Battery pack and electric device

Abstract

The application provides a battery pack and an electric device. The battery pack comprises a box body, at least one battery module and structural glue. The box body has a receiving cavity. The at least one battery module and the structural glue are arranged in the receiving cavity. Each battery module comprises a plurality of battery cells. The extending direction of each battery cell intersects with the height direction of the box body. At least one of the end faces of the two battery cells opposite to each other along the extending direction is provided with a first explosion-proof valve. The structural glue is arranged between the battery cells and the box body and is spaced apart from the first explosion-proof valve. The battery pack is used to improve the safety performance.

Description

Technical Field

[0001] This application relates to batteries, and more particularly to a battery pack and an electrical device. Background Technology

[0002] With the development of science and technology and the continuous increase in energy demand, the application fields of battery packs are becoming increasingly wide. A battery pack is a charging and discharging device that converts chemical energy into electrical energy. A battery pack typically consists of a casing and multiple battery cells located inside the casing. Each battery cell is equipped with an explosion-proof valve, which is a pressure relief valve designed to prevent the battery pack from exploding under extreme operating conditions due to large impacts or other shocks.

[0003] However, the battery pack has poor safety performance. Utility Model Content

[0004] This application provides a battery pack and electrical equipment to improve the safety performance of the battery pack.

[0005] In a first aspect, embodiments of this application provide a battery pack, comprising:

[0006] The box-shaped enclosure has a receiving cavity;

[0007] At least one battery module is disposed in the receiving cavity. The battery module includes multiple battery cells. The extending direction of each battery cell intersects the height direction of the housing. At least one of the two end faces of each battery cell opposite to each other along the extending direction is provided with a first explosion-proof valve.

[0008] Structural adhesive is disposed within the receiving cavity, and the structural adhesive is bonded between the battery cell and the housing, and is spaced apart from the first explosion-proof valve.

[0009] In some possible implementations, the plurality of cells includes at least one first cell located near the bottom wall of the receiving cavity, and the first cell is in contact with and fixed to the structural adhesive.

[0010] In some possible implementations, the plurality of cells of each battery module are arranged in at least two layers along the height direction of the housing, with one layer of cells adjacent to the bottom wall of the receiving cavity forming the first cell.

[0011] In some possible implementations, the structural adhesive covers a portion of the outer surface of the first battery cell, and the explosion-proof valve of the first battery cell and the structural adhesive are spaced apart.

[0012] In some possible implementations, the structural adhesive is made of at least one of epoxy resin and acrylate.

[0013] In some possible implementations, multiple battery modules are provided, and the multiple battery modules are arranged and connected along a first direction, which intersects the height direction of the housing.

[0014] In some possible implementations, the first direction is parallel to the length direction of the housing;

[0015] And / or, the extending direction of the battery cell is parallel to the length direction of the housing.

[0016] In some possible implementations, the battery pack further includes connecting tabs that connect multiple battery modules.

[0017] In some possible implementations, the battery module further includes a busbar connected to the battery cells in the battery module;

[0018] The connecting piece is connected to the busbar of the plurality of battery modules.

[0019] In some possible implementations, the battery module further includes:

[0020] A bracket assembly for securing the battery cells in the battery module.

[0021] In some possible implementations, multiple battery modules are provided, and the battery pack further includes:

[0022] The first connector is used to connect the bracket assembly in two adjacent battery modules.

[0023] In some possible implementations, the housing includes:

[0024] The lower housing has a first chamber and a first opening communicating with the first chamber;

[0025] An upper housing is connected to the lower housing. The upper housing has a second chamber and a second opening communicating with the second chamber. The first opening and the second opening are opposite to and connected to communicate the first chamber and the second chamber, forming the receiving cavity.

[0026] In some possible implementations, the inner wall of the first chamber and / or the inner wall of the second chamber are provided with a first reinforcing rib.

[0027] In some possible implementations, the lower housing includes:

[0028] Base plate;

[0029] A first side plate is connected to the bottom plate, and the first side plate and the bottom plate form the first cavity. The end of the first side plate facing away from the bottom plate forms the first opening.

[0030] The upper housing includes:

[0031] Cover plate;

[0032] The second side plate is connected to the cover plate, and the second side plate and the cover plate form the second chamber. The end of the second side plate away from the cover plate forms the second opening.

[0033] In some possible implementations, the lower housing further includes:

[0034] The first outer edge is located at the end of the first side plate that is away from the bottom plate;

[0035] The upper housing also includes:

[0036] The second outer edge is disposed at one end of the second side plate away from the cover plate, and the second outer edge is opposite to and connected to the first outer edge.

[0037] In some possible implementations, the lower housing further includes:

[0038] The second reinforcing rib is disposed between the first outer edge and the first side plate;

[0039] And / or, the lower housing further includes:

[0040] At least one handle is provided on the side of the first side plate away from the first chamber.

[0041] In some possible implementations, the housing further includes:

[0042] A sealing gasket is disposed between the lower housing and the upper housing, and surrounds the first opening and the second opening.

[0043] In some possible implementations, the upper housing further includes:

[0044] The positive and negative terminals are located on the side of the upper housing opposite to the lower housing and are electrically connected to the battery module.

[0045] In some possible implementations, the upper housing is further provided with a second explosion-proof valve, which is located at the end of the upper housing away from the lower housing and is spaced apart from both the positive terminal and the negative terminal.

[0046] Secondly, embodiments of this application provide an electrical device including the battery pack described above.

[0047] The battery pack and electrical equipment provided in this application include a housing, at least one battery module, and structural adhesive. The housing has a receiving cavity. At least one battery module and structural adhesive are disposed within the receiving cavity. Each battery module includes multiple battery cells, the extension direction of which intersects the height direction of the housing. At least one of the two opposite end faces of each battery cell along its extension direction is provided with a first explosion-proof valve. This prevents electrolyte from impacting the first explosion-proof valve, thus preventing the first explosion-proof valve from being ruptured and preventing electrolyte leakage from the battery cell. The structural adhesive is bonded between the battery cells and the housing, ensuring a reliable connection between each battery module and the housing, improving the safety performance of the battery pack. Furthermore, the structural adhesive is spaced apart from the first explosion-proof valve and does not submerge the first explosion-proof valve, ensuring that the first explosion-proof valve can function normally, thereby ensuring the normal operation of the battery pack. Attached Figure Description

[0048] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0049] Figure 1 A three-dimensional view of a battery pack in related technologies;

[0050] Figure 2 A perspective view of the battery pack provided in this application;

[0051] Figure 3 A top view of the battery pack provided in this application;

[0052] Figure 4 A front view of the battery pack provided in this application;

[0053] Figure 5 A side view of the battery pack provided in this application;

[0054] Figure 6 Exploded view of the battery pack provided in this application;

[0055] Figure 7 A perspective view of the lower housing provided in this application;

[0056] Figure 8 A perspective view of the lower housing provided in this application from another angle;

[0057] Figure 9 A perspective view of the lower housing provided in this application from yet another angle;

[0058] Figure 10 Bottom view of the lower housing provided for this application;

[0059] Figure 11 A side view of the lower housing provided for this application;

[0060] Figure 12 Front view of the lower housing provided in this application;

[0061] Figure 13 Top view of the lower housing provided in this application;

[0062] Figure 14 A perspective view of the upper housing provided in this application;

[0063] Figure 15 A perspective view of the upper housing provided in this application from another angle;

[0064] Figure 16 A perspective view of the upper housing provided in this application from yet another angle;

[0065] Figure 17 Bottom view of the upper housing provided for this application;

[0066] Figure 18 Top view of the upper housing provided for this application;

[0067] Figure 19 A side view of the upper housing provided in this application;

[0068] Figure 20 Front view of the upper housing provided for this application;

[0069] Figure 21 Another side view of the upper housing provided in this application;

[0070] Figure 22 A perspective view of the battery module provided in this application;

[0071] Figure 23 A front view of the battery module provided in this application;

[0072] Figure 24 A side view of the battery module provided in this application;

[0073] Figure 25 A cross-sectional view of the battery module provided in this application;

[0074] Figure 26 A top view of the battery module provided in this application;

[0075] Figure 27 A bottom view of the battery module provided in this application;

[0076] Figure 28 A perspective view of the battery cell provided in this application;

[0077] Figure 29 A front view of the battery cell provided in this application;

[0078] Figure 30 A side view of the battery cell provided in this application;

[0079] Figure 31 Another side view of the battery cell provided in this application;

[0080] Figure 32 A perspective view of one orientation of the multiple battery modules provided in this application;

[0081] Figure 33 A perspective view of the multiple battery modules provided in this application from another angle;

[0082] Figure 34 A perspective view of another orientation of the multiple battery modules provided in this application;

[0083] Figure 35 Another perspective view of the multiple battery modules provided in this application;

[0084] Figure 36 A perspective view of the battery module and connector provided in this application;

[0085] Figure 37 A perspective view of the battery module and connector provided in this application from another angle;

[0086] Figure 38 A perspective view of the battery module and connector provided in this application from another angle;

[0087] Figure 39 A top view of the preceding battery module among two adjacent battery modules provided in this application;

[0088] Figure 40 This is a top view of the latter of two adjacent battery modules provided in this application.

[0089] Explanation of reference numerals in the attached figures:

[0090] 10-Battery pack; 11-Casing;

[0091] 20-Lower shell; 21-First chamber; 22-Bottom plate; 23-First side plate; 24-First outer edge; 25-Handle; 26-First reinforcing rib; 27-Second reinforcing rib;

[0092] 30 - Upper housing; 31 - Second chamber; 32 - Cover plate; 33 - Second side plate; 34 - Second outer edge; 35 - Positive terminal; 36 - Negative terminal; 37 - Signal terminal; 38 - Second explosion-proof valve;

[0093] 40-Battery module; 41-Battery cell; 42-First electrode; 43-Second electrode; 44-Third electrode; 45-Busseter; 46-Bracket; 47-Second connector; 48-First explosion-proof valve;

[0094] 50-Connecting piece;

[0095] 60 - First connector;

[0096] 70 - Sealing gasket. Detailed Implementation

[0097] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0098] In the prior art, see Figure 1 The battery pack 10 typically includes a housing, battery modules 40 housed within the housing, and a tray. The housing comprises a connected upper and lower casing, while the tray secures the battery management system (BMS). The battery module 40 is a single module housed in the lower casing. This module contains multiple cells, resulting in a relatively large number of cells and significant weight, leading to inefficient assembly. Furthermore, as... Figure 1 As shown, the battery pack 10 is relatively heavy. Therefore, in a normal drop test (below 1.5m), the battery module 40 experiences a greater impact along the Z-axis direction within the casing, resulting in poor safety performance.

[0099] Furthermore, the battery cells are placed vertically (along the Z-axis), which is also the orientation of the upper and lower housings. The positive and negative terminals of the battery cells are located along the Z-axis, and the explosion-proof valves of the battery cells are located on the positive and negative sides of the Z-axis. In the event of a drop, the electrolyte inside the battery cell can easily rupture the explosion-proof valve, causing the electrolyte to overflow. This makes it difficult to meet the requirement of preventing electrolyte leakage, thus affecting the normal operation of the entire battery pack 10, meaning the battery pack will experience drop failure.

[0100] In the battery pack and electrical equipment provided in this application, the extending direction of the battery cells disposed within the housing cavity intersects with the height direction of the housing, and at least one end face of each battery cell opposite to the other along its extending direction is provided with a first explosion-proof valve, so that the first explosion-proof valve is positioned laterally relative to the battery cell, reducing the impact of the electrolyte inside the battery cell on the first explosion-proof valve. Structural adhesive is bonded between the battery cells and the housing, and spaced apart from the first explosion-proof valve, ensuring reliable connection between each battery module and the housing, while also ensuring the normal operation of the first explosion-proof valve.

[0101] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0102] This application provides an electrical device, including electric vehicles, electric trains, electric bicycles, golf carts, mobile phones, portable devices, laptops, electric toys, power tools, and ships. The electric vehicles include pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles.

[0103] See Figures 2 to 40 The electrical device includes a battery pack 10, which stores and provides electrical energy. The battery pack 10 is, for example, a lithium-ion battery pack, which has high specific energy per cell and low internal resistance, resulting in good driving range. The specific type of battery pack 10 is not limited in this application embodiment; it can be selected as needed.

[0104] The battery pack 10 includes a housing 11, at least one battery module 40, and structural adhesive. The housing 11 has a receiving cavity. Both the at least one battery module 40 and the structural adhesive are disposed within the receiving cavity. Each battery module 40 includes multiple battery cells 41, the extending direction of each battery cell 41 intersecting the height direction of the housing 11, and at least one of the two opposite end faces of each battery cell 41 along its extending direction is provided with a first explosion-proof valve 48. The structural adhesive is bonded between the battery cells and the housing, and is spaced apart from the first explosion-proof valve 48.

[0105] Among them, see Figures 2 to 20The housing 11 provides support and protection for the battery module 40 and other structures. The housing 11 can form a closed structure to meet requirements such as waterproofing and dustproofing. For example, the housing 11 includes a lower housing 20 and an upper housing 30. The lower housing 20 has a first chamber 21 and a first opening communicating with the first chamber 21. The upper housing 30 is connected to the lower housing 20 and has a second chamber 31 and a second opening communicating with the second chamber 31. The first opening and the second opening are opposite to and connected to connect the first chamber 21 and the second chamber 31, forming a receiving cavity. With this configuration, the housing 11 is assembled from the lower housing 20 and the upper housing 30, facilitating the installation of the battery module 40.

[0106] It is understandable that the upper shell 30 and the lower shell 20 are arranged opposite each other and sealed together along the height direction of the housing 11, and the height direction of the housing 11 is also vertical. Figure 6 The Z direction is shown. (As shown) Figure 6 As shown, the first opening of the lower housing 20 faces upward and the second opening of the upper housing 30 faces downward, so that the first opening and the second opening can be opposite each other, and the first opening and the second opening are connected to communicate the first chamber 21 and the second chamber 31 to form a receiving cavity.

[0107] In some possible examples, the material of housing 11 is at least one of metal, plastic, ceramic, and composite materials, that is, the material of upper shell 30 and lower shell 20 is at least one of metal, plastic, ceramic, and composite materials. Composite materials include carbon fiber composites, glass fiber reinforced composites, sheet molding compounds (SMC), etc. For example, both upper shell 30 and lower shell 20 are ordinary cold-rolled carbon steel sheets or strips (SPCC). In this way, both upper shell 30 and lower shell 20 can be bent into thin-walled structures with a certain strength. Of course, the material of upper shell 30 and lower shell 20 is not limited, and other materials with a certain strength can also be used.

[0108] To improve the strength of the upper shell 30 and / or the lower shell 20, the inner wall of the first chamber 21 and / or the inner wall of the second chamber 31 are provided with first reinforcing ribs 26, which can be formed by stamping. Compared to increasing the strength of the upper shell 30 and / or the lower shell 20 by increasing the thickness, providing first reinforcing ribs 26 to increase the strength of the upper shell 30 and / or the lower shell 20 can improve the strength of the housing 11 and reduce costs. The aforementioned inner wall refers to the inner surface of the corresponding chamber, i.e., the inner wall surface, including the side walls and the bottom wall, wherein the bottom wall is opposite to the opening. Specifically, the bottom wall of the first chamber 21 refers to the inner wall of the first chamber 21 away from the first opening, and the bottom wall of the second chamber 31 refers to the inner wall of the second chamber 31 away from the second opening.

[0109] For example, such as Figure 8 and Figure 9 As shown, the side walls and bottom walls of the first chamber 21 are provided with first reinforcing ribs 26, that is, the first reinforcing ribs 26 can be provided on the bottom plate 22 and the first side plate 23 to improve the strength of the lower housing 20, thereby improving the reliability of the battery module 40 and reducing costs. Multiple first reinforcing ribs 26 on the bottom wall of the first chamber 21 are arranged at intervals, and multiple first reinforcing ribs 26 on the side walls of the first chamber 21 are arranged intersectingly, for example, in a crisscross pattern.

[0110] For example, such as Figure 14 and Figure 15 As shown, the top wall of the second chamber 31 is provided with a first reinforcing rib 26, that is, the first reinforcing rib 26 can be provided on the cover plate 32 to improve the strength of the upper shell 30, thereby improving the reliability of the battery module 40 and reducing costs. Multiple first reinforcing ribs 26 on the bottom wall of the second chamber 31 are arranged intersectingly, for example, in a crisscross pattern.

[0111] See Figures 7 to 13 The lower shell 20 includes a bottom plate 22 and a first side plate 23. The first side plate 23 is connected to the bottom plate 22. The first side plate 23 and the bottom plate 22 form a first chamber 21. The end of the first side plate 23 facing away from the bottom plate 22 forms a first opening.

[0112] like Figure 9 As shown, the lower end of the first side plate 23 is connected to the bottom plate 22 (see reference). Figure 7 The first side plate 23 and the bottom plate 22 are connected, for example, the first side plate 23 and the bottom plate 22 are integral structures, and the upper end of the first side plate 23 forms a first opening. The first side plate 23 is annular, for example, the first side plate 23 is a rectangular ring. The inner surface of the first side plate 23 forms the side wall of the first chamber 21, and the top surface of the bottom plate 22 forms the bottom wall of the first chamber 21.

[0113] The lower housing 20 also includes a first outer edge 24, which is disposed at the end of the first side plate 23 opposite to the bottom plate 22 and surrounds the first side plate 23. For example, the first outer edge 24 is connected to the end of the first side plate 23 away from the bottom plate 22, such as... Figure 9 As shown, the first outer edge 24 is connected to the top of the first side plate 23, for example, the first outer edge 24 and the first side plate 23 are an integral structure. The first outer edge 24 surrounds the first side plate 23, for example, the first outer edge 24 completely surrounds the first side plate 23 circumferentially, that is, the first outer edge 24 surrounds the first side plate 23 for a full circumference. The first outer edge 24 can be formed by flanging on at least one side, such as... Figure 9 As shown, the first outer edge 24 is flanged twice, and the cross-section is an L-shaped plane perpendicular to the extension direction of the first outer edge 24.

[0114] like Figure 7As shown, the lower shell 20 also includes a second reinforcing rib 27, which is disposed between the first outer edge 24 and the first side plate 23 to increase the connection strength between the first outer edge 24 and the first side plate 23. Multiple second reinforcing ribs 27 can be provided, spaced apart circumferentially along the first side plate 23. The second reinforcing rib 27 can be L-shaped, triangular, rectangular, trapezoidal, etc.

[0115] like Figure 11 and Figure 12 As shown, the lower housing 20 also includes a handle 25, which is disposed on the side of the first side plate 23 away from the first chamber 21, for example, by means of a threaded fastener connected to the first side plate 23. The handle 25 is also located outside the first chamber 21, that is, the handle 25 is disposed on the outer surface of the first side plate 23. By providing a handle 25 on the outside of the lower housing 20, it is convenient to move the entire battery pack 10. The handle 25 can be rectangular, trapezoidal, etc., and can rotate up and down. The rotation axis of the handle is parallel to the first side plate 23, for example, the rotation axis extends along the width direction of the housing 11.

[0116] See Figures 14 to 21 The upper housing 30 includes a cover plate 32 and a second side plate 33. The second side plate 33 is connected to the cover plate 32. The second side plate 33 and the cover plate 32 form a second chamber 31. The end of the second side plate 33 facing away from the cover plate 32 forms a second opening.

[0117] like Figure 16 As shown, the upper end of the second side plate 33 is connected to the cover plate 32, for example, the second side plate 33 and the cover plate 32 are an integral structure, and the lower end of the second side plate 33 forms a second opening. The second side plate 33 is annular, for example, the second side plate 33 is a rectangular ring. The inner surface of the second side plate 33 forms the side wall of the second chamber 31, and the bottom surface of the cover plate 32 forms the bottom wall of the second chamber 31.

[0118] The upper housing 30 also includes a second outer edge 34, which is disposed at the end of the second side plate 33 opposite to the cover plate 32 and surrounds the second side plate 33. The second outer edge 34 is connected to the end of the second side plate 33 away from the cover plate 32, such as... Figure 16 As shown, the second outer edge 34 is connected to the bottom end of the second side plate 33, for example, the second outer edge 34 and the second side plate 33 are an integral structure. The second outer edge 34 surrounds the second side plate 33, for example, the second outer edge 34 completely surrounds the second side plate 33 circumferentially, that is, the second outer edge 34 surrounds the second side plate 33 for a full circumference. The second outer edge 34 can be formed by flanging on at least one side, such as... Figure 16 As shown, the second outer edge 34 is flanged once, with a plane perpendicular to the extension direction of the second outer edge 34 as the cross section. The cross section shape of the second outer edge 34 is rectangular, trapezoidal, etc.

[0119] The second outer edge 34 is opposite to and connected to the first outer edge 24 to achieve the connection between the upper housing 30 and the lower housing 20. See, for example, [reference needed]. Figure 6 , Figure 9 and Figure 16 The first outer edge 24 and the second outer edge 34 are connected by a threaded fastener, such as a bolt or nut assembly.

[0120] See some possible examples. Figure 3 and Figure 16 The upper housing 30 also includes a positive terminal 35 and a negative terminal 36. The positive terminal 35 and negative terminal 36 are located at the ends of the upper housing opposite to the lower housing and are electrically connected to the battery module 40 to enable input and output of the battery module 40. For example, after each battery module 40 is connected, it is connected to the positive terminal 35 and negative terminal 36 via an output terminal such as a circuit board to achieve conductivity. The positive terminal 35 and negative terminal 36 can be disposed on the cover plate 32.

[0121] The upper housing 30 also includes a signal terminal 37, which is spaced apart from the positive terminal 35 and the negative terminal 36 and connected to the battery management system to enable communication between the battery module 40 and the external device. For example, the signal terminal 37 is located on the cover plate 32.

[0122] A second explosion-proof valve 38 is also provided on the upper housing 30. The second explosion-proof valve 38 is located at the end of the upper housing 30 away from the lower housing 20, specifically on the top surface of the cover plate 32. It is used for pressure relief of the entire housing 11. The second explosion-proof valve 38 is spaced apart from the positive terminal 35 and the negative terminal 36 to ensure that the second explosion-proof valve 38 can work normally, thereby ensuring the safety and reliability of the battery pack.

[0123] The positive terminal 35 and the negative terminal 36 are, for example, spaced apart on the cover plate 32, and the signal terminal 37 is, for example, disposed on the second side plate 33. The cover plate 32 may have a step, and the positive terminal 35, the negative terminal 36, and the second explosion-proof valve 38 may all be disposed on the step surface, and the signal terminal 37 is disposed on the second side plate 33 adjacent to the step.

[0124] In other examples, the positive terminal 35, negative terminal 36, signal terminal 37, and second explosion-proof valve 38 may all be disposed on the stepped surface. The embodiments of this application do not limit the placement of the positive terminal 35, negative terminal 36, signal terminal 37, and second explosion-proof valve 38; these positions can be adjusted as needed.

[0125] To achieve a sealed connection between the upper housing 30 and the lower housing 20, refer to... Figure 6 , Figure 9 and Figure 16The enclosure 11 also includes a sealing gasket 70, which is disposed between the upper housing 30 and the lower housing 20 and surrounds the first opening and / or the second opening. By providing the sealing gasket 70, the sealing performance of the enclosure 11 can be increased, so that the receiving cavity forms a closed cavity, which can meet the waterproof and dustproof rating of IP67 and above.

[0126] For example, a sealing groove is provided on the surface of the upper housing 30 facing the lower housing 20, the sealing groove surrounds the first opening, and a sealing gasket 70 is provided inside the sealing groove. As another example, the sealing groove may also be located on a portion of the first outer edge and offset from a corresponding mounting hole on the first outer edge 24, which is used to engage with a threaded fastener to achieve relative fixation between the first outer edge 24 and the second outer edge 34. In other examples, the sealing groove may be partially provided in the upper housing 30 and partially in the lower housing 20; this embodiment is not limited to this.

[0127] See Figure 6 The cavity contains one or more battery modules 40, for example, one battery module 40 or at least two battery modules 40. Figure 5 As shown, four battery modules 40 are arranged inside the cavity. By setting at least two battery modules 40, each with the same structure, modular and standardized modules can be formed, improving assembly efficiency and operational efficiency while reducing costs.

[0128] See Figures 22 to 27 Each battery module 40 includes multiple battery cells 41, which can be cylindrical or prismatic, and this embodiment is not limited to either. The multiple battery cells 41 within each battery module 40 are arranged in an array. For example, each battery module 40 includes 36 battery cells 41, which are arranged in a 6x6 grid, forming a 6x6 array. These 36 battery cells 41 are, for example, all cylindrical.

[0129] In some possible implementations, multiple cells 41 within each battery module 40 are spaced apart along the height direction of the housing 11 and also spaced apart along the width / length direction of the housing 11. For example... Figure 6 As shown, multiple battery cells 41 within each battery module 40 are arranged at intervals along the height direction of the housing 11 and at intervals along the width direction of the housing 11. This allows at least two battery modules 40 to be arranged at intervals along the length direction of the housing 11, improving space utilization. In other examples, multiple battery cells 41 within each battery module 40 are arranged at intervals along the height direction of the housing 11 and at intervals along the length direction of the housing 11.

[0130] The multiple cells 41 in each battery module 40 have the same orientation. When there are two or more battery modules 40, the orientation of each battery module 40 is also the same, that is, the orientation of the cells 41 is the same, so as to achieve standardization and modularization and improve work efficiency. Here, the orientation of the cell 41 refers to the orientation of the electrodes of the cell 41.

[0131] See 28 to Figure 31 The battery cell 41 has two end faces that are opposite each other along the extending direction, which is also the axial direction of the battery cell 41. Both end faces of the battery cell 41 are opposite to the side wall of the receiving cavity. On one end face, a first electrode 42 and a second electrode 43 are provided at intervals, and on the other end face, a third electrode 44 is provided.

[0132] In this configuration, the first electrode 42 and the second electrode 43 have opposite polarities; for example, the first electrode 42 is positive and the second electrode 43 is negative. The first electrode 42 and the second electrode 43 each form a single, continuous region, with the first electrode 42 surrounding the second electrode 43. This arrangement of the first and second electrodes on the same side facilitates external connections. The third electrode 44 has the same polarity as the first electrode 42; for example, both the third electrode 44 and the first electrode 42 are positive. The third electrode 44 can have two or more sections.

[0133] It is understood that the cell 41 can also use other forms of electrodes. For example, a first electrode 42 can be provided on one end face of the cell 41, and a second electrode 43 can be provided on the other end face. The first electrode 42 and the second electrode 43 have opposite polarities. The first electrode 42 and the second electrode 43 are located at opposite ends of the cell 41 along the extension direction, which can minimize the electron transport path, increase the transport rate, and reduce heat generation, thereby improving the safety performance of the battery pack 10.

[0134] The first explosion-proof valve 48 of the battery cell 41 is disposed on at least one of the two opposite end faces of the battery cell 41 along its extension direction. For example, the first explosion-proof valve 48 is located on the same end face as the first electrode 42. The first explosion-proof valve 48 can release pressure when the battery cell 41 is subjected to a large impact or other shock, thereby preventing the battery cell 41 from exploding. The first explosion-proof valve 48 can adopt an existing structure, which will not be described in detail here.

[0135] Continue reading Figure 6 and Figure 28The extension direction of each battery cell 41 intersects the height direction of the housing 11, so that the first explosion-proof valve 48 is opposite to the side wall of the receiving cavity. Thus, with each battery cell 41 placed laterally, the first explosion-proof valve 48 is also placed laterally, located to the side of the battery cell 41, directly opposite the side wall of the receiving cavity. In a vertical drop test, this prevents electrolyte from impacting the first explosion-proof valve 48, thus preventing the first explosion-proof valve 48 from being ruptured and preventing electrolyte leakage from the battery cell 41, ensuring the normal operation of the battery pack 10.

[0136] In some possible examples, the extension direction of each cell 41 is perpendicular to the height direction of the housing 11, so that each cell 41 is placed horizontally. For example, the extension direction of the cell 41 is parallel to the length direction of the housing 11, and the extension direction of the cell 41 is consistent with the length direction of the housing 11, which can improve space utilization.

[0137] In some possible examples, multiple battery modules 40 are arranged and connected along a first direction, which intersects the height direction of the housing 11. By arranging individual battery modules 40 side-by-side to form a multi-module structure and connecting the battery modules 40, assembly efficiency is high and assembly processing costs are low. Adjacent battery modules 40 are mechanically connected to fix them relatively, and also electrically connected to achieve series and parallel connection of the battery cells 41. This allows for the standardization and modularization of the battery modules 40, improving operational efficiency.

[0138] In the example above, see Figure 6 At least two battery modules 40 are arranged in a direction (i.e., the first direction) parallel to the length direction of the housing 11 to make full use of space. Furthermore, the extension direction of the cell 41 and the arrangement direction of at least two battery modules 40 are consistent with (e.g., parallel to) the length direction of the housing 11, resulting in high space utilization and the battery pack 10 is not too long.

[0139] See Figures 22 to 27 Each battery module 40 also includes a support assembly for fixing the battery cells 41 within the battery module. Multiple battery cells 41 are fixed using the support assembly to form a single battery module 40. In some possible examples, the support assembly includes two supports 46 and a second connector 47. The two supports 46 are respectively disposed at the first and second ends of corresponding multiple battery cells 41, with the second end opposite to the first end along the extending direction of the battery cell 41. The second connector 47 connects the two supports 46. Thus, the two supports 46 fix both ends of the battery cell 41, and the second connector 47 fixes the two supports 46 relative to each other, forming a single battery module 40.

[0140] In this embodiment, at least one of the two supports 46 is made of at least one of alloy plastic, plastic, rubber, or composite material. For example, both supports 46 may be made of alloy plastic, which is a mixture of polycarbonate (PC) and acrylonitrile-butadiene-styrene copolymer (ABS). It is a thermoplastic plastic made of PC and ABS alloy, possessing the moldability of ABS and the excellent mechanical properties, impact strength, temperature resistance, and ultraviolet (UV) resistance of PC. The material of the supports 46 is not limited in this application embodiment; other rigid insulating materials, such as polycarbonate, may also be used.

[0141] In some possible examples, the surfaces of the two brackets 46 facing each other are provided with grooves that are adapted to accommodate the battery cell 41. The surfaces of the two brackets 46 facing each other are also provided with mounting posts with through holes extending to the brackets 46 and having internal threads. The second connector 47 is a threaded member that is threadedly connected to the two brackets 46.

[0142] The mounting posts and recesses are located on the same side but staggered. The shape of the recess is the same as that of the battery cell 41, and the battery cell 41 can be placed inside the recess. The mounting posts of the two brackets 46 can contact each other to separate the second connector 47 from the battery cell 41. A through hole passes through the mounting post and the bracket 46 to facilitate the installation of the second connector 47. The through hole can be a stepped hole, and the inner wall of part of the through hole is provided with internal threads. The second connector 47 is a threaded component, such as a screw or bolt. By screwing the threaded component into the through hole, the two brackets 46 are fixed, and multiple battery cells 41 are fixed.

[0143] To connect multiple cells 41 within the battery module 40, the battery module 40 also includes a busbar 45. The busbar 45 is connected to each cell 41 to achieve series and parallel connection of multiple cells 41 within the same battery module 40. One or more busbars 45 may be provided as needed. When multiple busbars 45 are provided, they are located on the same side of the cells 41 and connected to the corresponding cells 41 to achieve electrical connection of multiple cells 41 within the corresponding battery module 40. For example, the number of busbars 45 may be one more than the number of rows / columns of cells 41. Figure 4 As shown, the busbar 45 has 7 units, and the battery cell 41 has 6 rows.

[0144] Among them, see Figure 26 , Figure 28 and Figure 30The first electrode 42 and the second electrode 43 of the battery cell 41 are disposed on the same side and have opposite polarities. Some of these busbars 45 are connected to the first electrode 42 of the battery cells 41 in the same row and to the second electrode 43 of the battery cells 41 in the adjacent row. In this way, the battery cells 41 in two adjacent rows are connected in series through the busbars 45, and the battery cells 41 in the same row are connected in parallel through the busbars 45.

[0145] In the two outermost rows of cells 41, the first electrode 42 of one row of cells 41 is connected to a busbar 45, which extends to the side of the cell 41. The second electrode 43 of the other row of cells 41 is connected to another busbar 45, which also extends to the side of the cell 41. The outermost busbar 45 is used to connect with other battery modules 40 to achieve series and parallel connection of all cells 41.

[0146] In some possible examples, the busbars 45 connecting two adjacent rows of cells 41 have the same structure, for example, they all include a long strip-shaped body and multiple extensions disposed on one side of the body, with the multiple extensions located on the same side of the corresponding body. The body is connected to the first electrode 42 of a row of cells 41, and the multiple extensions are respectively connected to the second electrode 43 of the adjacent row of cells 41.

[0147] It is understandable that the busbar 45 can be made of metal, such as copper, and the busbar 45 can be magnetically or adhesively connected to the bracket assembly. The specific structure of the busbar 45 and the connection method with the battery cell 41 are adaptively adjusted according to the series and parallel connection relationship between the multiple battery cells 41 in each battery module 40.

[0148] To achieve electrical connection between battery modules 40, refer to... Figures 32 to 40 The battery pack 10 also includes connecting tabs 50, through which multiple battery modules 40 are connected. For example, one connecting tab 50 is provided between every two adjacent battery modules 40 to achieve series-parallel connection of the cells 41 in these two battery modules 40. Another example is that the connecting tabs 50 connect all the battery modules 40. The connecting tabs 50 are located beside the battery modules 40, and the surface of the connecting tabs 50 facing away from the battery modules 40 is coated with an insulating material to achieve electrical isolation between the connecting tabs 50 and the housing 11.

[0149] In some possible implementations, the connecting piece 50 contacts all the busbars 45 in the plurality of battery modules 40 to achieve electrical conduction between the battery modules 40. For example, the connecting piece 50 is connected to the outermost busbar 45 among the plurality of busbars 45, for example, by contacting the folded edge of the busbar 45, and is fixed to the bracket 46 by threaded fasteners. The connecting piece 50 can be disposed beside the battery module 40 for easy installation. Figure 37 and Figure 38 As shown, at least two connecting pieces 50 may be provided, and these connecting pieces 50 are arranged crosswise on opposite sides of the battery module 40 along the first direction.

[0150] For example, four battery modules 40 are arranged sequentially. Connecting pieces 50 connecting the first and second battery modules 40, and connecting pieces 50 connecting the third and fourth battery modules 40, are located on the same side of the battery modules 40. Connecting pieces 50 connecting the second and third battery modules 40 are located on opposite sides of the battery modules 40. In this embodiment, the number and position of the connecting pieces 50 are not limited and can be adjusted according to the series and parallel connection requirements of the battery cells 41.

[0151] In some possible examples, such as Figure 37 and Figure 38 As shown, there are four battery modules 40, each with 36 cells 41 arranged in 6 rows and 6 columns. Cells 41 in the same row are connected in parallel and in series with cells 41 in adjacent rows. In two adjacent battery modules 40, the latter battery module 40 is rotated 180° relative to the former battery module 40 along the arrangement direction. Connecting pieces 50 allow for the series connection of opposite cells 41 in adjacent battery modules 40. In this way, all cells 41 form a 6-parallel, 24-series connection.

[0152] It is understandable that, such as Figure 39 and Figure 40 As shown, in two adjacent battery modules 40, one battery module 40 is rotated 180° relative to the other battery module 40 in the plane. Combined with... Figure 31 and Figure 37 One of the battery modules 40 has a busbar 45 at the top connected to the first electrode 42 of the row of cells 41, and the other battery module 40 has a busbar 45 at the top connected to the second electrode 43 of the row of cells 41. The connecting piece 50 connects the busbars 45 at the top of the two battery modules 40, which can realize the series connection of the outer row of cells 41 in the two battery modules 40.

[0153] It is also understood that the angle of adjacent battery modules 40, the position and number of connecting pieces 50 are related to the series and parallel connection method of all battery cells 41, and can be adjusted to achieve different series and parallel connection methods for all battery cells 41. This application embodiment is not limited in this respect. For example, the angles of two adjacent battery modules 40 are the same, and the connecting pieces 50 are connected to the busbars 45 in the two battery modules 40 respectively.

[0154] To achieve mechanical connection between adjacent battery modules 40, see [link / reference] Figures 32 to 35 The battery pack 10 also includes a first connector 60, which connects the support assemblies in two adjacent battery modules 40. For example... Figure 6 As shown, the bracket assemblies of two adjacent battery modules 40 are provided with through holes, and internal threads are provided in the through holes. The first connector 60 is, for example, a screw or bolt. Specifically, the first connector 60 can connect two adjacent brackets 46, for example, by threading it to two brackets 46. In other examples, the first connector 60 can also be a bolt and nut assembly, and the through hole can be a light hole.

[0155] In some possible implementations, the battery pack 10 also includes structural adhesive, which is bonded between the battery cell 41 and the housing 11 and spaced apart from the first explosion-proof valve 48. The structural adhesive connects the battery cell 41 and the housing 11, for example, by bonding the battery cell 41 to the lower housing 20, thereby fixing the battery cell 41 within the housing 11, ensuring the overall structural strength of the battery pack 10, and thus ensuring the safety performance of the battery pack 10.

[0156] For example, structural adhesive is disposed between the battery cell 41 and the bottom wall of the receiving cavity, bonding the battery cell 41 to the bottom wall of the receiving cavity. Also for example, structural adhesive is disposed between the battery cell 41 and the side wall of the receiving cavity, bonding the battery cell 41 to the side wall of the receiving cavity.

[0157] In some possible implementations, the structural adhesive is in contact with a portion of the battery cell 41, that is, the structural adhesive bonds a portion of the battery cell 41 in the battery module 40. In this way, the portion of the battery cell 41 is fixed to the housing 11 by the structural adhesive, which facilitates the exposure of the first explosion-proof valve 48 of each battery cell 41.

[0158] The battery modules 41 include at least one first battery cell, which is located near the bottom wall of the receiving cavity and is in contact with and fixed by structural adhesive. The first battery cell is the one 41 in the battery module 40 that is closest to the bottom wall of the receiving cavity (i.e., the base plate 22), and it is located at one end of the battery module 40 adjacent to the bottom wall of the receiving cavity. Each battery module 40 is fixed to the housing 11 by the first battery cell. The first battery cell can be in contact with the bottom wall of the receiving cavity or can be spaced apart from the bottom wall of the receiving cavity.

[0159] It is understood that multiple cells 41 within the same battery module 40 are relatively fixed together to form a single unit, for example, these cells 41 are connected by a support assembly. Thus, by bonding the bottom wall of the adjacent receiving cavity and the first cell adjacent to it with structural adhesive, the relative fixation between the entire battery module 40 and the housing 11 can be achieved. That is, by bonding the cells 41 of the battery module 40 near the bottom wall of the receiving cavity to the bottom wall of the receiving cavity with structural adhesive, the battery module 40 is fixed within the housing 11.

[0160] In some possible examples, the multiple cells 41 of each battery module 40 are arranged in at least two layers along the height direction of the housing 11, with the layer of cells 41 adjacent to the bottom wall of the receiving cavity forming the first cell. In each battery module 40, multiple cells 41 form at least two layers, these layers are arranged along the height direction of the housing 11, and each layer has one or more cells 41. The layer of cells 41 closest to the bottom wall of the receiving cavity forms the first cell, that is, the bottommost cell 41 forms the first cell, and this layer of cells 41 is connected to the housing 11 by structural adhesive, while the remaining cells 41 are not connected to structural adhesive.

[0161] The structural adhesive also covers part of the outer surface of the first battery cell, meaning that a portion of the first battery cell is immersed in the structural adhesive, increasing the contact area between the first battery cell and the structural adhesive and improving the reliability of the bond. The structural adhesive is also spaced apart from the first explosion-proof valve 48, meaning that the structural adhesive does not submerge the first explosion-proof valve 48; the first explosion-proof valve 48 is exposed to ensure that it can properly release pressure.

[0162] Understandably, the first explosion-proof valve 48 is disposed on at least one of the two opposite end faces of the battery cell 41 along its extension direction. The battery cell 41 extends laterally, and the first explosion-proof valve 48 is disposed laterally relative to the battery cell 41, that is, the first explosion-proof valve 48 protrudes to the side relative to the battery cell 41, and the first explosion-proof valve 48 is opposite to the side wall of the receiving cavity. The surface of the structural adhesive away from the bottom wall of the receiving cavity is lower than the first explosion-proof valve 48, and covers the portion of the first battery cell 41 below the first explosion-proof valve 48, ensuring the first explosion-proof valve 48 is exposed while maintaining connection strength, so that it can work normally.

[0163] Structural adhesive can be injected into the receiving cavity, with the injection amount related to the height of the first explosion-proof valve 48 to ensure that the structural adhesive is below the first explosion-proof valve 48. For example, the adhesive strength of the structural adhesive is greater than or equal to 10 MPa, and the thermal conductivity of the structural adhesive is greater than or equal to 1.0 W / (m·K). The structural adhesive has good thermal conductivity to facilitate rapid heat transfer generated by the operation of the battery module 40, ensuring the normal operation of the battery pack 10. The structural adhesive material includes insulating and thermally conductive materials; for example, the structural adhesive material includes at least one of epoxy resin and acrylate, such as epoxy structural adhesive or acrylate structural adhesive.

[0164] The battery pack 10 provided in this application includes a housing 11, at least one battery module 40, and structural adhesive. The housing 11 has a receiving cavity. Both the at least one battery module 40 and the structural adhesive are disposed within the receiving cavity. Each battery module 40 includes multiple battery cells 41. The extending direction of each battery cell 41 intersects the height direction of the housing 11, and at least one of the two opposite end faces of each battery cell 41 along its extending direction is provided with a first explosion-proof valve 48. This prevents electrolyte from impacting the first explosion-proof valve 48, thus preventing the first explosion-proof valve 48 from being ruptured and preventing electrolyte leakage from the battery cell 41. The structural adhesive is bonded between the battery cell 41 and the housing 11, ensuring a reliable connection between each battery module 40 and the housing 11, improving the safety performance of the battery pack 10. Furthermore, the structural adhesive is spaced apart from the first explosion-proof valve 48, ensuring that the first explosion-proof valve 48 is exposed and can function normally, thereby ensuring the normal operation of the battery pack 10.

[0165] The embodiments or implementation methods described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. In this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with an embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0166] Finally, it should be noted that other embodiments of the present invention will readily conceive of by those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any modifications, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A battery pack, characterized in that, include: The box (11) has a receiving cavity; At least one battery module (40) is disposed in the receiving cavity. The battery module (40) includes a plurality of battery cells (41). The extending direction of each battery cell (41) intersects the height direction of the housing (11), and at least one of the two end faces of each battery cell (41) opposite to each other along the extending direction is provided with a first explosion-proof valve (48). Structural adhesive is disposed within the receiving cavity, and the structural adhesive is bonded between the battery cell (41) and the housing (11), and is spaced apart from the first explosion-proof valve (48).

2. The battery pack according to claim 1, characterized in that, The plurality of cells (41) includes at least one first cell, which is located near the bottom wall of the receiving cavity and is in contact with and fixed to the structural adhesive.

3. The battery pack according to claim 2, characterized in that, The plurality of cells (41) of each battery module (40) are arranged in at least two layers along the height direction of the housing (11), and the cell (41) adjacent to the bottom wall of the receiving cavity forms the first cell.

4. The battery pack according to claim 2, characterized in that, The structural adhesive covers part of the outer surface of the first battery cell, and the explosion-proof valve of the first battery cell and the structural adhesive are spaced apart.

5. The battery pack according to claim 1, characterized in that, The structural adhesive is made of at least one of epoxy resin and acrylate.

6. The battery pack according to claim 1, characterized in that, Multiple battery modules (40) are provided, and the multiple battery modules (40) are arranged along a first direction, which intersects the height direction of the housing (11).

7. The battery pack according to claim 6, characterized in that, The first direction is parallel to the length direction of the box (11); And / or, the extension direction of the battery cell (41) is parallel to the length direction of the housing (11).

8. The battery pack according to claim 6, characterized in that, The battery pack (10) also includes a connecting piece (50) that connects to a plurality of the battery modules (40).

9. The battery pack according to claim 8, characterized in that, The battery module (40) also includes a busbar (45) which is connected to the battery cell (41) in the battery module. The connecting piece (50) is connected to the busbar (45) of the plurality of battery modules (40).

10. The battery pack according to any one of claims 1-9, characterized in that, The battery module (40) also includes: A bracket assembly for securing the battery cell (41) in the battery module.

11. The battery pack according to claim 10, characterized in that, The battery module (40) is provided in multiple ways, and the battery pack (10) further includes: The first connector (60) is used to connect the bracket assembly in two adjacent battery modules (40).

12. The battery pack according to any one of claims 1-9, characterized in that, The housing (11) includes: The lower housing (20) has a first chamber (21) and a first opening communicating with the first chamber (21); The upper housing (30) has a second chamber (31) and a second opening communicating with the second chamber (31); The first opening and the second opening are opposite to and connected to communicate the first chamber (21) and the second chamber (31) to form the receiving cavity.

13. The battery pack according to claim 12, characterized in that, The inner wall of the first chamber (21) and / or the inner wall of the second chamber (31) are provided with a first reinforcing rib (26).

14. The battery pack according to claim 12, characterized in that, The lower housing (20) includes: Base plate (22); The first side plate (23) is connected to the bottom plate (22). The first side plate (23) and the bottom plate (22) form the first chamber (21). The end of the first side plate (23) facing away from the bottom plate (22) forms the first opening. The upper housing (30) includes: Cover plate (32); The second side plate (33) is connected to the cover plate (32). The second side plate (33) and the cover plate (32) form the second chamber (31). The end of the second side plate (33) away from the cover plate (32) forms the second opening.

15. The battery pack according to claim 14, characterized in that, The lower housing (20) also includes: The first outer edge (24) is disposed at one end of the first side plate (23) away from the bottom plate (22); The upper housing (30) also includes: The second outer edge (34) is disposed at one end of the second side plate (33) away from the cover plate (32), and the second outer edge (34) is opposite to and connected to the first outer edge (24).

16. The battery pack according to claim 15, characterized in that, The lower housing (20) also includes: The second reinforcing rib (27) is disposed between the first outer edge (24) and the first side plate (23); And / or, the lower housing (20) further includes: At least one handle (25) is provided on the side of the first side plate (23) away from the first chamber (21).

17. The battery pack according to claim 12, characterized in that, The housing (11) also includes: A sealing gasket (70) is disposed between the lower housing (20) and the upper housing (30) and surrounds the first opening and / or the second opening.

18. The battery pack according to claim 12, characterized in that, The upper housing (30) also includes: Positive terminal (35) and negative terminal (36) are located on the side of the upper housing (30) away from the lower housing (20) and are electrically connected to the battery module (40).

19. The battery pack according to claim 18, characterized in that, The upper housing (30) is also provided with a second explosion-proof valve (38), which is located at one end of the upper housing (30) away from the lower housing (20) and is spaced apart from the positive terminal (35) and the negative terminal (36).

20. An electrical appliance, characterized in that, Includes the battery pack (10) as described in any one of claims 1-19.

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