Battery pack and electrical device

Abstract

A battery pack and an electrical device. The battery pack comprises a battery cell module (20), a housing (10), and a first limiting member (30). The battery cell module (20) comprises a plurality of battery cells (21) stacked in a first direction (X). The housing (10) comprises a bottom wall (11) and a top wall (12) arranged opposite to each other in a second direction (Z). The battery cell module (20) is accommodated in the housing (10). The battery cells (21) are fixed to the bottom wall (11) and separated from the top wall (12). The second direction (Z) is perpendicular to the first direction (X). The first limiting member (30) comprises a main body portion (31). The battery cell module (20) and the main body portion (31) are sequentially arranged along the first direction (X). The battery cell module (20) abuts the main body portion (31). The main body portion (31) is fixed to the bottom wall (11) and separated from the top wall (12). The first limiting member (30) can limit expansion of the battery cell module (20), and can provide an expansion space for the battery cell module (20).

Description

Battery packs and electrical equipment Technical Field

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

[0002] Battery packs are currently widely used in drones, electric vehicles, smart energy storage devices, and other fields. A battery pack typically consists of multiple cells. During use, the cells expand. When the expansion reaches a certain level, it can lead to risks such as short circuits, lithium plating, casing rupture, or even thermal runaway or explosion.

[0003] Summary of the Invention

[0004] One object of this application is to provide a battery pack and electrical device that can limit the expansion of the battery cells.

[0005] This application provides a battery pack, including a cell module, a housing, and a first limiting member. The cell module includes a plurality of cells stacked along a first direction. The housing includes a bottom wall and a top wall disposed opposite each other along a second direction. The cell module is housed within the housing, and the cells are fixed to the bottom wall and separated from the top wall. The second direction is perpendicular to the first direction. The first limiting member includes a main body portion. The cell module and the main body portion are sequentially disposed along the first direction, and the cell module and the main body portion abut against each other. The main body portion is fixed to the bottom wall and separated from the top wall.

[0006] In this application, the main body is fixed to the bottom wall and abuts against the battery cell module, so that the main body can apply pressure to the battery cell module when the battery cell module expands, thereby limiting the expansion of the battery cell module; and the main body is separated from the top wall, so that the side of the main body near the top wall can undergo a certain displacement or deformation along the expansion direction when the battery cell module expands, providing space for the expansion of the battery cell module and improving safety performance.

[0007] In one or more of the above optional embodiments, the first limiting member includes a first fixing part connected to the main body portion. Along the first direction, the first fixing part is located on the side of the main body portion away from the battery cell module and is fixed to the bottom wall. By configuring the first fixing part connected to the main body portion and fixing the main body portion to the bottom wall, the main body portion is fixed relative to the bottom wall, which facilitates the fixing of the main body portion to the bottom.

[0008] In one or more of the above optional embodiments, the first limiting member includes a second fixing part and a third fixing part, which are connected to opposite sides of the main body along a third direction perpendicular to the first and second directions. The housing includes a first sidewall and a second sidewall disposed opposite to each other along the third direction, with the second fixing part fixed to the second sidewall and the third fixing part fixed to the first sidewall. Providing the second and third fixing parts strengthens the fixation between the main body and the housing, which is beneficial for enhancing the effect of the main body in restricting the expansion of the battery cell module.

[0009] In one or more of the above optional embodiments, the second sidewall is provided with a first protrusion facing the second fixing part, and the second fixing part is fixed to the first protrusion; the first sidewall is provided with a second protrusion facing the third fixing part, and the third fixing part is fixed to the second protrusion. Providing the first and second protrusions facilitates the assembly and fixing of the second and third fixing parts to the sidewall.

[0010] In one or more of the above optional embodiments, the first fixing part is located between the second fixing part and the third fixing part. The first fixing part is fixed to the second fixing part and the third fixing part, which helps to further strengthen the fixing of the main body and the shell, and further enhances the effect of the main body in restricting the expansion of the battery cell module.

[0011] In one or more of the above optional embodiments, the main body includes a first part and a second part. In a third direction, the first part extends beyond the second part, and the second fixing part and the third fixing part are connected to the first part, which is conducive to the deformation of the second part.

[0012] In one or more of the above optional embodiments, a notch is formed between the first part and the second part; the first limiting member includes a mounting part connected to the second part, and along the first direction, the mounting part is located on the side of the main body away from the cell module; the battery pack includes a wire harness, which passes through the notch and is fixed to the mounting part, which is beneficial for the arrangement and fixation of the wire harness.

[0013] In one or more of the above optional embodiments, the housing includes a rear wall and a front wall disposed opposite to each other along a first direction, and a first limiting member is located between the front wall and the rear wall; the mounting part includes a first mounting part, and the battery pack includes a first circuit board and a first wiring harness, the first wiring harness being a communication wiring harness, the first wiring harness being connected to the first circuit board and passing through a notch along the first direction and fixed to the first mounting part, facilitating the management of the wiring harness.

[0014] In one or more of the above optional embodiments, the mounting portion includes a second mounting portion, and the first mounting portion and the second mounting portion are spaced apart along a second direction; the battery pack includes a second wiring harness, which passes through a notch along a first direction and is fixed to the second mounting portion, and the second wiring harness is a power wiring harness. Separating and fixing the first and second wiring harnesses facilitates wiring harness organization.

[0015] In one or more of the above optional embodiments, along the second direction, the length of the first part is L1, the length of the battery cell is L2, 1 / 2L2 < L1 < 2 / 3L2, which is beneficial for the first limiting member to restrict the expansion of the battery cell.

[0016] In one or more of the above optional embodiments, the first limiting member includes multiple reinforcing members, which are fixed to the side of the main body away from the cell module and spaced apart along a third direction, which helps the first limiting member to restrict the expansion of the cell module.

[0017] In one or more of the above optional embodiments, the battery pack includes a second limiting member, and along the first direction, the first limiting member and the second limiting member are respectively disposed on both sides of the cell module; the housing includes a rear wall, and the second limiting member abuts against the cell module and is fixedly connected to the rear wall, which is beneficial to further restrict the expansion of the cell module.

[0018] In one or more of the above optional embodiments, the second limiting member includes a base and a plurality of connecting portions disposed on the base. The base abuts against the battery cell module, the connecting portions are fixed to the rear wall, and a gap is formed between the base and the rear wall. This gap provides space for the expansion of the battery cell module.

[0019] In one or more of the above optional embodiments, the battery pack includes a first insulating component, a first adhesive component, and a second adhesive component. The first insulating component is disposed between the cell module and the bottom wall. The first adhesive component bonds the cell module and the first insulating component. The second adhesive component bonds the first insulating component and the bottom wall, which facilitates the installation and fixing of the cell module and the bottom wall.

[0020] In one or more of the above optional embodiments, the battery pack includes a second insulating member, which is disposed between the top wall and the cell module along the second direction; along the second direction, there is a gap between the first limiting member and the second insulating member, or the first limiting member and the second insulating member are in contact connection, which is conducive to the deformation of the first limiting member.

[0021] In one or more of the above optional embodiments, there is a gap between the battery cell and the second insulator, or the battery cell and the second insulator are in contact connection, providing space for the battery cell to expand.

[0022] In one or more of the above optional embodiments, the contact between the battery cell and the second insulating member facilitates the fixation of the battery cell within the housing.

[0023] In one or more of the above optional embodiments, the battery cell module includes a plurality of second buffers, which are disposed between two adjacent battery cells to provide expansion space for the battery cells.

[0024] In one or more of the above optional embodiments, the bottom wall is provided with two limiting parts, and the battery cell module is located between the two limiting parts along the third direction, which is beneficial for the assembly and fixation of the battery cell module in the housing.

[0025] A second aspect of this application provides an electrical device including any of the aforementioned battery packs. Attached Figure Description

[0026] Figure 1 is a three-dimensional structural diagram of a battery pack provided in one embodiment of this application.

[0027] Figure 2 is a three-dimensional exploded view of the battery pack shown in Figure 1.

[0028] Figure 3 is a cross-sectional view of the battery pack structure shown in Figure 1 along line AA.

[0029] Figure 4 is a cross-sectional schematic diagram of a battery pack structure provided in another embodiment of this application.

[0030] Figure 5 is a structural schematic diagram of the first limiting member provided in one embodiment of this application.

[0031] Figure 6 is a structural schematic diagram of the first limiting member provided in another embodiment of this application.

[0032] Figure 7 is a structural schematic diagram of the first limiting member provided in another embodiment of this application.

[0033] Figure 8 is a three-dimensional cross-sectional view of the battery pack shown in Figure 1.

[0034] Figure 9 is a schematic diagram of the structure of the second limiting member shown in Figure 2.

[0035] Figure 10 is an exploded view of the battery cell, circuit board, and second insulating component shown in Figure 2.

[0036] Figure 11 is a schematic diagram of an electrical device provided in one embodiment of this application.

[0037] Explanation of key component symbols:

[0038] Battery pack 100

[0039] Casing 10

[0040] Battery cell module 20

[0041] First limiting component 30

[0042] Second limiting component 40

[0043] Bottom wall 11

[0044] Limiting part 110

[0045] Top wall 12

[0046] Reception cavity 101

[0047] First side wall 13

[0048] Second sidewall 16

[0049] posterior wall 14

[0050] Anterior wall 15

[0051] Handle 151

[0052] Seal 17

[0053] Main body 31

[0054] First fixing part 32

[0055] Installation Department 300

[0056] First Installation Section 33

[0057] First extension section 331

[0058] Second extension section 332

[0059] Second Installation Section 38

[0060] First installation section 381

[0061] Second installation section 382

[0062] Second fixing part 34

[0063] Third fixing part 37

[0064] Reinforcing component 35

[0065] Gap 36

[0066] First mounting hole 330

[0067] Second mounting hole 310

[0068] Part 1, 311

[0069] Part Two 312

[0070] First fastener 301

[0071] Second fastener 302

[0072] Third fastener 303

[0073] first convex portion 131

[0074] Second convex portion 132

[0075] first recess 133

[0076] Second recess 134

[0077] Base 41

[0078] Connecting part 42

[0079] Contact portion 43

[0080] First connecting segment 421

[0081] Second connecting section 422

[0082] First landing section 431

[0083] Second landing section 432

[0084] Gap 401, 10A

[0085] First insulating component 81

[0086] First adhesive component 82

[0087] Second adhesive component 83

[0088] Cell 21

[0089] Cell casing 211

[0090] Electrode terminal 212

[0091] First circuit board 51

[0092] Third insulating component 84

[0093] Second circuit board 52

[0094] Wire harness 60

[0095] First harness 61

[0096] Second harness 62

[0097] Second insulating component 71

[0098] Second buffer 72

[0099] Third buffer 73

[0100] Fourth buffer 74

[0101] 200 electrical appliances

[0102] First direction X

[0103] Second direction Z

[0104] Third direction Y

[0105] The following specific embodiments will further illustrate this application in conjunction with the above-described accompanying drawings. Detailed Implementation

[0106] The following specific embodiments are exemplary and not limiting, and are intended to provide a basic understanding of this application, and are not intended to identify key or decisive elements of this application or limit the scope of protection. As long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

[0107] When a component is considered to be "located" on another component, it can be directly on the other component or may also be interspersed with other components. When a component is considered to be "connected" to another component, it can be directly connected to the other component or may also be interspersed with other components.

[0108] Unless otherwise defined, the term "multiple" in this document, when used to describe the number of components, specifically means that the component is two or more.

[0109] Some embodiments of this application will now be described with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0110] Referring to Figures 1 and 2, one embodiment of this application provides a battery pack 100, including a housing 10. The housing 10 includes a bottom wall 11 and a top wall 12 disposed opposite each other along a second direction Z, and a plurality of side walls disposed between the bottom wall 11 and the top wall 12. The second direction Z is perpendicular to the first direction X. One end of each side wall is connected to the bottom wall 11, and the plurality of side walls surround the bottom wall 11, forming a receiving cavity 101. The top wall 12 is connected to the other end of each side wall and seals the opening of the receiving cavity 101 to seal the receiving cavity 101.

[0111] The multiple sidewalls include a first sidewall 13 and a second sidewall 16 disposed opposite each other along a third direction Y, and a front wall 15 and a rear wall 14 disposed opposite each other along a first direction X. A first limiting member 30 is located between the front wall 15 and the rear wall 14. The third direction Y is perpendicular to the first direction X and the second direction Z. The housing 10 may be, but is not limited to, made of metal.

[0112] In some embodiments, the bottom wall 11, the first side wall 13, the second side wall 16, and the rear wall 14 are integrally formed, the top wall 12 is detachably connected to the plurality of side walls, and the front wall 15 is detachably connected to the first side wall 13, the second side wall 16, the bottom wall 11, and the top wall 12. The detachable top wall 12 and front wall 15 allow components to be installed into the housing 10 from the top wall 12 toward the bottom wall 11, or from the front wall 15 toward the rear wall 14, facilitating the assembly of the battery pack 100.

[0113] In some embodiments, the housing 10 includes a seal 17 surrounding a plurality of sidewalls and located between the sidewalls and the top wall 12. The seal 17 improves the sealing performance of the receiving cavity 101. The seal 17 is connected to the surfaces of the sidewalls facing away from the bottom wall 11 and the surface of the top wall 12 facing the bottom wall 11, and extends toward the center of the receiving cavity 101 to cover a portion of the receiving cavity 101. Compared to the case where the top wall 12 is directly connected to the sidewalls, providing a seal 17 covering a portion of the receiving cavity 101 between the top wall 12 and the sidewalls can increase the connection area between the top wall 12 and the sidewalls, improve the connection strength, and thus improve the sealing performance. It is understood that the seal 17 does not affect the insertion of the component into the housing 10 from the top wall 12 toward the bottom wall 11, and the distance the seal 17 extends toward the center of the receiving cavity 101 can be determined according to the size of the component received in the receiving cavity 101.

[0114] In some embodiments, the front wall 15 is provided with a handle 151 for the user to hold and facilitate the user to move the battery pack 100.

[0115] Referring to Figures 2 and 10, the battery pack 100 includes a cell module 20 disposed within a receiving cavity 101. The cell module 20 includes a plurality of cells 21 stacked along a first direction X. The plurality of cells 21 can be electrically connected in series and / or parallel. Each cell 21 is fixed to a bottom wall 11, which restricts the movement of the cell module 20 within the housing 10 and limits expansion of the cell 21 near the bottom wall 11. Each cell 21 is separately disposed from the top wall 12. In this application, "separately disposed from the top wall 12" means that the cell 21 is not fixedly connected to the top wall 12; a fixed connection includes bonding or fixing to the top wall 12 using screws or other fasteners.

[0116] Please refer to Figures 2 and 10 together. In some embodiments, the battery cell 21 includes a battery cell housing 211, an electrode assembly (not shown), and electrode terminals 212. The electrode assembly is housed within the battery cell housing 211, and the electrode terminals 212 are connected to the electrode assembly and extend out of the battery cell housing 211. In this embodiment, the electrode terminals 212 extend out of the battery cell housing 211 in a third direction Y. Optionally, the battery cell housing 211 includes an aluminum-plastic film, and the battery cell 21 is a pouch cell.

[0117] Please refer to Figures 3 to 7. The battery pack 100 includes a first limiting member 30, which is disposed within the receiving cavity 101 and located on one side of the cell module 20 in the first direction X, between the cell module 20 and the front wall 15. The first limiting member 30 includes a main body 31, which is generally flat. The cell module 20 and the main body 31 are arranged sequentially along the first direction X and abut against the main body 31. The main body 31 is fixedly connected to the bottom wall 11. When the cell module 20 expands, the main body 31 applies pressure to the cell module 20 to limit its expansion. The main body 31 is separately disposed from the top wall 12 and is not fixed to the top wall 12. The fixing methods include bonding, snap-fit ​​connection, welding, or fixing to the top wall 12 with screws or other fasteners. When the battery cell module 20 expands, the side of the main body 31 near the top wall 12 can undergo a certain displacement or deformation along the expansion direction of the battery cell module 20, providing expansion space for the expansion of the battery cell module 20.

[0118] In some embodiments, the main body 31 and the front wall 15 are spaced apart along the first direction X to provide space for movement of the main body 31 in the first direction X. The distance between the main body 31 and the front wall 15 in the first direction X can be determined based on the displacement of the main body 31 during the expansion of the cell module 20.

[0119] Referring to Figures 2 to 4, in some embodiments, the battery pack 100 includes a first insulator 81 disposed between the cell module 20 and the bottom wall 11. By configuring the first insulator 81, the risk of short circuit between the cell module 20 and the bottom wall 11 is reduced.

[0120] In some embodiments, the battery pack 100 includes a first adhesive member 82 and a second adhesive member 83. The first adhesive member 82 adheres to the cell module 20 and the first insulating member 81, and the second adhesive member 83 adheres to the first insulating member 81 and the bottom wall 11. The cell module 20 is fixed to the bottom wall 11 by the adhesive members, which facilitates the assembly of the cell module 20.

[0121] In some embodiments, the first adhesive 82 includes, but is not limited to, adhesives, such as pressure-sensitive adhesives, photosensitive adhesives, etc.

[0122] In some embodiments, the second adhesive 83 includes, but is not limited to, adhesive.

[0123] Referring to Figure 2, in some embodiments, the battery pack 100 includes a second insulating member 71. Along the second direction Z, the second insulating member 71 is disposed between the top wall 12 and the cell module 20, reinforcing the insulation between the top wall 12 and the cell module 20.

[0124] In some embodiments, there is a gap between the first limiting member 30 and the second insulating member 71, so that the first limiting member 30 is separated from the top wall 12.

[0125] Please refer to Figure 4. In some embodiments, the first limiting member 30 is in contact with the second insulating member 71, so that the first limiting member 30 is separated from the top wall 12.

[0126] In some embodiments, the second insulating element 71 includes, but is not limited to, foam, such as ethylene-vinyl acetate copolymer (EVA) foam, neoprene (CR) foam, etc. The second insulating element 71 is configured to provide cushioning for the battery cell module 20. When the battery cell module 20 is subjected to a force in the second direction Z, the second insulating element 71 is compressed, absorbing some of the force and reducing the probability of damage to the battery cell module 20.

[0127] Please refer to Figure 3. In some embodiments, no second insulating member 71 is provided between the first limiting member 30 and the top wall 12, and there is a gap 10A between the first limiting member 30 and the top wall 12, so that the first limiting member 30 and the top wall 12 are separated.

[0128] In some embodiments, the battery pack 100 does not have a second insulating member 71, and there is a gap between the cell 21 and the top wall 12, so that the cell 21 and the top wall 12 are separated.

[0129] In some embodiments, there is a gap between the battery cell 21 and the second insulating member 71, so that the top wall 12 is separated from the battery cell 21; or the battery cell 21 and the second insulating member 71 are in contact, so that the top wall 12 is separated from the battery cell 21.

[0130] In some embodiments, the battery cell 21 is in contact with the second insulator 71 and abuts against the second insulator 71, which helps to restrict the movement of the battery cell 21.

[0131] In some embodiments, the first limiting member 30 includes a first fixing part 32 connected to the main body 31. Along the first direction X, the first fixing part 32 is located on the side of the main body 31 away from the cell module 20, reducing the risk of interference between the first fixing part 32 and the cell module 20. The first fixing part 32 is fixedly connected to the bottom wall 11, fixing the main body 31 relative to the bottom wall 11. The first fixing part 32 is screwed to the bottom wall 11 by a first fastener 301. The first fastener 301 can be a bolt, screw, etc. The first fixing part 32 can also be fixed to the bottom wall 11 by welding, adhesive bonding, or other methods.

[0132] In another embodiment, the main body 31 is directly fixedly connected to the bottom wall 11, for example, the main body 31 and the bottom wall 11 are fixedly connected by welding, bonding or other means.

[0133] In some embodiments, the first limiting member 30 includes a second fixing part 34 and a third fixing part 37. Along the third direction Y, the second fixing part 34 and the third fixing part 37 are located on opposite sides of the main body 31 and connected to the main body 31. Along the first direction X, the second fixing part 34 and the third fixing part 37 are located on the side of the main body 31 away from the cell module 20. The second fixing part 34 is fixed to the second sidewall 16, and the third fixing part 37 is fixed to the first sidewall 13. By providing the second fixing part 34 and the third fixing part 37, the movement of the opposite sides of the main body 31 within the housing 10 in the third direction Y can be restricted, thereby increasing the pressure exerted by the first limiting member 30 on the cell module 20 when it expands, and improving the effect of the first limiting member 30 in restricting the expansion of the cell module 20.

[0134] Please refer to Figure 8. In some embodiments, the second sidewall 16 has a first protrusion 131 facing the second fixing part 34, and the second fixing part 34 is fixed to the first protrusion 131. The first sidewall 13 has a second protrusion 132 facing the third fixing part 37, and the third fixing part 37 is fixed to the second protrusion 132. Along the third direction Y, the first limiting member 30 is located between the first protrusion 131 and the second protrusion 132.

[0135] In some embodiments, a sealing member 17 covering the receiving cavity 101 is provided between the top wall 12 and the side wall. The first protrusion 131 and the second protrusion 132 protrude toward the first limiting member 30, which facilitates the assembly and fixation of the first side wall 13 and the second fixing part 34, and facilitates the assembly and fixation of the second side wall 16 and the third fixing part 37.

[0136] In some embodiments, the second fixing part 34 is screwed to the first protrusion 131 by a second fastener 302, and the third fixing part 37 is screwed to the second protrusion 132 by a third fastener 303. Both the second fastener 302 and the third fastener 303 can be bolts, screws, etc. Optionally, the second fixing part 34 can be fixed to the first protrusion 131 by welding, bonding, snap-fitting, etc., and the third fixing part 37 can be fixed to the second protrusion 132 by welding, bonding, snap-fitting, etc.

[0137] In some embodiments, the first protrusion 131 is formed by stamping a portion of the second sidewall 16, causing that portion of the second sidewall 16 to be recessed from the outside of the receiving cavity 101 toward the inside of the receiving cavity 101. A first recess 133 is formed on the outer surface of the second sidewall 16 opposite to the receiving cavity 101 at a position corresponding to the first protrusion 131. The portion of the second fastener 302 extending outside the housing 10 is accommodated in the first recess 133, which helps to save the overall installation space required for the battery pack 100.

[0138] In some embodiments, the second protrusion 132 is formed by stamping a portion of the first sidewall 13, causing that portion of the first sidewall 13 to be recessed from the outside of the receiving cavity 101 toward the inside of the receiving cavity 101. A second recess 134 is formed at a position on the outer surface of the first sidewall 13 opposite to the receiving cavity 101, corresponding to the second protrusion 132. The portion of the third fastener 303 extending outside the housing 10 is accommodated in the second recess 134, which helps to save the overall installation space required for the battery pack 100.

[0139] In another embodiment, the first protrusion 131 can be provided on the inner surface of the second sidewall 16 facing the receiving cavity 101 by means of welding connection, adhesive connection or the like, and the second protrusion 132 can be provided on the inner surface of the first sidewall 13 facing the receiving cavity 101 by means of welding connection, adhesive connection or the like.

[0140] In some embodiments, the main body 31 includes a first portion 311 and a second portion 312 arranged along a second direction Z, with the first portion 311 connected to the second portion 312. In a third direction Y, the first portion 311 extends beyond the second portion 312. Referring to Figures 5 to 7, along the third direction Y, the first portion 311 extends beyond the second portion 312; in a direction opposite to the third direction Y, the first portion 311 extends beyond the second portion 312.

[0141] In some embodiments, the second fixing part 34 is connected to the first part 311, and the third fixing part 37 is connected to the first part 311. The second fixing part 34 and the third fixing part 37 strengthen the fixation of the first part 311 and the housing 10, which is beneficial to the deformation of the second part 312. The second part 312 is separately disposed from the top wall 12, the first side wall 13 and the second side wall 16. The second part 312 is not fixedly connected to any of the top wall 12, the first side wall 13 and the second side wall 16. When the cell module 20 expands, the second part 312 is more likely to be displaced along the expansion direction of the cell module 20 than the first part 311, thus reserving space for the expansion of the cell module 20.

[0142] In some embodiments, the second fixing portion 34 extends from the first portion 311 in a direction away from the cell module 20, and the third fixing portion 37 extends from the first portion 311 in a direction away from the cell module 20. Optionally, the main body portion 31, the second fixing portion 34, and the third fixing portion 3 are integrally formed, for example, by integral stamping of a metal part.

[0143] In some embodiments, the first fixing part 32 is located between the second fixing part 34 and the third fixing part 37, and the first fixing part 32 is fixed to the second fixing part 34 and the third fixing part 37, which helps to further strengthen the fixation of the first part 311 and the housing 10. For example, the first fixing part 32 and the second fixing part 34 are welded together, and the first fixing part 32 and the third fixing part 37 are welded together.

[0144] In some embodiments, the first portion 311 and the second portion 312 form a notch 36. The notch 36 is for the wire harness to pass through, facilitating the configuration of the wire harness arranged around the periphery of the cell module 20.

[0145] Please refer to Figures 5-7. In some embodiments, the battery pack 100 includes a wiring harness 60 and a mounting portion 300 connected to the second portion 312. Along the first direction X, the mounting portion 300 is located on the side of the main body 31 away from the cell module. The wiring harness 60 passes through the notch 36 and is fixed to the mounting portion 300.

[0146] Referring to Figures 2, 3, 7, and 10, in some embodiments, the battery pack 100 includes a first circuit board 51 disposed within a receiving cavity 101, and a wiring harness 60 including a first wiring harness 61 and a second wiring harness 62. The first circuit board 51 is disposed on the side of the first limiting member 30 facing away from the cell module 20 in a first direction X. The first circuit board 51 is a battery management system (BMS) circuit board. The first wiring harness 61 is a communication harness that transmits electrical signals from the cell 21. The first wiring harness 61 is connected to the first circuit board 51, and the electrical signals include, but are not limited to, voltage, current, and temperature. The second wiring harness 62 can be a power harness used for inputting and outputting electrical energy. The second wiring harness 62 and the first wiring harness 61 pass through a notch 36 and are fixed to the side of the main body 31 facing away from the cell module 20.

[0147] In some embodiments, the first limiting member 30 includes a mounting portion 300 connected to the second portion 312, and the mounting portion 300 is located on the side of the main body 31 away from the battery cell module along the first direction. The second wiring harness 62 and the first wiring harness 61 are fixed to the mounting portion 300, which can reduce the risk of interference between the second wiring harness 62 and the first wiring harness 61 and the edge of the first portion 311 located at the notch 36.

[0148] In some embodiments, referring to FIG7, the mounting portion 300 includes a first mounting portion 38, a first wiring harness 61 connected to a first circuit board 52, and fixed to the first mounting portion 38 by passing through a notch 36 in a first direction.

[0149] In some embodiments, referring to FIG7, the mounting portion 300 includes a portion 33, a second mounting portion 33, and a first mounting portion 38 spaced apart along a second direction Z. The second mounting portion 33 is connected to one end of the second portion 312 opposite to the first portion 311 in the second direction Z. Along the first direction X, the second mounting portion 33 is located on the side of the main body portion 31 away from the cell module 20. The second wiring harness 62 is fixed to the second mounting portion 33, and the first wiring harness 61 is fixed to the first mounting portion 38. The second wiring harness 62 and the first wiring harness 61 are fixed separately, which can reduce the risk of signal interference between the second wiring harness 62 and the first wiring harness 61.

[0150] In some embodiments, the second mounting portion 33 includes a first extension 331 and a second extension 332. The first extension 331 is connected to one end of the second portion 312 that is opposite to the first portion 311 in the second direction Z and extends in a direction opposite to the battery cell module 20. The second extension 332 is connected to the first extension 331 and extends toward the bottom wall 11. The second extension 332 is provided with a first mounting hole 330. During installation, a cable tie is passed through the first mounting hole 330 to secure the second wire harness 62.

[0151] In some embodiments, referring to FIG5, the first mounting portion 38 includes two first mounting segments 381 and one second mounting segment 382. One first mounting segment 381 is connected to the first portion 311, and the other first mounting segment 381 is connected to the second portion 312. The second mounting segment 382 is connected between the two first mounting segments 381 and spaced apart from the first portion 311. The second mounting segment 382 is provided with a second mounting hole 310. During installation, a cable tie is passed through the second mounting hole 310 to secure the first wire harness 61.

[0152] Please refer to Figure 5, which shows another embodiment of the first limiting member 30. The difference between the embodiment shown in Figure 5 and the embodiment shown in Figure 7 is that the mounting part 300 includes a first mounting part 38 and does not have a second mounting part 33. Both the second wire harness 62 and the first wire harness 61 are fixed to the first mounting part 38.

[0153] Please refer to Figure 6, which shows another embodiment of the first limiting member 30. The difference between the embodiment shown in Figure 6 and the embodiment shown in Figure 6 is that the mounting portion 300 includes a second mounting portion 33, and no mounting portion 38 is provided. Both the second wiring harness 62 and the first wiring harness 61 are fixed to the second mounting portion 33. Please refer to Figures 2 and 5. In some embodiments, along the second direction Z, the length of the first portion 311 is L1, and the length of the battery cell is L2, where 1 / 2L2 < L1 < 2 / 3L2, which helps the first limiting member 30 to restrict the expansion of the battery cell 21.

[0154] Referring to Figures 3 and 10, in some embodiments, the battery pack includes a second circuit board 52, which is connected to electrode terminals 212. A portion of the first insulating member 81 is disposed between the first limiting member 30 and the bottom wall 11, reducing the risk of a short circuit between the first limiting member 30 and the bottom wall 11. A portion of the first insulating member 81 is also disposed between the second circuit board 52 and the bottom wall 11, further reducing the risk of a short circuit between the second circuit board 52 and the bottom wall 11.

[0155] Referring to Figures 2 and 10, in some embodiments, the battery pack 100 includes a third insulator 84. The third insulator 84 is disposed on the side of the second circuit board 52 opposite to the cell module 20 and is located between the second circuit board 52 and the first sidewall 13. By configuring the third insulator 84, the risk of a short circuit between the second circuit board 52 and the first sidewall 13 is reduced. In some embodiments, the third insulator 84 covers the entire second circuit board 52.

[0156] Referring to Figure 3, in some embodiments, the battery pack 100 includes a second limiting member 40 disposed within the receiving cavity 101. Along the first direction X, the first limiting member 30 and the second limiting member 40 are respectively disposed on both sides of the cell module 20. The second limiting member 40 abuts against the cell module 20 and is fixed to the rear wall 14. When the cell module 20 expands, the first limiting member 30 and the second limiting member 40 apply pressure to the cell module 20, limiting the expansion of the cell module 20.

[0157] Please refer to Figure 9. The second limiting member 40 includes a base 41 and multiple connecting portions 42. The base 41 is generally flat and is disposed on the side of the cell module 20 facing away from the first limiting member 30 in the first direction X, and abuts against the cell module 20. The multiple connecting portions 42 are disposed on opposite sides of the base 41 in the third direction Y, and are fixed to the rear wall 14. The connecting portions 42 and the rear wall 14 can be fixedly connected by welding, adhesive, or other methods. In this embodiment, there are four connecting portions 42, with two connecting portions 42 on each side of the base 41 in the third direction Y.

[0158] In some embodiments, the connecting portion 42 includes a first connecting segment 421 and a second connecting segment 422. The first connecting segment 421 is connected to the base 41 and extends in a direction away from the cell module 20, and the second connecting segment 422 is connected to the first connecting segment 421 and extends in a direction away from the center of the base 41. The second connecting segment 422 is fixedly connected to the rear wall 14. By configuring the first connecting segment 421, a gap 401 is formed between the base 41 and the rear wall 14. This gap 401 provides expansion space for the expansion of the cell module 20, thereby reducing the risk of excessive internal pressure in the cell module 20.

[0159] Referring to Figures 3 and 9, in some embodiments, the second limiting member 40 includes a plurality of abutment portions 43. The plurality of abutment portions 43 are disposed on opposite sides of the base 41 in the third direction Y, and / or on opposite sides of the base 41 in the second direction Z, and abut against the rear wall 14. In this embodiment, the number of abutment portions 43 is four, wherein two abutment portions 43 are respectively disposed on opposite sides of the base 41 in the second direction Z, two abutment portions 43 are respectively disposed on opposite sides of the base 41 in the third direction Y, and one abutment portion 43 located on the side of the base 31 in the third direction Y is located between two corresponding connecting portions 42.

[0160] In some embodiments, the abutment portion 43 includes a first abutment section 431 and a second abutment section 432. The first abutment section 431 is connected to the base 41 and extends in a direction away from the cell module 20. The second abutment section 432 is connected to the first abutment section 431 and extends toward the center of the base 41. The second abutment section 432 is coplanar with the second connecting section 422 and abuts against the rear wall 14. By configuring the first abutment section 431, a gap 401 is formed between the base 41 and the rear wall 14. This gap 401 provides expansion space for the expansion of the cell module 20, thereby avoiding excessive internal pressure in the cell module 20.

[0161] Referring to Figure 10, in some embodiments, the battery module 20 includes a plurality of second buffers 72. The second buffers 72 are disposed between two adjacent battery cells 21 and are configured to provide expansion space for the battery cells 21. The second buffers 72 provide expansion space for the expansion of the battery cells 21. When the battery cell 21 expands, the second buffers 72 are compressed by the battery cell 21, allowing the battery cell 21 to obtain expandable space, which is beneficial for the expansion of the battery cell 21 during use. The second buffers 72 include, but are not limited to, foam, such as ethylene-vinyl acetate copolymer (EVA) foam, neoprene (CR) foam, etc.

[0162] In some embodiments, each of two adjacent cells 21 is provided with a second buffer 72. In other embodiments, some of two adjacent cells 21 are provided with a second buffer 72.

[0163] Referring to Figure 2, in some embodiments, the battery pack 100 includes two third buffers 73, one of which is disposed between the first limiting member 30 and the cell module 20, and the other of which is disposed between the second limiting member 40 and the cell module 20. The third limiting member 73 is configured to provide expansion space for the cell 21.

[0164] Referring to Figure 2, in some embodiments, there are two cell modules 20, which are spaced apart along a third direction Y. The battery pack 100 includes a fourth buffer 74 disposed between the two cell modules 20. The fourth buffer 74 is configured to provide expansion space for the cell 21.

[0165] In some embodiments, the second insulating element, the third buffer element 73, and the fourth buffer element 74 are made of foam, such as ethylene-vinyl acetate copolymer (EVA) foam, neoprene (CR) foam, etc. Of course, the buffer elements can also be other materials, as long as they can deform under pressure.

[0166] Referring to Figure 2, in some embodiments, the bottom wall 11 has two limiting portions 110 on the surface facing the cell module 20. The two limiting portions 110 extend along a first direction X, and are spaced apart along a third direction Y. Along the third direction Y, the cell module 20 and the second circuit board 52 are located between the two limiting portions 110. The two limiting portions 110 serve to limit the movement of the cell module 20.

[0167] In some embodiments, the first circuit board 51 and the limiting part 110 are fitted with a clearance to facilitate the assembly of the battery cell module 20 and the first circuit board 51 onto the bottom wall 11.

[0168] In some embodiments, the limiting portion 110 is recessed from a portion of the bottom wall 11 into the cell module 20, which is easy to manufacture. In other embodiments, the limiting portion 110 can be fixed to the surface of the bottom wall 11 facing the cell module 20 by means of bonding, welding, or other methods.

[0169] Referring to Figures 5 and 7, in some embodiments, the first limiting member 30 includes multiple reinforcing members 35. The reinforcing members 35 are generally columnar, and the multiple reinforcing members 35 are fixed to the side of the main body 31 opposite to the cell module 20, and are spaced apart along a third direction Y. The reinforcing members 35 are used to increase the strength of the main body 31, raise the main body 31, and limit the expansion capacity of the cell module 20. The reinforcing members 35 can be connected to the first part 311 and / or the second part 312 to increase the strength of the first part 311 and / or the second part 312. The reinforcing members 35 and the main body 31 can be integrally formed or separately formed; this application does not impose any limitations.

[0170] Please refer to Figure 11. One embodiment of this application provides an electrical device 200, including the battery pack 100 described above. The electrical device may be, but is not limited to, automobiles, motorcycles, electric bicycles, bicycles, power tools, large household batteries, etc.

[0171] Those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the spirit and essence of this application fall within the scope of this application's disclosure.

Claims

1. A battery pack, characterized in that, include: A battery cell module includes multiple battery cells stacked along a first direction; The housing includes a bottom wall and a top wall disposed opposite to each other along a second direction, the battery cell module is housed in the housing, the battery cell is fixed to the bottom wall and disposed separately from the top wall, and the second direction is perpendicular to the first direction; The first limiting member includes a main body, the battery cell module and the main body are arranged sequentially along the first direction, the battery cell module abuts against the main body, and the main body is fixed to the bottom wall and separated from the top wall.

2. The battery pack as described in claim 1, characterized in that, The first limiting member includes a first fixing part connected to the main body. Along the first direction, the first fixing part is located on the side of the main body away from the battery cell module and is fixed to the bottom wall.

3. The battery pack as described in claim 2, characterized in that, The first limiting member includes a second fixing part and a third fixing part. Along a third direction, the second fixing part and the third fixing part are connected to opposite sides of the main body. The third direction is perpendicular to the first direction and the second direction. The housing includes a first sidewall and a second sidewall disposed opposite to each other along the third direction, the second fixing part is fixed to the second sidewall, and the third fixing part is fixed to the first sidewall.

4. The battery pack as described in claim 3, characterized in that, The second sidewall is provided with a first protrusion facing the second fixing part, and the second fixing part is fixed to the first protrusion; The first sidewall is provided with a second protrusion facing the third fixing part, and the third fixing part is fixed to the second protrusion.

5. The battery pack as described in claim 3 or 4, characterized in that, The first fixing part is located between the second fixing part and the third fixing part, and the first fixing part is fixed to the second fixing part and the third fixing part.

6. The battery pack according to any one of claims 3-5, characterized in that, The main body includes a first part and a second part. In a third direction, the first part extends beyond the second part, and the second fixing part and the third fixing part are connected to the first part.

7. The battery pack as described in claim 6, characterized in that, The first part and the second part form a gap; The first limiting member includes a mounting portion connected to the second part, and along the first direction, the mounting portion is located on the side of the main body away from the cell module; The battery pack includes a wiring harness that passes through the notch and is secured to the mounting portion.

8. The battery pack as described in claim 7, characterized in that, The housing includes a rear wall and a front wall disposed opposite to each other along the first direction, and the first limiting member is located between the front wall and the rear wall; The mounting portion includes a first mounting portion, and the battery pack includes a first circuit board and a first wiring harness. The first wiring harness is a communication wiring harness, which is connected to the first circuit board and passes through the notch along the first direction and is fixed to the first mounting portion.

9. The battery pack as described in claim 8, characterized in that, The mounting portion includes a second mounting portion, and the first mounting portion and the second mounting portion are spaced apart along the second direction; The battery pack includes a second wiring harness. Along the first direction, the second wiring harness passes through the notch and is fixed to the second mounting portion. The second wiring harness is a power wiring harness.

10. The battery pack according to any one of claims 6-9, characterized in that, Along the second direction, the length of the first portion is L1, and the length of the battery cell is L2, where 1 / 2L2 < L1 < 2 / 3L2.

11. The battery pack according to any one of claims 1-10, characterized in that, The first limiting member includes multiple reinforcing members, which are fixed to the side of the main body away from the battery cell module, and the multiple reinforcing members are spaced apart along a third direction.

12. The battery pack according to any one of claims 1-11, characterized in that, The battery pack includes a second limiting member, and along the first direction, the first limiting member and the second limiting member are respectively disposed on both sides of the cell module; The housing includes a rear wall, and the second limiting member abuts against the battery cell module and is fixed to the rear wall.

13. The battery pack as claimed in claim 12, characterized in that, The second limiting member includes a base and a plurality of connecting portions disposed on the base. The base abuts against the battery cell module, the connecting portions are fixed to the rear wall, and a gap is formed between the base and the rear wall.

14. The battery pack according to any one of claims 1-13, characterized in that, The battery pack includes a first insulating component, a first adhesive component, and a second adhesive component. The first insulating component is disposed between the cell module and the bottom wall. The first adhesive component bonds the cell module and the first insulating component. The second adhesive component bonds the first insulating component and the bottom wall.

15. The battery pack according to any one of claims 1-14, characterized in that, The battery pack includes a second insulating member disposed between the top wall and the cell module along the second direction; Along the second direction, there is a gap between the first limiting member and the second insulating member, or the first limiting member and the second insulating member are in contact connection.

16. The battery pack as claimed in claim 15, characterized in that, There is a gap between the battery cell and the second insulating component, or the battery cell and the second insulating component are in contact connection.

17. The battery pack as claimed in claim 16, characterized in that, The battery cell and the second insulating component abut against each other.

18. The battery pack according to any one of claims 1-17, characterized in that, The battery cell module includes multiple second buffers, which are disposed between two adjacent battery cells.

19. The battery pack according to any one of claims 1-18, characterized in that, The bottom wall is provided with two limiting parts. Along a third direction, the battery cell module is located between the two limiting parts. The third direction is perpendicular to the first direction and the second direction.

20. An electrical appliance, wherein, Includes the battery pack as described in any one of claims 1-19.

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