Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment. The battery device includes a battery cell, a bus member, and a separator. The battery monomer comprises a shell, an electrode assembly, an electrode terminal and an insulating part, the electrode assembly is arranged in the shell, the shell comprises a wall part, the electrode terminal is arranged on the wall part, the insulating part is connected to the wall part, the insulating part at least partially surrounds the electrode terminal and is fixed with the electrode terminal, and the electrode terminal is connected to the electrode assembly; the electrode terminal extends beyond the insulator in a direction away from the electrode assembly. At least part of the confluence component is located on the side, away from the electrode assembly, of the electrode terminal and connected to the electrode terminal. The separator is arranged on the side, away from the electrode assembly, of the wall part, and at least part of the separator is located between the confluence component and the insulating part. The separator can generate a certain blocking effect on welding particles generated by welding the electrode terminal and the confluence component, so that the possibility that the welding particles fall between the separator and the wall part is reduced, the risk of short circuit is favorably reduced, and the reliability of the battery device is improved.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery device and an electrical device. Background Art

[0002] With the development of new energy technologies, batteries are more widely used. For example, batteries are not only applied to energy storage power systems such as hydroelectric, thermal, wind, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in multiple fields such as military equipment and aerospace.

[0003] The development of battery technology needs to consider multiple design factors simultaneously. For example, performance parameters such as energy density, cycle life, discharge capacity, charge-discharge rate, etc. In addition, the reliability of the battery also needs to be considered. Summary of the Utility Model

[0004] The embodiments of this application provide a battery device and an electrical device, which can improve reliability.

[0005] According to the first aspect of this application, this application provides a battery device. The battery device includes battery cells, a busbar component, and a separator. Each battery cell includes a housing, an electrode assembly, an electrode terminal, and an insulating member. The electrode assembly is disposed inside the housing. The housing includes a wall portion. The electrode terminal is disposed on the wall portion. The insulating member is connected to the wall portion. The insulating member at least partially surrounds the electrode terminal and is fixed to the electrode terminal. The electrode terminal is connected to the electrode assembly. The electrode terminal extends beyond the insulating member in a direction away from the electrode assembly. At least a part of the busbar component is located on a side of the electrode terminal away from the electrode assembly and is connected to the electrode terminal. The separator is disposed on a side of the wall portion away from the electrode assembly. At least a part of the separator is located between the busbar component and the insulating member. Along the thickness direction of the wall portion, the separator can cover or block at least a part of the insulating member and the position where the insulating member and the wall portion are joined. The separator can have a certain blocking effect on the welding particles generated by welding the electrode terminal and the busbar component, reducing the possibility of welding particles falling between the separator and the wall portion, which is beneficial to reducing the short-circuit risk and improving the reliability of the battery device.

[0006] In some embodiments, the part of the electrode terminal extending beyond the insulating member is spaced apart from the separator in a direction perpendicular to the thickness direction of the wall portion. In the direction perpendicular to the thickness direction, a gap can be formed between the part of the electrode terminal extending beyond the insulating member and the separator. Through this gap, the assembly tolerance between the separator and the electrode terminal can be absorbed, reducing interference phenomena, which is beneficial to improving the assembly efficiency.

[0007] In some embodiments, the spacer includes a main body portion and a thinning portion. The main body portion surrounds the thinning portion, and the thickness of the thinning portion is less than that of the main body portion. At least a part of the thinning portion is located between the current collecting component and the insulating member. Along the thickness direction of the wall portion, the projection of the main body portion and the projection of the insulating member do not overlap. The thinning portion can block welding particles and does not affect the welding of the current collecting component and the electrode terminal due to excessive thickness, which is beneficial to improving the welding effect of the current collecting component and the electrode terminal. Moreover, the thickness of the main body portion is greater than that of the thinning portion, and the structural strength of the main body portion is relatively large, reducing the possibility of deformation of the spacer.

[0008] In some embodiments, the main body portion includes a first sub-portion and a second sub-portion. The second sub-portion is connected between the first sub-portion and the thinning portion, and the second sub-portion protrudes from the surface of the first sub-portion facing away from the wall portion in a direction away from the wall portion. By the convex bending of the second sub-portion relative to the first sub-portion, the thinning portion can be lifted outward of the wall portion, facilitating at least a part of the thinning portion to be located between the current collecting component and the insulating member. At the same time, a certain concave space can be formed on the side of the first sub-portion facing away from the wall portion, and this concave space can accommodate or avoid structures such as the pressure strip in the box, which is beneficial to improving the space utilization rate in the box and the installation stability of the battery cell.

[0009] In some embodiments, the main body portion includes a third sub-portion and a fourth sub-portion. The fourth sub-portion is connected between the third sub-portion and the thinning portion, and the fourth sub-portion is recessed from the surface of the third sub-portion facing away from the wall portion in a direction close to the wall portion. Thus, the interval between the third sub-portion and the wall portion can be increased, reducing the possibility of the third sub-portion pressing against the wall portion in a direction close to the electrode assembly and reducing the adverse effect on the welding effect between the current collecting component and the electrode terminal.

[0010] In some embodiments, the fourth sub-portion and the thinning portion enclose a concave space, and at least a part of the current collecting component is disposed in the concave space. The current collecting component and the spacer can share at least a part of the space in the thickness direction, and the structural layout is more compact, which is beneficial to improving the space utilization rate in the box and the energy density of the battery device.

[0011] In some embodiments, the thickness of the thinning portion is less than the dimension by which the electrode terminal extends beyond the insulating member along the thickness direction of the wall portion. The portion of the thinning portion located between the current collecting component and the insulating member does not squeeze the current collecting component and the insulating member in the thickness direction and does not affect the welding effect between the current collecting component and the electrode terminal.

[0012] In some embodiments, along the thickness direction of the wall portion, the thinning portion is spaced apart from the insulating member. The thinning portion does not exert a force on the insulating member in the thickness direction, does not squeeze the insulating member in a direction away from the current collecting component, and does not affect the welding effect between the current collecting component and the electrode terminal.

[0013] In some embodiments, the spacer is provided with an avoidance hole that penetrates the thinning portion; a part of the electrode terminal is exposed to the side of the spacer facing the current collecting component through the avoidance hole and is connected to the current collecting component. The thinning portion can surround the avoidance hole, and the welding particles can be blocked by the thinning portion at any position in the circumferential direction of the electrode terminal, which is beneficial to further reducing the short-circuit risk and improving the reliability.

[0014] In some embodiments, along the thickness direction of the wall portion, the projection of the portion of the electrode terminal that extends beyond the insulating member is located within the projection of the avoidance hole, and the projections of the insulating member and the spacer partially overlap. A gap can be formed between the portion of the electrode terminal that extends beyond the insulating member and the hole wall of the avoidance hole, and the assembly tolerance between the spacer and the electrode terminal can be absorbed through this gap, reducing the interference phenomenon, which is beneficial to improving the assembly efficiency.

[0015] In some embodiments, along the thickness direction of the wall portion, the spacer is spaced apart from the wall portion. When the current collecting component is connected to the electrode terminal, the spacer will not squeeze the wall portion in the direction away from the current collecting component, and will not affect the welding effect between the current collecting component and the electrode terminal.

[0016] In some embodiments, the housing includes a housing body and an end cover, the housing body has an opening, and the end cover covers the opening; the wall portion is the end cover.

[0017] According to the second aspect of the present application, embodiments of the present application further provide an electrical device, which includes a battery device provided according to any embodiment of the present application, and the battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.

[0020] Figure 2 is an exploded structural diagram of a battery device provided by some embodiments of the present application.

[0021] Figure 3 is an exploded structural diagram of a battery cell of a battery device provided by some embodiments of the present application.

[0022] Figure 4 is a cross-sectional schematic diagram of a partial structure of a battery device provided by some embodiments of the present application.

[0023] Figure 5 isFigure 4 Schematic diagram of the enlarged structure of the middle region A.

[0024] Figure 6 Is Figure 2 Partial exploded view of the separator and the battery cell of the battery device shown.

[0025] Figure 7 Partial cross-sectional view of the battery device provided by some other embodiments of the present application.

[0026] In the drawings:

[0027] Vehicle 1000, battery device 100, controller 200, motor 300;

[0028] Battery cell 10, housing 11, wall portion 111, shell 11a, opening 11a1, end cap 11b,

[0029] Electrode assembly 12, electrode terminal 13, insulating member 14, box body 20, first box body portion 21, second box body portion 22, bus bar member 30, separator 40, main body portion 41, first sub-portion 411, second sub-portion 412, third sub-portion 413, fourth sub-portion 414, thinning portion 42, avoidance hole 43, concave space 44, flexible circuit board 50, thickness direction X. Detailed implementation manners

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0032] References to "embodiments" in this application mean that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0033] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] The term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0035] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings in the embodiments of this application, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0036] The term "a plurality of" that appears in this application refers to two or more (including two).

[0037] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximately parallelism as conventionally understood in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximately perpendicularity as conventionally understood in engineering.

[0038] In the embodiments of this application, the battery cell can be a secondary battery cell, and a secondary battery cell refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0039] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium-metal battery cell, a sodium-metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of this application are not limited thereto.

[0040] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. There is no special limitation in this application.

[0041] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, parallel, or in a hybrid connection through a busbar component.

[0042] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0043] The battery device generally includes a box body for encapsulating one or more battery cells. The box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0044] As an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties. The battery cell assembly can be accommodated in the box body by fixing the battery module in the box body. As an example, the box body may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0045] In some embodiments, the box body can be a part of the chassis structure of a vehicle. For example, a part of the box body can become at least a part of the floor of the vehicle, or a part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0046] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0047] The battery device generally uses a busbar component to connect each battery cell, and the busbar component and the battery cell are partially separated by a separator. The separator can also play a role in carrying the busbar component. The separator can be, for example, a separator plate. The electrode terminal of the battery cell is connected to the busbar component by welding, and an insulating member is fixedly provided around the electrode terminal to insulate and isolate the electrode terminal from the outer shell of the battery cell through the insulating member. To ensure a certain assembly tolerance, the aperture of the electrode terminal avoidance hole on the separator is much larger than the outer diameter of the insulating member, resulting in a certain gap between the separator and the insulating member. However, the welding particles generated during the welding of the electrode terminal and the busbar component may fall between the outer shell of the battery cell and the separator through the gap between the separator and the insulating member, thus causing an internal short circuit phenomenon.

[0048] In view of this, an embodiment of the present application provides a technical solution. By disposing at least a part of the spacer between the current collecting member and the insulating member, the spacer can cover at least a part of the insulating member, and the spacer can have a certain blocking effect on the welding particles generated by welding the electrode terminal and the current collecting member, reducing the possibility of the welding particles falling between the spacer and the wall portion, which is beneficial to reducing the short-circuit risk and improving the reliability of the battery device.

[0049] The technical solution provided by the embodiment of the present application can be used in battery devices, electrical equipment using the battery device as a power source, or various energy storage systems using the battery device as an energy storage element.

[0050] The electrical equipment can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc., and the spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0051] For the convenience of description, the following embodiments will be described by taking the electrical equipment as a vehicle as an example.

[0052] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application. Referring to Figure 1 , the vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or an extended-range electric vehicle, etc. The vehicle 1000 is internally provided with a battery device 100, and the battery device 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 can also 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, for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0053] In some embodiments of the present application, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0054] Figure 2 is an exploded structural schematic diagram of a battery device provided by some embodiments of the present application. Referring to Figure 2 , the battery device 100 can include a box body 20 and a plurality of battery cells 10, and the plurality of battery cells 10 are accommodated in the box body 20.

[0055] The housing 20 can be a component for accommodating the battery cells 10. The housing 20 provides an accommodation space for the battery cells 10, and the housing 20 can adopt various structures.

[0056] In some embodiments, the housing 20 can include a first housing part 21 and a second housing part 22. The first housing part 21 and the second housing part 22 cover each other, and the first housing part 21 and the second housing part 22 together define an accommodation space for accommodating the battery cells 10. The second housing part 22 can be a hollow structure with one end open, and the first housing part 21 is a plate-like structure. The first housing part 21 covers the open side of the second housing part 22 to form the housing 20 with an accommodation space; both the first housing part 21 and the second housing part 22 can also be hollow structures with one side open, and the open side of the first housing part 21 covers the open side of the second housing part 22 to form the housing 20 with an accommodation space. Of course, the first housing part 21 and the second housing part 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0057] To improve the sealing performance after the connection between the first housing part 21 and the second housing part 22, a sealing member, such as sealant, sealing ring, etc., can also be provided between the first housing part 21 and the second housing part 22.

[0058] Assume that the first housing part 21 covers the top of the second housing part 22. The first housing part 21 can also be called the upper cover, and the second housing part 22 can also be called the lower housing.

[0059] In the battery device 100, the battery cells 10 can be one or multiple. If there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 10.

[0060] The multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 10 is accommodated in the housing 20; of course, it can also be that the multiple battery cells 10 are first connected in series, in parallel, or in a mixed connection to form battery modules, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the housing 20.

[0061] Exemplarily, the battery cell 10 can be the smallest unit that makes up the battery.

[0062] Figure 3 It is a schematic exploded view of the battery cells of the battery device provided in some embodiments of the present application. Figure 4 It is a schematic cross-sectional view of a partial structure of the battery device provided in some embodiments of the present application. Figure 5 It is Figure 4 The enlarged schematic view of the structure of area A in Figures 2 to 5, the battery device 100 includes battery cells 10, a current collecting component 30, and a separator 40. The battery cell 10 includes a housing 11, an electrode assembly 12, an electrode terminal 13, and an insulating member 14. The electrode assembly 12 is disposed within the housing 11. The housing 11 includes a wall portion 111. The electrode terminal 13 is disposed on the wall portion 111. The insulating member 14 is connected to the wall portion 111. The insulating member 14 at least partially surrounds the electrode terminal 13 and is fixed to the electrode terminal 13. The electrode terminal 13 is connected to the electrode assembly 12, and the electrode terminal 13 extends beyond the insulating member 14 in a direction away from the electrode assembly 12. At least a portion of the current collecting component 30 is located on a side of the electrode terminal 13 away from the electrode assembly 12 and is connected to the electrode terminal 13. The separator 40 is disposed on a side of the wall portion 111 away from the electrode assembly 12, and at least a portion of the separator 40 is located between the current collecting component 30 and the insulating member 14.

[0063] The electrode assembly 12 is a component in the battery cell 10 where an electrochemical reaction occurs.

[0064] The number of the electrode assemblies 12 can be one or multiple.

[0065] The housing 11 has a hollow structure, and an accommodation space for accommodating the electrode assembly 12 and an electrolyte is formed inside it. The shape of the housing 11 can be cylindrical, prismatic, cuboid, or other shapes.

[0066] Optionally, the housing 11 may include a housing body 11a and an end cap 11b, and the housing body 11a and the end cap 11b can be separate components. The housing body 11a has an opening, and the end cap 11b covers the opening of the housing body 11a.

[0067] The housing body 11a can be open at one end or both ends. Exemplarily, the housing body 11a has a structure with an opening on one side, and the end cap 11b is provided as one and covers the opening of the housing body 11a. As another example, the housing body 11a can also have a structure with openings on both sides, and the end caps 11b are provided as two, and the two end caps 11b respectively cover the two openings of the housing body 11a.

[0068] The housing body 11a may include a plurality of integrally formed shell walls, and the end cap 11b and the plurality of shell walls of the housing body 11a together enclose the internal space of the housing 11.

[0069] The material of the housing body 11a can be various, such as copper, iron, aluminum, aluminum alloy, etc. The material of the end cap 11b can be the same as or different from that of the housing body 11a. Optionally, the end cap 11b can be made of a material with a certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.). In this way, the end cap 11b is not easily deformed when subjected to extrusion and collision, enabling the battery cell 10 to have higher structural strength and improved reliability.

[0070] The wall portion 111 may be an end cover 11 b or one of the walls of the housing 11 a .

[0071] The electrode terminal 13 is electrically connected to the electrode assembly 12 and is used to draw current from the electrode assembly 12. The electrode terminal 13 can be directly connected to the electrode assembly 12 or indirectly connected to the electrode assembly 12 via a switching component.

[0072] The electrode terminal 13 extends beyond the wall portion 111 in a direction away from the electrode assembly 12 . At least a portion of the electrode terminal 13 is located on a side of the wall portion 111 away from the electrode assembly 12 .

[0073] The insulating member 14 may surround at least a portion of the electrode terminal 13 and be fixed to the electrode terminal 13. The insulating member 14 is used to insulate and isolate the electrode terminal 13 from the wall portion 111. Optionally, the insulating member 14 may be made of plastic.

[0074] The insulating member 14 may extend beyond the wall portion 111 in a direction away from the electrode assembly 12 to improve its insulation isolation. The dimension of the insulating member 14 extending beyond the wall portion 111 along the thickness direction X of the wall portion 111 is smaller than the dimension of the electrode terminal 13 extending beyond the wall portion 111. After the electrode terminal 13 is connected to the busbar 30, a gap is formed between the insulating member 14 and the busbar 30.

[0075] Optionally, the wall portion 111 may be provided with a through hole, and a portion of the electrode terminal 13 is located in the through hole, so that the electrode terminal 13 is connected to the electrode assembly 12 located inside the housing 11 through the through hole.

[0076] Alternatively, the electrode terminal 13 may penetrate the wall portion 111 along the thickness direction X of the wall portion 111 so as to connect the electrode assembly 12 inside the housing 11 and the busbar 30 outside the housing 11 .

[0077] The busbar component 30 can be connected to the electrode terminal 13 by laser welding or other suitable welding methods. The busbar component 30 is used to connect the electrode terminal 13 to the management system of the battery device 100.

[0078] The busbar component 30 may be entirely located on the side of the electrode terminal 13 away from the electrode assembly 12 , or may be partially located on the side of the electrode terminal 13 away from the electrode assembly 12 .

[0079] The separator 40 is disposed on a side of the wall portion 111 away from the electrode assembly 12 , and the current collecting component 30 is located on a side of the separator 40 away from the wall portion 111 . The separator 40 is at least used to separate the wall portion 111 and the current collecting component 30 .

[0080] Optionally, the battery device 100 further includes a flexible circuit board 50, which is disposed on a side of the spacer 40 facing away from the wall portion 111 and is connected to the current collecting component 30. The spacer 40 is also used to isolate the flexible circuit board 50 and the wall portion 111.

[0081] The spacer 40 may be provided with an avoidance hole 43, and a part of the electrode terminal 13 may be exposed on a side of the spacer 40 facing away from the wall portion 111 through the avoidance hole 43 and connected to the current collecting component 30.

[0082] Optionally, the shape of the avoidance hole 43 may match the shape of the part of the electrode terminal 13 located outside the wall portion 111. Exemplarily, the part of the electrode terminal 13 located outside the wall portion 111 may be rectangular, and the avoidance hole 43 may be a square hole; the part of the electrode terminal 13 located outside the wall portion 111 may be cylindrical, and the avoidance hole 43 may be a circular hole. It can be understood that the outside of the wall portion 111 refers to the side of the wall portion 111 facing away from the electrode assembly 12.

[0083] Optionally, the spacer 40 may be a plate-like structure to increase its isolation area.

[0084] In one example, along the thickness direction X of the wall portion 111, the spacer 40 may be entirely located between the current collecting component 30 and the insulating member 14. For example, the spacer 40 may be a flat plate-like structure.

[0085] In another example, along the thickness direction X of the wall portion 111, the spacer 40 may also be only partially located between the current collecting component 30 and the insulating member 14, and other parts of the spacer 40 may protrude or recess along the thickness direction X so as to partially overlap with the current collecting component 30 or the insulating member 14. For example, the spacer 40 may be a plate-like structure with a pit or a protrusion.

[0086] The spacer 40 may be connected to the current collecting component 30 by riveting, screwing, bonding, clamping or other suitable means. The spacer 40 may also be connected to the box body 20 or the support structure in the box body 20 by riveting, screwing, bonding, clamping or other suitable means to support the spacer 40 through the box body 20 or the support structure.

[0087] The material of the spacer 40 may include insulating materials.

[0088] In the battery device 100 provided by the embodiment of the present application, by disposing the separator 40 on the side of the wall portion 111 away from the electrode assembly 12, along the thickness direction X, the separator 40 can cover at least a part of the wall portion 111, so as to replace the traditional insulating patch, which is beneficial to simplifying the structure and assembly process of the battery device 100. Moreover, at least a part of the separator 40 is located between the current collecting member 30 and the insulating member 14. Along the thickness direction X, the separator 40 can also cover or block at least a part of the insulating member 14 and the position where the insulating member 14 is connected to the wall portion 111. The separator 40 can have a certain blocking effect on the welding particles generated by the welding of the electrode terminal 13 and the current collecting member 30, reducing the possibility of the welding particles falling between the separator 40 and the wall portion 111, which is beneficial to reducing the short-circuit risk and improving the reliability of the battery device 100.

[0089] In some embodiments, referring to Figure 5 , the portion of the electrode terminal 13 extending beyond the insulating member 14 is spaced apart from the separator 40 in a direction perpendicular to the thickness direction X of the wall portion 111.

[0090] Optionally, along the thickness direction X, the projection of the portion of the electrode terminal 13 extending beyond the insulating member 14 is separated from the projection of the separator 40. The projection of the portion of the electrode terminal 13 extending beyond the insulating member 14 can be located within the projection of the avoidance hole 43.

[0091] Exemplarily, when the portion of the electrode terminal 13 located outside the wall portion 111 is cylindrical and the avoidance hole 43 is a circular hole, the direction perpendicular to the thickness direction X is the radial direction of the avoidance hole 43, and the diameter of the avoidance hole 43 can be greater than the diameter of the portion of the electrode terminal 13 extending beyond the insulating member 14.

[0092] In the embodiment of the present application, the portion of the electrode terminal 13 extending beyond the insulating member 14 is spaced apart from the separator 40. In a direction perpendicular to the thickness direction X, a gap can be formed between the portion of the electrode terminal 13 extending beyond the insulating member 14 and the separator 40. Through this gap, the assembly tolerance between the separator 40 and the electrode terminal 13 can be absorbed, reducing the interference phenomenon, which is beneficial to improving the assembly efficiency.

[0093] The applicant recognizes that during the welding process of the current collecting member 30 and the electrode terminal 13, the portion of the separator 40 located between the current collecting member 30 and the insulating member 14 may press the insulating member 14 in a direction away from the current collecting member 30, lifting the current collecting member 30, affecting the welding between the current collecting member 30 and the electrode terminal 13. There may be poor welding such as virtual welding or other welding defects between the current collecting member 30 and the electrode terminal 13, affecting the connection reliability.

[0094] Figure 6 Yes Figure 2 It is a partially exploded structural schematic diagram of the separator of the battery device and the battery cell shown. In some embodiments, referring toFigure 5 and Figure 6 , the spacer 40 includes a main body portion 41 and a thinning portion 42. The main body portion 41 surrounds the thinning portion 42, and the thickness of the thinning portion 42 is less than the thickness of the main body portion 41. At least a part of the thinning portion 42 is located between the current collecting member 30 and the insulating member 14. Along the thickness direction X of the wall portion 111, the projection of the main body portion 41 and the projection of the insulating member 14 do not overlap.

[0095] Optionally, the main body portion 41 and the thinning portion 42 are integrally formed structures.

[0096] Along the thickness direction X, at least a part of the main body portion 41 can be located between the wall portion 111 and the current collecting member 30. Optionally, the main body portion 41 can cover the wall portion 111 along the thickness direction X to improve the isolation effect of the spacer 40 on the wall portion 111.

[0097] In one example, along the thickness direction X, the thinning portion 42 can be entirely located between the current collecting member 30 and the insulating member 14, and the projection of the thinning portion 42 is located within the projection of the insulating member 14.

[0098] In another example, along the thickness direction X, the thinning portion 42 can also be partially located between the current collecting member 30 and the insulating member 14, and another part of the thinning portion 42 can be located between the wall portion 111 and the current collecting member 30.

[0099] Optionally, the surface of the thinning portion 42 facing the current collecting member 30 can be flush with at least a part of the surface of the main body portion 41 facing the current collecting member 30 to increase the contact area between the spacer 40 and the current collecting member 30 and improve the connection stability therebetween. The surface of the thinning portion 42 facing the wall portion 111 can be recessed from at least a part of the surface of the main body portion 41 facing the wall portion 111 in a direction away from the wall portion 111 so that the thickness of the thinning portion 42 is less than the thickness of the main body portion 41.

[0100] Along the thickness direction X, the projection of the main body portion 41 and the projection of the insulating member 14 do not overlap, and the projection of the main body portion 41 and the projection of the insulating member 14 can be exactly adjacent or separated. The main body portion 41 does not extend into the space between the current collecting member 30 and the insulating member 14 to occupy the space between the current collecting member 30 and the insulating member 14.

[0101] In the embodiment of the present application, by providing a thinning portion 42 with a relatively thin thickness on the spacer 40 and only making at least part of the thinning portion 42 located between the current collecting member 30 and the insulating member 14, the space occupied by the thinning portion 42 in the thickness direction X is reduced. The thinning portion 42 can block welding particles and will not affect the welding of the current collecting member 30 and the electrode terminal 13 due to excessive thickness, which is beneficial to improving the welding effect of the current collecting member 30 and the electrode terminal 13. Moreover, the thickness of the main body portion 41 is greater than that of the thinning portion 42, and the structural strength of the main body portion 41 is relatively large, reducing the possibility of deformation of the spacer 40.

[0102] In some embodiments, referring to Figure 5 , the main body portion 41 includes a first sub-portion 411 and a second sub-portion 412. The second sub-portion 412 is connected between the first sub-portion 411 and the thinning portion 42, and the second sub-portion 412 protrudes from the surface of the first sub-portion 411 facing away from the wall portion 111 in a direction away from the wall portion 111.

[0103] The first sub-portion 411 can be a flat plate body. The first sub-portion 411 can be attached to the wall portion 111 or can be spaced from the wall portion 111.

[0104] The second sub-portion 412 can be an annular structure surrounding the insulating member 14. In a direction perpendicular to the thickness direction X, the second sub-portion 412 is spaced from the insulating member 14 to facilitate absorbing the assembly tolerance between the spacer 40 and the insulating member 14, reducing interference phenomena, and being beneficial to improving the assembly efficiency.

[0105] The second sub-portion 412 is smoothly connected to the first sub-portion 411, and the second sub-portion 412 is smoothly connected to the thinning portion 42. Exemplarily, at least part of the cross-section of the second sub-portion 412 taken along the thickness direction X can be in an S shape.

[0106] In the embodiment of the present application, the protruding and bending of the second sub-portion 412 relative to the first sub-portion 411 can raise the thinning portion 42 outwardly from the wall portion 111, facilitating at least part of the thinning portion 42 to be located between the current collecting member 30 and the insulating member 14. At the same time, a certain concave space can be formed on the side of the first sub-portion 411 facing away from the wall portion 111, and this concave space can accommodate or avoid structures such as the pressure strip in the box body 20, which is beneficial to improving the space utilization rate in the box body 20 and the installation stability of the battery cell 10.

[0107] Figure 7 is a partial cross-sectional structural schematic diagram of a battery device provided in another embodiment of the present application. In another embodiment, referring to Figure 7, the main body portion 41 includes a third sub-portion 413 and a fourth sub-portion 414. The fourth sub-portion 414 is connected between the third sub-portion 413 and the thinning portion 42. The fourth sub-portion 414 is recessed from the surface of the third sub-portion 413 facing away from the wall portion 111 in a direction close to the wall portion 111.

[0108] The third sub-portion 413 can be a flat plate body. The third sub-portion 413 is spaced apart from the wall portion 111.

[0109] The fourth sub-portion 414 can be an annular structure surrounding the insulating member 14. In a direction perpendicular to the thickness direction X, the fourth sub-portion 414 is spaced apart from the insulating member 14 to facilitate absorbing the assembly tolerance between the spacer 40 and the insulating member 14, reducing the interference phenomenon, and being beneficial to improving the assembly efficiency.

[0110] The fourth sub-portion 414 is smoothly connected to the third sub-portion 413, and the fourth sub-portion 414 is smoothly connected to the thinning portion 42. Exemplarily, at least a part of the cross-section of the fourth sub-portion 414 taken along the thickness direction X can be S-shaped.

[0111] The fourth sub-portion 414 and the thinning portion 42 can form a recess recessed from the third sub-portion 413 in a direction close to the wall portion 111. A part of the fourth sub-portion 414 forms the side wall of the recess, and another part of the fourth sub-portion 414 and the thinning portion 42 form the bottom wall of the recess.

[0112] In the embodiment of the present application, the recess of the fourth sub-portion 414 relative to the third sub-portion 413 can increase the interval between the third sub-portion 413 and the wall portion 111, reduce the possibility that the third sub-portion 413 presses against the wall portion 111 in a direction close to the electrode assembly 12, and reduce the adverse effect on the welding effect between the current collecting member 30 and the electrode terminal 13.

[0113] In some embodiments, referring to Figure 7 , the fourth sub-portion 414 and the thinning portion 42 enclose a recess space 44, and at least a part of the current collecting member 30 is disposed in the recess space 44.

[0114] The recess space 44 can be configured to be similar to the current collecting member 30, and the shape of the recess space 44 matches the shape of at least a part of the current collecting member 30 to improve the stability of the current collecting member 30 in the recess space 44 and facilitate the connection between the current collecting member 30 and the spacer 40.

[0115] In one example, in a direction away from the wall portion 111, the current collecting member 30 does not extend beyond the third sub-portion 413, and the entire current collecting member 30 is located in the recess space 44.

[0116] In another example, in a direction away from the wall portion 111, the current collecting member 30 extends beyond the third sub-portion 413, and a part of the current collecting member 30 is located outside the recess space 44.

[0117] In the embodiment of the present application, at least a part of the busbar component 30 is disposed in the concave space 44, and at least a part of the space in the thickness direction X can be shared by the busbar component 30 and the separator 40, so that the structural layout is more compact, which is beneficial to improving the space utilization rate in the box body 20 and the energy density of the battery device 100.

[0118] In some embodiments, referring to Figure 5 and Figure 7 , the thickness of the thinning portion 42 is less than the dimension by which the electrode terminal 13 exceeds the insulating member 14 along the thickness direction X of the wall portion 111.

[0119] The dimension by which the electrode terminal 13 exceeds the insulating member 14 can be the spacing distance between the busbar component 30 and the insulating member 14 in the thickness direction X, and this spacing distance is greater than the thickness of the thinning portion 42. The portion of the thinning portion 42 located between the busbar component 30 and the insulating member 14 will not squeeze the busbar component 30 and the insulating member 14 in the thickness direction X, and will not affect the welding effect between the busbar component 30 and the electrode terminal 13.

[0120] In some embodiments, referring to Figure 5 and Figure 7 , along the thickness direction X of the wall portion 111, the thinning portion 42 and the insulating member 14 are spaced apart.

[0121] The surface of the thinning portion 42 facing the busbar component 30 can be flush with at least a part of the surface of the main body portion 41 facing away from the busbar component 30. The surface of the thinning portion 42 facing the busbar component 30 and at least a part of the surface of the main body portion 41 facing away from the busbar component 30 are both attached to the busbar component 30, so as to increase the contact area between the separator 40 and the busbar component 30, which is beneficial to improving the connection reliability and stability between the two.

[0122] The surface of the thinning portion 42 facing away from the busbar component 30 is closer to the busbar component 30 than at least a part of the surface of the main body portion 41 facing away from the busbar component 30. A relief recess can be formed on the side of the thinning portion 42 facing away from the busbar component 30, and this relief recess can avoid the insulating member 14, so that the thinning portion 42 is spaced apart from the insulating member 14.

[0123] In the embodiment of the present application, the thinning portion 42 and the insulating member 14 are spaced apart, and the thinning portion 42 will not exert a force on the insulating member 14 in the thickness direction X, will not squeeze the insulating member 14 in the direction away from the busbar component 30, and will not affect the welding effect between the busbar component 30 and the electrode terminal 13.

[0124] In some embodiments, referring to Figure 5 and Figure 6, the spacer 40 is provided with an avoidance hole 43 that penetrates through the thinning portion 42. A part of the electrode terminal 13 is exposed on the side of the spacer 40 facing the bus bar component 30 through the avoidance hole 43 and is connected to the bus bar component 30.

[0125] The portion of the electrode terminal 13 that extends beyond the insulating member 14 can be exposed on the side of the spacer 40 facing the bus bar component 30 through the avoidance hole 43.

[0126] Along the thickness direction X, the surface of the electrode terminal 13 facing away from the electrode assembly 12 is connected to the bus bar component 30.

[0127] The avoidance hole 43 penetrates through the thinning portion 42 along the thickness direction X. The thinning portion 42 can surround the avoidance hole 43, and welding particles can be blocked by the thinning portion 42 at any position in the circumferential direction of the electrode terminal 13, which is beneficial to further reducing the short - circuit risk and improving the reliability.

[0128] In some embodiments, along the thickness direction X, the projection of the portion of the electrode terminal 13 that extends beyond the insulating member 14 is located within the projection of the avoidance hole 43, and the projection of the insulating member 14 and the projection of the spacer 40 partially overlap.

[0129] Along the thickness direction X, the spacer 40 only shields a part of the insulating member 14. Along the direction perpendicular to the thickness direction X, the electrode terminal 13 and the hole wall of the avoidance hole 43 are spaced apart. A gap can be formed between the portion of the electrode terminal 13 that extends beyond the insulating member 14 and the hole wall of the avoidance hole 43. Through this gap, the assembly tolerance between the spacer 40 and the electrode terminal 13 can be absorbed, reducing the interference phenomenon, which is beneficial to improving the assembly efficiency.

[0130] In some embodiments, referring to Figure 5 and Figure 7 , along the thickness direction X of the wall portion 111, the spacer 40 is spaced apart from the wall portion 111.

[0131] Along the thickness direction X, the surface of the spacer 40 facing the wall portion 111 and the surface of the wall portion 111 facing the spacer 40 are spaced apart. When the bus bar component 30 and the electrode terminal 13 are connected, the spacer 40 will not squeeze the wall portion 111 in the direction away from the bus bar component 30, and will not affect the welding effect between the bus bar component 30 and the electrode terminal 13.

[0132] In some embodiments, referring to Figure 3 and Figure 4 , the housing 11 includes a housing body 11a and an end cover 11b. The housing body 11a has an opening 11a1, and the end cover 11b covers the opening 11a1. The wall portion 111 is the end cover 11b.

[0133] Exemplarily, one side of the housing body 11a along the thickness direction X has an opening 11a1, and the end cover 11b covers the opening 11a1.

[0134] As another example, both sides of the housing 11a in the thickness direction X have openings 11a1, the number of end caps 11b is two, the two end caps 11b are respectively closed on the two openings 11a1, and the wall portion 111 is one of the end caps 11b.

[0135] According to the second aspect of the present application, an electrical device is further provided in an embodiment of the present application. The electrical device includes the battery device 100 provided in any embodiment of the present application, and the battery device 100 is used to provide electrical energy.

[0136] An embodiment of the present application provides a battery device 100. The battery device 100 includes battery cells 10, a current collecting component 30, and a separator 40. The battery cell 10 includes a housing 11, an electrode assembly 12, an electrode terminal 13, and an insulating member 14. The electrode assembly 12 is disposed in the housing 11. The housing 11 includes an end cap 11b. The electrode terminal 13 is disposed on the end cap 11b. The insulating member 14 is connected to the end cap 11b. The insulating member 14 at least partially surrounds the electrode terminal 13 and is fixed to the electrode terminal 13. The electrode terminal 13 is connected to the electrode assembly 12, and the electrode terminal 13 extends beyond the insulating member 14 in a direction away from the electrode assembly 12. At least a part of the current collecting component 30 is located on a side of the electrode terminal 13 away from the electrode assembly 12 and is connected to the electrode terminal 13. The separator 40 is disposed on a side of the end cap 11b away from the electrode assembly 12, and includes a main body portion 41 and a thinning portion 42. The thinning portion 42 is provided with an avoidance hole 43 for avoiding the electrode terminal 13, and the thickness of the thinning portion 42 is less than the thickness of the main body portion 41. At least a part of the thinning portion 42 is located between the current collecting component 30 and the insulating member 14 to locally cover the insulating member 14 in the thickness direction X of the end cap 11b.

[0137] The battery device 100 provided in the embodiment of the present application can locally cover the insulating member 14 through the thinning portion 42 of the separator 40, which can not only prevent welding particles from falling between the end cap 11b and the separator 40 and integrate the top chip function, but also will not affect the welding between the electrode terminal 13 and the current collecting component 30 due to the excessive thickness of the thinning portion 42. At the same time, the structural strength of the entire separator 40 can be ensured through the main body portion 41.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: A battery cell, including a housing, an electrode assembly, an electrode terminal, and an insulating member. The electrode assembly is disposed within the housing. The housing includes a wall portion. The electrode terminal is disposed on the wall portion. The insulating member is connected to the wall portion. The insulating member at least partially surrounds the electrode terminal and is fixed to the electrode terminal. The electrode terminal is connected to the electrode assembly, and the electrode terminal extends beyond the insulating member in a direction away from the electrode assembly; A current collecting member, at least a part of the current collecting member is located on a side of the electrode terminal away from the electrode assembly and is connected to the electrode terminal; And An isolation member, disposed on a side of the wall portion facing away from the electrode assembly, at least a part of the isolation member is located between the current collecting member and the insulating member.

2. The battery device according to claim 1, wherein A portion of the electrode terminal extending beyond the insulating member is spaced apart from the isolation member in a direction perpendicular to the thickness direction of the wall portion.

3. The battery device according to claim 1, wherein The isolation member includes a main body portion and a thinning portion. The main body portion surrounds the thinning portion, and the thickness of the thinning portion is less than the thickness of the main body portion; At least a part of the thinning portion is located between the current collecting member and the insulating member. In the thickness direction of the wall portion, the projection of the main body portion and the projection of the insulating member do not overlap.

4. The battery device according to claim 3, wherein The main body portion includes a first sub-portion and a second sub-portion. The second sub-portion is connected between the first sub-portion and the thinning portion, and the second sub-portion protrudes from a surface of the first sub-portion facing away from the wall portion in a direction away from the wall portion.

5. The battery device according to claim 3, wherein The main body portion includes a third sub-portion and a fourth sub-portion. The fourth sub-portion is connected between the third sub-portion and the thinning portion, and the fourth sub-portion is recessed from a surface of the third sub-portion facing away from the wall portion in a direction close to the wall portion.

6. The battery device according to claim 5, wherein The fourth sub-portion and the thinning portion enclose a concave space, and at least a part of the current collecting member is disposed within the concave space.

7. The battery device according to claim 3, wherein The thickness of the thinning portion is less than the dimension of the electrode terminal extending beyond the insulating member in the thickness direction of the wall portion.

8. The battery device according to claim 3, wherein In the thickness direction of the wall portion, the thinning portion is spaced apart from the insulating member.

9. The battery device according to claim 3, wherein The isolation member is provided with an avoidance hole that penetrates the thinning portion; A part of the electrode terminal is exposed on a side of the isolation member facing the current collecting member through the avoidance hole and is connected to the current collecting member.

10. The battery device according to claim 9, wherein In the thickness direction of the wall portion, the projection of the portion of the electrode terminal extending beyond the insulating member is located within the projection of the avoidance hole, and the projection of the insulating member and the projection of the isolation member partially overlap.

11. The battery device according to claim 1, wherein along the thickness direction of the wall portion, the separator is disposed at an interval from the wall portion.

12. The battery device according to claim 1, wherein the outer casing includes a housing and an end cap, the housing has an opening, and the end cap covers the opening; the wall portion is the end cap.

13. An electrical device, characterized in that, Comprising the battery device according to any one of claims 1-12, the battery device is used for providing electric energy.

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