Battery cell, battery device, energy storage device, energy storage system and charging network

Abstract

The embodiment of the utility model provides a battery monomer, a battery device, an energy storage device, an energy storage system and a charging network, the battery monomer comprises a shell, an electrode assembly and a first electrode terminal, the electrode assembly is arranged in an accommodating cavity of the shell and comprises a main body part and a plurality of first tab clusters with the same polarity, the plurality of first tab clusters are connected to the same side of the main body part along the first direction; the first electrode terminal comprises a first terminal main body and a first connecting piece, the first terminal main body is arranged on the shell, is electrically connected with the first connecting piece and comprises a first connecting part and a second connecting part which are at least partially arranged at intervals, and a part of the first tab cluster is electrically connected with the first connecting part; and the other part of the first tab cluster is electrically connected with the second connecting part. According to the invention, the cost can be reduced while the energy density of the battery monomer is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery monomer, a battery device, an energy storage device, an energy storage system and a charging network. BACKGROUND

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes and electric tools, etc. The battery monomers can include cadmium-nickel battery monomers, hydrogen-nickel battery monomers, ion battery monomers and secondary alkaline zinc-manganese battery monomers, etc.

[0003] In the development of battery technology, how to balance the energy density and cost of the battery monomer is a technical problem that needs to be solved in the battery technology. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery monomer, a battery device, an energy storage device, an energy storage system and a charging network, which can improve the energy density of the battery monomer while reducing the cost.

[0005] In a first aspect, the present application provides a battery monomer, comprising: a shell having a receiving cavity; an electrode assembly arranged in the receiving cavity, the electrode assembly comprising a main body part and a plurality of first tab clusters of the same polarity, the plurality of first tab clusters are all connected to the same side of the main body part along a first direction; a first electrode terminal comprising a first terminal main body and a first connecting piece, the first terminal main body is arranged in the shell and electrically connected with the first connecting piece, the first connecting piece comprises a first connecting part and a second connecting part, the first connecting part and the second connecting part are at least partially spaced apart; wherein a part of the first tab clusters are electrically connected with the first connecting part, and another part of the first tab clusters are electrically connected with the second connecting part.

[0006] In some embodiments of the first aspect, by arranging the electrode assembly to comprise a plurality of first tab clusters, the occupied space of the plurality of first tab clusters in the first direction after being bent can be reduced, thereby facilitating the improvement of the energy density of the battery monomer, and by arranging the first connecting piece to comprise a first connecting part and a second connecting part which are at least partially spaced apart, the use of materials and the weight of the first connecting piece can be reduced on the basis of the electrical connection between the first connecting piece and the plurality of first tab clusters, thereby facilitating the reduction of the cost of the battery monomer.

[0007] In some embodiments, in the same projection plane perpendicular to the first direction, the orthogonal projections of the plurality of first tab clusters are arranged staggeredly.

[0008] In the above technical solution, the assembly of the first tab clusters and the first connecting piece is facilitated, and the risk of interference between the plurality of first tab clusters is effectively reduced.

[0009] In some embodiments, the plurality of electrode assemblies are arranged along a second direction, the first connecting part and the second connecting part are at least partially spaced apart along the second direction, and the first direction intersects the second direction.

[0010] In this way, the layout is reasonable, and the performance and cost of the battery monomer can be considered at the same time.

[0011] In some embodiments, the plurality of first tab clusters in each electrode assembly are arranged along a third direction, and the first direction, the second direction, and the third direction intersect each other; and / or, the plurality of electrode assemblies include a first electrode assembly and a second electrode assembly, the plurality of first tab clusters in the first electrode assembly are electrically connected to the first connecting part, and the plurality of first tab clusters in the second electrode assembly are electrically connected to the second connecting part.

[0012] In this way, the layout is reasonable, and the assembly of the battery monomer is facilitated.

[0013] In some embodiments, the first connecting part further includes a first adapter part, the first adapter part is connected to the first connecting part and the second connecting part respectively, the first connecting part and the second connecting part are spaced apart along a second direction, and the first connecting part, the second connecting part, and the first adapter part enclose at least one first gap through in the first direction, and the first direction intersects the second direction.

[0014] In this way, the layout is reasonable, and the processing and forming of the connecting part are facilitated.

[0015] In some embodiments, the first electrode terminal is electrically connected to the first adapter part.

[0016] In this way, the layout is reasonable, and the possibility of stress concentration of the first connecting part is reduced.

[0017] In some embodiments, the first adapter part is connected to the same side of the first connecting part and the second connecting part along a third direction; or, the first adapter part is connected to opposite sides of the first connecting part and the second connecting part along the third direction; the first direction, the second direction, and the third direction intersect each other.

[0018] In the above technical solution, the first connecting part can be set to the above structure to improve the energy density of the battery monomer while reducing the cost of the battery monomer.

[0019] In some embodiments, a minimum dimension of the first connecting portion in the second direction is L1, a minimum dimension of the second connecting portion in the second direction is L2, and a minimum dimension of the first adapter portion in the third direction is D, wherein 0.06≤L1 / D≤5 and / or 0.06≤L2 / D≤5, and the first direction, the second direction, and the third direction are mutually perpendicular.

[0020] In the above technical solution, the connection strength of the first connecting member with the first terminal body and the electrode assembly can be improved, and the performance of the battery monomer can be improved.

[0021] In some embodiments, 0.32≤L1 / D≤1.6 and / or 0.32≤L2 / D≤1.6.

[0022] In the above technical solution, the connection strength of the first connecting member with the first terminal body and the electrode assembly can be improved, and the performance of the battery monomer can be improved.

[0023] In some embodiments, in the same projection plane perpendicular to the first direction, the orthographic projection of the first connecting member is any one of an H type, an X type, an N type, a U type, a V type, and an A type; or in the same projection plane perpendicular to the first direction, the orthographic projection of the first connecting member is a hollow ring structure.

[0024] In the above technical solution, the shape of the first connecting member can be set to any one of the above structures, which is beneficial to improve the processing flexibility of the first connecting member, thereby facilitating the diversity of the battery monomer.

[0025] In some embodiments, the shell includes a cover and a housing, the housing has a receiving cavity and an opening communicating with the receiving cavity, the cover is arranged at the opening, and the first electrode terminal is arranged on the cover.

[0026] In the above technical solution, the layout is reasonable, and connection and assembly are facilitated.

[0027] In some embodiments, the electrode assembly further includes a plurality of second tab clusters of the same polarity, the polarity of the first tab cluster is opposite to that of the second tab cluster, and the plurality of second tab clusters are connected to the same side of the body portion along the first direction; the battery monomer further includes a second electrode terminal, the second electrode terminal includes a second terminal body and a second connecting member, the second terminal body is arranged in the shell and electrically connected to the second connecting member, and the plurality of second tab clusters are electrically connected to the second connecting member.

[0028] In the above technical solution, by arranging the electrode assembly to include a plurality of second tab clusters, the occupied space of the plurality of second tab clusters in the first direction after being bent can be reduced, thereby facilitating the improvement of the energy density of the battery monomer.

[0029] In some embodiments, the second connecting member comprises a third connecting portion and a fourth connecting portion, the third connecting portion and the fourth connecting portion are at least partially spaced apart, a part of the second tab clusters are electrically connected to the third connecting portion, and another part of the second tab clusters are electrically connected to the fourth connecting portion; and / or, the second connecting member and the second terminal body are in an integrated structure.

[0030] In the above technical solution, by arranging the second connecting member to comprise the third connecting portion and the fourth connecting portion which are at least partially spaced apart, the second connecting member can be reduced in material and weight on the basis of being electrically connected to the plurality of first tab clusters, thereby facilitating the reduction of the cost of the battery monomer.

[0031] In some embodiments, in the same projection plane perpendicular to the first direction, the projections of the plurality of second tab clusters are arranged to be staggered with each other.

[0032] In the above technical solution, the assembly of the second tab clusters and the second connecting member is facilitated, and the risk of interference between the plurality of second tab clusters is effectively reduced.

[0033] In some embodiments, the plurality of first tab clusters and the plurality of second tab clusters are connected to the same side of the main body portion along the first direction.

[0034] In the above technical solution, the occupied space of the plurality of first tab clusters and the plurality of second tab clusters in the first direction after being bent can be reduced, thereby facilitating the improvement of the energy density of the battery monomer.

[0035] In a second aspect, the present application provides a battery device comprising the battery monomer according to any one of the embodiments of the first aspect.

[0036] In a third aspect, the present application provides an energy storage device comprising a plurality of battery monomers according to any one of the embodiments of the first aspect or a plurality of battery devices according to any one of the embodiments of the second aspect, the battery monomers or the battery devices are used for storing or providing electric energy.

[0037] In a fourth aspect, the present application provides an energy storage system comprising a power conversion device and an energy storage device according to any one of the embodiments of the third aspect, the power conversion device is used for electrically connecting a power generation device and the energy storage device.

[0038] In a fifth aspect, the present application provides a charging network comprising a charging pile and an energy storage device according to any one of the embodiments of the third aspect or an energy storage system according to any one of the embodiments of the fourth aspect, the energy storage device is used for providing electric energy for the charging pile.

[0039] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear and understandable, and to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following will give a specific embodiment of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the drawings.

[0041] Figure 1 A structural schematic diagram of a charging network in some embodiments of the present application;

[0042] Figure 2 A structural schematic diagram of an energy storage system in some embodiments of the present application;

[0043] Figure 3 A structural schematic diagram of an energy storage device in some embodiments of the present application;

[0044] Figure 4 A structural schematic diagram of a battery cell assembly provided in some embodiments of the present application;

[0045] Figure 5 An exploded structural schematic diagram of a battery device provided in some embodiments of the present application;

[0046] Figure 6 An exploded structural schematic diagram of a battery cell provided in some embodiments of the present application;

[0047] Figure 7 A partial exploded structural schematic diagram of a shell in a battery cell provided in some embodiments of the present application;

[0048] Figure 8 A partial structural schematic diagram of a battery cell in an assembly process provided in some embodiments of the present application;

[0049] Figure 9 A partial structural schematic diagram of a battery cell in an assembly process provided in some embodiments of the present application;

[0050] Figure 10 A partial structural schematic diagram of a battery cell in an assembly process provided in some embodiments of the present application;

[0051] Figure 11 A partial structural schematic diagram of a battery cell in an assembly process provided in some embodiments of the present application;

[0052] Figure 12 A partial structural schematic diagram of a battery monomer in an assembling process is provided for some embodiments of the present application;

[0053] Figure 13 A partial structural schematic diagram of a battery monomer in an assembling process is provided for some embodiments of the present application;

[0054] Figure 14 A partial structural schematic diagram of a battery monomer in an assembling process is provided for some embodiments of the present application;

[0055] Figure 15 A partial structural schematic diagram of a battery monomer in an assembling process is provided for some embodiments of the present application;

[0056] Figure 16 A partial structural schematic diagram of a battery monomer in an assembling process is provided for some embodiments of the present application;

[0057] Figure 17 A partial structural schematic diagram of a battery monomer in an assembling process is provided for some embodiments of the present application;

[0058] Figure 18 A partial structural schematic diagram of a battery monomer in an assembling process is provided for some embodiments of the present application.

[0059] Specific implementation of the figure mark is as follows:

[0060] 1000, charging network; 2000, energy storage system; 3000, power generation device;

[0061] 200, energy storage device; 210, energy storage box; 300, charging pile; 400, energy storage converter;

[0062] 100, battery device; 110, battery monomer assembly; 10, battery monomer; 20, battery box; 21, first box; 22, second box;

[0063] 11, shell; 101, containing cavity; 111, end cover; 112, shell body; 102, opening;

[0064] 12, electrode assembly; 1201, first electrode assembly; 1202, second electrode assembly; 121, main body part; 122, first tab cluster; 123, second tab cluster;

[0065] 13, first electrode terminal; 131, first terminal main body; 132, first connecting piece; 1321, first connecting part; 1322, second connecting part; 1323, first adapter part; 103, first notch;

[0066] 14. Second electrode terminal; 141, second terminal body; 142, second connecting member; 1421, third connecting portion; 1422, fourth connecting portion; 1423, second adapter portion; 104, second notch;

[0067] 15. Pressure relief mechanism;

[0068] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0069] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0070] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a specific order or primary and secondary relationship.

[0071] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0072] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect", "attach" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0073] The term "and / or" in the present application is only used to describe the relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0074] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0075] "Multiple" appearing in the present application means two or more (including two).

[0076] At present, from the development of market situation, the application of battery device is more and more extensive. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as aerospace and other fields. With the continuous expansion of the application field of battery device, the market demand is also increasing.

[0077] In the embodiments of the present application, the battery monomer can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging.

[0078] The battery monomer 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 hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0079] With the increasing demand for RTE (Round Trip Efficiency) performance, higher requirements are put forward for the internal resistance of the battery monomer. Although setting the electrode assembly in the battery monomer to one layer and one tab can effectively reduce the internal resistance, it is difficult to tightly fold when assembling due to the large number of tab layers, which requires a high tab folding space, greatly reducing the energy density of the battery monomer. If the tabs are set in a staggered manner, although the tab folding space can be effectively reduced, the staggered tabs will occupy the space in the length direction and the width direction of the battery monomer, thereby increasing the size of the electrode terminal connected to the tab to reduce the cost of the battery monomer.

[0080] To solve the above technical problems, the battery cell provided in the application comprises a shell, an electrode assembly, and a first electrode terminal. The shell has a receiving cavity, and the electrode assembly is arranged in the receiving cavity. The electrode assembly comprises a main body part and a plurality of first tab clusters with the same polarity, and the plurality of first tab clusters are all connected to the same side of the main body part along a first direction. The first electrode terminal comprises a first terminal main body and a first connecting piece. The first terminal main body is arranged in the shell and is electrically connected to the first connecting piece. The first connecting piece comprises a first connecting part and a second connecting part, and the first connecting part and the second connecting part are arranged at least partially spaced apart. One part of the first tab clusters is electrically connected to the first connecting part, and another part of the first tab clusters is electrically connected to the second connecting part.

[0081] By arranging the electrode assembly to comprise a plurality of first tab clusters, the occupied space of the plurality of first tab clusters in the first direction after being bent can be reduced, thereby facilitating the improvement of the energy density of the battery cell. By arranging the first connecting piece to comprise a first connecting part and a second connecting part arranged at least partially spaced apart, the first connecting piece can be reduced in material and weight on the basis of being electrically connected to the plurality of first tab clusters, thereby facilitating the reduction of the cost of the battery cell.

[0082] The technical solutions described in the embodiments of the application are applicable to various battery devices or energy storage containers or energy storage cabinets and other energy storage devices using battery cells.

[0083] Please refer to Figure 1 , Figure 3 and Figure 6 , Figure 1 a structural schematic diagram of a charging network 1000 provided in some embodiments of the application, Figure 3 a structural schematic diagram of an energy storage device 200 provided in some embodiments of the application, Figure 6 an exploded structural schematic diagram of a battery cell 10 provided in some embodiments of the application. The application provides a charging network 1000, which comprises a charging pile 300 for charging an electric device. The charging network 1000 can further comprise an energy storage device 200, which is electrically connected to the charging pile 300 and is used to provide electric energy for the charging pile 300.

[0084] It should be noted that the charging pile 300 and the battery cell 10 in the energy storage device 200 are electrically connected through a cable, and the battery cell 10 can provide the electric energy stored therein to the charging pile 300. The charging pile 300 has a connector, which can be connected to the electric device, so as to charge the electric device. The charging network 1000 applies the energy storage device 200, which can effectively improve the safety of the charging network 1000 and also helps to improve the flexibility of the charging network 1000 when deployed.

[0085] In one charging network 1000, the charging pile 300 can be one, and the energy storage device 200 provides power for the charging pile 300; the charging pile 300 can also be multiple, and the energy storage device 200 provides power for multiple charging piles 300.

[0086] As an example, as shown in Figure 1 , the charging network 1000 includes one energy storage device 200 and two charging piles 300, and one energy storage device 200 provides power for two charging piles 300.

[0087] As shown in Figure 3 , the energy storage device 200 can include a battery device 100, and the battery device 100 is electrically connected with the charging pile 300, so as to provide power for the charging pile 300.

[0088] Please refer to Figure 2 and Figure 3 , Figure 2 The structural schematic diagram of the energy storage system 2000 provided for some embodiments of the present application. The embodiment of the present application provides an energy storage system 2000. The energy storage system 2000 includes an energy storage converter 400, and the energy storage converter 400 can be electrically connected with a power generation device 3000 to convert the power provided by the power generation device 3000. The energy storage system 2000 can also include an energy storage device 200, and the energy storage device 200 is electrically connected with the energy storage converter 400, and the energy storage converter 400 guides the power provided by the power generation device 3000 to be stored in the energy storage device 200 after power conversion.

[0089] The power conversion device is used to connect between the power generation device 3000 and the energy storage device 200. The power generation device 3000 is used to generate power, and the power generation device 3000 is used to store the power generated by the power generation device 3000 to the energy storage device 200 through the power conversion device. The energy storage system 2000 applies the energy storage device 200, which can effectively improve the operation safety of the energy storage system 2000. In specific implementation, the power generation equipment can be a solar panel, a hydroelectric power generation equipment, a thermal power generation equipment, etc. Among them, the specific type of power generation equipment is not limited by the present application.

[0090] As an example, as shown in Figure 2 , the energy storage system 2000 includes an energy storage device 200 and an energy storage converter 400, and two power generation devices 3000 respectively transmit the generated power to the energy storage converter 400, and the power is guided into the energy storage device 200 through the energy storage converter 400 for storage.

[0091] As shown in Figure 3 , the energy storage device 200 includes an energy storage box 210, and the energy storage box 210 is provided with a battery device 100.

[0092] As an example, the energy storage device 200 can be an energy storage container, an energy storage cabinet, or the like.

[0093] As an example, the energy storage device 200 can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, or the like. The energy storage power station can store electric energy during the low electricity consumption period, and provide electric energy for related users or electric equipment during the peak electricity consumption period. The wind power generator set of the wind power system can collect wind energy and convert the wind energy into electric energy, which is stored by the energy storage device 200. The solar power system can convert solar energy into electric energy, which is stored by the energy storage device 200 and supplied to users in time. The mobile power system can supply electric energy for related electric equipment in places where the power grid supply system cannot reach, such as remote mountainous areas, remote wild areas, or the like. The temporary power supply system can supply electric energy for users in the case of insufficient power supply.

[0094] Please refer to Figure 4 , Figure 4 A structural schematic diagram of a battery cell assembly 110 provided for some embodiments of the present application. The battery apparatus 100 mentioned in the embodiments of the present application can include one or more battery cell assemblies 110 for providing voltage and capacity. The battery cell assembly 110 can include a plurality of battery cells 10 connected in series, in parallel, or in a mixed connection mode through a busbar component.

[0095] In some embodiments, the battery cell assembly 110 is generally formed by arranging a plurality of battery cells 10.

[0096] Please refer to Figure 5 , Figure 5 An exploded structural schematic diagram of a battery apparatus 100 provided for some embodiments of the present application. In some embodiments, the battery apparatus 100 can be a battery pack, which includes a battery box 20 and one or more battery cell assemblies 110 accommodated in the battery box 20.

[0097] As an example, the battery cell assembly 110 can be a battery module, and the battery cell assembly 110 can be accommodated in the battery box 20 by fixing the battery module in the battery box 20.

[0098] As an example, the battery cell assembly 110 can also be accommodated in the battery box 20 by directly fixing a plurality of battery cells 10 in the battery box 20.

[0099] As an example, the battery box 20 can include a first box 21 and a second box 22. The first box 21 and the second box 22 are fastened to form a cavity, so that an enclosed space is formed inside the battery box 20 to accommodate the battery cell assembly 110. The enclosed here means covered or closed, which can be sealed or unsealed. The first box 21 can be a top cover or a bottom plate.

[0100] As an example, the battery box 20 can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that an enclosed space is formed inside the battery box 20 to accommodate the battery cell assembly 110.

[0101] The battery box 20 can be a simple cuboid or a cylindrical body, or a complex cuboid or a cylindrical body composed of a simple cuboid or a cylindrical body, and the embodiments of the present application are not limited thereto.

[0102] Specifically, the battery box 20 can be a metal shell made of alloy steel, alloy aluminum or the like, or a composite material shell made of metal and polypropylene or the like.

[0103] As an example, the battery cell assembly 110 can be a battery module, which is formed by arranging and fixing a plurality of battery cells 10 into an independent module. As an example, the battery module can be formed by binding a plurality of battery cells 10 with a cable tie.

[0104] Please refer to Figure 6 , the battery cell 10 includes a shell 11 and an electrode assembly 12.

[0105] The shell 11 is a component for forming the internal environment of the battery cell 10, and the shell 11 has a receiving cavity 101 for receiving the electrode assembly 12, and also for receiving electrolyte and other components. Optionally, the shell 11 can be made of metal or non-metal materials, for example, the metal material can be copper, aluminum or stainless steel, etc.; the non-metal material can be polyethylene, polypropylene or polyvinyl chloride, etc.

[0106] For example, the shell 11 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0107] In some embodiments, the shell 11 can be a sealed structure or an unsealed structure. As an example, when the shell 11 is an unsealed structure, the shell 11 serves to protect the electrode assembly 12, and a sealing bag is further included between the shell 11 and the electrode assembly 12, which is used to package the electrode assembly 12 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the shell 11 is a sealed structure, it is used to package the electrode assembly 12 and the electrolyte, etc.

[0108] The shape of the shell 11 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cuboid structure, a cuboid shell can be selected; if the electrode assembly 12 is a cylindrical structure, a cylindrical shell can be selected.

[0109] The electrode assembly 12 is a component in which electrochemical reactions occur in the battery cell 10, and one or more electrode assemblies 12 can be contained in the shell 11.

[0110] In some embodiments, the shape of the electrode assembly 12 can be cylindrical, flat, or multi-prismatic, etc.

[0111] The electrode assembly 12 can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0112] The electrode assembly 12 includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell 10, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0113] Please continue to refer to Figure 6 , the battery cell 10 also includes a pressure relief mechanism 15. The pressure relief mechanism 15 is used to discharge the internal gas of the battery cell 10. The pressure relief mechanism 15 can be provided on the shell 11.

[0114] Please refer to Figures 6 to 9 , Figure 7 is a partial exploded structural schematic diagram of a battery cell 10 provided by some embodiments of the present application, Figure 8 is a partial structural schematic diagram of a battery cell 10 during assembly provided by some embodiments of the present application, Figure 9 is a partial structural schematic diagram of a battery cell 10 during assembly provided by some embodiments of the present application.

[0115] According to the embodiment of the present application, a battery monomer 10 is provided, comprising a shell 11, an electrode assembly 12 and a first electrode terminal 13. The shell 11 has a containing cavity 101. The electrode assembly 12 is arranged in the containing cavity 101, and the electrode assembly 12 comprises a main body part 121 and a plurality of first tab clusters 122 with the same polarity, the plurality of first tab clusters 122 are all connected to the same side of the main body part 121 along a first direction X, and the first electrode terminal 13 comprises a first terminal main body 131 and a first connecting piece 132, the first terminal main body 131 is arranged in the shell 11 and electrically connected with the first connecting piece 132, the first connecting piece 132 comprises a first connecting part 1321 and a second connecting part 1322, and the first connecting part 1321 and the second connecting part 1322 are at least partially arranged in a spaced manner. Among them, a part of the first tab clusters 122 are electrically connected with the first connecting part 1321, and another part of the first tab clusters 122 are electrically connected with the second connecting part 1322.

[0116] Among them, the first direction X can be the height direction of the battery monomer 10, or the width direction of the electrode assembly 12, for example, when the electrode assembly 12 is in a winding structure, the winding direction is the first direction X.

[0117] The first electrode terminal 13 is used to be electrically connected with the electrode assembly 12, so as to output or input the electric energy of the battery monomer 10. The electrode assembly 12 comprises the main body part 121 and the plurality of first tab clusters 122, the first tab cluster 122 refers to the structure state composed of a first tab after being bent, or the structure state composed of a plurality of first tabs after being bent and overlapped together, the first tab is the part extended from the main body part 121 along the first direction X, and the first tab can be a positive tab, accordingly, the first electrode terminal 13 is a positive electrode terminal, or the first tab can also be a negative tab, accordingly, the first electrode terminal 13 is a negative electrode terminal.

[0118] For example, the electrode assembly 12 can have N first tabs, N is greater than or equal to 2, and the N first tabs can be divided into two first tab clusters 122, one of which has M first tabs, M < N, and the other has N-M first tabs.

[0119] By arranging the electrode assembly 12 to comprise a plurality of first tab clusters 122, all the first tabs can be arranged without overlapping, so as to reduce the height of the plurality of first tabs after being bent, that is, to reduce the overall height of the plurality of first tab clusters 122 after being bent, which is the space occupied in the first direction X, so as to reduce the occupied space in the containing cavity 101 of the shell 11, and further to improve the energy density of the battery monomer 10.

[0120] It should be noted that if the electrode assembly only includes one first tab cluster, that is, all the first tabs are stacked together, the more layers will make it difficult to tightly fold, not only occupying space, but also greatly reducing the performance of the battery monomer. Therefore, by setting in the above manner, the assembly process difficulty of the first tabs in each first tab cluster 122 can be reduced, and by electrically connecting part of the first tab clusters 122 to the first connecting part 1321 and electrically connecting the other part of the first tab clusters 122 to the second connecting part 1322, the connection positions of the plurality of first tab clusters 122 can be staggered, which is beneficial to improve the heat dissipation problem at the first tab and better improve the performance of the battery monomer 10.

[0121] The first electrode terminal 13 includes a first terminal body 131 and a first connecting piece 132, the first connecting piece 132 is arranged in the accommodation cavity 101 and is used for electrically connecting with the first tab cluster 122, and the first terminal body 131 is arranged in the shell 11 and is used for electrically connecting with the first connecting piece 132. The side of the first terminal body 131 away from the first connecting piece 132 can be used for connecting with the busbar.

[0122] The "at least partially spaced apart between the first connecting part 1321 and the second connecting part 1322" means that the shape of the first connecting piece 132 is not a closed figure structure, but a structure with a notch to enable the first connecting part 1321 and the second connecting part 1322 to be spaced apart. The first connecting part 1321 and the second connecting part 1322 can be completely spaced apart, or they can be partially spaced apart. For example, the shape of the first connecting piece 132 can be any one of an H-shaped structure, an X-shaped structure, an N-shaped structure, a U-shaped structure, a V-shaped structure, or an A-shaped structure. Alternatively, the shape of the first connecting piece 132 can also be a hollow ring structure to reduce the material and weight of the first connecting piece 132. The hollow ring structure can include any one of an O-shaped structure, a B-shaped structure, and a D-shaped structure, and can also include other ring structures composed of straight lines.

[0123] The battery monomer 10 provided by some embodiments of the present application can reduce the occupied space of the plurality of first tab clusters 122 in the first direction X after being bent, facilitate folding of each first tab cluster 122, thereby improving the energy density of the battery monomer 10, and by setting the first connecting piece 132 to include the first connecting part 1321 and the second connecting part 1322 which are at least partially spaced apart, the first connecting piece 132 can reduce the material and weight on the basis of electrically connecting with the plurality of first tab clusters 122, thereby reducing the cost of the battery monomer 10.

[0124] It should be noted that the first connecting piece in the related art is usually a closed rectangular or circular structure, which needs to be lengthened along the arrangement direction of the plurality of first tab clusters 122 when cooperating with the plurality of first tab clusters 122, thereby increasing the weight and cost. However, in the embodiment of the present application, the first connecting piece 132 is provided in a special-shaped structure including at least partially spaced first connecting portions 1321 and second connecting portions 1322, so that the size of the plurality of first tab clusters 122 can be changed, and the position of the first connecting piece 132 not connected with the first tab clusters 122 and the first terminal body 131 can be made into a notched form, so that the first connecting portions 1321 and the second connecting portions 1322 are at least partially spaced, thereby improving the energy density of the battery monomer 10 while reducing the weight and cost of the battery monomer 10.

[0125] In addition, the position of the first connecting portions 1321 and the second connecting portions 1322 spaced apart can also improve the flow efficiency of the electrolyte between the electrode assemblies 12, which is beneficial to further improve the charge and discharge performance of the battery monomer 10.

[0126] Optionally, the projection edges of the two adjacent first tab clusters 122 are in contact, which can maximize the use of space on the electrode assembly 12, further increase the number of first tab clusters 122, reduce the height of each first tab cluster 122, and improve the use performance of the battery monomer 10.

[0127] Optionally, the connection mode of the first connecting piece 132 and the first terminal body 131 can be welding, riveting or adhesion by conductive glue, etc., as long as stable electrical connection can be achieved.

[0128] Optionally, the first electrode terminal 13 is connected to one side of the first connecting piece 132 along the first direction X, and the first tab cluster 122 is connected to the other side of the first connecting piece 132 along the first direction X, which is convenient for assembly. By this way, it is beneficial to reduce the possibility of interference between the first tab cluster 122 and the first terminal body 131, thereby improving the reliability of the battery monomer 10. In addition, by the above way, it is also convenient for the assembly of the battery monomer 10, which is beneficial to reduce the assembly difficulty and improve the assembly efficiency.

[0129] Optionally, the first connecting portion 1321 can be a straight line structure, and can also be a curved line structure. Optionally, the second connecting portion 1322 can be a straight line structure, and can also be a curved line structure.

[0130] Optionally, the first connecting portion 1321 and the second connecting portion 1322 can be respectively connected with the same number of first tab clusters 122, and of course, can also be respectively connected with different numbers of first tab clusters 122.

[0131] Optionally, the battery monomer 10 can comprise one electrode assembly 12, and of course, can comprise multiple electrode assemblies 12.

[0132] In some embodiments, the number of the first tab clusters 122 is less than the number of the first tabs.

[0133] That is, at least one of the first tab clusters 122 comprises multiple first tabs arranged in a stack, for example, the electrode assembly 12 has N first tabs, N is greater than 2, and the N first tabs can be divided into two first tab clusters 122, one of which has M first tabs, M < N, and the other has N-M first tabs, where M and N-M are both not equal to 1.

[0134] In this way, the number of the first tab clusters 122 can be reduced, which is convenient for layout and connection with the first connecting member 132.

[0135] In some embodiments, the projections of the multiple first tab clusters 122 are arranged staggered in the same projection plane perpendicular to the first direction X.

[0136] In this way, the overall height of the multiple first tab clusters 122 after being bent can be reduced, which is the space occupied in the first direction X, thereby reducing the occupied space in the accommodating cavity 101 of the shell 11, and thus improving the energy density of the battery monomer 10.

[0137] In some embodiments, the first connecting member 132 and the first terminal body 131 are an integral structure.

[0138] By integrally forming the first connecting member 132 and the first terminal body 131, the manufacturing efficiency can be improved, the processing cost can be reduced, the connection strength between the two can be improved, the overall structural strength of the first electrode terminal 13 can be improved, and the stability of the electrical connection and the reliability of the battery monomer 10 can be improved. In addition, the integral structure can also reduce the problem of increased resistance caused by poor connection between the first connecting member 132 and the first terminal body 131, and improve the conductivity and overall performance of the battery monomer 10.

[0139] Please refer to Figure 6 and Figure 8 In some embodiments, the electrode assembly 12 is provided in multiple, the multiple electrode assemblies 12 are arranged along the second direction Y, the first connecting portion 1321 and the second connecting portion 1322 are at least partially spaced apart along the second direction Y, and the first direction X and the second direction Y intersect.

[0140] In the present application, the second direction Y can be the width direction of the battery monomer 10, and the third direction Z can be the length direction of the battery monomer 10.

[0141] The number of the electrode assemblies 12 can be set to two, three, or even more. The plurality of electrode assemblies 12 are arranged along the second direction Y. The plurality of first tab clusters 122 in a part of the plurality of electrode assemblies 12 are electrically connected to the first connecting part 1321, and the plurality of first tab clusters 122 in another part of the plurality of electrode assemblies 12 are electrically connected to the second connecting part 1322, which facilitates the assembly of the battery monomer 10.

[0142] In the above manner, the first tab clusters 122 in each of the electrode assemblies 12 are connected to the first connecting part 1321 and the second connecting part 1322, which is reasonable in layout and facilitates assembly.

[0143] As shown in FIG. 1, Figure 8 In some embodiments, the plurality of first tab clusters 122 in each of the electrode assemblies 12 are arranged along the third direction Z, and the first direction X, the second direction Y, and the third direction Z intersect with each other.

[0144] In the above manner, the plurality of first tab clusters 122 arranged along the third direction Z in each of the electrode assemblies 12 are connected to the first connecting part 1321 or the second connecting part 1322, which is reasonable in layout and facilitates assembly.

[0145] As shown in FIG. 1, Figure 8 In some embodiments, the plurality of electrode assemblies 12 includes a first electrode assembly 1201 and a second electrode assembly 1202. The plurality of first tab clusters 122 in the first electrode assembly 1201 are electrically connected to the first connecting part 1321, and the plurality of first tab clusters 122 in the second electrode assembly 1202 are electrically connected to the second connecting part 1322.

[0146] The first electrode assembly 1201 and the second electrode assembly 1202 are arranged along the second direction Y, and the first connecting part 1321 and the second connecting part 1322 are at least partially spaced apart along the second direction Y. In the above connection manner, the plurality of first tab clusters 122 in the first electrode assembly 1201 located on one side along the second direction Y can be connected to the first connecting part 1321 on the same side along the second direction Y, respectively. Correspondingly, the plurality of first tab clusters 122 on the second electrode assembly 1202 located on the other side along the second direction Y can be connected to the second connecting part 1322 on the same side along the second direction Y, respectively. This facilitates the connection and assembly of the first connecting part 132 and the plurality of electrode assemblies 12, and also enables more precise current distribution, which is conducive to optimizing the charging and discharging process of the battery monomer 10, thereby improving the energy efficiency and cycle life of the battery monomer 10.

[0147] Therefore, by setting the first connecting member 132 to include the above-mentioned components to connect with the plurality of electrode assemblies 12, not only the structural stability of the battery monomer 10 can be improved, but also the electrochemical performance of the battery monomer 10 can be further optimized. In addition, by setting in the above-mentioned manner, the layout is reasonable, and the processing and forming of the first connecting member 132 are facilitated.

[0148] Please refer to Figures 8 to 18 , Figures 10 to 18 respectively are partial structural schematic diagrams of a battery monomer 10 in an assembly process provided in different embodiments of the present application. As shown in Figures 13 to 18 , in some embodiments, the first connecting member 132 can only include the first connecting part 1321 and the second connecting part 1322, and the first connecting part 1321 and the second connecting part 1322 are partially spaced apart.

[0149] Under this structure, when the first connecting part 1321 and the second connecting part 1322 are partially spaced apart along the second direction Y, the extension direction of at least one of the first connecting part 1321 and the second connecting part 1322 intersects the third direction Z.

[0150] For example, as shown in Figure 13 and Figure 14 , in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting member 132 can be an X-shaped structure, the first connecting part 1321 and the second connecting part 1322 are cross-connected, the middle positions of the two are intersected, and the two side positions along the third direction Z are spaced apart along the second direction Y.

[0151] When the number of the first tab cluster 122 increases, only the size of the first connecting part 1321 along its extension direction and / or the size of the second connecting part 1322 along its extension direction need to be increased, so that the first connecting member 132 can be adapted to a larger number of first tab clusters 122, while the impact on its weight and material consumption due to the increase in size can be reduced. Under this structure, the impact of the increase in size of the first connecting part 1321 and the second connecting part 1322 on the size of the battery monomer 10 in the second direction Y can be reduced by reducing the included angle between the first connecting part 1321 and the second connecting part 1322.

[0152] For another example, as shown in Figure 15 , when the first connecting member 132 only includes the first connecting part 1321 and the second connecting part 1322, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting member 132 can be a V-shaped structure.

[0153] For another example, as shown in Figure 16As shown, when the first connecting piece 132 only includes the first connecting portion 1321 and the second connecting portion 1322, the orthographic projection of the first connecting piece 132 can be in an O-shaped structure in the same projection plane perpendicular to the first direction X.

[0154] For another example, as shown in Figure 17 As shown, when the first connecting piece 132 only includes the first connecting portion 1321 and the second connecting portion 1322, the orthographic projection of the first connecting piece 132 can be in an O-shaped structure in the same projection plane perpendicular to the first direction X.

[0155] For another example, as shown in Figure 18 As shown, when the first connecting piece 132 only includes the first connecting portion 1321 and the second connecting portion 1322, the orthographic projection of the first connecting piece 132 can be in an O-shaped structure in the same projection plane perpendicular to the first direction X.

[0156] As shown in Figures 8 to 12 In some embodiments, the first connecting piece 132 further includes a first transition portion 1323, the first transition portion 1323 is connected with the first connecting portion 1321 and the second connecting portion 1322 respectively, the first connecting portion 1321 and the second connecting portion 1322 are arranged in the second direction Y, and the first connecting portion 1321, the second connecting portion 1322 and the first transition portion 1323 enclose at least one first notch 103 penetrating in the first direction X, and the first direction X intersects with the second direction Y.

[0157] In this way, when the number of the first tab clusters 122 increases, only the size of the first connecting portion 1321 and / or the second connecting portion 1322 in the third direction Y needs to be changed, without changing the size of the first transition portion 1323, which can reduce the impact on the cost and weight of the battery monomer 10.

[0158] Optionally, the shape of the first notch 103 can be polygonal, circular, oval or irregular, etc., and the first notch 103 can be arranged at the edge position of the first connecting piece 132, or can be arranged at the middle position of the first connecting piece 132. Optionally, the number of the first notch 103 can be one or more.

[0159] Optionally, the number of the first transition portion 1323 can be one or more. Optionally, the first transition portion 1323 can be a straight line structure, or can be a curved line structure.

[0160] Optionally, the first transition portion 1323 can be connected to the middle position of the first connecting portion 1321 and the second connecting portion 1322, or can be connected to either side of the first connecting portion 1321 and the second connecting portion 1322 in the third direction Z.

[0161] In some embodiments, the first electrode terminal 13 is electrically connected with the first adapter 1323.

[0162] The first electrode terminal 13 can be electrically connected with the first adapter 1323 by welding, soldering or other connection methods, so that the electrical energy can be transmitted between the first electrode terminal 13 and the first adapter 1323, and transmitted between the first electrode terminal 13 and the plurality of electrode assemblies 12 through the first connecting part 1321 and the second connecting part 1322, to meet the charging and discharging requirements of the battery monomer 10.

[0163] In the above manner, the connection position of the first electrode terminal 13 and the first connecting part 132 and the connection position of the first tab cluster 122 and the first connecting part 132 are staggered, which reduces the possibility of interference during assembly, facilitates the processing and manufacturing of the battery monomer 10, and effectively reduces the stress concentration of the first connecting part 132, thereby improving the reliability of the first connecting part 132 and the reliability of the battery monomer 10.

[0164] In some embodiments, the first adapter 1323 is connected between the first connecting part 1321 and the second connecting part 1322 along the second direction Y.

[0165] In this way, the processing and manufacturing of the first connecting part 132 are facilitated, and the connection strength between the first connecting part 1321, the second connecting part 1322 and the first adapter 1323 is improved, which is conducive to improving the structural strength of the first connecting part 132 and the reliability of the battery monomer 10.

[0166] The battery monomer 10 provided by the embodiments of the present application can be configured as the above structure, so as to improve the energy density of the battery monomer 10 while reducing the cost of the battery monomer 10.

[0167] In some embodiments, the first connecting part 1321 can be a plate-shaped structure extending along the third direction Z, the second connecting part 1322 can be a plate-shaped structure extending along the third direction Z, and the first adapter 1323 can be a plate-shaped structure extending along the second direction Y. The first adapter 1323 is connected between the first connecting part 1321 and the second connecting part 1322 along the second direction Y, which is conducive to simplifying the structure of the first connecting part 132, facilitating the processing and assembly of the first connecting part 132, and thereby reducing the processing and manufacturing cost of the battery monomer 10.

[0168] Optionally, the first adapter 1323 can be connected to the middle positions of the first connecting part 1321 and the second connecting part 1322 along the second direction Y, so that the three parts form two first notches 103 spaced along the second direction Y.

[0169] For example, as shown in FIG. 1, the first connecting part 1321 and the second connecting part 1322 are connected to the first electrode terminal 13 along the third direction Z, and the first adapter 1323 is connected between the first connecting part 1321 and the second connecting part 1322 along the second direction Y.Figure 8 and Figure 9 As shown in FIGS. 13 and 14, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 can have an H-shaped structure, the first connecting portion 1321 and the second connecting portion 1322 both extend along the third direction Z, and the first adapter portion 1323 extends along the second direction Y. When the number of the first tab clusters 122 increases, only the size of the first connecting portion 1321 along the third direction Z and / or the size of the second connecting portion 1322 along the third direction Z need to be increased, without changing the size of the first adapter portion 1323, so that the first connecting piece 132 can be adapted to a larger number of the first tab clusters 122, while reducing the impact on the weight and the material consumption due to the increase in size.

[0170] For another example, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 can have an A-shaped structure. In this structure, the impact on the size of the battery monomer 10 in the second direction Y due to the increase in size of the first connecting portion 1321 and the second connecting portion 1322 can be reduced by reducing the included angle between the first connecting portion 1321 and the second connecting portion 1322.

[0171] In some embodiments, the first adapter portion 1323 is connected to the same side of the first connecting portion 1321 and the second connecting portion 1322 along the third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0172] For example, as shown in FIGS. 15 and 16, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 can have a U-shaped structure. Figure 10 and Figure 11 As shown in FIGS. 15 and 16, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 can have a U-shaped structure.

[0173] The first connecting piece 132 formed by the above-mentioned connection has a first gap 103, and one side of the first connecting piece 132 along the third direction Z has an open port communicating with the first gap 103, and the other side of the first connecting piece 132 along the third direction Z is provided with the first adapter portion 1323, which facilitates the processing and manufacturing of the first connecting piece 132, reduces the processing difficulty, and thus is conducive to improving the manufacturing efficiency.

[0174] The battery monomer 10 provided by the embodiments of the present application can be provided with the above-mentioned structure of the first connecting piece 132, so as to improve the energy density of the battery monomer 10 while reducing the cost of the battery monomer 10.

[0175] In other embodiments, the first adapter portion is connected to opposite sides of the first connecting portion 1321 and the second connecting portion 1322 along the third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0176] For example, as shown in FIGS. 15 and 16, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 can have a U-shaped structure. Figure 12As shown, the orthographic projection of the first connecting member 132 can be in an N-shaped structure in the same projection plane perpendicular to the first direction X.

[0177] The battery monomer 10 provided by the embodiments of the present application can be provided with the above structure of the first connecting member 132, so as to reduce the cost of the battery monomer 10 while improving the energy density of the battery monomer 10.

[0178] Optionally, the first connecting part 1321 and the second connecting part 1322 located on the same side of the first adapter part 1323 along the third direction Z can have the same size or different size in the third direction Z.

[0179] Please refer to Figure 9 In some embodiments, the minimum size of the first connecting part 1321 in the second direction Y is L1, the minimum size of the second connecting part 1322 in the second direction Y is L2, and the minimum size of the first adapter part 1323 in the third direction Z is D, wherein 0.06≤L1 / D≤5, and / or 0.06≤L2 / D≤5, and the first direction X, the second direction Y and the third direction Z intersect with each other.

[0180] For example, the ratio of L1 / D can be, but is not limited to, 0.06, 0.1, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, etc.

[0181] If the ratio of L1 / D is set too small, i.e. less than 0.06, the connection strength of the first connecting part 1321 and the electrode assembly 12 will be affected, thereby affecting the effect of the battery monomer 10 on the transmission of electric energy. If the ratio of L1 / D is set too large, i.e. greater than 5, the connection strength of the first adapter part 1323 and the first terminal body 131 will be affected, thereby also affecting the effect of the battery monomer 10 on the transmission of electric energy. Correspondingly, if the ratio of L2 / D is set too small, i.e. less than 0.06, the connection strength of the second connecting part 1322 and the electrode assembly 12 will be affected, thereby affecting the effect of the battery monomer 10 on the transmission of electric energy. If the ratio of L2 / D is set too large, i.e. greater than 5, the connection strength of the first adapter part 1323 and the first terminal body 131 will be affected, thereby also affecting the effect of the battery monomer 10 on the transmission of electric energy.

[0182] Therefore, by setting the ratio of L1 / D and the ratio of L2 / D to be between 0.06 and 5, including the two end point values of 0.06 and 5, the connection strength of the first connecting member 132, the first terminal body 131 and the electrode assembly 12 can be improved, thereby improving the performance of the battery monomer 10.

[0183] Optionally, 0.1≤L1 / D≤3, and / or 0.1≤L2 / D≤3,

[0184] Optionally, 0.2≤L1 / D≤2, and / or, 0.2≤L2 / D≤2,

[0185] Further, in some embodiments, 0.32≤L1 / D≤1.6, and / or, 0.32≤L2 / D≤1.6.

[0186] By further setting the ratio of L1 / D and the ratio of L2 / D between 0.32 to 1.6, and including both end values of 0.32 and 1.6, the connection strength of the first connecting piece 132 and the first terminal body 131 and the electrode assembly 12 can be better improved, and the performance of the battery monomer 10 can be better improved.

[0187] In some embodiments, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 is any one of H type, X type, N type, U type, V type, and A type.

[0188] For example, as shown in FIG. 1A, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 is H type; as shown in FIG. 1B, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 is X type; as shown in FIG. 1C, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 is U type; as shown in FIG. 1D, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 is N type; as shown in FIG. 1E, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 is V type; and of course, in some other embodiments, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 can also be A type. Figures 7 to 9 Figure 13 Figure 14 Figure 10 Figure 11 Figure 12 Figure 15

[0189] In some embodiments, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 is a hollow ring structure.

[0190] The hollow ring structure can include any one of O type, B type, and D type, or the hollow ring structure can also be formed by a straight line segment.

[0191] For example, as shown in FIG. 1A, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 is O type; as shown in FIG. 1B, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 is B type; as shown in FIG. 1C, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 is D type. Figure 16 Figure 17 Figure 18 ​​​​​​​​​As shown, in the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting member 132 is D-shaped.

[0192] The battery cell 10 provided in the embodiment of the present application has a first connector 132 arranged inside thereof that can be set to any of the above shapes. This not only reduces the material used for the first connector 132 to reduce the cost and weight of the battery cell 10, but also allows the first connector 132 to have a larger deformation space in the accommodating cavity 101, so that it can better adapt to the volume change of the battery cell 10 during the charging and discharging process. In addition, it can also improve the structural strength of the first connector 132 to improve the reliability of the electrical connection, thereby extending the service life of the battery cell 10.

[0193] like Figure 7 As shown, in some embodiments, the first connecting member 132 is a plate-shaped structure.

[0194] The above-mentioned arrangement facilitates the processing and production of the first connecting member 132, which is beneficial to reducing production costs and improving processing efficiency. It is also beneficial to reducing the space occupied by the first connecting member 132 in the accommodating cavity 101 along the first direction X, so that the overall structure of the battery cell 10 is more compact and reasonable, which is beneficial to improving the space utilization of the battery cell 10. In addition, it also facilitates its connection with the first tab cluster 122 to improve the performance of the battery cell 10.

[0195] Exemplarily, two opposite side surfaces of the first connecting member 132 along the first direction X are both planes parallel to the second direction Y.

[0196] See also Figure 6 In some embodiments, the housing 11 includes an end cover 111 and a shell 112 . The shell 112 has a receiving cavity 101 and an opening 102 communicating with the receiving cavity 101 . The end cover 111 is covered on the opening 102 , and the first electrode terminal 13 is disposed on the end cover 111 .

[0197] The housing 112 may be provided with one or more openings 102. One or more end caps 111 may also be provided.

[0198] By arranging the first electrode terminal 13 on the end cover 111 , the layout is reasonable and connection and assembly are facilitated.

[0199] Please also refer to Figures 6 to 11In some embodiments, the electrode assembly 12 further comprises a plurality of second tab clusters 123 with the same polarity, the first tab cluster 122 and the second tab cluster 123 are opposite in polarity, and the plurality of second tab clusters 123 are all connected to the same side of the main body 121 along the first direction X. The battery cell 10 further comprises a second electrode terminal 14, the second electrode terminal 14 comprises a second terminal main body 141 and a second connecting piece 142, the second terminal main body 141 is arranged on the shell 11 and is electrically connected to the second connecting piece 142, and the plurality of second tab clusters 123 are all electrically connected to the second connecting piece 142.

[0200] The second electrode terminal 14 is used to be electrically connected to the electrode assembly 12 for outputting or inputting the electric energy of the battery cell 10. The electrode assembly 12 further comprises a plurality of first tab clusters 122, the first tab cluster 122 refers to a structure state formed by one second tab being bent, or a structure state formed by a plurality of second tabs being bent and stacked together, and the second tab is a part extending out of the main body 121 along the first direction X. Optionally, one of the first tab and the second tab can be a positive tab, and the other can be a negative tab, and accordingly, one of the first electrode terminal 13 and the second electrode terminal 14 is a positive electrode terminal, and the other is a negative electrode terminal.

[0201] For example, the electrode assembly 12 can have A second tabs, A is greater than or equal to 2, and the A second tabs can be divided into two second tab clusters 123, one of which has B second tabs, M < A, and the other has A-B second tabs.

[0202] By arranging the electrode assembly 12 to comprise a plurality of second tab clusters 123, all the second tabs can be arranged without overlapping, thereby reducing the height of the plurality of second tabs after being bent, i.e., reducing the overall height of the plurality of second tab clusters 123 after being bent, which is the space occupied in the first direction X, thereby reducing the occupied space in the accommodating cavity 101 of the shell 11, and further improving the energy density of the battery cell 10.

[0203] It should be noted that if the electrode assembly only comprises one second tab cluster, that is, all the second tabs are stacked together, a large number of layers will make it difficult to tightly fold, not only occupying space, but also greatly reducing the performance of the battery cell 10. Therefore, by arranging in the above manner, the assembly process difficulty of the second tabs in each second tab cluster 123 can also be reduced.

[0204] Optionally, the first tab cluster 122 and the second tab cluster 123 can be arranged on the same side of the main body 121 along the first direction X, and correspondingly, the first electrode terminal 13 and the second electrode terminal 14 are both located on the same side of the shell 11 along the first direction X, or the first tab cluster 122 and the second tab cluster 123 can be arranged on opposite sides of the main body 121 along the first direction X, and correspondingly, the first electrode terminal 13 and the second electrode terminal 14 are both located on opposite sides of the shell 11 along the first direction X.

[0205] The second electrode terminal 14 includes a second terminal body 141 and a second connecting piece 142, the second connecting piece 142 is arranged in the accommodating cavity 101 and is used for electrical connection with the second tab cluster 123, and the second terminal body 141 is arranged in the shell 11 and is used for electrical connection with the second connecting piece 142, and the side of the second terminal body 141 away from the second connecting piece 142 can be used for busbar connection.

[0206] Optionally, the shapes of the first connecting piece 132 and the second connecting piece 142 can be the same, and of course, they can also be different.

[0207] In some embodiments, the second connecting piece 142 includes a third connecting part 1421 and a fourth connecting part 1422, the third connecting part 1421 and the fourth connecting part 1422 are at least partially spaced apart, a part of the plurality of second tab clusters 123 is electrically connected with the third connecting part 1421, and another part of the plurality of second tab clusters 123 is electrically connected with the fourth connecting part 1422.

[0208] The “third connecting part 1421 and the fourth connecting part 1422 are at least partially spaced apart” means that the shape of the second connecting piece 142 is not a closed figure structure, but a structure with a gap to enable the third connecting part 1421 and the fourth connecting part 1422 to be spaced apart. The third connecting part 1421 and the fourth connecting part 1422 can be completely spaced apart, or they can also be partially spaced apart, for example, the shape of the second connecting piece 142 can be arranged as any one of an H-shaped structure, an X-shaped structure, an N-shaped structure, a U-shaped structure, a V-shaped structure, and an A-shaped structure, or the shape of the first connecting piece 132 can also be arranged as a hollow ring structure to reduce the material and weight of the second connecting piece 142. The ring structure can include any one of an O-shaped structure, a B-shaped structure, and a D-shaped structure, and can also include other ring structures composed of straight lines.

[0209] The battery monomer 10 provided by some embodiments of the present application can reduce the space occupied by the plurality of second tab clusters 123 in the first direction X after being bent, facilitate folding of each second tab cluster 123, and thus improve the energy density of the battery monomer 10. In addition, by arranging the second connecting piece 142 to include at least partially spaced third connecting portions 1421 and fourth connecting portions 1422, the second connecting piece 142 can reduce the material and weight of the second connecting piece 142 on the basis of electrical connection with the plurality of second tab clusters 123, thereby reducing the cost of the battery monomer 10.

[0210] In addition, by the above arrangement, the assembly process difficulty of the second tabs in each second tab cluster 123 can be reduced. By electrically connecting some second tab clusters 123 to the third connecting portions 1421 and electrically connecting other second tab clusters 123 to the fourth connecting portions 1422, the connection positions of the plurality of second tab clusters 123 can be staggered, which can improve the heat dissipation of the second tabs and improve the performance of the battery monomer 10.

[0211] In some embodiments, the second connecting piece 142 and the second terminal body 141 are an integral structure.

[0212] By this arrangement, the manufacturing efficiency and processing cost can be improved, the connection strength between the second connecting piece 142 and the second terminal body 141 can be improved, the structural strength of the second electrode terminal 14 can be improved, the stability of the electrical connection and the reliability of the battery monomer 10 can be improved, and the integral structure can reduce the problem of increased resistance caused by poor connection between the second connecting piece 142 and the second terminal body 141, thereby improving the conductivity and overall performance of the battery monomer 10.

[0213] In some embodiments, the number of second tab clusters 123 is less than the number of second tabs.

[0214] That is, at least one second tab cluster 123 includes a plurality of second tabs stacked, for example, the electrode assembly 12 has A second tabs, A is greater than 2, and the A second tabs can be divided into two second tab clusters 123. One second tab cluster 123 has B second tabs, B < A, and the other second tab cluster 123 has A-B second tabs. The values of B and A-B are both not equal to 1.

[0215] By the above arrangement, the number of second tab clusters 123 can be reduced, the layout can be facilitated, and the second tab clusters 123 can be connected to the second connecting piece 142.

[0216] In some embodiments, the projections of the plurality of second tab clusters 123 are staggered in the same projection plane perpendicular to the first direction X.

[0217] By the above arrangement, the overall height of the plurality of second tab clusters 123 after being bent can be reduced, which is the space occupied in the first direction X, so as to reduce the occupied space in the accommodating cavity 101 of the shell 11, and further improve the energy density of the battery monomer 10.

[0218] Optionally, the projection edges of the two adjacent second tab clusters 123 are in contact, which can maximize the use of space on the electrode assembly 12, further increase the number of second tab clusters 123, reduce the height of each second tab cluster 123, and improve the use performance of the battery monomer 10.

[0219] For example, the number of first tab clusters 122 and second tab clusters 123 can be equal, which can make the positive and negative electrodes of the battery monomer 10 more evenly distributed, and improve the performance of the battery monomer 10. Of course, the number of first tab clusters 122 and second tab clusters 123 can also be unequal, and the specific number can be adjusted according to actual needs.

[0220] For example, as shown in Figure 8 One electrode assembly 12 includes two first tab clusters 122 and two second tab clusters 123, the number of first tabs included in each of the two first tab clusters 122 is the same, and the number of second tabs included in each of the two second tab clusters 123 is the same, so that the height of the first tab and the second tab after being bent is the same, facilitating assembly, and also helping to improve the compactness of the battery monomer 10.

[0221] In some embodiments, the plurality of first tab clusters 122 and the plurality of second tab clusters 123 are connected to the same side of the main body 121 along the first direction X.

[0222] By this arrangement, the occupied space of the accommodating cavity 101 after the first tab cluster 122 and the plurality of second tab clusters 123 are bent can be better reduced, which helps to better improve the energy density of the battery monomer 10.

[0223] Optionally, in this structure, the first connecting piece 132 and the second connecting piece 142 are connected to the same side of the main body 121 along the first direction X and are spaced along the third direction Z.

[0224] Further, in some embodiments, any first tab cluster 122 and any second tab cluster 123 are spaced apart, so that the first tab cluster 122 and the second tab cluster 123 are not in contact, thereby reducing the risk of short circuit.

[0225] According to some embodiments of the present application, the present application further provides a battery device 100 comprising the battery cell 10 provided according to any of the above embodiments.

[0226] According to some embodiments of the present application, the present application further provides an energy storage device 200 comprising the battery cell 10 provided according to any of the above embodiments or the battery device 100 provided according to any of the above embodiments, the battery cell 10 or the battery device 100 is used for storing or providing electric energy.

[0227] According to some embodiments of the present application, the present application further provides an energy storage system 2000 comprising a power conversion device and the energy storage device 200 provided according to any of the above embodiments, the power conversion device is used for electrically connecting a power generation device 3000 and the energy storage device 200.

[0228] According to some embodiments of the present application, the present application further provides a charging network 1000 comprising a charging pile 300 and the energy storage device 200 provided according to any of the above embodiments or the energy storage system 2000 provided according to any of the fourth aspect embodiments, the energy storage device 200 is used for providing electric energy for the charging pile 300.

[0229] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear, the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described.

[0230] Please refer to Figures 6 to 18 According to some embodiments of the present application, the present application provides a battery cell 10 comprising a shell 11, a first electrode assembly 1201, a second electrode assembly 1202, a first electrode terminal 13 and a second electrode terminal 14, a first direction X is the height direction of the battery cell 10, a second direction Y is the width direction of the battery cell 10, and a third direction Z is the length direction of the battery cell 10.

[0231] The shell 11 includes an end cover 111 and a shell body 112 having a receiving cavity 101 and an opening 102 in communication with the receiving cavity 101, and the end cover 111 covers the opening 102. The first electrode assembly 1201 and the second electrode assembly 1202 are arranged along the second direction Y in the receiving cavity 101, and each of the first electrode assembly 1201 and the second electrode assembly 1202 includes a main body 121, a plurality of first tab clusters 122 of the same polarity, and a plurality of second tab clusters 123 of the same polarity. The first tab clusters 122 and the second tab clusters 123 are connected to the same side of the main body 121 along the first direction X. In the same projection plane perpendicular to the first direction X, the orthographic projections of the plurality of first tab clusters 122 are arranged staggered with each other, and the orthographic projections of the plurality of second tab clusters 123 are arranged staggered with each other. Any first tab cluster 122 is arranged spaced apart from any second tab cluster 123.

[0232] The first electrode terminal 13 and the second electrode terminal 14 are spaced apart along the third direction Z. The first electrode terminal 13 includes a first terminal main body 131 and a first connecting piece 132 which are an integral structure, and the second electrode terminal 14 includes a second terminal main body 141 and a second connecting piece 142 which are an integral structure. The first connecting piece 132 and the second connecting piece 142 are each in a plate shape. In the same projection plane perpendicular to the first direction X, the orthographic projection of the first connecting piece 132 is in any one of an H shape, an X shape, an N shape, a U shape, a V shape, and an A shape, or the orthographic projection of the first connecting piece 132 is in a hollow ring shape, and the orthographic projection of the second connecting piece 142 is in any one of an H shape, an X shape, an N shape, a U shape, a V shape, and an A shape, or the orthographic projection of the second connecting piece 142 is in a hollow ring shape.

[0233] The first connecting piece 132 includes a first connecting portion 1321, a second connecting portion 1322, and a first switching portion 1323. The first switching portion 1323 is connected to the first connecting portion 1321 and the second connecting portion 1322, respectively. The first connecting portion 1321, the second connecting portion 1322, and the first switching portion 1323 enclose at least one first gap 103 through which the first direction X penetrates. The first terminal main body 131 is arranged on the end cover 111 and is electrically connected to the first switching portion 1323.

[0234] The second connecting piece 142 includes a third connecting portion 1421, a fourth connecting portion 1422, and a second switching portion 1423. The second switching portion 1423 is connected to the third connecting portion 1421 and the fourth connecting portion 1422, respectively. The third connecting portion 1421, the fourth connecting portion 1422, and the second switching portion 1423 enclose at least one second gap 104 through which the first direction X penetrates. The second terminal main body 141 is arranged on the end cover 111 and is electrically connected to the second switching portion 1423.

[0235] The plurality of first tab clusters 122 in the first electrode assembly 1201 are arranged along the third direction Z and are all electrically connected with the first connecting portion 1321, and the plurality of second tab clusters 123 in the first electrode assembly 1201 are arranged along the third direction Z and are all electrically connected with the third connecting portion 1421. The plurality of first tab clusters 122 in the second electrode assembly 1202 are arranged along the third direction Z and are all electrically connected with the second connecting portion 1322, and the plurality of second tab clusters 123 in the first electrode assembly 1201 are arranged along the third direction Z and are all electrically connected with the fourth connecting portion 1422.

[0236] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0237] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that: include: a housing having a receiving cavity; an electrode assembly disposed in the accommodating cavity, the electrode assembly comprising a main body and a plurality of first tab clusters having the same polarity, wherein the plurality of first tab clusters are all connected to the same side of the main body along a first direction; a first electrode terminal comprising a first terminal body and a first connector, wherein the first terminal body is disposed in the housing and electrically connected to the first connector, the first connector comprising a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being at least partially spaced apart from each other; Part of the first tab cluster is electrically connected to the first connection portion, and another part of the first tab cluster is electrically connected to the second connection portion.

2. The battery cell according to claim 1, wherein: In the same projection plane perpendicular to the first direction, the orthographic projections of the plurality of first tab clusters are staggered with each other.

3. The battery cell according to claim 1, wherein: The electrode assemblies are provided in plurality, and the plurality of electrode assemblies are arranged along the second direction. The first connecting portion and the second connecting portion are at least partially spaced apart along the second direction, and the first direction intersects with the second direction.

4. The battery cell according to claim 3, characterized in that The plurality of first tab clusters in each of the electrode assemblies are arranged along a third direction, and the first direction, the second direction, and the third direction intersect with each other; And / or, the plurality of electrode assemblies include a first electrode assembly and a second electrode assembly, the plurality of first electrode tab clusters in the first electrode assembly are electrically connected to the first connecting portion, and the plurality of first electrode tab clusters in the second electrode assembly are electrically connected to the second connecting portion.

5. The battery cell according to claim 1, characterized in that The first connecting member also includes a first adapter portion, which is connected to the first connecting portion and the second connecting portion respectively. The first connecting portion and the second connecting portion are spaced apart along the second direction. The first connecting portion, the second connecting portion and the first adapter portion are surrounded to form at least one first notch that passes through along the first direction, and the first direction intersects with the second direction.

6. The battery cell according to claim 5, characterized in that The first electrode terminal is electrically connected to the first connecting portion.

7. The battery cell according to claim 5, characterized in that The first adapter portion is connected to the same side of the first connecting portion and the second connecting portion along the third direction; Alternatively, the first transition portion is connected to opposite sides of the first connecting portion and the second connecting portion along a third direction; and the first direction, the second direction, and the third direction intersect with each other.

8. The battery cell according to claim 7, characterized in that The minimum dimension of the first connecting portion in the second direction is L1, the minimum dimension of the second connecting portion in the second direction is L2, and the minimum dimension of the first transition portion in the third direction is D, wherein 0.06≤L1 / D≤5, and / or 0.06≤L2 / D≤5, and the first direction, the second direction and the third direction intersect each other.

9. The battery cell according to claim 8, characterized in that 0.32≤L1 / D≤1.6, and / or, 0.32≤L2 / D≤1.

6.

10. The battery cell according to claim 1, characterized in that In the same projection plane perpendicular to the first direction, the orthographic projection of the first connecting member is any one of an H-shape, an X-shape, an N-shape, a U-shape, a V-shape and an A-shape; Alternatively, in the same projection plane perpendicular to the first direction, the orthographic projection of the first connecting member is a hollow ring structure.

11. The battery cell according to claim 1, characterized in that The housing includes an end cover and a shell. The shell has the accommodating cavity and an opening communicating with the accommodating cavity. The end cover is disposed on the opening. The first electrode terminal is disposed on the end cover.

12. The battery cell according to any one of claims 1 to 11, characterized in that: The electrode assembly further includes a plurality of second tab clusters having the same polarity, wherein the first tab cluster and the second tab cluster have opposite polarity, and the plurality of second tab clusters are all connected to the same side of the main body along the first direction; The battery cell further includes a second electrode terminal including a second terminal body and a second connector. The second terminal body is disposed in the housing and electrically connected to the second connector. The plurality of second tab clusters are electrically connected to the second connector.

13. The battery cell according to claim 12, characterized in that: The second connecting member includes a third connecting portion and a fourth connecting portion, the third connecting portion and the fourth connecting portion are at least partially spaced apart, a portion of the second tab cluster is electrically connected to the third connecting portion, and another portion of the second tab cluster is electrically connected to the fourth connecting portion.

14. The battery cell according to claim 12, characterized in that In the same projection plane perpendicular to the first direction, the orthographic projections of the plurality of second tab clusters are staggered with each other.

15. The battery cell according to claim 12, characterized in that The plurality of first tab clusters and the plurality of second tab clusters are connected to the same side of the main body along the first direction.

16. A battery device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 15.

17. An energy storage device, characterized in that: The battery cell comprises a plurality of battery cells according to any one of claims 1 to 15 or a plurality of battery devices according to claim 16, wherein the battery cells or the battery devices are used to store or provide electrical energy.

18. An energy storage system, characterized in that: It comprises a power conversion device and the energy storage device as claimed in claim 17, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

19. A charging network, characterized in that: It comprises a charging pile and the energy storage device according to claim 17 or the energy storage system according to claim 18, wherein the energy storage device is used to provide electrical energy for the charging pile.

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