Battery device and electric device

Abstract

The application provides a battery device and an electric device. The battery device comprises a box body, a partition and at least two battery cell groups. The partition comprises two first surfaces oppositely arranged in a first direction. The at least two battery cell groups are accommodated in the box body and arranged in the first direction. Each battery cell group comprises a plurality of battery cells arranged in a second direction perpendicular to the first direction. The two ends of each battery cell group in the second direction are respectively abutted against and bonded to the inner surface of the box body. The partition is arranged between any two adjacent battery cell groups. At least one first surface of the partition comprises a first region and a second region connected to each other. The first region is provided with bonding glue, and the partition is bonded to the battery cell group through the bonding glue. The partition is not prone to wrinkling and can stably play a buffering and heat insulation role between the two adjacent battery cell groups, thereby improving the reliability of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Technology

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As the application scope of battery devices continues to expand, people's requirements for the reliability of battery devices are also increasing. How to improve the reliability of battery devices is receiving more and more attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, this application provides a battery device and an electrical device, the battery device having good reliability.

[0005] In a first aspect, some embodiments of this application provide a battery device, which includes a housing, a separator, and at least two battery cell groups. The separator includes two first surfaces disposed opposite each other in a first direction. The at least two battery cell groups are housed in the housing and arranged along the first direction. Each battery cell group includes a plurality of battery cells arranged along a second direction, which is perpendicular to the first direction. The two ends of each battery cell group in the second direction abut against and are bonded to the inner surface of the housing. A separator is disposed between two adjacent battery cell groups. At least one first surface of the separator includes a first region and a second region that are connected to each other. An adhesive is disposed in the first region, and the separator is bonded to the battery cell group by the adhesive.

[0006] In the above structure, since at least one first surface of the separator includes a first region with adhesive, the separator can be bonded to the battery cell assembly via the adhesive, thereby connecting to the battery cell assembly and achieving fixation. Because the first surface including the first region also includes a second region connecting the first region, and the first region with adhesive only occupies a portion of the first surface, the separator is bonded to the battery cell assembly via a portion of the first surface. This ensures that deformation of the separator caused by the compression of multiple battery cells in the battery cell assembly occurs only in the first region. The stress from these deformations can be absorbed by the deformation of the separator in the connected second region at the edge of the first region, reducing the likelihood of wrinkles in the separator. This allows the separator to stably provide buffering and heat insulation between adjacent battery cell assemblies, improving the reliability of the battery device.

[0007] According to some embodiments of the present application, the area of ​​the first region is set to E, the area of ​​the first surface is set to F, and 0.15≤E / F≤0.3.

[0008] According to some embodiments of the present application, a battery device is provided in which a first region protrudes along a first direction to form a raised structure, and an adhesive is disposed on the surface of the raised structure facing the battery cell assembly in the first direction.

[0009] According to some embodiments of the present application, one of the two first surfaces is bonded to the battery cell assembly by an adhesive, and the other surface is abutted and bonded to the battery cell assembly.

[0010] According to some embodiments of the present application, in the battery device, at least a portion of the central axis of the separator overlaps with the orthographic projection of the first region on a plane perpendicular to the first direction.

[0011] According to some embodiments of the present application, the battery device further includes a detector disposed in a separator.

[0012] According to some embodiments of the present application, the battery device is provided with at least two first regions, the at least two first regions are spaced apart, and two adjacent first regions are connected through a second region.

[0013] According to some embodiments of the present application, the battery device has at least two first regions spaced apart along a second direction.

[0014] According to some embodiments of the present application, the battery device includes a separator comprising a main structure and a coating layer, wherein the main structure is a foamed structure and the coating layer covers the outer surface of the main structure.

[0015] Secondly, some embodiments of this application provide an electrical device that includes a battery device provided by any of the above-described technical solutions, the battery device being used to provide electrical energy.

[0016] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects: Some embodiments of this application provide a battery device, which includes a housing, a separator, and at least two battery cell groups. The separator includes two first surfaces disposed opposite each other in a first direction. The at least two battery cell groups are housed in the housing and arranged along the first direction. Each battery cell group includes a plurality of battery cells arranged along a second direction, which is perpendicular to the first direction. The two ends of each battery cell group in the second direction abut against and are bonded to the inner surface of the housing. A separator is disposed between two adjacent battery cell groups. At least one first surface of the separator includes a first region and a second region that are connected to each other. An adhesive is disposed in the first region, and the separator is bonded to the battery cell group by the adhesive.

[0017] In the above structure, since at least one first surface of the separator includes a first region with adhesive, the separator can be bonded to the battery cell assembly via the adhesive, thereby connecting to the battery cell assembly and achieving fixation. Because the first surface including the first region also includes a second region connecting the first region, and the first region with adhesive only occupies a portion of the first surface, the separator is bonded to the battery cell assembly via a portion of the first surface. This ensures that deformation of the separator caused by the compression of multiple battery cells in the battery cell assembly occurs only in the first region. The stress from these deformations can be absorbed by the deformation of the separator in the connected second region at the edge of the first region, reducing the likelihood of wrinkles in the separator. This allows the separator to stably provide buffering and heat insulation between adjacent battery cell assemblies, improving the reliability of the battery device. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of a vehicle provided for some embodiments of this application; Figure 2 This is a schematic diagram showing the disassembled structure of a battery device provided in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of some battery devices provided in some embodiments of this application; Figure 4 This is a split schematic diagram of a portion of the battery device provided in some embodiments of this application; Figure 5 This is a schematic diagram of the structure of the separator provided in some embodiments of this application; Figure 6 This is a schematic diagram of the structure of the separator provided in other embodiments of this application; Figure 7 This is a schematic diagram of the structure of the separator provided in some embodiments of this application; Figure 8 for Figure 7 Cross-sectional view at point GG.

[0019] In the picture: 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Reception space; 7. Battery cell; 70. Battery cell pack; 8. Separator; 81. First surface; 811. First region; 812. Second region; 82. Protruding structure; 83. Main structure; 84. Coating film layer; 9. Adhesive; X, First direction; Y, Second direction. Detailed Implementation

[0020] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0021] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0022] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0023] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0024] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0025] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in energy storage containers or energy storage cabinets. As the application fields of battery devices continue to expand, the usage of battery devices is also constantly increasing.

[0027] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via busbars.

[0028] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0029] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0030] Battery cells can be lithium-ion cells, sodium-ion cells, sodium-lithium-ion cells, lithium metal cells, sodium metal cells, lithium-sulfur cells, magnesium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, etc.

[0031] As an example, a battery cell group can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0032] In some embodiments, the battery device may include one or more battery packs, which may include one or more battery cell groups. As an example, a battery pack includes a housing and one or more battery cell groups, the battery cell groups being housed, for example, in a fixed manner within the housing. As yet another example, the battery device may include multiple battery packs, which may be connected in series, parallel, or in a mixed configuration.

[0033] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the battery cell pack. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0034] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the battery cells.

[0035] In some embodiments, the battery device can be used in an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0036] In battery assembly manufacturing, one approach directly integrates individual battery cells into the battery pack. In this approach, battery cell assemblies, comprising multiple cells, need to be compressed before being loaded into the housing, and they must remain compressed during this process. To improve production efficiency, in some cases, multiple battery cell assemblies need to be compressed and loaded into the housing simultaneously. For improved battery assembly reliability, separators for cushioning and heat insulation are placed between adjacent battery cell assemblies. These separators typically have adhesive on their sides to bond them to adjacent battery cell assemblies, preventing them from easily falling off during loading into the housing.

[0037] However, because the adhesive bonds the sides of the separator to multiple battery cells in the battery pack, compression of these cells can cause deformation in multiple places in the separator, which is bonded by the adhesive. This can easily lead to wrinkles, uneven local compression, or stress concentration in the separator. This not only reduces the buffering and heat insulation performance of the separator, but also makes it easy for the multiple battery cells in the battery pack to experience uneven stress and slight deformation. If these deformations exceed the tolerance range, they can lead to poor welding or internal short circuit risks, which is detrimental to improving the reliability of the battery device.

[0038] To improve the reliability of the battery device, some embodiments of this application provide a battery device including a housing, a separator, and at least two battery cell groups. The separator includes two first surfaces disposed opposite each other in a first direction. The at least two battery cell groups are housed in the housing and arranged along the first direction. Each battery cell group includes a plurality of battery cells arranged along a second direction, which is perpendicular to the first direction. The two ends of each battery cell group in the second direction abut against and are bonded to the inner surface of the housing. A separator is disposed between two adjacent battery cell groups. On a plane perpendicular to the first direction, the orthographic projection of the separator overlaps with at least a portion of the orthographic projection of each battery cell in the battery cell group. At least one first surface of the separator includes a first region and a second region connected to each other. An adhesive is disposed in the first region, and the separator is bonded to the battery cell group by the adhesive.

[0039] In the above structure, since at least one first surface of the separator includes a first region with adhesive, the separator can be bonded to the battery cell assembly via the adhesive, thereby connecting to the battery cell assembly and achieving fixation. Because the first surface including the first region also includes a second region connecting the first region, and the first region with adhesive only occupies a portion of the first surface, the separator is bonded to the battery cell assembly via a portion of the first surface. This ensures that deformation of the separator caused by the compression of multiple battery cells in the battery cell assembly occurs only in the first region. The stress from these deformations can be absorbed by the deformation of the separator in the connected second region at the edge of the first region, reducing the likelihood of wrinkles in the separator. This allows the separator to stably provide buffering and heat insulation between adjacent battery cell assemblies, improving the reliability of the battery device.

[0040] The battery device described in the embodiments of this application is applicable to electrical devices that use battery devices.

[0041] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power 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, etc.

[0042] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0043] Figure 1 A schematic diagram of a vehicle provided for some embodiments of this application.

[0044] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0045] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0046] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0047] Figure 2 This is a schematic diagram showing the disassembled structure of a battery device provided in some embodiments of this application. For example... Figure 2 As shown, the battery device 2 includes a housing 5 and a battery cell assembly 70, which is housed within the housing 5. The battery cell assembly 70 may include multiple battery cells, and the battery elevator may be the smallest unit that makes up the battery.

[0048] The housing 5 is used to accommodate the battery cell pack 70, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a receiving space 5c for accommodating the battery cell pack 70. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, covering the open side of the second housing portion 5b to form a housing 5 with the receiving space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the receiving space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0049] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0050] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0051] Some embodiments of this application provide a battery device, and reference continues... Figure 3 The battery device 2 includes a housing 5, a separator 8, and at least two battery cell groups 70. The separator 8 includes two first surfaces 81 arranged opposite each other in a first direction X. The at least two battery cell groups 70 are housed in the housing 5 and arranged along the first direction X. Each battery cell group 70 includes multiple battery cells 7 arranged along a second direction Y, which is perpendicular to the first direction X. The battery cell groups 70 are respectively supported and bonded to the inner surface of the housing 5 at both ends in the second direction Y. (Reference) Figure 4 A separator 8 is provided between two adjacent battery cell groups 70. On a plane perpendicular to the first direction X, the orthographic projection of the separator 8 overlaps at least partially with the orthographic projection of each battery cell 7 in the battery cell group 70. (Reference) Figure 5 At least one first surface 81 of the separator 8 includes a first region 811 and a second region 812 that are interconnected. The first region 811 is provided with adhesive 9, and the separator 8 is bonded to the battery cell pack 70 by adhesive 9.

[0052] The housing 5 can be a component for providing a receiving space 5c, which is used to house components such as the battery cell pack 70, wiring harness, circuit board, and heat exchange device located inside the battery device 2, so that the housing 5 can provide protection for the battery cell pack 70, wiring harness, circuit board, heat exchange device, and other components.

[0053] The battery cell assembly 70 can be an independent module formed by arranging multiple battery cells 7 along a first direction X. For example, the first direction X can be the thickness direction of the battery cells 7, so that the multiple battery cells 7 in the battery cell assembly 70 are stacked along their own thickness direction.

[0054] Battery cell 7 can be a rechargeable battery cell, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. Battery cell 7 can be a lithium-ion battery cell, sodium-ion battery cell, sodium-lithium-ion battery cell, lithium metal battery cell, sodium metal battery cell, lithium-sulfur battery cell, magnesium-ion battery cell, nickel-metal hydride battery cell, nickel-cadmium battery cell, lead-acid battery cell, etc.

[0055] At least two battery cell packs 70 are housed in the housing 5, which means that the number of battery cell packs 70 housed in the housing 5 of the battery device 2 is two, three or more, which is beneficial to increasing the capacity of the battery device 2.

[0056] The second direction Y and the first direction X are perpendicular to each other. At least two battery cell groups 70 are arranged along the first direction X, meaning that the arrangement direction of the battery cell group 70 is perpendicular to the arrangement direction of the battery cells 7 in the battery cell group 70. The battery cell group 70 is respectively abutted and bonded to the inner surface of the housing 5 at both ends in the second direction Y, meaning that the battery cell group 70 is respectively abutted to two walls of the housing 5 at both ends in the second direction Y, and these two walls are arranged relatively spaced along the second direction Y; and the battery cell group 70 is respectively bonded to the inner surface of these two walls at both ends in the second direction Y. By having the battery cell group 70 abutted and bonded to the inner surface of the housing 5 at both ends in the second direction Y, not only can the ends of the battery cell group 70 in the second direction Y be firmly connected to the walls of the housing 5, making it less likely for the battery cell group 70 to shift within the housing 5, but also the multiple battery cells 7 in the battery cell group 70 can be clamped together, suppressing the expansion of the battery cells 7 in their thickness direction.

[0057] The separator 8 can be a deformable separation structure that can buffer the force through partial deformation. The separator 8 is provided between two adjacent battery cell groups 70, which means that a separator 8 is sandwiched between any two adjacent battery cell groups 70 arranged along the first direction X, so that any two adjacent battery cell groups 70 can be separated by the separator 8.

[0058] For example, the partition 8 may be a partition structure capable of elastic deformation, made of an elastic material, capable of absorbing stress through elastic deformation. In another embodiment, the partition 8 may be a partition structure capable of plastic deformation, made of a plastically deformable material, capable of absorbing stress through plastic deformation.

[0059] In a plane perpendicular to the first direction X, the orthographic projection of the separator 8 overlaps at least partially with the orthographic projection of each battery cell 7 in the battery cell pack 70. This can mean that the separator 8 extends continuously and uninterruptedly along the second direction Y. For example, the separator 8 has a length equal to that of the battery cell pack 70 in the second direction Y.

[0060] By ensuring that at least a portion of the orthographic projection of the separator 8 onto a plane perpendicular to the first direction X overlaps with at least a portion of the orthographic projection of each battery cell 7 in the battery cell group 70 onto a plane perpendicular to the first direction X, the separator 8 can cover at least a portion of each battery cell 7 in the battery cell group 70. This makes the separator 8 an integral structure that can extend in the second direction Y to cover at least a portion of each battery cell 7 in the battery cell group 70. The separator 8 has a large area, and two adjacent battery cell groups 70 can be separated by setting a separator 8.

[0061] The separator 8 can directly cover the sidewalls of multiple battery cells 7 in the battery cell pack 70, which not only reduces the loss of scrap material during the cutting and forming process of the separator 8, but also enables the separator 8 to be formed through continuous forming process; it also enables the separator 8 to buffer the misalignment between multiple battery cells 7 in two adjacent battery cell packs 70, reducing rework caused by positioning deviation of battery cells 7.

[0062] The first surface 81 may be two surfaces of the separator 8 disposed opposite to each other in the first direction X. At least one first surface 81 of the separator 8 includes a first region 811 and a second region 812 that are connected to each other. This can mean that one first surface 81 of the separator 8 includes a first region 811 and a second region 812 that are connected to each other; or it can mean that both first surfaces 81 of the separator 8 include a first region 811 and a second region 812 that are connected to each other.

[0063] The first region 811 is provided with adhesive 9. This can mean that the first region 811 of the first surface 81 is directly bonded with adhesive 9, allowing the separator 8 to be bonded to the adjacent battery cell group 70 via adhesive 9. Alternatively, the first region 811 may have a protruding structure 82, on which double-sided adhesive is bonded. The protruding structure 82 is bonded to the adjacent battery cell group 70 via adhesive 9, thus allowing the separator 8 to be bonded to the adjacent battery cell group 70. Since the first region 811 is only a part of the first surface 81, and the second region 812 of the first surface 81 is another part connected to the first region 811, the first region 811 with adhesive 9 can only occupy a portion of the first surface 81, thus ensuring that a portion of the first surface 81 in the separator 8 is bonded and fixed to the battery cell group 70. In other words, the separator 8 affected by the compression deformation of multiple battery cells 7 in the battery cell pack 70 is only on the first region 811. The stress on the separator 8 in the first region 811 can be absorbed by the elastic deformation of the separator 8 in the second region 812 connected to it at the edge of the first region 811, and it is not easy to cause wrinkling deformation of the separator 8.

[0064] For example, adhesive 9 can be a double-sided adhesive or a two-component polyurethane structural adhesive.

[0065] By providing adhesive 9 in the first region 811, the separator 8 is bonded to the battery cell pack 70 through adhesive 9, which not only reduces the misalignment of the separator 8 relative to the battery cell pack 70, but also reduces the possibility of the separator 8 falling off during the transfer of the battery cell pack 70.

[0066] In the above structure, since at least one first surface 81 of the separator 8 includes a first region 811 provided with adhesive 9, the separator 8 can be bonded to the battery cell group 70 by the adhesive 9, thereby connecting to the battery cell group 70 and achieving fixation. Since the first surface 81 including the first region 811 also includes a second region 812 connecting the first region 811, the first region 811 provided with adhesive 9 can only occupy a part of the first surface 81, so that the separator 8 is bonded to the battery cell group 70 through a part of the first surface 81. This means that the deformation of the separator 8 caused by the compression of multiple battery cells 7 in the battery cell group 70 only occurs in the first region 811. The stress of these deformations can be absorbed by the elastic deformation of the separator 8 in the second region 812 connected to the edge of the first region 811, which is less likely to cause wrinkles in the separator 8. This allows the separator 8 to stably play a buffering and heat insulation role between two adjacent battery cell groups 70, which is beneficial to improving the reliability of the battery device 2.

[0067] In some embodiments, the area of ​​the first region 811 is set to E, and the area of ​​the first surface 81 is set to F, where 0.15 ≤ E / F ≤ 0.3.

[0068] By setting the area of ​​the first region 811 to E, the area of ​​the first surface 81 to F, and setting the ratio of the two to E / F≥0.15, the ratio of the area of ​​the first region 811 to the total area of ​​the first surface 81 is not too small. This ensures that the adhesive 9 provided on the separator 8 has a large area to provide sufficient adhesive force for the bonding between the separator 8 and the battery cell assembly 70, so that the separator 8 can be firmly connected to the battery cell assembly 70.

[0069] By setting the ratio of the area E of the first region 811 to the area F of the first surface 81 to E / F≤0.3, the ratio of the area of ​​the first region 811 to the total area of ​​the first surface 81 is not too large, which reduces the possibility of excessive deformation of the separator 8 caused by too many battery cells 7 corresponding to the first region 811. This allows these deformations to be absorbed by the elastic deformation of the separator 8 of the second region 812 at the edge of the first region 811, reducing the possibility of wrinkles in the separator 8.

[0070] In some embodiments, 0.2≤E / F≤0.3. For example, the ratio E / F of the area E of the first region 811 and the area F of the first surface 81 can be 0.2, 0.25 or 0.3. This not only enables the adhesive 9 to provide sufficient adhesive force for the connection between the separator 8 and the battery cell group 70, but also reduces the possibility of excessive deformation of the separator 8 caused by an excessive number of battery cells 7 in the first region 811, which is beneficial to reduce the possibility of wrinkles in the separator 8.

[0071] In some embodiments, reference Figure 6 The first region 811 protrudes along the first direction X to form a raised structure 82, and the adhesive 9 is disposed on the surface of the raised structure 82 facing the battery cell pack 70 in the first direction X.

[0072] The protruding structure 82 can be a structure formed by the outward protrusion of the first region 811 of the first surface 81. The adhesive 9 is disposed on the surface of the protruding structure 82 facing the battery cell group 70 in the first direction X. This means that the adhesive 9 is disposed on the surface of the protruding structure 82 facing the battery cell group 70 in the first direction X, so that the adhesive 9 can bond the battery cell group 70 to the protruding structure 82, thereby realizing the connection between the battery cell group 70 and the elastic heat insulation component.

[0073] Since the battery cell pack 70 is arranged along the first direction X, the protruding structure 82 protrudes outward from the first region 811 along the first direction X. This allows the protruding structure 82 on the first region 811 to provide a greater holding force against the battery cell pack 70 compared to the second region 812 when the separator 8 abuts against the battery cell pack 70. This is beneficial for increasing the pressure on the adhesive 9 and improving the firmness of the connection between the battery cell pack 70 and the elastic heat insulation member.

[0074] In some embodiments, one of the two first surfaces 81 is bonded to the battery cell assembly 70 by adhesive 9, and the other is abutted and bonded to the battery cell assembly 70.

[0075] In this embodiment, one of the two first surfaces 81 on both sides of the separator 8 in the first direction X is bonded to the battery cell group 70 disposed on the outer side of the first surface 81 by an adhesive 9 disposed thereon, while the other is directly bonded and abutted against the outer battery cell group 70. This ensures that only one of the two first surfaces 81 in the separator 8 is bonded to the battery cell group 70 by the adhesive 9, while the other is directly bonded and abutted against another battery cell group 70. This means that during the compression process of multiple battery cells 7 in the battery cell group 70, only one battery cell 7 in the battery cell group 70 on both sides of the separator 8 will exert force on the separator 8 through the adhesive 9, reducing the impact of the compression of the battery cells 70 on the separator 8 and further reducing wrinkles in the separator 8.

[0076] In some embodiments, at least a portion of the central axis of the separator 8 overlaps with the orthographic projection of the first region 811 on a plane perpendicular to the first direction X.

[0077] By overlapping at least a portion of the central axis of the separator 8 with the orthographic projection of the first region 811 onto a plane perpendicular to the first direction X, the first region 811 is located in the middle region of the separator 8, so that the adhesive 9 can more evenly support the separator 8 in fixing it, making the separator 8 less likely to fall off.

[0078] For example, the central axis of the separator 8 is arranged to overlap with the central axis of the first region 811, so that the first region 811 is located in the central region of the separator 8, which helps to improve the support force of the battery cell pack 70 on the separator 8 through the adhesive 9.

[0079] In some embodiments, the battery device 2 further includes a detector disposed in the separator 8.

[0080] The detector can be a device used to detect the pressure or temperature exerted on the separator 8 between two adjacent battery cell packs 70. By placing the detector in the separator 8, the detector can measure the pressure or temperature exerted on the separator 8 between two adjacent battery cell packs 70.

[0081] For example, the detector may include a pressure sensor. By placing the detector in the separator 8, the detector can monitor the pressure on the separator 8 between two adjacent battery cell groups 70. This allows the operator to be aware of the pressure on the separator 8 of the battery cell group 70 during the transfer into the housing 5 and in the housing 5, which helps to reduce the possibility of the battery cell 7 being damaged by pressure.

[0082] In some examples, the detector may include a temperature sensor, which, by being placed in the separator 8, enables the detector to monitor the temperature of the separator 8 between two adjacent battery cell groups 70, so that temperature changes between the two adjacent battery cell groups 70 can be promptly known to the operator.

[0083] In some embodiments, reference Figure 7 At least two first regions 811 are provided, and at least two first regions 811 are provided at intervals. Two adjacent first regions 811 are connected by a second region 812.

[0084] At least two first regions 811 are spaced apart, and two adjacent first regions 811 are connected by a second region 812. This means that at least two first regions 811 are distributed on the first surface 81, and the edge of any first region 811 is surrounded by the second region 812, so that the stress of deformation of the first region 811 can be absorbed by the elastic deformation of the separator 8 of the second region 812 connected to the periphery of the first region 811, and wrinkles of the separator 8 are not easily caused.

[0085] By setting at least two first regions 811 and spacing them apart, the first regions 811 are distributed on the first surface 81, which can provide support for the separator 8 more evenly, so that the separator 8 is more firmly fixed between two adjacent battery cell groups 70.

[0086] For example, the size of the second region 812 between two adjacent first regions 811 in the direction of the interval between the two first regions 811 is greater than the sum of the sizes of the two first regions 811 in the direction of the interval between the two first regions 811, so that the interval between the two adjacent first regions 811 is larger, and the separator 8 of the second region 812 can absorb the force of the first region 811 more fully through elastic deformation, and is less likely to cause wrinkles in the separator 8.

[0087] In some embodiments, at least two first regions 811 are spaced apart along the second direction Y.

[0088] By arranging at least two first regions 811 at intervals along the second direction Y, the arrangement of at least two first regions 811 can adapt to the extension of the separator 8 along the second direction Y, so that the supporting force of the battery cell pack 70 on the separator 8 through the adhesive 9 is evenly distributed in the second direction Y, making the separator 8 less likely to fall off.

[0089] In some embodiments, reference Figure 8 The separator 8 includes a main structure 83 and a covering film layer 84. The main structure 83 is a foamed structure, and the covering film layer 84 covers the outer surface of the main structure 83.

[0090] By setting the main structure 83 as a foamed structure, not only does the main structure 83 have good heat insulation effect, but the weight of the separator 8 is also reduced, which is beneficial to the weight reduction of the battery device 2. The coating layer 84 can be a film layer structure that covers the outer surface of the main structure 83, encapsulating the main structure 83. Since the main structure 83 is a foamed structure, by covering the outer surface of the main structure 83 with the coating layer 84, the dust that falls off the main structure 83 can be sealed by the coating layer 84 and is not easy to scatter outward.

[0091] For example, the main structure 83 may include ceramicized silicone foam, and the covering film 84 may be a polyethylene terephthalate film structure, so that the separator 8 has good insulation effect.

[0092] In some examples, the main structure 83 uses a low-density foaming process, which gives the separator 8 sufficient cushioning capacity under pressure.

[0093] In some embodiments, the surface of the separator 8 is cleaned to ensure strong adhesion between the adhesive 9 and the surface of the separator 8. The side of the battery cell assembly 70 in the first direction X is also cleaned to ensure strong adhesion between the adhesive 9 and the surface of the battery cell assembly 70.

[0094] Some embodiments of this application provide a battery device 2, which includes a housing 5, a separator 8, and at least two battery cell groups 70. The separator 8 includes two first surfaces 81 disposed opposite each other in a first direction X. The at least two battery cell groups 70 are housed in the housing 5 and arranged along the first direction X. Each battery cell group 70 includes a plurality of battery cells 7 arranged along a second direction Y, which is perpendicular to the first direction X. The two ends of each battery cell group 70 in the second direction Y respectively abut against and are bonded to the inner surface of the housing 5. A separator 8 is disposed between two adjacent battery cell groups 70. One of the two first surfaces 81 of the separator 8 is bonded to the battery cell group 70 by an adhesive 9, and the other abuts against and adheres to the battery cell group 70. The first surface 81 includes a first region 811 and a second region 812 that are connected to each other. The first region 811 is located in the middle of the first surface 81 and is provided with adhesive 9. The separator 8 is bonded to the battery cell group 70 by adhesive 9. The separator 8 extends along the second direction Y; on a plane perpendicular to the first direction X, the orthographic projection of the separator 8 overlaps with at least a portion of the orthographic projection of each battery cell 7 in the battery cell group 70.

[0095] In the above structure, since at least one first surface 81 of the separator 8 includes a first region 811 provided with adhesive 9, the separator 8 can be bonded to the battery cell group 70 through the adhesive 9, thereby connecting to the battery cell group 70 and achieving fixation. Since the first surface 81 including the first region 811 also includes a second region 812 connecting the first region 811, the first region 811 provided with adhesive 9 can only occupy a part of the first surface 81, so that the separator 8 is bonded to the battery cell group 70 through a part of the first surface 81. This means that the deformation of the separator 8 caused by the compression of multiple battery cells 7 in the battery cell group 70 only occurs in the first region 811. The stress of these deformations can be absorbed by the elastic deformation of the separator 8 in the second region 812 connected to the edge of the first region 811, which is less likely to cause wrinkles in the separator 8. This allows the separator 8 to stably play a buffering and heat insulation role between two adjacent battery cell groups 70, which is beneficial to improving the reliability of the battery device 2.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Box; The separator includes two first surfaces disposed opposite each other in a first direction; At least two battery cell groups are housed in the housing, and the at least two battery cell groups are arranged along the first direction. Each battery cell group includes a plurality of battery cells arranged along a second direction, which is perpendicular to the first direction. The battery cell groups abut against the inner surface of the housing at both ends in the second direction. The separator is provided between two adjacent battery cell groups, and on a plane perpendicular to the first direction, the orthographic projection of the separator overlaps with at least a portion of the orthographic projection of each battery cell in the battery cell group. At least one of the first surfaces of the separator includes a first region and a second region that are interconnected, the first region being provided with adhesive, and the separator being bonded to the battery cell assembly by the adhesive.

2. The battery device according to claim 1, characterized in that, The area of ​​the first region is set to E, and the area of ​​the first surface is set to F, where 0.15 ≤ E / F ≤ 0.

3.

3. The battery device according to claim 1, characterized in that, The first region protrudes along the first direction to form a raised structure, and the adhesive is disposed on the surface of the raised structure facing the battery cell assembly in the first direction.

4. The battery device according to claim 1, characterized in that, One of the two first surfaces is bonded to the battery cell assembly by the adhesive, and the other is abutted and bonded to the battery cell assembly.

5. The battery device according to claim 1, characterized in that, In a plane perpendicular to the first direction, at least a portion of the central axis of the separator overlaps with the orthographic projection of the first region.

6. The battery device according to claim 1, characterized in that, The battery device also includes a detector disposed in the separator.

7. The battery device according to claim 1, characterized in that, The first region is provided in at least two places, and the at least two first regions are set at intervals, with two adjacent first regions connected by the second region.

8. The battery device according to claim 7, characterized in that, At least two of the first regions are spaced apart along the second direction.

9. The battery device according to claim 1, characterized in that, The separator includes a main structure and a covering film layer. The main structure is a foamed structure, and the covering film layer covers the outer surface of the main structure.

10. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-9, the battery device being used to provide electrical energy.

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