Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment. The battery device comprises a plurality of battery cells and a separator, the plurality of battery cells are arranged along the thickness direction of the battery cells, each battery cell comprises two first surfaces which are oppositely arranged along the thickness direction, and each first surface comprises a central area and an edge area which is arranged around the central area; the separators are arranged between the edge areas of the first surfaces of the adjacent battery monomers and are respectively fixed with the edge areas of the adjacent battery monomers, and the tensile strength of the separators is greater than or equal to the connection strength between the separators and the battery monomers. According to the battery device provided by the embodiment of the invention, expansion of the battery monomers can be reduced, and the reliability is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery device and electrical equipment. Background Art

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] The development of battery technology must take into account multiple design factors at the same time. For example, how to improve the reliability of battery cells is an important research direction in the battery field. Utility Model Content

[0004] The present application provides a battery device and an electrical equipment, which can improve the reliability of the battery device.

[0005] In a first aspect, the present application provides a battery device comprising a plurality of battery cells and an isolating member. The plurality of battery cells are arranged along a thickness direction of the battery cells. The battery cells comprise two first surfaces arranged opposite to each other along the thickness direction. The first surfaces comprise a central area and an edge area arranged around the central area. The isolating member is arranged between edge areas of the first surfaces of adjacent battery cells and is respectively fixed to edge areas of adjacent battery cells.

[0006] In the technical solution of the embodiment of the present application, a plurality of battery cells are arranged in sequence along the thickness direction thereof, and a spacer is provided between at least some adjacent battery cells, and the spacer is located at the edge region of the first surface of the battery cell and is connected to the adjacent battery cell at the same time. During operation, the central region of the battery cell is prone to expansion, and after the central regions of two adjacent battery cells expand and counteract each other, the spacer is not prone to deformation and can cause a deformation difference between the edge region and the central region, thereby providing a pulling force from the central region to the edge region to the expanded central region through the spacer, thereby reducing the expansion of the battery cell and improving the reliability of the battery device.

[0007] According to some embodiments of the present application, a spacer is provided between each adjacent battery cell, and the two opposite sides of the spacer in the thickness direction are respectively connected to two adjacent battery cells. A spacer is provided between each two battery cells to further improve the overall reliability of the battery device.

[0008] According to some embodiments of the present application, the connection strength between the isolation member and the battery cell is greater than or equal to 10 MPa, so that the isolation member is not easily separated when a pulling force is applied to the battery cells on both sides.

[0009] According to some embodiments of the present application, the connection strength between the separator and the battery cell is greater than or equal to 50 MPa, which further improves the connection strength between the separator and the battery cell and makes it difficult to peel off.

[0010] According to some embodiments of the present application, the isolation member is connected to the battery cell by bonding or welding, so that the connection between the isolation member and the battery cell is stable.

[0011] According to some embodiments of the present application, the tensile strength of the separator is greater than or equal to the connection strength between the separator and the battery cell, thereby reducing the possibility of the separator breaking when subjected to tension and improving the reliability of the battery device.

[0012] According to some embodiments of the present application, the elastic modulus of the isolation member is greater than or equal to 1 GPa, so that the isolation member has a certain strength and is not easily deformed.

[0013] According to some embodiments of the present application, the size of the separator is 0.5 mm to 3 mm in the thickness direction, which reduces the possibility of low structural strength due to the separator being too thin and the possibility of reduced energy density of the battery device due to the separator being too thick.

[0014] According to some embodiments of the present application, the spacers are symmetrically arranged in the first direction and the second direction, and are arranged to intersect each other in the thickness direction, the first direction, and the second direction, so that the first surface of the battery cell is uniformly stressed as a whole.

[0015] According to some embodiments of the present application, in the first direction, the size of the central area is L1, and the size of the first surface is L2; ​​in the second direction, the size of the central area is L3, and the size of the first surface is L4; 0.7≤L1 / L2≤0.95, 0.7≤L3 / L4≤0.95. The possibility of weakening the effect of balancing the expansion force due to the excessive extension of the isolation member to the center of the first surface is reduced.

[0016] According to some embodiments of the present application, the isolating member includes a plurality of isolating sub-members, and the plurality of isolating sub-members are arranged at intervals along the circumference of the edge region, so that the position of the isolating member can be flexibly adjusted and the isolating member is conveniently connected to the battery cell.

[0017] According to some embodiments of the present application, the first surface is rectangular, the isolating element includes four isolating elements, and the four isolating elements are respectively arranged at the four corners of the first surface; the size of each isolating element in the first direction is L5, and the size in the second direction is L6, 0.05≤L5 / L2≤0.1, 0.05≤L6 / L4≤0.1. The first surface is subjected to uniform force, and the size of the isolating element is appropriate.

[0018] According to some embodiments of the present application, the isolating member has a first edge facing the central region and a second edge away from the central region, the first edge is arc-shaped and is recessed in a direction away from the central region, and the second edge is arranged in a conformal manner with the edge of the first surface. By making the inner edge of the isolating member arc-shaped, stress concentration can be reduced, thereby reducing the possibility of damage to the first surface of the battery cell.

[0019] According to some embodiments of the present application, L2>L4, a plurality of isolating sub-components extend along the first direction and are arranged opposite to each other in the second direction, the extension dimension of each isolating sub-component in the first direction is L7, and the extension dimension in the second direction is L8; 0.8≤L7 / L2≤1, 0.05≤L8 / L4≤0.1. The isolating sub-components may be in the form of a structure extending along the long side of the first surface and have an adapted length and width.

[0020] According to some embodiments of the present application, the spacer extends in a ring shape, and along the thickness direction, the orthographic projection of the spacer on the first surface surrounds the central area, and the spacer includes two first sections extending along the first direction and two second sections extending along the second direction; the size of the first section in the second direction is L9, and the size of the second section in the first direction is L10, 0.05≤L10 / L2≤0.1, 0.05≤L9 / L4≤0.1. The spacer is set to be ring-shaped to further weaken the expansion force and make it have a suitable size, thereby improving the reliability of the battery device.

[0021] According to some embodiments of the present application, the battery cell includes a shell and an electrode assembly disposed in the shell, the electrode assembly includes an electrode body and a tab, and along the thickness direction, the edge of the orthographic projection of the electrode body and the edge of the orthographic projection of the separator are staggered to reduce the possibility of the shell at the junction of the orthographic projection of the electrode body and the separator being damaged by shear force.

[0022] According to some embodiments of the present application, the battery device further includes an end plate and an end isolator, the end plate is disposed on at least one side of the plurality of battery cells in the thickness direction, the end isolator is disposed between the edge region of the battery cell and the end plate, and opposite sides of the end isolator are respectively fixed to the end plate and the battery cell. An isolator is also disposed between the battery cell and the end plate to further improve the reliability of the battery device.

[0023] According to some embodiments of the present application, the battery device further includes a heat management component, which is at least partially disposed between the central regions of adjacent battery cells. The heat management component is disposed in the gap formed by the isolation component and is close to the central region, thereby improving space utilization and heat exchange efficiency.

[0024] In a second aspect, the present application provides an electrical device, comprising the battery device in any embodiment of the first aspect, and the battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0026] Figure 1 A simplified schematic diagram of a vehicle provided for some embodiments of the present application;

[0027] Figure 2 An exploded schematic diagram of a battery device provided in some embodiments of the present application;

[0028] Figure 3 A schematic diagram of a partial structure of a battery device provided in some embodiments of the present application;

[0029] Figure 4 A schematic diagram of a partial structure of a battery device provided in some other embodiments of the present application;

[0030] Figure 5 A schematic diagram of a partial structure of a battery device provided in some other embodiments of the present application;

[0031] Figure 6 A schematic diagram of a partial structure of a battery device provided in some other embodiments of the present application;

[0032] Figure 7 A schematic diagram of a partial structure of a battery device provided in some other embodiments of the present application;

[0033] Figure 8 A schematic diagram of a partial structure of a battery device provided in some other embodiments of the present application;

[0034] Fig. 9 Schematic diagram of the partial structure of a battery device provided in some other embodiments of the present application.

[0035] Reference numerals:

[0036] 1000-Vehicles;

[0037] 100-battery device; 200-controller; 300-motor;

[0038] 10-battery cell; 20-isolator; 30-end plate; 40-end isolator; 50-box;

[0039] 11-first surface; 12-housing; 13-electrode assembly; 21-isolating sub-component; 22-first section; 23-second section; 51-first box body; 52-second box body; 53-accommodating portion;

[0040] 111-central area; 112-edge area; 131-electrode body; 132-electrode ear; 211-first edge; 212-second edge;

[0041] X-thickness direction; Y-first direction; Z-second direction. DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0044] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0045] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0047] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0048] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0051] 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 storage battery, etc., which is not limited in the embodiments of the present application.

[0052] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0053] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0054] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0055] As an example, the positive electrode current collector may be a metal foil or a composite current collector.

[0056] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0057] As an example, the negative electrode current collector may be a metal foil, a foamed metal, or a composite current collector.

[0058] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0059] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0060] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc.

[0061] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0062] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0063] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0064] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0065] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0066] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0067] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0068] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0069] In some embodiments, the housing may be provided with functional components such as electrode terminals, etc. The electrode terminals may be used to electrically connect to the electrode assembly to output or input electrical energy of the battery cell.

[0070] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack 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 polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0071] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0072] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0073] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0074] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0075] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0076] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0077] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0078] In a battery device, a plurality of battery cells are usually provided, and these battery cells can be optionally arranged in sequence along the thickness direction thereof, and electrically connected to each other in parallel / series / mixed connection. Since the volume of battery cells is easily expanded due to heat generation and gas production during operation, a buffer pad provided on the entire surface can be bonded and connected between two adjacent battery cells to absorb the expansion force. At the same time, end plates can be provided on both sides of the battery module composed of a plurality of battery cells to compress the battery cells and prevent the bonding joints from cracking due to expansion. That is, the isolating members in the existing battery device usually adopt a weak connection with the adjacent battery cells, and the isolating members are used to bear the pressure.

[0079] However, the expansion force generated by the battery cell during operation is relatively large, and the force cannot be transmitted outward after the buffer pad is squeezed. The expansion force gradually increases and is easy to damage the structure of the battery module. At the same time, the method of fixing the battery cell by end plates and / or side plates requires high strength of the end plates and sides, and the thickness of the end plates and side plates required is also relatively large, resulting in a decrease in the energy density of the battery device.

[0080] In view of this, an embodiment of the present application provides a technical solution, which sets an isolation member in the edge area of ​​the first surface of the battery cell to weaken the expansion force of the battery cell, and a strong connection is adopted between the isolation member and the battery cell. The isolation member can be used to bear the tensile force to balance the expansion pressure on the battery cell, thereby effectively improving the reliability of the battery device.

[0081] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical equipment using battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc., wherein spacecrafts include airplanes, rockets, space shuttles and spacecrafts, etc., electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0082] The battery cells described in the embodiments of the present application are not limited to the electrical equipment described above, but for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0083] See also Figure 1 , Figure 1A simple schematic diagram of a vehicle provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 may be provided inside the vehicle 1000, and specifically, for example, a battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used, for example, to control the battery to power the motor 300. The battery may be used for starting and navigating the vehicle 1000, and of course, the battery device 100 may also be used to drive the vehicle 1000, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0084] Figure 2 Schematic diagram of an explosion of a battery device provided in some embodiments of the present application. Figure 2 As shown, the battery device 100 includes a case 50 and a battery cell 10 , and the battery cell 10 is accommodated in the case 50 .

[0085] The box 50 is used to accommodate the battery cell 10, and the box 50 can be a variety of structures. In some embodiments, the box 50 may include a first box portion 51 and a second box portion 52, the first box portion 51 and the second box portion 52 cover each other, and the first box portion 51 and the second box portion 52 jointly define a receiving portion 53 for accommodating the battery cell 10. The second box portion 52 may be a hollow structure with one end open, the first box portion 51 is a plate-like structure, and the first box portion 51 covers the open side of the second box portion 52 to form a box 50 with a receiving portion 53; the first box portion 51 and the second box portion 52 may also be a hollow structure with one side open, and the open side of the first box portion 51 covers the open side of the second box portion 52 to form a box 50 with a receiving portion 53. Of course, the first box portion 51 and the second box portion 52 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0086] In the battery device 100, there can be one or more battery cells 10. If there are more than one battery cell 10, the battery cells 10 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 10 are both connected in series and in parallel. The battery cells 10 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the battery cells 10 can be accommodated in the box 50; of course, the battery cells 10 can also be connected in series, in parallel, or in a mixed connection to form a battery module, and then the battery modules can be connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box 50.

[0087] In some embodiments, there are multiple battery cells 10 , and the multiple battery cells 10 are first connected in series, in parallel, or in hybrid connection to form a battery module. The multiple battery modules are then connected in series, in parallel, or in hybrid connection to form a whole, and are accommodated in the box 50 .

[0088] Next, combine with Figure 3 To Attachment Figure 8 The structures of the battery device 100 and the electric equipment are described.

[0089] Please also read Figure 3 to Figure 4 , Figure 3 A schematic diagram of a partial structure of a battery device provided in some embodiments of the present application, Figure 4 Schematic diagram of the partial structure of a battery device provided in some other embodiments of the present application.

[0090] In the first aspect, the present application provides a battery device 100, including a plurality of battery cells 10 and an isolation member 20. The plurality of battery cells 10 are arranged along a thickness direction X of the battery cells 10. The battery cells 10 include two first surfaces 11 arranged opposite to each other along the thickness direction X. The first surface 11 includes a central area 111 and an edge area 112 arranged around the central area 111. The isolation member 20 is arranged between the edge areas 112 of the first surfaces 11 of adjacent battery cells 10, and is respectively fixed to the edge areas 112 of adjacent battery cells 10.

[0091] The embodiment of the present application provides a battery device 100, which includes a plurality of battery cells 10 arranged in sequence along the thickness direction X thereof and a spacer 20 disposed between the battery cells 10 for weakening the expansion force. The plurality of battery cells 10 may be selected to have the same or similar shape, size and structure. The plurality of battery cells 10 are arranged in one time along the thickness direction X thereof so that the two surfaces with larger areas thereof are respectively arranged opposite to the side surfaces of the adjacent battery cells 10, and the surface intersecting with the thickness direction X is recorded as the first surface 11.

[0092] Optionally, the first surface 11 may have a central region 111 and an edge region 112 disposed around the central region 111, wherein the edge region 112 may have a narrower width dimension. The boundary line between the edge region 112 and the central region 111 may be configured to conform to the edge line of the first surface 11, so that the edge region 112 has a relatively uniform width dimension at all locations. During the operation of the battery cell 10, the central region 111 generally generates a greater expansion force than the edge region 112.

[0093] The isolating member 20 is disposed between the first surfaces 11 of two adjacent battery cells 10, and is simultaneously connected to the edge regions 112 of the two first surfaces 11 on both sides. The isolating member 20 may be selected to have a high structural strength and a high connection strength with the first surface 11, so that it can bear a large force. The isolating member 20 may be selected to include a stacked multilayer substructure, which together constitutes an isolating member 20 with parallel surfaces on both sides, and these substructures also need to have a high connection strength to facilitate processing. Alternatively, the isolating member 20 may be selected to be a single-layer sheet structure with parallel surfaces on both sides, so as to improve its overall structural strength and facilitate connection with the battery cell 10.

[0094] Taking two adjacent battery cells 10 and the isolation member 20 arranged between the battery cells 10 as an example, during the operation of the battery device 100, the central area 111 of the two adjacent battery cells 10 is prone to expansion, and their two opposite first surfaces 11 are prone to expand and bulge toward each other and abut against each other in the central area 111, thereby applying pressure to each other's central area 111.

[0095] At the same time, due to the expansion deformation of the central area 111, there is a position difference between the edge area 112 and the central area 111 in the thickness direction X. At this time, since the separator 20 is not easy to deform and is firmly connected to the edge areas 112 on both sides, a pulling force can be applied to the edge areas 112 of the battery cells 10 on both sides, thereby forming a pulling force from the central area 111 to the edge area 112 on the first surfaces 11 on both sides. Through this pulling force, the expansion force generated in the central area 111 can be offset by the pulling force at the separator 20, thereby reducing the amount of bulging of the battery cell 10 after expansion and the expansion force on the overall structure of the battery device 100, reducing the possibility of damage to the battery device 100 due to excessive expansion force, and improving the reliability of the battery device 100.

[0096] In some optional embodiments, an isolation member 20 is disposed between each adjacent battery cell 10 , and opposite sides of the isolation member 20 in the thickness direction X are respectively connected to two adjacent battery cells 10 .

[0097] On the basis that the battery device 100 includes a plurality of battery cells 10 , an isolation member 20 may be provided between every two battery cells 10 . These isolation members 20 may be selected to have the same or similar shape, size and setting position so that the forces on each battery cell 10 are balanced and uniform.

[0098] By providing the separator 20 between every two battery cells 10 , the reliability of the entire battery device 100 can be further improved.

[0099] In some optional embodiments, the connection strength between the separator 20 and the battery cell 10 is greater than or equal to 10 MPa.

[0100] When the battery cell 10 expands, the spacer 20 is used to transfer the pulling force to the edge region 112 thereof, so that the spacer 20 and the battery cell 10 should have a high connection strength to reduce the possibility of the spacer 20 and the battery cell 10 peeling off or detaching from each other during the force transfer process. Specifically, the connection strength between the spacer 20 and the battery cell 10 can be greater than or equal to 10 MPa.

[0101] Optionally, the connection strength between the separator 20 and the battery cell 10 can be measured by a peeling test or the like. The peeling test here refers to an experiment for testing the maximum force required for unit width peeling of materials connected to each other from the contact surface, which can be tested by a peel strength tester.

[0102] The connection strength can characterize the tightness and reliability of the fixed connection between the isolation member 20 and the battery cell 10. By making the connection strength between the two greater than or equal to 10 MPa, the isolation member 20 can be prevented from detaching easily when applying tension to the battery cells 10 on both sides, thereby improving the reliability of the battery device 100.

[0103] In some optional embodiments, the connection strength between the separator 20 and the battery cell 10 is greater than or equal to 50 MPa.

[0104] On the basis of the aforementioned connection strength range, the connection strength between the isolation member 20 and the battery cell 10 may be further increased to be greater than or equal to 50 MPa to ensure a stable connection between the two, thereby further reducing the possibility of separation between the two and improving the reliability of the battery device 100 .

[0105] In some optional embodiments, the isolation member 20 is connected to the battery cell 10 by bonding or welding.

[0106] On the basis of ensuring that the connection strength between the battery cell 10 and the isolation member 20 is within the aforementioned range, the two may be optionally connected by adhesive or welding. The specific connection method may be selected based on parameters such as the material and thickness of the isolation member 20 and the side wall of the battery cell 10 having the first surface 11.

[0107] For example, in an embodiment where the isolation member 20 is made of a non-metallic material such as hard plexiglass, the isolation member 20 can be adhesively connected to the battery cell 10; in an embodiment where the isolation member 20 is made of a metal material such as aluminum, its alloys, steel, etc., the isolation member 20 can be welded to the battery cell 10.

[0108] By bonding or welding the separator 20 to the battery cell 10 , the separator 20 and the battery cell 10 can be firmly connected and easily form a high connection strength, and the two can be easily connected.

[0109] In some optional embodiments, the tensile strength of the separator 20 is greater than or equal to the connection strength between the separator 20 and the battery cell 10 .

[0110] Optionally, on the basis of ensuring that the isolation member 20 and the battery cell 10 have a high connection strength, the isolation member 20 may further have a high tensile strength, specifically, the tensile strength may be greater than or equal to the connection strength between the isolation member 20 and the battery cell 10 .

[0111] It is understood that the tensile strength here refers to the maximum load-bearing capacity of the separator 20 under static tension conditions, that is, the resistance to the maximum uniform plastic deformation of the separator 20. By making the tensile strength of the separator 20 greater than or equal to the connection strength between the separator 20 and the battery cell 10, the possibility of the separator 20 breaking before being peeled off from the battery cell 10 can be reduced while the separator 20 has a higher structural strength, thereby improving the reliability of the battery device 100.

[0112] In some optional embodiments, the elastic modulus of the isolation member 20 is greater than or equal to 1 GPa.

[0113] Optionally, when selecting the material and processing technology of the isolation member 20, the elastic modulus of the isolation member 20 can be greater than or equal to 1 GPa, so that it has higher rigidity and is not easy to deform, so that the degree of deformation generated by itself when bearing tensile load is low enough, thereby reducing the possibility of excessive deformation of the isolation member 20 itself during operation of the battery device 100, resulting in the inability to transmit tensile force well.

[0114] The reliability of the battery device 100 can be further improved by making the separator 20 have a certain strength and not be easily deformed.

[0115] In some optional embodiments, in the thickness direction X, the size of the spacer 20 is 0.5 mm-3 mm.

[0116] In the thickness direction X of the battery cells 10, the size of the spacer 20 may be between 0.5 mm and 3 mm, for example, any one of 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or any two thereof. The spacer 20 may have the same thickness everywhere.

[0117] By limiting the thickness of the isolation member 20, the possibility of the isolation member 20 being too thin, resulting in low structural strength and easy deformation, can be reduced. At the same time, the possibility of the isolation member 20 being too thick, resulting in too wide gaps between battery cells 10 and a decrease in the volume energy density of the battery device 100 can be reduced.

[0118] In some optional embodiments, the isolation members 20 are symmetrically arranged in the first direction Y and the second direction Z, and the thickness direction X, the first direction Y and the second direction Z are arranged to intersect each other.

[0119] When the isolation member 20 is arranged on the battery cell 10, it should be staggered with the central area 111 where the expansion is more serious. At the same time, since the isolation member 20 can provide a force from the central area 111 to the edge area 112 to the part of the shell wall located in the central area 111, the isolation member 20 can be symmetrically distributed on the first surface 11 so that the part of the wall is subjected to a uniform force.

[0120] Specifically, the isolating member 20 is disposed on one side of the first surface 11 in the thickness direction X, and the first direction Y, the second direction Z, and the thickness direction X are arranged to intersect each other, and the isolating member 20 can be symmetrically arranged in the second direction Z and the third direction. Exemplarily, in an embodiment where the first surface 11 is rectangular, the edge region 112 can include four sections that are respectively parallel to the four sides of the rectangle, and one or more isolating sub-members 21 can be arranged in each section, or one or more isolating sub-members 21 can be respectively arranged at the corners where each two sections intersect.

[0121] By arranging the spacers 20 symmetrically in two directions, the first surface 11 of the battery cell 10 can be uniformly stressed as a whole, reducing the possibility of the first surface 11 bulging at a location off-center due to uneven stress, thereby improving the reliability of the battery device 100 .

[0122] In some optional embodiments, in the first direction Y, the size of the central area 111 is L1, and the size of the first surface 11 is L2; ​​in the second direction Z, the size of the central area 111 is L3, and the size of the first surface 11 is L4; 0.7≤L1 / L2≤0.95, 0.7≤L3 / L4≤0.95.

[0123] The first surface 11 of the battery cell 10 includes a central area 111 and an edge area 112 surrounding the central area 111, wherein the edge area 112 should have a narrower width. Since the isolation member 20 needs to be connected between two battery cells 10 and transmit tension, the closer its setting position is to the center of the first surface 11, the worse its effect of reducing expansion force is. Therefore, the width of the edge area 112 can be made narrower, and the isolation member 20 can be correspondingly set in the narrower area.

[0124] In the first direction Y, the size of the central area 111 is recorded as L1, and in the second direction Z, the size of the central area 111 is recorded as L3. Specifically, the edge area 112 is arranged around the central area 111, and it can be selected to include two areas arranged oppositely in the first direction Y and two areas arranged oppositely in the second direction Z. These four areas can be arranged end to end. The central area 111 and the edge area 112 can be arranged in contact, and the sum of the two covers the first surface 11.

[0125] Furthermore, the size of the first surface 11 as a whole in the first direction Y is recorded as L2, and the size of the first surface 11 in the second direction Z is recorded as L4, then L1 / L2 and L3 / L4 should be between 0.7-0.95, for example, it can be any one of 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 or between any two thereof, that is, the size of the central area 111 on the first surface 11 should account for greater than or equal to 70% and less than or equal to 95%. Correspondingly, the size of the edge area 112 on the first surface 11 should account for less than or equal to 30% and greater than or equal to 5%. The isolation member 20 is arranged in the edge area 112, and correspondingly, its width dimension can account for less than or equal to 30% of the size of the first surface 11 in the corresponding direction.

[0126] By limiting the size of the central area 111 , the possibility that the spacer 20 extends too long toward the center of the first surface 11 , thereby weakening the effect of balancing the expansion force, can be reduced.

[0127] In some optional embodiments, the isolation element 20 includes a plurality of isolation sub-elements 21 , and the plurality of isolation sub-elements 21 are arranged at intervals along the circumference of the edge region 112 .

[0128] Optionally, when setting the isolation member 20, the isolation member 20 can include a plurality of isolation sub-members 21, which can be arranged at circumferential intervals along the edge area 112 and symmetrically arranged in the first direction Y and the second direction Z as described above, so that the first surface 11 is subjected to uniform force as a whole.

[0129] By configuring the spacer 20 to include a plurality of spacer sub-components 21 , the flexibility of adjusting the location of the spacer 20 can be improved, the weight of the spacer 20 can be reduced, and the spacer 20 can be easily connected to the battery cell 10 .

[0130] In some optional embodiments, the first surface 11 is rectangular, and the isolation member 20 includes four isolation sub-members 21, which are respectively arranged at the four corners of the first surface 11; the size of each isolation sub-member 21 in the first direction Y is L5, and the size in the second direction Z is L6, 0.05≤L5 / L2≤0.1, 0.05≤L6 / L4≤0.1.

[0131] For example, the first surface 11 of the battery cell 10 may be rectangular as a whole, and an isolating sub-component 21 is provided at a right angle formed by the intersection of every two adjacent sides, and a total of four isolating sub-components 21 are provided. In this embodiment, the four isolating sub-components 21 may be of the same shape and size so that the center area 111 is subjected to balanced force.

[0132] In the first direction Y, the size of each isolating sub-component 21 is L5, and the size of the first surface 11 as a whole is L2. In the second direction Z, the size of each isolating sub-component 21 is L6, and the size of the first surface 11 as a whole is L4. On this basis, it is possible to make 2L5 / L2 between 0.05-0.2, and 2L6 / L4 between 0.05-0.2. Further, it is possible to make 0.05≤L5 / L2≤0.1, 0.05≤L6 / L4≤0.1, and the specific values ​​of the two ratios can be any one of 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, or between any two of them.

[0133] By arranging four isolating sub-components 21 at the four corners of the first surface 11, the uniformity of the tension received by the central area 111 after expansion can be improved, and the effect of balancing and offsetting the expansion force can be improved. By limiting the size of the isolating sub-components 21, the possibility of too small isolating sub-components 21 leading to too low structural strength and connection strength can be reduced, and the possibility of too large isolating sub-components 21 extending too long to the central area 111 and reducing the effect of balancing the expansion force can be reduced.

[0134] See also Figure 5 , Figure 5 Schematic diagram of a partial structure of a battery device provided in some other embodiments of the present application. In some optional embodiments, the isolation sub-component 21 has a first edge 211 facing the central area 111 and a second edge 212 away from the central area 111, the first edge 211 is arc-shaped and is recessed in a direction away from the central area 111, and the second edge 212 is arranged in a shape conforming to the edge of the first surface 11.

[0135] In an embodiment where the isolation member 20 includes a plurality of isolation sub-members 21 spaced circumferentially along the central region 111, each isolation sub-member 21 may have an inner edge toward the central region 111, which is recorded as the first edge 211, and the other opposite side may have an outer edge toward the edge line of the first surface 11, which is recorded as the second edge 212.

[0136] On this basis, the outer second edge 212 may be configured to conform to the edge of the first surface 11, and may further overlap with each other, that is, the orthographic projection of the second edge 212 in the thickness direction X may overlap with the orthographic projection edge of the first surface 11 in part, or may be parallel with a small spacing. At the same time, the first edge 211 may be arc-shaped, and when the first edge 211 is orthographically projected along the thickness direction X, the orthographic projection figure formed by the first edge 211 may be at least partially circular arc-shaped or elliptical arc-shaped.

[0137] By setting the first edge 211 to extend along an arc, it is possible to avoid the central area 111, thereby reducing the possibility that the effect of balancing the expansion force due to the extension of the isolation component 21 to the central area 111 will be reduced, and the possibility that the battery cell 10 will be damaged due to stress concentration caused by the inconsistent direction of the expansion force in the central area and the pulling force at the isolation component 20, thereby improving the overall reliability of the battery device 100.

[0138] See also Figure 6 , Figure 6 Schematic diagram of the partial structure of the battery device provided in some other embodiments of the present application. In some optional embodiments, L2>L4, a plurality of isolation sub-components 21 extend along the first direction Y and are arranged opposite to each other in the second direction Z, and the extension dimension of each isolation sub-component 21 in the first direction Y is L7, and the extension dimension in the second direction Z is L8; 0.8≤L7 / L2≤1, 0.05≤L8 / L4≤0.1.

[0139] Optionally, the isolation member 20 may also be provided as two oppositely disposed isolation sub-members 21. Taking L2 as greater than L4, that is, the dimension of the first surface 11 in the first direction Y is greater than the dimension in the second direction Z as an example, the isolation member 20 may include two isolation sub-members 21 extending along the first direction Y, which are respectively disposed in two oppositely disposed sub-regions in the second direction Z in the edge region 112.

[0140] Optionally, in this embodiment, the dimension of each isolating sub-component 21 extending in the first direction Y may be the same as or slightly smaller than the dimension of the first surface 11 as a whole, and the dimension of the isolating sub-component 21 in the first direction Y is recorded as L7, and the dimension in the second direction Z is recorded as L8, then 0.8≤L7 / L2≤1, and the ratio may be specifically selected as any one of 0.8, 0.85, 0.9, 0.95, 1, or between any two thereof. At the same time, it may be selected as 0.05≤2L8 / L4≤0.2, and further selected as 0.05≤L8 / L4≤0.1, and the ratio may be specifically selected as any one of 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, or between any two thereof.

[0141] By limiting the size of the isolation sub-component 21 within the aforementioned range, the isolation sub-component 21 can be extended along the long side of the first surface 11, so that the isolation sub-component 21 can have a longer size and a larger area occupies in the edge area 112. At the same time, by limiting the width size, the isolation sub-component 21 can be reduced from extending too long into the central area 111. Combining the two can effectively improve the effect of reducing the expansion force.

[0142] It can be understood that, similar to the above-mentioned embodiment in which the isolating sub-component 21 extends along the first direction Y, the isolating component 20 can also include two isolating sub-components 21, and the two isolating sub-components 21 extend along the second direction Z. In this embodiment, the ratio of the size of the isolating sub-component 21 in the second direction Z to the size of the first surface 11 in the same direction can be 0.8-1, and the ratio of the size in the first direction Y to the size of the first surface 11 in the same direction can be 0.05-0.1.

[0143] See also Figure 7 , Figure 7 Schematic diagram of the partial structure of the battery device provided for some other embodiments of the present application. In some optional embodiments, the separator 20 extends in a ring shape, and along the thickness direction X, the orthographic projection of the separator 20 on the first surface 11 surrounds the central area 111, and the separator 20 includes two first sections 22 extending along the first direction Y and two second sections 23 extending along the second direction Z; the size of the first section 22 in the second direction Z is L9, and the size of the second section 23 in the first direction Y is L10, 0.05≤L10 / L2≤0.1, 0.05≤L9 / L4≤0.1.

[0144] Optionally, the isolating member 20 may also be provided as an annular structure, so that its orthographic projection on the first surface 11 is provided around the central area 111. In this embodiment, the extension track of the isolating member 20 may be the same as the extension track of the edge area 112, and includes two first sections 22 extending along the first direction Y and two second sections 23 extending along the second direction Z, and the first sections 22 and the second sections 23 may be alternately provided end to end. The extension track of the annular isolating member 20 may be the same as the extension track of the edge area, and the two may be provided in a conformal manner.

[0145] On this basis, the dimension of the first section 22 in the second direction Z is recorded as L9, and the dimension of the second section 23 in the first direction Y is recorded as L10, then 0.05≤2L10 / L2≤0.2, 0.05≤2L9 / L4≤0.1 can be selected. Further, 0.05≤L10 / L2≤0.1, 0.05≤L9 / L4≤0.1 can be selected, and the above two ratios can be specifically selected as any one of 0.05, 0.06, 0.07, 0.08, 0.09, 0.1 or between any two of them.

[0146] By setting the isolation member 20 to be ring-shaped, pulling force for balancing the expansion force can be provided in all directions at the same time, so as to further improve the uniformity of the force applied to the central area 111. At the same time, similar to the aforementioned embodiment, the reliability of the battery device 100 can be further improved by limiting the width dimension of the isolation member 20.

[0147] See also Figure 8 , Figure 8 Schematic diagram of the partial structure of the battery device provided in some other embodiments of the present application. In some optional embodiments, the battery cell 10 includes a housing 12 and an electrode assembly 13 disposed in the housing 12, the electrode assembly 13 includes an electrode body 131 and a tab 132, and along the thickness direction X, the edge of the orthographic projection of the electrode body 131 and the edge of the orthographic projection of the separator 20 are staggered.

[0148] Optionally, the battery cell 10 may be provided with a shell 12 for providing accommodation, support and protection, and an electrode assembly 13 disposed in the shell 12 for realizing electrical functions. The electrode assembly 13 may optionally include an electrode body 131 and a tab 132 for leading out the positive and negative poles of the electrode body 131. The tab 132 may optionally be electrically connected to an electrode terminal disposed in the shell 12.

[0149] When setting the separator 20, the inner edge of the separator 20 can be staggered with the edge of the electrode body 131 by adjusting the size, shape or setting position of the separator 20. Specifically, the separator 20 and the electrode body 131 are orthographically projected along the thickness direction X, and the edge of the orthographic projection of the separator 20 and the edge of the orthographic projection of the electrode body 131 are staggered with each other. Here, staggering means that in addition to the two extending in the same direction and overlapping with each other, the edge of the orthographic projection of the separator 20 and the edge of the orthographic projection of the electrode body 131 can have different extension directions and intersect at one point.

[0150] Exemplarily, in an embodiment where the isolation member 20 includes multiple isolation sub-members 21, each isolation sub-member 21 and the first surface 11 are rectangular, the isolation sub-members 21 and the electrode body 131 are projected along the thickness direction X, then the long side of the orthographic projection of each isolation sub-member 21 close to the central area 111 can be selected to be parallel to the long side of the orthographic projection of the electrode body 131, and the two edges should be spaced apart from each other in the width direction of the first surface 11, not intersecting, and have a spacing greater than a certain size.

[0151] Exemplarily, when the inner edge of the insulating member 20 on one side toward the central area 111 extends in a curve in an arc or other shape, depending on the size of the insulating member 20 and the specific shape of the curve, the inner edge of the orthographic projection of the insulating member 20 in the thickness direction X may intersect with the edge of the orthographic projection of the electrode body 131 in this direction at a certain point, and the two edge lines may have an angle greater than a certain degree.

[0152] During the operation of the battery device 100, the electrode body 131 is prone to expand and press outwardly on the wall portion where the first surface 11 is located, and the separator 20 is fixed between adjacent battery cells 10 to form a pulling force from the central area 111 to the edge area 112, so the directions of the forces applied by the two on the wall portion where the first surface 11 is located intersect or are opposite. By staggering the edges of the separator 20 and the electrode body 131, the possibility of the outer shell 12 located at the intersection of the orthographic projections of the two being damaged by shear force can be reduced.

[0153] See also Fig. 9 , Fig. 9 Schematic diagram of a partial structure of a battery device provided in some other embodiments of the present application. In some optional embodiments, the battery device 100 further includes an end plate 30 and an end insulator 40, the end plate 30 is disposed on at least one side of the plurality of battery cells 10 in the thickness direction X, the end insulator 40 is disposed between the edge region 112 of the battery cell 10 and the end plate 30, and the opposite sides of the end insulator 40 are fixed to the end plate 30 and the battery cell 10, respectively.

[0154] Optionally, in the thickness direction X, a plurality of battery cells 10 are arranged in sequence, and an end plate 30 may be provided in a direction away from each other between at least one of the two battery cells 10 at the end, for providing protection and fixing for the battery cells 10. Similar to the provision of the spacer 20 between adjacent battery cells 10, a spacer 20 may also be provided between the end plate 30 and the battery cell 10 at the end, that is, the end plate 30 spacer 20.

[0155] Optionally, the spacer 20 of the end plate 30 may have the same or similar shape, length and width, and location as the spacer 20 between adjacent battery cells 10, and may be connected and fixed in the same manner, such as bonding / welding. Since only one side of the battery cell 10 at the spacer 20 of the end plate 30 may expand, the thickness of the spacer 20 of the end plate 30 may be reduced accordingly to maintain the degree of weakening of the expansion force.

[0156] By also providing an end plate 30 isolation member 20 between the battery cell 10 and the end plate 30 for reducing the expansion force, the battery cell 10 and the end plate 30 can be firmly connected, while reducing the possibility of expansion damage to the battery cell 10 at the end, further improving the overall reliability of the battery device 100.

[0157] In some optional embodiments, the battery device 100 further includes a heat management component, which is at least partially disposed between the central regions 111 of adjacent battery cells 10 .

[0158] Optionally, in order to further reduce the expansion force of each battery cell 10, a thermal management component can be provided in the battery device 100, and the main area of ​​the thermal management component can be set at a position corresponding to the central area 111, that is, the main area for heat exchange in the thermal management component is located between the central areas 111 of adjacent battery cells 10.

[0159] For example, the heat management component may have a cavity, and the heat exchange medium may flow through the cavity. When the heat management component is provided, the orthographic projection of the region having the cavity in the thickness direction X may be mostly or entirely located within the orthographic projection contour of the central region 111. The inlet and outlet connected to both ends of the cavity may be located in the edge region 112 or extend outside the first surface 11, so as to facilitate the interconnection of adjacent heat management components.

[0160] Optionally, due to the larger expansion force generated by the central area 111, the thermal management component may have a thinner thickness dimension in the thickness direction X, and / or the thermal management component may be able to produce elastic deformation in this direction so that it can adapt to the expanded volume of the battery cell 10 and maintain a certain heat exchange efficiency.

[0161] The heat management component is arranged close to the central area 111, so that it can be accommodated in the gap between adjacent battery cells 10 formed by the thickness of the isolation member 20, thereby improving the space utilization rate. At the same time, the heat management component can be abutted or close to the central area 111 where heat is more serious during operation, thereby improving the heat exchange efficiency.

[0162] In a second aspect, the present application provides an electrical device, including the battery device 100 in any embodiment of the first aspect, and the battery device 100 is used to provide electrical energy.

[0163] The electrical equipment in the embodiment of the present application has all the beneficial effects of the battery device 100 in the first aspect. For details, please refer to the specific description of the battery device 100 in the above embodiments, which will not be repeated in this embodiment.

[0164] An embodiment of the present application provides a battery device 100, including a plurality of battery cells 10 and an isolation member 20. The plurality of battery cells 10 are arranged along a thickness direction X of the battery cells 10. The battery cells 10 include two first surfaces 11 arranged opposite to each other along the thickness direction X. The first surface 11 includes a central area 111 and an edge area 112 arranged around the central area 111. The isolation member 20 is arranged between the edge areas 112 of the first surfaces 11 of adjacent battery cells 10, and is respectively fixed to the edge areas 112 of adjacent battery cells 10.

[0165] Among them, an isolation member 20 is arranged between every two battery cells 10. In the first direction Y and the second direction Z, the isolation members 20 are arranged symmetrically, and the thickness direction X, the first direction Y and the second direction Z are arranged to intersect each other. The first surface 11 is rectangular, and the isolation member 20 includes four isolation sub-members 21, and the four isolation sub-members 21 are respectively arranged at the four corners of the first surface 11; the size of each isolation sub-member 21 in the first direction Y is L5, and the size in the second direction Z is L6, 0.05≤L5 / L2≤0.1, 0.05≤L6 / L4≤0.1.

[0166] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A plurality of battery cells, wherein the plurality of battery cells are arranged in a row along a thickness direction of the battery cells, wherein the battery cells include two first surfaces arranged opposite to each other along the thickness direction, wherein the first surfaces include a central region and an edge region arranged around the central region; The isolating member is disposed between the edge regions of the first surfaces of adjacent battery cells and is respectively fixed to the edge regions of adjacent battery cells. The tensile strength of the isolating member is greater than or equal to the connection strength between the isolating member and the battery cells.

2. The battery device according to claim 1, characterized in that: The isolating member is disposed between each of the adjacent battery cells, and the isolating member is connected to two adjacent battery cells at two opposite sides in the thickness direction.

3. The battery device according to claim 1, characterized in that: The connection strength between the separator and the battery cell is greater than or equal to 10 MPa.

4. The battery device according to claim 3, characterized in that: The connection strength between the separator and the battery cell is greater than or equal to 50 MPa.

5. The battery device according to claim 1, characterized in that: The isolation member is connected to the battery cell by bonding or welding.

6. The battery device according to claim 1, characterized in that: The elastic modulus of the isolation element is greater than or equal to 1 GPa.

7. The battery device according to claim 1, characterized in that: In the thickness direction, the size of the spacer is 0.5 mm-3 mm.

8. The battery device according to claim 1, characterized in that: In the first direction and the second direction, the isolation members are symmetrically arranged, and the thickness direction, the first direction and the second direction are arranged to intersect each other.

9. The battery device according to claim 8, characterized in that: In the first direction, the size of the central area is L1, and the size of the first surface is L2; ​​in the second direction, the size of the central area is L3, and the size of the first surface is L4; 0.7≤L1 / L2≤0.95, 0.7≤L3 / L4≤0.

95.

10. The battery device according to claim 9, characterized in that: The isolating element includes a plurality of isolating sub-elements, and the plurality of isolating sub-elements are arranged at intervals along the circumference of the edge region.

11. The battery device according to claim 10, characterized in that: The first surface is rectangular, and the isolation element includes four isolation sub-elements, and the four isolation sub-elements are respectively arranged at the four corners of the first surface; The dimension of each of the isolation sub-components in the first direction is L5, and the dimension of each of the isolation sub-components in the second direction is L6, 0.05≤L5 / L2≤0.1, 0.05≤L6 / L4≤0.

1.

12. The battery device according to claim 10, characterized in that: The isolating sub-component has a first edge facing the central area and a second edge away from the central area, the first edge is arc-shaped and is recessed in a direction away from the central area, and the second edge is arranged in a conformal manner with the edge of the first surface.

13. The battery device according to claim 10, characterized in that: L2>L4, the plurality of isolation sub-components extend along the first direction and are arranged opposite to each other in the second direction, and the extension dimension of each isolation sub-component in the first direction is L7, and the extension dimension in the second direction is L8; 0.8≤L7 / L2≤1, 0.05≤L8 / L4≤0.

1.

14. The battery device according to claim 9, characterized in that: The isolating member extends in a ring shape, and along the thickness direction, the orthographic projection of the isolating member on the first surface surrounds the central area, and the isolating member includes two first sections extending along the first direction and two second sections extending along the second direction; The size of the first section in the second direction is L9, the size of the second section in the first direction is L10, 0.05≤L10 / L2≤0.1, 0.05≤L9 / L4≤0.

1.

15. The battery device according to claim 1, characterized in that: The battery cell comprises a shell and an electrode assembly arranged in the shell, the electrode assembly comprises an electrode body and a tab, and along the thickness direction, an edge of the orthographic projection of the electrode body and an edge of the orthographic projection of the isolation member are staggered.

16. The battery device according to claim 1, characterized in that: The battery device also includes an end plate and an end insulator, wherein the end plate is arranged on at least one side of the plurality of battery cells in the thickness direction, the end insulator is arranged between the edge area of ​​the battery cell and the end plate, and the opposite sides of the end insulator are respectively fixed to the end plate and the battery cell.

17. The battery device according to claim 1, characterized in that: The battery device further includes a heat management component, which is at least partially disposed between the central regions of adjacent battery cells.

18. An electrical equipment, characterized in that: The invention comprises a battery device as claimed in any one of claims 1 to 17, wherein the battery device is used to provide electrical energy.

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