Battery cell, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, and the battery monomer comprises a shell, a battery module and a battery module, the electrode assembly is arranged in the accommodating cavity, the electrode assembly comprises an electrode main body and tabs, the electrode main body extends along the first direction, the number of the tabs is two, the tabs are respectively connected to two ends of the electrode main body in the first direction, and the two tabs respectively extend along the first direction away from the electrode main body; the two pole columns are arranged at the two ends of the electrode assembly in the first direction respectively, the pole columns are arranged on the sides, in the second direction, of the corresponding tabs, the pole columns penetrate through the shell and stretch into the containing cavity to be connected with the corresponding tabs, and the second direction is the thickness direction of the tabs and intersects with the first direction. According to the technical scheme, the process of bending the tabs in the assembly process of the battery monomer can be reduced, the probability of tab breakage caused by bending of the tabs is reduced, and the loss of the current capacity of the battery monomer caused by tab breakage is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] With the increasingly serious environmental problems and the gradual maturity of people's environmental awareness and the rise of oil prices, more and more people will focus on new energy vehicles when purchasing vehicles, and the advantages and disadvantages of new energy vehicles in terms of endurance and power performance play a relatively important role in people's choice. At present, most new energy vehicles use battery devices as energy storage and kinetic energy devices, and battery devices can also be found in other types of vehicles. The energy density of the battery of the battery device has a relatively important influence on the endurance and power performance of the vehicle. Therefore, improving the energy density of the battery device is the direction that needs to be studied in the process of continuous improvement and innovation of the battery device.

[0003] At present, the tab in the battery monomer of the battery device is prone to breakage, which can cause capacity loss of the battery monomer. CONTENT OF THE INVENTION

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a battery monomer, and a battery device and a power utilization device comprising the battery monomer, which can reduce the probability of tab breakage caused by bending, reduce the loss of current capacity of the battery monomer caused by tab breakage, and improve the charging and discharging efficiency of the battery monomer.

[0005] In a first aspect, an embodiment of the present application provides a battery monomer, comprising: a shell, the shell having a receiving cavity therein; an electrode assembly, the electrode assembly being arranged in the receiving cavity, the electrode assembly comprising an electrode main body and a tab, the electrode main body extending along a first direction, the number of the tabs being two and being connected to two ends of the electrode main body in the first direction respectively, the two tabs extending away from the electrode main body along the first direction respectively; two pole posts, the two pole posts being arranged at two ends of the electrode assembly in the first direction respectively and corresponding to the two tabs respectively, the pole post being arranged on one side of the corresponding tab in a second direction, the pole post penetrating through the shell and extending into the receiving cavity to be connected to the corresponding tab, the second direction being a thickness direction of the tab and intersecting the first direction.

[0006] In the technical solution, the tab extends along the extension direction of the electrode main body, and the pole is arranged on one side of the tab in the thickness direction and connected with the tab. In this way, the connection between the tab and the pole can be achieved without bending the tab, thereby reducing the process of bending the tab in the assembly process of the battery monomer, improving the assembly efficiency of the battery monomer, reducing the probability of tab rupture caused by bending, improving the reliability of the battery monomer, improving the stability of the current on the pole piece in the electrode assembly being transmitted to the pole through the tab, reducing the loss of current capacity of the battery monomer caused by tab rupture, and improving the charge-discharge efficiency of the battery monomer.

[0007] In some embodiments, the shell comprises: a first shell part and a second shell part, the number of the second shell part is two and is connected to both ends of the first shell part in the first direction, a first cavity is defined in the first shell part, a second cavity is defined in the second shell part, the first cavity and the two second cavities are communicated and jointly constitute a containing cavity, in the second direction, the height of the second shell part is less than the height of the first shell part, the electrode main body is arranged in the first cavity, at least part of the tab is arranged in the second cavity, and one end of the pole extends through the second shell part into the second cavity and is connected with the tab.

[0008] In the technical solution, the electrode main body is arranged in the first cavity defined by the first shell part, the tab is arranged in the second cavity defined by the second shell part, and the height of the second shell part is less than the height of the first shell part in the second direction. Therefore, the second shell part can provide a special containing space for the tab, reduce the mutual interference between the tab and the electrode main body, and reduce the occupied space in the second direction compared with the first shell part, thereby improving the energy density of the battery monomer.

[0009] In some embodiments, in the second direction, the pole is located between the two side surfaces of the shell in the second direction.

[0010] In the technical solution, the pole is located between the two side surfaces of the shell in the second direction. Therefore, the pole can not occupy the space beyond the two side surfaces of the shell in the second direction, thereby compacting the structure of the battery monomer and improving the energy density of the battery monomer.

[0011] In some embodiments, the projections of the two poles along the first direction are completely staggered.

[0012] In the technical solution, the projections of the two poles along the first direction are completely staggered. When a plurality of battery monomers are arranged in sequence along the first direction, the two poles arranged adjacent to each other of adjacent two battery monomers can be arranged in the second direction, thereby compacting the structure, reducing the space occupation, and improving the energy density of the battery device.

[0013] In some embodiments, the projections of the two second shell portions along the first direction are completely staggered, and in the second direction, the two pole columns are arranged on opposite sides of the two second shell portions, and the spacing between the two pole columns in the second direction is greater than or equal to 0.5 mm.

[0014] In the above technical solution, since the two second shell portions are arranged on the two sides of the first shell portion in the second direction, the two pole columns are arranged on opposite sides of the two second shell portions, and in the second direction, the spacing between the two pole columns is greater than or equal to 0.5 mm, thereby when the plurality of battery monomers are arranged and connected in sequence along the first direction, the spacing between the two pole columns can provide operating space for the electrical connection of the adjacent two pole columns of the adjacent two battery monomers, and the electrical connection efficiency between the battery monomers is improved.

[0015] In some embodiments, the ratio of the spacing between the two pole columns in the second direction to the height of the first shell portion in the second direction is less than 1 / 2.

[0016] In the above technical solution, since the spacing between the two pole columns in the second direction is less than 1 / 2 of the height of the first shell portion, the spacing between the adjacent and connected two pole columns of the adjacent two battery monomers can be less than 1 / 2 of the height of the first shell portion, thereby the size of the electrical connector connecting the two pole columns can be effectively controlled, the electrical resistance of the electrical connector is reduced, the energy loss is reduced, the charge and discharge performance of the battery device is improved, and the connection reliability between the adjacent pole columns of the adjacent battery monomers is improved.

[0017] In some embodiments, the ratio of the height of the second shell portion in the second direction to the height of the first shell portion in the second direction is less than 1 / 2.

[0018] In the above technical solution, since the ratio of the height of the second shell portion in the second direction to the height of the first shell portion in the second direction is less than 1 / 2, the occupied space of the second shell portion in the second direction can be further reduced, and the energy density of the battery monomer is improved.

[0019] In some embodiments, one side surface of the second shell portion in the second direction is flush with one side surface of the first shell portion in the second direction.

[0020] In the above technical solution, since one side surface of the second shell portion in the second direction is flush with one side surface of the first shell portion in the second direction, the structure of the shell can be simplified, and the processing efficiency of the shell is improved.

[0021] In some embodiments, the projections of the two second shell portions along the first direction are completely staggered.

[0022] In the technical solution, the projections of the two second shell portions along the first direction are completely staggered, when the plurality of battery monomers are arranged along the first direction, the two second shell portions of two adjacent battery monomers along the first direction can be arranged along the second direction to share the space between the two first shell portions of the two battery monomers, so as to reduce the space occupation and improve the energy density of the battery device.

[0023] In some embodiments, the tab includes a crimping section and a welding section, the crimping section is connected between the welding section and the electrode body, the welding section extends along a straight line in the first direction, wherein at least part of the crimping section is arranged in the first cavity, the welding section is arranged in the second cavity, and the post is connected with the welding section.

[0024] In the technical solution, the electrode body and the crimping section are arranged in the first cavity, the welding section extends along a straight line and is arranged in the second cavity, so as to reduce the height of the second cavity, the height of the second shell portion along the second direction, and the space occupation, the welding section extending along a straight line can reduce the probability of interference between the welding section and the electrode body, reduce the risk of short circuit between the tab and the electrode body, reduce the loss of energy during transmission in the tab, improve the charge and discharge efficiency of the battery monomer, reduce the stress concentration of the welding position of the welding section, improve the reliability and durability of the tab welding, and improve the yield of the tab.

[0025] In some embodiments, the welding section includes a plurality of tab pieces arranged in layers along the second direction, and the plurality of tab pieces are connected by ultrasonic roll welding to form the welding section.

[0026] In the technical solution, the plurality of tab pieces are connected by ultrasonic roll welding, which not only realizes uniform connection between the tab pieces and reduces the probability of local poor welding, but also increases the welding area of the welding section to ensure the flow capacity of the tab and improve the energy density of the battery monomer.

[0027] In some embodiments, the welding sections of the two tabs are arranged at positions close to the two side surfaces of the electrode body along the second direction.

[0028] In the technical solution, the welding sections of the two tabs are arranged at positions close to the two side surfaces of the electrode body along the second direction, so that the two second shell portions can be arranged close to the two side surfaces of the first shell portion, the structure of the shell is simplified, the projections of the two second shell portions along the first direction are staggered, the two second shell portions of two adjacent battery monomers are arranged adjacent to each other to share the space between the two first shell portions of the two adjacent battery monomers, the structure is compact, and the space occupation is reduced.

[0029] In some embodiments, the length of the welding section along the first direction is greater than or equal to 3mm.

[0030] In the technical solution, the length of the welding section in the first direction is greater than or equal to 3 mm, which can facilitate the welding of the tab and the pole, enhance the connection firmness between the tab and the pole, increase the welding length between the multiple tab pieces, improve the connection reliability between the multiple tab pieces, reduce local stress concentration, and facilitate the improvement of the welding quality during the welding of the tab piece and the welding section.

[0031] In some embodiments, the length of the welding section in the first direction is less than or equal to 6 mm.

[0032] In the technical solution, the length of the welding section in the first direction is less than or equal to 6 mm, which can reduce the length of the welding section in the first direction, thereby reducing the length of the second shell part in the first direction, reducing the occupied space of the battery monomer in the first direction, and achieving a compact structure. In addition, the material usage of the welding section can be reduced, and the cost of the battery monomer can be reduced.

[0033] In some embodiments, the shell includes a main shell and end covers, the two ends of the main shell are open in the first direction, and the number of the end covers is two and each covers the two open ends of the main shell.

[0034] In the technical solution, the shell includes a main shell and two end covers, the main shell and the end covers can be designed and processed separately, which reduces the production difficulty of the shell, improves the processing efficiency, and facilitates the assembly of the electrode assembly in the shell.

[0035] In some embodiments, the main shell includes a shell body and extension plates, the shell body extends along the first direction and has a rectangular cross section, the extension plates are two and are connected to the two ends of the shell body and extend away from the shell body in the direction, the cross section of the extension plate is a U-shaped opening towards one side in the second direction, the end cover includes first, second and third plate sections connected in sequence, the first and third plate sections extend along the second direction and are arranged at intervals in the first direction, the second plate section extends along the first direction, the first and third plate sections are arranged on the two sides of the second plate section in the second direction, and the two ends of the second plate section in the first direction are connected to the first and third plate sections, respectively. The shell body and the third plate section cooperatively enclose the first cavity, and the first, second and extension plates cooperatively enclose the second cavity.

[0036] In the technical solution, the shell body defines the first cavity open on both sides in the first direction, the extension plate is connected to the shell body and defines the second cavity in the shape of a U-shaped slot open on one side in the second direction and open on one end away from the shell body in the first direction, and the end cover is shaped to fit the open positions of the shell body and the extension plate to cover the two ends of the main shell. In this way, the assembly of the electrode assembly can be facilitated, the assembly difficulty can be reduced, and the assembly efficiency can be improved.

[0037] In some embodiments, the two extension plates and the two end covers are rotationally symmetrically arranged about a center line in a third direction of the shell body, the third direction, the second direction and the first direction being perpendicular to each other in pairs.

[0038] In the above technical solution, the two extension plates and the two end covers are rotationally symmetrically arranged about a center line in a third direction of the shell body, which can make the two second shell portions rotationally symmetric about the center line in the third direction of the shell body. Thus, when the plurality of battery monomers are arranged in the first direction, the two adjacent second shell portions of the two adjacent battery monomers in the first direction can be arranged in the second direction to share the space between the two first shell portions of the two battery monomers, thereby reducing the space occupation and improving the energy density of the battery device.

[0039] In some embodiments, the main shell and the end cover are welded.

[0040] In the above technical solution, the main shell and the end cover are welded, which can improve the connection strength between the main shell and the end cover, improve the sealing performance between the main shell and the end cover, and also improve the assembly efficiency of the battery monomer and the production efficiency.

[0041] In a second aspect, embodiments of the present application provide a battery device, comprising: a box body; a plurality of battery monomers arranged in the box body, the battery monomer being the battery monomer according to the first aspect of the present application.

[0042] In the above technical solution, since the electric device is provided with the above battery, and since the tab of the battery monomer extends in the extension direction of the electrode body, the pole is arranged on one side of the tab in the thickness direction and connected with the tab, so that the connection between the tab and the pole can be realized without bending the tab. Thus, the process of bending the tab during assembly of the battery monomer can be reduced, the assembly efficiency of the battery monomer can be improved, the probability of tab rupture caused by bending can be reduced, the reliability of the battery monomer can be improved, the stability of the current on the pole piece in the electrode assembly being transmitted to the pole through the tab can be improved, the loss of current capacity of the battery monomer caused by tab rupture can be reduced, and the charge and discharge efficiency of the battery monomer can be improved.

[0043] In some embodiments, at least part of the battery monomers are arranged in the first direction in sequence and are connected in sequence.

[0044] In the above technical solution, since at least part of the battery monomers are arranged in the first direction in sequence, the distance between the two adjacent poles of the two adjacent battery monomers can be reduced, the arrangement structure between the plurality of battery monomers can be compacted, the space occupation can be reduced, and the electrical connection between the adjacent battery monomers in the first direction can be facilitated.

[0045] In some embodiments, in the first direction, the two adjacent poles of the two adjacent battery cells are arranged opposite to each other in the second direction and have opposite polarities, and are electrically connected by the connecting piece.

[0046] In the technical solution, the two adjacent poles of the two adjacent battery cells are arranged opposite to each other in the second direction and have opposite polarities, and are electrically connected by the connecting piece, so that the probability of interference between the two adjacent poles is reduced, the two adjacent poles can share the space between the two first shell parts of the two battery cells, the structure is further compact, the space occupation is reduced, the energy density of the battery device is improved, the distance between the two connected poles is reduced, the size of the connecting piece is reduced, the resistance of the connecting piece is reduced, the energy loss is reduced, the charging and discharging performance of the battery device is improved, and the connection reliability between the adjacent poles of the adjacent battery cells is improved.

[0047] In a third aspect, the embodiments of the present application provide a power utilization device comprising the battery device according to the second aspect of the present application.

[0048] In the above embodiment, the battery device according to the second aspect is provided, and the tab of the battery cell of the battery device extends along the extension direction of the electrode body, and the pole is arranged on one side of the tab in the thickness direction and connected with the tab, so that the connection between the tab and the pole can be realized without bending the tab, thereby the process of bending the tab of the battery cell in the assembly process is reduced, the assembly efficiency of the battery cell is improved, the probability of tab rupture caused by bending is reduced, the reliability of the battery cell is improved, the stability of the current on the pole piece of the electrode assembly being transmitted to the pole through the tab is improved, the loss of the current capacity of the battery cell caused by the tab rupture is reduced, and the charging and discharging efficiency of the battery cell is improved, thereby the overall performance of the power utilization device is improved.

[0049] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 is a structural schematic diagram of a vehicle according to an embodiment of the present application;

[0051] Figure 2 is a structural schematic diagram of a battery device according to an embodiment of the present application;

[0052] Figure 3 is a structural schematic diagram of a battery cell from one angle according to an embodiment of the present application;

[0053] Figure 4 is a structural schematic diagram of a battery cell from another angle according to an embodiment of the present application;

[0054] Figure 5 is a structural schematic view of another angle of the battery cell according to an embodiment of the present application;

[0055] Figure 6 is a sectional view along line A-A in Figure 5

[0056] Figure 7 is an enlarged view of the circle indicated at B in Figure 6

[0057] Figure 8 is a schematic view of a plurality of battery cells arranged along a first direction according to an embodiment of the present application;

[0058] Figure 9 is a structural schematic view of an electrode assembly of a battery cell according to an embodiment of the present application;

[0059] Figure 10 is an exploded view of a housing of a battery cell according to an embodiment of the present application.

[0060] Reference Signs:

[0061] 1, electric device;

[0062] 1000, battery device; 2000, controller; 3000, motor;

[0063] 100, battery cell; 200, box body; 210, box main body; 220, cover plate;

[0064] 10, electrode assembly; 11, electrode main body; 12, tab; 121, folding section; 122, welding section;

[0065] 20, pole;

[0066] 30, housing; 301, accommodating cavity; 3011, first cavity; 3012, second cavity;

[0067] 311, first housing part; 312, second housing part;

[0068] 321, main housing; 3211, housing main body; 3212, extension plate;

[0069] 322, end cover; 3221, first plate section; 3222, second plate section; 3223, third plate section;

[0070] 40, first insulating member; 50, second insulating member; 60, riveting block;

[0071] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION ​​

[0072] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing 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.

[0074] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0075] In this paper, the reference to "embodiments" means that the specific features, structures or properties described in conjunction with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The skilled person in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0076] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0077] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two).

[0078] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. The orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0079] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mount", "connect", "connect", "fix", and other terms should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0080] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include one or more battery cells, and when there are multiple, the multiple battery cells are connected in series, parallel or mixed connection through busbar components.

[0081] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0082] In some embodiments, the battery apparatus can be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0083] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0084] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0085] As an example, the box body can include a first box body and a second box body. The first box body and the second box body are buckled so that the inside of the box body forms a closed space to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate.

[0086] As an example, the box body 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 the inside of the box body forms a closed space to accommodate the battery cell assembly.

[0087] As an example, the box can be part of a chassis structure of a vehicle. For example, the top cover of the box can become at least part of the floor of the vehicle, or the frame of the box can become at least part of the cross beams and longitudinal beams of the vehicle.

[0088] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, at least one side of the box being provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0089] The battery cell mentioned in the embodiments of the present application can include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., which is not limited by the embodiments of the present application. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc., which is also not limited by the embodiments of the present application. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell, and soft package battery cell, which is also not limited by the embodiments of the present application.

[0090] As an example, the battery cell can generally include a shell, an electrode assembly, and an electrolyte, the shell being used to accommodate the electrode assembly and the electrolyte, and the shell being provided with at least one positive pole and at least one negative pole. The electrode assembly includes one or more electrode assemblies, and the electrode assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet, and a separator film.

[0091] The positive electrode sheet can generally include a positive current collector and a positive active material layer, and the positive active material layer is directly or indirectly coated on the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as a positive tab sheet, and a plurality of positive tab sheets are stacked together and electrically connected to the positive pole. As an example, the plurality of positive tab sheets stacked together can be directly welded to the positive pole to form an electrical connection; or the electrode assembly can further include a positive adapter sheet, and the plurality of positive tab sheets stacked together are welded to one end of the positive adapter sheet, and the other end of the positive adapter sheet is welded to the positive pole, so that the positive tab sheet and the positive pole form an electrical connection.

[0092] The negative electrode tab generally can include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the negative electrode current collector directly or indirectly, the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer, the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab, and a plurality of negative electrode tabs are stacked together and electrically connected with the negative electrode post. For example, the plurality of negative electrode tabs stacked together can be directly welded to the negative electrode post to form an electrical connection; or the battery cell assembly can further include a negative electrode adapter sheet, the plurality of negative electrode tabs stacked together are welded to one end of the negative electrode adapter sheet, and the other end of the negative electrode adapter sheet is welded to the negative electrode post, so that the negative electrode tabs are electrically connected with the negative electrode post. The material of the separator is not limited, for example, it can be polypropylene or polyethylene, etc.

[0093] Meanwhile, the battery cell mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. For example, in a lithium ion battery, the material of the positive electrode current collector can be aluminum, the material of the positive electrode active material layer can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc., the material of the negative electrode current collector can be copper, and the material of the negative electrode active material layer can be carbon or silicon, etc. During the charging and discharging process, Li+ is inserted and de-inserted between the two electrodes: when charging, Li+ is de-inserted from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; when discharging, the opposite is true.

[0094] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells and battery devices, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc., for example, spacecraft includes airplanes, rockets, space shuttles and spaceships, etc.

[0095] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, battery devices play an irreplaceable important role as the power source of electric vehicles. Among them, battery devices as core components of new energy vehicles have high requirements in terms of energy density and reliability.

[0096] In the related art, the battery cell includes a shell and an electrode assembly arranged in the shell, wherein the electrode assembly can be formed by stacking or winding. However, whether the electrode assembly is stacked or wound, the tab needs to be bent to connect the post. However, bending the tab requires arranging a bending space for the tab in the shell, which affects the energy density of the battery cell. In addition, during the use of the battery cell, the bent position of the tab is prone to cause the tab to break, and the capacity of the tab layer corresponding to the broken tab cannot be utilized, resulting in a capacity loss of the battery cell.

[0097] Based on the above considerations, in order to reduce the probability of tab breakage and reduce the capacity loss of the battery monomer, the application designs a battery monomer, the electrode body extends along the first direction, the tab extends away from the electrode body along the first direction, and the pole is arranged on one side of the tab in the thickness direction and connected with the tab. In this way, the connection between the tab and the pole can be realized without bending the tab, thereby reducing the process of tab bending during the assembly of the battery monomer, improving the assembly efficiency of the battery monomer, reducing the probability of tab breakage caused by bending, improving the reliability of the battery monomer, and improving the stability of the current on the pole piece in the electrode assembly to the pole through the tab. Reduce the loss of current capacity of the battery monomer caused by tab breakage, and improve the charge and discharge efficiency of the battery monomer.

[0098] The application provides a power consumption device using the battery monomer of the application as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0099] The following embodiments are described in detail for the convenience of explanation, taking the power consumption device 1 as a vehicle as an example, and the structure of the power consumption device 1, the battery device 1000 and the battery monomer 100 of the application is introduced in detail.

[0100] Please refer to Figure 1 , Figure 1 The power consumption device 1 provided by some embodiments of the application is a structural schematic diagram of a vehicle. The vehicle can be a fuel car, a gas car or a new energy car. The new energy car can be a pure electric car, a hybrid car or an extended range car, etc. The vehicle is provided with a battery device 1000, which can be arranged at the bottom, head or tail of the vehicle. The battery device 1000 can be used for power supply of the vehicle, for example, the battery device 1000 can be used as the operating power supply of the vehicle. The vehicle can also include a controller 2000 and a motor 3000, the controller 2000 is used to control the battery device 1000 to supply power to the motor 3000, for example, for the working power demand of the vehicle during starting, navigation and driving. In some embodiments of the application, the battery device 1000 can not only be used as the operating power supply of the vehicle, but also be used as the driving power supply of the vehicle, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle.

[0101] Please refer to Figure 2 , Figure 2An exploded view of a battery device 1000 according to some embodiments of the present application is provided. The battery device 1000 includes a box 200 and a plurality of battery cells 100, the box 200 is configured to provide a mounting space for the battery cells 100, and the battery cells 100 are accommodated in the box 200. Any two battery cells 100 of the plurality of battery cells 100 can be connected in series or in parallel.

[0102] Reference is made below to Figures 3-10 A battery cell 100 according to some embodiments of the present application is described. Figure 3 is a structural schematic view of one angle of a battery cell 100 according to some embodiments of the present application; Figure 4 is a structural schematic view of another angle of a battery cell 100 according to some embodiments of the present application; Figure 5 is a structural schematic view of yet another angle of a battery cell 100 according to some embodiments of the present application; Figure 6 is a sectional view along line A-A in Figure 5 Figure 7 is an enlarged view of the circle indicated at B in Figure 6

[0103] Figure 8 is a schematic view of a plurality of battery cells 100 arranged along a first direction X according to some embodiments of the present application; Figure 9 is a structural schematic view of an electrode assembly 10 of a battery cell 100 according to some embodiments of the present application; Figure 10 is an exploded view of a housing 30 of a battery cell 100 according to some embodiments of the present application.

[0104] As shown in Figures 3-7 , some embodiments of the present application provide a battery cell 100, which includes a housing 30, an electrode assembly 10, and two pole posts 20. The housing 30 has an accommodation cavity 301 therein, and the electrode assembly 10 is arranged in the accommodation cavity 301. The electrode assembly 10 includes an electrode body 11 and two tabs 12. The electrode body 11 extends along a first direction X. The two tabs 12 are connected to two ends of the electrode body 11 along the first direction X, respectively. The two tabs 12 extend away from the electrode body 11 along the first direction X, respectively. The two pole posts 20 are arranged at two ends of the electrode assembly 10 along the first direction X, respectively, and correspond to the two tabs 12, respectively. The pole post 20 is arranged on one side of the corresponding tab 12 along a second direction Y. The pole post 20 extends into the accommodation cavity 301 through the housing 30 and is connected to the corresponding tab 12. The second direction Y is a thickness direction of the tab 12 and intersects the first direction X.

[0105] ​​The first direction X intersects the second direction Y, indicating that the first direction X and the second direction Y are not parallel, and the first direction X and the second direction Y are arranged at an angle. For example, the angle between the first direction X and the second direction Y can be 30°, 45°, 60°, 80°, or 90°, etc. In some specific examples, the first direction X and the second direction Y are perpendicular to each other.

[0106] In some specific examples, as shown in Figures 5-7 The first direction X can be the length direction of the battery monomer 100 and the length direction of the electrode main body 11, and the second direction Y can be the height direction of the battery monomer 100, the thickness direction of the electrode assembly 10, and the thickness direction of the tab 12.

[0107] The shell 30 of the battery monomer 100 is used to accommodate the electrode assembly 10 and the electrolyte, and is used to protect the internal structure of the battery monomer 100. In some examples, the shell 30 can be an aluminum alloy piece to reduce the weight of the battery monomer 100 and improve the energy density of the battery monomer 100. In addition, the shell 30 can also be a stainless steel piece to improve the structural strength of the shell 30.

[0108] The tab 12 of the electrode assembly 10 is connected between the electrode main body 11 and the pole 20, and is used to guide out or guide in the current generated by the electrode main body 11. Specifically, in the present embodiment, the electrode main body 11 extends along the first direction X, one end of the tab 12 is connected with the electrode main body 11, and the other end extends away from the electrode main body 11 along the first direction X, and the pole 20 is arranged on one side of the tab 12 in the thickness direction and connected with the tab 12 to realize electrical connection with the electrode main body 11.

[0109] Compared with the prior art, before the tab 12 is connected with the pole 20, the tab 12 needs to be bent, for example, the technical solution needs to be bent by 90°-180°. In the present embodiment, the tab 12 extends along the first direction X, and the tab 12 does not need to be bent. The pole 20 is arranged on one side of the tab 12 in the thickness direction and connected with the tab 12. In this way, not only can the process of bending the tab 12 in the assembly process of the battery monomer 100 be reduced, the assembly efficiency of the battery monomer 100 is improved, but also the probability of the tab 12 being broken due to bending can be reduced, the reliability of the battery monomer 100 is improved, and since the probability of the tab being broken is reduced, the stability of the current on the pole in the electrode assembly 10 being transmitted to the pole 20 through the tab 12 can be improved, the loss of the current capacity of the battery monomer 100 caused by the tab 12 being broken can be reduced, and the charge and discharge efficiency of the battery monomer 100 is improved.

[0110] In the technical solution, the tab 12 extends along the extension direction of the electrode body 11, the pole 20 is arranged on one side of the tab 12 in the thickness direction and connected with the tab 12, so that the connection between the tab 12 and the pole 20 can be realized without bending the tab 12, thereby reducing the process of bending the tab 12 in the assembling process of the battery monomer 100, improving the assembling efficiency of the battery monomer 100, reducing the probability of the tab 12 being broken due to bending, improving the reliability of the battery monomer 100, improving the stability of the current on the pole piece in the electrode assembly 10 being transmitted to the pole 20 through the tab 12, reducing the loss of the current capacity of the battery monomer 100 caused by the tab 12 being broken, and improving the charging and discharging efficiency of the battery monomer 100.

[0111] In some embodiments of the present application, as shown in Figure 5 and Figure 6 The shell 30 includes a first shell part 311 and a second shell part 312, the number of the second shell part 312 is two and is connected to both ends of the first shell part 311 in the first direction X, the first shell part 311 defines a first cavity 3011, the second shell part 312 defines a second cavity 3012, the first cavity 3011 and the two second cavities 3012 are communicated and jointly constitute a containing cavity 301, in the second direction Y, the height of the second shell part 312 is less than the height of the first shell part 311, the electrode body 11 is arranged in the first cavity 3011, at least part of the tab 12 is arranged in the second cavity 3012, and the pole 20 extends through the second shell part 312 into the second cavity 3012 and is connected with the tab 12.

[0112] That is, the containing cavity 301 defined by the shell 30 includes a first cavity 3011 and two second cavities 3012, the two second cavities 3012 are arranged on both sides of the first cavity 3011 in the first direction X, when the electrode assembly 10 is arranged in the containing cavity 301, the first cavity 3011 is used for containing the electrode body 11, and the two second cavities 3012 are respectively used for containing the two tabs 12. The tab 12 can be arranged only partially in the second cavity 3012, and the tab 12 can also be entirely contained in the second cavity 3012.

[0113] Since the thickness of the tab 12 is significantly less than the thickness of the electrode body 11 in the thickness direction of the electrode assembly 10, by arranging the second shell part 312 defining the second cavity 3012, a special containing space can be provided for the tab 12, and the mutual interference between the tab 12 and the electrode body 11 is reduced. And since the height dimension of the second shell part 312 in the second direction Y is smaller than that of the first shell part 311, compared with the first shell part 311, the second shell part 312 can reduce the occupied space in the second direction Y, and improve the energy density of the battery monomer 100.

[0114] In some specific examples, as shown in Figure 5 and Figure 6 The first shell part 311 is a cuboid-shaped box, and the second shell part 312 can also be a cuboid-shaped box. Further, in the third direction Z, the two end faces of the first shell part 311 are flush with the two end faces of the second shell part 312, and the third direction Z intersects the first direction X and the second direction Y. In this way, on the one hand, the structure of the shell 30 can be simple, facilitating processing and manufacturing, and on the other hand, the size of the second shell part 312 in the third direction Z can be increased, and thus the size of the tab 12 in the third direction Z can be increased, thereby improving the flow capacity of the tab 12.

[0115] In some specific examples, referring to Figure 6 and Figure 7 The second shell part 312 is provided with a mounting hole penetrating the second shell part 312 in the second direction Y, and the pole 20 extends in the second direction Y and is arranged in the mounting hole. Specifically, one end of the pole 20 is located outside the second shell part 312 for connecting an external electrical connector, and the other end of the pole 20 extends into the second cavity 3012 through the mounting hole and is electrically connected to the tab 12. Since the pole 20 is arranged on one side of the second shell part 312 in the second direction Y, compared with arranging the pole 20 on the side of the second shell part 312 in the first direction X away from the electrode body 11, the present embodiment can reduce the space occupation of the battery monomer 100 in the first direction X and improve the energy density of the battery monomer 100.

[0116] Further, referring to Figure 6 and Figure 7 The battery monomer 100 further comprises a first insulating member 40, which is arranged in the second cavity 3012. The first insulating member 40 is provided with a first through hole penetrating the first insulating member 40 in the second direction Y. The first insulating member 40 is sleeved on the other end of the pole 20 through the first through hole, and the first insulating member 40 is used to isolate the pole 20 from the inner wall surface of the second shell part 312 and to isolate the pole 20 from the peripheral wall of the first through hole.

[0117] Further, referring to Figure 6 and Figure 7The battery monomer 100 further comprises a second insulating piece 50, an outer side surface of the second shell part 312 is formed with a recessed accommodating groove, the second insulating piece 50 is arranged on the outer side of the second shell part 312 and located in the mounting groove, the second insulating piece 50 is formed with a recessed fixing groove on a side thereof away from the first insulating piece 40 in the second direction Y, and the second insulating piece 50 is formed with a second through hole penetrating through a bottom wall of the fixing groove in the second direction Y. The battery monomer 100 further comprises a riveting block 60 fixed in the fixing groove, the riveting block 60 is formed with a third through hole penetrating through the riveting block 60 in the second direction Y, the third through hole is opposite to the second through hole in the second direction Y, and the pole column 20 sequentially penetrates through the third through hole, the second through hole and the first through hole. The second insulating piece 50 is arranged between the pole column 20 and the second shell part 312, and is used for realizing electrical insulation between the second shell part 312 and the pole column 20 on the outer side of the second shell part 312.

[0118] In the above technical solution, the electrode body 11 is arranged in the first cavity 3011 defined by the first shell part 311, the tab 12 is arranged in the second cavity 3012 defined by the second shell part 312, and the height of the second shell part 312 in the second direction Y is less than the height of the first shell part 311. Therefore, the second shell part 312 can provide a special accommodating space for the tab 12, reduce the mutual interference between the tab 12 and the electrode body 11, and the second shell part 312 can reduce the occupied space in the second direction Y compared with the first shell part 311, thereby improving the energy density of the battery monomer 100.

[0119] In some embodiments of the present application, as shown in Figures 6-8 In the second direction Y, the pole column 20 is located between the two side surfaces of the shell 30 in the second direction Y.

[0120] In other words, one end of the pole column 20 extends into the second shell part 312, the other end of the pole column 20 extends away from the second shell part 312 in the second direction Y, and the other end of the pole column 20 does not exceed the one side surface of the shell 30 downstream of the extension direction of the other end of the pole column 20 in the second direction Y. In this way, the maximum height of the battery monomer 100 in the second direction Y is the maximum height of the shell 30 in the second direction Y, and the pole column 20 does not need to occupy the space outside the two side surfaces of the shell 30 in the second direction Y, thereby compacting the structure of the battery monomer 100 and improving the energy density of the battery monomer 100.

[0121] Further, as shown in Figure 6 and Figure 7As shown, in the first direction X, the pole column 20 is completely located on the side of the second shell part 312 facing the side surface of the first shell part 311. In other words, the projection of the pole column 20 in the second direction Y is completely located within the projection of the second shell part 312. In this way, in the first direction X, the pole column 20 can not occupy space beyond the second shell part 312, thereby compacting the structure of the battery monomer 100 and improving the energy density of the battery monomer 100.

[0122] In the above technical solution, since the pole column 20 is located between the two side surfaces of the shell 30 in the second direction Y, the pole column 20 can not occupy space beyond the two side surfaces of the shell 30 in the second direction Y, thereby compacting the structure of the battery monomer 100 and improving the energy density of the battery monomer 100.

[0123] In some embodiments of the present application, as shown in Figures 6-8 The projections of the two pole columns 20 in the first direction X are completely staggered.

[0124] In other words, the two pole columns 20 respectively face different regions of the shell 30 in the second direction Y. In this way, when a plurality of battery monomers 100 are arranged in the first direction X, the projections of the two adjacent pole columns 20 of two adjacent battery monomers 100 in the first direction X can be arranged in the second direction Y. Thus, the probability of interference between the two adjacent pole columns 20 of the adjacent battery monomers 100 can be reduced, and the two adjacent pole columns 20 of the two adjacent battery monomers 100 in the first direction X can be arranged in the second direction Y, which can share the space between the two first shell parts 311 of the two battery monomers 100, thereby further compacting the structure, reducing space occupation, and improving the energy density of the battery device 1000.

[0125] In the above technical solution, since the projections of the two pole columns 20 in the first direction X are completely staggered, when a plurality of battery monomers 100 are arranged in the first direction X, the two adjacent pole columns 20 of the two adjacent battery monomers 100 can be arranged in the second direction Y, thereby compacting the structure, reducing space occupation, and improving the energy density of the battery device 1000.

[0126] In some embodiments of the present application, as shown in Figures 6-8 The projections of the two second shell parts 312 in the first direction X are completely staggered, and in the second direction Y, the two pole columns 20 are arranged on the opposite sides of the two second shell parts 312, and the distance between the two pole columns 20 in the second direction Y is greater than or equal to 0.5 mm.

[0127] In other words, in the projection plane perpendicular to the first direction X, the projections of the two second shell portions 312 are completely staggered in the second direction Y. At this time, the two second shell portions 312 are respectively opposite and connected to different regions of the first shell portion 311 in the second direction Y.

[0128] In this way, when the plurality of battery monomers 100 are arranged along the first direction X, the two adjacent second shell portions 312 of the two adjacent battery monomers 100 can be staggered in the projection along the first direction X, so that the two adjacent second shell portions 312 of the two adjacent battery monomers 100 in the first direction X can be arranged in the second direction Y and share the space between the two first shell portions 311 of the two battery monomers 100, reducing the probability of interference between the two adjacent second shell portions 312 of the adjacent battery monomers 100, further compact structure, reduce space occupation, and improve the energy density of the battery device 1000.

[0129] Further, the first shell portion 311 has a first side and a second side arranged opposite in the second direction Y, one of the second shell portions 312 is arranged close to the first side, and the pole 20 arranged on the second shell portion 312 close to the first side is arranged on the side of the second shell portion 312 facing the second side, and the other second shell portion 312 is arranged close to the second side, and the pole 20 arranged on the second shell portion 312 close to the second side is arranged on the side of the second shell portion 312 facing the first side.

[0130] Further, the projections of the two poles 20 in the projection plane perpendicular to the first direction X are staggered in the second direction Y, and the distance between the two poles 20 in the second direction Y is greater than or equal to 0.5mm, for example, the distance between the two poles 20 in the second direction Y can be 0.6mm, 0.8mm, 1mm, 1.5mm, 2mm, 3mm, 5mm, 8mm, 10mm or 15mm and above, etc.

[0131] In this way, when the plurality of battery monomers 100 are arranged and connected in sequence along the first direction X, the distance between the two adjacent poles 20 of the two adjacent battery monomers 100 in the second direction Y is equal to the distance between the two poles 20 of the same battery monomer 100 in the second direction Y.

[0132] It should be noted that when the height between the two pole columns 20 is too small, for example, the spacing of the two pole columns 20 in the second direction Y is less than 0.3 mm, the spacing between the adjacent two pole columns 20 of the adjacent two battery monomers 100 is also less than 0.3 mm, at this time, when welding the pole column 20 and connecting the connecting piece between the two pole columns 20, the welding equipment is difficult to extend into the space between the two pole columns 20, and the welding cannot be completed, or the welding quality is seriously affected, and the connection reliability and stability between the pole columns 20 are affected.

[0133] In the embodiment, the spacing between the two pole columns 20 is greater than or equal to 0.5 mm, which can provide an operation space for the electrical connection of the adjacent two pole columns 20 of the adjacent two battery monomers 100, facilitate the electrical connection of the adjacent two battery monomers 100 in the first direction X, and improve the assembly efficiency.

[0134] In the above technical solution, since the two second shell parts 312 are arranged on the two sides of the first shell part 311 in the second direction Y, the two pole columns 20 are arranged on the opposite sides of the two second shell parts 312, and in the second direction Y, the spacing between the two pole columns 20 is greater than or equal to 0.5 mm, so that when the plurality of battery monomers 100 are arranged and connected in sequence along the first direction X, the spacing between the two pole columns 20 can provide an operation space for the electrical connection of the adjacent two pole columns 20 of the adjacent two battery monomers 100, and improve the electrical connection efficiency between the battery monomers 100.

[0135] In some embodiments of the present application, as shown in Figures 6-8 The ratio of the spacing of the two pole columns 20 in the second direction Y to the height of the first shell part 311 in the second direction Y is less than 1 / 2.

[0136] That is, in the second direction Y, the spacing between the two pole columns 20 is less than 1 / 2 of the height of the first shell part 311. For example, the ratio of the spacing between the two pole columns 20 to the height of the first shell part 311 can be 0.45, 0.4, 0.35, 0.3, 0.25, 0.2, 0.15 or 0.1, etc.

[0137] It should be noted that when the spacing of the two pole columns 20 in the second direction Y is too large, for example, the spacing between the two pole columns 20 is greater than or equal to 1 / 2 of the height of the second shell part 312, the spacing between the adjacent two pole columns 20 of the adjacent two battery monomers 100 will be too large, which will result in that the size of the electrical connecting piece is too large, thereby increasing the resistance of the electrical connecting piece, increasing the energy loss, reducing the charge and discharge efficiency of the battery device 1000, and also reducing the connection reliability between the two pole columns 20.

[0138] In the technical solution, the interval between the two adjacent and connected pole columns 20 of the two adjacent battery monomers 100 is less than 1 / 2 of the height of the first shell part 311, so that the size of the electrical connector between the two pole columns 20 can be effectively controlled, the electrical resistance of the electrical connector is reduced, the energy loss is reduced, the charging and discharging performance of the battery device 1000 is improved, and the connection reliability between the adjacent pole columns 20 of the adjacent battery monomers 100 is improved.

[0139] In some embodiments of the present application, as shown in Figures 6-8 The ratio of the height of the second shell part 312 in the second direction Y to the height of the first shell part 311 in the second direction Y is less than 1 / 2.

[0140] That is, in the second direction Y, the height of the second shell part 312 is less than 1 / 2 of the height of the first shell part 311, so that the occupied space of the second shell part 312 in the second direction Y can be further reduced, and the energy density of the battery monomer 100 is improved. For example, the ratio of the height of the second shell part 312 in the second direction Y to the height of the first shell part 311 in the second direction Y can be 0.45, 0.4, 0.35, 0.3, 0.25, 0.2, 0.15 or 0.1, etc.

[0141] The height of the second shell part 312 in the second direction Y represents the interval between the end faces or end edges of the two ends of the second shell part 312 in the second direction Y. The height of the first shell part 311 in the second direction Y represents the interval between the end faces or end edges of the two ends of the first shell part 311 in the second direction Y.

[0142] In the technical solution, the ratio of the height of the second shell part 312 in the second direction Y to the height of the first shell part 311 in the second direction Y is less than 1 / 2, which can further reduce the occupied space of the second shell part 312 in the second direction Y and improve the energy density of the battery monomer 100.

[0143] In some embodiments of the present application, as shown in Figures 6-8 One side surface of the second shell part 312 in the second direction Y is flush with one side surface of the first shell part 311 in the second direction Y.

[0144] In some specific examples, the first direction X is a left-right direction, the second direction Y is a front-rear direction, the two second shell portions 312 are respectively connected to the left and right ends of the first shell portion 311, and the two second shell portions 312 are respectively arranged close to the front and rear side surfaces of the first shell portion 311. Further, the front side surface of the second shell portion 312 on the left side of the first shell portion 311 is flush and coplanar with the front side surface of the first shell portion 311, and the rear side surface of the second shell portion 312 on the right side of the first shell portion 311 is flush and coplanar with the rear side surface of the first shell portion 311. In this way, the structure of the shell 30 can be simplified, and the shell 30 can be conveniently processed and formed.

[0145] In the above technical solution, since one side surface of the second shell portion 312 in the second direction Y is flush with one side surface of the first shell portion 311 in the second direction Y, the structure of the shell 30 can be simplified, and the processing efficiency of the shell 30 can be improved.

[0146] In some embodiments of the present application, as shown in Figures 6-8 , the projections of the two second shell portions 312 along the first direction X are completely staggered.

[0147] In other words, in the projection plane perpendicular to the first direction X, the projections of the two second shell portions 312 are spaced apart in the second direction Y. At this time, the two second shell portions 312 respectively face and connect to different regions of the first shell portion 311 in the second direction Y.

[0148] In this way, when the plurality of battery monomers 100 are arranged along the first direction X, the projections of the adjacent two second shell portions 312 of the adjacent two battery monomers 100 along the first direction X can be staggered, so that the adjacent two second shell portions 312 of the adjacent two battery monomers 100 in the first direction X can be arranged in the second direction Y to share the space between the two first shell portions 311 of the two battery monomers 100, reduce the probability of interference between the adjacent two second shell portions 312 of the adjacent battery monomers 100, further compact the structure, reduce the space occupation, and improve the energy density of the battery device 1000.

[0149] In the above technical solution, since the projections of the two second shell portions 312 along the first direction X are completely staggered, when the plurality of battery monomers 100 are arranged along the first direction X, the projections of the adjacent two second shell portions 312 of the adjacent two battery monomers 100 along the first direction X can be staggered, so that the adjacent two second shell portions 312 of the adjacent two battery monomers 100 in the first direction X can be arranged in the second direction Y to share the space between the two first shell portions 311 of the two battery monomers 100, reduce the space occupation, and improve the energy density of the battery device 1000.

[0150] In some embodiments of the present application, as shown in Figure 6 , Figure 7 and Figure 9As shown, the tab 12 includes a crimped section 121 and a welded section 122, the crimped section 121 is connected between the welded section 122 and the electrode body 11, the welded section 122 extends in a straight line in the first direction X, wherein at least part of the crimped section 121 is arranged in the first cavity 3011, the welded section 122 is arranged in the second cavity 3012, and the post 20 is connected to the welded section 122.

[0151] The crimped section 121 of the tab 12 is formed by the part of the tab sheet that is crimped, and the welded section 122 of the tab 12 is formed by the part of the tab sheet that is laminated and then formed after welding. The crimped section 121 can be arranged partly in the first cavity 3011 and partly in the second cavity 3012, or the crimped section 121 can be entirely accommodated in the first cavity 3011, and the welded section 122 is accommodated in the second cavity 3012.

[0152] It should be noted that, in the first direction X and from the electrode body 11 to the welded section 122, the tab 12 is gradually crimped, so the height dimension of the crimped section 121 in the second direction Y gradually decreases. Therefore, in the second direction Y, the thickness of the welded section 122 is significantly reduced compared to the thickness of the electrode body 11 and the crimped section 121 connected to the electrode body 11.

[0153] By accommodating the electrode body 11 and the crimped section 121 in the first cavity 3011 and the welded section 122 in the second cavity 3012, the thickness of the welded section 122 can be reduced, the height of the second cavity 3012 can be reduced, the height dimension of the second shell portion 312 in the second direction Y can be reduced, and the space occupation can be reduced. The second cavity 3012 with a smaller height dimension can also limit the welded section 122, avoid interference between the welded section 122 and the electrode body 11, reduce the risk of short circuit between the tab 12 and the electrode body 11, and improve the reliability of the battery monomer 100.

[0154] In addition, since the post 20 is connected to the welded section 122 in the second cavity 3012, the post 20 can be arranged on the second shell portion 312, and further, the post 20 is arranged on one side of the second shell portion 312 in the second direction Y, so that the post 20 does not need to occupy space beyond the shell 30 in the first direction X, and the structure of the battery monomer 100 is compact.

[0155] In addition, the welded section 122 extends in a straight line in the first direction X, that is, the welded section 122 does not need to be bent and is directly connected to the post 20, so that the straight-line extending welded section 122 can reduce the complexity of the current transmission path in the tab 12, reduce the resistance loss, reduce the energy loss in the transmission process in the tab 12, and improve the charging and discharging efficiency of the battery monomer 100.

[0156] Since the tab 12 tends to generate stress concentration at the bending position, the strength of the welding section 122 is reduced, and the welding section 122 is prone to cracking and other problems during long-term use. The welding section 122 of the embodiment extends in a straight line, which not only reduces the stress concentration of the welding position of the welding section 122, improves the reliability and durability of the tab 12 welding, but also improves the yield of the tab 12, simplifies the positioning and assembly of the tab 12, and improves the assembly accuracy and assembly efficiency.

[0157] In the above technical solution, since the electrode body 11 and the folding section 121 are arranged in the first cavity 3011, the welding section 122 extends in a straight line and is arranged in the second cavity 3012, which can reduce the height of the second cavity 3012, reduce the height dimension of the second shell part 312 in the second direction Y, reduce the space occupation, the straightly extending welding section 122 can reduce the probability of interference between the welding section 122 and the electrode body 11, reduce the risk of short circuit between the tab 12 and the electrode body 11, also can reduce the loss of energy in the transmission process in the tab 12, improve the charging and discharging efficiency of the battery monomer 100, reduce the stress concentration of the welding position of the welding section 122, improve the reliability and durability of the tab 12 welding, improve the yield of the tab 12.

[0158] In some embodiments of the present application, referring to Figure 9 The welding section 122 includes a plurality of tab pieces arranged in layers along the second direction Y, and the plurality of tab pieces are connected by ultrasonic roll welding to form the welding section 122.

[0159] Ultrasonic roll welding refers to that a metal roller-shaped welding head is in contact with the surface of the workpiece to be welded under the action of pressure and rolls at a certain speed. The welding head generates ultrasonic energy through high-frequency vibration. Under the action of ultrasonic waves, the molecules between the welding interface generate intense friction, so that the contact surface is rapidly heated and reaches a plastic state, thereby realizing the firm connection of multiple workpieces.

[0160] Among them, ultrasonic roll welding can be applied to the connection of tab pieces of different thicknesses and materials. Whether it is a thin tab piece or a thicker tab piece, good welding effect can be achieved by adjusting the welding parameters. For tab pieces of different materials such as copper and aluminum, ultrasonic roll welding can also provide reliable connection and has strong versatility.

[0161] In the embodiment, ultrasonic roll welding is used between the plurality of tab pieces, which not only can uniformly distribute the welding energy in the entire welding area, ensure the consistent connection strength between each tab piece, realize uniform connection between the tab pieces, and reduce the probability of local poor welding, but also can increase the welding area of the welding section 122, ensure the flow capacity of the tab 12, and improve the energy density of the battery monomer 100.

[0162] In the technical solution, the plurality of tab pieces are connected by ultrasonic roll welding, which can not only realize uniform connection between the tab pieces and reduce the probability of local poor welding, but also increase the welding area of the welding section 122, ensure the flow capacity of the tab 12, and improve the energy density of the battery monomer 100.

[0163] In some embodiments of the present application, with reference to Figure 9 The welding sections 122 of the two tabs 12 are respectively folded near the two side surfaces of the electrode body 11 in the second direction Y.

[0164] Specifically, the two tabs 12 are respectively connected to the two ends of the electrode body 11 in the first direction X and extend along a straight line away from the electrode body 11 in the first direction X. The electrode body 11 has a first body surface and a second body surface arranged opposite in the second direction Y. One of the two tabs 12 is folded near one side of the electrode body 11 close to the first body surface, and the other tab 12 is folded near one side of the electrode body 11 close to the second body surface.

[0165] Further, in the second direction Y, the two tabs 12 are both located between the two surfaces of the electrode body 11 arranged opposite in the second direction Y. Still further, in the second direction Y, the side surfaces opposite to each other of the two tabs 12 are flush with the two side surfaces of the electrode body 11.

[0166] Since the second cavity 3012 of the second shell part 312 is used to accommodate the welding section 122 of the tab 12, when the welding section 122 is arranged at the position of the electrode body 11 close to the two side surfaces in the second direction Y, the second shell part 312 also needs to be arranged close to the two side surfaces of the first shell part 311 in the second direction Y. On the one hand, this is conducive to simplifying the structure of the shell 30 by making the first shell part 311 flush with the second shell part 312, and on the other hand, it is conducive to staggering the projections of the two second shell parts 312 in the projection plane perpendicular to the first direction X. Thus, when a plurality of battery monomers 100 are arranged in the first direction X, the projections of the two second shell parts 312 of adjacent two battery monomers 100 in the first direction X can be staggered, so that the two second shell parts 312 of the adjacent two battery monomers 100 in the first direction X can be arranged apart in the second direction Y to share the space between the two first shell parts 311 of the two battery monomers 100, reduce the probability of interference between the two second shell parts 312 between adjacent battery monomers 100, further compact the structure, reduce the space occupation, and improve the energy density of the battery device 1000.

[0167] In the technical solution, the welding sections 122 of the two tabs 12 are arranged at positions close to the two side surfaces of the electrode body 11 in the second direction Y, so that the two second shell portions 312 can be arranged at positions close to the two side surfaces of the first shell portion 311, the structure of the shell 30 is simplified, and the projections of the two second shell portions 312 in the first direction X are staggered, so that the two second shell portions 312 of the two adjacent battery monomers 100 share the space between the two first shell portions 311 of the two adjacent battery monomers 100, the structure is compact, and the space occupation is reduced.

[0168] In some embodiments of the present application, referring to Figure 9 In the first direction X, the length of the welding section 122 is greater than or equal to 3 mm.

[0169] For example, the length of the welding section 122 in the first direction X can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 12 mm, or 15 mm or more.

[0170] In the present embodiment, by making the length of the welding section 122 in the first direction X greater than or equal to 3 mm, the surface area of the welding section 122 in the second direction Y can be increased, and the contact area between the tab 12 and the pole 20 can be increased, so that the tab 12 and the pole 20 can be more conveniently welded, the connection between the tab 12 and the pole 20 can be more firmly connected, the impact resistance of the connection position of the tab 12 and the pole 20 can be improved, the welding length between multiple tab pieces can be increased, the connection reliability between multiple tab pieces can be improved, welding stress can be dispersed, the probability of local stress concentration can be reduced, and the overall reliability of the battery device 1000 is improved.

[0171] At the same time, the length of the welding section 122 in the first direction X is greater than or equal to 3 mm, which can provide more operating space for the operator when welding the tab piece and welding the pole 20 and the welding section 122, thereby facilitating improvement of the welding quality.

[0172] In the technical solution, the length of the welding section 122 in the first direction X is greater than or equal to 3 mm, which can more conveniently weld the tab 12 and the pole 20, can more firmly connect the connection between the tab 12 and the pole 20, can increase the welding length between multiple tab pieces, can improve the connection reliability between multiple tab pieces, can reduce local stress concentration, and can also facilitate improvement of the welding quality when welding the tab piece and welding the pole 20 and the welding section 122.

[0173] In some embodiments of the present application, referring to Figure 9 In the second direction Y, the length of the welding section 122 is less than or equal to 6 mm.

[0174] That is, the length of the welding section 122 in the second direction Y is greater than or equal to 3 mm and less than or equal to 6 mm. For example, the length of the welding section 122 in the second direction Y can be 3.2 mm, 3.5 mm, 3.6 mm, 3.9 mm, 4.2 mm, 4.5 mm, 4.8 mm, 5.1 mm, 5.4 mm, 5.7 mm, or 5.9 mm, and the like.

[0175] In the above technical solution, the length of the welding section 122 in the first direction X is less than or equal to 6 mm, which can reduce the length of the welding section 122 in the first direction X, thereby reducing the length of the second shell portion 312 in the first direction X, so as to reduce the occupied space of the battery monomer 100 in the first direction X, compact structure, and also reduce the material amount of the welding section 122, thereby reducing the cost of the battery monomer 100.

[0176] In some embodiments of the present application, as shown in Figure 10 The shell 30 includes a main shell 321 and end covers 322, both ends of the main shell 321 are open in the first direction X, and the number of the end covers 322 is two and each covers an open end of the main shell 321.

[0177] In the present embodiment, since the main shell 321 and the end covers 322 are designed separately, the main shell 321 and the end covers 322 can be designed and processed respectively, which reduces the production difficulty of the shell 30 and improves the processing efficiency. When assembling the battery monomer 100, the electrode assembly 10 and other components can be placed into the main shell 321 through the open end of the main shell 321, and then the end covers 322 are covered on both ends of the main shell 321, thereby facilitating the assembly of the electrode assembly 10.

[0178] In some examples, the main shell 321 and the end covers 322 are sealingly connected, for example, the main shell 321 and the end covers 322 can be sealingly connected by a sealing member. For example, the main shell 321 and the end covers 322 can also be welded to improve the connection reliability and sealing performance between the main shell 321 and the end covers 322.

[0179] In some examples, any one of the main shell 321 and the end covers 322 can be an aluminum alloy piece, or can be a stainless steel piece, further, the main shell 321 and the end covers 322 can be made of the same material.

[0180] In some examples, the thickness of the main shell 321 and the thickness of the end covers 322 can be the same or different, for example, to improve the structural strength of the shell 30 at the end position, the thickness of the plate material of the end covers 322 can be greater than the thickness of the plate material of the main shell 321.

[0181] In the technical solution, the shell 30 comprises a main shell 321 and two end covers 322, the main shell 321 and the end covers 322 can be designed separately and machined separately, so as to reduce the production difficulty of the shell 30, improve the machining efficiency, and facilitate the assembly of the electrode assembly 10 in the shell 30.

[0182] In some embodiments of the present application, as shown in Figure 10 The main shell 321 comprises a shell body 3211 and two extension plates 3212, the shell body 3211 extends along the first direction X and has a rectangular cross section, the extension plates 3212 are connected to two ends of the shell body 3211 respectively and extend away from the shell body 3211, the cross section of the extension plate 3212 is U-shaped and open to one side in the second direction Y, the end cover 322 comprises a first plate segment 3221, a second plate segment 3222 and a third plate segment 3223 connected in sequence, the first plate segment 3221 and the third plate segment 3223 extend along the second direction Y and are arranged at intervals in the first direction X, the second plate segment 3222 extends along the first direction X, the first plate segment 3221 and the third plate segment 3223 are arranged on two sides of the second plate segment 3222 in the second direction Y respectively, and two ends of the second plate segment 3222 in the first direction X are connected to the first plate segment 3221 and the third plate segment 3223 respectively, wherein the shell body 3211 and the third plate segment 3223 cooperatively enclose the first cavity 3011, and the first plate segment 3221, the second plate segment 3222 and the extension plate 3212 cooperatively enclose the second cavity 3012.

[0183] Specifically, the shell body 3211 is a cuboid box shape with two open ends in the first direction X, the length direction of the shell body 3211 is along the first direction X, the height direction is along the second direction Y, and the width direction is along the third direction Z. The shell body 3211 comprises two first side plates arranged oppositely in the second direction Y and two second side plates arranged oppositely in the third direction Z, and two ends of the first side plate in the third direction Z are connected to two ends of the second side plate perpendicularly.

[0184] The extension plate 3212 is connected to two ends of the shell body 3211 in the first direction X and extends away from the shell body 3211 in the first direction X, specifically, the extension plate 3212 comprises a first flat plate, the first flat plate is connected to one end of one of the first side plates of the shell body 3211 in the first direction X, and two ends of the first flat plate in the third direction Z are flush with two ends of the first side plate in the third direction Z. Further, the extension plate 3212 further comprises two first folded edges, the two first folded edges are connected to two ends of the first flat plate in the third direction Z respectively and are bent perpendicularly to the first flat plate along the second direction Y, two end edges of the first folded edge in the first direction X are flush with two end edges of the first flat plate in the first direction X, and one end of the first folded edge in the first direction X connected to the second side plate.

[0185] The shell body 3211 is integrally formed with the extension plate 3212, the two side surfaces of the first plate in the second direction Y and the two side surfaces of the first side plate connected with the first plate in the second direction Y are coplanar respectively, and the two side surfaces of the first folded edge in the third direction Z and the two side surfaces of the second side plate connected with the first folded edge in the third direction Z are coplanar respectively.

[0186] The shape of the end cover 322 is adapted to the shape of the two open ends of the main shell 321 defined by the shell body 3211 and the extension plate 3212 in cooperation, specifically, the first plate segment 3221 of the end cover 322 is arranged perpendicular to the first direction X and covers the end opening of the extension plate 3212 at the end of the shell body 3211 away from the shell body 3211 in the first direction X, the second plate segment 3222 is arranged perpendicular to the second direction Y and covers the U-shaped groove opening of the extension plate 3212 in the second direction Y, and the third plate segment 3223 is arranged perpendicular to the first direction X and covers the open end of the part of the shell body 3211 arranged staggered with the extension plate 3212 in the first direction X.

[0187] When the battery cell 100 is assembled, the electrode assembly 10 can be loaded into the main shell 321, the electrode body 11 is located in the shell body 3211, and the welding segment 122 of the tab 12 is accommodated in the U-shaped space defined by the extension plate 3212, and then the two end covers 322 are covered at the two ends of the main shell 321 respectively, and the assembly process is simple and convenient.

[0188] In some examples, the second plate segment 3222 of the end cover 322 is formed with a mounting hole penetrating through the second plate end along the second direction Y, and the pole 20 is arranged in the mounting hole, wherein the mounting hole is located at the middle position of the second plate end in the first direction X and the third direction Z.

[0189] In some examples, the end cover 322 can be integrally bent from a sheet metal part, thereby processing is simple and convenient, and processing cost is reduced.

[0190] In the above technical solution, the shell body 3211 defines a first cavity 3011 open at both sides in the first direction X, the extension plate 3212 is connected with the shell body 3211 and defines a second cavity 3012 in the shape of a U-shaped groove open at one side in the second direction Y and open at one end away from the shell body 3211 in the first direction X, and the end cover 322 is adapted to the shape of the opening position of the shell body 3211 and the extension plate 3212 to cover the two ends of the main shell 321, thereby the electrode assembly 10 can be conveniently assembled, the assembly difficulty is reduced, and the assembly efficiency is improved.

[0191] In some embodiments of the present application, as Figure 10As shown, the two extension plates 3212 and the two end covers 322 are both rotationally symmetric about the center line in the third direction Z of the shell body 3211, and the third direction Z, the second direction Y and the first direction X are perpendicular to each other.

[0192] By rotationally symmetrically arranging the two extension plates 3212 and the two end covers 322 about the center line in the third direction Z of the shell body 3211, when the shell 30 is assembled, the two second cavities 3012 can be rotationally symmetric about the center line in the third direction Z of the shell body 3211, and the two second shell portions 312 can be rotationally symmetric about the center line in the third direction Z of the shell body 3211, so that the two second shell portions 312 can be arranged close to the two ends of the first shell portion 311 in the second direction Y, respectively.

[0193] When the plurality of battery monomers 100 are arranged in the first direction X, the two adjacent second shell portions 312 of the two adjacent battery monomers 100 in the first direction X can be arranged in the second direction Y to share the space between the two first shell portions 311 of the two battery monomers 100, reduce the probability of interference between the two adjacent second shell portions 312 of the adjacent battery monomers 100, further compact the structure, reduce the space occupation, and improve the energy density of the battery device 1000.

[0194] In the above technical solution, the two extension plates 3212 and the two end covers 322 are both rotationally symmetric about the center line in the third direction Z of the shell body 3211, so that the two second shell portions 312 can be rotationally symmetric about the center line in the third direction Z of the shell body 3211, and when the plurality of battery monomers 100 are arranged in the first direction X, the two adjacent second shell portions 312 of the two adjacent battery monomers 100 in the first direction X can be arranged in the second direction Y to share the space between the two first shell portions 311 of the two battery monomers 100, reduce the space occupation, and improve the energy density of the battery device 1000.

[0195] In some embodiments of the present application, the main shell 321 is welded to the end cover 322.

[0196] In the above technical solution, the main shell 321 is welded to the end cover 322, which can improve the connection strength between the main shell 321 and the end cover 322, improve the sealing performance between the main shell 321 and the end cover 322, and improve the assembly efficiency of the battery monomer 100 and the production efficiency.

[0197] In some embodiments of the present application, the electrode assembly 10 of the battery monomer 100 is formed by laminating a plurality of pole pieces by a lamination process, and further, the width of the tab 12 in the third direction Z can be equal to the width of the electrode body 11 in the third direction Z.

[0198] In some embodiments of the present application, the electrode assembly 10 of the battery cell 100 is formed by winding the electrode tab, specifically, the electrode assembly 10 is a winding-shaped flat cell, the electrode tab 12 can be formed by a die-cutting process, and the width of the electrode tab 12 can be less than or equal to the width of the electrode body 11.

[0199] In a second aspect, the embodiments of the present application also provide a battery device 1000, comprising: a box body 200 and a plurality of battery cells 100, the plurality of battery cells 100 are arranged in the box body 200, and the battery cell 100 is the battery cell 100 of any one of the above embodiments.

[0200] In the above technical solution, since the battery is arranged in the power consumption device 1, and since the electrode tab 12 of the battery cell 100 extends along the extension direction of the electrode body 11, the pole 20 is arranged on one side of the electrode tab 12 in the thickness direction and connected with the electrode tab 12, so that the connection between the electrode tab 12 and the pole 20 can be realized without bending the electrode tab 12, thereby the process of bending the electrode tab 12 of the battery cell 100 in the assembly process can be reduced, the assembly efficiency of the battery cell 100 can be improved, the probability of the electrode tab 12 being broken due to bending can be reduced, the reliability of the battery cell 100 can be improved, the stability of the current on the electrode tab 12 in the electrode assembly 10 being transported to the pole 20 can be improved, the loss of the current capacity of the battery cell 100 caused by the breakage of the electrode tab 12 can be reduced, and the charge-discharge efficiency of the battery cell 100 can be improved.

[0201] In some embodiments of the present application, as shown in Figure 8 At least part of the battery cells 100 are arranged in sequence along the first direction X and connected in sequence.

[0202] In some examples, the plurality of battery cells 100 are arranged in sequence along the first direction X and connected in sequence to form a battery pack, and the plurality of battery packs are arranged in sequence along the second direction Y.

[0203] In the above technical solution, since at least part of the battery cells 100 are arranged in sequence along the first direction X, the distance between the two adjacent poles 20 of the two adjacent battery cells 100 can be reduced, the arrangement structure between the plurality of battery cells 100 can be compacted, the space occupation can be reduced, and the electrical connection between the adjacent battery cells 100 in the first direction X can be facilitated.

[0204] In some embodiments of the present application, in the first direction X, the two adjacent poles 20 of the two adjacent battery cells 100 are arranged opposite to each other in the second direction Y and have opposite polarities, and are electrically connected through the connecting piece.

[0205] In some examples, the two adjacent poles 20 of the two adjacent battery monomers 100 are arranged in the second direction Y with a spacing and face each other, and the two poles 20 face each other in the second direction Y, so that the probability of interference between the two adjacent poles 20 can be reduced, and the two adjacent poles 20 can share the space between the two first shell parts 311 of the two battery monomers 100, further compact structure, reduce the space occupation, and improve the energy density of the battery device 1000.

[0206] Since the polarities of the two adjacent poles 20 are opposite, the series connection between the two adjacent battery monomers 100 can be realized by connecting the two adjacent poles 20, so that the distance between the two connected poles 20 can be reduced, the size of the connecting member can be reduced, the resistance of the connecting member can be reduced, the energy loss can be reduced, the charging and discharging performance of the battery device 1000 can be improved, and the connection reliability between the adjacent poles 20 of the adjacent battery monomers 100 can be improved.

[0207] In the above technical solution, since the two adjacent poles 20 of the two adjacent battery monomers 100 are arranged in the second direction Y with a spacing and face each other, and the polarities are opposite, the probability of interference between the two adjacent poles 20 can be reduced, and the two adjacent poles 20 can share the space between the two first shell parts 311 of the two battery monomers 100, further compact structure, reduce the space occupation, and improve the energy density of the battery device 1000, and the distance between the two connected poles 20 can be reduced, the size of the connecting member can be reduced, the resistance of the connecting member can be reduced, the energy loss can be reduced, the charging and discharging performance of the battery device 1000 can be improved, and the connection reliability between the adjacent poles 20 of the adjacent battery monomers 100 can be improved.

[0208] In a third aspect, the embodiments of the present application also provide a power utilization device 1 comprising the battery device 1000 of any of the above embodiments.

[0209] In the above technical solution, since the power utilization device 1 is provided with the battery device 1000, and since the tab 12 of the battery monomer 100 of the battery device 1000 extends along the extension direction of the electrode main body 11, the pole column 20 is arranged on one side of the tab 12 in the thickness direction and connected with the tab 12, so that the connection between the tab 12 and the pole column 20 can be achieved without bending the tab 12, thereby reducing the process of bending the tab 12 of the battery monomer 100 in the assembly process, improving the assembly efficiency of the battery monomer 100, reducing the probability of the tab 12 being broken due to bending, improving the reliability of the battery monomer 100, and also improving the stability of the current on the pole piece in the electrode assembly 10 being transmitted to the pole column 20 through the tab 12, reducing the loss of the current capacity of the battery monomer 100 caused by the breakage of the tab 12, and improving the charge-discharge efficiency of the battery monomer 100, thereby improving the overall performance of the power utilization device 1.

[0210] Hereinafter, the battery device 1000 according to an embodiment of the present application will be described with reference to the accompanying drawings. Figures 2-10 The battery device 1000 according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0211] Referring to Figure 2 , the battery device 1000 includes a box body 200 and a plurality of battery monomers 100, the box body 200 includes a box main body 210 and a cover plate 220, the top of the box main body 210 is open, and the cover plate 220 is arranged on the top of the box main body 210, and the cover plate 220 cooperates with the box main body 210 to define a layout space for accommodating the battery monomers 100. The plurality of battery monomers 100 are arranged in the box body 200 in sequence along the first direction X and the second direction Y.

[0212] Specifically, as shown in Figures 6-7 , the battery monomer 100 includes a shell 30, an electrode assembly 10, a pole column 20, a first insulating piece 40, a second insulating piece 50, and a riveting block 60.

[0213] The shell 30 includes a first shell part 311 and two second shell parts 312, the first shell part 311 and the second shell part 312 are both rectangular box shapes, the two second shell parts 312 are respectively connected to the two ends of the first shell part 311 in the first direction X and are arranged in the second direction Y, in the second direction Y, the opposite side surfaces of the two second shell parts 312 are flush with the two side surfaces of the first shell part 311, and the opposite side surfaces of the two first shell parts 311 are both located between the two side surfaces of the first shell part 311. Among them, the first shell part 311 defines a first cavity 3011, and the second shell part 312 defines a second cavity 3012, and the second cavity 3012 opens to the side of the first cavity 3011 in the first direction X to communicate with the first cavity 3011.

[0214] The electrode assembly 10 comprises an electrode body 11 and two tab ears 12, the tab ear 12 comprises a folding section 121 and a welding section 122, the folding section 121 is connected between the electrode body 11 and the tab ear 12, wherein the electrode body 11 and the folding section 121 are arranged in the first cavity 3011, the welding section 122 extends in a straight line in the first direction X and is arranged in the second cavity 3012.

[0215] The opposite side of the two second shell parts 312 is formed with a mounting hole penetrating through the second shell part 312, the pole post 20 is arranged in the mounting hole, the first insulating part 40 is arranged in the second cavity 3012 and located between the pole post 20 and the inner wall of the second cavity 3012 and the circumferential wall of the mounting hole, the second insulating part 50 is arranged on the outer side of the second shell part 312 and located between the pole post 20 and the outer side surface of the second shell part 312, and the riveting block 60 is further arranged between the second insulating part 50 and the pole post 20, and the riveting block 60 can be welded with the pole post 20. Among them, one of the two pole posts 20 is a positive pole post and the other is a negative pole post, and the positive pole post and the negative pole post are arranged in the second direction Y, and the distance between the positive pole post and the negative pole post is greater than or equal to 0.5mm.

[0216] The assembly process of the battery device 1000 and the battery cell 100 of the embodiment is described below.

[0217] When the electrode assembly 10 of the battery cell 100 of the embodiment is a laminated electrode assembly 10, the coating and cold pressing process of the cathode sheet and the anode sheet can adopt the coating and cold pressing process in the prior art, and the foil area beside the active material of the cathode sheet and the anode sheet does not need to be trimmed and die cut, and the whole foil area is the tab ear 12, and then the laminating process is performed to form the electrode assembly 10.

[0218] When the electrode assembly 10 of the battery cell 100 of the embodiment is a winding electrode assembly 10, after the electrode sheet is wound and formed, die cutting is performed on the winding bending area, so that one tab ear sheet is formed from one winding of the electrode sheet, and the width of the tab ear sheet is substantially equal to the width of the electrode body 11.

[0219] After laminating or winding forming, the tab ear 12 is folded and ultrasonic welded, specifically, the tab ear sheets are ultrasonic seam welded between the tab ear sheets to form a rectangular or circular welding mark. Among them, in the first direction X, the length of the welding section 122 of the tab ear 12 is greater than or equal to 3mm and less than or equal to 6mm, so as to improve the energy density of the battery cell 100.

[0220] The tab 12 is laser welded with the pole 20 after being ultrasonic welded into a strip-shaped weld, or the tab 12 is laser welded with the pole 20 through an adapter. It should be noted that when the electrode assembly 10 is placed in the shell 30, the welded section 122 of the tab 12 directly lies in the shell 30 along the first direction X without being bent. Further, the tabs 12 at both ends of the electrode assembly 10 are arranged close to the two side surfaces of the electrode body 11, one of which is the anode tab 12 and the other is the cathode tab 12, so that the two poles 20 of the battery monomer 100 in the second direction Y are the positive pole and the negative pole, respectively.

[0221] When the battery monomer 100 is assembled into the box 200, since the battery monomer 100 is Z-shaped, a plurality of battery monomers 100 can be arranged in sequence along the first direction X, so that the two adjacent poles 20 of the adjacent two battery monomers 100 are the positive pole and the negative pole, respectively, and are directly opposite in the second direction Y, and are connected between the adjacent two positive poles and negative poles through the connecting piece, realizing the sequential arrangement and series connection of the plurality of battery monomers 100 along the first direction X.

[0222] According to the battery device 1000 of the embodiment of the present application, the tab 12 does not need to be folded after welding and is directly laid in the shell 30, and then is welded with the pole 20, which can solve the problem of tab 12 breakage caused by tab 12 folding, and the plurality of battery monomers 100 are arranged along the first direction X, which can improve the energy density of the battery device 1000.

[0223] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell (100), characterized by The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly.

2. The battery cell (100) according to claim 1, characterized in that The application relates to a battery electrode assembly. The application relates to a battery electrode assembly.

3. The battery cell (100) according to claim 2, characterized in that The application relates to a battery electrode assembly.

4. The battery cell (100) according to claim 3, characterized in that The application relates to a battery electrode assembly.

5. The battery cell (100) according to claim 4, characterized in that The application relates to a battery electrode assembly.

6. The battery cell (100) according to claim 5, characterized in that The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. 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The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a battery electrode assembly. The application relates to a 7. The battery cell (100) according to claim 3, characterized in that The ratio of the height of the second shell part (312) in the second direction (Y) to the height of the first shell part (311) in the second direction (Y) is less than 1 / 2.

8. The battery cell (100) according to claim 2, characterized in that One side surface of the second shell part (312) in the second direction (Y) is flush with one side surface of the first shell part (311) in the second direction (Y).

9. The battery cell (100) according to claim 2, characterized in that The projections of the two second shell parts (312) in the first direction (X) are completely staggered.

10. The battery cell (100) according to claim 2, characterized in that The tab (12) comprises a folding section (121) and a welding section (122), the folding section (121) is connected between the welding section (122) and the electrode body (11), the welding section (122) extends in a straight line in the first direction (X), Wherein, at least part of the folding section (121) is arranged in the first cavity (3011), the welding section (122) is arranged in the second cavity (3012), and the post (20) is connected with the welding section (122).

11. The battery cell (100) according to claim 10, characterized in that The welding section (122) comprises a plurality of tab (12) pieces arranged in layers in the second direction (Y), and the plurality of tab (12) pieces are connected by ultrasonic roll welding to form the welding section (122).

12. The battery cell (100) according to claim 10, characterized in that The welding sections (122) of the two tabs (12) are respectively arranged near the two side surfaces of the electrode body (11) in the second direction (Y).

13. The battery cell (100) according to claim 10, characterized in that In the first direction (X), the length of the welding section (122) is greater than or equal to 3mm.

14. The battery cell (100) according to claim 13, characterized in that In the first direction (X), the length of the welding section (122) is less than or equal to 6mm.

15. The battery cell (100) according to claim 2, characterized in that The shell (30) comprises a main shell (321) and end covers (322), the two ends of the main shell (321) are open in the first direction (X), and the number of the end covers (322) is two and each covers the open end of the main shell (321).

16. The battery cell (100) according to claim 15, characterized in that The main shell (321) comprises a shell body (3211) and extension plates (3212), the shell body (3211) extends in the first direction (X) and has a rectangular cross section, the extension plates (3212) are two and are respectively connected to the two ends of the shell body (3211) and extend away from the shell body (3211) in the direction, and the cross section of the extension plate (3212) is a U-shaped opening towards one side in the second direction (Y), The end cover (322) comprises a first plate section (3221), a second plate section (3222) and a third plate section (3223) connected in sequence, the first plate section (3221) and the third plate section (3223) both extend in the second direction (Y) and are arranged at intervals in the first direction (X), the second plate section (3222) extends in the first direction (X), the first plate section (3221) and the third plate section (3223) are respectively arranged on the two sides of the second plate section (3222) in the second direction (Y), and the two ends of the second plate section (3222) in the first direction (X) are respectively connected with the first plate section (3221) and the third plate section (3223), The shell body (3211) cooperates with the third plate segment (3223) to enclose the first cavity (3011), and the first plate segment (3221), the second plate segment (3222) and the extension plate (3212) cooperate to enclose the second cavity (3012).

17. The battery cell (100) according to claim 16, characterized in that The two extension plates (3212) and the two end covers (322) are rotationally symmetrically arranged about a center line in a third direction (Z) of the shell body (3211), and the third direction (Z), the second direction (Y) and the first direction (X) are perpendicular to each other.

18. The battery cell (100) according to claim 16, characterized in that The main shell (321) is welded to the end cover (322).

19. A battery device (1000) characterized by comprising: It comprises: a box (200); a plurality of battery monomers (100), the plurality of battery monomers (100) are arranged in the box (200), and the battery monomer (100) is the battery monomer (100) according to any one of claims 1-18.

20. The battery device (1000) according to claim 19, characterized by At least part of the battery monomers (100) are arranged in sequence along the first direction (X) and are connected in sequence.

21. The battery device (1000) according to claim 20, characterized by In the first direction (X), the two adjacent pole columns (20) of the two adjacent battery monomers (100) are arranged opposite to each other in the second direction (Y) and have opposite polarities, and are electrically connected through a connecting piece.

22. An electrically powered device (1) characterized by It comprises the battery device (1000) according to any one of claims 19-21. It comprises the battery device (1000) according to any one of claims 19-21.

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