Battery apparatus and electrical apparatus

Abstract

Disclosed in embodiments of the present application are a battery apparatus and an electrical apparatus. The battery apparatus comprises: a box body, the box body comprising: a first box body wall; multiple battery cells, the multiple battery cells being accommodated in the box body, a first housing wall of each battery cell being provided with an electrode terminal, and the first housing walls facing the first box body wall; multiple bus components, which are used for electrically connecting the multiple battery cells, the multiple bus components comprising a first bus component, the first bus component comprising a connecting portion and a fusing portion, the connecting portion being used for electrically connecting electrode terminals of the multiple battery cells, and at least part of the surface of the first bus component being disposed opposite to the first box body wall; and an insulating member, the insulating member being at least partially located between the first bus component and the first box body wall, and at least covering the surface of the fusing portion facing the first box body wall. The battery apparatus and the electrical apparatus in the embodiments of the present application can improve the stability and reliability of the battery apparatus.

Description

Battery device and electric device TECHNICAL FIELD

[0001] The present application relates to the field of battery, more particularly, to a battery device and an electric device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for its development. In the rapid development of battery technology, how to improve the safety performance of the battery device is an urgent technical problem in the battery technology.

[0003] SUMMARY

[0004] The embodiments of the present application provide a battery device and an electric device, which can improve the stability and reliability of the battery device.

[0005] In a first aspect, a battery device is provided, comprising: a box body comprising a first box body wall; a plurality of battery monomers accommodated in the box body, a first shell wall of the battery monomers being provided with an electrode terminal, the first shell wall facing the first box body wall; a plurality of busbar components for electrically connecting the plurality of battery monomers, the plurality of busbar components comprising a first busbar component, the first busbar component comprising a connecting portion for electrically connecting the electrode terminals of the plurality of battery monomers and a fuse portion, at least part of a surface of the first busbar component being arranged opposite to the first box body wall; and an insulating member at least partially located between the first busbar component and the first box body wall and covering at least a surface of the fuse portion facing the first box body wall.

[0006] Therefore, the battery device of the embodiments of the present application, by arranging the insulating member, in the case of fuse of the fuse portion, the insulating member can be used to block the melt generated when the fuse portion is fused, reduce the melt splashing to the first box body wall, reduce the risk of the first box body wall being punched, and also reduce the generation of secondary short circuit loop in the battery device, improve the stability and reliability of the battery device.

[0007] In some embodiments, the insulating member comprises a first portion and a second portion connected together, the first portion being used to cover at least part of a surface of the connecting portion facing the first box body wall, and the second portion being used to cover a surface of the fuse portion facing the first box body wall; the size of the first portion is different from the size of the second portion, and / or the material of the first portion is different from the material of the second portion. Considering that high-temperature melt will be generated when the fuse portion is fused, by arranging the first portion and the second portion to be different in size and / or material, the second portion can better block the splashing of the melt, improving the reliability of the battery device.

[0008] In some embodiments, the first portion has a thickness smaller than that of the second portion, and / or the first portion has a melting point of the material smaller than that of the second portion. By increasing the thickness of the second portion, the structural strength of the second portion can be improved; by increasing the melting point of the second portion, the temperature resistance of the second portion can be improved. In the case that the fuse portion is fused, the second portion with a larger thickness or a higher melting point can effectively block the splashing of the molten material, protect the first case wall, reduce the risk of the first case wall being punched through by the molten material, and improve the reliability of the battery device.

[0009] In some embodiments, the thickness T2 of the second portion and the melting point P2 of the material of the second portion satisfy one of the following conditions: P2≤300℃ and T2≥0.1mm; or, 300℃≤P2≤500℃ and T2≥0.07mm; or, P2≥500℃ and T2≥0.5mm. For the second portion, the lower the temperature resistance of the material, the thicker the thickness needs to be set to resist the impact of high-temperature molten material, so as to meet the design requirements; on the contrary, if the temperature resistance of the material of the second portion is higher, the thickness can be reduced to reduce the weight and volume of the second portion, so as to improve the energy density of the battery device.

[0010] In some embodiments, along the width direction of the first bus member, the size of the second portion is greater than that of the first portion, so as to increase the area of the surface of the second portion covering the fuse portion, so that the second portion can more effectively block the splashing of the molten material generated by the fuse portion, so as to protect the first case wall.

[0011] In some embodiments, the battery device further comprises a fixing member for limiting the first shell wall and located on the side of the first shell wall facing the first case wall, and the insulating member further comprises a third portion at least partially located between the first bus member and the fixing member and covering at least the surface of the fuse portion facing the fixing member. The fixing member attached to the side of the first shell wall facing the first case wall can be used to compress and fix the battery monomer, so as to improve the stability of the battery monomer in the case. The third portion of the insulating member between the fixing member and the fuse portion of the first bus member can be used to block the molten material generated when the fuse portion is fused, reduce the molten material splashing to the fixing member, reduce the risk of the fixing member being damaged, and also reduce the generation of secondary short circuit loops in the battery device, so as to improve the stability and reliability of the battery device.

[0012] In some embodiments, the third portion includes a first region and a second region, the first region is located between the first shell wall and the fixing member, and the second region is located between the melting portion and the fixing member. The second region is configured to block the molten material generated by the melting portion from damaging the fixing member. The first region is configured to fix the insulating member to the first shell wall, thereby improving the stability of the insulating member and the insulation reliability between the first shell wall and the fixing member.

[0013] In some embodiments, the third portion is connected to the second portion or is an integral structure with the second portion, thereby simplifying the structure of the insulating member.

[0014] In some embodiments, the third portion further includes a third region opposite to the second region, the third region is located between the first busbar member and the first box wall, and the third region is stacked along the thickness direction of the second portion. The third region is stacked with the second portion and is fixed opposite to the second portion, thereby achieving the relative fixation between the third portion and the second portion. In addition, the third region is configured to block the molten material generated by the melting portion from splashing.

[0015] In some embodiments, along the width direction of the first busbar member, the size of the portion of the third region covering the first busbar member is greater than or equal to 5 mm. The size of the region stacked between the second portion and the third region is increased, thereby reducing the risk of the molten material across the intersection between the second portion and the third region in the case of melting of the melting portion, and further reducing the risk of the molten material penetrating the first box wall, thereby improving the reliability of the battery device.

[0016] In some embodiments, the third region includes a main region and an extension region connected to the main region, the extension region covers at least part of the surface of the melting portion facing the first box wall, and along the width direction of the first busbar member, the size of the extension region is greater than the size of the main region. The third region is configured to cover more regions of the melting portion by setting the extension region, thereby better blocking the molten material generated by the melting portion from splashing.

[0017] In some embodiments, the third region is located between the second portion and the first busbar member, thereby facilitating the clamping fixation of the third region by the second portion and the first busbar member, and improving the reliability and stability of the insulating member.

[0018] In some embodiments, the third region is connected to the second portion or is an integral structure with the second portion, thereby simplifying the structure of the insulating member, facilitating the processing and assembly.

[0019] In some embodiments, the material of the second portion comprises polyimide and / or ceramic silicone rubber; and / or the material of the third portion comprises polyimide and / or ceramic silicone rubber. Both PI and ceramic silicone rubber can meet the design requirements such as temperature resistance, and are easy to process.

[0020] In some embodiments, the plurality of battery cells are arranged in a column along a first direction, the battery device comprises at least two columns of the battery cells arranged along a second direction; the fixing member extends along the first direction and connects the box; wherein the fixing member limits the first shell wall of one column of the battery cells; or the fixing member is located adjacent to two columns of the battery cells, and limits the first shell wall of the two columns of the battery cells. By arranging the same fixing member attached to the first shell wall of the plurality of battery cells, the plurality of battery cells are fixed at the same time, the number of fixing members is reduced, and installation is facilitated.

[0021] In some embodiments, a beam is arranged in the box, the beam is located between the second walls of two columns of the battery cells arranged along the second direction, the first shell wall intersects the second wall, the fixing member is located on the side of the beam facing the first box wall, and the fixing member is an integral structure with the beam, and the fixing member limits the first shell wall of the two columns of the battery cells. The beam in the box can be used to divide the space inside the box into multiple subspaces for accommodating the battery cells, thereby improving the stability of the battery cells inside the box. Arranging the fixing member and the beam as an integral structure can simplify the structure and facilitate installation.

[0022] In some embodiments, the distance between the surface of the first current-collecting component facing the fixing member and the fixing member is less than or equal to 30 mm; and / or the fixing member is at least partially metallic. Reducing the distance D between the first current-collecting component and the fixing member also reduces the distance between the melting portion and the fixing member, which can increase the area of contact between the fixing member and the first shell wall, improve the fixing effect of the fixing member on the battery cells, and increase the space utilization rate in the box of the battery device and the energy density of the battery device. However, in the case of reducing the distance D between the first current-collecting component and the fixing member, if at least part of the fixing member is metallic, it will increase the risk of the fixing member being impacted by the melting point of the melting portion. Therefore, by arranging the insulating member to cover the melting portion, the molten metal can be effectively blocked from splashing, the risk of short circuit caused by the impact of the fixing member can be reduced, and the reliability of the battery device can be improved.

[0023] In some embodiments, the distance between the surface of the melting portion facing the first box wall and the first box wall is less than or equal to 30 mm. Reducing the distance between the melting portion and the first box wall, i.e., reducing the distance between the first current-collecting component and the first box wall, can increase the space utilization rate in the box of the battery device and the energy density of the battery device.

[0024] In some embodiments, the first busbar component includes a plurality of the connection portions, the plurality of the connection portions include a first connection portion and a second connection portion, the first connection portion is configured to electrically connect with a first electrode terminal of a first battery cell, the second connection portion is configured to electrically connect with a second electrode terminal of a second battery cell, and the fuse portion is located between the first connection portion and the second connection portion. Through the first busbar component, electrical connection between two adjacent battery cells can be achieved, and when the fuse portion between the two connection portions is fused, the electrical connection between the two adjacent battery cells can be disconnected, thus the structure is simple and easy to implement.

[0025] In some embodiments, the battery device includes a plurality of busbar components arranged along a first direction, the insulating member extends along the first direction and covers surfaces of the plurality of busbar components facing the first box wall, and the plurality of busbar components includes at least one first busbar component, and the insulating member covers the fuse portion of the at least one first busbar component. Through the insulating member, the plurality of busbar components arranged along the first direction can be covered, thereby reducing the number of insulating members and facilitating assembly of the battery device.

[0026] In some embodiments, the first shell wall is provided with a pressure relief mechanism, and when the pressure relief mechanism is actuated, the fuse portion located near the pressure relief mechanism can be fused in time to disconnect the high-voltage connection, thereby reducing the risk of short circuit between battery cells and improving the reliability of the battery device.

[0027] In a second aspect, a power consuming device is provided, which includes the battery device of the first aspect or any one of the embodiments of the first aspect, and the battery device is configured to store or provide electric energy.

[0028] In some embodiments, the power consuming device is a vehicle, a ship or a spacecraft. BRIEF DESCRIPTION OF DRAWINGS

[0029] FIG. 1 is a schematic view of a vehicle according to an embodiment of the present application;

[0030] FIG. 2 is an exploded structural schematic view of a battery device according to an embodiment of the present application;

[0031] FIG. 3 is a partial structural schematic view of an insulating member according to an embodiment of the present application;

[0032] FIG. 4 is a structural schematic view of a first busbar component according to an embodiment of the present application;

[0033] FIG. 5 is a cross-sectional structural schematic view of a battery device according to an embodiment of the present application;

[0034] FIG. 6 is an enlarged partial cross-sectional structural schematic view of a battery device according to an embodiment of the present application;

[0035] Fig. 7 is an exploded structural schematic view of a battery device according to another embodiment of the present application;

[0036] Fig. 8 is a partially exploded structural enlarged schematic view of a battery device according to another embodiment of the present application;

[0037] Fig. 9 is a top view schematic view of a partial structure of a battery device according to another embodiment of the present application;

[0038] Fig. 10 is a top view enlarged schematic view of a partial structure of a battery device according to another embodiment of the present application;

[0039] Fig. 11 is a cross-sectional structural schematic view of a battery device according to another embodiment of the present application;

[0040] Fig. 12 is a partially cross-sectional structural enlarged schematic view of a battery device according to another embodiment of the present application;

[0041] Fig. 13 is a cross-sectional structural schematic view of a battery device according to another embodiment of the present application;

[0042] Fig. 14 is a partially cross-sectional structural enlarged schematic view of a battery device according to another embodiment of the present application;

[0043] Fig. 15 is a partially cross-sectional structural enlarged schematic view of a battery device according to another embodiment of the present application;

[0044] Fig. 16 is an exploded structural schematic view of a battery device according to another embodiment of the present application;

[0045] Fig. 17 is a partially exploded structural enlarged schematic view of a battery device according to another embodiment of the present application;

[0046] Fig. 18 is a partially exploded structural enlarged schematic view of a battery device according to another embodiment of the present application;

[0047] Fig. 19 is a top view schematic view of a partial structure of a battery device according to another embodiment of the present application;

[0048] Fig. 20 is a top view enlarged schematic view of a partial structure of a battery device according to another embodiment of the present application.

[0049] In the drawings, the drawings are not drawn according to the actual proportions. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0051] 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.

[0052] 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 present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the description of the present application and the claims and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description of the present application and the claims or the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0053] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments 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 embodiments, nor is it necessarily mutually exclusive or alternative embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0054] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be 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.

[0055] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after it.

[0056] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0057] In the present application, "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0058] If not specifically stated, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0059] If not specifically stated, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0060] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0061] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited in this regard.

[0062] 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.

[0063] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells.

[0064] As an example, the battery cell assembly can be a battery module 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.

[0065] In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box.

[0066] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the case by fixing the battery module in the case.

[0067] As an example, the battery cell assembly can also be accommodated in the case by fixing a plurality of battery cells directly to the case.

[0068] As an example, the case can include a first case and a second case. The first case and the second case are fastened so that an enclosed space is formed inside the case to accommodate the battery cell assembly. Here, the enclosed means covered or closed, which can be sealed or unsealed. The first case can be a top cover or a bottom plate.

[0069] As an example, the case can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected to the frame, respectively, so that an enclosed space is formed inside the case to accommodate the battery cell assembly.

[0070] In some embodiments, the case can be part of the chassis structure of a vehicle. For example, part of the case can be at least part of the floor of the vehicle, or part of the case can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0071] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0072] The plurality of battery cells in the battery device are usually connected in series, parallel, or mixed connection through the busbar components. Among them, at least one busbar component in the battery device is provided with a fuse part to timely disconnect the high-voltage connection between the battery cells when a short circuit or thermal runaway fault occurs in the battery device. However, when the fuse part is fused, the high-temperature melt generated at the moment of fusion is easy to impact the components near the fuse part, for example, the melt can impact the nearby case wall, causing the case wall to be punched through, and also causing the appearance of a secondary short circuit loop, affecting the safety of the battery device.

[0073] Therefore, the battery device and the electric device provided by the embodiments of the present application can solve the above problems. The battery device provided by the embodiments of the present application comprises a box body, a plurality of battery monomers, a plurality of bus components and an insulating piece. The box body is used for accommodating the plurality of battery monomers, and the box body comprises a first box body wall. A first shell wall of the battery monomer is provided with an electrode terminal, and the first shell wall faces the first box body wall. The plurality of bus components are used for electrically connecting the plurality of battery monomers, and the plurality of bus components comprise a first bus component. The first bus component comprises a connecting portion and a fusing portion. The connecting portion is used for connecting the electrode terminals of the plurality of battery monomers to realize electrical connection between the plurality of battery monomers. At least part of a surface of the first bus component is arranged opposite to the first box body wall. The insulating piece is at least partially located between the first bus component and the first box body wall, and at least covers a surface of the fusing portion facing the first box body wall. In this way, in the case that the fusing portion is fused, the insulating piece can be used to block the melt generated when the fusing portion is fused, reduce the melt splashing to the first box body wall, reduce the risk of the first box body wall being punched, and also reduce the generation of a secondary short circuit loop in the battery device, thereby improving the stability and reliability of the battery device.

[0074] The technical solutions described in the embodiments of the present application are applicable to various electric devices using the battery device. The following embodiments are described by taking a vehicle as an example for convenience of description.

[0075] For example, as shown in FIG. 1, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel automobile, a gas automobile or a new energy automobile. The new energy automobile can be a pure electric vehicle, a hybrid vehicle or a range extended vehicle. The vehicle 1 can be provided with a motor 40, a controller 30 and a battery device 10 inside. The controller 30 is used to control the power supply of the battery device 10 to the motor 40. For example, the battery device 10 can be arranged at the bottom, the front or the rear of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1. For example, the battery device 10 can be used as an operating power source of the vehicle 1, and is used for the circuit system of the vehicle 1, for example, for the power demand of the vehicle 1 during starting, navigation and operation. In another embodiment of the present application, the battery device 10 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0076] Figure 2 shows an exploded structural schematic diagram of the battery device according to the embodiments of the present application. As shown in Figure 2, the battery device 10 according to the embodiments of the present application comprises a box 11, a plurality of battery cells 20, a plurality of busbar components 12 and an insulating member 13. Figure 3 shows a partial structural schematic diagram of the insulating member 13 according to the embodiments of the present application, for example, Figure 3 shows the insulating member 13 in the area A shown in Figure 2; Figure 4 shows a structural schematic diagram of a first busbar component 120 of the plurality of busbar components 12 according to the embodiments of the present application, for example, the first busbar component 120 shown in Figure 4 can be any one of the busbar components 12 shown in Figure 2.

[0077] In the embodiments of the present application, the box 11 comprises a first box wall 113; the plurality of battery cells 20 are accommodated in the box 11, the first shell wall 201 of the battery cell 20 is provided with an electrode terminal 202, and the first shell wall 201 faces the first box wall 113; the plurality of busbar components 12 are used to electrically connect the plurality of battery cells 20, and the plurality of busbar components 12 comprise a first busbar component 120, the first busbar component 120 comprises a connecting portion 121 and a fuse portion 122, the connecting portion 121 is used to electrically connect the electrode terminals 202 of the plurality of battery cells 20; at least part of the surface of the first busbar component 120 is arranged opposite to the first box wall 113; the insulating member 13 is at least partially located between the first busbar component 120 and the first box wall 113, and at least covers the surface of the fuse portion 122 facing the first box wall 113.

[0078] The battery device 10 according to the embodiments of the present application can comprise a plurality of battery cells 20 to meet different power requirements. The shape of the battery cell 20 according to the embodiments of the present application can be set according to actual application. For example, the battery cell 20 can be a cuboid as shown in Figure 2, or can be a cylinder or other shape different from that shown in Figure 2, and the embodiments of the present application are not limited thereto.

[0079] It should be understood that, as shown in FIG. 2, the battery device 10 of the embodiments of the present application can also include a box 11, which can be used to accommodate a plurality of battery monomers 20. The box 11 of the embodiments of the present application is a hollow structure inside, and a plurality of battery monomers 20 are accommodated in the box 11. The box 11 can include two parts, which are referred to as the first box part 111 and the second box part 112 herein, and the first box part 111 and the second box part 112 are buckled together. The shape of the first box part 111 and the second box part 112 can be determined according to the shape of the components accommodated inside, for example, according to the shape of the combination of a plurality of battery monomers 20, at least one of the first box part 111 and the second box part 112 has an opening. For example, as shown in FIG. 2, only one of the first box part 111 and the second box part 112 can also be a hollow cuboid with an opening, and the other can be a plate-shaped to cover the opening. Taking the example that the second box part 112 is a hollow cuboid with an opening and the first box part 111 is a plate-shaped, the first box part 111 covers the opening of the second box part 112 to form a box 11 with a closed cavity, which can be used to accommodate a plurality of battery monomers 20. A plurality of battery monomers 20 combined in parallel or in series or in a hybrid combination are placed in the box 11 formed by buckling the first box part 111 and the second box part 112.

[0080] For another example, unlike that shown in FIG. 2, the first box part 111 and the second box part 112 can both be hollow cuboids and each have a face as an opening face, the opening of the first box part 111 and the opening of the second box part 112 are oppositely arranged, and the first box part 111 and the second box part 112 are buckled to each other to form a box 11 with a closed cavity, which can be used to accommodate a plurality of battery monomers 20.

[0081] The battery monomer 20 of the embodiments of the present application can include a shell. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. In some embodiments, the shell can be a sealed structure, or can be a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell serves to protect the electrode assembly inside the battery monomer, and a sealing bag is further included between the shell and the electrode assembly, which is used to package the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating piece or an aluminum-plastic film. When the shell is a sealed structure, it is used to package components such as the electrode assembly and the electrolyte.

[0082] As an example, the battery monomer 20 can be a cylindrical battery monomer, a prismatic battery monomer, a soft-pack battery monomer, or other shapes of battery monomers, the prismatic battery monomer includes a square shell battery monomer, a blade-shaped battery monomer, a multi-prismatic battery, for example, a hexagonal prism battery, etc., which is not particularly limited by the present application.

[0083] In some embodiments, the housing includes an end cap and a casing, the casing is provided with an opening, and the end cap covers the opening. The casing can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0084] For ease of illustration, the embodiments of the present application mainly take a cuboid battery device 10 as an example, and the battery device 10 includes a cuboid battery monomer 20. A first shell wall 201 of the battery monomer 20 is provided with an electrode terminal 202, and the first shell wall 201 can be any wall of the battery monomer 20. For example, the first shell wall 201 can be any wall of the casing or any wall of the end cap, and the embodiments of the present application are not limited thereto. The first shell wall 201 faces a first cabinet wall 113 of the cabinet 11, that is, the first shell wall 201 is opposite to the first cabinet wall 113.

[0085] In addition, for the cuboid battery device 10, for ease of description, the embodiments of the present application define three reference directions. The length direction of the battery device 10 is direction X, the width direction of the battery device 10 is direction Y, and the height direction of the battery device 10 is direction Z, wherein the length direction X, the width direction Y and the height direction Z of the battery device 10 are perpendicular to each other, and the width direction Y of the battery device 10 is smaller than the length direction X.

[0086] It should be understood that the electrode terminal 202 of the embodiments of the present application is electrically connected with the tab to output electric energy. For example, the electrode terminal 202 can be directly connected with the tab, or indirectly connected with the tab through a current collecting member.

[0087] The battery device 10 of the embodiments of the present application can include a plurality of busbar components 12, wherein the plurality of busbar components 12 includes a first busbar component 120, and the first busbar component 120 can be any one of the plurality of busbar components 12. As shown in FIGS. 2 to 4, the plurality of busbar components 12 included in the battery device 10 can include one or more first busbar components 120, that is, the plurality of busbar components 12 can include one or more first busbar components 120 provided with a fuse portion 122; the plurality of busbar components 12 can also include one or more busbar components 12 without the fuse portion 122, and the embodiments of the present application are not limited thereto. For example, the drawings of the embodiments of the present application mainly take the battery device 10 including two first busbar components 120 as an example.

[0088] The first busbar component 120 in the embodiments of the present application includes a connecting part 121 and a fuse part 122. The connecting part 121 is used to electrically connect the electrode terminals 202 of at least two battery monomers 20 to realize electrical connection between the at least two battery monomers 20. The fuse part 122 is used to fuse when the temperature exceeds a threshold value, thereby breaking the electrical connection between the at least two battery monomers 20 connected by the first busbar component 120. For example, in the case of failure of the battery monomers 20 inside the battery device 10, the temperature of the fuse part 122 may rise, for example, when the battery monomers 20 are in thermal runaway, or when a short circuit occurs between the battery monomers 20; if the temperature rises to exceed the melting point of the fuse part 122, the fuse part 122 will fuse, thereby causing the battery monomers 20 connected by the first busbar component 120 to be disconnected.

[0089] At least part of the surface of the first busbar component in the embodiments of the present application is arranged opposite to the first box wall 113, and the insulating piece 13 is located between the first busbar component 120 and the first box wall 113, and covers at least the surface of the fuse part 122 facing the first box wall 113. In this way, in the case of fusion of the fuse part 122, the insulating piece 13 covering the surface thereof can be used to block the melt generated when the fuse part 122 fuses, reduce the melt splashing to the first box wall 113, reduce the risk of the first box wall 113 being punched, and also reduce the generation of secondary short circuit loops inside the battery device 10, thereby improving the stability and reliability of the battery device 10.

[0090] It should be understood that the battery monomer 20 in the embodiments of the present application can also be provided with other components. For example, the battery monomer 20 is provided with a pressure relief mechanism 203 for discharging the internal gas of the battery monomer 20.

[0091] As an example, the internal pressure or temperature of the battery monomer 20 reaches a predetermined threshold value to actuate to release the internal pressure or temperature. When the internal pressure or temperature of the battery monomer 20 reaches the predetermined threshold value, the pressure relief mechanism 203 performs an action or a weak structure provided in the pressure relief mechanism 203 is broken, thereby forming an opening or a channel for the internal pressure or temperature to be released. The threshold value is designed differently according to different design requirements. The threshold value can depend on the material of one or more of the positive plate, the negative plate, the electrolyte and the separator in the battery monomer 20.

[0092] It should be understood that the pressure relief mechanism 203 in the embodiments of the present application can be arranged on any one wall of the housing. For example, the first shell wall 201 is provided with the pressure relief mechanism 203, and when the pressure relief mechanism 203 is actuated, the fuse part 122 located near the pressure relief mechanism 203 can be fused in time to break the high-voltage connection, reduce the risk of short circuit between the battery monomers 20, and improve the reliability of the battery device 10.

[0093] As an example, the pressure relief mechanism 203 can be integrally formed with the housing.

[0094] As an example, the pressure relief mechanism 203 can also be separately provided and connected with the housing.

[0095] The "actuation" mentioned in the present application refers to the pressure relief mechanism 203 generating an action or being activated to a certain state, so that the internal pressure and temperature of the battery cell 20 can be released. The action generated by the pressure relief mechanism 203 can include but is not limited to: the components in the pressure relief mechanism 203 moving to form an exhaust passage, at least a part of the pressure relief mechanism 203 breaking, crushing, being torn or opening, etc. When the pressure relief mechanism 203 is actuated, the high-temperature and high-pressure substances in the interior of the battery cell 20 will be discharged outward from the actuated part as exhaust. In this way, the battery cell 20 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0096] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism 203 can be provided as a through hole for discharging the gas in the interior of the battery cell 20.

[0097] The exhaust from the battery cell 20 mentioned in the present application includes but is not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of separators, high-temperature and high-pressure gases generated by reactions, flames, etc.

[0098] FIG. 5 shows a partial cross-sectional view of the battery device 10 in the embodiments of the present application. For example, FIG. 5 can be a cross-sectional view of the battery device 10 shown in FIG. 2, which is perpendicular to the width direction of the battery device 10. FIG. 6 shows a partial cross-sectional view of the battery device 10 in the embodiments of the present application. For example, FIG. 6 shows an enlarged view of the region B in FIG. 5.

[0099] In the embodiments of the present application, the specific structure of the first current-collecting component 120 can be set according to actual application. For example, as shown in FIGS. 2 to 6, the first current-collecting component 120 includes a plurality of connection parts 121, the plurality of connection parts 121 include a first connection part 1211 and a second connection part 1212, the first connection part 1211 is used for electrically connecting with the first electrode terminal 211 of the first battery cell 21, the second connection part 1212 is used for electrically connecting with the second electrode terminal 221 of the second battery cell 22, and a fuse part 122 is located between the first connection part 1211 and the second connection part 1212. Through the first current-collecting component 120, at least the electrical connection between the adjacent two battery cells 20 can be realized, and when the fuse part 122 between the two connection parts 121 is fused, the electrical connection between the adjacent two battery cells 20 can be disconnected, which is simple in structure and easy to realize.

[0100] In some embodiments, the first electrode terminal 211 of the first battery cell 21 and the second electrode terminal 221 of the second battery cell 22 connected by the first connecting part 1211 and the second connecting part 1212 of the first busbar component 120 can have the same polarity or opposite polarity according to different connection requirements. For example, if the first electrode terminal 211 and the second electrode terminal 221 have opposite polarities, the first busbar component 120 can be used to realize series connection between the first battery cell 21 and the second battery cell 22; for another example, if the first electrode terminal 211 and the second electrode terminal 221 have the same polarity, the first busbar component 120 can be used to realize parallel connection between the first battery cell 21 and the second battery cell 22, but the embodiments of the present application are not limited thereto.

[0101] In some embodiments, the first busbar component 120 can be used to realize electrical connection between at least two battery cells 20. For example, the first busbar component 120 can only include two connecting parts 121, and the first busbar component 120 is used to realize electrical connection between two battery cells 20. For another example, the first busbar component 120 can further include four connecting parts 121, and the first busbar component 120 can be further used to realize electrical connection between four battery cells 20, but the embodiments of the present application are not limited thereto.

[0102] In some embodiments, the battery device 10 includes a plurality of busbar components 12 arranged along a first direction, an insulating member 13 extending along the first direction and covering the surface of the plurality of busbar components 12 facing the first box wall 113, and the plurality of busbar components includes at least one first busbar component 120, and the insulating member 13 covers the fusing part 122 of the at least one first busbar component 120. For example, as shown in FIGS. 2 to 6, taking the length direction X of the battery device 10 as the first direction, the plurality of busbar components 12 arranged along the length direction X of the battery device 10 can be covered by the insulating member 13, thereby reducing the number of insulating members 13 and facilitating assembly of the battery device 10. In addition, the plurality of busbar components 12 arranged along the length direction X of the battery device 10 can include at least one first busbar component 120, for example, FIG. 2 includes one first busbar component 120, but the embodiments of the present application are not limited thereto.

[0103] In some embodiments, the number of the busbar components 12 in the battery device 10 can be set according to the number of the battery cells 20, and can also be set according to the connection mode of the plurality of battery cells 20. Among the plurality of busbar components 12 in the battery device 10, there can be at least one first busbar component 120 provided with a fusing portion 122. The number of the first busbar components 120 provided with the fusing portion 122 can be set according to actual application, so as to balance the overcurrent performance of the first busbar component 120 in the battery device 10 and the reliability of the battery device 10. Hereinafter, any one of the first busbar components 120 in the battery device 10 will be taken as an example for description.

[0104] In some embodiments, the distance D1 between the surface of the fusing portion 122 facing the first box wall 113 and the first box wall 113 is less than or equal to 30 mm. Reducing the distance D1 between the fusing portion 122 and the first box wall 113, i.e. reducing the distance between the first busbar component 120 and the first box wall 113, can increase the space utilization in the box 11 of the battery device 10 and improve the energy density of the battery device 10. However, in the case of reducing the distance D1 between the fusing portion 122 and the first box wall 113, the risk of the fusing portion 122 producing a melting point impact on the first box wall 113 when melting will also increase. Therefore, by providing the insulating member 13 to cover the fusing portion 122, the molten metal splashing can be effectively blocked, the risk of the first box wall 113 being impacted is reduced, and the reliability of the battery device 10 is improved.

[0105] Hereinafter, the insulating member 13 of the embodiments of the present application will be described with reference to the accompanying drawings.

[0106] In the embodiments of the present application, the structure of the insulating member 13 can be set according to actual application. For example, the insulating member 13 comprises a first portion 131 and a second portion 132 connected together, the first portion 131 is used to cover at least part of the surface of the connecting portion 121 facing the first box wall 113, and the second portion 132 is used to cover the surface of the fusing portion 122 facing the first box wall 113; the size of the first portion 131 is different from the size of the second portion 132, and / or the material of the first portion 131 is different from the material of the second portion 132. The second portion 132 of the insulating member 13 is used to cover the fusing portion 122, and the first portion 131 is used to cover at least part of the area of the first busbar component 120 other than the fusing portion 122. Considering that high-temperature molten metal will be produced when the fusing portion 122 melts, by setting the size of the first portion 131 to be different from the size of the second portion 132, and / or the material of the first portion 131 to be different from the material of the second portion 132, the second portion 132 can better block the molten metal splashing, and the reliability of the battery device 10 is improved.

[0107] In some embodiments, the material of the first portion 131 can be the same as the material of the second portion 132, and the size of the first portion 131 can be different from the size of the second portion 132, so that the insulation member 13 can be a one-piece structure, facilitating processing.

[0108] In some embodiments, the material of the first portion 131 can also be different from the material of the second portion 132. By setting different materials, the performance of the insulation member 13 can be improved, and the insulation effect can be improved.

[0109] In some embodiments, the thickness T1 of the first portion 131 is less than the thickness T2 of the second portion 132. By increasing the thickness of the second portion 132, the structural strength of the second portion 132 can be improved. In the case of melting of the melting portion 122, the second portion 132 with a larger thickness can effectively block the splashing of the melt, protect the first box wall 113, reduce the risk of the first box wall 113 being punched by the melt, and improve the reliability of the battery device 10.

[0110] In some embodiments, the melting point P1 of the material of the first portion 131 is less than the melting point P2 of the material of the second portion 132. For example, by setting different materials for the first portion 131 and the second portion 132, the melting points of the two portions can be different. In the case of melting of the melting portion 122, the second portion 132 with better temperature resistance is not easily damaged by the high-temperature melt, and the second portion 132 can block the splashing of the melt.

[0111] In some embodiments, the thickness T2 of the second portion 132 and the melting point P2 of the material of the second portion 132 satisfy any one of the following three conditions: P2≤300℃, and T2≥0.1mm; or, 300℃≤P2≤500℃, and T2≥0.07mm; or, P2≥500℃, and T2≥0.5mm. For the second portion 132, the lower the temperature resistance of the material, the thicker the thickness needs to be set to resist the impact of high-temperature melt, thereby meeting the design requirements. Conversely, if the temperature resistance of the material of the second portion 132 is high, the thickness T2 can be reduced to reduce the weight and volume of the second portion 132, thereby improving the energy density of the battery device 10.

[0112] It should be understood that the first portion 131 and the second portion 132 can also be different in other dimensions. FIG. 7 shows another partial structural exploded view of the battery device 10 according to an embodiment of the present application. For example, the insulating member 13 of the battery device 10 shown in FIG. 7 can be different from the insulating member 13 of the battery device 10 shown in FIG. 2. FIG. 8 shows a partial structural view of the battery device 10 according to an embodiment of the present application. For example, FIG. 8 can be a magnified view of region C in FIG. 7. FIG. 9 shows a top view of a partial structure of the battery device 10 according to an embodiment of the present application. For example, FIG. 9 shows a top view of the partial structure of the battery device 10 shown in FIG. 7. FIG. 10 shows another partial structural view of the battery device 10 according to an embodiment of the present application. For example, FIG. 10 can be a magnified view of region D in FIG. 9.

[0113] As shown in FIGS. 7 to 10, along the width direction of the first bus member 120, the size L2 of the second portion 132 is greater than the size L1 of the first portion 131, so as to increase the area of the second portion 132 for covering the surface of the melting portion 122, so that the second portion 132 can more effectively block the splashing of the melt generated by the melting portion 122, so as to protect the first case wall 113. In addition, increasing the size L2 of the second portion 132 can also block the splashing of the melt by the insulating member 13, so as to protect other components in the battery device 10, for example, the first bus member 120 can be provided with a fixing member 14 around it, and increasing the size L2 of the second portion 132 can also block the splashing of the melt to the fixing member 14.

[0114] FIG. 11 shows a partial cross-sectional view of the battery device 10 according to an embodiment of the present application. For example, FIG. 11 shows a possible cross-sectional view of the battery device 10 shown in FIG. 7, which is perpendicular to the length direction X of the battery device 10, i.e., FIG. 11 is a cross-sectional view along the E-E’ direction shown in FIG. 9. FIG. 12 shows a partial cross-sectional view of the battery device 10 according to an embodiment of the present application. For example, FIG. 12 shows a magnified view of region F shown in FIG. 11.

[0115] In some embodiments, the battery device 10 further comprises a fixing member 14 for limiting the first shell wall 201, and the fixing member 14 is located on the side of the first shell wall 201 facing the first box wall 113. The insulating member 13 further comprises a third part 133, and the third part 133 is at least partially located between the first busbar component 120 and the fixing member 14, and covers at least the surface of the fusing part 122 facing the fixing member 14. As shown in FIGS. 7-12, the fixing member 14 is attached to the side of the first shell wall 201 facing the first box wall 113, and can be used to compress and fix the battery cell 20 to improve the stability of the battery cell 20 in the box 11. The third part 133 of the insulating member 13 is provided between the fixing member 14 and the fusing part 122 of the first busbar component 120, and in the case of fusing of the fusing part 122, the third part 133 covering the surface thereof can be used to block the molten metal generated when the fusing part 122 fuses, reduce the molten metal splashing to the fixing member 14, reduce the risk of damage to the fixing member 14, and also reduce the generation of secondary short circuit loops in the battery device 10, thereby improving the stability and reliability of the battery device 10.

[0116] In some embodiments, the plurality of battery cells 20 are arranged in a column along a first direction, and the battery device comprises at least two columns of battery cells 20 arranged along a second direction; the fixing member 14 extends along the first direction and is connected to the box 11; wherein the fixing member 14 limits the first shell wall 201 of a column of battery cells 20; or the fixing member 14 is located at the adjacent positions of two adjacent columns of battery cells 20 and limits the first shell walls 201 of the two columns of battery cells 20. For example, as shown in FIGS. 7-12, taking the first direction as the length direction X of the battery device 10, the plurality of battery cells 20 arranged along the first direction can be attached to the first shell walls 201 of the plurality of battery cells 20 by providing the same fixing member 14, so as to fix the plurality of battery cells 20 at the same time, thereby reducing the number of fixing members 14 and facilitating installation.

[0117] In some embodiments, as shown in FIGS. 7-12, the fixing member 14 can also be used to fix a plurality of columns of battery cells 20 arranged along the second direction, for example, taking the second direction as the width direction of the battery device 10, the fixing member 14 is located at the adjacent positions of two adjacent columns of battery cells 20 and limits the first shell walls 201 of the two columns of battery cells 20, thereby fixing the two columns of battery cells 20 arranged along the second direction by the fixing member 14; further, each column of battery cells 20 can further comprise a plurality of battery cells 20 arranged along the first direction, so as to simplify the structure.

[0118] It should be understood that the fixing member 14 of the embodiments of the present application can be implemented in various structures. For example, as shown in FIGS. 11 and 12, the fixing member 14 of the embodiments of the present application can be in a strip structure, for example, the fixing member 14 can be a pressing strip, which is arranged on the surface of the first shell wall 201 and used to press and fix the battery monomer 20.

[0119] In some embodiments, the fixing member 14 can also be in other structures. FIG. 13 shows another partial cross-sectional view of the battery device 10 of the embodiments of the present application, for example, FIG. 13 shows another possible cross-sectional view of the battery device 10 shown in FIG. 7, which is perpendicular to the length direction X of the battery device 10, that is, FIG. 13 can be a cross-sectional view along the E-E' direction shown in FIG. 9. FIG. 14 shows a partial cross-sectional view of the battery device 10 of the embodiments of the present application, for example, FIG. 14 shows an enlarged view of the region G shown in FIG. 13.

[0120] In some embodiments, the box body 11 is provided with a beam 114, which is located between the second walls 204 of the two rows of battery monomers 20 arranged in the second direction, and the first shell wall 201 intersects the second wall 204. As shown in FIGS. 13 and 14, the beam 114 in the box body 11 can be used to divide the space inside the box body 11 into multiple subspaces for respectively accommodating the battery monomers 20, thereby improving the stability of the battery monomers 20 inside the box body 11. For example, taking the second direction as the width direction Y of the battery device 10, the beam 114 can be located between the two rows of battery monomers 20 arranged in the second direction, and attached to the second walls 204 of the two rows of battery monomers 20.

[0121] In some embodiments, the fixing member 14 is located on the side of the beam 114 facing the first box wall 113 and is in an integrated structure with the beam 114, and the fixing member 14 limits the first shell wall 201 of the two rows of battery monomers 20. As shown in FIGS. 13 and 14, the fixing member 14 can be in an integrated structure with the beam 114, for example, the fixing member 14 can be a protruding structure on the side of the beam 114 facing the first box wall 113, so as to fix the two rows of battery monomers 20 on both sides of the beam 114 through the beam 114 and the fixing member 14, thereby improving the stability of the two rows of battery monomers 20.

[0122] In some embodiments, the distance D2 between the surface of the first busbar component 120 facing the fixing member 14 and the fixing member 14 is less than or equal to 30 mm, and / or the fixing member 14 is at least partially made of metal. Reducing the distance D2 between the first busbar component 120 and the fixing member 14 also reduces the distance between the melting portion 122 and the fixing member 14, which can increase the contact area between the fixing member 14 and the first shell wall 201, and improve the fixing effect of the fixing member 14 on the battery cell 20. In addition, it can also increase the space utilization rate in the box 11 of the battery device 10, and improve the energy density of the battery device 10. However, in the case of reducing the distance D2 between the first busbar component 120 and the fixing member 14, if at least part of the fixing member 14 is made of metal, it will also increase the risk of the fixing member 14 being impacted by the molten metal when the melting portion 122 melts. Therefore, by arranging the insulating member 13 to cover the melting portion 122, the molten metal can be effectively blocked from splashing, the risk of short circuit caused by the impact of the fixing member 14 can be reduced, and the reliability of the battery device 10 can be improved.

[0123] It should be understood that the structure of the third portion 133 between the first busbar component 120 and the fixing member 14 can be set according to actual application. For example, the third portion 133 includes a first region 1331 and a second region 1332, which are relatively bent. The first region 1331 is located between the first shell wall 201 and the fixing member 14, and the second region 1332 is located between the melting portion 122 and the fixing member 14. As shown in FIGS. 7-14, the second region 1332 can be arranged to block the molten metal generated by the melting portion 122 from damaging the fixing member 14. The first region 1331 can be arranged to fix the insulating member 13 to the first shell wall 201, to improve the stability of the insulating member 13, and to improve the insulation reliability between the first shell wall 201 and the fixing member 14.

[0124] In some embodiments, the third portion 133 is connected to the second portion 132, or the third portion 133 and the second portion 132 are an integral structure, to simplify the structure of the insulating member 13. As shown in FIGS. 7-14, the second region 1332 of the third portion 133 can be relatively bent with the second portion 132, so as to block the molten metal generated by the melting portion 122 from impacting the first box wall 113 and the fixing member 14 at the same time through the insulating member 13, to reduce the risk of secondary short circuit loop in the battery device 10, and to improve the stability and reliability of the battery device 10.

[0125] In some embodiments, the third part 133 can also be arranged separately from the second part 132, i.e., the insulating member 13 can also not be an integral structure. FIG. 15 shows another partial cross-sectional view of the battery device 10 according to an embodiment of the application, which can be another possible enlarged view of region G shown in FIG. 13. The difference between FIG. 14 and FIG. 15 is that the third part 133 can be arranged separately from the second part 132 as shown in FIG. 15, so as to flexibly adjust the position and size of the third part 133 according to the position of the fixing member 14, and improve the effect of the insulating member 13 on blocking the splashing of the melt.

[0126] FIG. 16 shows another exploded structural view of the battery device 10 according to an embodiment of the application, and FIG. 17 shows an enlarged view of region H shown in FIG. 16. As shown in FIG. 16 and FIG. 17, in some embodiments, the third part 133 further includes a third region 1333 bent opposite to the second region 1332, the third region 1333 is located between the first busbar component 120 and the first box wall 113, and the third region 1333 is arranged in a stacked manner along the thickness direction of the second part 132. The third region 1333 can be arranged in a stacked manner with the second part 132 and be fixed relative to the second part 132, so as to achieve the relative fixation of the third part 133 and the second part 132, and the third region 1333 can also be used to block the splashing of the melt generated by the fusing portion 122.

[0127] In some embodiments, the third region 1333 is located between the second part 132 and the first busbar component 120, so as to facilitate the clamping fixation of the third region 1333 by the second part 132 and the first busbar component 120, and improve the reliability and stability of the insulating member 13.

[0128] In some embodiments, the third region 1333 is connected with the second part 132, or the third region 1333 and the second part 132 are an integral structure, so as to simplify the structure of the insulating member 13 and facilitate processing and assembly. For example, the third part 133 can be connected with the second part 132 through the third region 1333, or the third part 133 and the second part 132 can be an integral structure through the third region 1333.

[0129] In some embodiments, the third region 1333 includes a main body region 1335 and an extension region 1334 connected with the main body region 1335, the extension region 1334 covers at least part of the surface of the fusing portion 122 facing the first box wall 113, and the size L4 of the extension region 1334 is greater than the size L3 of the main body region 1335 along the width direction of the first busbar component 120. By arranging the extension region 1334, the third region 1333 can cover more areas of the fusing portion 122, and the extension region 1334 can better block the splashing of the melt generated by the fusing portion 122.

[0130] In some embodiments, the third region 1333 can also not be provided with the extension region 1334 of different sizes. For example, FIG. 18 shows another partial schematic view of the battery device 10 according to embodiments of the present application, for example, FIG. 18 shows another possible implementation of the third region 1333 according to embodiments of the present application, and FIG. 18 can replace FIG. 17, that is, FIG. 18 can be another possible enlarged view of the region H shown in FIG. 16. As shown in FIG. 18, the third region 1333 can not be provided with the extension region 1334 of different sizes, that is, the size of the third region 1333 is substantially the same along the width direction of the first bus member 120, so as to simplify the structure of the third portion 133 and facilitate processing.

[0131] FIG. 19 shows a top view of a partial structure of the battery device 10 according to embodiments of the present application, for example, FIG. 19 shows a top view of a partial structure of the battery device 10 shown in FIG. 16. FIG. 20 shows another partial structure view of the battery device 10 according to embodiments of the present application, for example, FIG. 20 can be an enlarged view of the region I in FIG. 19.

[0132] In some embodiments, along the width direction of the first bus member 120, the size L5 of the portion of the third region 1333 covering the first bus member 120 is greater than or equal to 5 mm. For example, as shown in FIG. 19 and FIG. 20, taking the width direction of the first bus member 120 as the width direction Y of the battery device 10, for the portion of the third region 1333 covering the first bus member 120, for example, if the third region 1333 is provided with the extension region 1334, considering that the size of the extension region 1334 is larger, the size L5 of the portion of the main body region 1335 covering the first bus member 120 should be greater than or equal to 5 mm; or, if the third region 1333 is not provided with the extension region 1334, the region of the third region 1333 with the smallest size along the width direction of the first bus member 120 should satisfy that the size of the portion of the region is greater than or equal to 5 mm, so as to increase the size of the region between the second portion 132 and the third region 1333, in the case that the fuse portion 122 is fused, the risk of the melt crossing the intersection region between the second portion 132 and the third region 1333 can be reduced, thereby reducing the risk of the melt punching through the first case wall 113, and improving the reliability of the battery device 10.

[0133] It should be understood that the material of the insulation member 13 according to the embodiments of the present application can be set according to actual application. For example, the first portion 131 and the second portion 132 can be separately provided to adopt different materials, respectively. For another example, if the second portion 132 and the third portion 133 are in an integrated structure, the materials of the second portion 132 and the third portion 133 are generally the same to facilitate processing. For another example, if the second portion 132 and the third portion 133 are separately provided, the materials of the second portion 132 and the third portion 133 can be the same or different.

[0134] For example, the material of the first portion 131 includes polycarbonate (PC), and for example, the first portion 131 can adopt a conventional PC film. For another example, the material of the second portion 132 includes polyimide (PI) and / or ceramic silicone rubber. For another example, the material of the third portion 133 includes PI and / or ceramic silicone rubber. Both PI and ceramic silicone rubber can meet the design requirements such as temperature resistance and facilitate processing.

[0135] According to some embodiments of the present application, the present application further provides a power-using device, which comprises the battery device 10 according to any one of the preceding embodiments, and the battery device 10 is used to provide power for the power-using device.

[0136] The power-using device can be a device or system of any one of the preceding application battery devices 10.

[0137] According to some embodiments of the present application, the present application provides a battery device 10, which comprises: a box body 11, the box body 11 comprising a first box body wall 113; a plurality of battery monomers 20, the plurality of battery monomers 20 being contained in the box body 11, a first shell wall 201 of the battery monomer 20 being provided with an electrode terminal 202, the first shell wall 201 facing the first box body wall 113; a plurality of busbar components 12 for electrically connecting the plurality of battery monomers 20, the plurality of busbar components 12 comprising a first busbar component 120, the first busbar component 120 comprising a connecting portion 121 and a fusing portion 122, the connecting portion 121 being used to electrically connect the electrode terminals 202 of the plurality of battery monomers 20, at least part of a surface of the first busbar component 120 being oppositely arranged with the first box body wall 113; an insulation member 13, the insulation member 13 being at least partially located between the first busbar component 120 and the first box body wall 113, and at least covering a surface of the fusing portion 122 facing the first box body wall 113.

[0138] The insulation piece 13 includes a first portion 131 and a second portion 132 connected to each other, the first portion 131 is used to cover at least part of the surface of the connecting portion 121 facing the first cabinet wall 113, and the second portion 132 is used to cover the surface of the fusing portion 122 facing the first cabinet wall 113; the size of the first portion 131 is different from the size of the second portion 132, and / or the material of the first portion 131 is different from the material of the second portion 132. The thickness of the first portion 131 is smaller than the thickness of the second portion 132, and / or the melting point of the material of the first portion 131 is smaller than the melting point of the material of the second portion 132. In the width direction of the first busbar 120, the size of the second portion 132 is greater than the size of the first portion 131.

[0139] The battery device further includes a fixing piece 14 used to limit the first shell wall 201 and located on the side of the first shell wall 201 facing the first cabinet wall 113, and the insulation piece 13 further includes a third portion 133 at least partially located between the first busbar 120 and the fixing piece 14 and covering at least the surface of the fusing portion 122 facing the fixing piece 14. The third portion 133 includes a first region 1331 and a second region 1332 bent relative to each other, the first region 1331 is located between the first shell wall 201 and the fixing piece 14, and the second region 1332 is located between the fusing portion 122 and the fixing piece 14. The third portion 133 further includes a third region 1333 bent relative to the second region 1332, the third region 1333 is located between the first busbar 120 and the first cabinet wall 113, and the third region 1333 is stacked with the second portion 132 in the thickness direction of the second portion 132. The third region 1333 includes a main body region 1335 and an extension region 1334 connected to the main body region 1335, and the extension region 1334 covers at least part of the surface of the fusing portion 122 facing the first cabinet wall 113; in the width direction of the first busbar 120, the size of the extension region 1334 is greater than the size of the main body region 1335. The third region 1333 is located between the second portion 132 and the first busbar 120.

[0140] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a box body (11) comprising a first box wall (113); a plurality of battery cells (20) accommodated in the box body (11), a first shell wall (201) of the battery cell (20) being provided with an electrode terminal (202), the first shell wall (201) facing the first box wall (113); a plurality of busbar components (12) for electrically connecting the plurality of battery cells (20), the plurality of busbar components (12) comprising a first busbar component (120), the first busbar component (120) comprising a connecting portion (121) for electrically connecting the electrode terminals (202) of the plurality of battery cells (20) and a fusing portion (122), at least part of a surface of the first busbar component (120) being arranged opposite to the first box wall (113); an insulating member (13) at least partially located between the first busbar component (120) and the first box wall (113) and covering at least a surface of the fusing portion (122) facing the first box wall (113).

2. The battery device according to claim 1, characterized by The insulating member (13) comprises a first portion (131) and a second portion (132) connected to each other, the first portion (131) being configured to cover at least part of a surface of the connecting portion (121) facing the first box wall (113), and the second portion (132) being configured to cover a surface of the fusing portion (122) facing the first box wall (113); a size of the first portion (131) is different from a size of the second portion (132), and / or a material of the first portion (131) is different from a material of the second portion (132).

3. The battery device of claim 2, wherein A thickness of the first portion (131) is smaller than a thickness of the second portion (132), and / or a melting point of the material of the first portion (131) is smaller than a melting point of the material of the second portion (132).

4. The battery device according to claim 2 or 3, characterized by The thickness T2 of the second portion (132) and the melting point P2 of the material of the second portion (132) satisfy one of the following conditions: P2≤300℃, and T2≥0.1mm; or 300℃≤P2≤500℃, and T2≥0.07mm; or P2≥500℃, and T2≥0.5mm.

5. The battery device according to any one of claims 2 to 4, characterized by, In a width direction of the first busbar component (120), a size of the second portion (132) is greater than a size of the first portion (131).

6. The battery device according to any one of claims 2 to 5, characterized by, The battery device further comprises: a fixing member (14) configured to limit the first shell wall (201) and located on a side of the first shell wall (201) facing the first box wall (113), and the insulating member (13) further comprises a third portion (133) at least partially located between the first busbar component (120) and the fixing member (14) and covering at least a surface of the fusing portion (122) facing the fixing member (14).

7. The battery device of claim 6, wherein The third part (133) comprises a relatively bent first area (1331) and a second area (1332), the first area (1331) is located between the first shell wall (201) and the fixing part (14), and the second area (1332) is located between the fusing part (122) and the fixing part (14).

8. The battery device according to claim 6 or 7, characterized by The third part (133) is connected with the second part (132), or the third part (133) and the second part (132) are an integral structure.

9. The battery device of claim 7, wherein, The third part (133) further comprises a third area (1333) which is relatively bent with the second area (1332), the third area (1333) is located between the first busbar component (120) and the first box wall (113), and the third area (1333) and the second part (132) are stacked in the thickness direction of the second part (132).

10. The battery device of claim 9, wherein, In the width direction of the first busbar component (120), the size of the part of the third area (1333) covering the first busbar component (120) is greater than or equal to 5mm.

11. The battery device according to claim 9 or 10, characterized by The third area (1333) comprises a main body area (1335) and an extension area (1334) connected with the main body area (1335), and the extension area (1334) covers at least part of the surface of the fusing part (122) facing the first box wall (113). In the width direction of the first busbar component (120), the size of the extension area (1334) is greater than the size of the main body area (1335).

12. The battery device according to any one of claims 9 to 11, characterized by, The third area (1333) is located between the second part (132) and the first busbar component (120).

13. The battery device according to any one of claims 9 to 11, wherein The third area (1333) is connected with the second part (132), or the third area (1333) and the second part (132) are an integral structure.

14. The battery device according to any one of claims 6 to 13, characterized by, The material of the second part (132) comprises polyimide and / or ceramic silicone rubber; and / or, The material of the third part (133) comprises polyimide and / or ceramic silicone rubber.

15. The battery device according to any one of claims 6 to 14, characterized by, A plurality of battery monomers (20) are arranged in a column along a first direction, the battery device comprises at least two columns of battery monomers (20) arranged along a second direction; the fixing part (14) extends along the first direction and connects the box (11); wherein the fixing part (14) limits the first shell wall (201) of a column of battery monomers (20); or the fixing part (14) is located at the adjacent position of two adjacent columns of battery monomers (20), and limits the first shell wall (201) of the two columns of battery monomers (20).

16. The battery device according to any one of claims 6 to 15, characterized by, The box (11) is provided with a beam (114) between the second walls (204) of two rows of battery cells (20) arranged in a second direction, the first shell wall (201) intersects the second wall (204), the fixing member (14) is located on the side of the beam (114) facing the first box wall (113), and is an integral structure with the beam (114); the fixing member (14) limits the first shell wall (201) of the two rows of battery cells (20).

17. The battery device of any one of claims 6-16, wherein, The distance between the surface of the first busbar component (120) facing the fixing member (14) and the fixing member (14) is less than or equal to 30mm; and / or, the fixing member (14) is at least partially metal.

18. The battery device of any one of claims 1-17, wherein, The distance between the surface of the first box wall (113) facing the melting portion (122) and the first box wall (113) is less than or equal to 30mm.

19. The battery device of any one of claims 1-18, wherein, The first busbar component (120) includes a plurality of connection portions (121), which include a first connection portion (1211) for electrically connecting with a first electrode terminal (211) of a first battery cell (21) and a second connection portion (1212) for electrically connecting with a second electrode terminal (221) of a second battery cell (22), and the melting portion (122) is located between the first connection portion (1211) and the second connection portion (1212).

20. The battery device of any one of claims 1-19, wherein, The battery device includes a plurality of busbar components (12) arranged in a first direction, the insulating member (13) extends in the first direction and covers the surface of the plurality of busbar components (12) facing the first box wall (113), and at least one of the plurality of busbar components (12) is the first busbar component (120), and the insulating member (13) covers the melting portion (122) of the at least one first busbar component (120).

21. The battery device of any one of claims 1-20, wherein, The first shell wall (201) is provided with a pressure relief mechanism (203).

22. An electrical device, comprising: The battery device according to any one of claims 1 to 21 is used for storing or providing electric energy.

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