Battery pack and electric device

Abstract

The application provides a battery pack and an electric device, and relates to the technical field of batteries. The battery pack comprises a first end and a second end opposite to each other along a first direction, a battery management unit electrically connected to the first end of the battery cell assembly, an insulating shell attached to the outer surfaces of the battery cell assembly and the battery management unit and used for sealing the battery cell assembly and the battery management unit, a first support connected to the insulating shell and located on the side of the battery management unit away from the battery cell assembly, a second support connected to the second end of the battery cell assembly, and a connecting assembly having one end connected to the first support and the other end connected to the second support. The battery pack provided by the application has a small overall volume and can reduce the space occupation.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery pack and electrical device. Background Technology

[0002] A battery pack typically includes a cell assembly, a battery control unit, and a casing. During the battery pack packaging process, the cell assembly and the battery control unit are usually placed together in a larger casing to achieve a sealed encapsulation of both components.

[0003] However, the battery packs in the aforementioned related technologies are relatively large, resulting in a large space occupation. Utility Model Content

[0004] This application provides a battery pack and an electrical device to solve the technical problem in the above-mentioned related technologies that the battery pack is large in size, resulting in a large space occupation of the battery pack.

[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0006] A first aspect of this application provides a battery pack, including:

[0007] A battery cell assembly, the battery cell assembly including a first end and a second end opposite to each other along a first direction;

[0008] The battery management unit is electrically connected to the first end of the battery cell assembly;

[0009] An insulating outer shell is attached to the outer surface of the cell assembly and the battery management unit, and is used to seal the cell assembly and the battery management unit;

[0010] The first bracket is connected to the insulating shell and is located on the side of the battery management unit facing away from the cell assembly;

[0011] The second bracket is connected to the second end of the battery cell assembly;

[0012] The connecting component is connected at one end to the first bracket and at the other end to the second bracket.

[0013] This application provides a battery pack that, compared to existing technologies, eliminates the traditional integral metal casing of the battery pack. Instead, it encapsulates the cell assembly and battery management unit using only a first bracket, a second bracket, and an insulating shell. The insulating shell directly covers the functional components, ensuring a tight fit against their surfaces and reducing redundant space. Therefore, this application significantly reduces the overall size of the battery pack while maintaining electrical safety.

[0014] Furthermore, the first and second brackets clamp the insulating shell, the battery cell assembly, and the battery control unit between them, and fix the first and second brackets through the connecting components. This can improve the connection stability between the first and second brackets, thereby improving the clamping stability of the insulating shell, the battery control unit, and the battery cell assembly, and also improving the structural stability of the battery pack.

[0015] In one possible implementation, the insulating shell has a first partition inside, which is used to divide the interior of the insulating shell into a first cavity and a second cavity;

[0016] The first cavity is used to install the battery cell assembly, and the second cavity is used to seal and install the battery management unit.

[0017] In one possible implementation, the insulating housing further includes:

[0018] An electrical connector, wherein the first separator has a first through hole, one end of the electrical connector is electrically connected to the cell assembly, and the other end passes through the first through hole and is electrically connected to the battery management unit;

[0019] A first sealing element is used to seal the gap between the first through hole and the electrical connector.

[0020] In one possible implementation, the insulating shell is injection molded and attached to the outer periphery of the cell assembly and the battery management unit.

[0021] In one possible implementation, the cell assembly includes:

[0022] Multiple battery cells, wherein the multiple battery cells are arranged at intervals along a second direction;

[0023] Multiple connecting tabs, with each pair of adjacent cells electrically connected through one of the connecting tabs;

[0024] The first cavity has a plurality of second partitions arranged at intervals along the second direction. The second partitions are used to divide the first cavity into a plurality of chambers, and each chamber is used to install one of the battery cells.

[0025] In one possible implementation, the battery cell includes:

[0026] ontology;

[0027] A cover plate is disposed on the side of the body facing the first bracket and is electrically connected to the negative electrode of the body;

[0028] The electrode post is insulated from the cover plate and electrically connected to the positive electrode of the body.

[0029] One end of the connecting piece is connected to the terminal of one of the battery cells, and the other end is connected to the cover plate of the adjacent battery cell.

[0030] In one possible implementation, the first bracket has a second through hole along the first direction;

[0031] The battery management unit includes:

[0032] A circuit board is disposed at a distance from the battery cell assembly and within the second cavity;

[0033] The plug-in structure has one end located on the side of the circuit board facing away from the battery cell assembly, and the other end passing through the insulating shell and the second through hole in sequence along the first direction;

[0034] The second sealing element is disposed at the mating point between the plug structure and the second through hole.

[0035] In one possible implementation, a pressure relief valve is provided on the side of the battery cell assembly facing the second end;

[0036] The second bracket has a first channel extending in a second direction inside;

[0037] The second bracket has an air inlet corresponding to the pressure relief valve, and the air inlet is connected to the first channel;

[0038] The second bracket has an exhaust port that communicates with the first channel.

[0039] In one possible implementation, a high-temperature resistant structure is provided inside the first channel, the high-temperature resistant structure has a second channel extending along the second direction, the second channel is connected to the exhaust port, and the high-temperature resistant structure has an opening that connects the air inlet and the second channel.

[0040] In one possible implementation, the second bracket has a mounting groove at one end facing the cell assembly, and the cell assembly is disposed within the mounting groove.

[0041] In one possible implementation, the connecting assembly includes a connecting rod and a plurality of connectors, one end of the connecting rod being connected to the first bracket via the connectors, and the other end of the connecting rod being connected to the second bracket via another connector.

[0042] A second aspect of this application provides an electrical device that includes a battery pack as described above. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application;

[0045] Figure 2 An exploded view of a battery pack provided in an embodiment of this application;

[0046] Figure 3 for Figure 1 Cross-sectional view of the battery pack at MM;

[0047] Figure 4 This is a schematic diagram of the structure of an insulating shell provided in an embodiment of this application;

[0048] Figure 5 This is a schematic diagram of the structure of a second support provided in an embodiment of this application;

[0049] Figure 6 for Figure 5 Exploded view of the second support structure;

[0050] Figure 7 for Figure 5 Cross-sectional view of the second support at point AA;

[0051] Figure 8 for Figure 5 The cross-sectional view of the second support at BB.

[0052] Explanation of reference numerals in the attached figures:

[0053] 100. Battery cell assembly;

[0054] 110, First terminal; 120, Second terminal; 130, Battery cell; 140, Connecting piece;

[0055] 131. Body; 132. Cover plate; 133. Pole post;

[0056] 200. Battery Management Unit;

[0057] 210. Circuit board; 220. Insertion structure; 230. Second seal;

[0058] 300. Insulating outer casing;

[0059] 310. First partition; 320. First cavity; 330. Second cavity;

[0060] 340. Electrical connector; 350. Second separator;

[0061] 400. First support;

[0062] 410. Second through hole;

[0063] 500, Second support;

[0064] 510, First channel; 520, Air inlet; 530, Exhaust outlet; 540, Mounting slot;

[0065] 600. Connecting components;

[0066] 610. Connecting rod; 620. Connecting component;

[0067] 700. High-temperature resistant structure;

[0068] 710. Second channel; 720. Opening;

[0069] 800, structural adhesive. Detailed Implementation

[0070] As described in the background section, the battery packs in the aforementioned related technologies are relatively large, resulting in a large space occupation.

[0071] The reason for this problem is that existing battery packs generally adopt a monolithic sealed structure, completely encapsulating the cell assembly, battery management unit, and other components within a single housing. To facilitate the installation of the cell assembly and battery management unit within the housing, there are installation tolerances between the inner wall of the housing and the cell assembly and battery management unit, resulting in a large battery pack volume. This type of structure leads to an excessively large sealed volume and a wide sealing surface coverage, making it prone to overall failure due to localized seal failure during long-term use. It also increases the space occupied by the battery pack. For example, when the sealant ages or the sealing ring deforms, external contaminants can easily penetrate the housing, causing short circuits or corrosion of electrical components.

[0072] To address the aforementioned issues, this application provides a battery pack and electrical device. Compared to existing technologies, this solution eliminates the traditional integral metal casing of the battery pack, using only a first bracket, a second bracket, and an insulating shell to encapsulate the cell assembly and battery management unit. The insulating shell directly covers the functional components, tightly fitting their surfaces and reducing redundant space. Therefore, this application significantly reduces the overall size of the battery pack while ensuring electrical safety.

[0073] Furthermore, the first and second brackets clamp the insulating shell, the battery cell assembly, and the battery control unit between them, and fix the first and second brackets through the connecting components. This can improve the connection stability between the first and second brackets, thereby improving the clamping stability of the insulating shell, the battery control unit, and the battery cell assembly, and also improving the structural stability of the battery pack.

[0074] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0075] refer to Figure 1 , Figure 2 and Figure 3 This application provides a battery pack, which may include a cell assembly 100, a battery management unit 200, an insulating shell 300, a first bracket 400, a second bracket 500, and a connecting assembly 600.

[0076] The cell assembly 100 may include components along a first direction (e.g., Figure 2 The first end 110 and the second end 120 are opposite each other in the Y direction. The cell assembly 100 can refer to an energy storage unit containing positive and negative terminals, and can be implemented by arranging cylindrical or square cells 130 along the axial direction, with electrical connection end and mechanical fixing end formed at its two ends, respectively.

[0077] The battery management unit 200 is electrically connected to the first end 110 of the cell assembly 100. The battery management unit 200 may refer to a circuit module that monitors and controls the operation of the cell 130, and may specifically include a printed circuit board and a plug-in structure 220, which is connected to the cell assembly 100 through wires or conductive sheets.

[0078] An insulating shell 300 is attached to the outer surface of the cell assembly 100 and the battery management unit 200, and is used to seal the cell assembly 100 and the battery management unit 200. The insulating shell 300 refers to a sealing structure formed of non-conductive material, specifically molded around the cell 130 and circuit assembly using a low-pressure injection molding process, achieving electrical isolation and physical protection. The insulating shell 300 can achieve individual sealing of the cell assembly 100 and the battery management unit 200.

[0079] The first bracket 400 is connected to the insulating shell 300 and is located on the side of the battery management unit 200 facing away from the cell assembly 100. The first bracket 400 can refer to a load-bearing structure located outside the insulating shell 300 along the first direction, and can specifically be an injection-molded plastic bracket or a metal stamping part.

[0080] The second bracket 500 connects to the second end 120 of the cell assembly 100. The second bracket 500 refers to the support structure disposed at the second end 120 of the cell assembly 100, specifically designed as a metal frame with positioning grooves to constrain the displacement of the cell assembly 100. The first bracket 400 and the second bracket 500 can jointly clamp the cell assembly 100, the insulating shell 300, and the battery control unit in a first direction. The second bracket 500 can be connected to the second end 120 of the cell assembly 100 via structural adhesive 800.

[0081] One end of the connecting component 600 is connected to the first bracket 400, and the other end is connected to the second bracket 500. The connecting component 600 can refer to a rigid connecting member that connects the first bracket 400 and the second bracket 500. Specifically, it can adopt a threaded connecting rod 610 or an elastic snap-fit ​​structure, and enhance the structural stability through a multi-point distribution method.

[0082] In its specific implementation, the battery cell assembly 100 is arranged along a first direction, and the battery management unit 200 is arranged at the first end 110 of the battery cell assembly 100 and electrically connected through conductive sheets. The insulating shell 300 forms a continuous sealing layer around the battery cell assembly 100 and the battery management unit 200 using a low-pressure injection molding process, eliminating the assembly gap between the conventional shell and internal components. The first bracket 400 and the second bracket 500 clamp the insulating shell 300, the battery control unit, and the battery cell assembly 100 from their respective ends. The connecting assembly 600 connects the first bracket 400 and the second bracket 500 into a single unit using mechanical fastening.

[0083] In some embodiments, the first bracket 400 may have injection holes. After the battery control unit and the cell assembly 100 are assembled with the second bracket 500, the first bracket 400 is snapped onto the first end 110 of the battery control unit and the cell assembly 100. Then, the surface and gaps of the battery control unit and the cell assembly 100 are injection molded through the injection holes on the first bracket 400. The first bracket 400 can provide a positioning reference for the molding of the insulating shell 300, avoiding the accumulation of tolerances caused by traditional shell assembly.

[0084] This application provides a battery pack that, compared to existing technologies, eliminates the traditional integral metal casing of the battery pack. Instead, it uses only a first bracket 400, a second bracket 500, and an insulating shell 300 to encapsulate the cell assembly 100 and the battery management unit 200. The insulating shell 300 directly covers the functional components, ensuring a tight fit to their surfaces and reducing redundant space. Therefore, this application significantly reduces the overall size of the battery pack while maintaining electrical safety.

[0085] Furthermore, the first bracket 400 and the second bracket 500 clamp the insulating shell 300, the cell assembly 100 and the battery control unit between them, and fix the first bracket 400 and the second bracket 500 through the connecting assembly 600. This can improve the connection stability between the first bracket 400 and the second bracket 500, thereby improving the clamping stability of the insulating shell 300, the battery control unit and the cell assembly 100, and improving the structural stability of the battery pack.

[0086] Reference Figure 1 and Figure 2 In some embodiments, the connecting assembly 600 may include a connecting rod 610 and a plurality of connectors 620, one end of the connecting rod 610 being connected to the first bracket 400 via a connector 620, and the other end of the connecting rod 610 being connected to the second bracket 500 via another connector 620.

[0087] In some embodiments, there may be multiple connecting rods 610, which are arranged at intervals around the outer periphery of the first bracket 400 and the second bracket 500 to improve the connection stability of the first bracket 400 and the second bracket 500.

[0088] The connecting rod 610 can be a rigid rod with a preset length, which can be made of metal or high-strength composite material. Its two ends are connected to the first bracket 400 and the second bracket 500 respectively by connectors 620 to form a detachable or fixed connection.

[0089] The connector 620 can refer to the element used to fix the connecting rod 610 to the bracket. Specifically, it can be a bolt, snap or welded structure. Multiple connectors 620 are distributed at intervals along the outer periphery of the first bracket 400 and the second bracket 500 to distribute the force.

[0090] In practice, the two ends of the connecting rod 610 are fixed to the front and rear supports respectively through the connectors 620 to form a cross-type support structure. Multiple connectors 620 are distributed along the outer edge of the support to form a ring constraint. When external vibration or impact loads are applied to the battery pack, the connecting rod 610 will uniformly transfer the stress to the entire support through multi-point fixing, avoiding connection failure caused by local stress concentration.

[0091] Through the above technical solution, the combined structure of the connecting rod 610 and multiple connecting parts 620 enhances the connection rigidity between the front and rear brackets, effectively suppresses the risk of fatigue detachment between the bracket and the cell assembly 100, and improves the structural stability of the battery pack under complex working conditions.

[0092] Reference Figure 2 , Figure 3 and Figure 4 In some embodiments, the insulating housing 300 has a first partition 310 inside, which divides the interior of the insulating housing 300 into a first cavity 320 and a second cavity 330. The first cavity 320 is used to install the battery cell assembly 100, and the second cavity 330 is used to seal and install the battery management unit 200.

[0093] The first partition 310 refers to a structural component installed inside the insulating shell 300. Specifically, it can be implemented by injection molding or by independently installed partition, which is used to form a physically isolated independent sealed space inside the insulating shell 300.

[0094] The first cavity 320 refers to the space formed by the first separator 310 and the inner wall of the insulating shell 300, which is used to accommodate and enclose the battery cell assembly 100, for example, by low-pressure injection molding or glue filling to achieve sealing.

[0095] The second cavity 330 refers to another sealed space formed by the first partition 310 and the inner wall of the insulating shell 300, which is used to accommodate and enclose the battery management unit 200, for example, by fixing and sealing the circuit board 210 and the connecting wires through an injection molding process.

[0096] Specifically, the first separator 310 extends longitudinally or laterally along the insulating outer shell 300, dividing the interior of the shell into two independent cavities. The battery cell assembly 100 is disposed in the first cavity 320, and the battery management unit 200 is completely enclosed in the second cavity 330. The two cavities are physically isolated from each other by the first separator 310.

[0097] If the insulating shell 300 is an injection molding mechanism, then the first cavity 320, the second cavity 330, and the first partition can be formed through the injection molding process.

[0098] This design uses a first separator 310 to divide the sealed areas into independent zones, making the sealed areas of the cell assembly 100 and the battery management unit 200 independent of each other. When the seal of one cavity fails, the other cavity can still maintain a sealed state, preventing moisture or debris from simultaneously entering all critical components.

[0099] Through the above technical solution, this application achieves physical isolation and independent sealing between the battery cell assembly 100 and the battery management unit 200, significantly reducing the impact of sealing failure on the overall battery pack. Heat or gas generated by the two components within their respective cavities can be directionally discharged through their respective cavity structures, avoiding mutual interference. Simultaneously, the independent sealing design allows for individual handling of components within a single cavity during maintenance without damaging the overall sealing structure, improving maintenance convenience.

[0100] Reference Figure 2 , Figure 3 and Figure 4 In some embodiments, the insulating housing 300 may further include an electrical connector 340 and a first seal. The electrical connector 340 has a first through hole on the first separator 310. One end of the electrical connector 340 is electrically connected to the cell assembly 100, and the other end passes through the first through hole and is electrically connected to the battery management unit 200. The first seal is used to seal the gap between the first through hole and the electrical connector 340.

[0101] The first through hole can refer to an opening provided on the first partition 310, which can be formed by stamping or injection molding and is used for the power supply connector 340 to pass through.

[0102] Electrical connector 340 can refer to a conductive component that enables electrical connection between the cell assembly 100 and the battery management unit 200. Specifically, it can be implemented using copper busbars or metal wires and fixed by welding or plugging.

[0103] The first seal can refer to the sealing material that fills the gap between the first through hole and the electrical connector 340. Specifically, it can be made of silicone or rubber material and formed into a sealing structure through injection molding or pressing processes.

[0104] Specifically, the battery cell assembly 100 is installed within the first cavity 320, and the battery management unit 200 is sealed and installed within the second cavity 330. The electrical connector 340 extends from the battery cell assembly 100, passes through the first through-hole of the first separator 310, and reaches the second cavity 330, where it is electrically connected to the battery management unit 200. In the contact area between the first through-hole and the electrical connector 340, a first seal is used to eliminate gaps, thereby preventing material exchange between the first cavity 320 and the second cavity 330. Thus, while maintaining electrical connection, the battery cell assembly 100 and the battery management unit 200 are each in an independent sealed environment, preventing the failure of the seal in one cavity from affecting the other.

[0105] This solution achieves physical isolation through the first separator 310 and, through the combined design of the electrical connector 340 and the first seal, achieves compartment sealing while ensuring electrical connection. This application effectively isolates the working environment of the cell assembly 100 and the battery management unit 200, preventing overall seal failure due to unilateral seal failure. Simultaneously, the compartment sealing design reduces the overall sealing volume of the insulating shell 300, simplifies the sealing structure, and reduces safety hazards caused by seal aging.

[0106] Reference Figure 2 , Figure 3 and Figure 4 In some embodiments, the insulating housing 300 is injection molded and attached to the outer periphery of the cell assembly 100 and the battery management unit 200.

[0107] The injection molding of the insulating shell 300 can refer to the process of directly molding the insulating material onto the outer surface of the cell assembly 100 and the battery management unit 200 through injection molding. For example, it can be achieved by low-pressure injection molding, which allows the insulating material to fill the gaps between the components and form a gapless sealing layer.

[0108] The outer periphery can refer to the space surrounding the cell assembly 100 and the battery management unit 200, where a continuous covering layer is formed through injection molding.

[0109] It is understood that the first separator 310 can refer to an isolation structure formed simultaneously during the injection molding process. For example, a partition perpendicular to the injection direction can be formed inside the insulating shell 300 through mold design, dividing the space into two independent areas. The first cavity 320 and the second cavity 330 correspond to the installation spaces of the cell assembly 100 and the battery management unit 200, respectively. For example, the first cavity 320 can cover at least part of the outer surface of the cylindrical body of the cell assembly 100, and the second cavity 330 can cover the flat circuit board 210 area of ​​the battery management unit 200.

[0110] This solution eliminates the structural redundancy of independent housings by directly molding the encapsulation layer through injection molding. It achieves partitioned sealing between the cell assembly 100 and the battery management unit 200, and the injection molding method of the insulating shell 300 directly conforms to the shape of the components, reducing the space redundancy of traditional shells.

[0111] Reference Figure 2 , Figure 3 and Figure 4 In some embodiments, the battery cell assembly 100 may include a plurality of battery cells 130 and a plurality of connecting pieces 140.

[0112] Multiple cells 130 along the second direction (e.g.) Figure 2The cells 130 are arranged at intervals in the X direction. Each pair of adjacent cells 130 in the plurality of connecting pieces 140 is electrically connected through a connecting piece 140. The first cavity 320 has a plurality of second partitions 350 arranged at intervals in the second direction. The second partitions 350 are used to divide the first cavity 320 into a plurality of chambers, each chamber for installing a cell 130.

[0113] The second direction can refer to the horizontal arrangement direction perpendicular to the first direction, usually referring to the width direction of the cell 130, and can be implemented using the Y-axis direction of the coordinate axis.

[0114] The connecting piece 140 can be an conductive metal piece used to connect the electrodes of adjacent cells 130 in series or in parallel. Specifically, it can be achieved by connecting the positive and negative electrodes of the cells 130 by welding nickel or copper pieces.

[0115] The second partition 350 can refer to an injection-molded insulating partition used to divide the first cavity 320 into independent chambers. Specifically, it can be made of polypropylene or polycarbonate material and integrally molded with the insulating shell 300 through an injection molding process.

[0116] The chamber can refer to the space that each cell 130 can independently accommodate, which is used to isolate the physical contact and short circuit risk between the cells 130. Specifically, it can be formed simultaneously with the second separator 350 through the injection molding process.

[0117] Compared to arranging multiple cells 130 directly in the same cavity, forming independent chambers through the second separator 350 allows each cell 130 to be in an independent sealed environment. Even if a single cell 130 fails, the heat or leaked material it generates will be confined to the corresponding chamber, avoiding a chain reaction.

[0118] Through the above technical solution, this application achieves physical isolation and independent sealing between the battery cells 130, effectively preventing short circuits caused by contact or electrolyte penetration between adjacent battery cells 130. The second separator 350, acting as an insulating barrier, further blocks the heat transfer path during thermal runaway, improving the overall safety and reliability of the battery pack. Simultaneously, the independent chamber design facilitates the individual replacement of faulty battery cells 130 during maintenance, reducing maintenance costs.

[0119] Reference Figure 2 , Figure 3 and Figure 4In some embodiments, the battery cell 130 may include a body 131, a cover plate 132, and a terminal 133. The cover plate 132 is disposed on the side of the body 131 facing the first support 400 and is electrically connected to the negative electrode of the body 131. The terminal 133 is insulated from the cover plate 132 and is electrically connected to the positive electrode of the body 131. One end of the connecting piece 140 is connected to the terminal 133 of one of the battery cells 130, and the other end is connected to the cover plate 132 of the adjacent battery cell 130.

[0120] The body 131 can refer to the main body of the battery cell 130, which can be implemented in a cylindrical or square structure to accommodate the active material and electrolyte inside the battery cell 130.

[0121] The cover plate 132 can refer to a metal plate covering one end of the body 131. Specifically, it can be connected to the body 131 by welding or riveting to realize negative electrical connection and provide mechanical support.

[0122] The electrode post 133 can refer to a conductive structure that is electrically connected to the positive electrode. Specifically, it can be implemented using a copper post or an aluminum post. It is isolated from the cover plate 132 by an insulating material and is used to draw out the positive electrode current.

[0123] The connecting piece 140 can refer to a conductive component used to connect the battery cells 130 in series or in parallel. Specifically, it can be made of nickel sheet or copper-aluminum composite sheet and connected to the pole post 133 and the adjacent cover plate 132 by laser welding or bolt fixing.

[0124] In practical implementation, multiple battery cells 130 are arranged at intervals along the second direction. The cover plate 132 of each battery cell 130 is connected to the negative terminal of the body 131, and the terminal 133 is isolated from the cover plate 132 by an insulating structure and is connected to the positive terminal of the body 131. Connecting pieces 140 connect the terminals 133 of two adjacent battery cells 130 to the cover plate 132, forming a series-parallel circuit. Since all connecting pieces 140 are located at the same end of the battery cell 130 facing the first support 400, the gap between the connecting piece 140 and the battery cell 130 is sealed by the insulating shell 300, preventing the connecting piece 140 from being exposed to the external environment. The connecting piece 140 does not need to bridge to the other end of the battery cell 130, thereby reducing space occupation.

[0125] This design centralizes electrical connections at one end, eliminating the space occupied by the connecting piece 140 at the other end and making the overall battery pack structure more compact. The connecting pieces 140 are centrally located at one end and uniformly sealed by the insulating shell 300, avoiding the risk of short circuits due to seal failure at multiple locations, thus improving the battery pack's safety and space utilization.

[0126] Reference Figure 2 , Figure 3 and Figure 4In some embodiments, the first bracket 400 has a second through hole 410 along a first direction. The battery management unit 200 may include a circuit board 210, a plug-in structure 220, and a second seal 230. The circuit board 210 is spaced apart from the cell assembly 100 and disposed within the second cavity 330. One end of the plug-in structure 220 is disposed on the side of the circuit board 210 facing away from the cell assembly 100, and the other end passes sequentially through the insulating shell 300 and the second through hole 410 along the first direction. The second seal 230 is disposed at the mating point between the plug-in structure 220 and the second through hole 410.

[0127] The circuit board 210 can refer to an electronic component used to control and manage the battery cell assembly 100. Specifically, it can be implemented using a printed circuit board, on which electronic components and connecting lines are arranged to realize battery management functions.

[0128] The plug-in structure 220 can refer to an interface component used to connect external devices or power supplies. Specifically, it can be implemented using metal pins or sockets, which pass through the insulating shell 300 and the second through hole 410 to achieve conduction with the external circuit.

[0129] The second through hole 410 can refer to a through hole provided on the first bracket 400, which can be formed by machining or injection molding process, and is used to guide the passage path of the plug-in structure 220.

[0130] The second seal 230 can refer to a sealing material used to seal the gap between the plug structure 220 and the second through hole 410. Specifically, it can be a rubber ring or a silicone gasket to prevent external moisture or impurities from seeping into the second cavity 330 through the gap.

[0131] In its implementation, the circuit board 210 is independently encapsulated within the second cavity 330, maintaining a distance from the cell assembly 100 to avoid electromagnetic interference. One end of the plug-in structure 220 is fixed to the side of the circuit board 210 facing away from the cell assembly 100, and the other end passes through the insulating shell 300 and extends to the outside of the second through hole 410 of the first bracket 400, forming an external interface. The second seal 230 wraps around the contact area between the plug-in structure 220 and the second through hole 410, filling the gap between them through elastic deformation, thereby achieving a sealed protection. This structure completely isolates the electrical interface of the battery management unit 200 from the cell assembly 100 in space, and the passage path of the plug-in structure 220 is strictly limited within the channel formed by the insulating shell 300 and the second through hole 410, effectively preventing external contaminants from entering the battery pack.

[0132] By isolating the circuit board 210 with an independent cavity and transferring the sealing responsibility of the plug-in structure 220 to the mating point between the second through hole 410 and the plug-in structure 220, the sealing area of ​​the battery management unit 200 is reduced to a local point, thereby reducing the risk of short circuit caused by the failure of the overall sealing surface and extending the service life of the battery pack.

[0133] Reference Figure 2 , Figure 5 and Figure 6 In some embodiments, a pressure relief valve is provided on the side of the cell assembly 100 facing the second end 120. A first channel 510 extending in a second direction is provided inside the second bracket 500, and an air inlet 520 corresponding to the pressure relief valve is provided in the second bracket 500. The air inlet 520 communicates with the first channel 510, and an exhaust port 530 communicating with the first channel 510 is provided on the second bracket 500.

[0134] The pressure relief valve can refer to a pressure release device installed at the end of the battery cell assembly 100. Specifically, it can be implemented using a mechanical rupture disc or spring valve structure, and is used to automatically open and release gas when the internal pressure of the battery cell 130 exceeds a threshold.

[0135] The first channel 510 can refer to a gas guiding path extending inside the second support 500. Specifically, it can be implemented using an injection-molded hollow tubular structure to guide the high-temperature gas discharged from the pressure relief valve in a specified direction.

[0136] The air inlet 520 can refer to the through hole corresponding to the position of the pressure relief valve. Specifically, it can be formed by machining the hole 720 in the mold to ensure that the gas enters the first channel 510 directly from the pressure relief valve.

[0137] The exhaust port 530 can refer to the air outlet located on the outer surface of the second bracket 500. Specifically, it can be implemented using a one-way valve or a mesh structure to safely discharge gas to the external environment.

[0138] In practical implementation, when the internal pressure of the battery cell 130 rises due to abnormal heating, the pressure relief valve opens under pressure, and high-temperature gas enters the first channel 510 through the air inlet 520. The first channel 510 extends along the second direction, guiding the gas to flow away from the battery cell assembly 100, and finally discharges directionally through the exhaust port 530. Since the second bracket 500 integrates a gas guiding structure, there is no need to set up an additional independent exhaust pipe, reducing assembly complexity. For example, the cross-sectional shape of the first channel 510 can be designed as semi-circular or rectangular, and its inner wall is coated with a high-temperature resistant coating to avoid corrosion by high-temperature gas.

[0139] By integrating the pressure relief valve and the directional exhaust channel into the second bracket 500, the path of gas from generation to discharge is completely independent, preventing high-temperature gas from contacting other electrical components.

[0140] In some embodiments, the second bracket 500 can be formed by injection molding, and the first channel 510 can be integrally formed during the injection molding process of the first bracket 400, which reduces the number of parts and improves sealing reliability.

[0141] Through the above technical solution, this application effectively solves the risk of battery pack rupture caused by disordered gas emission during thermal runaway of cell 130. Gas is rapidly discharged through a pre-defined path, reducing the possibility of internal pressure buildup. The directional exhaust design prevents high-temperature gas from flowing back into the cell 130 area, preventing a chain reaction. The integrated channel structure reduces the overall volume occupied by the battery pack while ensuring functionality.

[0142] Reference Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In some embodiments, a high-temperature resistant structure 700 is provided inside the first channel 510. The high-temperature resistant structure 700 has a second channel 710 extending along the second direction. The second channel 710 is connected to the exhaust port 530, and the high-temperature resistant structure 700 is provided with an opening 720 that connects the air inlet 520 and the second channel 710.

[0143] Among them, the high-temperature resistant structure 700 can refer to materials or components that can withstand the impact of high-temperature gases. Specifically, it can be made of metal alloys or high-temperature resistant ceramic materials to prevent the first channel 510 from being deformed or melted and blocked during the depressurization process.

[0144] The second channel 710 can refer to an independent gas guiding path set inside the high-temperature resistant structure 700. Specifically, it can be implemented using a tubular structure or channel forming process to maintain the stability of the gas flow path.

[0145] The opening 720 can refer to a through-hole provided on the side wall or end of the high-temperature resistant structure 700. Specifically, it can be formed by drilling or casting processes and is used to guide the airflow introduced by the air inlet 520 to the second channel 710.

[0146] In practical implementation, when the battery cell assembly 100 experiences thermal runaway, the high-temperature gas released by the pressure relief valve enters the first channel 510 through the air inlet 520. The high-temperature gas first contacts the high-temperature resistant structure 700. Because this structure is made of a high-temperature resistant material, deformation or molten material accumulation due to softening of the inner wall of the channel at high temperatures can be avoided. The gas then enters the second channel 710 through the opening 720, flows in the second direction inside the high-temperature resistant structure 700, and finally exits from the exhaust port 530. The independent design of the second channel 710 separates the gas flow path from the physical structure of the first channel 510, ensuring that the second channel 710 remains unobstructed even if the first channel 510 deforms due to heat.

[0147] By adding an independent high-temperature resistant structure 700 inside the channel, direct contact between high-temperature gas and the main material of the channel is effectively isolated. This ensures the structural integrity of the exhaust channel during the depressurization process of cell 130, reduces the risk of airflow blockage caused by channel deformation or molten material accumulation, and ensures that high-temperature gas is stably discharged along a predetermined path, thus avoiding safety hazards caused by abnormal pressure increases inside the battery pack.

[0148] Reference Figure 2 , Figure 5 and Figure 6 In some embodiments, the second bracket 500 has a mounting groove 540 at one end facing the cell assembly 100, and the cell assembly 100 is disposed in the mounting groove 540.

[0149] The mounting groove 540 can refer to a recessed structure located at the end of the second bracket 500. It can be formed by machining or injection molding. The groove wall fits the outer contour of the battery cell assembly 100, preventing displacement of the battery cell assembly 100 on the second bracket 500 through lateral limiting. Specifically, when the battery cell assembly 100 is embedded in the mounting groove 540 of the second bracket 500, the contact between the groove wall and the side of the battery cell assembly 100 creates a three-dimensional constraint, effectively suppressing the movement of the battery cell assembly 100 in the lateral and longitudinal directions.

[0150] Through the above technical solution, this application achieves precise positioning and fixation of the battery cell assembly 100 on the second bracket 500, prevents relative displacement caused by mechanical vibration, and improves the connection stability between the battery cell assembly 100 and the second bracket 500.

[0151] This application also provides an electrical device that may include the battery pack described above. By using the battery pack described in this application, the space occupied by the battery pack is significantly reduced, thereby reducing the space occupied by the battery pack on the electrical device and improving the space utilization rate of the electrical device.

[0152] In some embodiments, the electrical equipment can be a vehicle or an energy storage device. The vehicle can be a new energy vehicle, such as a pure electric vehicle (PEV / BEV), a range-extended electric vehicle (REEV), a hybrid electric vehicle (HEV), or a fuel cell electric vehicle. The vehicle can also be any vehicle with a battery.

[0153] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0154] It should be noted that phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplarily" in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0155] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0156] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0157] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, include: A battery cell assembly (100) includes a first end (110) and a second end (120) opposite each other along a first direction; A battery management unit (200) is electrically connected to the first end (110) of the battery cell assembly (100); An insulating housing (300) is attached to the outer surface of the cell assembly (100) and the battery management unit (200) and is used to seal the cell assembly (100) and the battery management unit (200); The first bracket (400) is connected to the insulating shell (300) and is located on the side of the battery management unit (200) facing away from the cell assembly (100); The second bracket (500) is connected to the second end (120) of the cell assembly (100); The connecting component (600) is connected at one end to the first bracket (400) and at the other end to the second bracket (500).

2. The battery pack according to claim 1, characterized in that, The insulating shell (300) has a first partition (310) inside, which is used to divide the interior of the insulating shell (300) into a first cavity (320) and a second cavity (330); The first cavity (320) is used to install the battery cell assembly (100), and the second cavity (330) is used to seal and install the battery management unit (200).

3. The battery pack according to claim 2, characterized in that, The insulating housing (300) also includes: An electrical connector (340) has a first through hole on the first separator (310). One end of the electrical connector (340) is electrically connected to the cell assembly (100), and the other end passes through the first through hole and is electrically connected to the battery management unit (200). A first seal is used to seal the gap between the first through hole and the electrical connector (340).

4. The battery pack according to claim 2, characterized in that, The insulating shell (300) is injection molded and attached to the outer periphery of the cell assembly (100) and the battery management unit (200).

5. The battery pack according to claim 2, characterized in that, The battery cell assembly (100) includes: Multiple battery cells (130) are arranged at intervals along a second direction; Multiple connecting pieces (140), each pair of adjacent cells (130) are electrically connected through one of the connecting pieces (140); The first cavity (320) has a plurality of second partitions (350) arranged at intervals along the second direction. The second partitions (350) are used to divide the first cavity (320) into a plurality of chambers, each of which is used to install one of the battery cells (130).

6. The battery pack according to claim 5, characterized in that, The battery cell (130) includes: Ontology(131); A cover plate (132) is disposed on the side of the body (131) facing the first bracket (400) and electrically connected to the negative electrode of the body (131); The pole (133) is insulated from the cover plate (132) and electrically connected to the positive electrode of the body (131); One end of the connecting piece (140) is connected to the terminal (133) of one of the battery cells (130), and the other end is connected to the cover plate (132) of the adjacent battery cell (130).

7. The battery pack according to claim 2, characterized in that, The first bracket (400) has a second through hole (410) along the first direction; The battery management unit (200) includes: A circuit board (210) is disposed at a distance from the battery cell assembly (100) and is disposed within the second cavity (330); The plug-in structure (220) has one end located on the side of the circuit board (210) facing away from the battery cell assembly (100), and the other end passes through the insulating shell (300) and the second through hole (410) in sequence along the first direction; The second seal (230) is disposed at the mating point between the plug structure (220) and the second through hole (410).

8. The battery pack according to any one of claims 1-7, characterized in that, A pressure relief valve is provided on the side of the battery cell assembly (100) facing the second end (120); The second bracket (500) has a first channel (510) extending in a second direction inside; The second bracket (500) has an air inlet (520) corresponding to the pressure relief valve, and the air inlet (520) is connected to the first channel (510); The second bracket (500) has an exhaust port (530) communicating with the first channel (510).

9. The battery pack according to claim 8, characterized in that, The first channel (510) is provided with a high temperature resistant structure (700), the high temperature resistant structure (700) has a second channel (710) extending along the second direction, the second channel (710) is connected to the exhaust port (530), and the high temperature resistant structure (700) is provided with an opening (720) connecting the air inlet (520) and the second channel (710).

10. The battery pack according to any one of claims 1-7, characterized in that, The second bracket (500) has a mounting groove (540) at one end facing the cell assembly (100), and the cell assembly (100) is disposed in the mounting groove (540).

11. The battery pack according to any one of claims 1-7, characterized in that, The connecting assembly (600) includes a connecting rod (610) and a plurality of connectors (620). One end of the connecting rod (610) is connected to the first bracket (400) through the connector (620), and the other end of the connecting rod (610) is connected to the second bracket (500) through another connector (620).

12. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-11.

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