered, making it easier to compress the electrode assembly 10 into the housing during the process of inserting the electrode assembly 10 into the housing, and increasing the occupied space of the electrode assembly 10 in the outer housing 20.

[0171] In some embodiments, please refer to FIG. 6 and Figure 7 , the electrode assembly 10 includes multiple pairs, and the multiple pairs of electrode assemblies 10 are arranged along the second direction Y. A connecting member 40 is provided between two adjacent pairs of electrode assemblies 10.

[0172] Thus, during the process of inserting into the housing, the possibility of misalignment between two adjacent pairs of electrode assemblies 10 can be reduced, so as to reduce the damage to the electrode assembly 10.

[0173] In some embodiments, please refer to FIG. 6 and Figure 7 , the connecting member 40 between two adjacent pairs of electrode assemblies 10 is the first connecting member 41. The number of the first connecting members 41 is multiple, and the multiple first connecting members 41 are arranged at intervals along the first direction X.

[0174] Thus, the connection strength between two adjacent pairs of electrode assemblies 10 can be increased, so as to reduce the misalignment between adjacent electrode assemblies 10 during insertion into the housing, thereby reducing the damage to the electrode assembly 10 during the assembly process.

[0175] In some embodiments, please refer to Figure 7 and Figure 8 , along the second direction Y, the orthographic projection of the second connecting member 42 on the side wall 21 is located between the orthographic projections of two adjacent first connecting members 41 on the side wall 21.

[0176] Thus, during the process of inserting the electrode assembly 10 into the housing, the electrode assembly 10 can be more easily compressed into the housing, and the occupied space of the electrode assembly 10 in the outer housing 20 is increased.

[0177] In some embodiments, please refer to Figures 6D-8 , the side wall 21 further includes two second side walls 212. The two second side walls 212 are arranged at intervals along the first direction X. At least one connecting member 40 is provided between the second side wall 212 and the electrode assembly 10.

[0178] Thus, the number of the flow channels 50 can be further increased to reduce the probability that the gases on both sides of the electrode assembly 10 cannot conduct due to the blockage of some of the flow channels 50 by the expanded electrode assembly 10 during thermal runaway, so that the pressure inside the housing 20 is more balanced, which is beneficial to improving the safety of the battery cell 1100.

[0179] In some embodiments, the connecting member 40 is a connecting strip extending along the thickness direction Z of the bottom wall.

[0180] In one example, the connecting member 40 can be a flat connecting strip.

[0181] The connecting strip can reduce the bonding area and save the use of materials.

[0182] In some embodiments, please refer to Figure 5 , the electrode assembly 10 includes a main body portion 11. Along the thickness direction Z of the bottom wall, the size of the main body portion 11 is H, and the size of the connecting member 40 is L, where L = (1 / 3 - 2 / 3) * H.

[0183] Thus, on the one hand, a certain length of the connecting member 40 can be ensured to ensure the connection strength. When the number of the connecting members 40 is multiple, the length of the flow channels 50 between two adjacent connecting members 40 can be ensured to improve the infiltration effect during the liquid injection process.

[0184] In some embodiments, please refer to Figure 6A , the size of the connecting member 40 along the first direction X is W. The first direction X intersects with the thickness direction Z of the bottom wall, and the plane where the first direction X and the thickness direction Z of the bottom wall are located together intersects with the arrangement direction of a pair of electrode assemblies 10. The value range of W is 10 mm - 20 mm.

[0185] Thus, a certain supporting area for the electrode assembly 10 can be provided to reduce the extrusion force between the electrode assemblies 10 and lower the stress concentration between the electrode assemblies 10.

[0186] In some embodiments, please refer to Figure 4 , the electrode assembly 10 includes a main body portion 11. The distance from the end of the connecting member 40 facing the top wall 23 to the top wall 23 is less than or equal to the distance from the main body portion 11 to the top wall 23. The end of the connecting member 40 facing the bottom wall 22 is flush with the bottom of the main body portion 11, or the end of the connecting member 40 facing the bottom wall 22 is lower than the bottom of the main body portion 11.

[0187] Thus, the length of the flow channels 50 can be prevented from being too short. During thermal runaway of the battery cell 1100, the possibility that the flow channels 50 are blocked due to the expansion of the electrode assembly 10 can be reduced, so that the flow channels 50 can connect the gases on both sides of the main body portion 11 along the thickness direction Z of the bottom wall, to reduce the situation of excessive local pressure inside the housing 20 and improve the safety of the battery cell 1100.

[0188] In some embodiments, please refer to Figure 5 , along the thickness direction Z of the bottom wall, the dimension of the main body portion 11 is H, the dimension of the connecting member 40 is L, and the value range of L - H is 2 mm - 5 mm.

[0189] Thus, when the battery cell 1100 is in thermal runaway, the possibility that the flow channel 50 is blocked due to the expansion of the electrode assembly 10 is further reduced, and the working reliability of the flow channel 50 is improved.

[0190] In some embodiments, please refer to Figure 6A , the connecting member 40 is of a flat structure, and the thickness direction of the connecting member 40 is the same as the arrangement direction of the pair of electrode assemblies 10.

[0191] Thus, the space occupied by the connecting member 40 in the housing 20 can be reduced, so as to improve the space utilization rate inside the housing 20, and enable the battery cell 1100 to have a certain volumetric energy density.

[0192] In some embodiments, please refer to Figure 6A , the thickness of the connecting member 40 is s, and the value range of s is 0.1 mm - 0.5 mm.

[0193] Thus, the space occupied by the connecting member 40 in the housing 20 can be reduced, so as to improve the space utilization rate inside the housing 20; at the same time, the relatively thin design of the connecting member 40 can reduce the extrusion force on the electrode assembly 10 after being inserted into the housing, so as to reduce the stress concentration of the electrode assembly 10.

[0194] In some embodiments, please refer to Figure 1 and Figure 5 , the battery cell 1100 further includes a pressure relief mechanism 30, and the pressure relief mechanism 30 is arranged on the bottom wall 22 or the top wall 23. The pressure relief mechanism 30 is used to actuate when the battery cell 1100 is in thermal runaway and the pressure inside the housing 20 reaches a set value, so as to release the emissions.

[0195] The pressure relief mechanism 30 can be an explosion-proof valve, or a weak area formed by scoring on the top wall 23 or the bottom wall 22 of the housing 20. For example, a circular score is set on the top wall 23 or the bottom wall 22. When the pressure reaches the set value, the weak area formed by the circular score is first damaged to release the pressure inside the housing 20.

[0196] Thus, the setting of the flow channel 50 can make the pressure inside the battery cell 1100 more uniform, so as to reduce the situation that the pressure relief mechanism 30 cannot be opened in time due to local pressure unevenness inside the battery cell 1100, thereby improving the safety of the battery cell 1100.

[0197] For the convenience of description in the following embodiments, please refer to Figure 9, taking a battery device 100 according to some embodiments of the present application as an example for illustration.

[0198] The battery device 100 includes a box body 120 and a battery cell assembly 110. The box body 120 has a receiving space, and the battery cell assembly 110 is located in the receiving space. The battery cell assembly 110 includes a plurality of battery cells 1100 of the above embodiments.

[0199] The battery cell assembly 110 can be one or more. Each battery cell assembly 110 includes a plurality of battery cells 1100 arranged in a row.

[0200] The box body 120 may include a first box body 121 and a second box body 122. The first box body 121 and the second box body 122 are buckled with each other and jointly define the receiving space.

[0201] Since the battery device 100 includes all the technical features of the battery cell 1100 of the above embodiments, the effects are the same as those above and will not be elaborated here.

[0202] For the convenience of description in the following embodiments, an electrical device according to some embodiments of the present application is taken as an example for illustration.

[0203] The electrical device includes the battery device 100 of the above embodiments, and the battery device 100 is used to provide electrical energy to the electrical device.

[0204] The electrical device can be, but is not limited to, an electric vehicle, an electric tool, a vehicle 1000, a ship, a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.

[0205] Please refer to Figure 10 , Figure 10 , which is a schematic structural diagram of a vehicle 1000 provided by 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. The battery device 100 is disposed inside the vehicle 1000, and the battery device 100 can be disposed at the bottom, the head or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation and driving of the vehicle 1000.

[0206] Since the electrical device includes all the technical features of the battery device 100 of the above embodiments, the effects are the same as those above and will not be elaborated here.

[0207] In a specific optional embodiment of the battery cell 1100, please refer to Figures 1-4 , Figure 7 and Figure 8 , the battery cell 1100 includes a housing 20, a pressure relief mechanism 30, a connecting member 40, and at least a pair of electrode assemblies 10. The housing 20 includes a bottom wall 22, a top wall 23, and a side wall 21. The bottom wall 22, the top wall 23, and the side wall 21 enclose a receiving cavity, and multiple pairs of electrode assemblies 10 are located in the receiving cavity. The pressure relief mechanism 30 is disposed on the bottom wall 22 or the top wall 23, and the pressure relief mechanism 30 is configured to actuate when the battery cell 1100 is in thermal runaway and the pressure inside the housing 20 reaches a set value to release emissions. A plurality of connecting members 40 are adhesively bonded between the same pair of electrode assemblies 10 and between adjacent pairs of electrode assemblies 10 respectively. The plurality of connecting members 40 between the same pair of electrode assemblies 10 are spaced along a first direction X. The plurality of connecting members 40 between adjacent pairs of electrode assemblies 10 are spaced along the first direction X. The first direction X intersects with the thickness direction Z of the bottom wall. The plane where the first direction X and the thickness direction Z of the bottom wall are located together intersects with the arrangement direction of a pair of electrode assemblies 10. The side wall 21 includes a first side wall 211 and a second side wall 212. Among them, the two first side walls 211 are spaced along the arrangement direction of a pair of electrode assemblies 10. A plurality of connecting members 40 are provided between each first side wall 211 and the electrode assembly 10. The connecting member 40 between adjacent pairs of electrode assemblies 10 is a first connecting member 41, the connecting member 40 between the same pair of electrode assemblies 10 is a second connecting member 42, and the connecting member 40 between the side wall 21 and the electrode assembly 10 is a third connecting member 43. The plurality of first connecting members 41 are spaced along the first direction X. Along a second direction Y, along the second direction Y, the orthographic projection of the second connecting member 42 on the side wall 21 is located between the orthographic projections of two adjacent first connecting members 41 on the side wall 21, and the orthographic projection of the second connecting member 42 on the side wall 21 is located between the orthographic projections of two adjacent third connecting members 43 on the side wall 21. A second connecting member 42 is provided between two adjacent third connecting members 43. The connecting member 40 is a flat connecting strip extending along the thickness direction Z of the bottom wall. The electrode assembly 10 includes a main body portion 11. Along the thickness direction Z of the bottom wall, the size of the main body portion 11 is H, and the size of the connecting member 40 is L. L = (1 / 3 - 2 / 3) * H; or, the distance from the end of the connecting member 40 facing the top wall 23 to the top wall 23 is less than or equal to the distance from the main body portion 11 to the top wall 23, the end of the connecting member 40 facing the bottom wall 22 is flush with the bottom of the main body portion 11, or the end of the connecting member 40 facing the bottom wall 22 is lower than the bottom of the main body portion 11, and the value range of L - H is 2 mm - 5 mm. The size of the connecting member 40 along the first direction X is W, and the value range of W is 10 mm - 20 mm. The thickness of the connecting member 40 is s, and the value range of s is 0.1 mm - 0.5 mm.

[0208] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: At least a pair of electrode assemblies; A housing, including a bottom wall, a top wall and side walls, the bottom wall, the top wall and the side walls enclosing a receiving cavity, and the at least a pair of electrode assemblies being located in the receiving cavity; A connecting member, disposed between the two electrode assemblies of the same pair and adhesively connected to two different electrode assemblies of the same pair respectively.

2. The battery cell according to claim 1, wherein The number of the connecting members between the two electrode assemblies of the same pair is multiple, and the multiple connecting members are spaced along a first direction, the first direction intersecting with the thickness direction of the bottom wall, and the plane where the first direction and the thickness direction of the bottom wall are located together intersecting with the arrangement direction of a pair of electrode assemblies.

3. The battery cell according to claim 2, characterized in that, There are multiple pairs of the electrode assemblies, and the multiple pairs of electrode assemblies are arranged along a second direction, the second direction being the same as the arrangement direction of the two electrode assemblies of the same pair, and a connecting member being provided between adjacent two pairs of electrode assemblies.

4. The battery cell according to claim 3, wherein The number of the connecting members between adjacent two pairs of electrode assemblies is multiple, the connecting members between adjacent two pairs of electrode assemblies are first connecting members, the connecting members between the two electrode assemblies of the same pair are second connecting members, and along the second direction, the orthographic projection of the second connecting member on the side wall is located between the orthographic projections of two adjacent first connecting members on the side wall.

5. The battery cell according to claim 2, wherein A connecting member is provided between the side wall and the electrode assembly, the connecting member between the side wall and the electrode assembly is a third connecting member, and the side wall and the third connecting member jointly define a flow channel.

6. The battery cell according to claim 5, characterized in that, The side wall includes two first side walls, the two first side walls being spaced along the arrangement direction of a pair of electrode assemblies, and multiple third connecting members being provided between at least one of the first side walls and the electrode assembly, the multiple third connecting members being spaced along the first direction.

7. The battery cell according to claim 6, wherein The connecting member between the two electrode assemblies of the same pair is a second connecting member, and along the second direction, the orthographic projection of the second connecting member on the side wall is located between the orthographic projections of two adjacent third connecting members on the side wall, and the second direction is the same as the arrangement direction of the two electrode assemblies of the same pair.

8. The battery cell according to claim 7, characterized in that There are multiple pairs of the electrode assemblies, and the multiple pairs of electrode assemblies are arranged along a second direction, and a connecting member is provided between adjacent two pairs of electrode assemblies.

9. The battery cell according to claim 8, wherein, The connecting members between adjacent two pairs of electrode assemblies are first connecting members, the number of the first connecting members is multiple, and the multiple first connecting members are spaced along the first direction.

10. The battery cell according to claim 9, characterized in that, Along the second direction, the orthographic projection of the second connecting member on the side wall is located between the orthographic projections of two adjacent first connecting members on the side wall.

11. The battery cell according to any one of claims 6-10, characterized in that, The side wall further includes two second side walls, the two second side walls being spaced along the first direction, and at least one connecting member being provided between the second side wall and the electrode assembly.

12. The battery cell according to any one of claims 6-10, characterized in that, The connecting member is a connecting bar extending along the thickness direction of the bottom wall.

13. The battery cell according to claim 12, wherein, The electrode assembly includes a main body portion, and along the thickness direction of the bottom wall, the size of the main body portion is H, the size of the connecting member is L, and L = (1 / 3 - 2 / 3) * H.

14. The battery cell according to claim 1, characterized in that, The dimension of the connecting member in the first direction is W. The first direction intersects with the thickness direction of the bottom wall, and the plane where the first direction and the thickness direction of the bottom wall are located together intersects with the arrangement direction of a pair of the electrode assemblies. The value range of W is 10 mm - 20 mm.

15. The battery cell according to any one of claims 1-10, characterized in that, The electrode assembly includes a main body portion. The distance from the end of the connecting member facing the top wall to the top wall is less than or equal to the distance from the main body portion to the top wall. The end of the connecting member facing the bottom wall is flush with the bottom of the main body portion, or the end of the connecting member facing the bottom wall is lower than the bottom of the main body portion.

16. The battery cell according to claim 15, characterized in that, In the thickness direction of the bottom wall, the dimension of the main body portion is H, and the dimension of the connecting member is L. The value range of L - H is 2 mm - 5 mm.

17. The battery cell according to any one of claims 1-10, characterized in that, The connecting member is of a flat structure, and the thickness direction of the connecting member is the same as the arrangement direction of a pair of the electrode assemblies.

18. The battery cell according to claim 17, characterized in that, The thickness of the connecting member is s, and the value range of s is 0.1 mm - 0.5 mm.

19. The battery cell according to any one of claims 1-10, characterized in that, The battery cell further includes a pressure relief mechanism. The pressure relief mechanism is disposed on the bottom wall or the top wall and is used to actuate when the battery cell is in thermal runaway and the pressure in the outer shell reaches a set value to release emissions.

20. A battery device, characterized in that, Comprising: A box body having an accommodation space; A battery cell assembly located in the accommodation space, and the battery cell assembly includes a plurality of battery cells as described in any one of claims 1 - 19.

21. An electrical device, characterized in that, Including the battery device as described in claim 20, and the battery device is used to supply electric energy to the electrical equipment.

Images