Battery pack and electric device

Abstract

The application provides a battery pack and an electric device. The battery pack comprises a box body, a battery pack and at least one partition plate. The battery pack is arranged in a containing cavity and comprises a plurality of battery cells arranged in an array along a first direction and a second direction. The first direction and the second direction are perpendicular to each other and perpendicular to the height direction of the battery cell. The battery cells arranged along the first direction form a battery row. At least one side surface of the partition plate is fixedly connected to the side surface of the battery cell of the adjacent battery row. The battery cell comprises a shell and a cover plate which are fixedly connected to each other. The shell and the cover plate are fixedly connected by a connecting portion on the side surface of the battery cell. The top end of the partition plate is located below the connecting portion in the height direction of the battery cell. The battery pack can effectively reduce the leakage probability of the connecting portion on the side surface of the battery cell and effectively improve the working safety of the battery pack.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a battery pack and an electrical device. Background Technology

[0002] A battery cell typically consists of a housing and a cover. The housing primarily houses the electrolyte and the cell itself, and its design must balance high rigidity, lightweight, and corrosion resistance. The cover usually integrates key components such as terminals, explosion-proof valves, and electrolyte filling holes. The housing and cover are typically welded together, with the cover fixedly connected to the housing opening. Therefore, weld lines are often present at the connection between the battery housing and the cover.

[0003] To improve the overall structural strength of the battery pack, partition plates can be fixed to the sides of the rows of battery cells. However, under prolonged vibration, these partition plates can cause the battery cell casings to move, potentially leading to tearing of the welds between the cell covers and casings. This can result in dangerous situations such as electrolyte leakage. The leaked electrolyte can rapidly corrode surrounding metal, damage the insulation between battery cells, create conductive pathways within the pack, causing short circuits, and even trigger thermal runaway in adjacent cells. This can lead to battery pack fires or even explosions, significantly reducing the pack's operational safety. Utility Model Content

[0004] In view of this, the present application aims to provide a battery pack and electrical equipment to solve the technical problem that the weld between the cover plate and the shell of the battery cell in the existing battery pack is easily torn by the partition plate, which leads to dangerous situations such as leakage of battery cell and affects the working safety of the battery pack.

[0005] The first aspect of this application provides a battery pack, comprising: The box includes a base plate and a frame fixed to the outer periphery of the base plate, the base plate and the frame forming a receiving cavity; A battery pack, wherein the battery pack is disposed within the receiving cavity, and includes at least a plurality of battery cells arranged in an array along a first direction and a second direction, wherein the first direction and the second direction are perpendicular to each other and perpendicular to the height direction of the battery cells, and the battery cells arranged along the first direction form a battery row; At least one partition plate, at least one side of which is fixedly connected to the side of a battery cell in an adjacent row of batteries; The battery cell includes at least a housing and a cover plate that are fixedly connected to each other, and the housing and the cover plate are fixedly connected to each other via a connecting part on the side of the battery cell; in the height direction of the battery cell, the top of the partition plate is configured to be located below the connecting part.

[0006] Another aspect of this application provides an electrical device including the aforementioned battery pack.

[0007] In the battery pack of this application embodiment, even if a battery cell pulls the casing of a neighboring battery cell through the partition plate, since the top of the partition plate is located below the connection part in the height direction of the battery cell, it is relatively difficult for the partition plate to pull the neighboring part of the connection part on the side of the battery cell when it vibrates up and down. This can effectively reduce the probability of leakage at the connection part on the side of the battery cell, thereby effectively reducing the probability of dangerous situations such as leakage of battery cells and effectively improving the working safety of the battery pack of this application embodiment. Attached Figure Description

[0008] It should be understood that the following figures only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0009] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0010] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0011] Figure 1 This is a perspective view of the battery pack according to an embodiment of this application.

[0012] Figure 2 This is a front view of the battery pack according to an embodiment of this application.

[0013] Figure 3 This is a partial cross-sectional schematic diagram of the battery pack according to an embodiment of this application.

[0014] Figure 4 This is another cross-sectional schematic diagram of the battery pack according to an embodiment of this application.

[0015] Figure 5 This is a partial perspective view of the partition plate and adhesive layer in an embodiment of this application.

[0016] Attached image labels: 10. Enclosure; 11. Base plate; 12. Frame; 13. Reinforcing beam; 14. Battery compartment; 15. Electrical compartment; 20. Battery pack; 21. Battery cell; 211. Housing; 212. Cover plate; 213. Connecting part; 22. Battery row; 30. Partition plate; 40. Adhesive layer.

[0017] X - First direction; Y - Second direction; Z - Height direction; Detailed Implementation Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] like Figures 1 to 5 As shown, this application provides a battery pack, which includes at least a housing 10 and a battery pack 20 disposed within the housing 10. The housing 10 includes a base plate 11 and a frame 12 fixed to the outer periphery of the base plate 11, and the base plate 11 and the frame 12 form a receiving cavity. The receiving cavity is used to accommodate various structures required for the battery pack.

[0020] Specifically, the battery pack can be a battery group composed of multiple battery cells connected in series and / or parallel, a battery management system (BMS), a thermal management system, an electrical connection system (which may include high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (shell, brackets, etc.), and protective components. These components are placed inside a housing and sealed with a cover, forming a complete functional unit capable of directly outputting electrical energy. As a rechargeable battery, the battery pack can serve as a power source for electrical equipment such as new energy vehicles. Specifically, the aforementioned housing 10 can be a closed or semi-closed structure made of materials such as metal or plastic, serving as the physical carrier of the battery pack 20. Its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The housing 10 provides installation space for the battery pack 20, BMS, cooling system, electrical connections 213, etc., and through a reasonable structural design, fixes these components inside the housing 10, ensuring they maintain a relatively stable position during battery pack operation and preventing damage or loosening of connections due to vibration, impact, or other factors.

[0021] The housing 10 may include a lower housing and an upper housing. The lower housing includes a base plate 11 and a frame 12 connected to and surrounding the base plate 11. The upper housing is connected to the frame 12 and has a top plate opposite to the base plate 11. The upper and lower housings together form a receiving cavity. The frame 12 and the base plate 11 can be integrally formed or processed separately and then fixedly connected. Specifically, the frame 12 and the base plate 11 are fixedly connected by welding, riveting, screwing, etc. When the housing 10 is a cube, the frame 12 of the lower housing generally has four side plates surrounding the periphery of the base plate 11. In other embodiments, the shape of the housing 10 may also be a cylinder or other shapes. The frame 12 mainly serves as support, protection, and connection. The frame 12 may be formed by splicing multiple beams together. The frame 12 may be rectangular, circular, polygonal, etc., without limitation. The frame 12 may be made of various materials, such as aluminum alloy, copper alloy, steel, plastic, etc. The beam of frame 12 can be a solid structure or contain cavities. The base plate 11 is the main load-bearing component of the battery pack, used to support and fix the battery pack 20, battery management system, cooling system, and other components inside the battery pack. The base plate 11 is located at the bottom of the frame 12 and can be fixed to the bottom of the frame by welding, riveting, screwing, or other methods. The base plate 11 can be rectangular, circular, polygonal, or a plate-like structure; its shape is not limited, and its size is determined by the number and size of the battery cells housed in the battery pack. The housing 10 can be cast from materials such as steel or aluminum alloy, or made from lightweight materials such as glass fiber reinforced composite materials or carbon fiber reinforced composite materials.

[0022] Specifically, such as Figure 1 and Figure 2 As shown, the battery pack 20 is disposed within a receiving cavity and includes at least a plurality of battery cells 21 arranged in an array along a first direction and a second direction. The first direction and the second direction are perpendicular to each other and perpendicular to the height direction of the battery cells 21. The battery cells 21 arranged along the first direction form a battery row 22. Specifically, the plurality of battery cells 21 with similar capacity and internal resistance can be connected in series or in parallel to form the battery pack 20.

[0023] The battery cell 21 includes at least a housing 211 and a cover plate 212 fixedly connected to each other, and the housing 211 and the cover plate 212 are fixedly connected on the side of the battery cell 21 by a connecting part 213. It is understood that the battery cell 21 in this embodiment may also include a battery cell and an electrolyte. The housing 211 and the cover plate 212 are used together to contain the battery cell and the electrolyte. The cover plate 212 may be provided with at least one positive terminal and at least one negative terminal for electrical connection to the outside.

[0024] In one embodiment of this application, the housing 211 and the cover plate 212 are welded together, and the connecting part 213 is the weld formed by welding the housing 211 and the cover plate 212.

[0025] When the housing 211 and the cover plate 212 are fixedly connected to each other by bonding, riveting, or other fixing methods, the connecting part 213 has a different structure. It is understood that compared to other locations on the side of the battery cell 21, the connecting part 213 is generally more fragile and has lower structural strength. The battery cell includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and a separator. The separator is located between adjacent positive and negative electrode plates to insulate them. At least one end of the electrode assembly has a tab, and one end of an adapter plate is electrically connected to the tab, while the other end is electrically connected to the terminal post. It is understood that the battery cell 21 in this embodiment can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and is not limited thereto. The battery cell 21 can store chemical energy and controllably convert it into electrical energy. For recyclable battery cells 21, the active materials can be reactivated by charging after discharge for continued use. To improve the structural strength of the battery pack in the second direction according to this application embodiment, such as... Figures 3 to 5 As shown, the battery pack of this embodiment is further provided with at least one partition plate 30, and at least one side of the partition plate 30 is fixedly connected to the side of the battery cell 21 of the adjacent battery row 22.

[0026] Since the separator 30 is located adjacent to the battery row 22, at least one side of the separator 30 is fixedly connected to the side of the battery cell 21 of the adjacent battery row 22. That is, the separator 30 extends along the first direction as a whole and is fixedly connected to the side of each battery cell 21 of at least one battery row 22. This can effectively improve the structural strength of the battery pack in the second direction of the present application embodiment. When the battery pack is subjected to pressure in the second direction, the separator 30 can effectively provide support strength to reduce the deformation of the battery pack in the second direction of the present application embodiment.

[0027] like Figure 2 As shown, in one embodiment of this application, at least one partition plate 30 is located between adjacent battery rows 22, and the two sides of the partition plate 30 are fixedly connected to the sides of the battery cells 21 of the adjacent battery rows 22. That is, partition plates 30 can be provided between adjacent battery rows 22. For partition plates 30 located between adjacent battery rows 22, the two sides of the partition plate 30 are fixedly connected to the sides of the battery cells 21 of the adjacent battery rows 22, so as to fill the gap between adjacent battery rows 22, improve the structural strength of the battery pack in the second direction, and reduce the deformation of the battery pack in the second direction.

[0028] It is understood that during the operation of the battery pack in this application embodiment, the battery cells 21 of the battery pack may vibrate up and down along the height direction of the battery cells 21 under the action of external force, and the movement amplitude of adjacent battery cells 21 in the same battery row 22 cannot be kept completely consistent; and for the partition plate 30 located between adjacent battery rows 22, the movement amplitude of the battery cells 21 on both sides of the partition plate 30 cannot be kept completely consistent.

[0029] Therefore, during the up-and-down vibration of the battery cell 21, the battery cell 21 will pull on the casing 211 of the adjacent battery cell 21 through the separator 30. As mentioned above, compared with other parts of the side of the battery cell 21, the connection 213 between the casing 211 and the cover plate 212 is usually more fragile and has lower structural strength. Therefore, under long-term vibration conditions, the separator 30 can easily drive the casing 211 of the battery cell 21 to move, which can easily cause the connection 213 to be torn by the separator 30, resulting in dangerous situations such as leakage of the battery cell 21, which greatly reduces the working safety of the battery pack.

[0030] Therefore, as Figure 3 As shown, in one embodiment of this application, the top of the separator 30 is configured to be located below the connection portion 213 in the height direction of the battery cell 21.

[0031] In the battery pack of this application embodiment, even if the battery cell 21 pulls on the casing 211 of the adjacent battery cell 21 through the partition plate 30, since the top of the partition plate 30 is located below the connecting portion 213 in the height direction of the battery cell 21, it is relatively difficult for the partition plate 30 to pull on the adjacent position of the connecting portion 213 on the side of the battery cell 21 when it vibrates up and down. This can effectively reduce the probability of leakage at the connecting portion 213 on the side of the battery cell 21, thereby effectively reducing the probability of dangerous situations such as leakage of the battery cell 21, and effectively improving the working safety of the battery pack of this application embodiment.

[0032] Specifically, such as Figure 3As shown, in one embodiment of this application, the distance between the top of the separator 30 and the connecting portion 213 in the height direction of the battery cell 21 is h, in mm, where h satisfies 10mm ≤ h ≤ 30mm. When the distance h between the top of the separator 30 and the connecting portion 213 is less than 10mm, the spacing between them is relatively close, and the vibration of the separator 30 up and down has a relatively large impact on the connecting portion 213 on the side of the battery cell 21. When the distance h between the top of the separator 30 and the connecting portion 213 is greater than 30mm, the overall height of the separator 30 is limited, and the portion of the battery cell 21 without the separator 30 is prone to deformation when subjected to impact force along the second direction. Therefore, when the distance h between the top of the separator 30 and the connecting part 213 in the height direction of the battery cell 21 satisfies 10mm≤h≤30mm, it can effectively reduce the force exerted by the top of the separator 30 on the connecting part 213 on the side of the battery cell 21, and effectively ensure the coverage of the separator 30 on the side of the battery cell 21, thereby effectively reducing the deformation of the battery cell 21 when subjected to an impact force along the second direction.

[0033] Furthermore, in one embodiment of this application, the distance h between the top end of the separator 30 and the connecting portion 213 satisfies 15mm ≤ h ≤ 20mm. When the distance h between the top end of the separator 30 and the connecting portion 213 satisfies 15mm ≤ h ≤ 20mm, the force exerted by the top end of the separator 30 on the connecting portion 213 on the side of the battery cell 21 can be better reduced, and the coverage area of ​​the separator 30 on the side of the battery cell 21 can be better guaranteed, thereby further reducing the deformation of the battery cell 21 when subjected to an impact force along the second direction. In specific embodiments, the distance h between the top end of the separator 30 and the connecting portion 213 can be selected from specific values ​​such as 15mm, 16mm, 17mm, 18mm, 19mm, and 20mm, and is not limited here.

[0034] like Figure 5 As shown, in one embodiment of this application, the top of the separator 30 has the same height at all points. Because the top of the separator 30 has the same height at all points, the distance between the top of the separator 30 and the connecting portion 213 is equal in the height direction of the battery cell 21. This ensures that the force exerted by the separator 30 on the connecting portions 213 on the sides of each battery cell 21 is relatively small, thereby effectively reducing the probability of leakage at the connecting portions 213 on the sides of each battery cell 21. This further reduces the probability of dangerous situations such as leakage from all battery cells 21, thus comprehensively improving the operational safety of the battery pack in this embodiment.

[0035] like Figure 4As shown, in one embodiment of this application, the thickness of the separator 30 is d, in mm, where d satisfies 1mm ≤ h ≤ 3mm. When the thickness d of the separator 30 is less than 1mm, the overall structural strength of the separator 30 is low, resulting in a weak reinforcement effect on the battery pack in the second direction. When the thickness d of the separator 30 is greater than 3mm, the space occupied by the separator 30 is large, affecting the energy density of the battery pack in this embodiment. Therefore, when the thickness d of the separator 30 satisfies 1mm ≤ h ≤ 3mm, it not only effectively ensures the overall structural strength of the separator 30, thereby effectively improving the overall strength of the battery pack in the second direction, but also saves the space occupied by the separator 30, effectively ensuring the energy density of the battery pack in this embodiment. In specific embodiments, the thickness d of the separator 30 can be selected from specific values ​​such as 1mm, 1.5mm, 2mm, 2.5mm, and 3mm, and is not limited here.

[0036] In one embodiment of this application, the separator 30 is constructed to be made of at least one of an epoxy resin plate, a polypropylene plastic plate, and a composite plastic plate. When the separator 30 is made of at least one of an epoxy resin plate, a polypropylene plastic plate, and a composite plastic plate, the overall structural strength of the separator 30 can be effectively guaranteed, thereby effectively improving the overall strength of the battery pack in the second direction.

[0037] Specifically, such as Figure 4 As shown, in one embodiment of this application, the separator 30 is bonded and fixed to the side of the battery cell 21 by an adhesive layer 40. Since the separator 30 is bonded and fixed to the side of the battery cell 21 by the adhesive layer 40, the fixed connection between the separator 30 and the side of each battery cell 21 can be easily and conveniently achieved, thereby improving the assembly efficiency of the battery pack in this embodiment of the application.

[0038] Furthermore, in one embodiment of this application, the thickness of the adhesive layer 40 is j, where j satisfies 0.3mm ≤ j ≤ 2mm. When the thickness j of the adhesive layer 404 is less than 0.3mm, it is difficult to ensure a tight bond between the separator 30 and the battery cell 21 through the adhesive layer 40; when the thickness j of the adhesive layer 404 is greater than 2mm, the thickness occupied by the adhesive layer 40 is too large, affecting the energy density of the battery pack in this embodiment. Therefore, when the thickness j of the adhesive layer 40 satisfies 0.3mm ≤ j ≤ 2mm, it is possible to effectively save the space occupied by the adhesive layer 40 while ensuring a tight bond between the separator 30 and the battery cell 21 through the adhesive layer 40, thereby further improving the energy density of the battery pack in this embodiment.

[0039] Furthermore, in one embodiment of this application, 0.5mm ≤ j ≤ 1mm. When 0.5mm ≤ j ≤ 1mm, the bonding between the separator 30 and the battery cell 21 via the adhesive layer 40 is effectively improved, while the space occupied by the adhesive layer 40 is effectively saved, thereby further improving the energy density of the battery pack in this embodiment of the application.

[0040] In a specific embodiment, the thickness j of the adhesive layer 40 can be selected from specific values ​​such as 0.3mm, 0.5mm, 0.8mm, 1mm, 2mm, etc., and is not limited here.

[0041] In one embodiment of this application, the adhesive strength of the adhesive layer 40 is t, in MPa, where t satisfies 2 MPa ≤ t ≤ 10 MPa. When the adhesive strength t of the adhesive layer 40 is less than 2 MPa, it is difficult to ensure that the separator 30 and the battery cell 21 are tightly bonded through the adhesive layer 40. Under long-term vibration conditions, some areas of the separator 30 may detach from the battery cell 21, thereby affecting the overall structural stability of the battery pack in this embodiment. When the adhesive strength t of the adhesive layer 404 is greater than 10 MPa, the adhesive force between the separator 30 and the battery cell 21 is too large, and the force exerted on the side of the battery cell 21 when the separator 30 vibrates up and down is also relatively large, which can easily affect the strength of the side connection portion 213 of the battery cell 21. Therefore, when the adhesive strength t of the adhesive layer 40 satisfies 2 MPa ≤ t ≤ 10 MPa, the force exerted by the top of the separator 30 on the connection portion 213 on the side of the battery cell 21 can be appropriately reduced while ensuring a tight bond between the separator 30 and the battery cell 21 through the adhesive layer 40. This reduces the probability of leakage at the connection portion 213 on the side of the battery cell 21 and improves the operational safety of the battery pack in this embodiment. In specific embodiments, the adhesive strength t of the adhesive layer 40 can be selected from specific values ​​such as 2 MPa, 5 MPa, and 10 MPa, and is not limited here.

[0042] In one embodiment of this application, the adhesive layer 40 is configured to be made of at least one of structural adhesive or thermally conductive adhesive. When the adhesive layer 40 is made of at least one of structural adhesive or thermally conductive adhesive, it can effectively ensure that the separator 30 and the battery cell 21 are tightly bonded through the adhesive layer 40.

[0043] like Figure 3 and Figure 4As shown, in one embodiment of this application, the bottom end of the partition plate 30 is attached to the bottom plate 11 of the housing 10. When the bottom end of the partition plate 30 is attached to the bottom plate 11 of the housing 10, under vibration conditions, the partition plate 30, the battery cell 21, and the bottom plate 11 of the housing 10 can vibrate up and down as synchronously as possible, thereby reducing the interaction force between the partition plate 30 and the battery cell 21, thus reducing the probability of leakage at the connection portion 213 on the side of the battery cell 21, and improving the operational safety of the battery pack in this embodiment of the application.

[0044] Furthermore, in one embodiment of this application, the bottom end of the partition plate 30 is fixedly connected to the bottom plate 11 of the housing 10. When the bottom end of the partition plate 30 is fixedly connected to the bottom plate 11 of the housing 10, it can be further ensured that under vibration conditions, the partition plate 30, the battery cell 21 and the bottom plate 11 of the housing 10 can vibrate up and down synchronously, thereby minimizing the interaction force between the partition plate 30 and the battery cell 21, thereby further reducing the probability of leakage at the connection portion 213 on the side of the battery cell 21, and effectively improving the working safety of the battery pack in this embodiment of the application.

[0045] In one embodiment of this application, a heat insulation pad is provided between adjacent battery cells 21 in the battery row 22. The heat insulation pad can prevent the spread of thermal runaway, block heat transfer, delay the spread of thermal runaway, protect the overall safety of the battery pack, reduce mutual compression and collision between battery cells 21, absorb vibration and shock, and extend battery life; maintain the internal temperature of the battery pack, reduce heat loss or the influence of external high temperature, ensure battery performance, and also be flame-retardant and fireproof.

[0046] like Figure 1 and Figure 2 As shown, in one embodiment of this application, the housing 10 further includes a reinforcing beam 13, which is configured to extend along a first direction of the battery pack and is fixedly connected to the frame 12 and / or the base plate 11. By providing a reinforcing beam 13 extending along the first direction of the battery pack within the housing 10 of this application embodiment, and by fixing the reinforcing beam 13 to the frame 12 and / or the base plate 11, the structural strength of the battery pack in the first direction of this application embodiment can be effectively improved by the reinforcing beam 13. When the battery pack is subjected to pressure in the first direction, the reinforcing beam 13 can effectively provide support strength to reduce the deformation of the battery pack in the first direction of this application embodiment.

[0047] Understandably, the reinforcing beam 13 can be a strip structure, with both ends connected to the two sides of the frame 12 of the box 10, respectively, to divide the interior of the box 10 into two sub-spaces located on either side of the reinforcing beam 13. The reinforcing beam 13 can be made of metal, or it can be integrally molded by rubber injection molding, plastic injection molding, or molding injection molding. The plastic used for plastic injection molding can be polyethylene, polypropylene, ABS, PA, polystyrene, etc. The reinforcing beam 13 can be manufactured by die casting or by other methods such as extrusion molding, and then connected to the box 10 by welding.

[0048] Furthermore, such as Figure 2 As shown, in one embodiment of this application, a reinforcing beam 13 is configured within the receiving cavity to divide the battery compartment 14 and the electrical compartment 15; the battery pack 20 is disposed within the battery compartment 14, and the electrical compartment 15 is separated from the battery compartment 14 by the reinforcing beam 13.

[0049] It is understood that the battery pack in this embodiment of the application is separated into an electrical compartment 15 by a reinforcing beam 13. The electrical compartment 15 can be used to arrange various electrical components required by the battery pack, such as circuit breaker units, battery management systems (BMS), and input / output interfaces. Since the battery pack 20 is located inside the battery compartment 14, and the electrical compartment 15 is separated from the battery compartment 14 by the reinforcing beam 13, when the battery cell 21 in the battery compartment 14 experiences thermal runaway and ejects a large amount of high-temperature and high-pressure gas, the high-temperature and high-pressure gas can be prevented from flowing into the electrical compartment 15. This prevents the high-temperature and high-pressure gas generated by the battery thermal runaway from affecting the normal operation of the electrical components in the electrical compartment 15, thereby ensuring that the battery pack of this embodiment of the application can continue to supply power normally for a period of time, thereby improving the safety of the battery pack of this embodiment of the application when it is used in electric vehicles and other equipment.

[0050] Furthermore, such as Figure 2 As shown, in one embodiment of this application, the battery cell 21 has a first side parallel to a first direction and a second side parallel to a second direction. At least one side of the separator 30 is fixedly connected to the first side of the battery cell 21 in the adjacent battery row 22. The width of the first side is smaller than the width of the second side. That is, the first side is the smaller side of the battery cell 21 in this embodiment of the application. The separator 30 is fixedly connected to the smaller side of the battery cell 21, which can further reduce the probability of the connection 213 being torn by the separator 30, thereby reducing the probability of dangerous situations such as leakage of the battery cell 21, and effectively improving the working safety of the battery pack in this embodiment of the application.

[0051] This application also provides an electrical device that includes at least one of the aforementioned battery packs. It is understood that this electrical device can be any type of electrical device, such as an electric vehicle, an appliance with a battery pack, or an energy storage device, and is not limited thereto.

[0052] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not describe the various possible combinations separately.

[0053] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0054] It should be understood that while terms such as "first" or "second" may be used in this application to describe various elements, these elements are not limited by these terms; these terms are merely used to distinguish one element from another. The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms "a," "the," and "the" as used in one or more embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0055] In this document, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, and not to define the absolute position of these related parts. Terms such as "equal" and "same" are not strict mathematical and / or geometric limitations, and also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several subranges contained therein.

[0056] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0057] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, include: The box (10) includes a base plate (11) and a frame (12) fixed to the outer periphery of the base plate (11), wherein the base plate (11) and the frame (12) form a receiving cavity; A battery pack (20) is disposed in the cavity and includes at least a plurality of battery cells (21) arranged in an array along a first direction and a second direction. The first direction and the second direction are perpendicular to each other and perpendicular to the height direction of the battery cells (21). The battery cells (21) arranged along the first direction form a battery row (22). At least one partition plate (30) is fixedly connected to the side of a battery cell (21) of an adjacent battery row (22); The battery cell (21) includes at least a housing (211) and a cover plate (212) that are fixedly connected to each other, and the housing (211) and the cover plate (212) are fixedly connected to each other by a connecting part (213) on the side of the battery cell (21); the top of the partition plate (30) is configured to be located below the connecting part (213) in the height direction of the battery cell (21).

2. The battery pack according to claim 1, characterized in that, In the height direction of the battery cell (21), the distance between the top of the separator (30) and the connecting part (213) is h, in mm, and h satisfies 10mm≤h≤30mm.

3. The battery pack according to claim 2, characterized in that, The distance h between the top of the partition plate (30) and the connecting part (213) satisfies 15mm≤h≤20mm.

4. The battery pack according to claim 1, characterized in that, The housing (211) and the cover plate (212) are welded together, and the connecting part (213) is the weld formed by welding the housing (211) and the cover plate (212).

5. The battery pack according to claim 1, characterized in that, The top of the partition plate (30) is at the same height at all points.

6. The battery pack according to claim 1, characterized in that, The thickness of the partition plate (30) is d, in mm, and d satisfies 1mm≤d≤3mm.

7. The battery pack according to claim 1, characterized in that, The partition plate (30) is constructed to be made of at least one of epoxy resin plate, polypropylene plastic plate, and composite plastic plate.

8. The battery pack according to claim 1, characterized in that, At least one of the partition plates (30) is located between adjacent battery rows (22), and the two sides of the partition plate (30) are fixedly connected to the sides of the battery cells (21) of the adjacent battery rows (22).

9. The battery pack according to claim 1, characterized in that, The separator (30) is bonded and fixed to the side of the battery cell (21) by an adhesive layer (40).

10. The battery pack according to claim 9, characterized in that, The thickness of the adhesive layer (40) is j, in mm, and j satisfies 0.3mm≤j≤2mm.

11. The battery pack according to claim 10, characterized in that, 0.5mm≤j≤1mm.

12. The battery pack according to claim 9, characterized in that, The bonding strength of the adhesive layer (40) is t, in MPa, and t satisfies 2 MPa≤t≤10 MPa.

13. The battery pack according to claim 9, characterized in that, The adhesive layer (40) is configured to be made of at least one of structural adhesive or thermally conductive adhesive.

14. The battery pack according to claim 1, characterized in that, The bottom end of the partition plate (30) is attached to the bottom plate (11) of the box body (10).

15. The battery pack according to claim 14, characterized in that, The bottom end of the partition plate (30) is fixedly connected to the bottom plate (11) of the box body (10).

16. The battery pack according to any one of claims 1 to 15, characterized in that, In the battery row (22), a heat insulation pad is provided between adjacent battery cells (21).

17. The battery pack according to any one of claims 1 to 15, characterized in that, The housing (10) also includes a reinforcing beam (13) configured to extend along a first direction of the battery pack and be fixedly connected to the frame (12) and / or the base plate (11).

18. The battery pack according to claim 17, characterized in that, The reinforcing beam (13) is configured within the accommodating cavity to divide the battery compartment (14) and the electrical compartment (15); the battery pack (20) is disposed within the battery compartment (14), and the electrical compartment (15) is separated from the battery compartment (14) by the reinforcing beam (13).

19. The battery pack according to claim 18, characterized in that, The battery cell (21) has a first side parallel to a first direction and a second side parallel to a second direction. At least one side of the separator (30) is fixedly connected to the first side of the battery cell (21) of the adjacent battery row (22). The width of the first side is smaller than the width of the second side.

20. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 19.

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