Battery pack and electric device

Abstract

The application provides a battery pack and an electric device. The battery pack comprises a containing box, a battery cluster, at least one partition plate and at least one baffle. The battery cluster comprises a plurality of sub-batteries arranged in an array along a first direction and a second direction in a containing cavity. The sub-batteries comprise a lower shell and an upper cover plate fixedly connected with each other. The lower shell and the upper cover plate are fixedly connected through a fixed connection part. At least one side surface of the at least one partition plate is fixedly connected to a side surface of the sub-batteries of adjacent battery rows. The partition plate is divided into a first partition section and a second partition section. The first partition section is located above the second partition section. A projection of the first partition section on the side surface of the sub-batteries covers a corresponding position of the fixed connection part. The baffle is arranged between the first partition section and the sub-batteries. A top portion of the baffle is provided with an extension part extending towards the upper cover plate. The extension part is fixedly connected to the upper cover plate. A cavity is formed between the baffle and the lower shell. The fixed connection part is located in the cavity.

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 outer casing of a battery typically consists of a lower casing and an upper cover. The lower casing primarily houses the electrolyte and battery cells, and its design must combine high rigidity, lightweight, and corrosion resistance. The upper cover usually integrates key components such as terminals, explosion-proof valves, and electrolyte filling holes. The lower casing and upper cover are typically connected by welding, with the upper cover fixedly attached to the opening in the lower casing. Therefore, the connection between the lower casing and the upper cover often contains weld lines.

[0003] To improve the overall structural strength of the battery pack, separators can be fixed to the sides of the entire array of sub-cells. However, under prolonged vibration, the separators can easily cause the lower casing of the sub-cells to move, potentially leading to tearing of the weld between the upper cover and lower casing, resulting in leakage and other dangerous situations. The leaked electrolyte can rapidly corrode surrounding metal, damage insulation between sub-cells, create conductive paths within the pack, causing short circuits, and even trigger thermal runaway in adjacent cells, potentially leading to fire or even explosion, significantly reducing the battery 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 upper cover plate and the lower shell of the sub-battery in the existing battery pack is easily torn by the separator, which leads to dangerous situations such as leakage of the sub-battery and affects the working safety of the battery pack.

[0005] The first aspect of this application provides a battery pack, comprising: A receiving box, the receiving box including a base plate and a frame that are fixedly connected to each other, and the base plate and the frame of the receiving box together form a receiving cavity; A battery cluster, comprising multiple sub-cells disposed within the receiving cavity and arranged in an array along a first direction and a second direction, wherein the height direction, the first direction, and the second direction of the sub-cells are perpendicular to each other, and the sub-cells arranged along the first direction form a battery row; each sub-cell includes at least a lower housing and an upper cover plate fixedly connected to each other, and the lower housing and the upper cover plate are fixedly connected on the side of the sub-cell by a fixing part; At least one separator, at least one side of which is fixedly connected to the side of a sub-cell of an adjacent battery row; in the height direction of the battery, the separator is divided into a first dividing segment and a second dividing segment, the first dividing segment being located above the second dividing segment, and the projection of the first dividing segment on the side of the sub-cell covering the corresponding position of the fixed portion. At least one baffle is provided between the first dividing section and the sub-battery. The top of the baffle is provided with an extension extending toward the upper cover plate, and the extension is fixedly connected to the upper cover plate. A cavity is formed between the baffle and the lower housing, and the fixed connection part is located in the cavity.

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

[0007] In the battery pack of this application embodiment, since the top of the baffle is provided with an extension extending upward to the upper cover plate, and the extension is fixedly connected to the upper cover plate, the position of the baffle can be fixed by the extension, thereby ensuring that the baffle is located between the first partition section and the sub-battery. By setting the baffle between the first partition section and the sub-battery, the baffle can be used to separate the first partition section and the sub-battery. The first partition section and the sub-battery are not fixedly connected. When the partition vibrates up and down, the first partition section will not pull the adjacent position of the fixed part on the side of the sub-battery, thereby effectively reducing the probability of leakage at the fixed part on the side of the sub-battery, and thus effectively reducing the probability of dangerous situations such as leakage of the sub-battery, effectively improving the working safety of the battery pack of this application embodiment.

[0008] Furthermore, a cavity is formed between the baffle and the lower shell, and the fixed part is located inside the cavity. This allows the fixed part to be protected by the baffle and the lower shell, preventing physical contact between the fixed part and other structures.

[0009] Furthermore, the entire separator can completely cover the sides of the sub-cells in the adjacent battery row, which can effectively improve the structural strength of the battery pack in the second direction of this application embodiment; when the sub-cells are subjected to pressure in the second direction at various positions in the height direction, the separator can effectively provide support strength, greatly reducing the deformation of the battery pack in the second direction of this application embodiment. Attached Figure Description

[0010] 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.

[0011] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0012] 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.

[0013] Figure 1 This is a perspective view of the battery pack according to an embodiment of this application.

[0014] Figure 2 This is a front view of the battery pack according to an embodiment of this application.

[0015] Figure 3 This is a partial cross-sectional schematic diagram of the battery pack according to an embodiment of this application.

[0016] Figure 4 This is another cross-sectional schematic diagram of the battery pack according to an embodiment of this application.

[0017] Figure 5 This is a three-dimensional schematic diagram of the partition and adhesive layer in an embodiment of this application.

[0018] Figure 6 This is another cross-sectional schematic diagram of the battery pack according to an embodiment of this application.

[0019] Attached image labels: 10. Storage box; 11. Base plate; 12. Frame; 13. Reinforcing beam; 14. Battery compartment; 15. Electrical compartment; 20. Battery cluster; 21. Sub-battery; 211. Lower casing; 212. Upper cover; 213. Fixing part; 22. Battery row; 23. Insulating plate; 230. Baffle; 231. Extension; 232. Cavity; 30. Partition; 31. First partition section; 32. Second partition section; 40. Adhesive layer; 41. First adhesive portion; 42. Second adhesive portion.

[0020] X - First direction; Y - Second direction; Z - Height direction. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] like Figures 1 to 5 As shown, this application provides a battery pack, which includes at least a housing 10 and a battery cluster 20 disposed within the housing 10. The housing 10 includes a base plate 11 and a frame 12 fixedly connected to each other, and the base plate 11 and the frame 12 together form a receiving cavity. The receiving cavity is used to accommodate various structures required for the battery pack.

[0024] Specifically, a battery pack can be a battery array composed of multiple sub-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. All these components are housed within the pack and sealed with a top 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.

[0025] 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 cluster 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 cluster 20, BMS, cooling system, electrical fasteners 213, etc., and through a reasonable structural design, fixes these components inside the housing 10 to ensure that they maintain a relatively stable position during battery pack operation, avoiding damage to components or loosening of connections due to vibration, impact, or other factors.

[0026] The receiving box 10 may include a lower receiving box and an upper receiving box. The lower receiving box includes a base plate 11 and a frame 12 connected to and surrounding the base plate 11. The upper receiving box is connected to the frame 12 and has an upper cover plate 212 opposite to the base plate 11. The upper and lower receiving boxes together form a receiving cavity. The frame 12 and the base plate 11 can be integrally formed or formed by separate processing and then fixed connection. Specifically, the frame 12 and the base plate 11 are fixedly connected by welding, riveting, screwing, etc. When the receiving box 10 is a cube, the frame 12 of the lower receiving box generally has four side plates, which surround the periphery of the base plate 11. In other embodiments, the shape of the receiving box 10 may also be a cylinder or other shapes. The frame 12 mainly serves to support, protect, and connect. The frame 12 may be formed by splicing multiple beams together. The frame 12 may be rectangular, circular, polygonal, etc., without limitation. The beams of the frame 12 may have a solid structure inside or contain cavities. The base plate 11 is the main load-bearing component of the battery pack, used to support and fix the battery clusters 20, battery management system, cooling system, and other components inside the battery pack. The base plate 11 can be rectangular, circular, polygonal, or plate-like; its specific 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.

[0027] Specifically, such as Figure 1 and Figure 2 As shown, the battery cluster 20 includes multiple sub-batteries 21, which are disposed in the receiving cavity and arranged in an array along the first direction and the second direction. The height direction, the first direction, and the second direction of the sub-batteries 21 are perpendicular to each other. The sub-batteries 21 arranged along the first direction form a battery row 22.

[0028] The sub-battery 21 includes at least a lower housing 211 and an upper cover plate 212 fixedly connected to each other. The lower housing 211 and the upper cover plate 212 are fixedly connected on the side of the sub-battery 21 via a fixing part 213. It is understood that the sub-battery 21 in this embodiment may also include a battery cell and an electrolyte. The lower housing 211 and the upper cover plate 212 are used together to accommodate the battery cell and the electrolyte. The upper cover plate 212 may be provided with at least one positive terminal and at least one negative terminal for electrical connection to the outside.

[0029] In one embodiment of this application, the lower housing 211 and the upper cover plate 212 are welded together, and the fixed connection 213 is the weld formed by welding the lower housing 211 and the upper cover plate 212.

[0030] When the lower housing 211 and the upper cover plate 212 are fixedly connected to each other by bonding, riveting, or other fixing methods, the fixing part 213 has a different structure. It is understood that, compared to other locations on the side of the sub-battery 21, the fixing 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 sub-battery 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 sub-battery 21 can store chemical energy and controllably convert chemical energy into electrical energy. For recyclable sub-batteries 21, the active materials can be activated by charging after discharge so that they can continue to be used.

[0031] 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 of this embodiment is further provided with at least one partition 30, and at least one side of the partition 30 is fixedly connected to the side of the sub-battery 21 of the adjacent battery row 22.

[0032] 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 sub-battery 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 sub-battery 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.

[0033] like Figure 2 and Figure 4 As shown, in one embodiment of this application, at least one separator 30 is located between adjacent battery rows 22, and both sides of the separator 30 are fixedly connected to the sides of the sub-batteries 21 of the adjacent battery rows 22. That is, separators 30 can be provided between adjacent battery rows 22. For separators 30 located between adjacent battery rows 22, both sides of the separator 30 are fixedly connected to the sides of the sub-batteries 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.

[0034] It is understood that during the operation of the battery pack in the embodiments of this application, the sub-cells 21 of the battery pack may vibrate up and down along the height direction of the sub-cells 21 under the action of external force, and the movement amplitude of adjacent sub-cells 21 in the same battery row 22 cannot be kept completely consistent; and for the separator 30 located between adjacent battery rows 22, the movement amplitude of the sub-cells 21 on both sides of the separator 30 cannot be kept completely consistent.

[0035] Therefore, during the up-and-down vibration of the sub-battery 21, the sub-battery 21 will pull on the lower casing 211 of the adjacent sub-battery 21 through the separator 30. As mentioned above, compared with other positions on the side of the sub-battery 21, the fixed part 213 between the lower casing 211 and the upper 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 lower casing 211 of the sub-battery 21 to move, which can easily cause the fixed part 213 to be torn by the separator 30, resulting in dangerous situations such as leakage of the sub-battery 21, which greatly reduces the working safety of the battery pack.

[0036] Therefore, as Figure 4 As shown, in the battery pack of this embodiment, the separator 30 is divided into a first dividing segment 31 and a second dividing segment 32 in the height direction of the battery. The first dividing segment 31 is located above the second dividing segment 32. The projection of the first dividing segment 31 on the side of the sub-battery 21 covers the corresponding position of the fixed connection portion 213. The battery pack of this embodiment also includes at least one baffle 230. The baffle 230 is disposed between the first dividing segment 31 and the sub-battery 21. The top of the baffle 230 is provided with an extension portion 231 extending upward to the upper cover plate 212, and the extension portion 231 is fixedly connected to the upper cover plate 212. A cavity 232 is formed between the baffle 230 and the lower housing 211, and the fixed connection portion 213 is located in the cavity 232.

[0037] In the battery pack of this embodiment, since the top of the baffle 230 is provided with an extension 231 extending upward to the cover plate 212, and the extension 231 is fixedly connected to the cover plate 212, the position of the baffle can be fixed by the extension 231, thereby ensuring that the baffle 230 is located between the first partition section 31 and the sub-battery 21. By providing the baffle 230 between the first partition section 31 and the sub-battery 21, the baffle can be used to separate the first partition section 31 and the sub-battery 21. The first partition section 31 and the sub-battery 21 are not fixedly connected. When the partition 30 vibrates up and down, the first partition section 31 will not pull the adjacent position of the fixed part 213 on the side of the sub-battery 21, thereby effectively reducing the probability of leakage of the fixed part 213 on the side of the sub-battery 21, and thus effectively reducing the probability of dangerous situations such as leakage of the sub-battery 21, effectively improving the working safety of the battery pack of this embodiment.

[0038] Furthermore, a cavity 232 is formed between the baffle 230 and the lower housing 211, and the fixed part 213 is located in the cavity 232. Thus, the fixed part 213 can be protected by the baffle 230 and the lower housing 211 to prevent physical contact between other structures and the fixed part 213.

[0039] Furthermore, the entire separator 30 can cover the sides of the sub-batteries 21 of the adjacent battery row 22, which can effectively improve the structural strength of the battery pack in the second direction of this application embodiment; when the sub-batteries 21 are subjected to pressure in the second direction at various positions in the height direction, the separator 30 can effectively provide support strength, greatly reducing the deformation of the battery pack in the second direction of this application embodiment.

[0040] like Figure 4 and Figure 6 As shown, in one embodiment of this application, a gap c, in mm, is provided between the baffle 230 and the sub-battery 21, where c satisfies 0.3mm ≤ c ≤ 1mm. When the gap c between the baffle 230 and the sub-battery 21 is less than 0.3mm, the width of the cavity 232 is too small. If the baffle 230 or the lower housing 211 of the sub-battery 21 undergoes slight deformation, the baffle 230 and the fixing part 213 may easily come into contact, potentially damaging the fixing part 213. Conversely, when the gap c between the baffle 230 and the sub-battery 21 is greater than 1mm, the width of the cavity 232 is too large, easily wasting space and affecting the energy density of the battery pack.

[0041] Therefore, when the interval c between the baffle 230 and the sub-battery 21 satisfies 0.3mm ≤ c ≤ 1mm, not only can the baffle 230 and the fixing part 213 be effectively prevented from contacting each other even when the lower shell 211 of the baffle 230 or the sub-battery 211 undergoes slight deformation, thus preventing damage to the fixing part 213 and improving the working safety of the battery pack, but it can also effectively save space and increase the energy density of the battery pack. In specific embodiments, the interval c between the baffle 230 and the sub-battery 21 can be selected from specific values ​​such as 0.3mm, 0.5mm, 0.6mm, 0.8mm, and 1mm, and is not limited here.

[0042] like Figure 4 and Figure 6 As shown, in one embodiment of this application, the thickness of the baffle 230 is e, in mm, and e satisfies 0.5mm ≤ e ≤ 1.2mm. When the thickness e of the baffle 230 is less than 0.5mm, the structural strength of the baffle 230 is low, and it is prone to deformation, which can easily lead to contact between the baffle 230 and the fixed part 213, causing damage to the fixed part 213. When the thickness e of the baffle 230 is greater than 1.2mm, the baffle 230 occupies more space, affecting the energy density of the battery pack.

[0043] Therefore, when the thickness e of the baffle 230 satisfies 0.5mm ≤ e ≤ 1.2mm, not only can the structural strength of the baffle 230 be improved, the deformation of the baffle 230 be reduced, and the contact between the baffle 230 and the fixed part 213 be minimized, thus improving the working safety of the battery pack, but the space occupied by the baffle 230 can also be effectively saved, thereby increasing the energy density of the battery pack. In specific embodiments, the thickness e of the baffle 230 can be selected from specific values ​​such as 0.5mm, 0.6mm, 0.8mm, 1mm, and 1.2mm, and is not limited here.

[0044] like Figure 6 As shown, in one embodiment of this application, the top surface height of the baffle 230 is higher than the top surface height of the separator 30 in the height direction of the battery. Since the top surface height of the baffle 230 is higher than the top surface height of the separator 30, it can be ensured that the baffle 230 can cover the top part of the separator 30 and be fixedly connected to the upper cover plate 212 by means of the extension 231. Furthermore, a cavity 232 is formed between the baffle 230 and the top part of the lower housing 211, thereby surrounding the fixed part 213 within the cavity 232.

[0045] In one embodiment of this application, the baffle 230 is an insulating plate 23. When the baffle is an insulating plate 23, the insulation performance of the side of the sub-battery 21 can be effectively improved, reducing the probability of short circuits between the sub-battery 21 and adjacent sub-batteries, the housing 10, or other structures. Furthermore, even if the separator 30 causes the lower housing 211 of the sub-battery 21 to move, resulting in tearing of the fixed connection 213 and leakage of the sub-battery 21, the insulating plate 23 can minimize the risk of the leaked electrolyte forming a conductive path within the battery pack, thus preventing a short circuit and improving the operational safety of the battery pack. It is understood that the insulating plate 23 can be an insulating film, insulating plate, or other component with insulating function, and this is not limited thereto.

[0046] like Figure 6 As shown, in one embodiment of this application, the baffle 230 is an L-shaped plate. The L-shaped plate structure facilitates the formation of the portion located between the first dividing section 31 and the sub-battery 21, as well as the extension 231 that is fixedly connected to the upper cover plate 212.

[0047] like Figure 6 As shown, in one embodiment of this application, multiple baffles 230 are provided, and one baffle 230 is provided on each side of each sub-battery 21. Therefore, the fixing portions 213 on both sides of each sub-battery 21 can be protected by the baffles 230, preventing the fixing portions 213 on both sides of the sub-battery 21 from being torn by the separator 30, thereby further improving the working safety of the battery pack.

[0048] Specifically, such as Figure 6 As shown, in one embodiment of this application, the distance between the bottom end of the first dividing segment 31 and the fixed part 213 in the height direction of the sub-battery 21 is h, in mm, and h satisfies 10 mm ≤ h ≤ 30 mm.

[0049] When the distance h between the bottom end of the first dividing section 31 and the fixed part 213 is less than 10 mm, the distance between the bottom end of the baffle 230 and the fixed part 213 is relatively close, and the vibration of the separator 30 up and down also has a relatively large impact on the fixed part 213 on the side of the sub-battery 21. When the distance h between the bottom end of the first dividing section 31 and the fixed part 213 is greater than 30 mm, the coverage area of ​​the first dividing section 31 of the separator 30 is too large. Under long-term vibration conditions, the separator 30 in some areas is prone to detach from the sub-battery 21, thereby affecting the overall structural stability of the battery pack in this application embodiment.

[0050] Therefore, in the height direction of the sub-battery 21, the distance h between the bottom end of the first dividing section 31 and the fixed connection part 213, satisfying 10 mm ≤ h ≤ 30 mm, can effectively reduce the force exerted by the bottom end of the first dividing section 31 on the fixed connection part 213 on the side of the sub-battery 21, and effectively ensure the fixed connection between the separator 30 and the sub-battery 21, thereby improving the overall structural stability of the battery pack. In a specific embodiment, the distance h between the bottom end of the first dividing section 31 and the fixed connection part 213 can be selected from specific values ​​such as 10 mm, 15 mm, 20 mm, 24 mm, and 30 mm, and is not limited here.

[0051] In one embodiment of this application, the extension length of the baffle 230 in the height direction of the sub-battery 21 is less than the extension length of the first dividing segment 31. Since the extension length of the baffle 230 in the height direction of the sub-battery 21 is less than the extension length of the first dividing segment 31, and the extension 231 is fixedly connected to the upper cover plate 212, it can be ensured that the bottom end of the baffle 230 will not exceed the bottom end of the first dividing segment 31 in the height direction of the sub-battery 21, and there will be no mutual interference between the baffle 230 and the second dividing segment 32, and the baffle 230 will not be inserted between the second dividing segment 32 and the sub-battery 21.

[0052] Specifically, in the height direction of the battery, the first dividing segment 31 accounts for 8% to 20% of the height of the separator 30. That is... Figure 4As shown, along the height direction, the proportion of the first dividing segment 31 ranges from 8% to 20%, and the proportion of the second dividing segment 32 ranges from 80% to 92%. Dividing the height proportions of the first dividing segment 31 and the second dividing segment 32 according to actual conditions can effectively reduce the probability of leakage at the fixing part 213 on the side of the sub-battery 21 by limiting the height proportion of the first dividing segment 31, thus improving the operational safety of the battery pack; and by ensuring the height proportion of the second dividing segment 32, it can ensure the fixed connection between the separator 30 and the sub-battery 21, thereby improving the overall structural stability of the battery pack. In specific embodiments, the proportion of the first dividing segment 31 in the height of the separator 30 can be selected from specific values ​​such as 8%, 10%, 12%, 15%, and 20%, etc., and is not limited here.

[0053] like Figure 4 and Figure 6 As shown, in one embodiment of this application, the thickness of the separator 30 is d, in mm, where d satisfies 1mm ≤ d ≤ 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 ≤ d ≤ 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, 1.6mm, 2mm, 2.5mm, and 3mm, and is not limited here.

[0054] like Figure 6 As shown, in one embodiment of this application, in the height direction of the sub-battery 21, the top end of the separator 30 is flush with the top surface of the upper cover plate 212, and the distance between the top end of the separator 30 and the fixing part 213 is 1-2 mm. In this way, the entire separator 30 can completely cover the side of the sub-battery 21 of the adjacent battery row 22, improving the structural strength of the battery pack in the second direction. In another embodiment of this application, in the height direction of the sub-battery 21, the top end of the separator 30 is flush with the fixing part 213. In this way, the top end of the separator 30 will not press against the fixing part 213, and the fixing part 213 can also be prevented from deforming under the force in the second direction.

[0055] Specifically, such as Figure 4 and Figure 5As shown, in one embodiment of this application, the separator 30 is bonded and fixed to the side of the sub-battery 21 by an adhesive layer 40. Since the separator 30 is bonded and fixed to the side of the sub-battery 21 by the adhesive layer 40, the fixed connection between the separator 30 and the side of each sub-battery 21 can be easily and conveniently achieved, thereby improving the assembly efficiency of the battery pack in this embodiment of the application.

[0056] Specifically, such as Figure 5 and Figure 6 As shown, in one embodiment of this application, the adhesive layer 40 includes a first adhesive portion 41 and a second adhesive portion 42; the first partition segment 31 is bonded to the side of the baffle 230 through the first adhesive portion 41, and the second partition segment 32 is bonded and fixed to the side of the sub-battery 21 through the second adhesive portion 42, thereby achieving a fixed connection between the first partition segment 31, the second partition segment 32 and the sub-battery 21.

[0057] like Figure 6 As shown, in one embodiment of this application, the thickness of the first adhesive portion 41 is less than the thickness of the second adhesive portion 42. Since the thickness of the first adhesive portion 41 is less than the thickness of the second adhesive portion 42, the thickness of the first adhesive portion 41 can be controlled to leave a space between the first dividing section 31 and the sub-battery 21. This space is used to accommodate the baffle 230 and the cavity 232, thereby effectively serving as a spacer.

[0058] 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 sub-battery 21 are tightly bonded through the adhesive layer 40. Under long-term vibration conditions, some areas of the separator 30 may detach from the sub-battery 21, thereby 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 10 MPa, the adhesive force between the separator 30 and the sub-battery 21 is too large, and the force exerted on the side of the sub-battery 21 when the separator 30 vibrates up and down is also relatively large, which can easily affect the strength of the side fixing part 213 of the sub-battery 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 fixed portion 213 on the side of the sub-battery 21 can be appropriately reduced while ensuring that the separator 30 and the sub-battery 21 are tightly bonded through the adhesive layer 40. This reduces the probability of leakage at the fixed portion 213 on the side of the sub-battery 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, 4 MPa, 5 MPa, 8 MPa, and 10 MPa, and is not limited here.

[0059] 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 sub-cell 21 are tightly bonded through the adhesive layer 40.

[0060] like 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 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 can be effectively improved. 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. Further, 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 cluster 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.

[0061] 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 a battery disconnection unit (BDU), a battery management system (BMS), and input / output interfaces. Since the battery cluster 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 sub-battery 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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 container (10) includes a base plate (11) and a frame (12) that are fixedly connected to each other, and the base plate (11) and the frame (12) of the container (10) together form a receiving cavity; A battery cluster (20) includes multiple sub-batteries (21), which are disposed in the receiving cavity and arranged in an array along a first direction and a second direction. The height direction, the first direction, and the second direction of the sub-batteries (21) are perpendicular to each other. The sub-batteries (21) arranged along the first direction form a battery row (22). Each sub-battery (21) includes at least a lower housing (211) and an upper cover plate (212) that are fixedly connected to each other. On the side of the sub-battery (21), the lower housing (211) and the upper cover plate (212) are fixedly connected by a fixing part (213). At least one separator (30) is fixedly connected to the side of a sub-battery (21) of an adjacent battery row (22) at least one side of the separator (30); in the height direction of the battery, the separator (30) is divided into a first dividing segment (31) and a second dividing segment (32), the first dividing segment (31) is located above the second dividing segment (32), and the projection of the first dividing segment (31) on the side of the sub-battery (21) covers the corresponding position of the fixed part (213); At least one baffle (230) is disposed between the first dividing section (31) and the sub-battery (21). The top of the baffle (230) is provided with an extension (231) extending toward the upper cover plate (212), and the extension (231) is fixedly connected to the upper cover plate (212). A cavity (232) is formed between the baffle (230) and the lower housing (211), and the fixed connection part (213) is located in the cavity (232).

2. The battery pack according to claim 1, characterized in that, A gap c, in mm, is provided between the baffle (230) and the sub-battery (21), where c satisfies 0.3mm≤c≤1mm.

3. The battery pack according to claim 1, characterized in that, The thickness of the baffle (230) is e, in mm, and e satisfies 0.5mm≤e≤1.2mm.

4. The battery pack according to claim 1, characterized in that, In the height direction of the battery, the top surface height of the baffle (230) is higher than the top surface height of the separator (30).

5. The battery pack according to claim 1, characterized in that, The baffle (230) is an insulating plate.

6. The battery pack according to claim 1, characterized in that, The baffle (230) is an L-shaped plate.

7. The battery pack according to claim 1, characterized in that, Multiple baffles (230) are provided, and one baffle (230) is provided on each side of each sub-battery (21).

8. The battery pack according to any one of claims 1 to 7, characterized in that, At least one of the separators (30) is located between adjacent battery rows (22), and both sides of the separator (30) are fixedly connected to the sides of the sub-batteries (21) of the adjacent battery rows (22).

9. The battery pack according to any one of claims 1 to 7, characterized in that, In the height direction of the sub-battery (21), the distance between the bottom end of the first dividing segment (31) and the fixed part (213) is h, in mm, and h satisfies 10 mm ≤ h ≤ 30 mm.

10. The battery pack according to any one of claims 1 to 7, characterized in that, In the height direction of the sub-battery (21), the extension length of the baffle (230) is less than the extension length of the first dividing segment (31).

11. The battery pack according to any one of claims 1 to 7, characterized in that, In the height direction of the battery, the first dividing segment (31) accounts for 8% to 20% of the height of the separator (30).

12. The battery pack according to any one of claims 1 to 7, characterized in that, The thickness of the partition (30) is d, in mm, and d satisfies 1mm≤d≤3mm.

13. The battery pack according to any one of claims 1 to 7, characterized in that, The lower housing (211) and the upper cover plate (212) are welded together, and the fixed connection (213) is the weld formed by welding the lower housing (211) and the upper cover plate (212).

14. The battery pack according to any one of claims 1 to 7, characterized in that, In the height direction of the sub-battery (21), the top of the separator (30) is flush with the top surface of the upper cover plate (212), and the distance between the top of the separator (30) and the fixed part (213) is 1-2 mm.

15. The battery pack according to any one of claims 1 to 7, characterized in that, In the height direction of the sub-battery (21), the top of the separator (30) is flush with the fixed part (213).

16. The battery pack according to any one of claims 1 to 7, characterized in that, The separator (30) is bonded and fixed to the side of the sub-battery (21) by an adhesive layer (40).

17. The battery pack according to claim 16, characterized in that, The adhesive layer (40) includes a first adhesive portion (41) and a second adhesive portion (42); The first dividing segment (31) is bonded to the side of the baffle (230) by the first adhesive part (41), and the second dividing segment (32) is bonded to the side of the sub-battery (21) by the second adhesive part (42).

18. The battery pack according to claim 17, characterized in that, The thickness of the first adhesive portion (41) is less than the thickness of the second adhesive portion (42).

19. The battery pack according to claim 16, characterized in that, The bonding strength of the adhesive layer (40) is t, in MPa, and t satisfies 2MPa≤t≤10MPa.

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

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