Battery cells, battery devices, power consumption devices and energy storage devices

Abstract

A battery cell, a battery device, an electrical device and an energy storage device, belonging to the field of battery technology. The battery cell includes a shell, a pole assembly and an electrode assembly, the shell having two first side walls opposite to each other in a first direction; the pole assembly is arranged on the first side wall; the electrode assembly is arranged in the shell, the electrode assembly includes an electrode body and a pole ear arranged at the end of the electrode body in a second direction, the pole ear is connected to the pole assembly, and the outer surface of at least one first side wall is formed with a concave cavity recessed along the first direction, the concave cavity is completely staggered with the projection of the pole ear in the first direction, the pole ear is at least partially staggered with the projection of the pole assembly in the first direction, the part of the pole assembly staggered with the pole ear corresponds to the concave cavity in the first direction, and the first direction and the second direction intersect. The size of the pole assembly of the battery cell of the present application can be set larger, which is conducive to increasing the connection area between the pole assembly and the confluence component, the structure is more reasonable, and the use effect is better.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. Among them, power batteries include several battery cells. However, the structure of battery cells is not reasonable, so the use effect of battery devices needs to be further improved. Summary of the invention

[0003] The embodiments of the present invention provide a battery cell, a battery device, an electric device and an energy storage device, which have a more reasonable structure and a better use effect.

[0004] In the first aspect, an embodiment of the present invention provides a battery cell, comprising: a shell having two first side walls opposite to each other in a first direction; a pole assembly, the pole assembly being arranged on the first side wall; an electrode assembly, the electrode assembly being arranged in the shell, the electrode assembly comprising a pole ear and an electrode body, the pole ear being arranged at the end of the electrode body in the second direction, the pole ear being connected to the pole assembly, wherein a concave cavity recessed along the first direction is formed on the outer surface of at least one of the first side walls, the concave cavity is completely staggered from the projection of the pole ear in the first direction, the pole ear is at least partially staggered from the projection of the pole assembly in the first direction, the portion of the pole assembly staggered from the pole ear corresponds to the concave cavity in the first direction, and the first direction and the second direction intersect.

[0005] In the above technical solution, by making the projection of the cavity and the pole ear in the first direction completely staggered, the projection of the pole ear and the pole assembly in the first direction are at least partially staggered, and the part of the pole assembly staggered from the pole ear corresponds to the cavity in the first direction, that is, the cavity only corresponds to the part of the pole assembly staggered from the pole ear, but not to the pole assembly and the pole ear at the same time. In this way, the size of the cavity in the first direction can be set larger to accommodate a larger-sized pole assembly, thereby facilitating the increase of the connection area between the pole assembly and the busbar component and increasing the connection reliability.

[0006] In some embodiments, the battery cell further includes a switching piece, and the pole lug and the pole column assembly are completely staggered in the third direction and connected via the switching piece.

[0007] In the above technical solution, the size of the cavity in the third direction can be as large as possible, so that the size of the pole assembly can be set as large as possible. On the one hand, it is beneficial to increase the connection area between the pole assembly and the shell, and increase the connection stability between the pole assembly and the shell; on the other hand, it is beneficial to increase the connection area between the pole assembly and the busbar component, and increase the connection stability between the pole assembly and the busbar component.

[0008] In some embodiments, in the first direction, a size of the cavity is greater than half a size of the housing.

[0009] In the above technical solution, the cavity can better accommodate the pole assembly so that the size of the pole assembly in the first direction can be as large as possible, which is conducive to increasing the connection area between the pole assembly and the busbar component. At the same time, the cavity can also better accommodate part of the busbar component extending into the cavity, so as to reduce the additional space occupied by the busbar component.

[0010] In some embodiments, the shell includes a first edge and a second edge spaced apart in a third direction. For the connected pole lug and the pole column assembly, in the third direction, the distance between the pole lug and the first edge is smaller than the distance between the pole lug and the second edge, and the distance between the pole column assembly and the second edge is smaller than the distance between the pole column assembly and the first edge. The first direction, the second direction and the third direction intersect each other.

[0011] In the above technical solution, a cavity with the largest possible size can be formed on one side of the housing, thereby facilitating the accommodation of a larger-sized pole assembly.

[0012] In some embodiments, two pole assemblies are provided, and the two pole assemblies are respectively arranged at two ends of the shell in the second direction and at two ends of the shell in the third direction, and the first direction, the third direction and the second direction intersect each other.

[0013] In the above technical solution, when the busbar component connects two battery cells, it has a good fixing effect on both sides of the two battery cells in the third direction. The restraining force of the two busbar components on the two battery cells is relatively uniform, which is beneficial to reduce the possibility of relative displacement of the two battery cells.

[0014] In some embodiments, the pole assembly and the concave cavity are respectively arranged on side walls of the shell on both sides in the first direction.

[0015] In the above technical solution, when installing the pole assembly, the shell has less interference with the movement of the fixing tooling and the installation tooling of the pole assembly. Therefore, it is more convenient to install the pole assembly, which is conducive to reducing the difficulty of installing the pole assembly.

[0016] In some embodiments, the battery cell also includes an insulating member, which includes a first part and a second part arranged in a third direction. In the first direction, the first part is at least arranged on a side of the pole ear facing away from the adapter plate for insulation between the pole ear and the shell, and the second part is at least arranged on a side of the adapter plate facing away from the pole column assembly for insulation between the adapter plate and the shell. The first direction, the second direction and the third direction intersect each other.

[0017] In the above technical solution, an insulating member is provided to achieve insulation between the pole ear and the shell, and between the adapter and the shell, so as to reduce the possibility of short circuit of the battery cell and the possibility of safety accidents.

[0018] In some embodiments, in the first direction, a size of the second portion is smaller than a size of the first portion.

[0019] In the above technical solution, the size of the second part in the first direction is relatively small, that is, the space occupied by the second part in the first direction is reduced, so as to facilitate making the size of the cavity in the first direction as large as possible.

[0020] In some embodiments, the shell includes a shell portion and a cover body, the shell portion is formed as an opening on one side in the first direction, the cover body is covered on the opening, the cover body is the wall surface with the largest area of ​​the shell, and the pole assembly is arranged on the cover body.

[0021] In the above technical solution, the side wall of the cover body is the wall with the largest area of ​​the shell. In this way, the processing difficulty of the cover body and the shell is small and it is easy to form, which is beneficial to reduce the production cost of the battery cell; the pole assembly is arranged on the cover body. In this way, the installation difficulty of the pole assembly is small, and the installation tooling of the pole assembly is not easy to interfere with the shell during operation, and the design of the installation tooling is more flexible.

[0022] In a second aspect, an embodiment of the present invention further provides a battery device, comprising a busbar component and the above-mentioned battery cells, wherein a plurality of the battery cells are stacked in the first direction, the busbar component is connected between the pole assemblies of the plurality of the battery cells, and the pole assemblies of the battery cells are arranged in the concave cavities of the battery cells adjacent thereto.

[0023] In the above technical solution, since the structure of the battery cell according to the embodiment of the present application is more reasonable, it is beneficial to improve the use effect of the battery device.

[0024] In some embodiments, the busbar component partially extends into the concave cavity, and in the first direction, the portion of the busbar component extending into the concave cavity is located between the pole assembly and a wall surface of the concave cavity of an adjacent battery cell.

[0025] In the above technical solution, the portion of the busbar component extending into the cavity can share part of the space with the shell in the second direction, which can reduce the additional space occupied by the busbar component in the second direction, thereby helping to reduce the space occupied by the battery device formed by multiple battery cells, and further helping to improve the energy density of the battery device.

[0026] In some embodiments, the conduit component includes a base portion, a first plate and a second plate, the first plate and the second plate are arranged relatively to each other in the first direction, the base portion is located on one side of the shell in the second direction and outside the concave cavity, at least a portion of the first plate and at least a portion of the second plate are located in the concave cavity; in the second direction, one end of the first plate located in the concave cavity is connected to one end of the second plate located in the concave cavity, and the other end of the first plate and the other end of the second plate are respectively connected to the two base portions.

[0027] In the above technical solution, the shell can share part of the space with the first plate and the second plate in the second direction, which can reduce the extra space occupied by the first plate and the second plate, thereby helping to reduce the space occupied by the battery device formed by multiple battery cells, and further helping to improve the energy density of the battery device.

[0028] In some embodiments, the pole assembly includes a first component and a second component, the first component passes through the shell wall and is used to be electrically connected to the pole ear, the second component is located outside the shell and protrudes from the first component away from the shell, and the second component is used to be electrically connected to the busbar component.

[0029] In the above technical solution, by setting the second component, on the one hand, it is beneficial to increase the connection area between the pole assembly and the busbar component, increase the connection stability between the pole assembly and the busbar component, thereby improving the reliability of the battery device; on the other hand, it can make the design of the busbar component more flexible to meet the needs of reducing the processing difficulty of the busbar component or improving the tensile strength of the busbar component.

[0030] In some embodiments, the collector component includes a connected collective portion and a convex portion, the base portion is located on one side of the shell in the second direction and outside the concave cavity, the convex portion protrudes toward the pole assembly in the second direction and the convex portion is at least partially located in the concave cavity, and the pole assembly is connected to the convex portion.

[0031] In the above technical solution, a convex portion at least partially located in the concave cavity is provided to connect with the pole assembly, so that the size of the pole assembly in the second direction does not need to be set too large, so that the structural strength of the pole assembly is higher and it is not easy to break; at the same time, in some embodiments, the provision of the convex portion is also beneficial to increase the buffering performance of the convergence component itself and improve the tensile strength of the convergence component.

[0032] In some embodiments, the shell includes a shell portion and a cover body that cover each other, the shell portion includes a first flange, the first flange and the cover body are connected to form a flange connecting portion, and an insulating layer is provided at least between the flange connecting portion and the collector component, and the collector component is abutted against the flange connecting portion through the insulating layer.

[0033] In the above technical solution, by setting a connected first flange, it is beneficial to increase the connection area between the shell and the cover, thereby helping to increase the structural stability and sealing of the shell; at the same time, the setting of the insulating layer can reduce the possibility of direct contact between the busbar component and the shell, especially the possibility of direct contact between the flange connection part and the shell, reduce the possibility of unexpected situations such as short circuit and conduction between the busbar component and the shell, and improve the reliability of the battery device.

[0034] In a third aspect, an embodiment of the present invention further provides an electrical device, comprising the above-mentioned battery device, wherein the battery device is used to provide electrical energy for the electrical device.

[0035] In the above technical solution, since the performance of the battery device is improved, it is beneficial to improve the working power performance of the power-consuming device.

[0036] In a fourth aspect, an embodiment of the present invention further provides an energy storage device, comprising a plurality of the above-mentioned battery devices.

[0037] In the above technical solution, since the performance of the battery device is improved, it is beneficial to improve the working performance of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0039] Figure 2 An exploded view of a battery device provided in some embodiments of the present application;

[0040] Figure 3 An exploded view of a battery cell provided for some embodiments of the present application;

[0041] Figure 4 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0042] Figure 5 for Figure 4 A partial enlarged view of part A;

[0043] Figure 6 A schematic diagram of the structure of two stacked battery cells provided in some embodiments of the present application;

[0044] Figure 7 for Figure 6 A partial enlarged view of part B;

[0045] Figure 8 A partial enlarged view of two stacked battery cells provided in some embodiments of the present application;

[0046] Fig. 9 A side view of two stacked battery cells provided for some embodiments of the present application;

[0047] Fig.10 for Fig. 9 Middle CC section;

[0048] Fig.11 A cross-sectional view of two stacked battery cells provided in some embodiments of the present application;

[0049] Fig.12 A schematic diagram of the structure of an energy storage device provided in some embodiments of the present application.

[0050] Reference numerals:

[0051] Vehicle 1000; Energy storage device 2000;

[0052] Battery device 100; controller 200; motor 300;

[0053] Box 10;

[0054] A first box 101; a second box 102;

[0055] Battery cell 20;

[0056] Shell 201; cavity 2011; cover 2012; shell portion 2013;

[0057] First flange 2014; first side wall 2016;

[0058] First edge 2017; second edge 2018; opening 2019; flange connection portion 2020;

[0059] Pole assembly 202; first component 2021; second component 2022; third section 2023;

[0060] The first paragraph is 2024; the second paragraph is 2025;

[0061] Electrode assembly 203; pole ear 2031; electrode body 2032; adapter 204;

[0062] Insulating member 205; first portion 2051; second portion 2052; third portion 2053;

[0063] A confluence component 30;

[0064] First plate 301; base portion 302; second plate 303; convex portion 304;

[0065] A third plate 3041; a fourth plate 3042; an insulating layer 305;

[0066] The first direction F1; the second direction F2; the third direction F3. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by technicians in the technical field of the present invention; the terms used in the present invention and the specification of the invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0069] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] The term "and / or" in the present invention is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0072] In the embodiments of the present invention, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present invention shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation to the present invention.

[0073] The term “plurality” used in the present invention refers to two or more (including two).

[0074] The battery apparatus (Battery Apparatus) mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel, or in mixed connection through a busbar component. In some embodiments, the battery cell assembly (Battery Cell Assembly) is generally formed by arranging a plurality of battery cells. As an example, the battery cell assembly may be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by cable ties.

[0075] In some embodiments, the battery device may be a battery pack, which includes a box and one or more battery cell assemblies, and the battery cell assembly is accommodated in the box. As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box. As an example, the battery cell assembly may also be accommodated in the box by directly fixing a plurality of battery cells to the box. As an example, the box may include a first box and a second box. The first box and the second box are buckled together so that a closed space is formed inside the box to accommodate the battery cell assembly. The closure here refers to covering or closing, which may be sealed or unsealed. The first box may be a top cover or a bottom plate. As an example, the box may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that a closed space is formed inside the box to accommodate the battery cell assembly. In some embodiments, the box may be used as part of the chassis structure of the vehicle. For example, part of the box may become at least a part of the floor of the vehicle, or part of the box may become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0076] The embodiment of the present application provides an energy storage device, including one or more battery clusters (Battery Cluster) to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, and the multiple battery devices are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0077] In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery or a solid-state battery, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, rectangular or in other shapes, etc., and the embodiments of the present application do not limit this.

[0078] The battery cell includes a shell component, an electrode component and an electrolyte (in a solid-state battery, it can be a solid electrolyte layer located between the positive and negative electrodes). The electrode component includes at least one electrode assembly. The electrode assembly and the electrolyte are both contained in the shell component. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator (this structure can be omitted in a solid-state battery). The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.

[0079] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab sheet. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0080] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. The material of the isolation film may be PP, polypropylene or PE, polyethylene, etc. The electrode assembly mentioned in the embodiment of the present application is a winding or laminated structure.

[0081] The electrode assembly can be a wound structure or a laminated structure. During processing, the positive electrode sheet, the negative electrode sheet and the separator are wound or laminated in sequence to obtain the electrode assembly. In the electrode assembly, a plurality of positive electrode tabs are laminated together and electrically connected to the positive electrode column assembly, and a plurality of negative electrode tabs are laminated together and electrically connected to the negative electrode column assembly.

[0082] In some battery cells in the related art, the battery cells are stacked together along a set direction, the pole assembly is arranged on one side of the shell in the stacking direction, and the part of the shell corresponding to the pole assembly is formed with a cavity to accommodate the pole. However, the pole assembly and the pole lug connected in the battery cell are usually stacked along the set direction, which results in the size of the cavity formed by the shell for accommodating the pole assembly being small in the set direction, which in turn results in the size of the pole assembly being small in the set direction, so that the connection area between the pole assembly and the current collecting component is also small, and the connection reliability is poor.

[0083] In view of this, an embodiment of the present application proposes a battery cell, which includes a shell, a pole assembly and an electrode assembly, the shell having a first side wall opposite to each other in a first direction, and the pole assembly is arranged on the first side wall; the electrode assembly is arranged in the shell, and the electrode assembly includes a pole ear and an electrode body, the pole ear is arranged at the end of the electrode body in a second direction, and the pole ear is connected to the pole assembly, wherein an outer surface of at least one first side wall is formed with a concave cavity recessed along the first direction, the concave cavity is completely staggered with a projection of the pole ear in the first direction, the pole ear is at least partially staggered with a projection of the pole assembly in the first direction, the portion of the pole assembly staggered with the pole ear corresponds to the concave cavity in the first direction, and the first direction and the second direction intersect.

[0084] In the battery cell of the above-mentioned structure, by making the projection of the cavity and the pole lug in the first direction completely staggered, the projection of the pole lug and the pole assembly in the first direction are at least partially staggered, and the portion of the pole assembly staggered from the pole lug corresponds to the cavity in the first direction, that is, the cavity only corresponds to the portion staggered between the pole assembly and the pole lug, but not to both the pole assembly and the pole lug. In this way, the size of the cavity in the first direction can be set larger to accommodate a pole assembly of a larger size, so as to increase the connection area between the pole assembly and the busbar component and increase the connection reliability.

[0085] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices including battery cells, power-consuming devices using the battery devices, and energy storage devices.

[0086] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0087] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low power consumption and provide electrical energy to relevant users or electrical equipment during peak power consumption. The energy storage system provided in the embodiment of the present application can be any power system that requires the use of an energy storage device.

[0088] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0089] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery device 100, and the battery device 100 can be provided at a position such as the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can be used as an operating power source for the vehicle 1000.

[0090] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery device 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0091] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0092] Please refer to Fig.12 , Fig.12 The schematic diagram of the structure of the energy storage device 2000 provided in some embodiments of the present application, the energy storage device 2000 is provided with a battery device 100. In some embodiments, the energy storage device 2000 may be an energy storage container or an energy storage cabinet. In some embodiments, the energy storage device 2000 may include a cabinet and one or more battery clusters, the battery clusters are accommodated in the cabinet, and the battery clusters may include multiple battery devices 100.

[0093] Please refer to Figure 2 , Figure 2 The exploded view of the battery device 100 provided in some embodiments of the present application includes a battery cell 20 and a box 10 for accommodating the battery cell 20. The box 10 can be in various structural forms.

[0094] In some embodiments, the box 10 may include a first box 101 and a second box 102, the first box 101 and the second box 102 cover each other, and the first box 101 and the second box 102 together define a storage space for accommodating the battery cell 20. A sealing member may also be provided at the connection position between the first box 101 and the second box 102 to achieve a sealed connection between the first box 101 and the second box 102. For example, referring to Figure 2 , the first box 101 and the second box 102 can both be hollow structures with one side open, and the open side of the first box 101 covers the open side of the second box 102, so as to form a box 10 with a storage space. For another example, the second box 102 can be a hollow structure with one side open, and the first box 101 is in the form of a cover and can cover the open side of the second box 102. The box 10 can be in various shapes, such as a cylindrical box, a rectangular box, etc.

[0095] Please refer to Figure 3 , Figure 3 An exploded view of a battery cell 20 provided in some embodiments of the present application. Figure 4 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of the present application. Figure 5 for Figure 4 A partial enlarged view of part A. Figure 6 A schematic diagram of the structure of two stacked battery cells 20 provided in some embodiments of the present application. Figure 7 for Figure 6 A partial enlarged view of part B. Figure 8 A partially enlarged view of two stacked battery cells 20 provided in some embodiments of the present application. Fig. 9 A side view of two stacked battery cells 20 provided for some embodiments of the present application. Fig.10 for Fig. 9 Middle CC section. Fig.11 A cross-sectional view of two stacked battery cells 20 provided in some embodiments of the present application.

[0096] The battery cell 20 of the embodiment in the figure is in a rectangular form, the thickness direction of the battery cell 20 is a first direction F1, the length direction of the battery cell 20 is a second direction F2, and the width direction of the battery cell 20 is a third direction F3. The first direction F1, the third direction F3 and the second direction F2 are perpendicular to each other.

[0097] Combination Figures 3 to 11 The battery cell 20 may include a shell 201 , a pole assembly 202 and an electrode assembly 203 .

[0098] Combination Figures 3 to 11 The shell 201 has two first side walls 2016 opposite to each other in the first direction F1, the pole assembly 202 is arranged on the first side wall 2016, the electrode assembly 203 is arranged in the shell 201, and the electrode assembly 203 includes a pole ear 2031 and an electrode body 2032, the pole ear 2031 is arranged at the end of the electrode body 2032 in the second direction F2, the electrode body 2032 is connected to the pole ear 2031, and the pole ear 2031 is connected to the pole assembly 202, wherein at least A first side wall 2016 has an outer surface formed with a cavity 2011 recessed along a first direction F1, the cavity 2011 is completely offset from a projection of the pole ear 2031 in the first direction F1, the pole ear 2031 is at least partially offset from a projection of the pole column assembly 202 in the first direction F1, the portion of the pole column assembly 202 offset from the pole ear 2031 corresponds to the cavity 2011 in the first direction F1, and the first direction F1, the third direction F3 and the second direction F2 intersect each other.

[0099] For example, reference may be made to Figure 3 and Figure 4 The shell 201 may include a cover body 2012 and a shell portion 2013 , wherein the cover body 2012 covers an opening 2019 on one side of the shell portion 2013 to form a receiving cavity for receiving the electrode assembly 203 .

[0100] The pole assembly 202 includes a positive pole assembly and a negative pole assembly. The positive pole assembly and the negative pole assembly can be simultaneously arranged on the same first side wall 2016, and correspondingly, two concave cavities 2011 are formed, and the two concave cavities 2011 are also formed on the same first side wall 2016; or, the positive pole assembly and the negative pole assembly can also be separately arranged on the two side walls of the shell 201 in the first direction F1, and correspondingly, two concave cavities 2011 are formed, and the two concave cavities 2011 are also formed on the same first side wall 2016.

[0101] The positive electrode column assembly and the negative electrode column assembly are both disposed on one of the side walls of the housing 201 in the first direction F1 , which helps to reduce the difficulty of combining multiple battery cells 20 into the battery device 100 .

[0102] The pole assembly 202 is arranged on the first side wall 2016. The shell 201 and the pole assembly 202 are separate components, which are assembled and connected. In this way, the shell 201 and the pole assembly 202 can be processed separately, which facilitates the processing of the two and facilitates the processing and manufacturing of the battery cell 20.

[0103] The portion of the current collector in the electrode assembly 203 coated with the active material layer forms an active material coating portion, which is further processed to form an electrode body 2032, and the portion not coated with the active material layer forms a pole lug sheet. The pole lug 2031 includes multiple layers of pole lug sheets stacked along the first direction F1.

[0104] The pole lug 2031 is connected to the pole assembly 202, for example, the pole lug 2031 and the pole assembly 202 are connected by an adapter 204 (for example, a metal adapter) to facilitate the pole lug 2031 and the pole assembly 202 to be at least partially staggered in the third direction F3. Exemplarily, in some embodiments, the adapter 204 can also be eliminated, and the size of the portion of the pole assembly 202 located in the housing 201 in the third direction F3 can be increased, so that the pole assembly 202 is directly connected to the pole lug 2031.

[0105] The projections of the cavity 2011 and the pole lug 2031 in the first direction F1 are completely offset, which can be understood as the projection of the pole lug 2031 in the first direction F1 and the projection of the cavity 2011 in the first direction F1 are offset in the third direction F3; in other words, the cavity 2011 and the pole lug 2031 are arranged sequentially in the third direction F3.

[0106] The projection of the pole ear 2031 and the pole assembly 202 in the first direction F1 are at least partially offset. It can be understood that the projection of the pole ear 2031 in the first direction F1 and the projection of at least part of the pole assembly 202 in the first direction F1 are offset in the third direction F3; in other words, the pole ear 2031 and at least part of the pole assembly 202 are arranged sequentially in the third direction F3.

[0107] The pole assembly 202 is arranged on the first side wall 2016 of the shell 201 in the first direction F1, and the pole ear 2031 is arranged at the end of the electrode body 2032 in the second direction F2. The portion of the pole assembly 202 that is staggered from the pole ear 2031 corresponds to the cavity 2011 in the first direction F1, and the cavity 2011 can be used to accommodate at least part of the pole assembly 202. Therefore, the pole assembly 202 can share at least part of the space in the second direction F2 with the shell 201 without occupying additional space in the second direction F2, which is beneficial to reducing the space occupied by the battery cell 20 and improving the energy density of the battery device 100.

[0108] The first direction F1, the second direction F2 and the third direction F3 intersect each other, for example, the first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other; or, the angle between the first direction F1 and the second direction F2 is 80°, 70°, 60°, 50°, 40°, 30°, 20°, etc., the angle between the first direction F1 and the third direction F3 is 80°, 70°, 60°, 50°, 40°, 30°, 20°, etc., and the angle between the second direction F2 and the third direction F3 is 80°, 70°, 60°, 50°, 40°, 30°, 20°, etc. The outer surface of the first side wall 2016 is formed with a cavity 2011 recessed along the first direction F1. The circumferential side wall of the cavity 2011 may have only one side wall open, or multiple side walls of the circumferential side wall of the cavity 2011 may be open. This facilitates the connection between the confluence component 30 and the pole assembly 202 located in the cavity 2011.

[0109] The portion of the pole assembly 202 staggered from the pole ear 2031 corresponds to the concave cavity 2011 in the first direction F1, which includes: the pole assembly 202 and the concave cavity 2011 can be respectively arranged on the two first side walls 2016, and the portion of the pole assembly 202 staggered from the pole ear 2031 and the concave cavity 2011 are arranged opposite to each other in the first direction F1 (such as Figures 3 to 11 As shown); alternatively, the pole assembly 202 may also be directly disposed on the inner wall surface of the cavity 2011.

[0110] The pole lug 2031 is at least partially offset from the projection of the pole assembly 202 in the first direction F1, and the portion of the pole assembly 202 that is offset from the pole lug 2031 corresponds to the cavity 2011 in the first direction F1, and the cavity 2011 is completely offset from the projection of the pole lug 2031 in the first direction F1, that is, the cavity 2011 no longer corresponds to the pole lug 2031, so the size of the cavity 2011 in the first direction F1 can be set as large as possible so as to accommodate a pole assembly 202 of a larger size.

[0111] According to the battery cell 20 of the embodiment of the present invention, by making the projections of the pole lug 2031 and the pole assembly 202 in the first direction F1 at least partially staggered, the portion of the pole assembly 202 staggered from the pole lug 2031 corresponds to the cavity 2011 in the first direction F1, and the cavity 2011 is completely staggered from the projection of the pole lug 2031 in the first direction F1, that is, the cavity 2011 only corresponds to the portion of the pole assembly 202 staggered from the pole lug 2031, but does not correspond to the pole assembly 202 and the pole lug 2031 at the same time, so that the size of the cavity 2011 in the first direction F1 can be set larger to accommodate a pole assembly 202 of a larger size, thereby facilitating the increase of the connection area between the pole assembly 202 and the busbar component 30 and increasing the connection reliability.

[0112] According to some embodiments of the present invention, reference may be made to Figure 3 As shown, the battery cell 20 further includes a switching piece 204 , and the pole lug 2031 and the pole assembly 202 are completely staggered in the third direction F3 and connected via the switching piece 204 .

[0113] In other words, the pole lug 2031 and the pole assembly 202 are arranged in sequence in the third direction F3.

[0114] In this way, the size of the cavity 2011 in the third direction F3 can be as large as possible, so that the size of the pole assembly 202 can be set as large as possible, which is beneficial to increase the connection area between the pole assembly 202 and the housing 201 on the one hand, and increase the connection stability between the pole assembly 202 and the housing 201; on the other hand, it is beneficial to increase the connection area between the pole assembly 202 and the busbar 30, and increase the connection stability between the pole assembly 202 and the busbar 30. The pole lug 2031 and the pole assembly 202 are connected through the adapter 204 to adapt to the design that the pole lug 2031 and the pole assembly 202 are completely staggered in the third direction F3.

[0115] According to some embodiments of the present invention, reference may be made to Fig.10 and Fig.11 In the first direction F1 , the dimension D1 of the cavity 2011 is greater than half of the dimension D2 of the housing 201 .

[0116] For example, in the first direction F1 , the size D1 of the cavity 2011 is two-thirds, three-quarters, five-eighths, or any value between two of the values, etc., of the size D2 of the housing 201 .

[0117] In the first direction F1, the size D1 of the cavity 2011 is larger than half the size D2 of the shell 201. In this way, the cavity 2011 can better accommodate the pole assembly 202, so that the size of the pole assembly 202 in the first direction F1 can be as large as possible, so as to increase the connection area between the pole assembly 202 and the busbar component 30.

[0118] According to some embodiments of the present invention, reference may be made to Figure 3 The shell 201 includes a first edge 2017 and a second edge 2018 spaced apart in a third direction F3. For the connected pole ear 2031 and pole assembly 202, in the third direction F3, the distance between the pole ear 2031 and the first edge 2017 is smaller than the distance between the pole ear 2031 and the second edge 2018, and the distance between the pole assembly 202 and the second edge 2018 is smaller than the distance between the pole assembly 202 and the first edge 2017.

[0119] For the connected pole tabs 2031 and pole column assemblies 202, that is, the positive pole tab 2031 and the positive pole column assembly 202 are connected, the negative pole tab 2031 and the negative pole column assembly 202 are connected, the positive pole tab 2031 and the negative pole tab 2031 are spaced apart, and the positive pole column assembly 202 and the negative pole column assembly 202 are spaced apart.

[0120] You can refer to Figure 3 As shown, the distance between the tab 2031 and the first edge 2017 is smaller than the distance between the tab 2031 and the second edge 2018. That is, in the third direction F3, the tab 2031 is not disposed near the middle of the housing 201, but is disposed near both sides of the housing 201. Fig. 9 As shown, the distance between the pole assembly 202 and the second edge 2018 is smaller than the distance between the pole assembly 202 and the first edge 2017, that is, in the third direction F3, the pole assembly 202 is not arranged close to the middle of the housing 201, but close to the two sides of the housing 201. At the same time, in the third direction F3, the pole lug 2031 and the pole assembly 202 are respectively arranged close to different side edges of the housing 201, that is, the projection of the pole lug 2031 and the pole assembly 202 in the first direction F1 is more staggered in the third direction F3.

[0121] In this way, a cavity 2011 of as large a size as possible can be formed on one side of the housing 201 , thereby facilitating the accommodation of a pole assembly 202 of a larger size.

[0122] According to some embodiments of the present invention, two pole assemblies 202 are provided. The two pole assemblies 202 are respectively arranged at two ends of the housing 201 in the second direction F2 and at two ends of the housing 201 in the third direction F3.

[0123] Exemplarily, the size of the battery cell 20 in the first direction F1 , the size of the battery cell 20 in the third direction F3 , and the size of the battery cell 20 in the second direction F2 may increase in sequence.

[0124] The two pole assemblies 202 are respectively arranged at the two ends of the housing 201 in the second direction F2, and are respectively arranged at the two ends of the housing 201 in the third direction F3, that is, one of the two pole assemblies 202 is arranged at one end of the housing 201 in the second direction F2 and one end of the housing 201 in the third direction F3, and the other of the two pole assemblies 202 is arranged at the other end of the housing 201 in the second direction F2 and the other end of the housing 201 in the third direction F3, and the two pole assemblies 202 are distributed diagonally. Correspondingly, there are two pole ears 2031, which are respectively arranged at the two ends of the housing 201 in the second direction F2, and are also respectively arranged at the two ends of the housing 201 in the third direction F3.

[0125] The pole assemblies 202 of the plurality of battery cells 20 are connected via a busbar 30. Compared with the two pole assemblies 202 respectively arranged at the two ends of the housing 201 in the second direction F2 and at one end of the housing 201 in the third direction F3, in the technical solution of this embodiment, the two pole assemblies 202 are respectively arranged at the two ends of the housing 201 in the second direction F2 and at both ends of the housing 201 in the third direction F3, so that correspondingly, the two busbars 30 respectively connected to the two pole assemblies 202 are also close to different ends of the housing 201 in the third direction F3, so that when the busbar 30 connects the two battery cells 20, both sides of the two battery cells 20 in the third direction F3 have a good fixing effect, and the two busbars 30 have a relatively uniform restraining force on the two battery cells 20, which is conducive to reducing the possibility of relative displacement of the two battery cells 20.

[0126] According to some embodiments of the present invention, reference may be made to Figure 4 The pole assembly 202 and the cavity 2011 are respectively arranged on the side walls of the shell 201 on both sides in the first direction F1.

[0127] In other words, the pole assembly 202 is arranged on the side wall of one side of the shell 201 in the first direction F1, and the cavity 2011 is arranged on the side wall of the other side of the shell 201 in the first direction F1, and the pole assembly 202 and the cavity 2011 are arranged relative to each other in the first direction F1. For a battery cell 20, the pole assembly 202 is not arranged in the cavity 2011.

[0128] Compared with setting the pole assembly 202 on the side wall of the concave cavity 2011, when installing the pole assembly 202, the existence of the circumferential side wall of the concave cavity 2011 will affect the range of motion of the fixing tooling and installation tooling of the pole assembly 202, thereby limiting the size and range of motion of the fixing tooling and the size and range of motion of the installation tooling of the pole assembly 202. The pole assembly 202 and the concave cavity 2011 in this embodiment are respectively arranged on the side walls of the housing 201 on both sides in the first direction F1, so that when installing the pole assembly 202, the housing 201 has less interference with the movement of the fixing tooling and installation tooling of the pole assembly 202, so that it is more convenient to install the pole assembly 202, which is conducive to reducing the difficulty of installing the pole assembly 202.

[0129] According to some embodiments of the present invention, reference may be made to Fig.10 and Fig.11 The battery cell 20 further includes an adapter plate 204 , and both ends of the adapter plate 204 in the third direction F3 are respectively connected to the pole lug 2031 and the pole assembly 202 .

[0130] Exemplarily, the pole assembly 202 and the adapter 204 may be an integrally formed part. Alternatively, exemplary, the pole assembly 202 and the adapter 204 may also be separate molded parts. The adapter 204 may be a single sheet-shaped adapter, or the adapter 204 may also be a conductive structural part with a clamping structure at the end.

[0131] The two end portions of the adapter 204 in the third direction F3 are respectively connected to the pole ear 2031 and the pole assembly 202, which may include: the two end surfaces of the adapter 204 in the third direction F3 are respectively connected to the pole ear 2031 and the pole assembly 202; or, one end of the adapter 204 in the third direction F3 facing the side of the pole assembly 202 in the first direction F1 is connected to the pole assembly 202, and one end of the adapter 204 in the third direction F3 facing the side of the pole ear 2031 in the first direction F1 is connected to the pole ear 2031.

[0132] The pole lug 2031 includes a plurality of pole lug sheets stacked along a first direction F1. The pole lug 2031 is difficult to bend toward a third direction F3 to connect with the pole assembly 202. Therefore, by providing an adapter sheet 204 to connect the pole lug 2031 and the pole assembly 202 whose projections are completely offset in the first direction F1, the difficulty of connecting the pole lug 2031 and the pole assembly 202 can be reduced.

[0133] According to some embodiments of the present invention, reference may be made to Figure 3 The battery cell 20 also includes an insulating member 205, and the insulating member 205 includes a first part 2051 and a second part 2052 arranged in the third direction F3. In the first direction F1, the first part 2051 is at least arranged on the side of the pole ear 2031 facing away from the adapter 204 for insulation between the pole ear 2031 and the shell 201, and the second part 2052 is at least arranged on the side of the adapter 204 facing away from the pole column assembly 202 for insulation between the adapter 204 and the shell 201.

[0134] The first part 2051 and the second part 2052 can be integrally formed, or the first part 2051 and the second part 2052 can be separately formed. A secondary insulating member can be provided on the side of the adapter 204 facing away from the tab 2031 to insulate the side of the adapter 204 facing away from the tab 2031 from the housing 201 .

[0135] The insulating member 205 is provided to achieve insulation between the tab 2031 and the housing 201 and between the adapter 204 and the housing 201 , so as to reduce the possibility of a short circuit in the battery cell 20 and a safety accident.

[0136] According to some embodiments of the present invention, reference may be made to Figure 3 , in the first direction F1, the size of the second portion 2052 is smaller than the size of the first portion 2051.

[0137] Exemplarily, both the first part 2051 and the second part 2052 may be formed with cavities, and reinforcing ribs may be provided in the cavities to reduce the weight of the first part 2051 and the second part 2052. At the same time, both the first part 2051 and the second part 2052 have high structural strength and are not easily deformed, so as to reduce the weight of the battery cell 20. Exemplarily, the first part 2051 may be formed with a groove for accommodating the pole ear 2031. During assembly, the pole ear 2031 is arranged in the groove, and the side wall of the groove surrounds the outer side of the pole ear 2031, so as to achieve a better insulation effect between the pole ear 2031 and the shell 201, and also reduce the number of parts.

[0138] The first part 2051 is used for insulation between the tab 2031 and the housing 201. The first part 2051 is relatively large, which is conducive to better fixing the position of the tab 2031 and reducing the possibility of repeated bending and deformation of the tab 2031. At the same time, the insulation effect between the tab 2031 and the housing 201 is also good. The second part 2052 is used for insulation between the adapter 204 and the housing 201. The second part 2052 is relatively small in the first direction F1, that is, the space occupied by the second part 2052 in the first direction F1 is reduced, so as to make the size of the cavity 2011 in the first direction F1 as large as possible.

[0139] In some embodiments, reference may be made to Fig.10 and 11 The insulating member 205 further includes a third portion 2053, which can be referred to Fig.10 and Fig.11 As shown, the second part 2052 and the third part 2053 are arranged spaced apart in the first direction F1, and the adapter plate 204 is clamped between the second part 2052 and the third part 2053 to achieve insulation between the two sides of the adapter plate 204 in the first direction F1 and the shell 201. Correspondingly, the third part 2053 has an opening area for the pole assembly 202 to pass through, so that the pole assembly 202 can be connected to the adapter plate 204.

[0140] Exemplarily, the third part 2053 may be a plate-shaped member, and the wall surface of the third part 2053 may be provided with reinforcing ribs so that the third part 2053 has better structural strength.

[0141] According to some embodiments of the present invention, the shell 201 includes a shell portion 2013 and a cover body 2012, the shell portion 2013 is formed as an opening 2019 on one side in the first direction F1, the cover body 2012 is covered on the opening 2019, the cover body 2012 is the wall surface with the largest area of ​​the shell 201 (or, the side wall surface of the cover body 2012 on one side in the first direction F1 is the wall surface with the largest area of ​​the shell 201), and the pole assembly 202 is arranged on the cover body 2012.

[0142] The cover 2012 may be provided with one, the shell 2013 is formed with an opening 2019 only on one side in the first direction F1, and the cover 2012 is provided to cover the opening 2019; or, the cover 2012 may be provided with two, the shell 2013 is formed with openings 2019 on both sides in the first direction F1, and the two covers 2012 are respectively provided to cover the openings 2019 on both sides of the shell 2013 in the first direction F1. The cover 2012 may be formed with a concave portion or a convex portion so that the cover 2012 has a better structural strength.

[0143] In the above technical solution, the side wall surface of the cover body 2012 is the wall surface with the largest area of ​​the shell 201. In this way, the processing difficulty of the cover body 2012 and the shell 2013 is small and it is easy to form, which is beneficial to reduce the production cost of the battery cell 20; the pole assembly 202 is arranged on the cover body 2012. In this way, the installation difficulty of the pole assembly 202 is small, and the installation tooling of the pole assembly 202 is not easy to interfere with the shell 201 during operation, and the design of the installation tooling is more flexible.

[0144] According to the second embodiment of the present application, the present embodiment further provides a battery device 100, including a busbar component 30 and a battery cell 20 of any of the above solutions. It is worth noting that the battery device 100 according to the embodiment of the present application may include a box body or may not include a box body.

[0145] A plurality of battery cells 20 are stacked in the first direction F1, so that the pole assembly 202 can be disposed between two battery cells 20 and located in the cavity 2011. In this way, the structure of the battery cell 20 is more compact and occupies less space.

[0146] The busbar component 30 is connected between the pole assemblies 202 of the multiple battery cells 20 to realize the series connection and / or parallel connection of the multiple battery cells 20. For example, when the multiple battery cells 20 are connected in series, the pole assembly 202 of the negative electrode of one battery cell 20 is connected to the pole assembly 202 of the positive electrode of the next battery cell 20 through one busbar component 30, and the pole assembly of the positive electrode of the battery cell 20 is connected to the pole assembly 202 of the negative electrode of the previous battery cell 20 through another busbar component 30. For example, when the multiple battery cells 20 are connected in parallel, the positive electrode assemblies 203 of the two battery cells 20 are connected to each other through the busbar component 30, and the negative electrode assemblies 203 of the two battery cells 20 are connected to each other through the busbar component 30.

[0147] The pole assembly 202 of the battery cell 20 is arranged in the cavity 2011 of the battery cell 20 adjacent thereto, and the cavity 2011 can be used to accommodate at least part of the pole assembly 202. Thus, the pole assembly 202 can share at least part of the space in the second direction F2 with the shell 201 without occupying additional space in the second direction F2, which is beneficial to reducing the space occupied by the battery cell 20 and improving the energy density of the battery device 100.

[0148] Since the battery device 100 of the embodiment of the present application includes the battery cell 20 of any of the above-mentioned schemes, the battery device 100 of the embodiment of the present application has at least the following advantages: by making the projections of the pole lug 2031 and the pole column assembly 202 in the first direction F1 at least partially staggered, the portion of the pole column assembly 202 staggered from the pole lug 2031 corresponds to the cavity 2011 in the first direction F1, and the cavity 2011 is completely staggered from the projection of the pole lug 2031 in the first direction F1, that is, the cavity 2011 only corresponds to the portion of the pole column assembly 202 staggered from the pole lug 2031, and does not correspond to the pole column assembly 202 and the pole lug 2031 at the same time, so that the size of the cavity 2011 in the first direction F1 can be set larger to accommodate a pole column assembly 202 of a larger size, thereby facilitating the increase of the connection area between the pole column assembly 202 and the busbar component 30 and increasing the connection reliability.

[0149] In some embodiments, reference may be made to Figure 7 and Figure 8 , Fig.10 and Fig.11 The conduit component 30 partially extends into the concave cavity 2011 . In the first direction F1 , the portion of the conduit component 30 extending into the concave cavity 2011 is located between the pole assembly 202 and the wall surface of the concave cavity 2011 of the adjacent battery cell 20 .

[0150] That is, the cavity 2011 is used for accommodating at least a portion of the pole assembly 202 and a portion of the busbar component 30 .

[0151] Multiple battery cells 20 are stacked along the first direction F1, and the busbar component 30 extends along the first direction F1. The portion of the busbar component 30 extending into the cavity 2011 is located between the pole assembly 202 and the wall of the cavity 2011 of the adjacent battery cell 20, which is conducive to simplifying the structural complexity of the busbar component 30.

[0152] In the above technical solution, the portion of the busbar component 30 extending into the cavity 2011 can share part of the space with the shell 201 in the second direction, which can reduce the additional space occupied by the busbar component 30 in the second direction, thereby helping to reduce the space occupied by the battery device 100 formed by multiple battery cells, and further helping to improve the energy density of the battery device 100.

[0153] According to some embodiments of the present invention, reference may be made to Figures 7 to 11The confluence component 30 includes a base 302, a first plate 301 and a second plate 303. The first plate 301 and the second plate 303 are arranged opposite to each other in the first direction F1. The base 302 is located on one side of the housing 201 in the second direction F2 and outside the concave cavity 2011. At least part of the first plate 301 and at least part of the second plate 303 are located in the concave cavity 2011. In the second direction F2, one end of the first plate 301 located in the concave cavity 2011 is connected to one end of the second plate 303 located in the concave cavity 2011, and the other end of the first plate 301 and the other end of the second plate 303 are respectively connected to the two bases 302. The base 302 can be connected to the pole assembly 202.

[0154] In the related art, battery cells are connected by a busbar component. When the battery cells move relative to each other, pulling occurs between the busbar component and the pole assembly. Under repeated and long-term pulling, the busbar component is prone to fatigue damage, and the connection position between the pole assembly and the busbar component is prone to damage, which will also affect the connection between the pole assembly and the shell.

[0155] In the embodiment of the present application, the runner component 30 includes a base portion 302, a first plate 301 and a second plate 303. The first plate 301 and the second plate 303 are arranged relative to each other in a first direction F1, so that when the battery cell 20 is displaced along the first direction and the runner component 30 is pulled along the first direction F1, the other end of the first plate 301 and the other end of the second plate 303 can move away from each other, and the first plate 301 and the second plate 303 are deformed, thereby reducing the force at the connection position between the runner component 30 and the pole assembly 202, reducing the degree of fatigue damage of the runner component 30, and improving the reliability of the battery cell 20.

[0156] At least part of the first plate 301 and at least part of the second plate 303 are located in the concave cavity 2011, that is, the first plate 301 and the second plate 303 may be partially located in the concave cavity 2011, or may be completely located in the concave cavity 2011. In this way, the housing 201 may share part of the space with the first plate 301 and the second plate 303 in the first direction F1, which may reduce the extra space occupied by the first plate 301 and the second plate 303 in the second direction F2, thereby facilitating the reduction of the space occupied by the battery device 100 composed of a plurality of battery cells 20, and further facilitating the improvement of the energy density of the battery device 100.

[0157] It should be noted that in the related art, the first plate and the second plate are both arranged outside the cavity. Since in the embodiment of the present application, the projections of the cavity 2011 and the tab 2031 in the first direction F1 are completely staggered, the size of the cavity 2011 in the first direction F1 is larger, so that the cavity 2011 can be used to accommodate at least part of the first plate 301 and the second plate 303, so as to reduce the extra space occupied by the first plate 301 and the second plate 303 in the second direction F2, thereby reducing the space volume of the battery device 100 and improving the energy density of the battery device 100.

[0158] According to some embodiments of the present invention, reference may be made to Fig.10 and Fig.11 The pole assembly 202 includes a first component 2021 and a second component 2022. The first component 2021 passes through the wall of the housing 201 and is used to be electrically connected to the pole ear 2031. The second component 2022 is located outside the housing 201 and protrudes from the first component 2021 in a direction away from the housing 201. The second component 2022 is used to be electrically connected to the current collecting component 30. Specifically, the first component 2021 and the second component 2022 are connected.

[0159] Exemplarily, the second component 2022 may be a block-shaped component, that is, a side surface of the second component 2022 in the first direction as a whole protrudes in a direction away from the housing 201. Alternatively, the second component 2022 includes a first section 2024 and a second section 2025 arranged at a set angle, and one end of the first section 2024 in the first direction F1 may be connected to the middle of the second section 2025 in the second direction F2, or one end of the second section 2025 may also be connected to the end of the first section 2024 in the second direction F2. The set angle may be 90°, 80°, 70°, 60°, etc. The first section 2024 and the second section 2025 may also be connected through the third section 2023, so that the outer side surface of the pole assembly 202 connected to the current collecting component 30 may be located in a suitable position.

[0160] In an embodiment where the second component 2022 includes a first section 2024 and a second section 2025, the size of the pole assembly 202 in the first direction F1 is relatively large, so that the area when the pole assembly 202 is connected to the bus component 30 is large enough, thereby increasing the connection stability between the pole assembly 202 and the bus component 30; the first section 2024 and the second section 2025 are arranged at a set angle, so that the pole assembly 202 is lighter, which is beneficial to improving the energy density of the battery cell 20; at the same time, it is also convenient for the bus component 30 to be welded to the pole assembly 202 along the same direction.

[0161] According to some embodiments of the present invention, reference may be made to Figure 7 and Fig.10As shown, the collector component 30 includes a connected base portion 302 and a protrusion 304, the base portion 302 is located on one side of the shell 201 in the second direction F2 and is located outside the cavity 2011, the protrusion 304 protrudes toward the pole assembly 202 in the second direction F2 and the protrusion 304 is at least partially located in the cavity 2011, and the pole assembly 202 is connected to the protrusion 304.

[0162] That is, the protrusion 304 is located on a side of the base portion 302 close to the shell 201 , and the base portion 302 is located outside the circumferential edge of the shell 201 , so that the base portion 302 is connected between two adjacent protrusions 304 .

[0163] Exemplarily, the protrusion 304 may include two third plates 3041 and a fourth plate 3042 arranged at intervals in the first direction F1, the parts of the two third plates 3041 located in the concave cavity 2011 are interconnected through the fourth plate 3042, the two third plates 3041 are respectively connected to the two base portions 302, and the fourth plate 3042 is connected to the pole assembly; or, the protrusion 304 includes a third plate 3041 and a fourth plate 3042 connected to each other, a third plate 3041 is connected to a base portion, and one end of the third plate 3041 located in the accommodating cavity is connected to the fourth plate 3042.

[0164] In the above technical solution, the protrusion 304 is arranged to be at least partially located in the cavity 2011 to be connected to the pole assembly 202, so that the size of the pole assembly 202 in the second direction F2 does not need to be set too large, for example, there is no need to set the third section 2023, so that the structural strength of the pole assembly 202 is higher and it is not easy to break.

[0165] Exemplarily, in an embodiment where the base portion 302 connected to the protrusion 304 is also connected to the first plate 301 and the second plate 303, the protrusion 304 also has the function of reducing the pulling force of the busbar component 30 on the pole assembly 202 when the battery cell 20 expands or the battery cells 20 move relative to each other.

[0166] According to some embodiments of the present invention, the shell 201 includes a shell portion 2013 and a cover body 2012 that cover each other, the shell portion 2013 includes a first flange 2014, the first flange 2014 and the cover body 2012 are connected to form a flange connecting portion 2020, and an insulating layer 305 is provided at least between the flange connecting portion 2020 and the convergence component 30, and the convergence component 30 is abutted against the flange connecting portion 2020 through the insulating layer 305.

[0167] The provision of the connected first flange 2014 is helpful to increase the connection area between the shell 2013 and the cover 2012 , thereby helping to increase the structural stability and sealing of the shell 201 .

[0168] Exemplarily, the side of the busbar component 30 facing the housing 201 is coated with an insulating coating to form an insulating layer 305 to achieve insulation between the busbar component 30 and the housing 201. Alternatively, the side of the busbar component 30 facing the housing 201 is bonded and fixed with an insulating layer 305 to achieve insulation between the busbar component 30 and the housing 201. Alternatively, the side of the housing 201 facing the busbar component 30 is coated with an insulating coating to form an insulating layer 305 to achieve insulation between the busbar component 30 and the housing 201. Alternatively, the side of the housing 201 facing the busbar component 30 is bonded and fixed with an insulating layer 305 to achieve insulation between the busbar component 30 and the housing 201.

[0169] The provision of the insulating layer 305 can reduce the possibility of direct contact between the busbar component 30 and the shell 201, especially the possibility of direct contact between the flange connection portion 2020 and the shell 201, reduce the possibility of unexpected situations such as short circuit and conduction between the busbar component 30 and the shell 201, and improve the reliability of the battery device 100; the busbar component 30 is abutted against the flange connection portion 2020 through the insulating layer 305; in this way, the space occupied by the busbar component 30 can be minimized, so that the arrangement of the busbar component 30 and the battery cell 20 is more compact, which is beneficial to reducing the volume of the battery device 100 and improving the energy density of the battery device 100.

[0170] like Figure 1 As shown, according to the third aspect embodiment of the present application, the embodiment of the present application further provides an electric device, the electric device includes a battery device 100 of any of the above schemes, and the battery device 100 is used to provide electrical energy to the electric device.

[0171] According to an embodiment of the second aspect of the present invention, an electric device comprises a battery device 100 according to an embodiment of the first aspect of the present invention, and the battery device 100 is used to provide electric energy for the electric device. Thus, by adopting the above-mentioned battery device 100, by making the projections of the pole ear 2031 and the pole column assembly 202 in the first direction F1 at least partially staggered, the portion of the pole column assembly 202 staggered from the pole ear 2031 corresponds to the concave cavity 2011 in the first direction F1, and the concave cavity 2011 is completely staggered from the projection of the pole ear 2031 in the first direction F1, that is, the concave cavity 2011 only corresponds to the portion of the pole column assembly 202 staggered from the pole ear 2031, and does not correspond to the pole column assembly 202 and the pole ear 2031 at the same time. Correspondingly, in this way, the size of the cavity 2011 in the first direction F1 can be set larger to accommodate a larger-sized pole assembly 202, thereby facilitating the increase of the connection area between the pole assembly 202 and the busbar component 30 and increasing the connection reliability; at the same time, the first plate 301 and the second plate 303 of the busbar component 30 can also be arranged in the cavity 2011 to reduce the occupation of the first plate 301 and the second plate 303 on the space outside the shell 201, thereby facilitating the improvement of the energy density of the battery device 100.

[0172] like Fig.12 As shown, according to the third aspect of the embodiment of the present application, the embodiment of the present application further provides an energy storage device, and the energy storage device includes the battery device 100 of any of the above schemes.

[0173] Thus, by adopting the battery device 100, by making the projections of the pole ear 2031 and the pole assembly 202 in the first direction F1 at least partially staggered, the portion of the pole assembly 202 staggered from the pole ear 2031 corresponds to the concave cavity 2011 in the first direction F1, and the concave cavity 2011 and the projections of the pole ear 2031 in the first direction F1 are completely staggered, that is, the concave cavity 2011 only corresponds to the portion of the pole assembly 202 staggered from the pole ear 2031, and does not correspond to the pole assembly 202 and the pole ear 2031 at the same time. Correspondingly, in this way, the size of the cavity 2011 in the first direction F1 can be set larger to accommodate a larger-sized pole assembly 202, thereby facilitating the increase of the connection area between the pole assembly 202 and the busbar component 30 and increasing the connection reliability; at the same time, the first plate 301 and the second plate 303 of the busbar component 30 can also be arranged in the cavity 2011 to reduce the occupation of the first plate 301 and the second plate 303 on the space outside the shell 201, thereby facilitating the improvement of the energy density of the battery device 100.

[0174] The following describes a battery cell 20 , a battery device 100 , and a vehicle 1000 having the same according to some specific embodiments of the present invention with reference to the accompanying drawings.

[0175] In some specific embodiments, reference may be made to Figures 1 to 5 , Figure 8 and Fig.11 As shown, the vehicle 1000 includes a battery device 100 , which includes a busbar component 30 and a plurality of battery cells 20 . The plurality of battery cells 20 are stacked in a first direction F1 , and the busbar component 30 is connected between the pole assemblies 202 of the plurality of battery cells 20 .

[0176] The battery cell 20 is a long-knife structure battery cell, and the battery cell 20 includes a shell 201, a pole assembly 202 and an electrode assembly 203. The shell 201 has two first side walls 2016 opposite to each other in a first direction F1; the pole assembly 202 is arranged on the first side wall 2016; the electrode assembly 203 is arranged in the shell 201, and the electrode assembly 203 includes a pole ear 2031 and an electrode body 2032. The pole ear 2031 is arranged at the end of the electrode body 2032 in the second direction F2, and the pole ear 2031 is connected to the pole assembly 202, wherein,

[0177] A first side wall 2016 has an outer surface formed with a cavity 2011 recessed along a first direction F1, the cavity 2011 is completely offset from a projection of the pole ear 2031 in the first direction F1, the pole ear 2031 is completely offset from a projection of the pole column assembly 202 in the first direction F1 and are connected via a transition piece 204, a portion of the pole column assembly 202 offset from the pole ear 2031 corresponds to the cavity 2011 in the first direction F1, and the first direction F1, the third direction F3 and the second direction F2 intersect each other.

[0178] The shell 201 includes a first edge 2017 and a second edge 2018 spaced apart in a third direction F3. For the connected pole ear 2031 and pole assembly 202, in the third direction F3, the distance between the pole ear 2031 and the first edge 2017 is smaller than the distance between the pole ear 2031 and the second edge 2018, and the distance between the pole assembly 202 and the second edge 2018 is smaller than the distance between the pole assembly 202 and the first edge 2017.

[0179] There are two pole assemblies 202 , which are respectively arranged at two ends of the housing 201 in the second direction F2 and at two ends of the housing 201 in the third direction F3 . The first direction F1 , the third direction F3 and the second direction F2 intersect each other.

[0180] The pole assembly 202 and the concave cavity 2011 are respectively arranged on the side walls of the housing 201 on both sides in the first direction F1. The battery cell 20 also includes an insulating member 205, and the insulating member 205 includes a first part 2051 and a second part 2052 arranged in the third direction F3. In the first direction F1, the first part 2051 is at least arranged on the side of the pole ear 2031 facing away from the adapter 204 for insulation between the pole ear 2031 and the housing 201, and the second part 2052 is at least arranged on the side of the adapter 204 facing away from the pole assembly 202 for insulation between the adapter 204 and the housing 201. In the first direction F1, the size of the second part 2052 is smaller than the size of the first part 2051.

[0181] The shell 201 includes a shell portion 2013 and a cover body 2012. The shell portion 2013 is formed as an opening 2019 on one side in the first direction F1. The cover body 2012 is arranged on the opening 2019. The side wall surface of the cover body 2012 on one side in the first direction F1 is the wall surface with the largest area of ​​the shell 201. The pole assembly 202 is arranged on the cover body 2012.

[0182] The conduit component 30 includes a base portion 302, a first plate 301 and a second plate 303. The first plate 301 and the second plate 303 are arranged opposite to each other in the first direction F1. The base portion 302 is located on one side of the shell 201 in the second direction F2 and outside the concave cavity 2011. At least a portion of the first plate 301 and at least a portion of the second plate 303 are located in the concave cavity 2011. In the second direction F2, one end of the first plate 301 located in the concave cavity 2011 is connected to one end of the second plate 303 located in the concave cavity 2011, and the other end of the first plate 301 and the other end of the second plate 303 are respectively connected to the two base portions 302.

[0183] The pole assembly 202 includes a first component 2021 and a second component 2022. The first component 2021 passes through the wall of the shell 201 and is used to be electrically connected to the pole ear 2031. The second component 2022 is located outside the shell 201 and protrudes from the first component 2021 in a direction away from the shell 201. The second component 2022 is used to be electrically connected to the busbar component 30.

[0184] The shell 2013 includes a first flange 2014 , which is connected to the cover 2012 to form a flange connection portion 2020 . An insulating layer 305 is provided at least between the flange connection portion 2020 and the collector component 30 , and the collector component 30 abuts against the flange connection portion 2020 through the insulating layer 305 .

[0185] In some specific embodiments, reference may be made to Figure 6 and Figure 7 , Fig. 9 and Fig.10The conduit component 30 includes a connected base portion 302 and a protrusion 304, the base portion 302 is located on one side of the shell 201 in the second direction F2 and outside the cavity 2011, the protrusion 304 protrudes toward the pole assembly 202 in the second direction F2 and the protrusion 304 is at least partially located in the cavity 2011, and the pole assembly 202 is connected to the protrusion 304.

[0186] In the above specific embodiment, the positive and negative tabs 2031 are distributed on the diagonal line, the space beside the tabs 2031 is hollowed out, and the corresponding housing 201 is also hollowed out to form a concave cavity 2011, and the first plate 301 and the second plate 303 of the converging component 30 are placed in the hollowed-out position, that is, arranged in the concave cavity 2011. The tabs 2031 and the first plate 301 and the second plate 303 of the converging component 30 are spatially staggered, and the first plate 301 and the second plate 303 of the converging component 30 are arranged in the hollowed-out position, sharing space, reducing space occupancy, and improving the space utilization rate of the battery device 100. The pole assembly 202 has a second component 2022 on the side for welding the convergence component 30, which facilitates welding of the convergence component 30 from the same direction; the pole assembly 202 has a second component 2022 on the side, so that the convergence component 30 adopts a design with a base portion 302, a first plate 301 and a second plate 303 to reduce the processing difficulty of the convergence component 30; the surface of the convergence component 30 facing the shell 201 is insulated, for example, it can be sprayed with insulating paint and an insulating sheet can be attached to avoid contact between the convergence component 30 and the shell.

[0187] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0188] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery device, characterized in that: The invention comprises a busbar component and a plurality of battery cells, wherein the battery cell comprises: a shell having two first side walls opposite to each other in a first direction; a pole assembly, wherein the pole assembly is arranged on the first side wall; an electrode assembly, wherein the electrode assembly is arranged in the shell, wherein the electrode assembly comprises a pole ear and an electrode body, wherein the pole ear is arranged at an end of the electrode body in a second direction, and the pole ear is connected to the pole assembly, wherein a concave cavity recessed along the first direction is formed on an outer surface of at least one of the first side walls, wherein the concave cavity is completely staggered with a projection of the pole ear in the first direction, wherein the pole ear is at least partially staggered with a projection of the pole assembly in the first direction, and a portion of the pole assembly staggered with the pole ear corresponds to the concave cavity in the first direction, and the first direction and the second direction intersect; wherein the thickness direction of the battery cell is the first direction, and the length direction of the battery cell is the second direction; A plurality of battery cells are stacked in the first direction, the current collecting component is connected between the pole assemblies of the plurality of battery cells, and the pole assemblies of the battery cells are arranged in the concave cavities of the battery cells adjacent thereto; The confluence component comprises two base parts, a first plate and a second plate, the first plate and the second plate are arranged opposite to each other in the first direction, the base part is located at one side of the housing in the second direction and outside the concave cavity, and at least a portion of the first plate and at least a portion of the second plate are located in the concave cavity; In the second direction, one end of the first plate member located in the concave cavity is connected to one end of the second plate member located in the concave cavity, and the other end of the first plate member and the other end of the second plate member are respectively connected to the two base parts.

2. The battery device according to claim 1, characterized in that The battery cell further includes a switching plate, the pole lugs and the pole column assemblies are completely staggered in a third direction and connected via the switching plate, and the first direction, the second direction and the third direction intersect each other.

3. The battery device according to claim 1, characterized in that: In the first direction, a size of the cavity is greater than or equal to one half of a size of the housing.

4. The battery device according to claim 1, wherein: The shell includes a first edge and a second edge spaced apart in a third direction. For the connected pole lug and pole column assembly, in the third direction, the distance between the pole lug and the first edge is smaller than the distance between the pole lug and the second edge, and the distance between the pole column assembly and the second edge is smaller than the distance between the pole column assembly and the first edge. The first direction, the second direction and the third direction intersect each other.

5. The battery device according to claim 1, wherein: There are two pole assemblies, which are respectively arranged at two ends of the shell in the second direction and at two ends of the shell in the third direction. The first direction, the second direction and the third direction intersect each other.

6. The battery device according to claim 1, wherein: The pole assembly and the concave cavity are respectively arranged on the side walls of the shell on both sides in the first direction.

7. The battery device according to claim 2, characterized in that: The battery cell also includes an insulating member, which includes a first part and a second part arranged along a third direction. In the first direction, the first part is at least arranged on a side of the pole ear facing away from the adapter plate for insulation between the pole ear and the shell, and the second part is at least arranged on a side of the adapter plate facing away from the pole column assembly for insulation between the adapter plate and the shell. The first direction, the second direction and the third direction intersect each other.

8. The battery device according to claim 7, characterized in that: In the first direction, a size of the second portion is smaller than a size of the first portion.

9. The battery device according to claim 1, characterized in that: The shell comprises a shell portion and a cover body. One side of the shell portion in the first direction is formed as an opening. The cover body is arranged to cover the opening. The cover body is the wall surface with the largest area of ​​the shell. The pole assembly is arranged on the cover body.

10. The battery device according to claim 1, wherein: The pole assembly includes a first component and a second component, the first component passes through the shell wall and is used to be electrically connected to the pole ear, the second component is located outside the shell and protrudes from the first component away from the shell, and the second component is used to be electrically connected to the busbar component.

11. The battery device according to claim 1, wherein: The current collecting component further includes a protrusion, which protrudes toward the pole assembly in the second direction and is at least partially located in the concave cavity, and the pole assembly is connected to the protrusion.

12. The battery device according to any one of claims 1 to 11, characterized in that: The shell includes a shell portion and a cover body covering each other, the shell portion includes a first flange, the first flange and the cover body are connected to form a flange connecting portion, at least an insulating layer is provided between the flange connecting portion and the collector component, and the collector component abuts against the flange connecting portion through the insulating layer.

13. An electrical device, characterized in that: It comprises the battery device as described in any one of claims 1 to 12, wherein the battery device is used to provide electrical energy to the electrical device.

14. An energy storage device, characterized in that: The invention comprises a plurality of battery devices according to any one of claims 1 to 12.

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