Battery cell, battery device, electric device, and energy storage device

Abstract

A battery cell (20), a battery device (100), an electric device, and an energy storage device (2000), relating to the technical field of batteries. The battery cell (20) comprises a casing (201), an electrode assembly (202), and a pole assembly (203); the casing (201) is provided with an accommodating cavity; the electrode assembly (202) is arranged in the accommodating cavity, and the electrode assembly (202) comprises an electrode body (2021) and a conductive member (2023) connected to each other; the pole assembly (203) passes through a mounting hole (2011) of the casing (201); the pole assembly (203) is connected to the electrode body (2021) by means of the conductive member (2023); the pole assembly (203) comprises a first component (2031) and a second component (2032); the first component (2031) and the second component (2032) are connected to form a first welding portion (2033); the conductive member (2023) is partially spaced apart from the pole assembly (203) to form a clearance space; and the first welding portion (2033) is provided at the end of the pole assembly (203) facing the clearance space.

Description

Battery cell, battery device, electric device and energy storage device

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202421966027.1, filed on August 14, 2024, the entire contents of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, in particular to a battery cell, a battery device, an electric device and an energy storage device. BACKGROUND

[0004] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. Among them, the power battery includes a plurality of battery cells. However, the reliability of the battery cell needs to be improved, so that the reliability of the power battery also needs to be improved.

[0005] SUMMARY

[0006] The present application aims to at least solve one of the problems in the prior art. One object of the present application is to provide a battery cell that can improve the reliability of the battery cell.

[0007] In a first aspect, the embodiments of the present application provide a battery cell, comprising: a shell having a receiving cavity; an electrode assembly provided in the receiving cavity, the electrode assembly comprising an electrode body and a conductive member connected together; a pole assembly penetrating a mounting hole of the shell, the pole assembly being connected to the electrode body through the conductive member, the pole assembly comprising a first component and a second component, the first component and the second component being connected to form a first welding portion, the conductive member being spaced apart from the pole assembly to form an avoiding space, and the first welding portion being provided at one end of the pole assembly facing the avoiding space.

[0008] In the technical scheme, the first welding part is arranged at one end of the pole assembly facing the avoiding space, so that the protruding part of the first welding part can be accommodated in the avoiding space. When the conductive part and the pole assembly are connected, the conductive part can be better connected with other parts of the pole assembly without being easily in contact with the first welding part, or in other words, the first welding part does not interfere with the connection between the pole assembly and the conductive part, thereby reducing the influence of the first welding part on the connection reliability between the pole assembly and the conductive part, and avoiding connection defects, improving the welding success rate, and ensuring sufficient effective connection area between the conductive part and the pole assembly, and better consistency of the effective connection area between the conductive part and the pole assembly, thereby improving the charge-discharge performance and use reliability of the battery cell.

[0009] In some embodiments, a side of the pole assembly facing the conductive part includes a first wall surface and a second wall surface, the first wall surface is provided with a first protruding part, and the first protruding part is connected with the conductive part to space the second wall surface from the conductive part to form an avoiding space.

[0010] In the technical scheme, the first protruding part is arranged on the pole assembly, and when the pole assembly is formed, the first protruding part is directly formed, which is convenient to process and low in improvement cost.

[0011] In some embodiments, the second part is arranged in the accommodating cavity, the second part has a through hole, the first part passes through the mounting hole and the through hole, the second part is connected with the hole wall of the through hole to form the first welding part, and the first protruding part is spaced from the first welding part. The first protruding part is arranged on the first part, and / or the first protruding part is arranged on the second part.

[0012] In the technical scheme, for the embodiment in which the first protruding part is arranged on the first part, the connection between the first part and the second part is not easily subjected to a large pulling force, which is beneficial to reduce the possibility of fatigue cracking of the connection between the first part and the second part, and is beneficial to prolong the service life of the battery cell. For the embodiment in which the first protruding part is arranged on the second part, the conductive part can be fixed as much as possible and is not easily separated from the electrode assembly due to tearing, which is beneficial to prolong the service life of the battery cell.

[0013] In some embodiments, the second part is located between the first part and the conductive part, and the first protruding part is arranged on the second part.

[0014] In the technical scheme, the connection area between the first part and the second part is larger and is not easily separated, and the structure stability of the pole assembly is better.

[0015] In some embodiments, the first protrusion is integrally formed with the first component; or, the first protrusion is integrally formed with the second component.

[0016] In the above technical solution, the number of parts can be reduced, the connection process is reduced, the assembly efficiency of the pole assembly is improved, and there is no gap between the pole assembly and the first protrusion, and the flow performance of the pole assembly is better.

[0017] In some embodiments, the conductive member includes a connected tab and a adapter sheet, the tab is connected to the electrode body, the adapter sheet is connected to the pole assembly, a side of the adapter sheet facing the pole assembly includes a third wall surface and a fourth wall surface, the third wall surface is provided with a second protrusion, the second protrusion is connected to the pole assembly, and the fourth wall surface is spaced apart from the pole assembly to form the avoiding space.

[0018] In the above technical solution, the part of the adapter sheet corresponding to the second protrusion has a relatively thick thickness, so the mechanical strength of this part of the adapter sheet is relatively high, the relatively thick thickness can also form a more reliable welding point between the adapter sheet and the pole assembly, reduce welding defects such as virtual welding and cracks, reduce the possibility of fracture or falling off at the connection between the adapter sheet and the pole assembly, and improve the connection stability between the adapter sheet and the pole assembly.

[0019] In some embodiments, the second component is arranged in the accommodating cavity, the second component has a through hole, the first component is arranged through the mounting hole and the through hole, the first component is connected to the through hole through the first welding part, the second protrusion is spaced apart from the first welding part, wherein the second protrusion is connected to the first component; or / and, the second protrusion is connected to the second component.

[0020] In the above technical solution, for the embodiment that the second protrusion is arranged on the adapter sheet and connected to the first component, the connection between the first component and the second component is not easy to be subjected to a large pulling force, which is beneficial to reduce the possibility of fatigue cracking at the connection between the first component and the second component, and is beneficial to prolong the service life of the battery monomer. For the embodiment that the second protrusion is arranged on the adapter sheet and connected to the second component, the adapter sheet can be fixed as much as possible, which is beneficial to improve the installation stability of the adapter sheet, is not easy to separate from the electrode assembly due to tearing, and is beneficial to prolong the service life of the battery monomer.

[0021] In some embodiments, the first component includes an end wall surface facing the adapter sheet, and the second component is connected between the end wall surface of the first component and the second protrusion.

[0022] In the technical solution, the first component and the second component are connected with a larger area and are not easy to separate, and the structure stability of the pole assembly is better.

[0023] In some embodiments, the second protrusion is integrally formed with the adapter plate.

[0024] In the technical solution, the number of parts can be reduced, the connection process is reduced, the assembly efficiency of the pole assembly is improved, and there is no gap between the second protrusion and the adapter plate, and the flow performance of the second protrusion and the adapter plate is better.

[0025] In some embodiments, the adapter plate includes a side wall surface facing away from the pole assembly, and a portion of the side wall surface opposite the second protrusion is formed with a first groove.

[0026] In the technical solution, the conductive part is more convenient to process, has a simpler structure, is lower in processing cost, and is lighter in weight.

[0027] In some embodiments, the conductive part includes a connected tab and an adapter plate, the tab is connected to the electrode body, the adapter plate is connected to the pole assembly, the second component includes a base portion and a convexity protruding from the base portion to the first component, the base portion is used to clamp the wall portion of the shell together with the first component and is connected to the adapter plate, the convexity is connected to the first component and forms the first welding portion, a second groove is formed on a side of the convexity facing the adapter plate, the second groove forms the avoiding space, and the first welding portion is exposed in the second groove.

[0028] In the technical solution, the avoiding space does not occupy the space of the accommodating cavity, but forms the avoiding space by reducing the volume of the pole assembly, so that sufficient space is left for accommodating the electrode assembly, and the formation of the avoiding space has little effect on the arrangement of the electrode assembly.

[0029] In some embodiments, in the through direction of the mounting hole, the size of the avoiding space is 0.2-0.5 mm.

[0030] In the technical solution, on the one hand, the size of the avoiding space is not too small to accommodate the protruding portion of the first welding portion, and on the other hand, the size of the avoiding space is not too large to occupy too much space and affect the arrangement of the electrode assembly.

[0031] In some embodiments, the first component includes a first sub-component and a second sub-component connected to each other, the first sub-component is arranged outside the shell, the second component is arranged in the accommodating cavity, the second sub-component is connected to the second component through the mounting hole, the first sub-component and the second component jointly clamp the wall portion of the shell, an insulation assembly is arranged between the pole column assembly and the shell, the insulation assembly insulates the pole column assembly and the wall portion of the shell, and the conductive piece includes a tab portion and a connecting piece connected to each other, the tab portion is connected to the electrode body, and the connecting piece is connected to the pole column assembly.

[0032] In the technical solution, the first sub-component and the second component jointly clamp the wall portion of the shell, the first sub-component and the second component can play a limiting role, which is conducive to stably fixing the pole column assembly on the shell, the insulation assembly can reduce the possibility of electrical conduction between the pole column assembly and the shell, and the insulation assembly can also play a role in sealing the gap between the pole column assembly and the shell, thereby reducing the possibility of water or impurities entering the battery monomer, and improving the use reliability of the battery monomer.

[0033] In a second aspect, the embodiments of the present application further provide a battery device including the battery monomer of any of the above-mentioned solutions.

[0034] In the technical solution, the reliability of the battery monomer according to the embodiments of the present application is improved, thereby improving the performance of the battery device.

[0035] In a third aspect, the embodiments of the present application further provide a power utilization device including the battery device of any of the above-mentioned solutions.

[0036] In the technical solution, the performance of the battery device is improved, thereby improving the working power utilization performance of the power utilization device.

[0037] In a fourth aspect, the embodiments of the present application further provide an energy storage device including the battery device of any of the above-mentioned solutions.

[0038] In the technical solution, the performance of the battery device is improved, thereby improving the working power utilization performance of the energy storage device. BRIEF DESCRIPTION OF DRAWINGS

[0039] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0040] FIG. 2 is an exploded view of a battery device according to some embodiments of the present application;

[0041] FIG. 3 is an exploded view of a battery monomer according to some embodiments of the present application;

[0042] FIG. 4 is a top view of a battery monomer according to some embodiments of the present application;

[0043] Fig. 5 is a sectional view taken along line A-A in Fig. 4;

[0044] Fig. 6 is an enlarged view of a portion B in Fig. 5;

[0045] Fig. 7 is a plan view of a battery cell according to another embodiment of the present application;

[0046] Fig. 8 is a sectional view taken along line C-C in Fig. 7;

[0047] Fig. 9 is an enlarged view of a portion D in Fig. 8;

[0048] Fig. 10 is a partial sectional view of a battery cell according to further embodiments of the present application;

[0049] Fig. 11 is a partial sectional view of a battery cell according to still further embodiments of the present application;

[0050] Fig. 12 is a partial sectional view of a battery cell according to yet further embodiments of the present application;

[0051] Fig. 13 is a partial sectional view of a battery cell according to still yet further embodiments of the present application;

[0052] Fig. 14 is a partial sectional view of a battery cell according to yet still further embodiments of the present application;

[0053] Fig. 15 is a schematic structural view of an energy storage device according to some embodiments of the present application.

[0054] Reference Signs:

[0055] Vehicle 1000;

[0056] Battery device 100; controller 200; motor 300; energy storage device 2000;

[0057] Case 10;

[0058] First case 101; second case 102;

[0059] Battery cell 20;

[0060] Housing 201;

[0061] Mounting hole 2011; first groove 2012; housing body 2013; housing cover 2014;

[0062] Electrode assembly 202;

[0063] Electrode body 2021; adapter tab 2022; conductive member 2023; tab portion 2024;

[0064] Fourth wall surface 2025; first recess 2026; side wall surface 2027; third wall surface 2028;

[0065] pole assembly 203;

[0066] first component 2031; first sub-portion 20311; second sub-portion 20312; second component 2032;

[0067] first welding portion 2033; first protrusion 2034; second protrusion 2035; second wall surface 2036;

[0068] base portion 2037; convex bump 2038; through hole 2039; second groove 2040; end wall surface 2041;

[0069] first wall surface 2101;

[0070] avoidance space 204; second welding portion 205;

[0071] insulation assembly 206;

[0072] first insulation member 2061; sealing member 2062; second insulation member 2063; first limiting portion 2064;

[0073] second limiting portion 2065. DETAILED DESCRIPTION

[0074] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0075] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover the non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0076] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments.

[0077] In the description of the present application, it should be noted that unless specifically stated and limited otherwise, the terms "mounting", "connected", "connection", "attach" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0078] In the present application, the term "and / or" is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0079] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0080] In the present application, "multiple" refers to more than two (including two).

[0081] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel or mixed connection through a busbar component.

[0082] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0083] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0084] In some embodiments, the battery apparatus can be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0085] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the case by securing the battery module in the case.

[0086] As an example, the battery cell assembly can also be housed in the case by securing a plurality of battery cells directly in the case.

[0087] As an example, the case can include a first case and a second case. The first case and the second case are coupled such that an enclosed space is formed inside the case to receive the battery cell assembly. Enclosed here means covered or closed, which can be sealed or unsealed. The first case can be a top cover or a bottom plate.

[0088] As an example, the case can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame such that an enclosed space is formed inside the case to receive the battery cell assembly.

[0089] In some embodiments, the case can be part of a chassis structure of a vehicle. For example, part of the case can be at least part of a floor of the vehicle, or part of the case can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0090] Embodiments of the present application provide an energy storage device including one or more battery clusters to improve the voltage and capacity of the energy storage device. The battery cluster can include a plurality of battery devices connected in series by a busbar to improve the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the energy storage device.

[0091] In the present application, the battery cell can include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, or a solid-state battery, etc. Embodiments of the present application are not limited thereto. The battery cell can be in the shape of a cylinder, a cuboid, or other shapes, etc. Embodiments of the present application are not limited thereto.

[0092] The battery referred to in embodiments of the present application means a single physical module including one or more battery cells to provide higher voltage and capacity. As an example, the battery can include a case for packaging one or more battery cells, or one or more battery modules, and the case can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cell.

[0093] The battery cell includes a housing component, an electrode component, and an electrolyte (in a solid-state battery, it can be a solid-state electrolyte layer located between the positive and negative electrode sheets), the electrode component includes at least one electrode assembly, the electrode assembly and the electrolyte are both accommodated in the housing component, the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator film (which can be omitted in a solid-state battery). The battery cell mainly relies on the movement of metal ions between the positive and negative electrode sheets to work.

[0094] The positive electrode sheet includes a positive current collector and a positive active material layer, the positive active material layer is coated on the surface of the positive current collector, the positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer, and the positive current collector without the positive active material layer serves as a positive tab sheet. Taking a lithium ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc.

[0095] The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer is coated on the surface of the negative current collector, the negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer, and the negative current collector without the negative active material layer serves as a negative tab sheet. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. The material of the separator film can be PP, polypropylene, or PE, polyethylene, etc. The electrode assembly mentioned in the embodiments of the present application is a winding or stacking structure.

[0096] The electrode assembly can be a winding structure or a stacking structure. During processing, the positive electrode sheet, the negative electrode sheet, and the separator film are wound or stacked in sequence to obtain the electrode assembly. In the electrode assembly, a plurality of positive tab sheets are stacked together and electrically connected to the positive pole assembly, and a plurality of negative tab sheets are stacked together and electrically connected to the negative pole assembly.

[0097] Some battery cells in the related art include a housing and a pole assembly provided on the housing, the pole assembly is used to connect an electrode assembly located inside the housing and an external device located outside the housing, the electrode assembly includes a conductive member and an electrode body, and the pole assembly is connected to the electrode body through the conductive member.

[0098] In order to increase the connection convenience between the pole assembly and the external circuit and between the pole assembly and the electrode assembly, one end of the pole assembly is usually located inside the housing, and the other end is located outside the housing. In order to increase the installation stability of the pole assembly and reduce the installation difficulty of the pole assembly, the pole assembly usually includes a first component and a second component which are separate from each other. During assembly, at least one of the first component and the second component is inserted into the mounting hole of the housing, and then the first component and the second component are connected, so that the pole assembly can be fixed to the housing.

[0099] However, after the first component and the second component are connected by welding or the like, a protruding portion is formed at the connection between the first component and the second component, for example, at the welding portion, and the protruding portion protrudes from the wall surface of the pole assembly for connecting the conductive member. The presence of the protruding portion causes the wall surface of the conductive member to not be well fitted to the pole assembly, so that when the conductive member and the pole assembly are connected, there is a problem of connection defects, for example, when the conductive member and the pole assembly are welded, there is a problem of welding defects, which affects the effective connection area between the conductive member and the pole assembly, and further affects the charge and discharge performance of the battery monomer, so that the use reliability of the battery monomer is reduced.

[0100] In view of this, the embodiments of the present application provide a battery monomer, which comprises a shell, an electrode assembly and a pole assembly. The shell has a receiving cavity. The electrode assembly is arranged in the receiving cavity and comprises an electrode body. The pole assembly is arranged in a mounting hole of the shell and is connected to the electrode body through a conductive member. The pole assembly comprises a first component and a second component. The first component and the second component are connected to form a first welding portion. The conductive member and the pole assembly are partially spaced apart to form an avoiding space. The first welding portion is arranged at one end of the pole assembly facing the avoiding space.

[0101] In the battery monomer with the above structure, by partially spacing apart the conductive member and the pole assembly to form an avoiding space, and arranging the first welding portion at one end of the pole assembly facing the avoiding space, the protruding portion of the first welding portion can be accommodated in the avoiding space. When the conductive member and the pole assembly are connected, the conductive member can be better connected to other parts of the pole assembly without being easily in contact with the first welding portion, or in other words, the first welding portion does not interfere with the conductive member. Therefore, the influence of the first welding portion on the connection reliability between the pole assembly and the conductive member can be reduced. When the conductive member and the pole assembly are connected, connection defects are less likely to occur, which is conducive to improving the welding success rate, conducive to making the conductive member and the pole assembly have sufficient effective connection area, and the consistency of the effective connection area between the conductive member and the pole assembly is better, which further improves the charge and discharge performance and use reliability of the battery monomer.

[0102] The technical solutions described in the embodiments of the present application are suitable for battery monomers, battery devices containing battery monomers, and electric devices and energy storage devices using battery devices.

[0103] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The electric device is not specially limited in the embodiments of the present application.

[0104] The energy storage device can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electric energy as needed and output the electric energy at an appropriate time. For example, the energy storage device can store electric energy at a low electricity consumption valley, and provide electric energy for related users or electric equipment at a high electricity consumption peak. The energy storage system provided in the embodiments of the present application can be any power system that needs to use an energy storage device.

[0105] The following embodiments take the vehicle as an example for convenience of description.

[0106] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery device 100, which can be arranged at a bottom, a head, or a tail of the vehicle 1000, etc. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power supply of the vehicle 1000.

[0107] The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0108] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0109] Please refer to FIG. 15, which is a structural schematic diagram of an energy storage device 2000 provided by some embodiments of the present application, the energy storage device 2000 being provided with a battery device 100. In some embodiments, the energy storage device can be an energy storage container or an energy storage cabinet. In some embodiments, the energy storage device can include a cabinet body and one or more battery clusters, the battery clusters being accommodated in the cabinet body, and the battery clusters can include a plurality of battery devices.

[0110] Please refer to FIG. 2, which is an exploded view of the battery device 100 provided by some embodiments of the present application, the battery device 100 including a battery monomer 20 and a box 10 for accommodating the battery monomer 20. The box 10 can be in various structural forms.

[0111] In some embodiments, the box 10 can include a first box 101 and a second box 102, the first box 101 and the second box 102 being mutually coverable, and the first box 101 and the second box 102 jointly defining an accommodation space for accommodating the battery monomer 20. The connection position of the first box 101 and the second box 102 can also be provided with a sealing member 2062 to achieve the sealed connection of the first box 101 and the second box 102. For example, referring to FIG. 2, the first box 101 and the second box 102 can each be a hollow structure with one side open, the open side of the first box 101 being coverable on the open side of the second box 102, thereby forming the box 10 with the accommodation space. For another example, the second box 102 can be a hollow structure with one side open, and the first box 101 can be in the form of a cover and coverable on the open side of the second box 102. The box 10 can be in various shapes, such as a cylindrical box, a cuboid box, etc.

[0112] Please refer to FIGS. 3-14, FIG. 3 is an exploded view of the battery monomer 20 provided by some embodiments of the present application; FIG. 4 is a top view of the battery monomer 20 provided by some embodiments of the present application; FIG. 5 is a cross-sectional view of A-A in FIG. 4; FIG. 6 is a partial enlarged view of part B in FIG. 5; FIG. 7 is a top view of the battery monomer 20 provided by another some embodiments of the present application; FIG. 8 is a cross-sectional view of C-C in FIG. 7; FIG. 9 is a partial enlarged view of part D in FIG. 8; FIG. 10 is a partial cross-sectional view of the battery monomer 20 provided by still some embodiments of the present application; FIG. 11 is a partial cross-sectional view of the battery monomer 20 provided by yet some embodiments of the present application; FIG. 12 is a partial cross-sectional view of the battery monomer 20 provided by again some embodiments of the present application; FIG. 13 is a partial cross-sectional view of the battery monomer 20 provided by still again some embodiments of the present application; and FIG. 14 is a partial cross-sectional view of the battery monomer 20 provided by yet again some embodiments of the present application.

[0113] In combination with FIGS. 3-13, the battery monomer 20 can include a shell 201, an electrode assembly 202, and a pole assembly 203.

[0114] With reference to Figs. 3-13, the shell 201 has a receiving cavity; the electrode assembly 202 is arranged in the receiving cavity, and the electrode assembly 202 includes an electrode body 2021 and a conductive member 2023; the post assembly 203 is arranged through a mounting hole 2011 of the shell 201, the post assembly 203 is connected with the electrode body 2021 through the conductive member 2023, the post assembly 203 includes a first part 2031 and a second part 2032, the first part 2031 and the second part 2032 are connected to form a first welding portion 2033, the conductive member 2023 is spaced apart from the post assembly 203 to form an avoiding space 204, and the first welding portion 2033 is arranged at an end of the post assembly 203 facing the avoiding space 204.

[0115] For example, with reference to Fig. 3, the shell 201 includes a shell body 2013 and a shell cover 2014, the shell cover 2014 is arranged on a side of the shell body 2013 which is open, and the shell cover 2014 and the shell body 2013 jointly define the receiving cavity, and the shell cover 2014 has the mounting hole 2011 for mounting the post assembly 203.

[0116] For example, the post assembly 203 is arranged through the mounting hole 2011 of the shell 201, and in a direction perpendicular to the penetrating direction of the mounting hole 2011, the size of an end of the post assembly 203 located in the shell 201 and the size of an end of the post assembly 203 located outside the shell 201 are both greater than the size of the mounting hole 2011, so that the post assembly 203 and the shell 201 can form a limiting action, and the position of the post assembly 203 is fixed. At the same time, it is also beneficial to increase the connection area of the post assembly 203 which can be used to connect with the conductive member 2023.

[0117] The electrode assembly 202 includes the electrode body 2021 and the conductive member 2023, and the conductive member 2023 can only include the tab portion 2024, that is, the tab portion 2024 can be directly connected with the post assembly 203 to form a second welding portion 205 (wherein a plurality of tab sheets are laminated to form the tab portion 2024). Alternatively, the conductive member 2023 includes the tab portion 2024 and the adapter sheet 2022 which are connected, the tab portion 2024 is connected with the electrode body 2021, and the adapter sheet 2022 is connected with the post assembly 203 to form the second welding portion 205.

[0118] For example, the conductive member 2023 and the post assembly 203 can be directly connected through welding (such as laser welding, resistance welding, pressure fusion welding, or brazing, etc.). For example, the adapter sheet 2022 and the tab portion 2024 can be directly connected through welding (such as laser welding, resistance welding, pressure fusion welding, or brazing, etc.).

[0119] The first component 2031 and the second component 2032 are connected to form a first welding portion 2033, that is, the first component 2031 and the second component 2032 are connected in a welding manner, on one hand, the first component 2031 and the second component 2032 have good connection stability, and the first component 2031 and the second component 2032 are not prone to loosening, on the other hand, the current conduction performance of the first component 2031 and the second component 2032 can be better.

[0120] The lug portion 2024 is directly connected with the pole assembly 203, so that the battery monomer 20 has few components, compact structure and small size.

[0121] In the battery monomer 20 of some embodiments, the lug portion 2024 and the pole assembly 203 are connected through the adapter plate 2022, so that the length of the lug portion 2024 can be shortened, the problems of wrinkling, bending and breaking of the lug portion 2024 can be improved, the shape and material of the adapter plate 2022 can be flexibly designed, the connection difficulty of the adapter plate 2022 and the pole assembly 203 can be reduced, and the connection convenience of the adapter plate 2022 and the pole assembly 203 can be improved.

[0122] Along the penetrating direction of the mounting hole 2011, the first component 2031 is at least partially located outside the second component 2032, and the first component 2031 is used for being connected with an external device. In the embodiment in which the conductive part 2023 is connected with the first component 2031, the first component 2031 is a conductor, and the second component 2032 can be a conductor or an insulator. In the embodiment in which the conductive part 2023 is connected with the second component 2032, the first component 2031 and the second component 2032 are both conductors.

[0123] The first component 2031 can be an integral part, or the first component 2031 can also be formed by a plurality of first sub-components connected with each other; the second component 2032 can be an integral part, or the second component 2032 can also be formed by a plurality of second sub-components connected with each other.

[0124] The first component 2031 and the second component 2032 are connected to form a first welding portion 2033, for example, the first component 2031 and the second component 2032 can be welded, and the first welding portion formed by welding of the first component 2031 and the second component 2032 is the first welding portion 2033. Due to the limitation of welding technology or other reasons, the first welding portion 2033 can have a protruding portion protruding from the side of the pole assembly 203 used for being connected with the conductive part 2023.

[0125] According to the battery cell 20 provided by the embodiment of the present application, the conductive piece 2023 and the pole assembly 203 are partially spaced apart to form the avoiding space 204, the first welding part 2033 is arranged at one end of the pole assembly 203 which is towards the avoiding space 204, so that the protruding part of the first welding part 2033 can be accommodated in the avoiding space 204, and when the conductive piece 2023 and the pole assembly 203 are connected, the conductive piece 2023 can be better connected with other parts of the pole assembly 203 without being easily contacted with the first welding part 2033, or in other words, the first welding part 2033 will not interfere with the connection between the pole assembly 203 and the conductive piece 2023, so that the influence of the first welding part 2033 on the connection reliability between the pole assembly 203 and the conductive piece 2023 can be reduced, and when the conductive piece 2023 and the pole assembly 203 are connected, the connection defect problem is not easy to occur, which is beneficial to improve the welding success rate and beneficial to make the conductive piece 2023 and the pole assembly 203 have sufficient effective connection area, and the consistency of the effective connection area between the conductive piece 2023 and the pole assembly 203 is better, and then the charge and discharge performance and the use reliability of the battery cell 20 can be improved.

[0126] According to some embodiments of the present application, as shown in FIGS. 4-9, the side of the pole assembly 203 which is towards the conductive piece 2023 comprises a first wall surface 2101 and a second wall surface 2036, the first wall surface 2101 is provided with a first protruding part 2034, the first protruding part 2034 is connected with the conductive piece 2023 to make the second wall surface 2036 spaced apart from the conductive piece 2023 to form the avoiding space 204.

[0127] For example, one end of the first protruding part 2034 is connected with the pole assembly 203, and the other end of the first protruding part 2034 is connected with the conductive piece 2023; wherein along the penetrating direction of the mounting hole 2011, the size of the first protruding part 2034 in the direction perpendicular to the penetrating direction of the mounting hole 2011 can be equal everywhere; or in the direction perpendicular to the penetrating direction of the mounting hole 2011, the size of one end of the first protruding part 2034 can be greater than the size of the other end of the first protruding part 2034; or in the direction perpendicular to the penetrating direction of the mounting hole 2011, the size of one end of the first protruding part 2034 can be smaller than the size of the other end of the first protruding part 2034. The surface of the first protruding part 2034 which is connected with the conductive piece 2023 is a plane so that the first protruding part 2034 and the conductive piece 2023 can better fit and the effective connection area is larger.

[0128] The first protruding part 2034 can be integrally formed with the pole assembly 203, or the first protruding part 2034 and the pole assembly 203 can be separately formed and then connected with each other. For example, the first protruding part 2034 is connected with the pole assembly 203 and then connected with the conductive piece 2023.

[0129] In the technical solution, the first protrusion 2034 is arranged on the pole assembly 203 and connected with the conductive part 2023, so that the conductive part 2023 can be spaced apart from the pole assembly 203 to form the avoiding space 204, so that the conductive part 2023 will not be in contact with the first welding part 2033, which is conducive to reducing the possibility that the first welding part 2033 affects the effective connection area between the conductive part 2023 and the pole assembly 203. At the same time, the first protrusion 2034 is arranged on the pole assembly 203, and when the pole assembly 203 is formed, the first protrusion 2034 can be directly formed, which is convenient for processing and low in improvement cost.

[0130] According to some embodiments of the present application, as shown in FIG. 6, the second part 2032 is arranged in the accommodating cavity, the second part 2032 has a through hole 2039, the first part 2031 is arranged through the mounting hole 2011 and the through hole 2039, the first part 2031 is connected with the hole wall of the through hole 2039 to form the first welding part 2033, the first protrusion 2034 is spaced apart from the first welding part 2033, and the first protrusion 2034 is arranged on the first part 2031.

[0131] According to some embodiments of the present application, as shown in FIG. 9, the second part 2032 is arranged in the accommodating cavity, the second part 2032 has a through hole 2039, the first part 2031 is arranged through the mounting hole 2011 and the through hole 2039, the first part 2031 is connected with the hole wall of the through hole 2039 to form the first welding part 2033, the first protrusion 2034 is spaced apart from the first welding part 2033, and the first protrusion 2034 is arranged on the second part 2032.

[0132] According to some embodiments of the present application, the second part 2032 is arranged in the accommodating cavity, the second part 2032 has a through hole 2039, the first part 2031 is arranged through the mounting hole 2011 and the through hole 2039, the first part 2031 is connected with the hole wall of the through hole 2039 to form the first welding part 2033, and the first part 2031 and the second part 2032 are both provided with the first protrusion 2034, and the first protrusion 2034 is spaced apart from the first welding part 2033.

[0133] As shown in FIGS. 4 to 6, for the embodiment in which the first protrusion 2034 is arranged on the first part 2031, when the electrode body 2021 applies a pulling force to the conductive part 2023, the pulling force can be directly transmitted to the first part 2031, so that the first part 2031 can directly transmit the force to the shell 201, and thus the connection between the first part 2031 and the second part 2032 is not easy to be affected by a large pulling force, which is conducive to reducing the possibility that the connection between the first part 2031 and the second part 2032 is cracked due to fatigue, and is conducive to prolonging the service life of the battery monomer 20.

[0134] Referring to FIGS. 7-9, for the embodiment in which the first protrusion 2034 is arranged on the second component 2032, the connecting region of the conductive member 2023 and the first protrusion 2034 surrounds the first component 2031, so that the conductive member 2023 can be fixed as much as possible, for example, the position of the part of the conductive member 2023 connected with the first protrusion 2034 and the part of the conductive member 2023 corresponding to the first component 2031 can be fixed better, which is beneficial to improve the installation stability of the conductive member 2023, and the conductive member 2023 is not easy to separate from the electrode assembly 202 due to tearing, which is beneficial to prolong the service life of the battery monomer 20.

[0135] For the embodiment in which the first protrusion 2034 is arranged on both the second component 2032 and the first component 2031, the conductive member 2023 can be connected with both the first component 2031 and the second component 2032, so that the effective connection area of the conductive member 2023 and the electrode post assembly 203 is larger, the overcurrent performance is better, and the charge-discharge performance of the battery monomer 20 is better, which improves the use reliability of the battery monomer 20.

[0136] According to some embodiments of the present application, the second component 2032 is located between the first component 2031 and the conductive member 2023, and the first protrusion 2034 is arranged on the second component 2032.

[0137] For example, along the penetrating direction of the mounting hole 2011, the first component 2031 is arranged in the mounting hole 2011, the second component 2032 is completely located in the accommodating cavity, the second component 2032 is connected with the end surface of the first component 2031 facing the accommodating cavity, and the first protrusion 2034 is arranged on the side surface of the second component 2032 away from the first component 2031. Alternatively, along the penetrating direction of the mounting hole 2011, the first component 2031 is located on the side of the second component 2032 away from the accommodating cavity, the second component 2032 is partially arranged in the mounting hole 2011 and partially located in the accommodating cavity, the second component 2032 is connected with the end surface of the first component 2031 facing the accommodating cavity, and the first protrusion 2034 is arranged on the side surface of the second component 2032 away from the first component 2031.

[0138] At this time, the first component 2031 and the second component 2032 can be connected in a way of penetrating welding, the first welding part 2033 is formed at an end of the second component 2032 away from the first component 2031, the conductive part 2023 is connected with the first protruding part 2034, so that the conductive part 2023 can be spaced apart from the second component 2032 to form an avoiding space 204, the avoiding space 204 can accommodate part of the first welding part 2033, so that the conductive part 2023 can be spaced apart from the first welding part 2033 in a direction perpendicular to the penetrating direction of the mounting hole 2011, and the conductive part 2023 will not interfere with the first welding part 2033. The second component 2032 is connected with the end surface of the first component 2031 facing the accommodating cavity, so that the connection area between the first component 2031 and the second component 2032 is larger, and the first component 2031 and the second component 2032 are not easy to separate, and the structural stability of the pole assembly 203 is better.

[0139] According to some embodiments of the present application, referring again to FIGS. 3-9, the first protruding part 2034 and the first component 2031 are integrally formed; or, the first protruding part 2034 and the second component 2032 are integrally formed.

[0140] The first protruding part 2034 is integrally formed with the pole assembly 203, that is, the first protruding part 2034 and the pole assembly 203 are an integral piece, so that the number of parts can be reduced, the connection process is reduced, the assembly efficiency of the pole assembly 203 is improved, and there is no gap between the pole assembly 203 and the first protruding part 2034, and the flow performance of the pole assembly 203 is better.

[0141] According to some embodiments of the present application, referring to FIGS. 10 and 11, the conductive part 2023 includes a connected tab part 2024 and a adapter sheet 2022, the tab part 2024 is connected with the electrode body 2021, the adapter sheet 2022 is connected with the pole assembly 203, the side surface of the adapter sheet 2022 facing the pole assembly 203 includes a third wall surface 2028 and a fourth wall surface 2025, the third wall surface 2028 is provided with a second protruding part 2035, the second protruding part 2035 is connected with the pole assembly 203, so that the fourth wall surface 2025 is spaced apart from the pole assembly 203 to form an avoiding space 204.

[0142] Exemplarily, one end of the second protrusion 2035 is connected with the pole assembly 203, and the other end of the second protrusion 2035 is connected with the adapter plate 2022; wherein, along the penetrating direction of the mounting hole 2011, the size of the second protrusion 2035 in the direction perpendicular to the penetrating direction of the mounting hole 2011 can be equal everywhere; or, in the direction perpendicular to the penetrating direction of the mounting hole 2011, the size of one end of the second protrusion 2035 can be greater than the size of the other end of the second protrusion 2035; or, in the direction perpendicular to the penetrating direction of the mounting hole 2011, the size of one end of the second protrusion 2035 can be smaller than the size of the other end of the second protrusion 2035. The surface of the second protrusion 2035 connected with the pole assembly 203 is a plane so that the second protrusion 2035 and the pole assembly 203 can better fit, and the effective connection area is larger.

[0143] The second protrusion 2035 can be integrally formed with the adapter plate 2022, or the second protrusion 2035 and the adapter plate 2022 can be separately formed and then connected with each other. For example, the second protrusion 2035 is connected with the adapter plate 2022, and then connected with the pole assembly 203.

[0144] In the above technical solution, the second protrusion 2035 is arranged on the adapter plate 2022 to be connected with the pole assembly 203, so that the adapter plate 2022 and the first welding portion 2033 can be spaced apart, and the adapter plate 2022 is not easy to contact and interfere with the first welding portion 2033, thus, it is beneficial to reduce the possibility that the first welding portion 2033 affects the effective connection area between the adapter plate 2022 and the pole assembly 203.

[0145] Meanwhile, the second protrusion 2035 is arranged on the adapter plate 2022, that is, the thickness of the part of the adapter plate 2022 corresponding to the second protrusion 2035 is relatively thick, so the mechanical strength of this part of the adapter plate 2022 is higher, the tensile strength and shear resistance are better, and when welding, the relatively thick thickness can also make the adapter plate 2022 and the pole assembly 203 form a more reliable welding point, reduce welding defects such as virtual welding, cracks, etc., reduce the possibility of fracture or falling off at the connection between the adapter plate 2022 and the pole assembly 203, and improve the connection stability between the adapter plate 2022 and the pole assembly 203.

[0146] According to some embodiments of the present application, referring to FIG. 10, the second component 2032 is arranged in the accommodating cavity, the second component 2032 has a through hole 2039, the first component 2031 is arranged through the mounting hole 2011 and the through hole 2039, the first component 2031 is connected with the hole wall of the through hole 2039 to form the first welding portion 2033, the second protrusion 2035 is spaced apart from the first welding portion 2033, and the second protrusion 2035 is connected with the first component 2031.

[0147] According to some embodiments of the present application, referring to FIG. 11, the second component 2032 is arranged in the accommodating cavity, the second component 2032 has a through hole 2039, the first component 2031 is arranged through the mounting hole 2011 and the through hole 2039, the first component 2031 is connected with the hole wall of the through hole 2039 to form a first welding portion 2033, the second protruding portion 2035 is spaced apart from the first welding portion 2033, and the second protruding portion 2035 is connected with the second component 2032.

[0148] According to some embodiments of the present application, referring to FIG. 11, the second component 2032 is arranged in the accommodating cavity, the second component 2032 has a through hole 2039, the first component 2031 is arranged through the mounting hole 2011 and the through hole 2039, the first component 2031 is connected with the hole wall of the through hole 2039 to form a first welding portion 2033, the second protruding portion 2035 is spaced apart from the first welding portion 2033, and the second protruding portion 2035 is connected with the second component 2032.

[0149] Referring to FIG. 10, for the embodiment in which the second protruding portion 2035 is arranged on the adapter piece 2022 and connected with the first component 2031, when the electrode body 2021 exerts a pulling force on the adapter piece 2022, the pulling force can be directly transmitted to the first component 2031, so that the first component 2031 can directly transmit the force to the shell 201, thereby making the connection between the first component 2031 and the second component 2032 not easy to be subjected to a larger pulling force, which is beneficial to reduce the possibility of fatigue cracking at the connection between the first component 2031 and the second component 2032, and is beneficial to prolong the service life of the battery monomer 20.

[0150] Referring to FIG. 11, for the embodiment in which the second protruding portion 2035 is arranged on the conductive member 2023 and connected with the second component 2032, that is, the connection area between the adapter piece 2022 and the second protruding portion 2035 surrounds the first component 2031, so that the adapter piece 2022 can be fixed as much as possible, for example, the positions of the part connected with the second protruding portion 2035 of the pole group assembly 203 and the part corresponding to the first component 2031 of the adapter piece 2022 can be fixed better, which is beneficial to improve the installation stability of the adapter piece 2022, and is not easy to be separated from the electrode assembly 202 due to tearing, which is beneficial to prolong the service life of the battery monomer 20.

[0151] For the embodiment in which the second protruding portion 2035 is connected with both the first component 2031 and the second component 2032, in this way, the effective connection area between the adapter piece 2022 and the pole group assembly 203 is larger, and the overcurrent performance is better, thereby making the charge-discharge performance of the battery monomer 20 better, and improving the use reliability of the battery monomer 20.

[0152] According to some embodiments of the present application, as shown in FIG. 14, the first component 2031 includes an end wall surface 2041 facing the adapter plate 2022, and the second component 2032 is connected between the end wall surface 2041 of the first component 2031 and the second protrusion 2035.

[0153] For example, along the penetrating direction of the mounting hole 2011, the first component 2031 is arranged in the mounting hole 2011, the second component 2032 is completely arranged in the accommodating cavity, and the second component 2032 is connected to the end wall surface 2041 of the first component 2031 facing the adapter plate 2022. Alternatively, along the penetrating direction of the mounting hole 2011, the first component 2031 is arranged on the side of the second component 2032 away from the adapter plate 2022, the second component 2032 is partially arranged in the mounting hole 2011 and partially arranged in the accommodating cavity, and the second component 2032 is connected to the end wall surface 2041 of the first component 2031 facing the adapter plate 2022.

[0154] At this time, the first component 2031 and the second component 2032 can be connected by penetration welding, the first welding portion 2033 is formed at one end of the second component 2032 facing the adapter plate 2022, the pole assembly 203 is connected to the second protrusion 2035, so that the adapter plate 2022 can be partially spaced apart from the second component 2032 to form an avoiding space 204, the avoiding space 204 can accommodate part of the first welding portion 2033, so that the conductive member 2023 can be spaced apart from the first welding portion 2033 and will not interfere with the first welding portion 2033. The second component 2032 is connected to the end wall surface 2041 of the first component 2031 facing the adapter plate 2022, so that the connection area between the first component 2031 and the second component 2032 is larger and is not easy to separate, and the structural stability of the pole assembly 203 is better.

[0155] According to some embodiments of the present application, referring again to FIGS. 10 and 11, the second protrusion 2035 is integrally formed with the adapter plate 2022.

[0156] For example, the adapter plate 2022 and the second protrusion 2035 can be integrally formed by stamping, or the adapter plate 2022 and the second protrusion 2035 can be integrally formed by die casting.

[0157] The second protrusion 2035 is integrally formed with the adapter plate 2022, that is, the second protrusion 2035 and the adapter plate 2022 are an integral piece, so that the number of parts can be reduced, the connection process is reduced, the assembly efficiency of the pole assembly 203 is improved, and there is no gap between the second protrusion 2035 and the adapter plate 2022, and the flow performance of the second protrusion 2035 and the adapter plate 2022 is better.

[0158] According to some embodiments of the present application, referring to FIG. 12, the adapter piece 2022 comprises a side wall surface 2027 facing away from the pole assembly 203, and a portion of the side wall surface 2027 opposite the second protrusion 2035 is formed with a first groove 2026.

[0159] That is, the adapter piece 2022 can be directly bent so that a portion of the adapter piece 2022 is connected to the pole assembly 203 and a portion of the adapter piece 2022 is spaced apart from the pole assembly 203 to form the avoidance space 204, and the adapter piece 2022 is directly bent so as not to be in contact with the first welding portion 2033, so that the processing of the adapter piece 2022 is more convenient, the structure is simpler, the processing cost is lower, and the quality is lighter.

[0160] According to some embodiments of the present application, referring to FIG. 5, the conductive member 2023 comprises the tab portion 2024 connected to the adapter piece 2022, the tab portion 2024 is connected to the electrode body 2021, and the adapter piece 2022 is connected to the pole assembly 203, referring to FIG. 13, the second component 2032 comprises the base portion 2037 and the convex 2038 protruding from the base portion 2037 to the first component 2031, the base portion 2037 is used to clamp the wall portion of the shell 201 together with the first component 2031 and is connected to the adapter piece 2022, the convex 2038 is connected to the first component 2031 and forms the first welding portion 2033, and the side of the convex 2038 facing the adapter piece 2022 is formed with a second groove 2040, the second groove 2040 forms the avoidance space 204, and the first welding portion 2033 is exposed in the second groove 2040.

[0161] Exemplarily, the first component 2031 can be completely located outside the shell 201, the convex 2038 is located in the mounting hole 2011, and the base portion 2037 is located in the accommodating cavity; or, the first component 2031 can be partially located in the mounting hole 2011, the convex 2038 is located in the mounting hole 2011, and the base portion 2037 is located in the accommodating cavity.

[0162] That is, by bending the second component 2032, the avoidance space 204 is formed between the convex 2038 and the adapter piece 2022, so that the avoidance space 204 does not additionally occupy the space of the accommodating cavity, but forms the avoidance space 204 by reducing the volume of the pole assembly 203, so that it is beneficial to leave enough space for the accommodation of the electrode assembly 202 and reduce the influence of the formation of the avoidance space 204 on the arrangement of the electrode assembly 202.

[0163] According to some embodiments of the present application, in the through direction of the mounting hole 2011, the size D of the avoidance space 204 is 0.2-0.5 mm.

[0164] For example, the size D of the avoiding space 204 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm or any value between any two of the values. In the through direction of the mounting hole 2011, the size D of the avoiding space 204 is 0.2-0.5 mm, in other words, in the through direction of the mounting hole 2011, the distance between the part of the electrode assembly 202 and the conductive member 2023 that are spaced apart is 0.2-0.5 mm; or in other words, the size of the first protrusion 2034 in the through direction of the mounting hole 2011 is 0.2-0.5 mm, and the size of the second protrusion 2035 in the through direction of the mounting hole 2011 is 0.2-0.5 mm.

[0165] With the size D of the avoiding space 204 in the range, on the one hand, the size D of the avoiding space 204 will not be too small to better accommodate the protruding part of the first welding part 2033, and on the other hand, the size D of the avoiding space 204 will not be too large to occupy too much space and affect the arrangement of the electrode assembly 202.

[0166] According to some embodiments of the present application, as shown in FIGS. 6, 9-13, the first part 2031 includes a first sub-part 20311 and a second sub-part 20312 connected together, the first sub-part 20311 is arranged outside the shell 201, the second part 2032 is arranged in the accommodating cavity, the second sub-part 20312 is connected to the second part 2032 through the mounting hole 2011, the first sub-part 20311 and the second part 2032 jointly clamp the wall part of the shell 201, an insulating assembly 206 is arranged between the pole post assembly 203 and the shell 201, the insulating assembly 206 is used to insulate the pole post assembly 203 and the wall part of the shell 201, the conductive member 2023 includes a tab part 2024 and a transition piece 2022 connected together, the tab part 2024 is connected to the electrode body 2021, and the transition piece 2022 is connected to the pole post assembly 203.

[0167] For example, as shown in FIG. 6, the insulating assembly 206 includes a first insulating member 2061, a sealing member 2062 and a second insulating member 2063, the sealing member 2062 covers the circumferential edge of the mounting hole 2011, the first insulating member 2061 is arranged between the outer wall surface of the shell 201 and the first sub-part 20311, and the second insulating member 2063 is arranged between the inner wall surface of the shell 201 and the second part 2032.

[0168] Exemplarily, the first insulation member 2061 can have a first limiting portion 2064 for limiting or positioning the first sub portion 20311, so as to reduce the possibility of dislocation of the first sub portion 20311 relative to the shell 201. The second insulation member 2063 has a second limiting portion 2065 for limiting or positioning the second portion 2032, so as to reduce the possibility of dislocation of the second portion 2032 relative to the shell 201.

[0169] Further, the outer wall of the shell 201 is formed with a first groove 2012, and the first limiting portion 2064 is at least partially arranged in the first groove 2012, so as to reduce the possibility of dislocation of the first limiting portion 2064 relative to the shell 201.

[0170] The first sub portion 20311 and the second portion 2032 jointly clamp the wall portion of the shell 201, and can play a limiting role, which is conducive to stably fixing the pole assembly 203 on the shell 201. By arranging the insulation assembly 206, the insulation assembly 206 can reduce the possibility of electrical conduction between the pole assembly 203 and the shell 201, and can also play a role in sealing the gap between the pole assembly 203 and the shell 201, so as to reduce the possibility of water or impurities entering the inside of the battery monomer 20, thereby improving the use reliability of the battery monomer 20.

[0171] According to the second aspect of the embodiments of the present application, the embodiments of the present application further provide a battery device 100, which comprises the battery monomer 20 of any one of the above-mentioned schemes. It should be noted that the battery device 100 according to the embodiments of the present application can include the box body 10, or can not include the box body 10.

[0172] Since the battery device 100 of the embodiment of the present application comprises the battery cell 20 of any of the above-mentioned solutions, the battery device 100 of the embodiment of the present application at least has the following advantages: by forming the avoiding space 204 by partially spacing the conductive member 2023 and the pole assembly 203, the first welding part 2033 is arranged at one end of the pole assembly 203 towards the avoiding space 204, so that the protruding part of the first welding part 2033 can be accommodated in the avoiding space 204, in this way, when the conductive member 2023 and the pole assembly 203 are connected, the conductive member 2023 can be better connected with other parts of the pole assembly 203 without being easily in contact with the first welding part 2033, or in other words, the first welding part 2033 will not interfere with the connection of the conductive member 2023, so that the influence of the first welding part 2033 on the connection reliability between the pole assembly 203 and the conductive member 2023 can be reduced, when the conductive member 2023 and the pole assembly 203 are connected, the connection defect problem is not easy to occur, which is conducive to improving the welding success rate, and is conducive to making the conductive member 2023 and the pole assembly 203 have sufficient effective connection area, and the consistency of the effective connection area between the conductive member 2023 and the pole assembly 203 is better, thereby the charge and discharge performance and the use reliability of the battery cell 20 can be improved.

[0173] According to the third aspect embodiment of the present application, the embodiment of the present application further provides a power utilization device, the power utilization device comprises the battery device 100 of any of the above-mentioned solutions, and the battery device 100 is used for providing electric energy for the power utilization device.

[0174] According to the third aspect of the present application, the battery device 100 is used to provide power for the power consuming device. Thus, by using the above-mentioned battery device 100, the first welding part 2033 is arranged at one end of the pole assembly 203 facing the avoiding space 204, so that the protruding part of the first welding part 2033 can be accommodated in the avoiding space 204. Thus, when the conductive part 2023 and the pole assembly 203 are connected, the conductive part 2023 can be better connected with other parts of the pole assembly 203 without being easily in contact with the first welding part 2033, or in other words, the first welding part 2033 does not interfere with the connection between the pole assembly 203 and the conductive part 2023. Thus, the influence of the first welding part 2033 on the connection reliability between the pole assembly 203 and the conductive part 2023 can be reduced, and the connection defect problem can be avoided when the conductive part 2023 and the pole assembly 203 are connected, which is beneficial to improve the welding success rate and to ensure that the conductive part 2023 and the pole assembly 203 have sufficient effective connection area, and the consistency of the effective connection area between the conductive part 2023 and the pole assembly 203 is better, thereby improving the charging and discharging performance and the use reliability of the battery monomer 20.

[0175] According to the fourth aspect of the present application, the energy storage device 2000 comprises the battery device 100 of any of the above-mentioned schemes.

[0176] According to the third aspect of the present application, the battery device 100 is used to provide power for the power consuming device. Thus, by using the above-mentioned battery device 100, the first welding part 2033 is arranged at one end of the pole assembly 203 facing the avoiding space 204, so that the protruding part of the first welding part 2033 can be accommodated in the avoiding space 204. Thus, when the conductive part 2023 and the pole assembly 203 are connected, the conductive part 2023 can be better connected with other parts of the pole assembly 203 without being easily in contact with the first welding part 2033, or in other words, the first welding part 2033 does not interfere with the connection between the pole assembly 203 and the conductive part 2023. Thus, the influence of the first welding part 2033 on the connection reliability between the pole assembly 203 and the conductive part 2023 can be reduced, and the connection defect problem can be avoided when the conductive part 2023 and the pole assembly 203 are connected, which is beneficial to improve the welding success rate and to ensure that the conductive part 2023 and the pole assembly 203 have sufficient effective connection area, and the consistency of the effective connection area between the conductive part 2023 and the pole assembly 203 is better, thereby improving the charging and discharging performance and the use reliability of the battery monomer 20.

[0177] The battery cell 20, the battery device 100 and the vehicle 1000 having the same according to six embodiments of the present application are described below in conjunction with the accompanying drawings.

[0178] Embodiment One

[0179] As shown in FIGS. 1-6, the vehicle 1000 includes a battery device 100, the battery device 100 including a plurality of battery cells 20, the battery cell 20 including a housing 201 having a receiving cavity, an electrode assembly 202 disposed in the receiving cavity, the electrode assembly 202 including an electrode body 2021 and a conductive member 2023 connected to each other, the conductive member 2023 including a tab portion 2024 and a jumper 2022, the tab portion 2024 connected to the electrode body 2021.

[0180] The pole assembly 203 includes a first part 2031 and a second part 2032, the second part 2032 disposed in the receiving cavity, the second part 2032 having a through hole 2039, the first part 2031 disposed through the mounting hole 2011 and the through hole 2039, the first part 2031 connected to the hole wall of the through hole 2039 to form a first welding portion 2033.

[0181] The pole assembly 203 includes a first wall surface 2101 and a second wall surface 2036 toward a side surface of the jumper, the first wall surface 2101 provided with a first protrusion 2034, the first protrusion disposed on the first part 2031, the first protrusion 2034 spaced apart from the first welding portion 2033; the first protrusion 2034 connected to the jumper 2022 to space apart the second wall surface 2036 from the jumper 2022 to form an avoiding space 204.

[0182] The first protrusion 2034 is integrally formed with the first part 2031. In the through direction of the mounting hole 2011, the size D of the avoiding space 204 is 0.2-0.5 mm. The first part 2031 includes a first sub-part 20311 and a second sub-part 20312 connected to each other, the first sub-part 20311 disposed outside the housing 201, the second part 2032 disposed in the receiving cavity, the second sub-part 20312 disposed through the mounting hole 2011 and connected to the second part 2032, the first sub-part 20311 and the second part 2032 jointly clamping the wall portion of the housing 201, an insulation assembly 206 disposed between the pole assembly 203 and the housing 201, the insulation assembly 206 used for insulation sealing between the pole assembly 203 and the wall portion of the housing 201, the jumper 2022 connected to the pole assembly 203.

[0183] Embodiment Two

[0184] The difference between the second embodiment and the first embodiment is that, as shown in FIGS. 1-3 and 7-9, the first protrusion 2034 is provided on the second component 2032.

[0185] For the first and second embodiments, by providing the first protrusion 2034 on the pole assembly 203, the first protrusion 2034 is connected with the adapter plate 2022, thereby forming the avoidance space 204 that can be used to accommodate part of the first welding portion 2033, reducing the possibility of interference between the adapter plate 2022 and the first welding portion 2033.

[0186] The third embodiment

[0187] As shown in FIGS. 1-3 and 10, the vehicle 1000 includes a battery device 100, the battery device 100 including a plurality of battery cells 20, the battery cell 20 including a housing 201 having an accommodation cavity, an electrode assembly 202 provided in the accommodation cavity, and a pole assembly 203. The electrode assembly 202 includes an electrode body 2021 and a conductive member 2023 connected with each other, and the conductive member 2023 includes a tab portion 2024 and an adapter plate 2022 connected with the electrode body 2021.

[0188] The pole assembly 203 includes a first component 2031 and a second component 2032, the second component 2032 being provided in the accommodation cavity and having a through hole 2039, and the first component 2031 being provided through the mounting hole 2011 and the through hole 2039 and connected with the hole wall of the through hole 2039 to form a first welding portion 2033.

[0189] The side of the adapter plate 2022 facing the pole assembly 203 includes a third wall surface 2028 and a fourth wall surface 2025, the third wall surface 2028 being provided with a second protrusion 2035 connected with the first component 2031 to space the fourth wall surface 2025 apart from the pole assembly 203 to form an avoidance space 204, and the second protrusion 2035 being integrally formed with the adapter plate 2022. In the through direction of the mounting hole 2011, the size D of the avoidance space 204 is 0.2-0.5 mm.

[0190] The first component 2031 includes a first sub-component 20311 and a second sub-component 20312 connected with each other, the first sub-component 20311 being provided outside the housing 201, the second component 2032 being provided in the accommodation cavity, the second sub-component 20312 being provided through the mounting hole 2011 and connected with the second component 2032, the first sub-component 20311 and the second component 2032 together clamping the wall portion of the housing 201, an insulation assembly 206 being provided between the pole assembly 203 and the wall portion of the housing 201 for insulation sealing therebetween, and the adapter plate 2022 being connected with the pole assembly 203.

[0191] Embodiment Four

[0192] The difference between Embodiment Four and Embodiment Three is that, as shown in FIG. 11, the second protrusion 2035 is connected with the second component 2032.

[0193] For Embodiment Three and Embodiment Four, by arranging the second protrusion 2035 on the conductive piece 2023, the second protrusion 2035 is connected with the pole assembly 203, thereby constructing the avoidance space 204 that can be used to accommodate part of the first welding portion 2033, thereby reducing the possibility of interference between the adapter piece 2022 and the first welding portion 2033.

[0194] Embodiment Five

[0195] The difference between Embodiment Five and Embodiment Three is that, as shown in FIGS. 1-3 and 12, the adapter piece 2022 includes a side wall surface 2027 facing away from the pole assembly 203, and a portion of the side wall surface 2027 opposite the second protrusion 2035 is formed with a first groove 2026.

[0196] Embodiment Six

[0197] As shown in FIGS. 1-3 and 13, the vehicle 1000 includes a battery device 100, which includes a plurality of battery monomers 20, each of which includes a housing 201 having an accommodation cavity, an electrode assembly 202 arranged in the accommodation cavity, and a pole assembly 203. The electrode assembly 202 includes an electrode body 2021 and a conductive piece 2023 connected with each other, and the conductive piece 2023 includes a tab portion 2024 and an adapter piece 2022, with the tab portion 2024 connected with the electrode body 2021.

[0198] The pole assembly 203 includes a first component 2031 and a second component 2032, the second component 2032 including a base portion 2037 and a protruding portion 2038 protruding from the base portion 2037 toward the first component 2031, the base portion 2037 being used to clamp a wall portion of the housing 201 together with the first component 2031 and being connected with the adapter piece 2022, the protruding portion 2038 being connected with the first component 2031 and forming a first welding portion 2033, and a second groove 2040 being formed on a side of the protruding portion 2038 facing the adapter piece 2022, the second groove 2040 forming an avoidance space 204, and the first welding portion 2033 being exposed in the second groove 2040. In the through direction of the mounting hole 2011, the size D of the avoidance space 204 is 0.2-0.5 mm.

[0199] The first component 2031 comprises a first sub-component 20311 and a second sub-component 20312 connected together, the first sub-component 20311 is arranged outside the shell 201, the second component 2032 is arranged in the accommodating cavity, the second sub-component 20312 is arranged in the mounting hole 2011 and connected with the second component 2032, the first sub-component 20311 and the second component 2032 jointly clamp the wall portion of the shell 201, the insulating assembly 206 is arranged between the pole assembly 203 and the shell 201, and the insulating assembly 206 is used for insulating sealing between the pole assembly 203 and the wall portion of the shell 201, and the adapter plate 2022 is connected with the pole assembly 203.

[0200] In the related art, the first component 2031 and the second component 2032 are welded by butt welding, to form the first welding portion 2033, but the first welding portion 2033 will have a protruding portion, which will cause the adapter plate 2022 and the pole assembly 203 to be unable to be close when welded, and the welding portion of the adapter plate 2022 and the pole assembly 203 will have a welding defect problem.

[0201] The application avoids the protruding portion of the first welding portion 2033 by spacing the adapter plate 2022 and the pole assembly 203 apart, thereby improving the welding success rate of the adapter plate 2022 and the pole assembly 203. The pole assembly 203 comprises the first component 2031 and the second component 2032, the first component 2031 and the second component 2032 are connected by butt welding, the butt welding is welded to form the first welding portion 2033, and a gap (>0) exists between the first welding portion 2033 and the side of the adapter plate 2022 facing the pole assembly 203, so that the protruding portion of the first welding portion 2033 can be avoided, and the welding success rate of the adapter plate 2022 and the pole assembly 203 is improved.

[0202] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0203] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, wherein, The application relates to a battery, which comprises: a shell having a receiving cavity; an electrode assembly arranged in the receiving cavity, the electrode assembly comprising an electrode body and a conductive member connected to the electrode body; a post assembly arranged in a mounting hole of the shell, the post assembly being connected to the electrode assembly through the conductive member, the post assembly comprising a first part and a second part, the first part and the second part being connected to form a first welding portion, the conductive member being spaced apart from the post assembly to form an avoiding space, and the first welding portion being arranged at one end of the post assembly facing the avoiding space.

2. The battery cell of claim 1, wherein, The side of the post assembly facing the conductive member comprises a first wall surface and a second wall surface, the first wall surface is provided with a first protrusion, the first protrusion is connected to the conductive member so that the second wall surface is spaced apart from the conductive member to form an avoiding space.

3. The battery cell of claim 2, wherein, The second part is arranged in the receiving cavity, the second part has a through hole, the first part is arranged in the mounting hole and the through hole, the first part is connected to the hole wall of the through hole to form the first welding portion, and the first protrusion is spaced apart from the first welding portion; wherein the first protrusion is arranged on the first part; and / or the first protrusion is arranged on the second part.

4. The battery cell of claim 2, wherein, The second part is located between the first part and the conductive member, and the first protrusion is arranged on the second part.

5. The battery cell of claim 2, wherein, The first protrusion and the first part are integrally formed; or the first protrusion and the second part are integrally formed.

6. The battery cell of claim 1, wherein, The conductive member comprises a tab part and a transition sheet connected to each other, the tab part is connected to the electrode body, the transition sheet is connected to the post assembly, one side of the transition sheet facing the post assembly comprises a third wall surface and a fourth wall surface, the third wall surface is provided with a second protrusion, the second protrusion is connected to the post assembly so that the fourth wall surface is spaced apart from the post assembly to form the avoiding space.

7. The battery cell of claim 6, wherein, The second part is arranged in the receiving cavity, the second part has a through hole, the first part is arranged in the mounting hole and the through hole, the first part is connected to the hole wall of the through hole to form the first welding portion, and the second protrusion is spaced apart from the first welding portion; wherein the second protrusion is connected to the first part; or / and the second protrusion is connected to the second part.

8. The battery cell of claim 6, wherein, The first part comprises an end wall surface facing the transition sheet, and the second part is connected between the end wall surface of the first part and the second protrusion.

9. The battery cell of claim 6, wherein, The second protrusion is integrally formed with the transition sheet.

10. The battery cell of claim 6, wherein, The transition sheet comprises a side wall surface facing away from the post assembly, and a part of the side wall surface opposite to the second protrusion is provided with a first groove.

11. The battery cell of claim 1, wherein, The conductive member comprises a connected tab and a transition piece, the tab is connected with the electrode body, and the transition piece is connected with the post assembly, the second part comprises a base part and a convex bump protruding from the base part to the first part, the base part is used to clamp the wall part of the shell together with the first part and is connected with the transition piece, the convex bump is connected with the first part and forms the first welding part, a second groove is formed on the side of the convex bump facing the transition piece, the second groove forms the avoiding space, and the first welding part is exposed in the second groove.

12. The battery cell of claim 1, wherein, In the through direction of the mounting hole, the size of the avoiding space is 0.2-0.5 mm.

13. The battery cell of any one of claims 1-5, 12, wherein, The first part comprises a first subpart and a second subpart connected with each other, the first subpart is arranged outside the shell, the second part is arranged in the accommodating cavity, the second subpart is connected with the second part through the mounting hole, the first subpart and the second part clamp the wall part of the shell together, an insulation assembly is arranged between the post assembly and the shell, the insulation assembly is used to insulate the post assembly and the wall part of the shell, and the conductive member comprises a connected tab and a transition piece, the tab is connected with the electrode body, and the transition piece is connected with the post assembly.

14. A battery device, wherein, The battery device comprises a plurality of battery cells according to any one of claims 1-13.

15. An electrical device, comprising: The battery device according to claim 14 is used to provide electric energy for the electric device.

16. An energy storage device, wherein, The battery device according to claim 14.

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