Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, and belongs to the technical field of batteries, and the battery device comprises a battery monomer assembly and a buffer assembly. The battery monomer assembly comprises a plurality of battery monomers arranged along a first direction; the buffer assembly is arranged between two adjacent battery monomers; the buffering assembly comprises a second buffering piece and a first buffering piece, the second buffering piece is arranged on the outer side of the first buffering piece, and the compression strength of the second buffering piece is larger than that of the first buffering piece. According to the technical scheme, the reliability of the battery device can be improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a battery device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are 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 advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] How to improve the reliability of battery devices is an urgent problem to be solved in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can improve the reliability of the battery device.

[0005] In a first aspect, an embodiment of the present application provides a battery device, comprising a battery cell assembly and a buffer assembly. The battery cell assembly comprises a plurality of battery cells arranged along a first direction; the buffer assembly is disposed between two adjacent battery cells; wherein the buffer assembly comprises a second buffer and a first buffer, the second buffer being disposed outside the first buffer, and the compression strength of the second buffer being greater than the compression strength of the first buffer.

[0006] In the above technical solution, the buffer assembly includes a second buffer member and a first buffer member, the second buffer member is arranged on the outside of the first buffer member, and the compression strength of the second buffer member is greater than the compression strength of the first buffer member; on the one hand, when the hoisting fixture clamps and transports the battery cell assembly of the battery device, thereby applying a squeezing force to the first buffer member so that the first buffer member has a tendency to deform, since the compression strength of the second buffer member is greater than the compression strength of the first buffer member, the second buffer member can withstand the squeezing force of the hoisting fixture on the buffer assembly, thereby reducing the risk of deformation of the buffer assembly causing deformation of the battery cell assembly, thereby reducing the risk of deformation of the battery cell assembly of the battery device and improving the reliability of the battery cell; on the other hand, the battery in the battery cell assembly When the battery cell expands due to long-term use, the expansion of the surrounding side of the wall portion of the battery cell shell provided with a buffer assembly is limited because the surrounding side of the wall portion is connected to other wall portions. Therefore, the main expansion area of ​​the wall portion provided with the buffer assembly is close to the middle part of the wall portion provided with the buffer assembly. Since the second buffer component is arranged on the outside of the first buffer component, the battery cell preferentially squeezes the first buffer component when it expands. At the same time, since the compression strength of the first buffer component is less than the extrusion strength of the second buffer component, when the battery cell generates an extrusion force on the buffer assembly due to expansion, the first buffer component is more easily compressed than the second buffer component, thereby giving the battery cell expansion space, thereby reducing the risk of excessive internal pressure of the battery cell, and thereby improving the reliability of the battery cell.

[0007] In some embodiments, along the second direction, the first buffer member has a first sub-frame and a second sub-frame that are oppositely arranged, the second buffer member is arranged on the outer side of the first sub-frame, and the first direction is perpendicular to the second direction.

[0008] In the above technical scheme, the second buffer is arranged on the outside of the first sub-frame. On the one hand, when the lifting fixture clamps the battery cell assembly on the side close to the first sub-frame in the second direction to apply an extrusion force to the first sub-frame, so that the first sub-frame has a tendency to deform, since the compression strength of the second buffer is greater than the compression strength of the first buffer, the second buffer can withstand the extrusion force of the lifting fixture on the buffer assembly, thereby reducing the risk of deformation of the buffer assembly causing deformation of the battery cell assembly, thereby reducing the risk of deformation of the battery cell assembly of the battery device and improving the reliability of the battery cell; on the other hand, compared with the situation where the second buffer is wrapped around the outer peripheral side of the first buffer, arranging the second buffer outside the first sub-frame can reduce the material used for the second buffer, thereby combining the specific design requirements of the battery cell and comprehensively considering the specific design requirements of the battery cell, so that the buffer assembly has good anti-lifting deformation performance while having a lower manufacturing cost, balancing the performance and cost of the battery cell.

[0009] In some embodiments, along the third direction, the first buffer member has a third sub-frame and a fourth sub-frame that are relatively arranged, the first sub-frame, the fourth sub-frame, the third sub-frame and the second sub-frame are connected in sequence, and the first direction, the second direction and the third direction are perpendicular to each other.

[0010] In the above technical solution, the first sub-frame, the fourth sub-frame, the third sub-frame and the second sub-frame are connected in sequence to form a frame shape. On the one hand, the integrity of the first buffer component is improved to facilitate the assembly of the buffer assembly; on the other hand, the middle part of the first buffer component can have an accommodating space for the battery cell to expand, thereby reducing the pressure inside the battery cell and improving the reliability of the battery device.

[0011] In some embodiments, the battery cell includes a shell, an electrode assembly and an electrode terminal; the shell has a first wall in the second direction; the electrode assembly is accommodated in the shell; the electrode terminal is arranged on the first wall and is electrically connected to the electrode assembly; wherein, along the second direction, the first sub-frame is close to the first wall relative to the second sub-frame.

[0012] In the above technical solution, the first sub-frame is closer to the first wall relative to the second sub-frame, so that when the lifting clamp clamps the battery cell assembly in the second direction close to the side of the first sub-frame to apply an extrusion force to the first sub-frame, and the first sub-frame has a tendency to deform, since the compression strength of the second buffer component is greater than the compression strength of the first buffer component, the second buffer component can withstand the extrusion force of the lifting clamp on the buffer assembly, thereby reducing the risk of deformation of the buffer assembly causing deformation of the battery cell assembly, thereby improving the flatness of the first wall of multiple battery cells in the battery cell assembly, and since the electrode terminal is arranged on the first wall, the electrode terminal has a better working environment for output current or input current.

[0013] In some embodiments, the battery device further includes a busbar that connects the electrode terminals of adjacent battery cells.

[0014] In the above technical solution, the first sub-frame is closer to the first wall relative to the second sub-frame, so that when the lifting fixture clamps the battery cell assembly on the side close to the first sub-frame in the second direction to apply an extrusion force to the first sub-frame, which makes the first sub-frame have a deformation tendency, the risk of deformation of the battery cell assembly is reduced, thereby improving the flatness of the first wall of multiple battery cells in the battery cell assembly, thereby reducing the deformation of the connection between the busbar and the electrode terminal caused by the reduced flatness of the first wall of multiple battery cells in the battery cell assembly during the lifting process, improving the reliability of the connection between the busbar and the electrode terminal, and improving the reliability of the battery cell.

[0015] In some embodiments, the housing includes a shell and an end cover, the shell has a first opening, the end cover is connected to the shell and covers the first opening, and the first wall is the end cover.

[0016] In the above technical solution, the outer shell is set as a split structure including a shell and an end cover, and a first opening is set on the shell, so that the electrode assembly can be placed into the shell through the first opening, and the first opening is sealed by the end cover to close the interior of the shell, thereby providing the electrode assembly with a stable working environment.

[0017] In some embodiments, there are multiple second buffer members, and the multiple second buffer members are arranged at intervals along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0018] In the above technical solution, there are multiple second buffer members, and the multiple second buffer members are arranged at intervals along the third direction. Therefore, compared with the situation where one second buffer member extends from one end of the first sub-frame in the third direction to the other end of the first sub-frame, the material consumption of the second buffer member is reduced. Therefore, combined with the specific design requirements of the battery cell, comprehensive consideration is taken to ensure that the buffer assembly has good anti-lifting deformation performance while having a lower manufacturing cost, thereby balancing the performance and cost of the battery cell.

[0019] In some embodiments, the number of the second buffer members is two, and the two second buffer members are spaced apart to form a avoiding portion, and the avoiding portion corresponds to a middle position of the first sub-frame in the third direction.

[0020] In the above technical solution, since the wall portion of the shell of the battery cell is provided with a buffer assembly and is connected to other wall portions at both ends in the third direction, the expansion of the wall portion close to the two ends in the third direction is limited. Therefore, the main expansion area of ​​the wall portion provided with the buffer assembly is close to the middle part of the wall portion provided with the buffer assembly in the third direction. Therefore, when the battery cell expands, the middle part of the first sub-frame in the third direction will be driven to deform along the second direction. The avoidance portion corresponds to the middle position of the first sub-frame in the third direction, so that when the middle part of the first sub-frame in the third direction is deformed along the second direction, the size of the area where the second buffer is deformed along the third direction by the first sub-frame is reduced, thereby reducing the risk of the second buffer abutting against the end cover due to deformation, resulting in cracking at the connection between the end cover and the shell, thereby improving the reliability of the battery device.

[0021] In some embodiments, the second buffer is in a strip shape, a length direction of the second buffer is parallel to a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0022] In the above technical solution, the second buffer is in a strip shape, has a regular structure and is easy to manufacture.

[0023] In some embodiments, the buffer assembly further includes a first adhesive layer, and the first sub-frame and the second buffer are adhered to the battery cell through the first adhesive layer.

[0024] In the above technical solution, a first adhesive layer is provided, and the first sub-frame and the second buffer are bonded to the battery cell through the first adhesive layer. On the one hand, the first buffer and the second buffer are connected by the first adhesive layer, thereby improving the integrity of the buffer assembly. On the other hand, the first buffer and the second buffer can be bonded to the battery cell at the same time through one bonding operation, thereby improving the assembly efficiency of the buffer assembly.

[0025] In some embodiments, the buffer assembly further includes a second adhesive layer, and the second sub-frame is bonded to the battery cell through the second adhesive layer.

[0026] In the above technical solution, the provision of the second adhesive layer can further improve the connection stability between the first buffer component and the battery cell.

[0027] In some embodiments, the battery device also includes a first box body and a second box body; at least part of the battery cell assembly is accommodated in the first box body, the first box body includes a bottom wall, the bottom wall is used to support the battery cell assembly along the second direction, and a second opening is provided on the side of the first box body away from the bottom wall; the second box body is connected to the first box body to cover the second opening; wherein, along the second direction, the first sub-frame is away from the bottom wall relative to the second sub-frame.

[0028] In the above technical solution, the bottom wall is used to support the battery cell assembly along the second direction, and a second opening is provided on the side of the first box body away from the bottom wall, so as to facilitate the lifting assembly to clamp one end of the battery cell assembly in the second direction and place the battery cell assembly in the first box body along the second direction, thereby improving the assembly efficiency of the battery device.

[0029] In some embodiments, the first buffer member is plate-shaped.

[0030] In the above technical solution, the first buffer is a plate-shaped structure which is simple and easy to manufacture, thereby helping to reduce the manufacturing cost of the battery device.

[0031] In some embodiments, the first buffer member is made of one of silicone foam and microporous foamed polypropylene.

[0032] In the above technical solution, silicone foam and microporous foamed polypropylene have good insulation and low compression strength. The material of the first buffer component is one of silicone foam and microporous foamed polypropylene, which can reduce the risk of internal short circuit of the battery cell assembly. When the battery cell expands and generates squeezing pressure on the buffer assembly, the first buffer component is more easily compressed, thereby giving the battery cell expansion space, thereby reducing the risk of excessive internal pressure of the battery cell, and thus improving the reliability of the battery cell.

[0033] In some embodiments, the second buffer member is made of one of melamine and silicone rubber.

[0034] In the above technical scheme, melamine and silicone rubber have good insulation properties and high compression strength. The material of the second buffer component is one of melamine and silicone rubber, which can reduce the risk of internal short circuit of the battery cell assembly. When the lifting fixture clamps and transports the battery cell assembly of the battery device, thereby applying extrusion pressure to the first buffer component and causing the first buffer component to have a tendency to deform, the second buffer component can withstand the extrusion pressure of the lifting fixture on the buffer component, thereby reducing the risk of deformation of the buffer assembly causing deformation of the battery cell assembly, thereby reducing the risk of deformation of the battery cell assembly of the battery device and improving the reliability of the battery cell.

[0035] In a second aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery device, wherein the battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0038] Figure 2 A schematic diagram of the structure of a battery device provided in some embodiments of the present application;

[0039] Figure 3 An exploded view of the structure of a battery cell assembly provided in some embodiments of the present application;

[0040] Figure 4 A schematic diagram of the structure of a buffer assembly provided in some embodiments of the present application;

[0041] Figure 5A schematic diagram of the structure of a battery cell and a buffer assembly provided in some embodiments of the present application;

[0042] Figure 6 for Figure 5 Sectional view of AA in the middle;

[0043] Figure 7 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0044] Figure 8 An exploded view of the structure of a buffer assembly provided in some embodiments of the present application;

[0045] Fig. 9 A schematic structural diagram of another buffer assembly provided for some embodiments of the present application.

[0046] Icons: 1000-vehicle; 100-battery device; 10-box; 11-first box body; 111-bottom wall; 12-second box body; 20-battery cell assembly; 21-battery cell; 211-housing; 2111-first wall; 211A-housing; 211B-end cover; 212-electrode assembly; 213-electrode terminal;

[0047] 22-buffer assembly; 220-avoidance portion; 221-first buffer member; 2211-first sub-frame; 2212-second sub-frame; 2213-third sub-frame; 2214-fourth sub-frame; 222-second buffer member; 223-first adhesive layer; 224-second adhesive layer;

[0048] 23- busbar;

[0049] 200 - controller; 300 - motor; X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application 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 drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0052] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places 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.

[0053] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0055] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0056] The term “plurality” used in this application refers to two or more (including two).

[0057] 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.

[0058] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0059] In the related art, a battery cell generally includes an outer shell and an electrode assembly. The outer shell may include a shell and an end cover. The shell has an opening. After the electrode assembly is loaded into the shell, the opening of the shell can be closed by the end cover to form an enclosed space inside the shell to accommodate the electrode assembly.

[0060] 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 released back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0061] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0062] In some embodiments, the electrode assembly is a laminate structure.

[0063] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0064] 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.

[0065] The shell is used to encapsulate the electrode assembly and electrolyte and other components. 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.

[0066] As an example, the battery cell may 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.

[0067] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0068] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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 10 can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0073] 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.

[0074] The following will mainly focus on the rectangular battery cell. It should be understood that the embodiments described below are also applicable to the cylindrical battery cell or the soft-pack battery cell 21 or the blade battery cell in some aspects.

[0075] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0076] A buffer assembly 22 is generally provided between two adjacent battery cells 21 in a common battery cell assembly 20. The buffer assembly 22 is used to be compressed when the battery cell 21 expands to provide space for the battery cell 21 to expand, thereby reducing the risk of excessive pressure in the battery cell 21. During the transportation and assembly process of the battery cell assembly 20 of the battery device 100, it is often necessary to use a lifting fixture to clamp the battery cell assembly 20 to facilitate the transportation of the battery cell assembly 20. During this period, the lifting fixture needs to apply a certain pressure to the battery cell assembly 20 so that there is a certain friction between the lifting fixture and the battery cell assembly 20 to limit the movement of the battery cell assembly 20 relative to the lifting fixture. However, the above-mentioned pressure may cause the side of the buffer assembly 22 in the battery cell assembly 20 close to the clamping point of the lifting clamp to be compressed relative to the side away from the clamping point of the lifting clamp, thereby causing local deformation of the battery cell assembly 20. On the one hand, it will affect the assembly of the battery cell assembly 20 in the battery device 100; on the other hand, it will make the distance between two adjacent battery cells 21 in the battery cell assembly 20 in the area close to the clamping point of the lifting clamp smaller, and then when the battery cell 21 expands after long-term use, the two adjacent battery cells 21 are more likely to abut each other, thereby increasing the pressure inside the battery cell 21, thereby reducing the reliability of the battery device 100.

[0077] Based on the above considerations, in order to improve the reliability of the battery device 100, the embodiment of the present application provides a battery device 100, including a battery cell assembly 20 and a buffer assembly 22. The battery cell assembly 20 includes a plurality of battery cells 21 arranged along a first direction X; the buffer assembly 22 is disposed between two adjacent battery cells 21; wherein the buffer assembly 22 includes a second buffer member 222 and a first buffer member 221, the second buffer member 222 is disposed outside the first buffer member 221, and the compression strength of the second buffer member 222 is greater than the compression strength of the first buffer member 221.

[0078] In the battery device 100 of this structure, the buffer assembly 22 includes a second buffer member 222 and a first buffer member 221. The second buffer member 222 is arranged on the outside of the first buffer member 221, and the compressive strength of the second buffer member 222 is greater than the compressive strength of the first buffer member 221. On the one hand, when the hoisting fixture clamps and transports the battery cell assembly 20 of the battery device 100, thereby applying a squeezing force to the first buffer member 221 so that the first buffer member 221 has a tendency to deform, since the compressive strength of the second buffer member 222 is greater than the compressive strength of the first buffer member 221, the second buffer member 222 can withstand the squeezing force of the hoisting fixture on the buffer assembly 22, thereby reducing the risk of deformation of the buffer assembly 22 causing deformation of the battery cell assembly 20, thereby reducing the risk of deformation of the battery cell assembly 20 of the battery device 100 and improving the reliability of the battery cell 21. On the other hand, in the battery cell When the battery cell 21 in the assembly 20 expands due to long-term use, the expansion of the surrounding side of the wall portion of the buffer assembly 22 is limited because the outer shell 211 of the battery cell 21 is connected to other wall portions. Therefore, the main expansion area of ​​the wall portion with the buffer assembly 22 is close to the middle of the wall portion with the buffer assembly 22. Since the second buffer member 222 is arranged on the outside of the first buffer member 221, the battery cell 21 preferentially squeezes the first buffer member 221 when it expands. At the same time, since the compression strength of the first buffer member 221 is less than the compression strength of the second buffer member 222, when the battery cell 21 generates a squeezing force on the buffer assembly 22 due to expansion, the first buffer member 221 is more easily compressed than the second buffer member 222, thereby giving the battery cell 21 expansion space, thereby reducing the risk of excessive internal pressure of the battery cell 21, and thereby improving the reliability of the battery cell 21.

[0079] The technical solution described in the embodiment of the present application is applicable to the battery device 100 and an electrical device using the battery device 100 .

[0080] The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0081] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 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 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail 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 or a power source for the vehicle 1000, etc. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0082] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source or a usage power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0083] Please refer to Figure 2 and Figure 3 , and please refer to Figure 4 , Figure 2 This is a schematic diagram of the structure of a battery device 100 provided in some embodiments of the present application. Figure 3 The structure explosion diagram of the battery cell assembly 20 provided in some embodiments of the present application is as follows: Figure 4 A schematic diagram of the structure of a buffer assembly 22 provided for some embodiments of the present application. The embodiment of the present application provides a battery device 100 including a battery cell assembly 20 and a buffer assembly 22. The battery cell assembly 20 includes a plurality of battery cells 21 arranged along a first direction X; the buffer assembly 22 is disposed between two adjacent battery cells 21; wherein the buffer assembly 22 includes a second buffer member 222 and a first buffer member 221, the second buffer member 222 is disposed on the outside of the first buffer member 221, and the compression strength of the second buffer member 222 is greater than the compression strength of the first buffer member 221.

[0084] In order to meet different power usage requirements, the battery device 100 may include a plurality of battery cells 21, wherein the plurality of battery cells 21 may be connected in series, in parallel, or in a hybrid connection, wherein the hybrid connection refers to a mixture of series and parallel connections. The battery device 100 may also be referred to as a battery pack. Optionally, a plurality of battery cells 21 may first be connected in series, in parallel, or in a hybrid connection to form a battery cell assembly 20, and a plurality of battery cell assemblies 20 may then be connected in series, in parallel, or in a hybrid connection to form a battery device 100. In other words, a plurality of battery cells 21 may directly form a battery device 100, or may first form a battery cell assembly 20, and the battery cell assembly 20 may then form a battery device 100.

[0085] According to different power requirements, the number of battery cells 21 in the battery cell assembly 20 can be set to any value. Multiple battery cells 21 can be connected in series, parallel or mixed to achieve a larger capacity or power. Since the number of battery cells 21 included in each battery device 100 may be large, in order to facilitate installation, the battery cells 21 can be arranged in groups, and each group of battery cells 21 constitutes a battery cell assembly 20. The number of battery cells 21 included in the battery cell assembly 20 is not limited and can be set according to requirements. The battery device 100 may include multiple battery cell assemblies 20, and these battery cell assemblies 20 can be connected in series, parallel or mixed.

[0086] The first direction X is the arrangement direction of the battery cells 21 . Exemplarily, the first direction X may be parallel to the thickness direction of the buffer assembly 22 .

[0087] In some embodiments, on a plane perpendicular to the first direction X, the orthographic projection of the battery cell 21 covers the orthographic projection of the buffer assembly 22 .

[0088] In some embodiments, the first buffer 221 contacts two adjacent battery cells 21 .

[0089] In some embodiments, the second buffer 222 contacts two adjacent battery cells 21 .

[0090] In some embodiments, the second buffer member 222 is disposed around the outer circumference of the first buffer member 221 .

[0091] In some other embodiments, the second buffer member 222 is disposed on one side of the first buffer member 221 .

[0092] In some embodiments, the first buffer member 221 is in contact with the second buffer member 222. Such a configuration enables the first buffer member 221 and the second buffer member 222 to support each other as a whole, thereby improving the structural stability of the buffer assembly 22 and reducing the risk of part of the buffer assembly 22 being squeezed out between two adjacent battery cells 21.

[0093] In some other embodiments, there is a gap between the first buffer member 221 and the second buffer member 222 .

[0094] For example, the first buffer member 221 may be in the form of a polygon such as a triangular shape, a quadrilateral, or a pentagon. Figure 4 and Figure 3 An embodiment in which the first buffer member 221 is quadrilateral is shown.

[0095] In some embodiments, please refer to Figure 4The first buffer member 221 may be in the shape of a frame. This configuration allows the middle portion of the first buffer member 221 to accommodate the expanded portion of the battery cell 21 , thereby reducing the risk of excessive internal pressure of the battery cell 21 .

[0096] The compressive strength refers to the maximum stress that a material can withstand before deformation occurs under pressure. The compressive strength of the second buffer 222 is greater than that of the first buffer 221. This means that when subjected to external force, the second buffer 222 is less likely to deform than the first buffer 221.

[0097] In the present embodiment, the buffer assembly 22 includes a second buffer member 222 and a first buffer member 221, the second buffer member 222 is arranged on the outside of the first buffer member 221, and the compressive strength of the second buffer member 222 is greater than the compressive strength of the first buffer member 221; on the one hand, when the hoisting fixture clamps and transports the battery cell assembly 20 of the battery device 100, thereby applying a squeezing force to the first buffer member 221 so that the first buffer member 221 has a tendency to deform, since the compressive strength of the second buffer member 222 is greater than the compressive strength of the first buffer member 221, the second buffer member 222 can withstand the squeezing force of the hoisting fixture on the buffer assembly 22, thereby reducing the risk of deformation of the buffer assembly 22 causing deformation of the battery cell assembly 20, thereby reducing the risk of deformation of the battery cell assembly 20 of the battery device 100, and improving the reliability of the battery cell 21; on the other hand, in the battery cell assembly 20 When the battery cell 21 in the battery cell 21 expands due to long-term use, the peripheral side of the wall portion of the buffer component 22 provided on the shell 211 of the battery cell 21 is connected to other wall portions, thereby limiting the expansion of the peripheral side of the wall portion. Therefore, the main expansion area of ​​the wall portion provided with the buffer component 22 is close to the middle part of the wall portion provided with the buffer component 22. Since the second buffer component 222 is provided on the outside of the first buffer component 221, the battery cell 21 preferentially squeezes the first buffer component 221 when expanding. At the same time, since the compression strength of the first buffer component 221 is less than the compression strength of the second buffer component 222, when the battery cell 21 generates a squeezing force on the buffer component 22 due to expansion, the first buffer component 221 is more easily compressed than the second buffer component 222, thereby giving the battery cell 21 expansion space, thereby reducing the risk of excessive internal pressure of the battery cell 21, thereby improving the reliability of the battery cell 21.

[0098] According to some embodiments of this application, please refer to Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the structure of a battery cell 21 and a buffer assembly 22 provided in some embodiments of the present application. Figure 6 for Figure 5Along the second direction Y, the first buffer member 221 has a first sub-frame 2211 and a second sub-frame 2212 that are arranged opposite to each other, the second buffer member 222 is arranged outside the first sub-frame 2211, and the first direction X is perpendicular to the second direction Y.

[0099] The second direction Y is a direction perpendicular to the first direction X. For example, the second direction Y may be parallel to a height direction of the battery cell 21 .

[0100] In some embodiments, please refer to Figure 6 The first buffer member 221 is frame-shaped, and has a first sub-frame 2211 and a second sub-frame 2212 that are oppositely arranged in the second direction Y.

[0101] In this embodiment, the second buffer member 222 is arranged on the outer side of the first sub-frame 2211. On the one hand, when the lifting fixture clamps the battery cell assembly 20 on the side close to the first sub-frame 2211 in the second direction Y to apply an extrusion force to the first sub-frame 2211, so that the first sub-frame 2211 has a tendency to deform, since the compression strength of the second buffer member 222 is greater than the compression strength of the first buffer member 221, the second buffer member 222 can withstand the extrusion force of the lifting fixture on the buffer assembly 22, thereby reducing the deformation of the buffer assembly 22 and causing the battery cell assembly 20 On the other hand, compared with the case where the second buffer component 222 is wrapped around the outer peripheral side of the first buffer component 221, the second buffer component 222 is arranged outside the first sub-frame 2211, so that the material of the second buffer component 222 can be reduced. In combination with the specific design requirements of the battery cell 21, comprehensive consideration is taken to ensure that the buffer assembly 22 has good anti-lifting deformation performance while having a lower manufacturing cost, thereby balancing the performance and cost of the battery cell 21.

[0102] According to some embodiments of the present application, along the third direction Z, the first buffer member has a third sub-frame 2213 and a fourth sub-frame 2214 that are relatively arranged, the first sub-frame 2211, the fourth sub-frame 2214, the third sub-frame 2213 and the second sub-frame 2212 are connected in sequence, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0103] The third direction Z is a direction perpendicular to the first direction X. For example, the third direction Z may be parallel to the length direction of the battery cell 21 .

[0104] In this embodiment, the first sub-frame 2211, the fourth sub-frame 2214, the third sub-frame 2213 and the second sub-frame 2212 are connected in sequence to form a frame shape. On the one hand, the integrity of the first buffer member 221 is improved to facilitate the assembly of the buffer assembly 22; on the other hand, an accommodating space is provided between the first sub-frame 2211 and the second sub-frame 2212 to accommodate the expanded portion of the battery cell 21 when the battery cell 21 expands, thereby reducing the pressure inside the battery cell 21 and improving the reliability of the battery device 100.

[0105] According to some embodiments of this application, please refer to Figure 5 and Figure 6 , and please refer to Figure 7 , Figure 7 An exploded view of the structure of a battery cell 21 provided in some embodiments of the present application. The battery cell 21 includes a housing 211, an electrode assembly 212, and an electrode terminal 213; the housing 211 has a first wall 2111 in the second direction Y; the electrode assembly 212 is accommodated in the housing 211; the electrode terminal 213 is disposed on the first wall 2111 and is electrically connected to the electrode assembly 212; wherein, along the second direction Y, the first sub-frame 2211 is closer to the first wall 2111 relative to the second sub-frame 2212.

[0106] In some embodiments, the battery cell 21 includes a housing 211 and one or more electrode assemblies 212. The multiple walls of the housing 211 form a cavity, which can be used to accommodate the electrode assembly 212. The housing 211 is determined according to the shape of the one or more electrode assemblies 212 after being combined. Exemplarily, the housing 211 can be a hollow cuboid, a cube, or a regular polyhedron. The housing 211 is filled with an electrolyte, such as an electrolyte.

[0107] The first wall 2111 is a wall portion of the housing 211 in the second direction Y.

[0108] “Along the second direction Y, the first sub-frame 2211 is closer to the first wall 2111 relative to the second sub-frame 2212” can be understood as on a plane perpendicular to the first direction X, along the second direction Y, the orthographic projection of the first sub-frame 2211 is located between the orthographic projection of the second sub-frame 2212 and the orthographic projection of the first wall 2111.

[0109] In some embodiments, the battery cell 21 includes a housing 211 and an electrode assembly 212 . The electrode assembly 212 is disposed in the housing 211 , and the electrode assembly 212 is a wound structure.

[0110] In some embodiments, the battery cell 21 includes an electrode assembly 212 . The electrode assembly 212 is disposed in the housing 211 , and the electrode assembly 212 is a laminated structure.

[0111] The electrode terminal 213 is a component electrically connected to the electrode assembly 212 to facilitate the extraction of current from the electrode assembly 212 or the introduction of current into the electrode assembly 212. Exemplarily, the number of electrode terminals 213 can be two, and the two electrode terminals 213 can be disposed on the first wall 2111 and arranged along the third direction Z. The two electrode terminals 213 are respectively a positive electrode terminal 213 and a negative electrode terminal 213, wherein the positive electrode terminal 213 is used to be electrically connected to the positive electrode tab of the electrode assembly 212, and the negative electrode terminal 213 is used to be electrically connected to the negative electrode tab of the electrode assembly 212.

[0112] In this embodiment, the first sub-frame 2211 is closer to the first wall 2111 relative to the second sub-frame 2212, so that when the lifting fixture clamps the battery cell assembly 20 on the second direction Y close to the side of the first sub-frame 2211 to apply an extrusion force to the first sub-frame 2211, and the first sub-frame 2211 has a tendency to deform, since the compression strength of the second buffer component 222 is greater than the compression strength of the first buffer component 221, the second buffer component 222 can withstand the extrusion force of the lifting fixture on the buffer assembly 22, thereby reducing the risk of deformation of the buffer assembly 22 causing deformation of the battery cell assembly 20, thereby improving the flatness of the first wall 2111 of multiple battery cells 21 in the battery cell assembly 20, and since the electrode terminal 213 is arranged on the first wall 2111, the electrode terminal 213 has a better working environment for output current or input current.

[0113] According to some embodiments of this application, please refer to Figure 3 The battery device 100 further includes a busbar 23 , which connects the electrode terminals 213 of adjacent battery cells 21 .

[0114] The busbar 23 is a component that can connect multiple battery cells 21 in series or in parallel to achieve electrical connection between the multiple battery cells 21. The busbar 23 may also be called a busbar, a bar or a busbar, and the busbar 23 may be a metal sheet.

[0115] In some embodiments, the busbars 23 are connected to the electrode terminals 213 of the battery cells 21 by welding to connect the plurality of battery cells 21 in series or in parallel.

[0116] In some embodiments, the busbar 23 is connected to the electrode terminal 213 of the battery cell 21 through a conductive adhesive to connect the plurality of battery cells 21 in series or in parallel.

[0117] In this embodiment, the first sub-frame 2211 is closer to the first wall 2111 relative to the second sub-frame 2212, so that when the lifting fixture clamps the battery cell assembly 20 on the side close to the first sub-frame 2211 in the second direction Y to apply an extrusion force to the first sub-frame 2211, so that the first sub-frame 2211 has a deformation tendency, the risk of deformation of the battery cell assembly 20 is reduced, thereby improving the flatness of the first wall 2111 of the multiple battery cells 21 in the battery cell assembly 20, thereby reducing the deformation of the connection between the bus 23 and the electrode terminal 213 caused by the reduction in the flatness of the first wall 2111 of the multiple battery cells 21 in the battery cell assembly 20 during the lifting process, improving the reliability of the connection between the bus 23 and the electrode terminal 213, and improving the reliability of the battery cell 21.

[0118] According to some embodiments of this application, please refer to Figure 5 and Figure 6 , and please refer to Figure 7 The housing 211 includes a shell 211A and an end cover 211B. The shell 211A has a first opening. The end cover 211B is connected to the shell 211A and covers the first opening. The first wall 2111 is the end cover 211B.

[0119] The housing 211A may be a hollow cuboid, cube or regular polyhedron, and one of the faces of the housing 211A has a first opening so that one or more electrode assemblies 212 can be placed in the housing 211A. The housing 211A is filled with electrolyte, such as electrolyte solution.

[0120] The end cap 211B may be in the shape of a flat plate, and the electrode terminal 213 is fixed on the flat surface of the end cap 211B.

[0121] In some embodiments, the end cap 211B is connected to the housing 211A by welding to cover the first opening.

[0122] In this embodiment, the outer shell 211 is configured as a split structure including a shell 211A and an end cover 211B, and a first opening is provided on the shell 211A so that the electrode assembly 212 can be placed into the shell 211A through the first opening. The first opening is sealed by the end cover 211B to close the interior of the shell 211A, thereby providing the electrode assembly 212 with a stable working environment.

[0123] According to some embodiments of this application, please refer to Figure 5 and Figure 6 There are multiple second buffer members 222, and the multiple second buffer members 222 are arranged at intervals along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0124] The third direction Z may be a length direction of the battery cell 21 .

[0125] In some embodiments, please refer to Figure 5 , on a plane perpendicular to the first direction X, the orthographic projection of the second buffer member 222 is located between the orthographic projection of the first buffer member 221 and the orthographic projection of the end cover 211B. A plurality of second buffer members 222 are arranged at intervals along the third direction Z. Thus, relative to the situation where the second buffer member 222 extends from one end of the first sub-frame 2211 in the third direction Z to the other end of the first sub-frame 2211, the area where the second buffer member 222 abuts against the end cover 211B is reduced when the battery cell 21 expands to drive the first sub-frame 2211 and the second buffer member 222 to deform along the second direction Y, thereby reducing the force area on the end cover 211B, and further reducing the risk of cracking at the connection between the shell 211A and the end cover 211B caused by the expansion of the battery cell 21 driving the first sub-frame 2211 and the second buffer member 222 to deform along the second direction Y.

[0126] In this embodiment, there are multiple second buffer members 222, and the multiple second buffer members 222 are arranged at intervals along the third direction Z. Therefore, compared with the situation where the second buffer member 222 extends from one end of the first sub-frame 2211 in the third direction Z to the other end of the first sub-frame 2211, the material used for the second buffer member 222 is reduced. In combination with the specific design requirements of the battery cell 21, comprehensive consideration is taken to ensure that the buffer assembly 22 has good anti-lifting deformation performance while having a lower manufacturing cost, thereby balancing the performance and cost of the battery cell 21.

[0127] According to some embodiments of this application, please refer to Figure 5 and Figure 6 There are two second buffer members 222 , and the two second buffer members 222 are spaced apart to form an avoidance portion 220 . The avoidance portion 220 corresponds to the middle position of the first sub-frame 2211 in the third direction Z.

[0128] In the present embodiment, since the wall portion of the shell 211 of the battery cell 21 provided with the buffer component 22 is connected to other wall portions at both ends in the third direction Z, the expansion of the area of ​​the wall portion close to its two ends in the third direction Z is limited. Therefore, the main expansion area of ​​the wall portion provided with the buffer component 22 is close to the middle part of the wall portion provided with the buffer component 22 in the third direction Z. Therefore, when the battery cell 21 expands, the middle part of the first sub-frame 2211 in the third direction Z will be driven to deform along the second direction Y. The avoidance portion 220 corresponds to the middle position of the first sub-frame 2211 in the third direction Z. Therefore, when the middle part of the first sub-frame 2211 in the third direction Z is deformed along the second direction Y, the size of the area where the second buffer component 222 is deformed along the third direction Z by the first sub-frame 2211 is reduced, thereby reducing the risk of the second buffer component 222 abutting against the end cover 211B due to deformation, resulting in cracking at the connection between the end cover 211B and the shell 211A, thereby improving the reliability of the battery device 100.

[0129] According to some embodiments of this application, please refer to Figure 5 and Figure 6 The second buffer member 222 is in a strip shape, and the length direction of the second buffer member 222 is parallel to the third direction Z, and the first direction X, the second direction Y and the third direction are perpendicular to each other.

[0130] For example, the second buffer member 222 may be in a prism shape, a cylinder shape, a semi-cylindrical shape, or the like.

[0131] In some embodiments, the second buffer 222 is a rectangular parallelepiped, the length direction of the second buffer 222 is parallel to the third direction Z, the width direction of the second buffer 222 is parallel to the first direction X, and the thickness direction of the second buffer 222 is parallel to the second direction Y. The first buffer 221 contacts the second buffer 222 along the second direction Y. Such a configuration increases the contact area between the first buffer 221 and the second buffer 222 as a whole, further improves the structural stability of the buffer assembly 22, and helps to reduce the risk of a portion of the buffer assembly 22 being squeezed out between two adjacent battery cells 21.

[0132] In this embodiment, the second buffer member 222 is in a strip shape, has a regular structure, and is easy to manufacture.

[0133] According to some embodiments of this application, please refer to Figure 8 , Figure 8 The structure of the buffer assembly 22 provided in some embodiments of the present application is an exploded view. The buffer assembly 22 further includes a first adhesive layer 223 , and the first sub-frame 2211 and the second buffer member 222 are bonded to the battery cell 21 through the first adhesive layer 223 .

[0134] In some embodiments, a first adhesive layer 223 is disposed on one side of the first sub-frame 2211 and the second buffer member 222 in the first direction X, and the first sub-frame 2211 and the second buffer member 222 are bonded to one of the two adjacent battery cells 21 through the first adhesive layer 223 .

[0135] In some embodiments, first adhesive layers 223 are disposed on both sides of the first sub-frame 2211 and the second buffer member 222 in the first direction X, and the first sub-frame 2211 and the second buffer member 222 are respectively bonded to two adjacent battery cells 21 through the two first adhesive layers 223 .

[0136] In some embodiments, the first adhesive layer 223 may be the sticky portion remaining after the double-sided adhesive tape is separated from the release paper.

[0137] In some embodiments, the first adhesive layer 223 may be an adhesive layer formed of colloid.

[0138] In some embodiments, the first adhesive layer 223 may be rectangular.

[0139] In this embodiment, by providing a first adhesive layer 223, and making the first buffer member 221 and the second buffer member 222 bonded to the battery cell 21 through the first adhesive layer 223, on the one hand, the first buffer member 221 and the second buffer member 222 are connected by the first adhesive layer 223, thereby improving the integrity of the buffer assembly 22; on the other hand, the first buffer member 221 and the second buffer member 222 can be bonded to the battery cell 21 at the same time through one bonding operation, thereby improving the assembly efficiency of the buffer assembly 22.

[0140] According to some embodiments of this application, please refer to Figure 8 The buffer assembly 22 further includes a second adhesive layer 224 , and the second sub-frame 2212 is bonded to the battery cell through the second adhesive layer 224 .

[0141] In some embodiments, a second adhesive layer 224 is disposed on one side of the second sub-frame 2212 in the first direction X, and the second sub-frame 2212 is bonded to one of two adjacent battery cells 21 through the second adhesive layer 224 .

[0142] In some embodiments, second adhesive layers 224 are disposed on both sides of the second sub-frame 2212 in the first direction X. The second sub-frame 2212 is respectively bonded to two adjacent battery cells 21 through the two second adhesive layers 224 .

[0143] In some embodiments, the second adhesive layer 224 may be the sticky portion remaining after the double-sided adhesive tape is separated from the release paper.

[0144] In some embodiments, the second adhesive layer 224 may be an adhesive layer formed of colloid.

[0145] In some embodiments, the second adhesive layer 224 may be rectangular.

[0146] In this embodiment, the provision of the second adhesive layer 224 can further improve the connection stability between the first buffer member 221 and the battery cell 21 .

[0147] According to some embodiments of this application, please refer to Figure 2 The battery device 100 also includes a first box body 11 and a second box body 12; at least part of the battery cell assembly 20 is accommodated in the first box body 11, and the first box body 11 includes a bottom wall 111, which is used to support the battery cell assembly 20 along the second direction Y. A second opening is provided on a side of the first box body 11 away from the bottom wall 111; the second box body 12 is connected to the first box body 11 to cover the second opening; wherein, along the second direction Y, the first sub-frame 2211 is away from the bottom wall 111 relative to the second sub-frame 2212.

[0148] The first box body 11 and the second box body 12 cover each other to form a box body 10, and the first box body 11 and the second box body 12 together define an assembly space for accommodating the battery cell 21. Figure 2 In the embodiment, the bottom wall 111 is a plate of the first box body 11 .

[0149] Optionally, the first box body 11 can be a hollow structure with a second opening at one end, and the second box body 12 can be a plate-like structure, and the second box body 12 covers the second opening of the first box body 11, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also be hollow structures both open on one side, and the open side of the second box body 12 covers the second opening of the first box body 11.

[0150] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a cuboid. Figure 2 In the embodiment, the box body 10 is a rectangular parallelepiped structure.

[0151] In this embodiment, the bottom wall 111 is used to support the battery cell assembly 20 along the second direction Y, and a second opening is provided on the side of the first box body 11 away from the bottom wall 111, so as to facilitate the lifting assembly to clamp one end of the battery cell assembly 20 in the second direction Y and place the battery cell assembly 20 in the first box body 11 along the second direction Y, thereby improving the assembly efficiency of the battery device 100.

[0152] According to some embodiments of this application, please refer to Fig. 9 , Fig. 9 This is a schematic structural diagram of another buffer assembly 22 provided in some embodiments of the present application. The first buffer member 221 is plate-shaped.

[0153] Exemplarily, the length direction of the first buffer 221 is parallel to the third direction Z, the width direction of the first buffer 221 is parallel to the second direction Y, the thickness direction of the first buffer 221 is parallel to the first direction X, and the size of the first buffer 221 in its length direction is greater than the size of the first buffer 221 in its width direction.

[0154] In the above technical solution, the first buffer member 221 is in a plate shape, has a simple structure and is easy to manufacture, thereby helping to reduce the manufacturing cost of the battery device.

[0155] According to some embodiments of the present application, the material of the first buffer component 221 is one of silicone foam and microporous foamed polypropylene.

[0156] When the battery cell 21 expands, it will squeeze the first buffer member 221. The material of the first buffer member 221 is one of silicone foam and microporous foamed polypropylene, so that when the first buffer member 221 is squeezed by the battery cell 21, its internal cavity can be compressed to provide expansion space for the battery cell 21, thereby reducing the risk of excessive internal pressure of the battery cell 21 and further improving the reliability of the battery cell 21.

[0157] In this embodiment, silicone foam and microporous foamed polypropylene have good insulation properties and low compression strength. The material of the first buffer member 221 is one of silicone foam and microporous foamed polypropylene, which can reduce the risk of internal short circuit of the battery cell assembly 20. When the battery cell 21 generates a squeezing force on the buffer assembly 22 due to expansion, the first buffer member 221 is more easily compressed, thereby giving the battery cell 21 expansion space, thereby reducing the risk of excessive internal pressure of the battery cell 21, thereby improving the reliability of the battery cell 21.

[0158] According to some embodiments of the present application, the material of the second buffer member 222 is one of melamine and silicone rubber.

[0159] When hoisting the battery cell assembly 20, the hoisting fixture needs to apply a certain pressure to the battery cell assembly 20 so that there is a certain friction between the hoisting fixture and the battery cell assembly 20 to limit the movement of the battery cell assembly 20 relative to the hoisting fixture. The material of the second buffer 222 is one of melamine and silicone rubber, so that the second buffer 222 has a greater compression strength, thereby reducing the risk of deformation of the battery cell assembly 20 of the battery device 100 and improving the reliability of the battery cell 21.

[0160] In this embodiment, melamine and silicone rubber have good insulation properties and high compression strength. The second buffer component 222 is made of one of melamine and silicone rubber, which can reduce the risk of internal short circuit in the battery cell assembly 20. When the lifting fixture clamps and transports the battery cell assembly 20 of the battery device 100, thereby applying an extrusion force to the first buffer component 221 and causing the first buffer component 221 to have a deformation tendency, the second buffer component 222 can withstand the extrusion force of the lifting fixture on the buffer assembly 22, thereby reducing the risk of deformation of the buffer assembly 22 causing deformation of the battery cell assembly 20, thereby reducing the risk of deformation of the battery cell assembly 20 of the battery device 100 and improving the reliability of the battery cell 21.

[0161] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery device 100 of any of the above solutions, and the battery device 100 is used to provide electrical energy to the electrical device.

[0162] According to some embodiments of the present application, referring to Figures 2 to 8, the embodiment of the present application provides a battery device 100 including a battery cell assembly 20 and a buffer assembly 22. The battery cell assembly 20 includes a plurality of battery cells 21 arranged along a first direction X; the buffer assembly 22 is disposed between two adjacent battery cells 21; wherein the buffer assembly 22 includes a second buffer 222 and a first buffer 221, along a second direction Y, the first buffer 221 has a first sub-frame 2211 and a second sub-frame 2212 disposed opposite to each other, the second buffer 222 is disposed outside the first sub-frame 2211, and the first direction X is perpendicular to the second direction Y. The compression strength of the second buffer 222 is greater than the compression strength of the first buffer 221. The battery cell 21 includes a housing 211, an electrode assembly 212 and an electrode terminal 213; the housing 211 has a first wall 2111 in the second direction Y; the electrode assembly 212 is accommodated in the housing 211; the electrode terminal 213 is arranged on the first wall 2111 and is electrically connected to the electrode assembly 212; wherein, along the second direction Y, the first sub-frame 2211 is closer to the first wall 2111 relative to the second sub-frame 2212. The battery device 100 also includes a busbar 23, which connects the electrode terminals 213 of adjacent battery cells 21. The housing 211 includes a shell 211A and an end cover 211B, the shell 211A has a first opening, the end cover 211B is connected to the shell 211A and covers the first opening, and the first wall 2111 is the end cover 211B. There are two second buffer members 222, and the two second buffer members 222 are spaced apart to form an avoidance portion 220, and the avoidance portion 220 corresponds to the middle position of the first sub-frame 2211 in the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The second buffer member 222 is strip-shaped, and the length direction of the second buffer member 222 is parallel to the third direction Z. The buffer assembly 22 also includes a first adhesive layer 223, and the first buffer member 221 and the second buffer member 222 are bonded to the battery cell 21 through the first adhesive layer 223. The buffer assembly 22 also includes a second adhesive layer 224, and the second sub-frame 2212 is bonded to the battery cell 21 through the second adhesive layer 224. The battery device 100 includes a first box body 11 and a second box body 12; at least part of the battery cell assembly 20 is accommodated in the first box body 11, the first box body 11 includes a bottom wall 111, the bottom wall 111 is used to support the battery cell assembly 20 along the second direction Y, and a second opening is provided on a side of the first box body 11 away from the bottom wall 111; the second box body 12 is connected to the first box body 11 to cover the second opening; wherein, along the second direction Y, the first sub-frame 2211 is away from the bottom wall 111 relative to the second sub-frame 2212. The material of the first buffer 221 is one of silicone foam and microporous foamed polypropylene. The material of the second buffer 222 is one of melamine and silicone rubber.

[0163] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0164] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: A battery cell assembly, comprising a plurality of battery cells arranged along a first direction; A buffer assembly is arranged between two adjacent battery cells; Wherein, the buffer assembly includes a second buffer and a first buffer, the second buffer is arranged on the outside of the first buffer, and the compression strength of the second buffer is greater than the compression strength of the first buffer.

2. The battery device according to claim 1, characterized in that Along the second direction, the first buffer member has a first sub-frame and a second sub-frame that are arranged opposite to each other, the second buffer member is arranged on the outer side of the first sub-frame, and the first direction is perpendicular to the second direction.

3. The battery device according to claim 2, characterized in that: Along the third direction, the first buffer member has a third sub-frame and a fourth sub-frame that are relatively arranged, the first sub-frame, the fourth sub-frame, the third sub-frame and the second sub-frame are connected in sequence, and the first direction, the second direction and the third direction are perpendicular to each other.

4. The battery device according to claim 2, characterized in that: The battery cell comprises: a housing having a first wall in the second direction; an electrode assembly, contained in the housing; an electrode terminal, disposed on the first wall and electrically connected to the electrode assembly; Wherein, along the second direction, the first sub-frame is closer to the first wall relative to the second sub-frame.

5. The battery device according to claim 4, characterized in that: The battery device further comprises: A busbar is provided to connect the electrode terminals of the adjacent battery cells.

6. The battery device according to claim 4, characterized in that: The housing comprises a shell and an end cover, the shell has a first opening, the end cover is connected to the shell and covers the first opening, and the first wall is the end cover.

7. The battery device according to claim 6, characterized in that: There are multiple second buffer members, and the multiple second buffer members are arranged at intervals along the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

8. The battery device according to claim 7, characterized in that: There are two second buffer members, and the two second buffer members are arranged at an interval to form a avoiding portion, and the avoiding portion corresponds to a middle position of the first sub-frame in the third direction.

9. The battery device according to claim 2, characterized in that: The second buffer is in a strip shape, a length direction of the second buffer is parallel to the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

10. The battery device according to claim 2, characterized in that: The buffer assembly further includes a first adhesive layer, and the first sub-frame and the second buffer are adhered to the battery cell through the first adhesive layer.

11. The battery device according to claim 10, characterized in that: The buffer assembly further includes a second adhesive layer, and the second sub-frame is adhered to the battery cell through the second adhesive layer.

12. The battery device according to claim 2, characterized in that: The battery device further comprises: a first box body, wherein at least a portion of the battery cell assembly is accommodated in the first box body, the first box body comprises a bottom wall, the bottom wall is used to support the battery cell assembly along the second direction, and a second opening is provided on a side of the first box body away from the bottom wall; a second box body connected to the first box body to cover the second opening; Wherein, along the second direction, the first sub-frame is away from the bottom wall relative to the second sub-frame.

13. The battery device according to claim 1, wherein: The first buffer is in a plate shape.

14. The battery device according to any one of claims 1 to 13, characterized in that: The first buffer is made of one of silicone foam and microporous foamed polypropylene.

15. The battery device according to any one of claims 1 to 13, characterized in that: The second buffer is made of one of melamine and silicone rubber.

16. An electrical device, characterized in that: The electrical device comprises a battery device as claimed in any one of claims 1 to 15, and the battery device is used to provide electrical energy.

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