Battery pack and electric device

Abstract

The application provides a battery pack and an electric device. The battery pack comprises a shell, a battery module and a first gel body. The shell comprises a bottom plate, a first side plate and a second side plate. The battery module is located between the first side plate and the second side plate. The battery module comprises a plurality of battery cells arranged along a third direction. Each battery cell comprises an electrode assembly, a packaging bag and a tab connected to the electrode assembly. The packaging bag has a sealing part. The tab extends from the sealing part to the outside of the packaging bag. There is a first space between the sealing parts of two adjacent battery cells. The first side plate is provided with a first through hole. The first through hole penetrates the first side plate along a first direction. The first through hole is in communication with part of the first space. The first gel body is at least partially arranged in the first space. The first through hole is configured to arrange a first insulating material in the first space to form the first gel body. The first gel body can improve the heat conduction capacity between the battery cells and the shell. The first through hole is also conducive to the ventilation and heat dissipation of the battery pack and conducive to improving the air tightness of the battery pack.

Description

Technical Field

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

[0002] When a battery pack is used under high-rate, non-static, continuous charge and discharge conditions (such as in agricultural drone battery packs), it can cause the cell temperature to become too high, which is detrimental to the use of the battery pack. Summary of the Invention

[0003] This application provides a battery pack and an electrical device to improve the heat dissipation capacity of the battery pack.

[0004] This application provides another battery pack, which includes a housing, a battery module, and a first colloid. The housing includes a bottom plate, a first side plate, and a second side plate, which are disposed opposite to each other along a first direction. The bottom plate connects the first side plate and the second side plate. The battery module is located between the first side plate and the second side plate. The battery module includes a plurality of cells arranged along a third direction. Each cell includes an electrode assembly, a packaging bag, and a tab connected to the electrode assembly. The packaging bag has a sealing portion, and the tab extends out of the packaging bag from the sealing portion. A first space exists between the sealing portions of two adjacent cells. The first side plate is provided with a first through hole, which penetrates the first side plate along the first direction and communicates with a portion of the first space. The first colloid is at least partially disposed in the first space, and the first through hole is configured to dispose of a first insulating material in the first space to form the first colloid.

[0005] In the above technical solution, a first insulating material is injected into the casing through a first through-hole and cured to form a first colloid. This first colloid fills the first space between the sealing portions of two adjacent battery cells. The first colloid improves the thermal conductivity between the battery cells and the casing, and the first through-hole also facilitates ventilation and heat dissipation of the battery pack, thereby enhancing its heat dissipation capacity. The first colloid filling the first space between the sealing portions of two adjacent battery cells helps alleviate the deformation problem of adjacent battery cells. Injecting the first colloid into the casing also helps improve the airtightness of the battery pack.

[0006] In some embodiments, a portion of the first colloid is located in the first through-hole.

[0007] In some embodiments, the second side plate is provided with a second through hole, which extends through the second side plate along a first direction, and the second through hole communicates with a portion of the first space.

[0008] In some embodiments, a portion of the first colloid is located in the second through-hole.

[0009] In some embodiments, along the first direction, the projections of the first through hole and the second through hole overlap.

[0010] In some embodiments, the battery module further includes a first circuit board, the tabs are connected to the first circuit board, the first circuit board and the packaging bag are arranged along a second direction, and the first direction, the second direction and the third direction are perpendicular to each other; a portion of the first colloid is connected to the first circuit board.

[0011] In some embodiments, the battery pack further includes a bracket, the bracket and the battery module are arranged along a third direction, and the bracket is provided with a third through hole; the battery pack further includes a first end plate, a second end plate and a second colloid, the first end plate, the second end plate and the housing form a box, the second colloid is disposed in the gap between the first end plate and the first circuit board, and the third through hole is configured to allow a third insulating material to be injected into the box to form the third colloid.

[0012] In some embodiments, along the third direction, the projection of the third through hole and the projection of the electrode assembly are offset.

[0013] In some embodiments, the bracket is configured to apply pressure to the battery module.

[0014] In some embodiments, the battery pack further includes a second circuit board and a connection component, the battery module and the second circuit board being arranged along the third direction; the connection component connects the first circuit board and the second circuit board, and the connection component is configured to transmit electrical signals and electrical energy of the battery module.

[0015] In some embodiments, along the first direction, there is a first gap between the first side plate and the battery module; the battery pack further includes a first heat-conducting element disposed in the first gap, and the battery module and the first side plate are connected through the first heat-conducting element; the first side plate and the second side plate are configured to move away from each other under the action of an external force, so as to place the battery module in the housing.

[0016] In some embodiments, the length of the first gap along the first direction is 0.05 mm to 2.5 mm.

[0017] In some embodiments, the length of the first gap along the first direction is 0.1 mm to 1.9 mm.

[0018] In some embodiments, the length of the first gap along the first direction is 0.1 mm to 1.4 mm.

[0019] In some embodiments, a second gap exists between the second side plate and the battery module; the battery pack further includes a second heat-conducting component disposed in the second gap; along the first direction, the length of the second gap is 0.05 mm to 2.5 mm.

[0020] In some embodiments, the length of the second gap along the first direction is 0.1 mm to 1.9 mm.

[0021] In some embodiments, the length of the second gap along the first direction is 0.1 mm to 1.4 mm.

[0022] Secondly, embodiments of this application provide an electrical device including the battery pack provided in any of the embodiments of the first aspect.

[0023] In the above technical solution, the battery pack in the first aspect embodiment has good heat dissipation capability, which can meet the power consumption conditions of high-rate, non-static, and continuous charging and discharging of electrical equipment, and also helps to improve the power safety of electrical equipment equipped with the battery pack. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0025] Figure 1 This is a schematic diagram of the structure of a battery pack provided in some embodiments of this application;

[0026] Figure 2 Exploded views of a battery pack provided in some embodiments of this application;

[0027] Figure 3 This is a schematic diagram of a battery module provided for some embodiments of this application;

[0028] Figure 4 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0029] Figure 5 This is a schematic diagram of the structure of a battery module provided in other embodiments of this application;

[0030] Figure 6 for Figure 5 A view of the battery module along the first direction;

[0031] Figure 7 This is a schematic diagram of the structure of the third heat-conducting element provided in some embodiments of this application;

[0032] Figure 8A schematic diagram of a battery module without a third heat-conducting component housed in a housing according to some embodiments of this application (without a first heat-conducting component and a second heat-conducting component);

[0033] Figure 9 for Figure 8 Enlarged view at point B1;

[0034] Figure 10 In order to be in Figure 8 A schematic diagram showing that a first heat-conducting element is provided in the first gap and a second heat-conducting element is provided in the second gap;

[0035] Figure 11 for Figure 10 Enlarged view at B2;

[0036] Figure 12 A schematic diagram of a battery module with a third heat-conducting element housed in a housing, provided for other embodiments of this application (without the first and second heat-conducting elements);

[0037] Figure 13 for Figure 12 Enlarged view at B3;

[0038] Figure 14 In order to be in Figure 12 A schematic diagram showing that a first heat-conducting element is provided in the first gap and a second heat-conducting element is provided in the second gap;

[0039] Figure 15 for Figure 14 Enlarged view at B4 in the middle;

[0040] Figure 16 for Figure 8 Enlarged view of point C1;

[0041] Figure 17 for Figure 10 Enlarged view of point C2 in the middle;

[0042] Figure 18 for Figure 12 Enlarged view of point C3 in the middle;

[0043] Figure 19 for Figure 14 Enlarged view of point C4 in the middle;

[0044] Figure 20 An exploded schematic diagram of the housing, the first reinforcing member, and the second reinforcing member provided for some embodiments of this application;

[0045] Figure 21 for Figure 20 A schematic diagram of the assembled middle shell, first reinforcing member, and second reinforcing member;

[0046] Figure 22This is a schematic diagram (exploded view of the housing) showing the housing and end plates not connected in some embodiments of this application.

[0047] Figure 23 A schematic diagram of the assembled housing, first reinforcing member, and second reinforcing member provided for some embodiments of this application;

[0048] Figure 24 A view of the housing, first reinforcing member and second reinforcing member after assembly, as provided in some embodiments of this application, viewed from the direction of the second opening;

[0049] Figure 25 for Figure 23 Enlarged view at point D1;

[0050] Figure 26 for Figure 23 Enlarged view at point D2;

[0051] Figure 27 This is a schematic diagram of the structure of the first end plate provided in some embodiments of this application;

[0052] Figure 28 for Figure 27 Enlarged view at point E1;

[0053] Figure 29 for Figure 27 Enlarged view at point E2;

[0054] Figure 30 This application provides structural schematic diagrams of the cover body for some embodiments;

[0055] Figure 31 for Figure 8 Enlarged view at B5 in the middle;

[0056] Figure 32 for Figure 8 Enlarged view at B6;

[0057] Figure 33 A view of the housing along a first direction provided for some embodiments of this application;

[0058] Figure 34 Axonometric views of the housing provided for some embodiments of this application;

[0059] Figure 35 Cross-sectional views of a battery pack provided in some embodiments of this application;

[0060] Figure 36 for Figure 35 Enlarged view at F1;

[0061] Figure 37 This is a schematic diagram showing the housing, first heat sink fins, and second heat sink fins before assembly, as provided in other embodiments of this application.

[0062] Figure 38 A schematic diagram showing the assembled housing, first heat dissipation fins, and second heat dissipation fins according to some embodiments of this application;

[0063] Figure 39 Exploded views of the battery pack provided in other embodiments of this application;

[0064] Figure 40 for Figure 2 A schematic diagram of the structure of the support;

[0065] Figure 41 for Figure 2 A schematic diagram of the support structure from another perspective;

[0066] Figure 42 A view of the bracket along a third direction provided for some embodiments of this application;

[0067] Figure 43 A view of the bracket along a first direction provided for some embodiments of this application;

[0068] Figure 44 A view of a battery module provided in some embodiments of this application along a first direction;

[0069] Figure 45 for Figure 41 Enlarged view of G1 in the middle;

[0070] Figure 46 A schematic diagram of a battery pack along a second direction provided for some embodiments of this application;

[0071] Figure 47 for Figure 46 A sectional view along the PP direction;

[0072] Figure 48 for Figure 47 Enlarged view of J1 in the middle;

[0073] Figure 49 for Figure 47 Enlarged view of J2 in the middle;

[0074] Figure 50 for Figure 30 Enlarged view of point K1 in the image;

[0075] Figure 51 A flowchart illustrating a method for manufacturing a battery pack according to some embodiments of this application;

[0076] Figure 52 This is a comparison image showing the shell before and after an external force was applied.

[0077] Icons: 100-Battery pack; 10-House; 11-Base plate; 12-First side plate; 121-Inner surface of the first side plate; 122-Outer surface of the first side plate; 123-Second threaded hole; 124-Fifth threaded hole; 125-First protrusion; 1251-First arc surface; 126-First recess; 127-First through hole; 128-First side plate opening; 129-Thirteenth threaded hole; 13-Second side plate; 131-Inner surface of the second side plate; 132-Outer surface of the second side plate; 133-Third threaded hole; 134-Sixth threaded hole; 135-Second protrusion; 1351-Second arc surface; 136-Second recess; 137-Second through hole; 138-Second side plate opening; 139-Tenth threaded hole Four threaded holes; 14-Second opening; 15-Third opening; 16-Fourth opening; 20-Battery module; 21-Battery cell; 22-First buffer; 23-Packaging bag; 231-Sealing part; 2310-First space; 2311-First sealing part; 2312-Second sealing part; 2313-Third sealing part; 232-Packaging body; 25-Taper; 24a-Positive electrode; 24b-Negative electrode; 26-First circuit board; 261-Total positive electrode; 262-Total negative electrode; 27-Third heat conductor; 271-Bottom wall; 272-Side wall; 2721-First side wall; 2722-Second side wall; 2723-Third side wall; 273-Notch; 274-Fifth opening; 28-Second buffer; 30-First heat conductor 50-Second heat-conducting component; 60-First reinforcing component; 61-First reinforcing part; 62-Second reinforcing part; 63-Third reinforcing part; 64-First slot; 70-Second reinforcing component; 71-Fourth reinforcing part; 72-Fifth reinforcing part; 73-Sixth reinforcing part; 74-Second slot; 80-First end plate; 81-First threaded hole; 82-First end plate body; 83-First snap-fit ​​part; 831-First limiting plate; 832-First protrusion; 84-First fin; 85-First groove; 86-Seventh threaded hole; 90-Second end plate; 91-Fourth threaded hole; 92-Second end plate body; 93-Second snap-fit ​​part; 931-Second limiting plate; 932-Second protrusion; 94-Second fin; 96-Eighth threaded part Hole; 110-Cover; 1101-Ninth threaded hole; 1102-Fourth groove; 120-Second circuit board; 130-First heat dissipation fin; 1301-First heat dissipation fin; 140-Second heat dissipation fin; 1401-Second heat dissipation fin; 150-Bracket; 1501-Tenth threaded hole; 1502-First surface; 1503-Second surface; 1504-Protrusion; 1505-Receiving part; 1506-Reinforcing rib; 1507-Connecting post; 15071-Eleventh threaded hole; 1508-Twelfth threaded hole; 1509-Third groove; 1510-Limiting part; 1511-Third through hole; A1-First gap; A2-Second gap; Q-Box body; Q1-First opening; D1-First colloid;D2 - Second colloid; W1 - First seal; W2 - Second seal; X - First direction; Y - Second direction; Z - Third direction; Detailed Implementation

[0078] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0079] Therefore, the following detailed description of embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the present application. Based on embodiments in this application.

[0080] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0081] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0082] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on this application. Furthermore, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0083] Currently, judging from market trends, battery packs are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in power tools, drones, energy storage devices, and many other fields. As the application areas of battery packs continue to expand, the market demand is also constantly increasing.

[0084] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate, and other performance parameters. In addition, whether the battery can charge and discharge normally as environmental conditions and / or internal battery conditions change is also a key factor to consider.

[0085] The inventors discovered that the internal temperature of the battery changes significantly during charging and discharging. When the battery is used under high-rate, continuous charging and discharging conditions (such as in agricultural drone batteries), the temperature of the cells inside the battery pack can become too high. To ensure normal charging and discharging of the battery pack, it is necessary to rapidly reduce the temperature of the cells.

[0086] Based on the above considerations, in order to improve the heat dissipation capacity of the battery pack, this application provides a battery pack, which includes a shell, a battery module, and a first colloid. The shell is U-shaped and includes a bottom plate, a first side plate, and a second side plate. The first side plate and the second side plate are disposed opposite each other along a first direction, and the bottom plate connects the first side plate and the second side plate. The battery module is located between the first side plate and the second side plate. The battery module includes a plurality of cells arranged along a third direction. Each cell includes an electrode assembly, a packaging bag, and a tab connected to the electrode assembly. The packaging bag has a sealing portion, and the tab extends out of the packaging bag from the sealing portion. There is a first space between the sealing portions of two adjacent cells. The first side plate is provided with a first through hole, which penetrates the first side plate along the first direction and communicates with a portion of the first space. The first colloid is at least partially disposed in the first space, and the first through hole is configured to dispose of a first insulating material in the first space to form the first colloid.

[0087] A first colloid is injected into the battery pack through a first through-hole. This colloid fills the first space between the sealing portions of two adjacent battery cells, improving thermal conductivity between the cells and the pack. The first through-hole also facilitates ventilation and heat dissipation, thus enhancing the pack's overall heat dissipation capacity. The colloid filling the first space between the sealing portions of two adjacent cells helps mitigate deformation issues. Injecting the colloid into the battery pack also improves its airtightness.

[0088] The battery pack disclosed in this application can be used, but is not limited to, in electrical equipment such as electric two-wheelers, power tools, drones, and energy storage devices. The battery pack with the operating conditions provided in this application can also be used as the power system for electrical equipment, which helps improve the heat dissipation capacity of the power system during charging and discharging and enhances the electrical safety of the electrical equipment.

[0089] This application provides an embodiment of an electrical device that uses a battery pack as a power source. The electrical device can be, but is not limited to, electronic devices, power tools, electric vehicles, drones, and energy storage devices. Electronic devices can include mobile phones, tablets, laptops, etc.; power tools can include electric drills, chainsaws, etc.; and electric vehicles can include electric cars, electric motorcycles, electric bicycles, etc.

[0090] like Figures 33-36As shown, the battery pack 100 includes a housing 10, a battery module 20, and a first gel D1. The housing 10 is U-shaped and includes a bottom plate 11, a first side plate 12, and a second side plate 13. The first side plate 12 and the second side plate 13 are arranged opposite each other along a first direction X. The bottom plate 11 connects the first side plate 12 and the second side plate 13. The battery module 20 is located between the first side plate 12 and the second side plate 13. The battery module 20 includes a plurality of cells 21 arranged along a third direction Z. Each cell 21 includes an electrode assembly (not shown in the figure), a packaging bag 23, and a connection to the electrode assembly. The electrode tab 25 and the packaging bag 23 have a sealing part 231. The electrode tab 25 extends out of the packaging bag 23 from the sealing part 231. There is a first space 2310 between the sealing parts 231 of two adjacent cells 21. The first side plate 12 is provided with a first through hole 127. Along the first direction X, the first through hole 127 penetrates the first side plate 12 and communicates with a portion of the first space 2310. The first colloid D1 is at least partially disposed in the first space 2310. The first through hole 127 is configured to dispose of the first insulating material in the first space 2310 to form the first colloid D1.

[0091] In some embodiments, the first side plate 12 is provided with a first through hole 127, which extends through the first side plate 12 along a first direction and communicates with a portion of the first space 2310. The first through hole 127 is configured to provide a first insulating material in the first space to form a first colloid D1. Optionally, the first colloid D1 is partially located in the first through hole 127.

[0092] In some embodiments, the first insulating material includes a foaming adhesive, which is foamed and cured to form a first colloid D1.

[0093] In some embodiments, the first insulating material includes potting compound, and the first insulating material is cured to form a first colloid D1.

[0094] The second side plate 13 is provided with a second through hole 137. Along the first direction, the second through hole 137 penetrates the second side plate 13 and communicates with a portion of the first space, which facilitates the flow and inspection of the first insulating material. Optionally, a portion of the first colloid D1 is located in the second through hole 137.

[0095] In some embodiments, the projections of the first through hole 127 and the third through hole 1511 overlap along the first direction X, which facilitates the flow of the first insulating material.

[0096] Viewed along the first direction X, both the first through-hole 127 and the second through-hole 137 overlap with the space between the sealing portions 231 of two adjacent battery cells 21. Injecting a first colloid D1 into the housing Q through the first through-hole 127 and / or the second through-hole 137 fills the space between the sealing portions 231 of the two adjacent battery cells 21, improving the thermal conductivity between the battery cell 21 and the housing Q. The second through-hole 137 also facilitates ventilation and heat dissipation of the battery pack 100, thereby improving the heat dissipation capacity of the battery pack 100. The first colloid D1 filling the space between the sealing portions 231 of the two adjacent battery cells 21 helps alleviate the deformation problem of the two adjacent battery cells 21. Injecting the first colloid D1 into the housing Q also helps improve the airtightness of the battery pack 100.

[0097] The first through hole 127 penetrates the first side plate 12 along the first direction X. Viewed along the first direction X, the first through hole 127 overlaps with the space between the sealing portions 231 of two adjacent battery cells 21. Specifically, viewed along the first direction X, the first through hole 127 overlaps with the space between the second sealing portions 2312 of two adjacent battery cells 21. Therefore, a first colloid D1 can be injected into the space between the sealing portions 231 of two adjacent battery cells 21 through the first through hole 127. After injecting the first colloid D1 into the space between the sealing portions 231 of two adjacent battery cells 21, the foam between the sealing portions 231 of the two adjacent battery cells 21 can be removed.

[0098] The second through hole 137 penetrates the second side plate 13 along the first direction X. Viewed along the first direction X, the second through hole 137 overlaps with the space between the sealing portions 231 of two adjacent battery cells 21. Specifically, viewed along the first direction X, the second through hole 137 overlaps with the space between the second sealing portions 2312 of two adjacent battery cells 21. Therefore, the first colloid D1 can also be injected into the space between the sealing portions 231 of two adjacent battery cells 21 through the second through hole 137. Viewed along the first direction X, the first through hole 127 and the second through hole 137 can overlap.

[0099] Of course, the first adhesive D1 can also be injected into the housing Q simultaneously through the first through hole 127 and the second through hole 137, which can improve the dispensing efficiency. Figure 40 , Figure 41 , Figure 42 As shown, in some embodiments, the bracket 150 is provided with a third through hole 1511, which is configured to allow a second insulating material to be injected into the housing Q and cured to form the second colloid D2. Optionally, the second insulating material includes expanding foam. Optionally, the second insulating material includes potting compound.

[0100] The second colloid D2 is injected into the housing Q through the third through-hole 1511. The second colloid D2 fills the accessible gaps within the housing Q, improving its airtightness. The second colloid D2 also enhances the thermal conductivity between the battery module 20 and the housing Q, thereby improving the heat dissipation capacity of the battery pack 100. The presence of the second colloid D2 within the housing Q helps mitigate the problem of battery module 20 movement, thus improving the safety performance of the battery pack 100.

[0101] Along the third direction Z, the third through hole 1511 penetrates the bracket 150 and communicates with the receiving space of the box Q. The second colloid D2 is injected into the box Q through the third through hole 1511 to fill the space inside the box Q.

[0102] The second colloid, D2, can be a colloid with good thermal conductivity. After curing, the second colloid, D2, can also act as a connector within the enclosure Q, thereby improving the installation stability of various structures within the enclosure Q.

[0103] In some embodiments, the amount of the second colloid D2 injected into the housing Q through the third through hole 1511 should not overflow from the third through hole 1511.

[0104] In some embodiments, the bracket 150 is provided with two third through holes 1511, which are arranged at intervals along the second direction Y. When viewed along the third direction Z, the space between the first end plate 80 and the battery module 20 overlaps with one of the two third through holes 1511, and the space between the second end plate 90 and the battery module 20 overlaps with the other of the two third through holes 1511.

[0105] Looking from the third direction Z, the space between the first end plate 80 and the battery module 20 overlaps with a third through hole 1511, and the space between the second end plate 90 and the battery module 20 overlaps with another third through hole 1511. It is possible to fill the space between the first end plate 80 and the battery module 20 and the space between the second end plate 90 and the battery module 20 with glue through the corresponding third through holes 1511, which can improve the efficiency of glue filling and facilitate the uniform distribution of the second glue D2 in the box Q.

[0106] like Figure 1 , Figure 2As shown, the battery pack 100 includes a housing 10, a battery module 20, and a first heat-conducting element 30. The housing 10 is U-shaped and includes a bottom plate 11, a first side plate 12, and a second side plate 13. The first side plate 12 and the second side plate 13 are arranged opposite each other along a first direction X. The bottom plate 11 connects the first side plate 12 and the second side plate 13. The battery module 20 is located between the first side plate 12 and the second side plate 13. The battery module 20 includes multiple battery cells 21. A first gap A1 exists between the first side plate 12 and the battery module 20 along the first direction X. The first heat-conducting element 30 is disposed in the first gap A1, and the battery module 20 and the first side plate 12 are connected through the first heat-conducting element 30. The first side plate 12 and the second side plate 13 are configured to move away from each other under the action of an external force to place the battery module 20 in the housing 10. Optionally, the external force can be applied directly by manual operation or applied manually by means of an external force.

[0107] During the assembly of the battery pack 100, the first side plate 12 and the second side plate 13 move away from each other under the action of external force. The distance between the first side plate 12 and the second side plate 13 gradually increases in the direction away from the bottom plate 11. As a result, the housing 10 forms a larger entrance at the end away from the bottom plate 11, providing more space for the battery module 20 to enter the housing 10. After the external force is removed, the first side plate 12 and the second side plate 13 return to their original positions in the first direction X. As a result, the gaps between the first side plate 12 and the battery module 20 and between the second side plate 13 and the battery module 20 are smaller along the first direction X. This shortens the heat conduction path between the battery module 20 and the first side plate 12 of the housing 10, as well as between the battery module 20 and the second side plate 13, thereby improving the heat dissipation capacity of the battery pack 100. The first heat-conducting component 30 is provided between the first side plate 12 and the battery module 20, which helps to improve the heat exchange efficiency between the battery module 20 and the first side plate 12, thereby further improving the heat dissipation efficiency of the battery pack 100.

[0108] The base plate 11 is connected to the first side plate 12 and the second side plate 13 at its two ends along the first direction X, and the base plate 11, the first side plate 12 and the second side plate 13 together form a U-shaped shell 10. The shell 10 has a second opening 14 and a third opening 15 at its opposite ends along the second direction Y, and a fourth opening 16 at the end of the shell 10 facing away from the base plate 11. The fourth opening 16 and the base plate 11 are arranged opposite each other along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The battery module 20 can enter the shell 10 through the fourth opening 16. When an external force P is applied to the first side plate 12 and the second side plate 13, the fourth opening 16 increases along the first direction X, facilitating the entry of the battery module 20 into the shell 10 through the fourth opening 16.

[0109] The shell 10 can be made of various materials, such as steel, copper, aluminum, etc. This application does not limit the material.

[0110] like Figure 3 As shown, the battery module 20 includes multiple stacked battery cells 21, where "multiple" refers to two or more. The multiple battery cells 21 can be stacked in any direction. For example, the stacking direction of the multiple battery cells 21 can be perpendicular to the direction in which the first side plate 12 and the second side plate 13 of the housing 10 are arranged opposite each other. For instance, the multiple battery cells 21 can be stacked along a second direction Y or a third direction Z. Figure 3 As shown, in this embodiment, multiple battery cells 21 are stacked along the third direction Z to facilitate the entry of the battery module 20 into the housing 10. In other embodiments, multiple battery cells 21 may also be stacked along the first direction X.

[0111] A first buffer 22 can be provided between two adjacent battery cells 21. The first buffer 22 can be foam, rubber pads, etc. Specifically, a first buffer 22 can be provided between every two adjacent battery cells 21 to provide buffer space for cell expansion and improve the battery pack 100's resistance to external impacts. Alternatively, the first buffer 22 can be provided between some of the adjacent battery cells 21, reducing the number of first buffer 22s and improving the energy density and manufacturing cost of the battery pack 100. Along the stacking direction of the multiple battery cells 21, a first buffer 22 can also be provided on the side of the end battery cell 21 facing away from its adjacent battery cell 21, providing protection for the end battery cell 21.

[0112] The battery cell 21 can be a pouch cell or a steel-cased cell. Multiple cells 21 are electrically connected. The multiple cells 21 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple cells 21 are connected in both parallel and series.

[0113] like Figure 4As shown, the battery cell 21 includes a packaging bag 23, an electrode assembly (not shown), and tabs 25 connected to the electrode assembly. The electrode assembly includes a separator (not shown), a positive electrode (not shown), and a negative electrode (not shown), both with opposite polarities. The positive electrode includes a positive active material layer (not shown) and a positive current collector (not shown). The negative electrode includes a negative active material layer (not shown) and a negative current collector (not shown). Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. The tabs 25 include a positive tab 24a and a negative tab 24b. The positive tab 24a is conductively connected to the current collector of the positive electrode, and the negative tab 24b is conductively connected to the current collector of the negative electrode.

[0114] like Figure 4 As shown, the packaging bag 23 includes a sealing part 231 and a packaging body 232. The sealing part 231 is connected to three adjacent edges of the packaging body 232. The sealing part 231 includes a first sealing part 2311, a second sealing part 2312, and a third sealing part 2313 connected in sequence. The first sealing part 2311 and the third sealing part 2313 are disposed opposite to each other, and the second sealing part 2312 is connected between the first sealing part 2311 and the third sealing part 2313.

[0115] The active material portion of the positive electrode, the active material portion of the negative electrode, and at least a portion of the separator form the main body of the electrode assembly. The main body is housed within a packaging body 232. Positive electrode tabs 24a and 24b extend from the same end of the main body to a sealing portion 231, and extend from the sealing portion 231 out of the packaging bag 23. For example, positive electrode tabs 24a and 24b extend from the second sealing portion 2312 out of the packaging bag 23. In this embodiment, the first sealing portion 2311 and the third sealing portion 2313 are arranged opposite each other along a first direction X. The first sealing portion 2311 is disposed near the first side plate 12, and the third sealing portion 2313 is disposed near the second side plate 13.

[0116] A first space 2310 is formed between the sealing portions 231 of two adjacent cells 21. Optionally, foam can be provided in the first space 2310.

[0117] In some embodiments, the battery module 20 further includes a first circuit board 26. Figure 2As shown in the diagram, the positive tab 24a and negative tab 24b of the battery cell 21 extend from the packaging bag 23 and are electrically connected to the first circuit board 26. Multiple battery cells 21 are connected in series, parallel, or mixed. The first circuit board 26 has a total positive electrode 261 and a total negative electrode 262 formed on the electrode assembly, and the battery module 20 can be charged and discharged through the total positive electrode 261 and the total negative electrode 262.

[0118] In one embodiment, the first circuit board 26 includes a printed circuit board (PCB). Optionally, the first circuit board 26 is a flexible printed circuit board (FPC).

[0119] like Figure 5 , Figure 6 As shown, in some embodiments, the battery module 20 further includes a third heat conductor 27, a portion of which is disposed between two adjacent cells 21. Along the first direction X, a portion of the third heat conductor 27 extends into the space between the first side plate 12 and the plurality of cells 21, and a portion of the third heat conductor 27 extends into the space between the second side plate 13 and the plurality of cells 21.

[0120] The third heat-conducting component 27 facilitates the rapid dissipation of heat from the cell 21, thereby improving the heat dissipation capacity of the battery pack 100.

[0121] Combined with reference Figure 5 , Figure 6 , Figure 7 The third heat-conducting component 27 includes a bottom wall 271 and a side wall 272. One end of the side wall 272 is connected to the edge of the bottom wall 271. The bottom wall 271 and the side wall 272 together form a receiving cavity for the packaging body 232 that accommodates the battery cell 21. The side wall 272 has a notch 273 for the receiving cavity to extend from the sealing part 231 and the tab 25.

[0122] The third heat-conducting component 27 can be made of metals such as aluminum or copper. Of course, the third heat-conducting component 27 can also be made of non-metallic materials such as rubber.

[0123] The sidewall 272 includes a first sidewall 2721, a second sidewall 2722, and a third sidewall 2723, which are respectively connected to three adjacent edges of the bottom wall 271. The bottom wall 271 is located between two adjacent cells 21. The first sidewall 2721 and the second sidewall 2722 are arranged opposite each other along a first direction X. Along the first direction X, the first sidewall 2721 is located between the cell 21 and the first side plate 12, and the second sidewall 2722 is located between the cell 21 and the second side plate 13. The third sidewall 2723 is connected to one edge of the bottom wall 271 located in a second direction Y, and is located between the second end plate 90 and the cell 21. A fifth opening 274 is formed at the end of the sidewall 272 facing away from the bottom wall 271.

[0124] A third heat-conducting element 27 can be provided between every two adjacent cells 21, which facilitates the rapid dissipation of heat from each cell 21. Alternatively, the third heat-conducting element 27 can be provided between some of the two adjacent cells 21, which can reduce the number of third heat-conducting elements 27, save costs, and increase the energy density of the battery pack 100.

[0125] The battery module 20 may include multiple third heat-conducting components 27, which are stacked along the stacking direction of the multiple battery cells 21. For example... Figure 5 As shown, the fifth openings 274 of two adjacent third heat-conducting elements 27 are arranged opposite each other, jointly defining a subspace for accommodating the battery cell 21. One or more battery cells 21 can be disposed within each subspace. Two adjacent third heat-conducting elements 27 and the battery cell 21 located between them can collectively form a battery cell 21 unit. A second buffer 28 can be disposed between two adjacent battery cell 21 units. The second buffer 28 can be foam, rubber pads, etc. The placement of the second buffer 28 provides space for the expansion of the battery cell 21 unit and improves the battery pack 100's resistance to external impacts.

[0126] In other embodiments, the battery module 20 may also not include the third heat-conducting component 27 (e.g., Figure 3 (as shown in the image).

[0127] like Figures 8-11 As shown, in an embodiment where the battery module 20 does not have a third heat-conducting component 27, the first gap A1 formed between the first side plate 12 and the battery module 20 is the distance between the inner surface 121 of the first side plate and the first sealing portion 2311 of the cell 21. The first heat-conducting component 30 is disposed within the first gap A1.

[0128] In embodiments where the battery module 20 does not have a third heat-conducting component 27, the length of the first gap A1 along the first direction X is H1, and H1 is 0.05mm to 2.5mm. For example, H1 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, etc.

[0129] Along the first direction X, the length of the first gap A1 is 0.05mm to 2.5mm, so the heat conduction path between the battery module 20 and the first side plate 12 is shorter, which makes the heat conduction path from the battery module 20 to the first side plate 12 smaller, thereby improving the heat dissipation capacity of the battery pack 100.

[0130] Furthermore, H1 can be located between 0.1mm and 1.9mm. For example, H1 can be 0.1mm, 0.3mm, 0.6mm, 0.9mm, 1.3mm, 1.6mm, 1.9mm, etc. With the length of the first gap A1 along the first direction X being between 0.1mm and 1.9mm, the heat conduction path between the battery module 20 and the first side plate 12 is further shortened, resulting in a smaller heat conduction path from the battery module 20 to the first side plate 12, thereby further improving the heat dissipation capacity of the battery pack 100.

[0131] Furthermore, H1 can be located between 0.1mm and 1.4mm. For example, H1 can be 0.2mm, 0.7mm, 0.8mm, 1.2mm, 1.4mm, etc. With the length of the first gap A1 along the first direction X being between 0.1mm and 1.4mm, the heat conduction path between the battery module 20 and the first side plate 12 is further shortened, making the heat conduction path from the battery module 20 to the first side plate 12 smaller, thus improving the heat dissipation capacity of the battery pack 100.

[0132] like Figures 12-15 As shown, in an embodiment where the battery module 20 is provided with a third heat-conducting component 27, the first gap A1 is the distance between the inner surface 121 of the first side plate and the first side wall 2721.

[0133] In an embodiment where the battery module 20 is provided with a third heat-conducting element 27, the length of the first gap A1 along the first direction X is H2, and H2 is 0.05mm to 2.5mm. For example, H2 is 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, etc.

[0134] Furthermore, if H2 is 0.05mm to 1.5mm, the heat conduction path between the battery module 20 with the third heat-conducting element 27 and the first side plate 12 is shorter, resulting in a smaller heat conduction path from the battery module 20 to the first side plate 12, thereby improving the heat dissipation capacity of the battery pack 100. For example, H2 can be 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, etc.

[0135] Furthermore, if H2 is 0.1mm to 1.1mm, the heat conduction path between the battery module 20 with the third heat-conducting element 27 and the first side plate 12 is further shortened, making the heat conduction path from the battery module 20 to the first side plate 12 even smaller, thereby further improving the heat dissipation capacity of the battery pack 100. For example, H2 can be 0.1mm, 0.15mm, 0.25mm, 0.35mm, 0.45mm, 0.55mm, 0.65mm, 0.75mm, 0.85mm, 0.95mm, 1.1mm, etc.

[0136] Furthermore, if H2 is between 0.1mm and 0.6mm, the heat conduction path between the battery module 20 and the first side plate 12 is further shortened, resulting in a smaller heat conduction path from the battery module 20 to the first side plate 12, thus improving the heat dissipation capacity of the battery pack 100. For example, H2 can be 0.1mm, 0.13mm, 0.16mm, 0.19mm, 0.22mm, 0.28mm, 0.32mm, 0.38mm, 0.42mm, 0.48mm, 0.52mm, 0.58mm, 0.6mm, etc.

[0137] The first heat-conducting element 30 is disposed between the first side plate 12 and the battery module 20. Along the first direction X, the first heat-conducting element 30 can contact the first side plate 12 and the battery module 20. Heat is conducted between the battery module 20 and the first side plate 12 through the first heat-conducting element 30, which helps improve the heat dissipation efficiency of the battery pack 100. The first heat-conducting element 30, being disposed between the first side plate 12 and the battery module 20, occupies the space between them, making the internal structure of the housing 10 more compact. This reduces the risk of movement of the battery module 20 and other internal structures of the housing 10, thereby improving the safety performance of the battery pack 100.

[0138] The first thermally conductive element 30 can be a colloid with good thermal conductivity, a metal component with good thermal conductivity, etc. In embodiments where the first thermally conductive element 30 is a thermally conductive colloid, the first thermally conductive element 30 can be formed by curing the adhesive applied to the surface of the first side plate 12 facing the battery module 20 and / or the side of the battery module 20 facing the first side plate 12, which is beneficial to improving the stability of the internal structure of the housing 10. The first thermally conductive element 30 can also be a solid thermally conductive strip, a metal component, etc.

[0139] like Figure 2 As shown, in some embodiments, there is a second gap A2 between the second side plate 13 and the battery module 20; the battery pack 100 also includes a second heat-conducting element 50, which is disposed in the second gap A2.

[0140] The second heat-conducting component 50 is provided between the second side plate 13 and the battery module 20, which helps to improve the heat exchange efficiency between the battery module 20 and the second side plate 13, thereby further improving the heat dissipation efficiency of the battery pack 100.

[0141] like Figure 16 , Figure 17 As shown, in an embodiment where the battery module 20 does not have a third heat-conducting component 27, the second gap A2 formed between the second side plate 13 and the battery module 20 is the distance between the inner surface 131 of the second side plate and the third sealing portion 2313 of the cell 21. The second heat-conducting component 50 is disposed within the second gap A2.

[0142] In embodiments where the battery module 20 does not have a third heat-conducting component 27, the length of the second gap A2 along the first direction X is L1, and L1 is 0.05mm to 2.5mm. For example, L1 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, etc.

[0143] Along the first direction X, the length of the second gap A2 is 0.05mm to 2.5mm. Therefore, the heat conduction path between the battery module 20 and the second side plate 13 is shorter, which makes the heat conduction path from the battery module 20 to the second side plate 13 smaller, thereby improving the heat dissipation capacity of the battery pack 100.

[0144] Furthermore, L1 can be located between 0.1mm and 1.9mm. For example, L1 can be 0.1mm, 0.3mm, 0.6mm, 0.9mm, 1.3mm, 1.6mm, 1.9mm, etc. With the length of the second gap A2 along the first direction X being between 0.1mm and 1.9mm, the heat conduction path between the battery module 20 and the second side plate 13 is further shortened, resulting in a smaller heat conduction path from the battery module 20 to the second side plate 13, thereby further improving the heat dissipation capacity of the battery pack 100.

[0145] Furthermore, L1 can be located between 0.1mm and 1.4mm. For example, L1 can be 0.2mm, 0.7mm, 0.8mm, 1.2mm, 1.4mm, etc. With the length of the second gap A2 along the first direction X being between 0.1mm and 1.4mm, the heat conduction path between the battery module 20 and the second side plate 13 is further shortened, making the heat conduction path from the battery module 20 to the second side plate 13 smaller, thus improving the heat dissipation capacity of the battery pack 100.

[0146] like Figure 18 , Figure 19 As shown, in an embodiment where the battery module 20 is provided with a third heat-conducting component 27, the second gap A2 formed between the second side plate 13 and the battery module 20 is the distance between the inner surface 131 of the second side plate and the second sidewall 2722 of the third heat-conducting component 27.

[0147] In an embodiment where the battery module 20 is provided with a third heat-conducting element 27, the length of the second gap A2 along the first direction X is L2, and L2 is 0.05mm to 2.5mm. For example, L2 is 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, etc.

[0148] Furthermore, if L2 is 0.05mm to 1.5mm, the heat conduction path between the battery module 20 with the third heat-conducting element 27 and the second side plate 13 is shorter, resulting in a smaller heat conduction path from the battery module 20 to the second side plate 13, thereby improving the heat dissipation capacity of the battery pack 100. For example, L2 can be 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, etc.

[0149] Furthermore, if L2 is 0.1mm to 1.1mm, the heat conduction path between the battery module 20 with the third heat-conducting element 27 and the second side plate 13 is further shortened, making the heat conduction path from the battery module 20 to the second side plate 13 even smaller, thereby further improving the heat dissipation capacity of the battery pack 100. For example, H2 can be 0.1mm, 0.15mm, 0.25mm, 0.35mm, 0.45mm, 0.55mm, 0.65mm, 0.75mm, 0.85mm, 0.95mm, 1.1mm, etc.

[0150] Furthermore, if L2 is 0.1mm to 0.6mm, the heat conduction path between the battery module 20 and the second side plate 13 is further shortened, resulting in a smaller heat conduction path from the battery module 20 to the second side plate 13, thus improving the heat dissipation capacity of the battery pack 100. For example, H2 can be 0.1mm, 0.13mm, 0.16mm, 0.19mm, 0.22mm, 0.28mm, 0.32mm, 0.38mm, 0.42mm, 0.48mm, 0.52mm, 0.58mm, 0.6mm, etc.

[0151] The second heat-conducting element 50 is disposed between the second side plate 13 and the battery module 20. Along the first direction X, the second heat-conducting element 50 can contact the second side plate 13 and the battery module 20. Heat is conducted between the battery module 20 and the second side plate 13 through the second heat-conducting element 50, which helps improve the heat dissipation efficiency of the battery pack 100. The second heat-conducting element 50's placement between the second side plate 13 and the battery module 20 utilizes the space between them, making the internal structure of the housing 10 more compact. This reduces the risk of movement of the battery module 20 and other internal structures of the housing 10, thereby improving the safety performance of the battery pack 100. The first heat-conducting element 30 and the second heat-conducting element 50 can jointly restrict the movement of the battery module 20 within the housing 10.

[0152] The second thermally conductive element 50 can be a colloid or a metal component with good thermal conductivity. In embodiments where the second thermally conductive element 50 is a thermally conductive adhesive, it can be formed by curing a liquid adhesive applied to the surface of the second side plate 13 facing the battery module 20 and / or the side of the battery module 20 facing the second side plate 13, which helps improve the stability of the internal structure of the housing 10. The second thermally conductive element 50 can also be a solid thermally conductive adhesive strip or a metal component.

[0153] In some embodiments, the base plate 11, the first side plate 12, and the second side plate 13 are integrally formed.

[0154] The integral molding of the base plate 11, the first side plate 12, and the second side plate 13 means that the base plate 11, the first side plate 12, and the second side plate 13 are formed by an integral molding method, such as stamping, casting, injection molding, bending, etc. The integral molding of the base plate 11 and the two side plates makes the shell 10 easier to process and shape.

[0155] In other embodiments, the base plate 11, the first side plate 12, and the second side plate 13 can also be separate components, which are then connected to form a U-shaped housing 10. For example, the base plate 11, the first side plate 12, and the second side plate 13 can be welded together, bonded together, or bolted together, etc., which facilitates the selection of appropriate first side plate 12, second side plate 13, and base plate 11 according to actual working conditions. When the base plate 11, the first side plate 12, and the second side plate 13 are detachably connected, it also facilitates the maintenance and replacement of the base plate 11, the first side plate 12, and the second side plate 13.

[0156] In some embodiments, the thickness of the first side plate 12 along the first direction X is 0.5mm-4mm, which helps to strengthen the protection of the battery module 20. Optionally, the thickness of the first side plate 12 along the first direction X is 1mm-3mm, which facilitates the assembly of the battery module 20. Optionally, the thickness of the first side plate 12 along the first direction X is 0.5mm-1.8mm, which further facilitates the assembly of the battery module 20 and reduces the weight of the battery pack 100.

[0157] In some embodiments, the thickness of the second side plate 13 along the first direction X is 0.5-4 mm, which helps to strengthen the protection of the battery module 20. Optionally, the thickness of the second side plate 13 along the first direction X is 1-3 mm, which facilitates the assembly of the battery module 20. Optionally, the thickness of the second side plate 13 along the first direction X is 0.5-1.8 mm, which further facilitates the assembly of the battery module 20 and reduces the weight of the battery pack 100.

[0158] like Figure 20 , Figure 21 As shown, in some embodiments, the end of the housing 10 in the second direction Y is provided with a first reinforcing member 60. The first reinforcing member 60 can increase the strength and thickness of the end region of the housing 10 in the second direction Y, thereby increasing the connection area and sealing area between the first end plate 80 and one end of the housing 10 in the second direction Y, and improving the connection strength and sealing performance.

[0159] The first reinforcing member 60 is disposed on the outer surface of one end of the housing 10 along the second direction Y. The first reinforcing member 60 covers a portion of the first side plate 12 and a portion of the second side plate 13. The end of the first reinforcing member 60 along the second direction Y may be flush with the end face of the housing 10 along the third direction Z.

[0160] The first reinforcing member 60 can be fixedly connected to the housing 10, such as by welding or bonding. Alternatively, the first reinforcing member 60 can be detachably connected to the housing 10, such as by bolts or screws. The material of the first reinforcing member 60 can be the same as or different from that of the housing 10.

[0161] Please continue to refer to Figure 20 , Figure 21 In some embodiments, the first reinforcing member 60 is U-shaped and is fixedly connected to the outer surface of the housing 10. The first reinforcing member 60 includes a first reinforcing portion 61, a second reinforcing portion 62, and a third reinforcing portion 63. The first reinforcing portion 61 and the second reinforcing portion 62 are connected through the third reinforcing portion 63 to form the U-shaped first reinforcing member 60. The first reinforcing portion 61 is fixedly connected to the outer surface 122 of the first side plate, for example, by welding. The second reinforcing portion 62 is fixedly connected to the outer surface 132 of the second side plate, for example, by welding. The third reinforcing portion 63 is fixedly connected to the outer surface of the base plate 11, for example, by welding.

[0162] In some embodiments, a second reinforcing member 70 is provided at the other end of the housing 10 in the second direction Y, and the second reinforcing member 70 is arranged at a distance from the first reinforcing member 60 along the second direction Y. The second reinforcing member 70 can increase the strength and thickness of the end region of the housing 10 in the second direction Y, thereby increasing the connection area and sealing area between the first end plate 80 and one end of the housing 10 along the second direction Y, and improving the connection strength and sealing performance.

[0163] The second reinforcing member 70 is disposed on the outer surface of the other end of the housing 10 along the second direction Y. The second reinforcing member 70 covers a portion of the first side plate 12 and a portion of the second side plate 13. The end of the second reinforcing member 70 opposite to the first reinforcing member 60 along the second direction Y can be flush with the end face of the housing 10 along the third direction Z.

[0164] The second reinforcing member 70 can be fixedly connected to the housing 10, such as by welding or bonding. Alternatively, the second reinforcing member 70 can be detachably connected to the housing 10, such as by bolts or screws. The material of the second reinforcing member 70 can be the same as or different from that of the housing 10.

[0165] Please continue to refer to Figure 20 , Figure 21In some embodiments, the second reinforcing member 70 is U-shaped and is fixedly connected to the outer surface of the housing 10. The second reinforcing member 70 includes a fourth reinforcing portion 71, a fifth reinforcing portion 72, and a sixth reinforcing portion 73. The fourth reinforcing portion 71 and the fifth reinforcing portion 72 are connected through the sixth reinforcing portion 73 to form the U-shaped second reinforcing member 70. The fourth reinforcing portion 71 is fixedly connected to the outer surface 122 of the first side plate, for example, by welding. The fifth reinforcing portion 72 is fixedly connected to the outer surface 132 of the second side plate, for example, by welding. The sixth reinforcing portion 73 is fixedly connected to the outer surface of the base plate 11, for example, by welding.

[0166] The outer surface 122 of the first side plate is the surface of the first side plate 12 that faces away from the battery module 20 along the first direction X, and the outer surface 122 and the inner surface 121 of the first side plate are opposite to each other. The outer surface 132 of the second side plate is the surface of the second side plate 13 that faces away from the battery module 20 along the first direction X, and the outer surface 132 and the inner surface 131 of the second side plate are opposite to each other. The outer surface of the bottom plate 11 is the surface of the bottom plate 11 that faces away from the battery module 20 along the third direction Z, and the outer surface and the inner surface of the bottom plate 11 are opposite to each other.

[0167] Combined with reference Figure 1 , Figure 2 , Figure 22 In some embodiments, the battery pack 100 further includes a first end plate 80 and a second end plate 90, which are arranged along a second direction Y; a first side plate 12 and a second side plate 13 are both fixedly connected to the first end plate 80 and the first side plate 12 and the second side plate 13 are both fixedly connected to the second end plate 90; the first end plate 80, the second end plate 90 and the housing 10 form a box Q with a first opening Q1, the first opening Q1 being opposite to the bottom plate 11, and the battery module 20 being housed in the box Q.

[0168] The first end plate 80, the second end plate 90, and the housing 10 together form a box Q with a first opening Q1. The box Q provides better protection for the battery module 20, which helps improve the safety performance of the battery pack 100 and reduces the risk of structural damage within the box Q. The first side plate 12 and the second side plate 13 are both fixedly connected to the first end plate 80 and the second end plate 90, which helps improve the structural strength of the box Q. The first end plate 80 and the second end plate 90 also restrain the first side plate 12 and the second side plate 13, mitigating the problem of the first side wall 2721 and the second side wall 2722 deforming in directions away from each other.

[0169] The material of the first end plate 80 can be the same as or different from the material of the housing 10. The material of the second end plate 90 can be the same as or different from the material of the housing 10.

[0170] Both the first side plate 12 and the second side plate 13 are fixedly connected to the first end plate 80, meaning that there is a stable connection between the first side plate 12 and the first end plate 80, and a stable connection between the second side plate 13 and the first end plate 80. The first side plate 12 and the second side plate 13 can both be detachably connected to the first end plate 80, such as by bolts, screws, or snap-fit ​​connections, facilitating maintenance and replacement of the first side plate 12 and the first end plate 80. Taking a bolted connection as an example... Figure 22 As shown, the first end plate 80 is provided with a plurality of first threaded holes 81, and the housing 10 is provided with second threaded holes 123. Some of the first threaded holes 81 and the second threaded holes 123 are arranged coaxially along the first direction X, and are connected to the first threaded holes 81 and the second threaded holes 123 by bolt threads, thereby achieving a fixed connection between the first end plate 80 and the first side plate 12. The housing 10 is also provided with a third threaded hole 133, some of the first threaded holes 81 and the third threaded holes 133 are arranged coaxially along the first direction X, and are connected to the first threaded holes 81 and the third threaded holes 133 by bolt threads, thereby achieving a fixed connection between the first end plate 80 and the second side plate 13.

[0171] The second threaded hole 123 can be directly or indirectly disposed on the first side plate 12. In an embodiment where the first reinforcing member 60 is provided at the end of the housing 10 corresponding to the first end plate 80, the second threaded hole 123 can be disposed on the first reinforcing part 61 of the first reinforcing member 60, thereby realizing that the second threaded hole 123 is indirectly disposed on the first side plate 12. After the first threaded hole 81 and the second threaded hole 123 are connected by bolts, the first reinforcing member 60 and the first end plate 80 are also fixedly connected.

[0172] The third threaded hole 133 can be directly or indirectly disposed on the second side plate 13. In an embodiment where the first reinforcing member 60 is provided at the end of the housing 10 corresponding to the first end plate 80, the third threaded hole 133 can be disposed on the second reinforcing part 62 of the first reinforcing member 60, thereby realizing that the third threaded hole 133 is indirectly disposed on the second side plate 13. After the first threaded hole 81 and the third threaded hole 133 are connected by bolts, the first reinforcing member 60 and the first end plate 80 are also fixedly connected.

[0173] Both the first side plate 12 and the second side plate 13 are fixedly connected to the second end plate 90, meaning there is a stable connection between the first side plate 12 and the second end plate 90, and a stable connection between the second side plate 13 and the second end plate 90. The first side plate 12 and the second side plate 13 can both be detachably connected to the second end plate 90, such as by bolts, screws, or snap-fit ​​connections, facilitating the maintenance and replacement of both the first side plate 12 and the second end plate 90. Taking a bolted connection as an example... Figure 22 As shown, the second end plate 90 is provided with multiple fourth threaded holes 91, and the housing 10 is provided with fifth threaded holes 124. Some of the fourth threaded holes 91 and fifth threaded holes 124 are arranged coaxially along the first direction X, and are connected to the fourth threaded holes 91 and fifth threaded holes 124 by bolt threads, thereby achieving a fixed connection between the second end plate 90 and the first side plate 12. The housing 10 is provided with a sixth threaded hole 134, and some of the fourth threaded holes 91 and sixth threaded holes 134 are arranged coaxially along the first direction X, and are connected to the fourth threaded holes 91 and sixth threaded holes 134 by bolt threads, thereby achieving a fixed connection between the second end plate 90 and the second side plate 13.

[0174] The fifth threaded hole 124 can be directly or indirectly disposed on the first side plate 12. In an embodiment where a second reinforcing member 70 is provided at one end of the housing 10 corresponding to the second end plate 90, the fifth threaded hole 124 can be disposed on the fourth reinforcing part 71 of the second reinforcing member 70, thereby realizing that the fifth threaded hole 124 is indirectly disposed on the first side plate 12. After the fifth threaded hole 124 and the fourth threaded hole 91 are connected by bolts, the second reinforcing member 70 and the second end plate 90 are also fixedly connected.

[0175] The sixth threaded hole 134 can be directly or indirectly disposed on the second side plate 13. In an embodiment where the second reinforcing member 70 is provided at the end of the housing 10 corresponding to the second end plate 90, the sixth threaded hole 134 can be disposed on the fifth reinforcing part 72 of the second reinforcing member 70, thereby realizing that the sixth threaded hole 134 is indirectly disposed on the second side plate 13. After the sixth threaded hole 134 and the fourth threaded hole 91 are connected by bolts, the second reinforcing member 70 and the second end plate 90 are also fixedly connected.

[0176] The fourth opening 16 of the housing 10 is part of the first opening Q1 of the box Q.

[0177] like Figures 22-26As shown, in an embodiment where the housing 10 has a first reinforcing member 60 and a second reinforcing member 70 at both ends along the second direction Y, the first reinforcing member 60 is provided with a first slot 64, and the first end plate 80 includes a first end plate body 82 and a first engaging portion 83. The first engaging portion 83 is disposed at the edge of the first end plate body 82 and engages with the first slot 64. The first engaging portion 83 of the first end plate 80 engages with the first slot 64 of the first reinforcing member 60 to ensure accurate positioning of the first end plate 80 and the housing 10, thereby improving the stability of the connection between the first end plate 80 and the housing 10.

[0178] In some embodiments, along the third direction Z, the second threaded hole 123 and the third threaded hole 133 are close to the first opening Q1 relative to the first slot 64, which is beneficial to the restoration of the first side plate 12 and the second side plate 13.

[0179] A first slot 64 is disposed on the surface of the first reinforcing member 60 facing away from the housing 10. The first slot 64 can extend to the end face of the first reinforcing member 60 that is flush with the housing 10 along the second direction Y, so as to form a first groove on the end face of the first reinforcing member 60 along the second direction Y. Figure 24 As shown, both the surface of the first reinforcing part 61 facing away from the first side plate 12 and the surface of the second reinforcing part 62 facing away from the second side plate 13 are provided with first slots 64. A first angle α1 exists between the first slots 64 and the second direction. Figure 25 As shown in the figure, the first angle α1 is an acute angle so that the first snap-fit ​​part 83 and the first snap-fit ​​groove 64 can be more stable after they are engaged.

[0180] Each first reinforcing part 61 is provided with a plurality of first slots 64 at intervals along the third direction Z, and each second reinforcing part 62 is provided with a plurality of first slots 64 at intervals along the third direction Z. Of course, a first slot 64 may also be provided on the first reinforcing part 61, and a first slot 64 may also be provided on the second reinforcing part 62.

[0181] The surface of the third reinforcing part 63 facing away from the base plate 11 may be provided with a first slot 64, or the first slot 64 may not be provided.

[0182] In some embodiments, the first reinforcing member 60 is used to position the first slot 64. Before the first slot 64 is formed, its thickness in the direction away from the battery module 20 is greater than the thickness of other positions of the first reinforcing member 60 in the direction away from the battery module 20. This compensates for the reduction in thickness of the first reinforcing member 60 at the corresponding position caused by forming the first slot 64, thus alleviating the problem that the formation of the first slot 64 reduces the strength of the first reinforcing member 60. Of course, the first reinforcing member 60 can also be a structure of uniform thickness.

[0183] like Figures 22-26As shown, in an embodiment where the housing 10 has a first reinforcing member 60 and a second reinforcing member 70 at both ends along the second direction Y, the second reinforcing member 70 is provided with a second slot 74. The second end plate 90 includes a second end plate body 92 and a second engaging portion 93. The second engaging portion 93 is disposed at the edge of the second end plate body 92 and engages with the second slot 74. The second engaging portion 93 of the second end plate 90 engages with the second slot 74 of the second reinforcing member 70, so that the second end plate 90 and the housing 10 are accurately positioned, thereby improving the connection stability between the second end plate 90 and the housing 10.

[0184] In some embodiments, along the third direction Z, the fifth threaded hole 124 and the sixth threaded hole 134 are closer to the first opening Q1 relative to the second slot 74, which is beneficial for the restoration of the first side plate 12 and the second side plate 13.

[0185] like Figure 23 , Figure 26 As shown, the second slot 74 is disposed on the surface of the second reinforcing member 70 facing away from the housing 10. The second slot 74 can extend to the end face of the second reinforcing member 70 flush with the housing 10 along the second direction Y, so as to form a second groove on the end face of the second reinforcing member 70 along the second direction Y. The surface of the fourth reinforcing part 71 facing away from the first side plate 12 and the surface of the fifth reinforcing part 72 facing away from the second side plate 13 are both provided with the second slot 74. There is a second angle α2 between the second slot 74 and the second direction Y. Figure 26 As shown in the figure, the second angle α2 is an obtuse angle so that the second snap-fit ​​part 93 and the second snap-fit ​​groove 74 can be more secure after they are engaged.

[0186] Each fourth reinforcing part 71 is provided with a plurality of second slots 74 at intervals along the third direction Z, and each fifth reinforcing part 72 is provided with a plurality of second slots 74 at intervals along the third direction Z. Of course, a second slot 74 may also be provided on the fourth reinforcing part 71, and a second slot 74 may also be provided on the fifth reinforcing part 72.

[0187] The surface of the sixth reinforcing part 73 facing away from the base plate 11 may or may not have a second slot 74.

[0188] Similar to the first reinforcing member 60, in some embodiments, the second reinforcing member 70 is used to position the second slot 74. Before the second slot 74 is formed, its thickness along the direction away from the battery module 20 is greater than the thickness of other positions of the second reinforcing member 70 along the direction away from the battery module 20. This compensates for the reduction in thickness of the second reinforcing member 70 at the corresponding position caused by the second slot 74, thus mitigating the problem of the second slot 74 reducing the strength of the second reinforcing member 70. Of course, the second reinforcing member 70 can also be a structure of uniform thickness.

[0189] like Figure 22 As shown, the first end plate body 82 is the portion of the first end plate 80 that is opposite to the housing 10 in the second direction Y. The first end plate body 82 covers the second opening 14 of the housing 10 along the second direction Y. The first snap-fit ​​part 83 and the first end plate body 82 can be integrally formed or can be separately set and connected as a whole structure. The first snap-fit ​​part 83 can enter the first slot 64 from the first slot located on the end face of the first reinforcing member 60 along the second direction Y. The first snap-fit ​​part 83 can be partially snapped into the first slot 64 or fully snapped into the first slot 64. Along the second direction Y, the side of the first end plate body 82 facing away from the battery module 20 has a first fin 84, which is beneficial to improving the heat dissipation efficiency from the first end plate 80. The side of the first end plate body 82 facing the battery module 20 is flat, which facilitates the assembly of the internal structure of the battery pack 100.

[0190] The second end plate body 92 is the portion of the second end plate 90 that is opposite to the housing 10 in the second direction Y. The second end plate body 92 covers the third opening 15 of the housing 10 along the second direction Y. The second snap-fit ​​part 93 and the second end plate body 92 can be integrally formed or can be separately set and connected as a whole structure. The second snap-fit ​​part 93 can enter the second slot 74 from the second slot 74 located at the second groove on the end face of the second reinforcing member 70 along the second direction Y. The second snap-fit ​​part 93 can be partially snapped into the second slot 74 or fully snapped into the second slot 74. Along the second direction Y, the side of the second end plate body 92 facing away from the battery module 20 has a second fin 94, which is beneficial to improving the heat dissipation efficiency from the second end plate 90. The side of the second end plate body 92 facing the battery module 20 is flat, which facilitates the assembly of the internal structure of the battery pack 100.

[0191] like Figure 27 , Figure 28 As shown, in some embodiments, the first latching portion 83 includes a first limiting plate 831 and a first protrusion 832. The first limiting plate 831 is connected to the edge of the first end plate body 82 and is located on the side of the first reinforcing member 60 away from the battery module 20 along the first direction X. The first protrusion 832 protrudes from the surface of the first limiting plate 831 facing the first reinforcing member 60 and is latched in the first slot 64.

[0192] The first limiting plate 831 is connected to the edge of the first end plate body 82 and is located on the side of the first reinforcing member 60 away from the battery module 20 along the first direction X. It can restrict the relative movement of the housing 10 and the first end plate 80 in the first direction X. The first protrusion 832 protrudes from the surface of the first limiting plate 831 facing the first reinforcing member 60 and is held in the first slot 64. It can restrict the first end plate 80 from detaching from the housing 10, thereby improving the relative stability of the first end plate 80 and the housing 10.

[0193] One end of the first limiting plate 831 along the second direction Y is connected to the first end plate body 82, and the other end extends to the side of the first reinforcing member 60 away from the battery module 20. For example, the side of the first reinforcing member 61 away from the battery module 20 is provided with a first slot 64, and the first limiting plate 83 of the first engaging part 83 corresponding to the first slot 64 on the first reinforcing member 61 extends to the side of the first reinforcing member 61 away from the battery module 20.

[0194] When the first protrusion 832 is engaged in the first slot 64, the surface of the first limiting plate 831 facing the first reinforcing member 60 can contact the surface of the first reinforcing member 60 away from the battery module 20, or a gap can be formed.

[0195] The drawing of the second latching part 93 can be compared with the drawing of the first latching part 83. The second latching part 93 includes a second limiting plate (not shown in the figure) and a second protrusion (not shown in the figure). The second limiting plate 931 is connected to the edge of the second end plate body 92 and is located on the side of the second reinforcing member 70 away from the battery module 20 along the first direction X. The second protrusion protrudes from the surface of the second limiting plate facing the second reinforcing member 70 and is held in the second slot 74. The second limiting plate 931 is connected to the edge of the second end plate body 92 and is located on the side of the second reinforcing member 70 away from the battery module 20 along the first direction X, which can restrict the relative movement of the housing 10 and the second end plate 90 in the first direction X. The second protrusion protrudes from the surface of the second limiting plate 931 facing the second reinforcing member 70 and is held in the second slot 74, which can restrict the second end plate 90 from detaching from the housing 10, thereby improving the relative stability of the second end plate 90 and the housing 10.

[0196] One end of the second limiting plate 931 along the second direction Y is connected to the second end plate body 92, and the other end extends to the side of the second reinforcing member 70 opposite to the battery module 20. For example, the fourth reinforcing part 71 is provided with a second slot 74 on the side opposite to the battery module 20, and the second limiting plate 931 of the second engaging part 93 corresponding to the second slot 74 on the fourth reinforcing part 71 extends to the side of the fourth reinforcing part 71 opposite to the battery module 20.

[0197] When the second protrusion 932 is engaged in the second slot 74, the surface of the second limiting plate 931 facing the second reinforcing member 70 can contact the surface of the second reinforcing member 70 away from the battery module 20, or a gap can be formed.

[0198] In some embodiments, the first reinforcing member 60 is fixedly connected to the outer surface of the housing 10, and the first reinforcing member 60, the first side plate 12, and the first end plate 80 are sealed together. For example, sealing rings, adhesives, welding, etc.

[0199] In some embodiments, the second reinforcing member is fixedly connected to the outer surface of the housing 10, and the second reinforcing member 70, the second side plate 13, and the second end plate 90 are sealed together. For example, sealing rings, adhesives, welding, etc.

[0200] In some embodiments, a first sealing element W1 is provided between one end of the housing 10 in the second direction Y and the first end plate 80. Figure 2 (as shown in the diagram); a second seal W2 is provided between the other end of the housing 10 in the second direction Y and the second end plate 90. Figure 2 (as shown in the image).

[0201] The provision of the first seal W1 and the second seal W2 can improve the sealing performance of the battery pack 100, reduce the risk of impurities from the external environment entering the battery pack 100, and help extend the service life of the battery pack 100 and improve the safety performance of the battery pack 100.

[0202] The first seal W1 and the second seal W2 can be solid rubber gaskets. The first seal can also be formed by curing a sealant applied to the end of the housing 10 in the second direction Y between the housing 10 and the first end plate 80. In this embodiment, the cured sealant also serves to connect the first end plate 80 and the housing 10. Similarly, the second seal W2 can be formed by curing a sealant applied to the end of the housing 10 in the second direction Y between the housing 10 and the second end plate 90. In this embodiment, the cured sealant also serves to connect the second end plate 90 and the housing 10.

[0203] In an embodiment where a first reinforcing member 60 and a second reinforcing member 70 are provided at the end of the housing 10 along the second direction Y, the first sealing member may be partially located between the end of the housing 10 and the first end plate 80, and the other part may be located between the end face of the first reinforcing member 60 along the second direction Y and the first end plate 80. The second sealing member may be partially located between the end of the housing 10 and the second end plate 90, and the other part may be located between the end face of the second reinforcing member 70 along the second direction Y and the second end plate 90, thereby increasing the area and improving the sealing effect.

[0204] like Figure 29 As shown, in some embodiments, a first groove 85 is formed on the surface of the first end plate 80 facing the housing 10. The first groove 85 is disposed along the edge of the first end plate 80, and the first seal W1 is disposed in the first groove 85.

[0205] The first sealing element W1 is disposed in the first groove 85. It can be understood that the first sealing element W1 is embedded in the first end plate 80. The first sealing element W1 and the first end plate 80 share a part of the space, which not only provides sealing performance, but also helps to reduce the volume of the battery pack 100, thereby helping to achieve the miniaturization of the battery pack 100 structure.

[0206] Specifically, a first groove 85 is disposed on the edge of the first end plate body 82. The first groove 85 extends along the edge of the first end plate 80, and the extension trajectory of the first groove 85 is U-shaped to match the shape of the end of the housing 10 along the second direction Y.

[0207] The first sealing element W1 is disposed within the first groove 85, that is, the first sealing element W1 is received within the first groove 85. The first sealing element W1 may be fully received within the first groove 85, or it may be partially received within the first groove 85.

[0208] In some embodiments, a second groove (not shown in the figure) is formed on the surface of the second end plate 90 facing the housing 10. The second groove is disposed along the edge of the second end plate 90, and the second seal W2 is disposed in the second groove. The arrangement of the second groove can refer to the arrangement of the first groove 85.

[0209] The second sealing element W2 is disposed in the first groove 85. It can be understood that the second sealing element W2 is housed in the second end plate 90. The second sealing element W2 and the second end plate 90 share a part of the space, which can not only improve the sealing performance, but also help reduce the volume of the battery pack 100, thereby helping to realize the miniaturization of the battery pack 100 structure.

[0210] Specifically, the second groove is disposed on the edge of the second end plate body 92. The second groove extends along the edge of the first end plate 80, and the extension trajectory of the second groove is U-shaped to match the shape of the end of the housing 10 along the second direction Y.

[0211] The second seal W2 is disposed within the second groove, which can be understood as the second seal W2 being housed within the second groove. The second seal may be entirely housed within the second groove, or it may be partially housed within the first groove 85.

[0212] In other embodiments, the first end plate 80 may not have the first groove 85, and the first seal W1 abuts between the surface of the first end plate 80 facing the housing 10 and the end of the housing 10 along the second direction Y. The second end plate 90 may not have the second groove, and the second seal W2 abuts between the surface of the second end plate 90 facing the housing 10 and the end of the housing 10 along the second direction Y, so as to simplify the structure of the first end plate 80 and the second end plate 90.

[0213] Combined with reference Figure 1 , Figure 2 , Figure 30In some embodiments, the battery pack 100 further includes a cover 110 that covers the first opening Q1 of the housing Q; the battery pack 100 also includes a second circuit board 120 located on the side of the battery module 20 away from the base plate 11.

[0214] The cover 110 seals the first opening Q1 of the housing Q, which better protects the internal structure of the housing Q, reduces the risk of damage to the internal structure of the housing Q, and helps extend the service life of the internal structure of the housing Q. The second circuit board 120 is located on the side of the battery module 20 away from the bottom plate 11, that is, the second circuit board 120 is set near the first opening Q1 of the housing Q, which facilitates the installation of the second circuit board 120.

[0215] like Figure 30 As shown, a cavity is formed inside the cover 110, and the cavity of the cover 110 and the accommodating space of the box Q together accommodate the internal structure of the battery pack 100.

[0216] The housing 10, the first end plate 80, and the second end plate 90 are all connected to the cover 110. The housing 10, the first end plate 80, and the second end plate 90 can be welded to the cover 110, bolted to it, snap-fitted to it, etc. For example, referring to reference... Figure 1 , Figure 2 , Figure 23 , Figure 30 A seventh threaded hole 86 is provided on the first end plate 80, and an eighth threaded hole 96 is provided on the second end plate 90. The cover 110 is provided with a plurality of ninth threaded holes 1101 corresponding to the seventh threaded hole 86 and the eighth threaded hole 96. Some of the ninth threaded holes 1101 and the seventh threaded hole 86 are arranged coaxially along the third direction Z, and other parts of the ninth threaded holes 1101 and the eighth threaded hole 96 are arranged coaxially along the third direction Z. The cover 110 is connected to the first end plate 80 and the second end plate 90 by bolts, thereby realizing the connection of the shell 10, the two end plates and the cover 110 into an integral structure, so that the cover 110 seals the first opening Q1 of the box body Q.

[0217] The second circuit board 120 is located on the side of the battery module 20 away from the base plate 11. Specifically, the second circuit board 120 is disposed along the third direction Z on the side of the battery module 20 away from the base plate 11 and close to the first opening Q1 of the housing Q, which facilitates the installation of the second circuit board 120.

[0218] The second circuit board 120 may be equipped with detection devices for detecting internal parameters of the battery pack 100, such as temperature sensors, voltage sensors, pressure sensors, etc.

[0219] In one embodiment, the second circuit board 120 includes a printed circuit board (PCB) with multiple conductive lines (not shown). Optionally, the second circuit board 120 includes a flexible printed circuit board (FPC).

[0220] In one embodiment, the second circuit board 120 includes a BMS (Battery Management System) component, which includes multiple electronic components capable of performing functions such as data acquisition, control, protection, communication, power calculation, signal transmission, and power transmission for the battery cell 21 and battery module 20.

[0221] In one embodiment, along the second direction Y, the first circuit board 26 is disposed between the first end plate 80 and the battery module 20, and the second circuit board 120 is located on the side of the battery module 20 away from the bottom plate 11 along the third direction Z. The first circuit board 26 and the second circuit board 120 are located in different positions of the battery module 20 and do not interfere with each other. This not only facilitates the installation of the first circuit board 26 and the second circuit board 120, but also reduces the risk of short circuit in the battery pack 100.

[0222] like Figure 31 As shown, in some embodiments, the inner surface 121 of the first side plate is provided with a plurality of first protrusions 125, which are spaced apart along a third direction Z. Each first protrusion 125 extends along a second direction Y. Along a first direction X, the first protrusion 125 extends between the sides of two adjacent cells 21.

[0223] In some embodiments, the first protrusion 125 may extend along the second direction Y to both ends of the first side plate 12. In other embodiments, the two ends of the first protrusion 125 along the second direction Y may be at a distance from the two ends of the first side plate 12 along the second direction Y.

[0224] The extension length of the first protrusion 125 along the second direction Y can be the same as the length of the battery cell 21 along the second direction Y, or the extension length of the first protrusion 125 along the third direction Z can be greater than the length of the battery cell 21 along the second direction Y, so as to increase the connection area with the battery cell 21 and improve heat dissipation. Alternatively, the extension length of the first protrusion 125 along the second direction Y can be less than the length of the battery cell 21 along the third direction Z, so that more space can be reserved for the first heat-conducting element 30, and the heat dissipation capacity can be improved by the first heat-conducting element 30.

[0225] like Figure 31As shown, the surface of the first protrusion 125 facing the cell 21 is a first arc surface 1251. In the embodiment where the cell 21 is a soft-pack cell and the battery module 20 is not provided with a third heat-conducting component 27, both sides of the cell 21 in the first direction X are arc surfaces. The surface of the first protrusion 125 facing the cell 21 is a partial area of ​​the first arc surface 1251 that matches the arc surface of the cell 21, so that after the first protrusion 125 extends between two adjacent cells 21, the first protrusion 125 and the cell 21 have the largest possible contact area. Heat can be directly conducted between the cell 21 and the first side plate 12, which is beneficial to improve heat dissipation capacity.

[0226] like Figure 32 As shown, in some embodiments, the inner surface 131 of the second side plate is provided with a plurality of second protrusions 135, which are spaced apart along a third direction Z. Each second protrusion 135 extends along a second direction Y. Along a first direction X, the second protrusion 135 extends between the sides of two adjacent cells 21.

[0227] In some embodiments, the second protrusion 135 may extend along the second direction Y to both ends of the second side plate 13. In other embodiments, the two ends of the second protrusion 135 along the second direction Y may be at a distance from the two ends of the second side plate 13 along the second direction Y, so as to facilitate the connection between the first end plate 80, the second end plate 90, and the two ends of the housing 10.

[0228] The extension length of the second protrusion 135 along the second direction Y can be the same as the length of the battery cell 21 along the second direction Y, or the extension length of the second protrusion 135 along the second direction Y can be greater than the length of the battery cell 21 along the second direction Y, so as to increase the contact area with the battery cell 21 and improve the heat dissipation of the small gear. Alternatively, the extension length of the second protrusion 135 along the second direction Y can be less than the length of the battery cell 21 along the second direction Y, so that more space can be reserved for the second heat-conducting element 50, and the heat dissipation capacity can be improved by the second heat-conducting element 50.

[0229] like Figure 32 As shown, the surface of the second protrusion 135 facing the cell 21 is a second arc surface 1351. In the embodiment where the cell 21 is a soft-pack cell and the battery module 20 is not provided with a third heat-conducting component 27, both sides of the cell 21 in the first direction X are arc surfaces. The surface of the second protrusion 135 facing the cell 21 is a second arc surface 1351 that matches a portion of the arc surface of the cell 21, so that after the second protrusion 135 extends between two adjacent cells 21, the second protrusion 135 and the cell 21 have the largest possible contact area. Heat can be directly conducted between the cell 21 and the second side plate 13, which is beneficial to further improve the heat dissipation capacity.

[0230] In the embodiment where the battery module 20 is provided with the third heat-conducting component 27, the inner surface 121 of the first side plate may not be provided with the first protrusion 832, and the inner surface 131 of the second side plate may not be provided with the second protrusion 932, so as to facilitate the arrangement of the third heat-conducting component 27.

[0231] The number of first protrusions 125 provided on the first side plate 12 and the number of second protrusions 135 provided on the second side plate 13 can be the same or different.

[0232] Two adjacent battery cells 21 may have a first protrusion 125 extending from one end along the first direction X to the space between the two adjacent battery cells 21, thereby increasing the contact area and improving heat dissipation. The other end of two adjacent battery cells 21 may also have a second protrusion 135 extending to the space between the two adjacent battery cells 21, further increasing the contact area and further improving heat dissipation.

[0233] The first protrusion 125 can be inserted between every two adjacent battery cells 21, thus providing a larger heat dissipation area for each pair of adjacent battery cells 21 and improving heat dissipation capacity. Alternatively, the first protrusion 125 can be inserted between only some of the two adjacent battery cells 21, which can reduce the number of first protrusions 125 on the first side plate 12 and facilitate the processing of the first side plate 12.

[0234] The second protrusion 135 can be inserted between every two adjacent cells 21, thus providing a larger heat dissipation area for each pair of adjacent cells 21 and further improving heat dissipation capacity. Alternatively, the second protrusion 135 can be inserted between only some of the two adjacent cells 21, which can reduce the number of first protrusions 125 on the second side plate 13 and facilitate the processing of the second side plate 13.

[0235] There are several ways to form the first protrusion 125. For example, the first protrusion 125 and the first side plate 12 can be separately provided. The first protrusion 125 can be connected to the inner surface 121 of the first side plate by welding, bonding, or other methods, thereby realizing the first protrusion 125 on the inner surface 121 of the first side plate. Alternatively, the first protrusion 125 can also be formed by stamping the first side plate 12. Similarly, there are several ways to form the second protrusion 135. For example, the second protrusion 135 and the second side plate 13 can be separately provided. The second protrusion 135 can be connected to the inner surface 131 of the second side plate by welding, bonding, or other methods, thereby realizing the second protrusion 135 on the inner surface 131 of the second side plate. Alternatively, the second protrusion 135 can also be formed by stamping the second side plate 13.

[0236] like Figure 31 , Figure 32As shown, in some embodiments, a first recess 126 is formed on the outer surface 122 of the first side plate at a position corresponding to the first protrusion 125. A second recess 136 is formed on the outer surface 132 of the second side plate at a position corresponding to the second protrusion 135. The provision of the first recess 126 and the second recess 136 can increase the heat dissipation area of ​​the first side plate 12 and the second side plate 13 to the outside, thereby improving the heat dissipation efficiency.

[0237] The shape of the first recess 126 can be the same as the shape of the first protrusion 125, that is, when viewed along the second direction Y, the shape of the first recess 126 and the shape of the first protrusion 125 are the same. The first recess 126 can be a groove formed by a grooving process. After the first recess 126 is formed, the thickness of the first side plate 12 at the position corresponding to the first recess 126 is less than the thickness at other positions of the first side plate 12. The shape of the second recess 136 can be the same as the shape of the second protrusion 135, that is, when viewed along the second direction Y, the shape of the second recess 136 and the shape of the second protrusion 135 are the same. The second recess 136 can be a groove formed by a grooving process. After the second recess 136 is formed, the thickness of the second side plate 13 at the position corresponding to the second recess 136 is less than the thickness at other positions of the second side plate 13.

[0238] The first recess 126 can also be formed by stamping the first side plate 12. During the stamping process, the outer surface 122 of the first side plate is recessed inward to form the first recess 126, and the inner surface 121 of the first side plate protrudes at the position corresponding to the first recess 126, thereby forming the first protrusion 125. That is, the first protrusion 125 and the first recess 126 are formed by stamping. The forming method of the first protrusion 125 and the first recess 126 is simple. The second recess 136 can also be formed by stamping the second side plate 13. During the stamping process, the outer surface 132 of the second side plate is recessed inward to form the second recess 136, and the inner surface 131 of the second side plate protrudes at the position corresponding to the second recess 136, thereby forming the second protrusion 135. That is, the second protrusion 135 and the second recess 136 are formed by stamping. The forming method of the second protrusion 135 and the second recess 136 is simple.

[0239] The first recess 126 and the first protrusion 125 can also be cast and injection molded simultaneously when the housing 10 is formed using processes such as casting or injection molding. Similarly, the second recess 136 and the second protrusion 135 can also be cast and injection molded simultaneously when the housing 10 is formed using processes such as casting or injection molding.

[0240] If the amount of the first colloid D1 injected through the first through hole 127 or the second through hole 137 is sufficient, the first colloid D1 can completely fill the space between the first end plate 80 and the battery module 20, and the first colloid D1 can cover the first circuit board 26 to improve the sealing performance.

[0241] A portion of the first colloid D1 is connected to the first circuit board 26, improving heat dissipation for the first circuit board.

[0242] like Figures 37-38 As shown, in some embodiments, the first side plate 12 is provided with a first side plate opening 128, which extends through the first side plate 12 along a first direction X. The housing 10 also includes a first heat dissipation fin 130, which covers the first side plate opening 128 and is connected to the first side plate 12. The second side plate 13 is provided with a second side plate opening 138, which extends through the second side plate 13 along a first direction X. The housing 10 also includes a second heat dissipation fin 140, which covers the second side plate opening 138 and is connected to the second side plate 13.

[0243] The first side plate 12 is provided with a first side plate opening 128, and the first heat dissipation fin 130 is connected to the first side plate 12 and covers the first side plate opening 128. The second side plate 13 is provided with a second side plate opening 138, and the second heat dissipation fin 140 is connected to the second side plate 13 and covers the second side plate opening 138. The battery module 20 can dissipate heat through the first heat dissipation fin 130 and the second heat dissipation fin 140, thereby further improving the heat dissipation efficiency.

[0244] The shape of the opening 128 on the first side plate can be various, such as a circular hole, a square hole, a rectangular hole, etc. The shape of the opening 138 on the second side plate can also be various, such as a circular hole, a square hole, a rectangular hole, etc.

[0245] The first heat dissipation fin 130 is connected to the first side plate 12. There are various ways to connect the first heat dissipation fin 130 and the first side plate 12, such as welding connection, bolt connection, snap-fit ​​connection, etc.

[0246] The first heat dissipation fin 130 covering the first side plate opening 128 means that, when viewed along the first direction X, part or all of the first heat dissipation fin 130 is located within the first side plate opening 128. The first heat dissipation fin portion 1301 of the first heat dissipation fin 130 is arranged outwards, and the first heat dissipation fin portion 1301 of the first heat dissipation fin 130 is arranged away from the battery module 20 along the first direction X. The surface of the first heat dissipation fin 130 facing the battery module 20 and the inner surface 121 of the first side plate are located in the same plane, which facilitates the installation of the internal structure of the housing 10.

[0247] The first side plate 12 may have one or more first side plate openings 128. In embodiments where the first side plate 12 has multiple first side plate openings 128, each first side plate opening 128 may correspond to a first heat dissipation fin 130. Viewed along the first direction X, the area of ​​the first heat dissipation fin 130 is larger than the area of ​​the first side plate 12 without a first side plate opening 128, so that the heat dissipation area is large enough to improve heat dissipation capacity.

[0248] The shape of the second side plate opening 138 can be various, such as a circular hole, a square hole, a rectangular hole, etc.

[0249] The second heat dissipation fin 140 is connected to the second side plate 13. There are various ways to connect the second heat dissipation fin 140 and the second side plate 13, such as welding connection, bolt connection, snap-fit ​​connection, etc.

[0250] The second heat dissipation fin 140 covering the second side plate opening 138 means that, when viewed along the first direction X, part or all of the second heat dissipation fin 140 is located within the second side plate opening 138. The second heat dissipation fin portion 1401 of the second heat dissipation fin 140 is arranged outwards, and the second heat dissipation fin portion 1401 of the second heat dissipation fin 140 is arranged away from the battery module 20 along the first direction X. The surface of the second heat dissipation fin 140 facing the battery module 20 and the inner surface of the side plate are located in the same plane, which facilitates the structural installation inside the housing 10.

[0251] The second side plate 13 may have one or more second side plate openings 138. In embodiments where the second side plate 13 has multiple second side plate openings 138, each second side plate opening 138 may correspond to a second heat dissipation fin 140. Viewed along the first direction X, the area of ​​the second heat dissipation fin 140 is larger than the area of ​​the second side plate 13 where no second side plate opening 138 is provided, so that the heat dissipation area is large enough to improve the heat dissipation capacity.

[0252] The first side plate 12 and the second side plate 13 can have the same structure. For example, the first side plate 12 and the second side plate 13 can both adopt a structure with protrusions on their inner surfaces, or the first side plate 12 and the second side plate 13 can both adopt a structure with side plate openings and heat dissipation fins covering the side plate openings.

[0253] The structures of the first side plate 12 and the second side plate 13 can also be different. For example, the first side plate 12 has a first protrusion 125 on its inner surface, and the second side plate 13 has a second side plate opening 138 and a second heat dissipation fin 140 covering the second side plate opening 138.

[0254] In an embodiment where the first side plate 12 has a first side plate opening 128 and a first heat dissipation fin 130 covers the first side plate opening 128, the inner surface of the area of ​​the first side plate 12 where the first side plate opening 128 is not provided may also have a first protrusion 125. In an embodiment where the second side plate 13 has a second side plate opening 138 and a second heat dissipation fin covers the second side plate opening 138, the inner surface of the area of ​​the second side plate 13 where the second side plate opening 138 is not provided may also have a second protrusion 135. In this way, the first side plate 12 and the second side plate 13 can dissipate heat through the heat dissipation fins and also through the contact between the first protrusion 125 and the second protrusion 135 and the battery cell 21, further improving the heat dissipation efficiency.

[0255] like Figure 2 , Figure 39 As shown, in some embodiments, the battery pack 100 further includes a bracket 150 located between the housing Q and the cover 110, with the housing Q and the cover 110 respectively connected to the bracket 150, and a second circuit board 120 located between the bracket 150 and the cover 110.

[0256] The bracket 150 is located between the housing Q and the cover 110, and the second circuit board 120 is located between the bracket 150 and the cover 110, which facilitates the installation and fixation of the second circuit board 120. The bracket 150 can also act as a separator between the second circuit board 120 and the battery module 20, reducing the risk of interference between the second circuit board 120 and the battery module 20.

[0257] The bracket 150 can be connected to the first end plate 80, the second end plate 90, the housing 10, and the cover 110. The bracket 150 and the first end plate 80, the second end plate 90, the housing 10, and the cover 110 can be detachably connected, such as by bolts or screws. For example,... Figure 1 , Figure 39 As shown, the bracket 150 is provided with multiple tenth threaded holes 1501. Some of the tenth threaded holes 1501, the seventh threaded hole 86, and the ninth threaded hole 1101 are arranged coaxially, and bolts are threaded through the eleventh threaded hole 15071, the seventh threaded hole 86, and the ninth threaded hole 1101 in sequence. Another part of the tenth threaded holes 1501, the eighth threaded hole 96, and a part of the ninth threaded hole 1101 are arranged coaxially, and bolts are threaded through the tenth threaded hole 1501, the eighth threaded hole 96, and the ninth threaded hole 1101 in sequence, thereby realizing the connection of the cover 110, the bracket 150, and the two end plates (the first end plate 80 and the second end plate 90).

[0258] In some embodiments, a portion of the bracket 150 is housed within the housing Q, and another portion of the bracket 150 abuts against the open end of the housing Q. Along a third direction Z, the bracket 150 has a first surface 1502 and a second surface 1503 disposed opposite to each other. The first surface 1502 faces the cover 110, and the second surface 1503 faces the battery module 20. A tenth threaded hole 1501 penetrates the first surface 1502 and the second surface 1503. The bracket 150 has a protrusion 1504 protruding from the second surface 1503 toward the battery module 20, extending from the first opening Q1 into the housing Q. The second surface 1503 abuts against the open end of the housing Q. A plurality of tenth threaded holes 1501 are disposed on the outer periphery of the protrusion 1504. The protrusion 1504 extends from the first opening Q1 into the housing Q and, together with the base plate 11, can limit the positioning of the battery module 20.

[0259] like Figure 2 , Figures 40-43 As shown, in some embodiments, along the third direction Z, the bracket 150 has a receiving portion 1505 on its first surface 1502 facing the cover 110. The receiving portion 1505 is recessed from the first surface 1502 in the third direction Z toward the battery module 20, and a protrusion 1504 is formed on the second surface 1503 of the bracket 150 away from the cover 110. The second surface 1503 abuts against the opening end of the housing Q, and the protrusion 1504 is inserted into the housing Q.

[0260] like Figure 40 As shown, the receiving portion 1505 is provided with crisscrossing reinforcing ribs 1506 to increase the strength of the bracket 150. The receiving portion 1505 also includes connecting posts 1507 for fixing the second circuit board 120. The connecting posts 1507 extend out of the receiving portion 1505 in a third direction Z, and have an eleventh threaded hole 15071, allowing the second circuit board 120 to be connected to the connecting posts 1507 via bolts. Four connecting posts 1507 are provided within the receiving portion 1505, distributed at the four corners of the rectangle.

[0261] In other embodiments, the bracket 150 may form a receiving portion 1505 only on the first surface 1502, and the bracket 150 may be flat on the side opposite to the cover 110 without forming a protrusion 1504. In this way, the bracket 150 may not occupy the space inside the housing Q, which is beneficial to improving the energy density of the battery pack 100.

[0262] In other embodiments, the bracket 150 may not form a receiving portion 1505 on the first surface 1502, or the receiving portion 1505 may be formed only on the first surface 1502, which simplifies the structure of the bracket 150 and reduces the processing difficulty.

[0263] In other embodiments, the support 150 may also be a flat plate structure.

[0264] like Figure 43 , Figure 44 As shown, the bracket 150 is also provided with a plurality of twelfth threaded holes 1508. The twelfth threaded holes 1508 can be provided on the protrusion, specifically in the area where the protrusion overlaps with the first side plate 12 and the second side plate 13.

[0265] The first side plate 12 is also provided with a thirteenth threaded hole 129, and the second side plate 13 is also provided with a fourteenth threaded hole 139. Part of the twelfth threaded hole 1508 and the thirteenth threaded hole 129 are arranged coaxially, and another part of the twelfth threaded hole 1508 and the fourteenth threaded hole 139 are arranged coaxially. The bolt is threadedly connected to the twelfth threaded hole 1508 and the thirteenth threaded hole 129 to realize the connection between the first side plate 12 and the second side plate 13. The bolt is threadedly connected to the fourteenth threaded hole 139 and the twelfth threaded hole 1508 to realize the connection between the bracket 150 and the second side plate 13, and then realize the connection between the bracket 150 and the housing 10.

[0266] The bracket 150 can also be connected to the first end plate 80, the second end plate 90, the shell 10, and the cover 110 by other means, such as welding or adhesive bonding.

[0267] In some embodiments, the battery module 20 is located between the bracket 150 and the base plate 11, with the bracket 150 in contact with the battery module 20.

[0268] The bracket 150 contacts the battery module 20, which helps the bracket 150 and the base plate 11 of the housing 10 to jointly limit the battery module 20, alleviate the problem of the battery module 20 moving around, and improve the safety performance of the battery pack 100.

[0269] In embodiments where the bracket 150 has a receiving portion 1505 and a protrusion 1504, after the protrusion 1504 is inserted into the housing Q, the surface of the protrusion 1504 facing away from the cover 110 contacts the battery module 20. In embodiments where the bracket 150 has a receiving portion 1505 but no protrusion 1504, and in embodiments where the bracket 150 has a flat structure, the second surface 1503 of the bracket 150 facing away from the cover 110 not only abuts against the opening end of the housing Q but also contacts the battery module 20.

[0270] The bracket 150 contacts the battery module 20 and can apply pressure to the battery module 20. Specifically, the bracket 150 can apply pressure to the battery module 20 after the cell 21 has undergone cyclic expansion, or it can apply pressure to the battery module 20 before the cell 21 has undergone cyclic expansion.

[0271] Of course, in other embodiments, the bracket 150 and the battery module 20 may not be in contact.

[0272] In some embodiments, a third seal (not shown in the figure) is provided between one end of the housing Q forming the first opening Q1 and the bracket 150, the third seal connecting the opening end of the housing Q and the bracket 150.

[0273] A third sealing element is provided between the end of the housing Q forming the first opening Q1 and the bracket 150, which helps to improve the airtightness of the battery pack 100, thereby improving the safety performance of the battery pack 100 and extending the service life of the battery pack 100.

[0274] The third seal can be a solid rubber gasket. Alternatively, the third seal can be formed by curing sealant applied between the opening of the housing Q and the bracket 150.

[0275] like Figure 41 , Figure 45 As shown, in some embodiments, the bracket 150 is provided with a third groove 1509 on the side facing the box Q. The third groove 1509 extends circumferentially along the first opening Q1. One end of the box Q forming the first opening Q1 is inserted into the third groove 1509, and the third seal is received in the third groove 1509.

[0276] A third groove 1509 is provided on the side of the bracket 150 facing the housing Q. One end of the housing Q forming the first opening Q1 is inserted into the third groove 1509, allowing the housing Q and the bracket 150 to be accurately positioned relative to each other. Furthermore, the bracket 150 and the housing Q have an overlapping area in the recessed direction of the third groove 1509, sharing a portion of the space. This reduces the size of the battery pack 100, facilitating its miniaturization. The third seal is housed within the third groove 1509, ensuring stable installation of the third seal.

[0277] The second surface 1503 of the bracket 150 facing the battery module 20 is also provided with a limiting part 1510. The limiting part 1510 protrudes from the second surface 1503 in the third direction (Z) towards the battery module 20. The limiting part 1510 extends circumferentially along the first opening Q1 of the housing Q and surrounds the outer periphery of the protrusion 1504. The surface of the limiting part 1510 facing the protrusion 1504, the second surface 1503, and the outer peripheral surface of the protrusion 1504 together define a third groove 1509. The surface of the limiting part 1510 facing the protrusion 1504 and the outer peripheral surface of the protrusion 1504 limit the housing Q on the inner and outer sides of the first side plate 12, the inner and outer sides of the second side plate 13, the inner and outer sides of the first end plate 80, and the inner and outer sides of the second end plate 90, respectively.

[0278] The third seal can be partially or completely housed within the third groove 1509.

[0279] The third seal can be a solid rubber gasket. Alternatively, the third seal can be formed by curing a liquid sealant applied to the third groove 1509.

[0280] In some embodiments, along the third direction Z, the projection of the third through hole 1511 and the projection of the electrode assembly are separate, limiting the second insulating material from covering the packaging body 232 and reducing the effect of the second colloid D2 on the expansion of the cell 21.

[0281] like Figures 46-49 As shown, in some embodiments, the bracket 150 is provided with two third through holes 1511, which are arranged at Z-intervals along the third direction.

[0282] Looking along the third direction Z, one of the two third through holes 1511 overlaps with the space between the first end plate 80 and the battery module 20. Figure 48 As shown in the diagram, the other of the two third through holes 1511 overlaps with the space between the second end plate 90 and the battery module 20. Figure 49 As shown in the figure, the second colloid D2 can be injected into the space between the first end plate 80 and the battery module 20 through the two third through holes 1511, and the second colloid D2 can be injected into the space between the second end plate 90 and the battery module 20, respectively.

[0283] In the embodiment where the first side plate 12 has a first through hole 127 and the second side plate 13 has a second through hole 137, the bracket 150 may not have a third through hole 1511. Instead, the first colloid D1 is filled between the first end plate 80 and the battery module 20 and between the second end plate 90 and the battery module 20 through the second through hole 137, thus simplifying the structure of the bracket 150.

[0284] In the embodiment where the bracket 150 is provided with a third through hole 1511, the first through hole 127 may not be provided on the first side plate 12, and the second through hole 137 may not be provided on the second side plate 13. The second colloid D2 is injected into the box Q only through the third through hole 1511, which simplifies the structure of the first side plate 12 and the second side plate 13.

[0285] Of course, it is also possible to provide a first through hole 127 on the first side plate 12, a second through hole 137 on the second side plate 13, and a third through hole 1511 on the bracket 150. The second through hole 137 and the third through hole 1511 can simultaneously inject adhesive into the box Q, which can improve the glue injection efficiency.

[0286] In this application, the first colloid D1 and the second colloid D2 may be made of the same or different materials. The first colloid D1 and the second colloid D2 may be insulating adhesives.

[0287] In some embodiments, a fourth seal (not shown) is provided between the cover 110 and the bracket 150.

[0288] A third sealing element is provided between the cover 110 and the bracket 150, which helps to improve the airtightness of the battery pack 100, thereby improving the safety performance of the battery pack 100 and extending the service life of the battery pack 100.

[0289] The fourth seal can be a solid rubber gasket. Alternatively, it can be formed by curing a sealant applied between the cover 110 and the bracket 150. Figure 30 , Figure 50 As shown, in some embodiments, a fourth groove 1102 is provided on the side of the cover 110 facing the bracket 150. The fourth groove 1102 extends circumferentially along the first opening Q1, and at least a portion of the fourth seal is received within the fourth groove 1102.

[0290] A fourth groove 1102 is provided on the side of the cover 110 facing the bracket 150. At least part of the fourth seal is housed in the fourth groove 1102. The fourth seal and the cover 110 share a portion of the space, which helps to reduce the volume of the battery pack 100 and thus helps to achieve miniaturization of the battery pack 100 structure.

[0291] The fourth groove 1102 is a closed structure that is circumferentially closed along the first opening Q1 of the housing Q. The fourth seal is received within the fourth groove 1102, that is, the fourth seal is embedded within the fourth groove 1102. The fourth seal may be fully received within the fourth groove 1102 or partially received within the fourth groove 1102.

[0292] This application also provides an electrical device, which includes a power-consuming body and a battery pack 100 provided in any of the above embodiments. The electrical device includes, but is not limited to, energy storage systems, electric vehicles, power tools, and drones. The battery pack 100 provides electrical energy to the power-consuming body. The battery pack 100 provided in any of the above embodiments has good heat dissipation capacity and high heat dissipation efficiency, thereby resulting in high safety performance of the battery pack 100. It can meet the high-rate, non-static, continuous charging and discharging operating conditions of the electrical device, and also helps to improve the electrical safety of the electrical device equipped with the battery pack 100.

[0293] like Figure 51 As shown, this application embodiment also provides a method for manufacturing the aforementioned battery pack 100, the method for manufacturing the battery pack 100 including:

[0294] S100, a housing 10 is provided, and an external force is applied to the housing 10 to deform the first side plate 12 and the second side plate 13 in a direction away from each other;

[0295] S300 provides a battery module 20 and a first heat-conducting component 30, wherein the first heat-conducting component 30 is disposed on the first side plate 12 or the battery module 20;

[0296] S400, along a direction perpendicular to the base plate 11, the battery module 20 is placed between the first side plate 12 and the second side plate 13 that are far apart from each other;

[0297] S500, remove the external force to reset the first side plate 12 and the second side plate 13.

[0298] In S100, a force is applied to the first side plate 12 and the second side plate 13 in a direction away from each other, and the distance between the first side plate 12 and the second side plate 13 gradually increases in the direction away from the bottom plate 11, forming a larger first open end.

[0299] The first thermal conductive element 30 can be a liquid thermal conductive adhesive coated on the inner surface 121 of the first side plate, or a solid thermal conductive adhesive fixed to the inner surface 121 of the first side plate. Alternatively, the first thermal conductive element 30 can be a liquid thermal conductive adhesive coated on the battery module 20, or a solid thermal conductive adhesive fixed to the battery module 20.

[0300] Before performing S400, a second heat-conducting component 50 may also be provided, which is disposed on the second side plate 13 or the battery module 20.

[0301] The second thermal conductive element 50 can be a liquid thermal conductive adhesive coated on the inner surface 131 of the second side plate, or a solid thermal conductive adhesive fixed to the inner surface 131 of the second side plate. Alternatively, the second thermal conductive element 50 can be a liquid thermal conductive adhesive coated on the battery module 20, or a solid thermal conductive adhesive fixed to the battery module 20.

[0302] After the external force is removed, the first side plate 12 and the second side plate 13 are reset, which will compress the first thermally conductive element 30 disposed between the first side plate 12 and the battery module 20, and the second thermally conductive element 50 disposed between the second side plate 13 and the battery module 20. In an embodiment where the first thermally conductive element 30 is a liquid thermally conductive adhesive coated on the inner surface 121 of the first side plate or on the battery module 20, the liquid thermally conductive adhesive is compressed during the reset of the first side plate 12, which facilitates the diffusion of the liquid thermally conductive adhesive between the first side plate 12 and the battery module 20. Similarly, in an embodiment where the second thermally conductive element 50 is a liquid thermally conductive adhesive coated on the inner surface 131 of the second side plate or on the battery module 20, the liquid thermally conductive adhesive is compressed during the reset of the second side plate 13, which facilitates the diffusion of the liquid thermally conductive adhesive between the second side plate 13 and the battery module 20.

[0303] The placement of the first heat-conducting component 30 on the first side plate 12 or the battery module 20, and the placement of the second heat-conducting component 50 on the second side plate 13 or the battery module 20, can be done before or after applying external force to the housing 10.

[0304] like Figure 52 As shown, when an external force is applied to the housing 10, the first side plate 12 and the second side plate 13 deform in directions that are far apart from each other. Figure 50 The first side plate 12 and the second side plate 13 shown by solid lines are the first side plate 12 and the second side plate 13 before the application of external force, while the first side plate 12 and the second side plate 13 shown by dashed lines are the first side plate 12 and the second side plate 13 after the application of external force. The first side plate 12 and the second side plate 13 are cantilever beams with respect to the bottom plate 11.

[0305] By applying an external force to the housing 10, the first side plate 12 and the second side plate 13 are deformed in a direction away from each other. This creates a larger opening at the end of the housing 10 away from the bottom plate 11, providing space for the clamp to hold the battery module 20 into the housing 10. After the external force is removed, the first side plate 12 and the second side plate 13 are reset. The distance between the first side plate 12 and the battery module 20, and the distance between the second side plate 13 and the battery module 20, can be very small. This can shorten the heat conduction path between the battery module 20 and the first side plate 12 of the housing 10, and between the battery module 20 and the second side plate 13, thereby improving the heat dissipation capacity of the battery pack 100.

[0306] In some embodiments, after the external force is removed, the method of manufacturing the battery pack 100 further includes:

[0307] S600 provides two end plates, which are fixedly connected to the two ends of the first side plate 12 and the second side plate 13, so that the housing 10 and the two end plates form a box Q with a first opening Q1, which is opposite to the bottom plate 11.

[0308] S700 provides a cover 110, which seals the first opening Q1.

[0309] The housing 10, the two end plates, and the cover 110 together define the space for accommodating the battery module 20, providing better protection for the battery module 20.

[0310] After the external force is removed, the two end plates are connected to the two ends of the first side plate 12 and the second side plate 13, and the cover 110 is used to seal the first opening Q1 of the box body Q, which helps to improve the airtightness of the battery pack 100.

[0311] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, include: A housing, the housing comprising a bottom plate, a first side plate and a second side plate, the first side plate and the second side plate being disposed opposite to each other along a first direction, the bottom plate connecting the first side plate and the second side plate; A battery module is located between the first side plate and the second side plate. The battery module includes a plurality of cells arranged along a third direction. Each cell includes an electrode assembly, a packaging bag, and a tab connected to the electrode assembly. The packaging bag has a sealing portion, and the tab extends out of the packaging bag from the sealing portion. There is a first space between the sealing portions of two adjacent cells. The first side plate is provided with a first through hole, which penetrates the first side plate along a first direction, and the first through hole communicates with a portion of the first space; A first colloid, at least partially disposed in the first space, the first through-hole being configured to dispose of a first insulating material in the first space to form the first colloid, the first colloid filling the first space; The battery module also includes a first circuit board, the tabs are connected to the first circuit board, the first circuit board and the packaging bag are arranged along a second direction, a portion of the first colloid is connected to the first circuit board, and the first direction, the second direction and the third direction are perpendicular to each other.

2. The battery pack according to claim 1, characterized in that, A portion of the first colloid is located in the first through hole.

3. The battery pack according to claim 1, characterized in that, The second side plate is provided with a second through hole. Along the first direction, the second through hole penetrates the second side plate and communicates with a portion of the first space.

4. The battery pack according to claim 3, characterized in that, A portion of the first colloid is located in the second through hole.

5. The battery pack according to claim 3, characterized in that, Along the first direction, the projections of the first through hole and the second through hole overlap.

6. The battery pack according to claim 1, characterized in that, The battery pack also includes a bracket, the bracket and the battery module are arranged along a third direction, and the bracket is provided with a third through hole; The battery pack further includes a first end plate, a second end plate, and a second colloid. The first end plate, the second end plate, and the housing form a housing. The second colloid is disposed in the gap between the first end plate and the first circuit board. The third through hole is configured to allow a third insulating material to be injected into the housing to form the second colloid.

7. The battery pack according to claim 6, characterized in that, Along the third direction, the projection of the third through hole and the projection of the electrode assembly are offset.

8. The battery pack according to claim 7, characterized in that, The bracket is configured to apply pressure to the battery module.

9. The battery pack according to any one of claims 1-8, characterized in that, The battery pack also includes a second circuit board and a connection assembly, wherein the battery module and the second circuit board are arranged along the third direction; The connection component connects the first circuit board and the second circuit board, and the connection component is configured to transmit electrical signals and electrical energy of the battery module.

10. The battery pack according to any one of claims 1-8, characterized in that, Along the first direction, there is a first gap between the first side plate and the battery module; The battery pack further includes a first heat-conducting component, which is disposed in the first gap, and the battery module and the first side plate are connected through the first heat-conducting component. The first side plate and the second side plate are configured to move away from each other under the action of an external force in order to place the battery module in the housing.

11. The battery pack according to claim 10, characterized in that, Along the first direction, the length of the first gap is 0.05mm to 2.5mm.

12. The battery pack according to claim 10, characterized in that, Along the first direction, the length of the first gap is 0.1mm to 1.9mm.

13. The battery pack according to claim 10, characterized in that, Along the first direction, the length of the first gap is 0.1mm to 1.4mm.

14. The battery pack according to claim 10, characterized in that, There is a second gap between the second side plate and the battery module; The battery pack further includes a second heat-conducting element, which is disposed in the second gap; Along the first direction, the length of the second gap is 0.05mm to 2.5mm.

15. The battery pack according to claim 14, characterized in that, Along the first direction, the length of the second gap is 0.1mm to 1.9mm.

16. The battery pack according to claim 15, characterized in that, Along the first direction, the length of the second gap is 0.1mm to 1.4mm.

17. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1-16.

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