Battery pack and electric device

Abstract

The application provides a battery pack and an electric device. The battery pack comprises a pack body, a battery array and at least one reinforcing plate. The pack body comprises a bottom panel and an outer frame body. The outer frame body is fixed to the outer periphery of the bottom panel. The bottom panel and the outer frame body jointly form a receiving cavity. The battery array is arranged in the receiving cavity and comprises a plurality of battery bodies. The plurality of battery bodies are arranged in an array along a first direction and a second direction. The battery bodies arranged along the first direction form a battery row. At least one side surface of the reinforcing plate is fixedly connected to the side surface of the battery bodies of the adjacent battery row. The battery body comprises an outer shell and a cover plate member fixedly connected to each other. A connecting portion is arranged between the outer shell and the cover plate member on the side surface of the battery body. Along the first direction, the reinforcing plate is divided into a middle section and edge sections located on both sides of the middle section. In the height direction of the battery body, the top end height of the middle section is lower than the top end height of the edge sections. The top end of the middle section is configured to be located below the connecting portion.

Description

Technical Field

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

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

[0003] To enhance the overall structural strength of the battery pack, reinforcing plates can be fixed to the sides of the entire battery array. However, under prolonged vibration, these reinforcing plates can cause the battery casing to move, potentially leading to tearing of the weld between the battery cover and the casing. 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 outer shell of the battery body in the existing battery pack is easily torn by the reinforcing plate, which leads to dangerous situations such as battery leakage and affects the working safety of the battery pack.

[0005] The first aspect of this application provides a battery pack, comprising: The package includes a bottom panel and an outer frame, the outer frame being fixed to the outer periphery of the bottom panel, and the bottom panel and the outer frame together forming an accommodating cavity; A battery array is disposed within the accommodating cavity and includes multiple battery bodies arranged in an array along a first direction and a second direction. The first direction, the second direction, and the height direction of the battery bodies are perpendicular to each other. The battery bodies arranged along the first direction form a battery row. At least one reinforcing plate, at least one side of which is fixedly connected to the side of the battery body of the adjacent battery row; The battery body includes at least a shell and a cover plate that are fixedly connected to each other, and a connecting portion is provided between the shell and the cover plate on the side of the battery body; along the first direction, the reinforcing plate is divided into a middle section and edge sections located on both sides of the middle section; in the height direction of the battery body, the top height of the middle section is lower than the top height of the edge sections, and the top of the middle section is configured to be located below the connecting portion.

[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 the battery body pulls on the outer shell of the adjacent battery body through the reinforcing plate, since the top height of the middle section is lower than the top height of the edge section in the height direction of the battery body, and the top of the middle section of the reinforcing plate is located below the connecting part, it is relatively difficult for the middle section of the reinforcing plate to pull on the adjacent position of the connecting part on the side of the battery body in the middle area of ​​the battery row when it vibrates up and down. This can effectively reduce the probability of leakage at the connecting part on the side of the battery body in the middle area of ​​the battery row, thereby effectively reducing the probability of dangerous situations such as battery leakage and effectively improving the working safety of the battery pack of this application embodiment. Furthermore, since the top height of the middle section is lower than the top height of the edge section, the edge section of the reinforcing plate can extend upward a longer distance, thereby increasing the coverage area of ​​the reinforcing plate on the side of the battery body, effectively reducing the deformation of the battery body when subjected to impact force in the second direction. 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 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 5This is a three-dimensional schematic diagram of the reinforcing plate and adhesive layer according to an embodiment of this application.

[0016] Figure 6 This is a three-dimensional schematic diagram of the battery body according to an embodiment of this application.

[0017] Attached image labels: 10. Package body; 11. Bottom panel; 12. Outer frame; 13. Reinforcing beam; 14. Battery compartment; 15. Electrical compartment; 20. Battery array; 21. Battery body; 211. Outer shell; 2111. First side; 2112. Second side; 212. Cover plate; 213. Connecting part; 214. Insulating part; 215. Window area; 22. Battery row; 30. Reinforcing plate; 31. Middle section; 32. Edge section; 40. Adhesive layer.

[0018] 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.

[0019] 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.

[0020] like Figures 1 to 6 As shown, this application provides a battery pack, which includes at least a pack body 10 and a battery array 20 disposed within the pack body 10. The pack body 10 includes a bottom panel 11 and an outer frame 12, the outer frame 12 being fixed to the outer periphery of the bottom panel 11. The bottom panel 11 and the outer frame 12 together form a receiving cavity. The receiving cavity is used to accommodate various structures required for the battery pack.

[0021] Specifically, a battery pack can be a battery array composed of multiple battery cells connected in series and / or parallel, a battery management system (BMS), a thermal management system, an electrical connection system including high-voltage / low-voltage connectors, wiring harnesses, structural components such as housings and brackets, and protective components. These components are housed within the pack and sealed with a cover plate, 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.

[0022] Specifically, the aforementioned housing 10 can be a closed or semi-closed structure made of materials such as metal or plastic. It serves as the physical carrier of the battery array 20, and 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 array 20, BMS, cooling system, electrical connection parts 213, etc., and fixes these components inside the housing 10 through reasonable structural design, ensuring that they maintain a relatively stable position during battery pack operation and avoiding damage to components or loosening of connections due to vibration, impact, or other factors.

[0023] The package 10 may include a lower package and an upper package. The lower package includes a bottom panel 11 and an outer frame 12 connected to and surrounding the bottom panel 11. The upper package is connected to the outer frame 12 and has a cover plate 212 opposite to the bottom panel 11. The upper and lower packages together form an accommodating cavity. The outer frame 12 and the bottom panel 11 can be integrally formed or formed by separate processing and then fixed connection. Specifically, the outer frame 12 and the bottom panel 11 are fixedly connected by welding, riveting, screwing, etc. When the package 10 is a cube, the outer frame 12 of the lower package generally has four side plates, which surround the periphery of the bottom panel 11. In other embodiments, the shape of the package 10 may also be a cylinder or other shapes. The outer frame 12 mainly serves to support, protect, and connect. The outer frame 12 may be formed by splicing multiple beams together. The outer frame 12 may be rectangular, circular, polygonal, etc., and is not limited here. The outer frame 12 can be made of various materials, such as aluminum alloy, copper alloy, steel, and plastic. The interior of the beams of the outer frame 12 can be a solid structure or contain cavities. The bottom panel 11 is the main load-bearing component of the battery pack, used to support and fix the battery array 20, battery management system, cooling system, and other components inside the battery pack. The bottom panel 11 is located at the bottom of the outer frame 12 and can be fixed to the bottom of the outer frame by welding, riveting, screwing, or other methods. The bottom panel 11 can be rectangular, circular, polygonal, or plate-like; its shape is not limited, and its size is determined by the number and size of the battery cells contained in the battery pack. The pack body 10 can be cast from materials such as steel and aluminum alloy, or lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials.

[0024] Specifically, such as Figure 1 and Figure 2 As shown, the battery array 20 is disposed within the accommodating cavity and includes multiple battery cells 21. The multiple battery cells 21 are arranged in an array along a first direction and a second direction. The first direction, the second direction, and the height direction of the battery cells 21 are perpendicular to each other. The battery cells 21 arranged along the first direction form a battery row 22. Specifically, multiple battery cells 21 with similar capacity and internal resistance can be connected in series or in parallel to form the battery array 20.

[0025] Among them, such as Figure 6 As shown, the battery body 21 includes at least a housing 211 and a cover plate 212 fixedly connected to each other, and a connecting portion 213 is provided between the housing 211 and the cover plate 212 on the side of the battery body 21. It is understood that the battery body 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.

[0026] In one embodiment of this application, the outer shell 211 and the cover plate 212 are welded together, and the connecting part 213 is the weld formed by welding the outer shell 211 and the cover plate 212.

[0027] When the outer casing 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 body 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 body 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 body 21 can store chemical energy and controllably convert chemical energy into electrical energy. For the recyclable battery body 21, the active materials can be activated by charging after discharge and continue to be used.

[0028] To improve the structural strength of the battery pack in the second direction according to the embodiments of this application, such as Figures 3 to 5 As shown, the battery pack in this embodiment of the application is further provided with at least one reinforcing plate 30, and at least one side of the reinforcing plate 30 is fixedly connected to the side of the battery body 21 of the adjacent battery row 22.

[0029] Since the reinforcing plate 30 is located adjacent to the battery row 22, at least one side of the reinforcing plate 30 is fixedly connected to the side of the battery body 21 of the adjacent battery row 22. That is, the reinforcing plate 30 extends along the first direction as a whole and is fixedly connected to the side of each battery body 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 reinforcing plate 30 can effectively provide support strength to reduce the deformation of the battery pack in the second direction of the present application embodiment.

[0030] like Figure 2 and Figure 4 As shown, in one embodiment of this application, at least one reinforcing plate 30 is located between adjacent battery rows 22, and the two sides of the reinforcing plate 30 are fixedly connected to the sides of the battery body 21 of the adjacent battery row 22. That is, a reinforcing plate 30 can be provided between adjacent battery rows 22. For the reinforcing plate 30 located between adjacent battery rows 22, the two sides of the reinforcing plate 30 are fixedly connected to the sides of the battery body 21 of the adjacent battery row 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.

[0031] It is understood that during the operation of the battery pack in this application embodiment, the battery body 21 of the battery pack may vibrate up and down along the height direction of the battery body 21 under the action of external force, and the movement amplitude of adjacent battery bodies 21 in the same battery row 22 cannot be kept completely consistent; and for the reinforcing plate 30 located between adjacent battery rows 22, the movement amplitude of the battery bodies 21 on both sides of the reinforcing plate 30 cannot be kept completely consistent.

[0032] Therefore, during the up-and-down vibration of the battery body 21, the battery body 21 will pull on the outer shell 211 of the adjacent battery body 21 through the reinforcing plate 30. As mentioned above, compared with other positions on the side of the battery body 21, the connection 213 between the outer shell 211 and the cover plate 212 is usually more fragile and has lower structural strength. Therefore, under prolonged vibration conditions, the reinforcing plate 30 can easily cause the outer shell 211 of the battery body 21 to move, which can easily lead to the connection 213 being torn by the reinforcing plate 30, resulting in dangerous situations such as leakage of the battery body 21, greatly reducing the operational safety of the battery pack. Furthermore, under vibration conditions, the up-and-down movement amplitude of the battery body 21 located in the middle area of ​​the battery row 22 is greater than that of the battery body 21 located at the edge area of ​​the battery row 22, making it more prone to dangerous situations such as the reinforcing plate 30 tearing and leakage of the battery body 21.

[0033] Therefore, as Figure 3 and Figure 5As shown, in the battery pack of this application embodiment, along the first direction, the reinforcing plate 30 is divided into a middle section 31 and edge sections 32 located on both sides of the middle section 31. In the height direction of the battery body 21, the top height of the middle section 31 is lower than the top height of the edge sections 32, and the top of the middle section 31 is configured to be located below the connecting portion 213.

[0034] In the battery pack of this application embodiment, even if the battery body 21 pulls on the outer shell 211 of the adjacent battery body 21 through the reinforcing plate 30, since the top height of the middle section 31 is lower than the top height of the edge section 32 in the height direction of the battery body 21, and the top of the middle section 31 of the reinforcing plate 30 is located below the connecting part 213, it is relatively difficult for the middle section 31 of the reinforcing plate 30 to pull on the adjacent position of the connecting part 213 on the side of the battery body 21 in the middle region of the battery row 22 when it vibrates up and down. This can effectively reduce the probability of leakage of the connecting part 213 on the side of the battery body 21 in the middle region of the battery row 22, thereby effectively reducing the probability of dangerous situations such as leakage of the battery body 21, and effectively improving the working safety of the battery pack of this application embodiment. Furthermore, since the top height of the middle section 31 is lower than the top height of the edge section 32, the edge section 32 of the reinforcing plate 30 can extend upward a longer distance, thereby increasing the coverage of the reinforcing plate 30 on the side of the battery body 21, effectively reducing the deformation of the battery body 21 when subjected to impact force in the second direction.

[0035] like Figure 3 As shown, in one embodiment of this application, the distance between the top of the middle section 31 and the connecting portion 213 in the height direction of the battery body 21 is h, in mm, and h satisfies 15mm≤h≤35mm.

[0036] When the distance h between the top of the middle section 31 of the reinforcing plate 30 and the connecting part 213 is less than 15mm, the distance between the top of the middle section 31 of the reinforcing plate 30 and the connecting part 213 is relatively close. When the middle section 31 of the reinforcing plate 30 vibrates up and down, it also has a relatively large impact on the connecting part 213 on the side of the battery body 21 in the middle area of ​​the battery row 22. When the distance h between the top of the middle section 31 of the reinforcing plate 30 and the connecting part 213 is greater than 35mm, the overall height of the middle section 31 of the reinforcing plate 30 is limited. When the upper part of the battery body 21 in the middle area of ​​the battery row 22 without the middle section 31 of the reinforcing plate 30 is subjected to the impact force along the second direction, it is easy to deform. Therefore, in the height direction of the battery body 21, the distance h between the top of the middle section 31 of the reinforcing plate 30 and the connecting part 213, where h satisfies 15mm≤h≤35mm, can effectively reduce the force exerted by the top of the middle section 31 of the reinforcing plate 30 on the connecting part 213 on the side of the battery body 21 in the middle region of the battery row 22, and can also effectively ensure the coverage area of ​​the middle section 31 of the reinforcing plate 30 on the side of the battery body 21, thereby effectively reducing the deformation of the battery body 21 in the middle region of the battery row 22 when subjected to an impact force along the second direction. In a specific embodiment, the distance h between the top of the middle section 31 of the reinforcing plate 30 and the connecting part 213 can be selected from specific values ​​such as 15mm, 18mm, 20mm, 24mm, 32mm, 35mm, etc., and is not limited here.

[0037] Furthermore, in one embodiment of this application, the intermediate segment 31 accounts for 50% to 80% of the length of the reinforcing plate 30. That is, as... Figure 3 As shown, along the first direction, the proportion of the middle section 31 of the reinforcing plate 30 ranges from 50% to 80%, and the proportion of the edge sections 32 on both sides ranges from 20% to 50%. Dividing the proportions of the middle section 31 and the edge sections 32 according to actual conditions can effectively reduce the probability of leakage at the connection portion 213 on the side of the battery body 21 in the middle region of the battery row 22 by limiting the length proportion of the middle section 31, thus improving the operational safety of the battery pack. Furthermore, by ensuring the length proportion of the edge sections 32, the coverage area of ​​the reinforcing plate 30 on the side of the battery body 21 is guaranteed, effectively reducing the deformation of the battery body 21 when subjected to impact forces along the second direction. In specific embodiments, the proportion of the middle section 31 to the length of the reinforcing plate 30 can be specific values ​​such as 50%, 60%, and 80%, and is not limited here.

[0038] In one embodiment of this application, the top end of the edge segment 32 is configured to be located below the connecting portion 213 in the height direction of the battery body 21. Since the top end of the edge segment 32 of the reinforcing plate 30 is located below the connecting portion 213 in the height direction of the battery body 21, it is less likely to pull the adjacent position of the connecting portion 213 on the side of the battery body 21 in the edge region of the battery row 22 when the edge segment 32 of the reinforcing plate 30 vibrates up and down. This can effectively reduce the probability of leakage of the connecting portion 213 on the side of the battery body 21 in the edge region of the battery row 22, thereby effectively reducing the probability of dangerous situations such as leakage of the battery body 21 and effectively improving the working safety of the battery pack in this embodiment of the application. Furthermore, in one embodiment of this application, the distance between the top end of the edge segment 32 and the connecting portion 213 in the height direction of the battery body 21 is f, in mm, where f satisfies 5mm ≤ f ≤ 15mm. When the distance f between the top end of the edge segment 32 and the connecting portion 213 in the height direction of the battery body 21 is greater than 5mm, the force exerted by the top end of the edge segment 32 of the reinforcing plate 30 on the connecting portion 213 on the side of the battery body 21 in the edge region of the battery row 22 can be effectively reduced. When the distance f between the top end of the edge segment 32 and the connecting portion 213 is less than 15mm, the coverage area of ​​the edge segment 32 of the reinforcing plate 30 corresponding to the side of the battery body 21 can be effectively guaranteed, thereby effectively reducing the deformation of the battery body 21 in the edge region of the battery row 22 when subjected to an impact force along the second direction. In specific embodiments, the distance f between the top end of the edge segment 32 of the reinforcing plate 30 and the connecting portion 213 can be selected from specific values ​​such as 5mm, 6mm, 8mm, 10mm, 13mm, and 15mm, and is not limited here.

[0039] Furthermore, such as Figure 3 and Figure 5 As shown, in one embodiment of this application, the height of the top of the reinforcing plate 30 continuously increases from the lowest point of the top edge of the middle section 31 to any end of the reinforcing plate 30 in the first direction. Since the height of the top of the reinforcing plate 30 continuously increases from the lowest point of the top edge of the middle section 31 to any end of the reinforcing plate 30 in the first direction, when the reinforcing plate 30 vibrates up and down, the influence of the reinforcing plate 30 on the connecting portion 213 on the side of the battery body 21 decreases sequentially from the edge of the battery row 22 to the middle of the battery row 22. This effectively counteracts the influence of the large vertical movement amplitude of the battery body 21 in the middle region of the battery row 22, thereby effectively reducing the probability of leakage at the connecting portion 213 on the side of the battery body 21 in the middle region of the battery row 22, improving the operational safety of the battery pack, and increasing the coverage area of ​​the reinforcing plate 30 on the side of the battery body 21, effectively reducing the deformation of the battery body 21 when subjected to impact forces along the second direction.

[0040] Specifically, such as Figure 3 and Figure 5 As shown, in one embodiment of this application, the top edge of the reinforcing plate 30 is a downwardly concave arc shape on the longitudinal section of the reinforcing plate 30; while in another embodiment of this application, the top edge of the reinforcing plate 30 is a downwardly concave zigzag shape on the longitudinal section of the reinforcing plate 30. When the top edge of the reinforcing plate 30 is a downwardly concave arc shape or a downwardly concave zigzag shape on the longitudinal section of the reinforcing plate 30, not only does the height of the top edge of the reinforcing plate 30 continuously increase from the lowest point of the top edge of the middle section 31 towards any end of the reinforcing plate 30 in the first direction, but the processing and cutting of the reinforcing plate 30 is also relatively simple, effectively improving the processing efficiency of the reinforcing plate 30.

[0041] like Figure 4 As shown, in one embodiment of this application, the thickness of the reinforcing plate 30 is d, in mm, where d satisfies 1mm ≤ d ≤ 3mm. When the thickness d of the reinforcing plate 30 is less than 1mm, the overall structural strength of the reinforcing plate 30 is low, resulting in a lower reinforcing effect on the battery pack in the second direction. When the thickness d of the reinforcing plate 30 is greater than 3mm, the space occupied by the reinforcing plate 30 is large, affecting the energy density of the battery pack in this embodiment. Therefore, when the thickness d of the reinforcing plate 30 satisfies 1mm ≤ d ≤ 3mm, it not only effectively ensures the overall structural strength of the reinforcing plate 30, thereby effectively improving the overall strength of the battery pack in the second direction, but also saves the space occupied by the reinforcing plate 30, effectively ensuring the energy density of the battery pack in this embodiment. In specific embodiments, the thickness d of the reinforcing plate 30 can be selected from specific values ​​such as 1mm, 1.2mm, 1.6mm, 2mm, 2.5mm, and 3mm, and is not limited here.

[0042] In one embodiment of this application, the reinforcing plate 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 reinforcing plate 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 reinforcing plate 30 can be effectively guaranteed, thereby effectively improving the overall strength of the battery pack in the second direction.

[0043] Specifically, such as Figure 4 As shown, in one embodiment of this application, the reinforcing plate 30 is bonded and fixed to the side of the battery body 21 by an adhesive layer 40. Since the reinforcing plate 30 is bonded and fixed to the side of the battery body 21 by the adhesive layer 40, the fixed connection between the reinforcing plate 30 and the side of each battery body 21 can be easily and conveniently achieved, thereby improving the assembly efficiency of the battery pack in this embodiment of the application.

[0044] Furthermore, in one embodiment of this application, the thickness of the adhesive layer 40 is j, in mm, where j satisfies 0.3mm ≤ j ≤ 2mm. When the thickness j of the adhesive layer 40 is less than 0.3mm, it is difficult to ensure a tight bond between the reinforcing plate 30 and the battery body 21 through the adhesive layer 40; when the thickness j of the adhesive layer 40 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 reinforcing plate 30 and the battery body 21 through the adhesive layer 40, thereby further improving the energy density of the battery pack in this embodiment. Furthermore, in one embodiment of this application, the thickness j of the adhesive layer 40 satisfies 0.5mm≤j≤1mm. When the thickness j of the adhesive layer 40 satisfies 0.5mm≤j≤1mm, it effectively improves the tight bonding between the reinforcing plate 30 and the battery body 21 through the adhesive layer 40, while effectively saving the space occupied by the adhesive layer 40, thereby further improving the energy density of the battery pack in this embodiment of the application.

[0045] In a specific embodiment, the thickness j of the adhesive layer 40 can be selected from specific values ​​such as 0.3mm, 0.4mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 2mm, etc., and is not limited here.

[0046] In one embodiment of this application, the adhesive strength of the adhesive layer 40 is t, in MPa, where t satisfies 2MPa≤t≤10MPa. When the adhesive strength t of the adhesive layer 40 is less than 2MPa, it is difficult to ensure a tight bond between the reinforcing plate 30 and the battery body 21 via the adhesive layer 40. Under prolonged vibration, some areas of the reinforcing plate 30 may detach from the battery body 21, thus affecting the overall structural stability of the battery pack in this embodiment. When the adhesive strength t of the adhesive layer 40 is greater than 10MPa, the adhesive force between the reinforcing plate 30 and the battery body 21 is too large, and the force exerted on the side of the battery body 21 by the reinforcing plate 30 during vertical vibration is also relatively large, easily affecting the strength of the side connection portion 213 of the battery body 21. Therefore, when the adhesive strength t of the adhesive layer 40 satisfies 2MPa≤t≤10MPa, it is possible to moderately reduce the force exerted by the top of the reinforcing plate 30 on the connecting portion 213 on the side of the battery body 21 while ensuring that the reinforcing plate 30 and the battery body 21 are tightly bonded through the adhesive layer 40. This reduces the probability of leakage at the connecting portion 213 on the side of the battery body 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, 6 MPa, 8 MPa, 9 MPa, and 10 MPa, and is not limited here.

[0047] 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 reinforcing plate 30 and the battery body 21 are tightly bonded through the adhesive layer 40.

[0048] In one embodiment of this application, an adhesive portion is provided on the bottom panel 11, and the bottom end of the reinforcing plate 30 is bonded to the adhesive portion on the bottom panel 11 of the pack body 10; the battery body 21 is bonded to the adhesive portion on the bottom panel 11 of the pack body 10. Therefore, when the battery pack is under vibration, the reinforcing plate 30, the battery body 21, and the bottom panel 11 of the pack body 10 can vibrate up and down synchronously, minimizing the force between the reinforcing plate 30 and the battery body 21, thereby further reducing the probability of leakage at the connection portion 213 on the side of the battery body 21, and effectively improving the working safety of the battery pack in this embodiment of the application.

[0049] Furthermore, such as Figure 2 As shown, in one embodiment of this application, the battery body 21 has a first side 2111 parallel to a first direction and a second side 2112 parallel to a second direction. At least one side of the reinforcing plate 30 is fixedly connected to the first side 2111 of the battery body 21 of the adjacent battery row 22. The width of the first side 2111 is smaller than the width of the second side 2112. That is, the first side 2111 is the smaller side of the battery body 21 in this embodiment of the application. The reinforcing plate 30 is fixedly connected to the smaller side of the battery body 21, which can further reduce the probability of the connection part 213 being torn by the reinforcing plate 30, thereby reducing the probability of dangerous situations such as leakage of the battery body 21, and effectively improving the working safety of the battery pack in this embodiment of the application.

[0050] like Figure 6 As shown, in one embodiment of this application, an insulating member 214 is provided on the first side 2111, and at least a portion of the reinforcing plate 30 is fixedly connected to the insulating member 214. That is, at least a portion of the reinforcing plate 30 in this embodiment of the application can be fixedly connected to the insulating member 214 of the battery body 21 to achieve a fixed connection between the reinforcing plate 30 and the battery body 21.

[0051] It is understood that the aforementioned insulating component 214 can be any of the following: insulating sheet, insulating film, insulating coating, or layered structure with insulating and high-temperature resistance properties: alumina layer, boron nitride layer, titanium carbide layer, etc., without limitation. The insulating film can be made of polyester film (PET, Polyethylene Terephthalate), polyimide (PI), polypropylene (PP), or polyethylene (PE). The insulating coating can be made of (1) modified epoxy resin; (2) polyacrylate; (3) polyethylene phthalate (PET); (4) oil-based insulating resin or water-based insulating resin, etc. The main insulating resin includes epoxy resin, acrylic resin, polyurethane resin, hydroxyl acrylic resin and other multifunctional resins; (5) polyimide coating or insulating coating formed by polymers such as polyimide (PI) and epoxy resin; (6) styrene-butadiene rubber emulsion. The insulating component 214 can be attached to the surface of the battery body 21 by adhesive or coating.

[0052] Furthermore, such as Figure 6 As shown, in one embodiment of this application, an opening area 215 is provided on the insulating member 214, and the outer casing of the battery body 21 is exposed at the location of the opening area 215; at least a portion of the reinforcing plate 30 is fixedly connected to the opening area 215. That is, the opening area 215 is a portion of the insulating member 214 (e.g., the blue film covering the outer casing), in which the outer casing of the battery body 21 is directly exposed, and the reinforcing plate 30 can be directly fixed to the outer casing of the battery body 21 exposed in the opening area 215. Since at least a portion of the reinforcing plate 30 is fixedly connected to the window area 215, the outer casing of the battery body 21 at the window area 215 is exposed; that is, at least a portion of the reinforcing plate 30 can be directly fixedly connected to the outer casing 211 of the battery body 21; compared with the portion where the reinforcing plate 30 is fixedly connected to the insulating member 214 of the battery body 21, the connection strength of the portion where the reinforcing plate 30 is fixedly connected to the insulating member 214 of the battery body 21 is higher. Therefore, the fixed connection strength between the reinforcing plate 30 and the battery body 21 can be effectively improved, and the situation of relative separation between the reinforcing plate 30 and the battery body 21 can be avoided, so as to ensure the structural stability of the battery pack of this application embodiment.

[0053] Furthermore, such as Figure 6 As shown, in one embodiment of this application, on the side of the battery body 21 where the window area 215 is provided, the area of ​​the window area 215 is c, in mm. 2 The area of ​​the first side surface 2111 is k, in mm. 2 c / k satisfies 0.5≤c / k≤0.8.

[0054] When the ratio c / k of the area c of the window area 215 and the area k of the first side surface 2111 is less than 0.5, it is difficult to ensure a stable connection between the reinforcing plate 30 and the battery body 21; when the ratio c / k of the area c of the window area 215 and the area k of the first side surface 2111 is greater than 0.8, it is difficult to ensure the coverage area of ​​the insulating component 214 on the first side surface 2111, affecting the insulation performance of the insulating component 214 on the first side surface 2111 and posing a risk of insulation failure.

[0055] Therefore, when the ratio c / k of the area c of the window area 215 and the area k of the first side surface 2111 satisfies 0.5 ≤ c / k ≤ 0.8, it can ensure both the stable connection between the reinforcing plate 30 and the battery body 21 and the coverage area of ​​the insulating component 214 on the first side surface 2111, thereby ensuring the insulation performance of the insulating component 214 on the first side surface 2111. In specific embodiments, the ratio c / k of the area c of the window area 215 and the area k of the first side surface 2111 can be selected from specific values ​​such as 0.5, 0.6, 0.65, 0.7, 0.8, etc., and is not limited here.

[0056] Furthermore, in one embodiment of this application, on the first side 2111, the top of the window area 215 is lower than the top of the reinforcing plate 30. Since the top of the window area 215 on the first side 2111 is lower than the top of the reinforcing plate 30, it can be ensured that the window area 215 can be completely covered by the reinforcing plate 30, avoiding the outer casing at the window area 215 being exposed, thereby effectively preventing short circuits at the window area 215 of the battery body 21 and ensuring that the outer casing 211 of the battery body 21 is insulated from other structures.

[0057] Furthermore, in one embodiment of this application, the distance between the top of the window area 215 and the top of the reinforcing plate 30 on the first side 2111 is e, in mm, where e satisfies 5mm ≤ e ≤ 10mm. Since the distance e between the top of the window area 215 and the top of the reinforcing plate 30 on the first side 2111 satisfies 5mm ≤ e ≤ 10mm, it can further ensure that the window area 215 is completely covered by the reinforcing plate 30, preventing short circuits at the window area 215 of the battery body 21 and ensuring that the outer shell 211 of the battery body 21 is insulated from other structures; it can also effectively ensure the area occupied by the window area 215, thereby ensuring a stable connection between the reinforcing plate 30 and the battery body 21. In specific embodiments, the distance e between the top of the window area 215 and the top of the reinforcing plate 30 can be selected from specific values ​​such as 5mm, 6mm, 6.5mm, 8mm, 9mm, and 10mm, and is not limited here.

[0058] 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.

[0059] like Figure 2 As shown, in one embodiment of this application, the package body 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 outer frame 12 and / or the bottom panel 11. By providing a reinforcing beam 13 extending along the first direction of the battery pack within the package body 10 of this application embodiment, and by fixing the reinforcing beam 13 to the outer frame 12 and / or the bottom panel 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.

[0060] Understandably, the reinforcing beam 13 can be a strip structure, with both ends connected to the two sides of the outer frame 12 of the package 10, respectively, to divide the interior of the package 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 other methods such as extrusion molding, and then connected to the package 10 by welding.

[0061] Furthermore, such as Figure 2 As shown, in one embodiment of this application, a reinforcing beam 13 is configured within the accommodating cavity to divide the battery compartment 14 and the electrical compartment 15; the battery array 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.

[0062] 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 array 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 body 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 applied to electric vehicles and other equipment.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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" 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.

[0067] 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.

[0068] 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.

[0069] 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: Package (10), the package (10) includes a bottom panel (11) and an outer frame (12), the outer frame (12) is fixed to the outer periphery of the bottom panel (11), the bottom panel (11) and the outer frame (12) together form an accommodating cavity; A battery array (20) is disposed in the cavity and includes multiple battery bodies (21). The multiple battery bodies (21) are arranged in an array along a first direction and along a second direction. The first direction, the second direction, and the height direction of the battery bodies (21) are perpendicular to each other. The battery bodies (21) arranged along the first direction form a battery row (22). At least one reinforcing plate (30) is fixedly connected to at least one side of the reinforcing plate (30) to the side of the battery body (21) of the adjacent battery row (22); The battery body (21) includes at least a shell (211) and a cover plate (212) fixedly connected to each other, and a connecting portion (213) is provided between the shell (211) and the cover plate (212) on the side of the battery body (21); along the first direction, the reinforcing plate (30) is divided into a middle section (31) and edge sections (32) located on both sides of the middle section (31). In the height direction of the battery body (21), the top height of the middle section (31) is lower than the top height of the edge section (32), and the top of the middle section (31) is configured to be located below the connecting portion (213).

2. The battery pack according to claim 1, characterized in that, In the height direction of the battery body (21), the distance between the top of the middle section (31) and the connecting part (213) is h, in mm, and h satisfies 15mm≤h≤35mm.

3. The battery pack according to claim 1, characterized in that, In the first direction, the proportion of the middle section (31) to the length of the reinforcing plate (30) ranges from 50% to 80%.

4. The battery pack according to claim 1, characterized in that, In the height direction of the battery body (21), the top end of the edge segment (32) is configured to be located below the connecting portion (213).

5. The battery pack according to claim 4, characterized in that, In the height direction of the battery body (21), the distance between the top of the edge segment (32) and the connecting part (213) is f, in mm, and f satisfies 5mm≤f≤15mm.

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

7. The battery pack according to claim 1, characterized in that, From the lowest point of the top edge of the middle section (31) toward any end of the reinforcing plate (30) in the first direction, the height of the top of the reinforcing plate (30) continuously increases.

8. The battery pack according to claim 7, characterized in that, On the longitudinal section of the reinforcing plate (30), the top edge of the reinforcing plate (30) is a downwardly concave arc shape or a downwardly concave zigzag shape.

9. The battery pack according to any one of claims 1 to 8, characterized in that, The thickness of the reinforcing plate (30) is d, in mm, and d satisfies 1mm≤d≤3mm.

10. The battery pack according to any one of claims 1 to 8, characterized in that, The reinforcing plate (30) is constructed to be made of at least one of epoxy resin plate, polypropylene plastic plate, and composite plastic plate.

11. The battery pack according to any one of claims 1 to 8, characterized in that, At least one of the reinforcing plates (30) is located between adjacent battery rows (22), and the two sides of the reinforcing plate (30) are fixedly connected to the sides of the battery body (21) of the adjacent battery row (22).

12. The battery pack according to any one of claims 1 to 8, characterized in that, An adhesive part is provided on the bottom panel (11), and the bottom end of the reinforcing plate (30) is bonded to the adhesive part on the bottom panel (11) of the package (10); the battery body (21) is bonded to the adhesive part on the bottom panel (11) of the package (10).

13. The battery pack according to any one of claims 1 to 8, characterized in that, The battery body (21) has a first side (2111) parallel to a first direction and a second side (2112) parallel to a second direction. At least one side of the reinforcing plate (30) is fixedly connected to the first side (2111) of the battery body (21) of the adjacent battery row (22). The width of the first side (2111) is smaller than the width of the second side (2112).

14. The battery pack according to claim 13, characterized in that, An insulating element (214) is provided on the first side (2111), and at least a portion of the reinforcing plate (30) is fixedly connected to the insulating element (214).

15. The battery pack according to claim 14, characterized in that, The insulating component (214) is provided with a window area (215), and the outer shell of the battery body (21) is exposed at the location of the window area (215); at least a portion of the reinforcing plate (30) is fixedly connected to the window area (215).

16. The battery pack according to claim 15, characterized in that, On the side of the battery body (21) where the window area (215) is provided, the area of ​​the window area (215) is c, in mm. 2 The area of ​​the first side surface (2111) is k, in mm. 2 c / k satisfies 0.5≤c / k≤0.

8.

17. The battery pack according to claim 15, characterized in that, On the first side (2111), the top of the window area (215) is lower than the top of the reinforcing plate (30).

18. The battery pack according to claim 17, characterized in that, On the first side (2111), the distance between the top of the window area (215) and the top of the reinforcing plate (30) is e, in mm, and e satisfies 5mm≤e≤10mm.

19. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 18.

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