A battery pack and an electric device

Abstract

The application relates to the technical field of battery equipment, in particular to a battery pack and a power consumption equipment, which comprises a battery cell module, a shell, a first insulating piece, a second insulating piece and an insulating layer. The shell has a first space, and the battery cell module is arranged in the first space. The first insulating piece is arranged in the first space and is used for wrapping the battery cell module in a negative pressure state. The second insulating piece has a second space, and the first insulating piece is accommodated in the second space. The insulating layer is formed by injecting an insulating material between the second insulating piece and the first insulating piece and solidifying, and the first insulating piece and the second insulating piece are connected through the insulating layer. The battery pack has high waterproof performance, and the single components are convenient to maintain and replace.

Description

Technical Field

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

[0002] To increase battery capacity or voltage to meet the power demands of electrical devices, multiple battery cells are typically connected in parallel or series to form a battery module, which is then secured by a casing. However, the casing's waterproofing is often poor; contact with water can cause a short circuit, rendering the entire battery pack malfunction and causing significant inconvenience. Furthermore, the battery module is usually glued to the casing, making disassembly difficult and prone to damaging the cells or casing, hindering repair and replacement. Summary of the Invention

[0003] The purpose of this invention is to provide a battery pack and electrical device that improves the waterproof performance of the battery pack and facilitates maintenance and replacement. The specific technical solution is as follows:

[0004] This application provides a battery pack in a first aspect, comprising: a cell module; a housing having a first space, the cell module being disposed within the first space; a first insulating member disposed within the first space, the first insulating member being used to enclose the cell module under negative pressure; a second insulating member having a second space, the first insulating member being housed within the second space; and an insulating layer formed by injecting insulating material between the second insulating member and the first insulating member and curing it, the first insulating member and the second insulating member being connected through the insulating layer.

[0005] In this embodiment, the first insulating component encloses the cell module under negative pressure, effectively forming an insulating and waterproof layer on the surface of the cell module. This waterproof layer isolates the cell module from the outside environment, limiting direct contact between the external humid environment and even external moisture with the cell module surface, reducing the entry of moisture into the cell module and improving the waterproof performance of the battery pack. Insulating material is injected between the first and second insulating components, and after curing, an insulating layer is formed. The insulating material is in fluid form, and the second insulating component is a flexible material, allowing the insulating material to fully fill the gap between the second and first insulating components. Relying on the weight of the insulating material, the second insulating component fits as closely as possible to the inner surface of the casing. The insulating layer formed after curing not only connects the first and second insulating components but also integrates the casing, the second insulating component, the first insulating component, and the cell module into a single unit, thus securing the cell module. Furthermore, the insulating layer provides protection, such as moisture resistance, fire resistance, and anti-static properties. By placing the insulating layer between the second and first insulating components, the casing and the insulating layer do not directly contact each other. The casing only adheres to the second insulating component, without any adhesive fixing connection, which reduces the difficulty of disassembling the casing. Simultaneously, the insulating layer does not directly contact the cell module, allowing for destructive removal of the first, second, and insulating components and the insulating layer, improving disassembly efficiency without damaging the cell module or casing. Placing the insulating layer between the second and first insulating components facilitates the repair and replacement of critical individual components in the battery pack, such as the casing or cell module, allowing for individual repair and replacement. Protecting the casing and cell module during disassembly significantly reduces the operating cost of the battery pack.

[0006] According to some embodiments of this application, the second insulating member includes a body portion for forming the second space, and the opening of the body portion is provided with at least two extension portions disposed away from the body portion, and the extension portions have a first gap with the body portion.

[0007] In this embodiment, the second space formed by the main body is used to accommodate the first insulating member and the battery cell module located inside the first insulating member. The main body has an opening through which the first insulating member is inserted into the second insulating member and housed within the main body. Two extensions located away from the main body can be configured as hooks, serving as handles for the second insulating member, facilitating the housing of the first insulating member within the main body. A first gap exists between the extensions and the main body, which facilitates the injection of insulating material and reduces the risk of interference with other components.

[0008] According to some embodiments of this application, the first insulating member includes a first opening, the battery cell module includes a connecting portion, the connecting portion extends out of the first insulating member through the first opening, and the connecting portion is sealed to the first insulating member by a sealant.

[0009] In this embodiment, the connecting portion extends beyond the first insulating member through the first opening, facilitating electrical connection between the inside and outside of the battery cell module. The connecting portion and the first opening are sealed with sealant, improving the sealing performance of the battery cell module.

[0010] According to some embodiments of this application, the battery cell module further includes a circuit board, the circuit board and the battery cell module are disposed along a first direction, and the battery pack further includes a bracket for covering the surface of the circuit board away from the battery cell module.

[0011] In this embodiment, the circuit board is used for electrical connection with the electrode terminals of the battery cell module. A bracket is provided on the surface of the circuit board away from the battery cell module. By covering the solder joints and other structures on the surface of the circuit board with the bracket, direct contact between the circuit board and the first insulating component can be reduced, thereby reducing the risk of the solder joints and other components on the surface of the circuit board puncturing the first insulating component.

[0012] According to some embodiments of this application, the bracket includes a bottom wall and four side walls connected to the bottom wall, the bottom wall and the four side walls forming a receiving space, the circuit board is disposed in the receiving space, and the side wall has a second opening for the connection portion to pass through at a position opposite to the first opening.

[0013] In this embodiment, the bottom wall and four side walls of the bracket form a certain receiving space. The circuit board is received within the receiving space, which reduces the risk of displacement of the bracket relative to the circuit board, ensuring that the two always remain in a mating state, further reducing the risk of the circuit board puncturing the first insulating member. A second opening is provided on the side wall at a position opposite to the first opening. The opposing arrangement of the first and second openings shortens the distance the connection part travels from the battery module to the outside of the first insulating member, allowing the connection part to extend to the outside of the first insulating member with the shortest possible length.

[0014] According to some embodiments of this application, the side of the bottom wall facing the circuit board further includes a first protrusion spaced apart from the bottom wall along a second direction, the first protrusion being connected to the circuit board; along the first direction, the height of the first protrusion is lower than the height of the side wall.

[0015] In this embodiment, the second direction is perpendicular to the stacking surface of the battery cell. A certain accommodating space is formed between the first protrusion and the bottom wall, which can be used to accommodate the second conductive sheet on the circuit board. Along the first direction, the height of the first protrusion is lower than the height of the side wall, so that the accommodating space formed by the first protrusion and the bottom wall has a certain height, and the second conductive sheet will not directly contact the bottom wall of the support, which can reduce the impact on the conductivity of the circuit board.

[0016] According to some embodiments of this application, the bracket extends out of the battery cell module along the second direction.

[0017] In this embodiment, the bracket extends out of the battery cell module. When vacuuming, the first insulating element is tightly attached to the surface of the bracket, so that there is a certain gap between the first insulating element and the battery cell module, which reduces the compression of the battery cell module and thus protects the battery cell module.

[0018] According to some embodiments of this application, when viewed in the opposite direction to the second direction, the first insulating member and the second insulating member are provided with a second gap along the first direction.

[0019] In this embodiment, the insulating material enters the second gap through the second side gap, filling the second gap between the first and second insulating components, thereby improving the sealing performance between the first and second insulating components. After curing, the insulating material forms an insulating layer, which serves to connect the first and second insulating components.

[0020] According to some embodiments of this application, the battery cell includes an electrode assembly, a battery cell housing, and electrode terminals connected to the electrode assembly and extending from the battery cell housing. The electrode terminals are connected to the circuit board, and the battery cell housing includes an aluminum-plastic film.

[0021] In this embodiment, the electrode assembly includes a wound structure formed by winding or stacking a positive electrode sheet, a negative electrode sheet, and a separator. The cell housing includes a first portion for accommodating the electrode assembly and a second portion extending outward from the first portion, with electrode terminals extending beyond the cell housing from the second portion. The electrode terminals extending beyond the cell housing facilitate electrical connection with other components. Specifically, the cell housing includes an aluminum-plastic film, which has the advantages of low density and light weight, reducing the overall weight of the battery pack. The cell includes a pouch cell.

[0022] According to some embodiments of this application, the materials of the first insulating member and the second insulating member include waterproof resin.

[0023] In this embodiment, the waterproof resin includes polyethylene (PE). Polyethylene is a thermoplastic resin obtained by polymerizing ethylene and has good waterproof properties. Furthermore, the first and second insulating components made of PE resin have high flexibility, allowing the first insulating component to better encapsulate the battery module during vacuuming, and enabling the second insulating component to adhere as closely as possible to the shell surface under the action of the insulating material. This allows the shell, the second insulating component, and the first insulating component to form a unified whole under the action of the insulating layer.

[0024] According to some embodiments of this application, the housing includes a first main body portion and a cover plate disposed along the second direction, the first main body portion and the cover plate being connected to form the first space; the cover plate is used to press the battery cell module; the cover plate is provided with at least one first potting hole and a third opening opposite to the position of the first opening, the third opening being used for the connecting portion to pass through.

[0025] In this embodiment, the first main body is used to accommodate the second insulating member, and the cover plate is used to press the battery cell module along the second direction, i.e., the stacking direction of the battery cells, to reduce the expansion of the battery cell module along the second direction. The first potting hole on the cover plate allows the insulating material to be injected after the second insulating member is housed in the housing, which facilitates the formation of the housing, the second insulating member, and the first insulating member into a whole, and can limit the amount of insulating material injected. The third opening is arranged opposite to the first opening, which can shorten the distance required for the connecting part to pass through the first insulating member, the second insulating member, and the housing, saving material.

[0026] According to some embodiments of this application, the housing includes a second main body and a third main body that are detachably connected along a third direction. The second main body has a first subspace, and the third main body has a second subspace. The second main body and the third main body are connected so that the first subspace and the second subspace form the first space. The end faces of the second main body and the third main body along the second direction are each provided with a second potting hole and a fourth opening opposite to the position of the first opening. The fourth opening is used for the connecting part to pass through.

[0027] In this embodiment, the third direction is perpendicular to the first and second directions. The housing consists of a second main body and a third main body, which can be joined together along the third direction to place the second insulating member inside the housing, reducing the difficulty of installing the second insulating member. The end faces of the second and third main bodies along the second direction can be understood as having at least one second potting hole on the end face where they are joined together. The second potting hole is used to inject insulating material. The fourth opening is arranged opposite to the first opening, which can shorten the distance required for the connecting part to pass through the first insulating member, the second insulating member, and the housing, saving material.

[0028] A second aspect of this application provides an electrical device, which includes the battery pack described above.

[0029] In this embodiment, because a first insulating component and a second insulating component are added between the battery pack casing and the cell module, and an insulating layer is disposed between the first and second insulating components, the insulating layer does not directly contact the casing. This facilitates the separation of the casing from the second insulating component during battery pack disassembly, allowing for casing replacement, or the destructive removal of the second insulating component, insulating layer, and first insulating component to replace the BMS components. Since the casing and cell module are protected during disassembly, the operating cost of the battery pack is significantly reduced. Furthermore, wrapping the cell module with the first insulating component improves the battery pack's waterproof performance.

[0030] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0032] Figure 1 An exploded structural diagram of a battery pack provided in one embodiment of this application;

[0033] Figure 2 for Figure 1 Left side view of the assembled battery pack;

[0034] Figure 3 for Figure 2 A magnified structural diagram of part A in the middle;

[0035] Figure 4 A schematic diagram of a structure in which the first insulating element is placed inside the second insulating element;

[0036] Figure 4 (a) is a schematic diagram of the structure of the second insulating component;

[0037] Figure 5 for Figure 4 Top view;

[0038] Figure 6 This is a schematic diagram showing the structure of the circuit board and the battery cell module.

[0039] Figure 7 A front view of the battery cell module placed inside the first insulating component;

[0040] Figure 8 for Figure 7 Perspective view after being rotated 180 degrees;

[0041] Figure 9 for Figure 8 A magnified structural diagram of part B in the middle section;

[0042] Figure 10 This is a schematic diagram of the assembled battery cell module and circuit board.

[0043] Figure 11 This is a schematic diagram of the support structure;

[0044] Figure 12 This is a schematic diagram of the battery cell structure;

[0045] Figure 13 This is a schematic diagram of the cover plate structure;

[0046] Figure 14 An exploded structural diagram of the battery pack provided in another embodiment of this application;

[0047] Figure 15 for Figure 14 A schematic diagram of the assembled battery pack;

[0048] Figure 16 This is a schematic diagram of the handle's structure.

[0049] The attached figures are labeled as follows:

[0050] Battery cell module 100; Battery cell 101; Battery cell housing 101a; Electrode terminal 101b; Connecting part 102; Wire harness 1020; Fixing part 1021; Circuit board 103; Second conductive sheet 103a; Second buffer layer 104; First conductive sheet 105; Housing 200; First space 201; First subspace 201a; Second subspace 201b; First main body 202; Cover plate 203; First potting hole 203a; Third opening 203b; Second main body 204; Snap-fit ​​part 204a; Third main body 205; Fitting part 205a; Fourth opening 206; Second potting hole 207; First insulating component 300; First Opening 301; Second insulating member 400; Body part 401; Opening 401a; Second edge 401b; Extension 402; First edge 402a; First gap 403; First side gap 403a; Second side gap 403b; Second gap 404; First buffer layer 405; Insulating layer 500; Support 600; Bottom wall 601; First protrusion 601a; Second protrusion 601b; Height H of the first protrusion; Side wall 602; Second opening 602a; Receiving space 603; Positioning post 604; Handle 700; Aircraft insert 701; Fifth opening 702; Reinforcing plate 800; First direction X; Second direction Y; Third direction Z. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of the present invention.

[0052] The first aspect of this application provides a battery pack, such as Figure 1 As shown, the battery pack includes: a cell module 100, a housing 200, a first insulating member 300, a second insulating member 400, and an insulating layer 500. The housing 200 has a first space 201, within which the cell module 100 is placed. The first insulating member 300 is placed within the first space 201 and is used to enclose the cell module 100 under negative pressure. The second insulating member 400 has a second space, within which the first insulating member 300 is housed. The insulating layer 500 is formed by injecting insulating material between the second insulating member 400 and the first insulating member 300 and then curing it; the first insulating member 300 and the second insulating member 400 are connected through the insulating layer 500.

[0053] In this embodiment, the first insulating component 300 wraps the cell module 100 under negative pressure, which is equivalent to forming an insulating and waterproof layer on the surface of the cell module 100. This waterproof layer can isolate the cell module 100 from the outside world, restrict the external humid environment and even external moisture from directly contacting the surface of the cell module 100, reduce the entry of water vapor into the cell module 100, and improve the waterproof performance of the battery pack.

[0054] like Figure 2 , Figure 3As shown, insulating material is injected between the first insulating component 300 and the second insulating component 400, and the insulating material is cured to form an insulating layer 500. The insulating material is in fluid form, which allows it to fully fill the gap between the second insulating component 400 and the first insulating component 300. Relying on the weight of the insulating material, the second insulating component 400 is made to fit as closely as possible to the inner surface of the housing 200. After the insulating layer 500 is cured, it not only connects the first insulating component 300 and the second insulating component 400, but also makes the housing 200, the second insulating component 400, the first insulating component 300 and the battery cell module 100 a whole, thereby fixing the battery cell module 100. Moreover, the insulating layer 500 also provides protection, such as moisture protection, fire protection, and anti-static properties. By placing the insulating layer 500 between the second insulating member 400 and the first insulating member 300, the housing 200 and the insulating layer 500 do not directly contact each other. The housing 200 only adheres to the second insulating member 400, without any adhesive fixing connection, thus reducing the difficulty of disassembling the housing 200. Simultaneously, the insulating layer 500 does not directly contact the cell module 100, allowing for destructive removal of the first insulating member 300, the second insulating member 400, and the insulating layer 500, improving disassembly efficiency without damaging the cell module 100 during the process. Placing the insulating layer 500 between the second insulating member 400 and the first insulating member 300 facilitates the repair and replacement of important individual components in the battery pack; for example, the housing 200 and the cell module 100 can be repaired and replaced individually. This protects the housing 200 and the cell module 100 during disassembly, reducing the operating cost of the battery pack.

[0055] Understandably, the second insulating element 400 can be made of a flexible material, so that the second insulating element 400 can fit as closely as possible to the inner surface of the housing 200 under the weight of the insulating material itself.

[0056] In some embodiments, such as Figure 4 , Figure 5 As shown, the second insulating member 400 includes a body portion 401 for forming a second space. At least two extension portions 402 are provided at the opening of the body portion 401, extending away from the body portion 401. A first gap 403 exists between the extension portions 402 and the body portion 401. The first gap 403 includes a first side gap 403a and a second side gap 403b.

[0057] In this embodiment, the second space formed by the body portion 401 is used to accommodate the first insulating member 300 and the battery cell module 100 located inside the first insulating member 300, such as... Figure 4As shown in (a), the body portion 401 has an opening 401a through which the first insulating member 300 is inserted into the second insulating member 400 and housed within the body portion 401. Two extension portions 402 are disposed away from the body portion 401. The first edge 402a of the extension portion 402 is recessed inward relative to the second edge 401b of the body portion 401 to form a clearance space. This clearance space is... Figure 5 The first gap 403 is located within the first insulating part 401. Specifically, the extension 402 can be configured as a hook, serving as a handle for the second insulating member 400, facilitating the storage of the first insulating member 300 within the main body 401. Figure 4 , Figure 5 As shown, the first side gap 403a is used to reduce the risk of interference between the extension 402 and other components. Optionally, the second side gap 403b is used for injecting insulating material. Optionally, the first side gap 403a is used for injecting insulating material.

[0058] In some embodiments, such as Figure 1 , Figures 6 to 9 As shown, the first insulating member 300 includes a first opening 301, and the battery module 100 includes a connection part 102 for inputting or outputting electrical energy or transmitting signals. The connection part 102 extends out of the first insulating member 300 through the first opening 301, and the connection part 102 and the first insulating member 300 are sealed with sealant, such as waterproof double-sided tape.

[0059] In some embodiments, such as Figure 9 , Figure 10 As shown, the connecting part 102 includes a wire harness 1020 and a fixing part 1021. The fixing part 1021 fixes the wire harness 1020. One end of the wire harness 1020 is soldered to the circuit board 103. Sealant can be added at the soldering position to further seal the battery module 100. The other end of the wire harness 1020 extends out of the first insulating member 300 through the first opening 301.

[0060] In this embodiment, as Figures 6 to 8 As shown, the first opening 301 is located above the cell module 100. The connecting part 102 extends out of the first insulating member 300 through the first opening 301, facilitating electrical connection between the inside and outside of the cell module 100. The connecting part 102 and the first insulating member 300 are sealed with sealant to improve the sealing performance at the first opening 301, thereby enhancing the sealing performance of the cell module 100. The connecting part 102 can be a wire harness or a connector. The main function of the connecting part 102 is to input or output electrical energy or transmit signals.

[0061] In some embodiments, the first opening 301, in addition to allowing the connecting portion 102 to pass through, can also be used to evacuate the first insulating member 300, so that the first insulating member 300 wraps the battery cell module 100 under negative pressure. When evacuating the first insulating member 300 through the first opening 301, since the battery cell module 100, circuit board 103, bracket 600 and other components are all completely inside the first insulating member 300, the first insulating member 300 can wrap them after evacuation.

[0062] In some embodiments, such as Figure 4 , Figure 5 As shown, the first side gap 403a can reduce the risk of interference between the extension 402 and the connecting part 102, and facilitate the passage of the connecting part 102.

[0063] like Figure 1 , Figure 10 , Figure 11 As shown, the battery cell module 100 also includes a circuit board 103. The circuit board 103 and the battery cell module 100 are arranged along a first direction X. The battery pack also includes a bracket 600, which is used to cover the surface of the circuit board 103 facing away from the battery cell module 100. By covering the solder joints and other structures on the surface of the circuit board 103 with the bracket 600, direct contact between the circuit board 103 and the first insulating member 300 can be reduced, thereby reducing the risk of the solder joints and other structures on the surface of the circuit board 103 puncturing the first insulating member 300.

[0064] In this embodiment, the battery cell module 100 includes a plurality of stacked battery cells 101, and the second direction Y is the stacking direction of the battery cells 101. The circuit board 103 may be disposed on the side of the battery cell module 100 having electrode terminals 101b.

[0065] In some embodiments, the circuit board 103 includes a BMS (Battery Management System) component. The BMS component includes multiple electronic components that can perform functions such as data acquisition, control, protection, communication, power calculation, signal transmission, and power transmission for each cell 101 in the cell module 100.

[0066] Optionally, the circuit board 103 includes a printed circuit board (PCB) with multiple conductors (not shown). Optionally, the circuit board 103 includes a flexible printed circuit board (FPC).

[0067] Specifically, such as Figure 11As shown, the bracket 600 includes a bottom wall 601 and four side walls 602 connected to the bottom wall 601. The bottom wall 601 and the four side walls 602 form a receiving space 603. The circuit board 103 is disposed in the receiving space 603. The side wall 602 is provided with a second opening 602a for the connecting part 102 to pass through at a position opposite to the first opening 301.

[0068] In some embodiments, the bottom wall 601 and four side walls 602 of the bracket 600 form a certain receiving space 603, in which the circuit board 103 is received. This reduces the risk of displacement of the bracket 600 relative to the circuit board 103, helps the bracket 600 and the circuit board 103 maintain a cooperative state, and further reduces the risk of the circuit board 103 puncturing the first insulating member 300. The side wall 602 has a second opening 602a at a position opposite to the first opening 301. The first opening 301 and the second opening 602a are arranged opposite each other, which can shorten the distance that the connecting part 102 is led out from the cell module 100 to the outside of the first insulating member 300, so that the connecting part 102 is led out to the outside of the first insulating member 300 with the shortest possible length.

[0069] In some embodiments, such as Figure 11 As shown, the side of the bottom wall 601 facing the circuit board 103 also includes a first protrusion 601a spaced apart from the bottom wall 601 along the second direction Y. The first protrusion 601a is connected to the circuit board 103. Along the first direction X, the height H of the first protrusion is lower than the height of the side wall 602.

[0070] In this embodiment, the second direction Y is perpendicular to the first direction X. A certain receiving space is formed between the first protrusion 601a and the bottom wall 601, which can be used to receive the second conductive sheet 103a on the circuit board 103. Figure 1 As shown, the battery cell module includes multiple first conductive sheets 105 corresponding one-to-one with the second conductive sheet 103a. The first conductive sheets 105 are electrically connected to the second conductive sheets 103a. The first conductive sheets 105 are used to electrically connect to the electrode terminals 101b of a single battery cell 101, so that the circuit board 103 can collect information such as voltage and current of the battery cell 101 through the second conductive sheets 103a and the first conductive sheets 105. Figure 11 As shown, along the first direction X, the height H of the first protrusion is lower than the height of the side wall 602, so that the accommodating space formed by the first protrusion 601a and the bottom wall 601 has a certain height, and the second conductive sheet 103a will not directly contact the bottom wall 601 of the bracket 600, which can reduce the impact on the conductivity of the circuit board 103.

[0071] like Figure 11As shown, the side of the bottom wall 601 facing the circuit board 103 also includes second protrusions 601b spaced apart along the first direction X. The first protrusions 601a and the second protrusions 601b form a series of receiving grooves, which correspond to the second conductive pieces 103a on the circuit board 103, so that each second conductive piece 103a is located in a separate receiving groove, reducing the risk of short circuits between them.

[0072] Furthermore, such as Figure 11 As shown, the bracket 600 is also provided with a plurality of positioning posts 604, each positioning post 604 being used to cooperate with the positioning groove on the circuit board 103 to improve assembly accuracy.

[0073] In addition, the provision of the first protrusion 601a and the second protrusion 601b can increase the strength of the bracket 600 and improve its service life.

[0074] In some embodiments, such as Figures 6 to 8 As shown, along the second direction Y, the bracket 600 extends out of the cell module 100.

[0075] In this embodiment, the bracket 600 extends out of the cell module 100. When vacuuming, the first insulating member 300 is in close contact with the surface of the bracket 600, so that there is a certain gap between the first insulating member 300 and the cell module 100, reducing the compression on the cell module 100, thereby protecting the cell module 100.

[0076] In some embodiments, such as Figure 1 , Figure 4 , Figure 5 As shown, when viewed in a direction opposite to the second direction Y, the first insulating member 300 and the second insulating member 400 are provided with a second gap 404 along the first direction X.

[0077] In this embodiment, the insulating material enters the second gap 404 through the second side gap 403b, filling the second gap 404 between the first insulating member 300 and the second insulating member 400, thereby improving the sealing performance between the first insulating member 300 and the second insulating member 400. After the insulating material cures, it forms an insulating layer 500, which serves to connect the first insulating member 300 and the second insulating member 400.

[0078] like Figure 4 , Figure 5 As shown, the second gap 404 below can be exposed through the first gap 403, thus facilitating the injection of insulating material into the second gap 404 through the first gap 403 and the second gap 404. Optionally, along the first direction X, the size of the first gap 403 is larger than the size of the second gap 404.

[0079] In some embodiments, such as Figures 6 to 8 As shown, the battery pack also includes a first buffer layer 405. The cell module 100 includes a plurality of cells 101 arranged along the second direction Y. Along the second direction Y, the first buffer layer 405 is disposed between the first insulating member 300 and the second insulating member 400.

[0080] In this embodiment, the first buffer layer 405 can be cushioning foam, and the first buffer layer 405 and the first insulating member 300 can be bonded together using adhesive or glue. The first buffer layer 405 is used to press excess first insulating member 300 between the first buffer layer 405 and the first insulating member 300. When insulating material is injected between the first insulating member 300 and the second insulating member 400 to form a cured layer, the first buffer layer 405 can also play a buffering role, reducing the degree of compression of the insulating layer 500 on the cell module 100, thereby protecting the cell module 100.

[0081] In some embodiments, such as Figure 10 As shown, the battery cell module 100 includes a plurality of battery cells 101 stacked along the second direction Y. Figure 12 As shown, the battery cell 101 includes an electrode assembly, a battery cell housing 101a, and an electrode terminal 101b connected to the electrode assembly and extending from the battery cell housing 101a. The electrode terminal 101b is connected to a circuit board 103. The battery cell housing 101a includes an aluminum-plastic film.

[0082] Understandably, the electrode assembly includes a structure formed by winding or stacking positive electrode sheets, negative electrode sheets, and a separator. The cell housing 101a includes a first portion for accommodating the electrode assembly and a second portion extending outward from the first portion, with electrode terminals 101b extending beyond the cell housing 101a from the second portion. The electrode terminals 101b extend beyond the cell housing 101a to facilitate electrical connection with other components. Specifically, the cell housing 101a includes an aluminum-plastic film, which has the advantages of low density and light weight, reducing the overall weight of the battery pack. The cell 101 includes a pouch cell. Of course, the cell housing 101a can also be a steel housing.

[0083] In some embodiments, such as Figure 10 As shown, a second buffer layer 104 is provided between the circuit board 103 and the battery cell module 100. The second buffer layer 104 has a cutout portion, which is located above the first conductive sheet 105 of the battery cell module 100. The orthographic projection of the cutout portion on the battery cell module 100 is basically the same as the shape of the first conductive sheet 105, so as to facilitate the electrical connection between the first conductive sheet 105 and the second conductive sheet 103a.

[0084] In this embodiment, the second buffer layer 104 can be a support foam to support the circuit board 103, while reducing dimensional errors and allowing the circuit board 103 to fit with the battery module 100, thereby reducing the stress on the welding position when the first conductive sheet 105 is welded to the second conductive sheet 103a of the circuit board 103.

[0085] In the above embodiments, the materials of the first insulating member 300 and the second insulating member 400 include waterproof resin.

[0086] In this embodiment, the waterproof resin includes polyethylene (PE). Polyethylene is a thermoplastic resin obtained by polymerizing ethylene and has good waterproof properties. By wrapping the first insulating component 300 with PE resin, the waterproof performance of the battery pack can be improved. Furthermore, the first insulating component 300 and the second insulating component 400, both made of PE resin, have high flexibility, allowing the first insulating component 300 to better wrap the cell module 100 during vacuuming, and allowing the second insulating component 400 to better adhere to the surface of the housing 200 under the action of the insulating material. Thus, the housing 200, the second insulating component 400, and the first insulating component 300 can form a whole under the action of the insulating layer 500.

[0087] In some embodiments, such as Figure 1 , Figure 13 As shown, the housing 200 includes a first main body 202 and a cover plate 203 arranged along the second direction Y. The first main body 202 and the cover plate 203 are connected to form a first space 201. The cover plate 203 is used to press the battery cell module 100. The cover plate 203 is provided with at least one first potting hole 203a and a third opening 203b opposite to the position of the first opening 301. The first potting hole 203a is used to inject insulating material between the second insulating member 400 and the first insulating member 300, and the third opening 203b is used for the connecting part 102 to pass through.

[0088] In this embodiment, the first main body 202 is used to accommodate the second insulating member 400, and the cover plate 203 is used to press the cell module 100 along the second direction Y, i.e., the stacking direction of the cells 101, to reduce the expansion of the cell module 100 along the second direction Y. The first potting hole 203a on the cover plate 203 allows the insulating material to be injected after the second insulating member 400 is housed in the housing 200, which facilitates the formation of the housing 200, the second insulating member 400, and the first insulating member 300 into a whole, and can limit the amount of insulating material injected. The third opening 203b is arranged opposite to the first opening 301, which can shorten the distance required for the connecting part 102 to pass through the first insulating member 300, the second insulating member 400, and the housing 200, saving materials.

[0089] In other embodiments, such as Figure 14As shown, Figure 14 The illustrated embodiments and Figure 1 The only difference in the illustrated embodiment is the structure of the housing 200; all other parts are the same. The housing 200 includes a second main body 204 and a third main body 205 detachably connected along a third direction Z. The second main body 204 has a first subspace 201a, and the third main body 205 has a second subspace 201b, which corresponds to the first subspace 201a. The second main body 204 and the third main body 205 are connected so that the first subspace 201a and the second subspace 201b form a first space 201. Both the second main body 204 and the third main body 205 have a second potting hole 207 and a fourth opening 206 opposite to the first opening 301 on their end faces along a second direction Y. Adhesive is injected through the second potting hole 207 to allow insulating material to be injected between the second insulating member 400 and the first insulating member 300. The fourth opening 206 allows the connecting part 102 to pass through.

[0090] In this embodiment, the third direction Z is perpendicular to the first direction X and the second direction Y. The housing 200 consists of a second main body 204 and a third main body 205, which can be joined together along the third direction Z to place the second insulating member 400 inside the housing 200. This allows for flexible selection by the user, facilitating the choice of a suitable housing structure according to needs. The end faces of the second main body 204 and the third main body 205 along the second direction Y can be understood as having at least one second potting hole 207 on the end face where they are joined together. The second potting hole 207 is used to inject insulating material. The fourth opening 206 is arranged opposite to the first opening 301, which can shorten the distance required for the connecting part 102 to pass through the first insulating member 300, the second insulating member 400, and the housing 200, thus saving material.

[0091] Optionally, the second main body portion 204 and the third main body portion 205 can be snap-fitted. In either the second main body portion 204 or the third main body portion 205, one has a snap-fit ​​portion 204a, and the other has a mating portion 205a. The snap-fit ​​portion 204a mates with the mating portion 205a to snap the second main body portion 204 and the third main body portion 205 together. Figure 14 , Figure 15 As shown, the snap-fit ​​part 204a can be a snap ring, and the mating part 205a can be a protrusion. To improve the sealing performance of the housing 200, sealant can be applied to the snap-fit ​​position after snap-fit.

[0092] In some embodiments, such as Figure 1 , Figure 14 , Figure 16 As shown, the battery pack also includes a handle 700 and a reinforcing plate 800, which are respectively disposed on both sides of the housing 200 along the second direction Y.

[0093] In this embodiment, the handle 700 facilitates the movement of the battery pack. Specifically, the handle 700 is a one-piece plastic handle 700, and a fifth opening 702 for inserting the connecting part 102 is provided on the handle 700 at a position opposite to the first opening 301. The connecting part 102 and the fifth opening 702 are sealed with sealant. Figure 1 , Figure 14 As shown, the connecting part 102 here is the connector, specifically, the connector is the aviation plug 701. The handle 700 and the housing 200 are detachably connected by screws. The screw holes can be provided on the housing 200, and the side wall 602 of the housing 200 facing the handle 700 is provided with a groove. A sealing element can be provided in the groove to enhance the sealing between the handle 700 and the housing 200.

[0094] like Figure 1 In the illustrated embodiment, after the handle 700 is connected to the first main body 202, the handle 700 applies pressure to the cover plate 203, thereby causing the cover plate 203 to press against the battery cell module 100. The cover plate 203 and the first main body 202 may not be directly connected. Figure 14 In the embodiment shown, one side of the handle 700 is connected to the second main body 204, and the other side of the handle 700 is connected to the third main body 205.

[0095] A reinforcing plate 800 is disposed opposite to the handle 700 to increase the strength of the bottom of the housing 200 and reduce the risk of damage to the housing 200 caused by the battery pack during movement. Figure 1 The reinforcing plate 800 is not shown in the illustrated embodiment, which is understandable. Figure 1 The embodiments described may also include a reinforcing plate 800.

[0096] A second aspect of this application provides an electrical device, which includes the battery pack described above, and the battery pack is used to provide electrical energy to the electrical device.

[0097] In this embodiment, because a first insulating member 300 and a second insulating member 400 are added between the battery pack housing 200 and the cell module 100, and an insulating layer 500 is disposed between the first insulating member 300 and the second insulating member 400, the insulating layer 500 does not directly contact the housing 200. This facilitates the separation of the housing 200 and the second insulating member 400 during battery pack disassembly, allowing for replacement of the housing 200, or the destructive removal of the second insulating member 400, the insulating layer 500, and the first insulating member 300 to replace the BMS components. Since the housing 200 and the cell module 100 are protected during disassembly, the operating cost of the battery pack is greatly reduced. Furthermore, by encasing the cell module 100 with the first insulating member 300, the waterproof performance of the battery pack is improved.

[0098] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0099] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0100] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A battery pack characterized by comprising: The battery pack comprises: a battery cell module; a housing having a first space in which the battery cell module is disposed; a first insulation member disposed in the first space, the first insulation member being configured to wrap the battery cell module in a negative pressure state; a second insulation member having a second space in which the first insulation member is received; an insulation layer formed by injecting and solidifying an insulation material between the second insulation member and the first insulation member; the second insulation member comprises a body portion configured to form the second space, and at least two extension portions disposed away from the body portion and provided at an opening of the body portion, the extension portions having a first gap with the body portion therebetween; the first insulation member and the second insulation member are provided with a second gap in a first direction, and the insulation layer is formed by injecting and solidifying the insulation material through the first gap and the second gap.

2. The battery pack of claim 1, wherein, the first insulation member comprises a first opening, the battery cell module comprises a connecting portion extending out of the first insulation member through the first opening, and the connecting portion and the first insulation member are sealed by a sealant.

3. The battery pack of claim 2, wherein, the battery cell module further comprises a circuit board disposed in the first direction with the battery cell module, and the battery pack further comprises a support configured to cover a surface of the circuit board facing away from the battery cell module.

4. The battery pack of claim 3, wherein, the support comprises a bottom wall and four side walls connected to the bottom wall, the bottom wall and the four side walls form a receiving space in which the circuit board is disposed, and the side wall opposite to the first opening is provided with a second opening for the connecting portion to pass through.

5. The battery pack of claim 4, wherein, the bottom wall further comprises a first protrusion spaced apart from the bottom wall in the second direction, the first protrusion is connected to the circuit board; in the first direction, the height of the first protrusion is lower than the height of the side wall.

6. The battery pack of claim 5, wherein, in the second direction, the support extends out of the battery cell module.

7. The battery pack of claim 3, wherein, the battery cell comprises an electrode assembly, a battery cell housing, and an electrode terminal connected to the electrode assembly and led out of the battery cell housing, the electrode terminal is connected to the circuit board, and the battery cell housing comprises an aluminum plastic film.

8. The battery pack according to any one of claims 1 to 7, characterized by, the materials of the first insulation member and the second insulation member comprise waterproof resin.

9. The battery pack according to any one of claims 2 to 7, wherein the housing comprises a first main body portion and a cover plate disposed in the second direction, the first main body portion is connected to the cover plate to form the first space, and the cover plate is configured to press the battery cell module; the cover plate is provided with at least one first glue injection hole and a third opening opposite to the position of the first opening, and the third opening is used for the connecting portion to pass through.

10. The battery pack according to claims 2-7, characterized by the housing comprises a second main body portion and a third main body portion detachably connected in a third direction, the second main body portion has a first sub-space, the third main body portion has a second sub-space, and the second main body portion and the third main body portion are connected to form the first space with the first sub-space and the second sub-space. The end surface of the second main body part and the third main body part along the second direction is provided with a second glue pouring hole and a fourth opening opposite to the first opening position, and the fourth opening is used for the connecting part to pass out.

11. An electrical device, characterized by The electric device comprises the battery pack of any one of claims 1-10.

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