Battery pack and electric equipment

Abstract

The invention discloses a battery pack and electric equipment. The battery pack comprises a shell, a structural part, a battery cell assembly, a first bonding part, a top cover, a connector, a wire harness and a second bonding part, the structural member is arranged on the shell and forms an accommodating space with the shell. The battery core assembly is arranged in the accommodating space; the first bonding piece is arranged in the accommodating space and is used for bonding the battery cell assembly, the shell and the structural piece; the top cover is detachably connected to the shell. The connector is detachably connected to the top cover, and the connector is configured to be connected with external equipment. The wire harness is electrically connected with the cell assembly and the connector, the structural member is provided with an opening, and the wire harness penetrates through the opening. The opening is filled with the second bonding piece, and the second bonding piece is connected with the wire harness and the structural piece, so that the top cover and / or the connector can be replaced conveniently, and the battery pack can be maintained conveniently.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery pack and electrical equipment. Background Art

[0002] At present, battery packs are widely used in electric vehicles, electric two-wheeled vehicles, intelligent energy storage equipment and other fields. The top cover of the battery pack is generally equipped with a connector to connect external devices. Improper use during plugging and transportation can easily cause the connector and top cover to be damaged. It is not easy to replace the connector or top cover of the conventional one-piece glue-filled battery pack. Summary of the invention

[0003] In view of this, it is necessary to provide a battery pack and an electrical device that facilitates replacement of the top cover and / or the connector.

[0004] An embodiment of the present application provides a battery pack, including a shell, a structural member, a battery cell assembly, a first adhesive member, a top cover, a connector, a wiring harness, and a second adhesive member. The structural member is arranged in the shell and forms a storage space with the shell. The battery cell assembly is arranged in the storage space. The first adhesive member is arranged in the storage space, and the first adhesive member bonds the battery cell assembly, the shell, and the structural member. The top cover is detachably connected to the shell. The connector is detachably connected to the top cover, and the connector is configured to connect an external device. The wiring harness electrically connects the battery cell assembly and the connector, and the structural member is provided with an opening, and the wiring harness is passed through the opening. The second adhesive member fills the opening and connects the wiring harness and the structural member. The battery cell assembly, the shell, and the structural member are bonded and connected by the first adhesive member, and the battery cell assembly is encapsulated in the storage space, thereby improving the sealing performance of the battery cell assembly and reducing the influence of removing the top cover on the sealing of the battery pack. The top cover is detachably connected to the shell, and the connector is detachably connected to the top cover, so that the top cover and / or the connector can be replaced, and the battery pack can be repaired.

[0005] In one or more optional embodiments above, the structural member includes a base and an extension wall, the extension wall is connected to the base and extends in a direction from the base to the battery cell assembly, and the base and the extension wall form a receiving cavity. The battery pack includes a first circuit board, the first circuit board is arranged in the receiving cavity, the first circuit board is connected to the battery cell assembly, and the wiring harness is connected to the first circuit board.

[0006] In one or more of the above optional embodiments, the first circuit board and the base are arranged along a first direction. Along the first direction, the height of the first adhesive is lower than the surface of the first circuit board facing the base, reducing the influence of the first adhesive on the components on the first circuit board, and is higher than the surface of the extension wall away from the base, so as to facilitate bonding of the extension wall and the side wall by the first adhesive.

[0007] In one or more of the above optional embodiments, the wiring harness is detachably connected to the surface of the first circuit board facing the base, so as to facilitate the removal of the wiring harness.

[0008] In one or more of the above optional embodiments, the shear strength of the second adhesive is 0.1 MPa-1.2 MPa, which facilitates peeling the second adhesive from the opening and disassembling the wiring harness.

[0009] In one or more of the above optional embodiments, the material of the second adhesive component includes silicone gel.

[0010] In one or more of the above optional embodiments, the shear strength of the second adhesive member is smaller than the shear strength of the first adhesive member.

[0011] In one or more of the above optional embodiments, the shell includes a side wall, the top cover includes a connecting wall, the side wall is connected to the connecting wall, and the second adhesive is arranged between the side wall and the connecting wall, which is beneficial to increase the sealing of the battery pack and facilitate the disassembly of the top cover and the shell.

[0012] In one or more of the above optional embodiments, the side wall includes a first end face, the first end face is provided with a connecting protrusion, the connecting wall includes a second end face, the second end face is provided with a connecting recess, the connecting protrusion is arranged in the connecting recess, and the second adhesive is arranged between the connecting protrusion and the connecting recess, which is beneficial to increase the sealing of the battery pack and facilitate the disassembly of the top cover and the shell.

[0013] In one or more optional embodiments above, the base includes a surface facing the top cover, and the surface forms a recess. The top cover includes a fixing protrusion, which is located in the recess and connected to the shell, which is conducive to reducing the height of the battery pack and improving space utilization.

[0014] In one or more of the above optional embodiments, along the first direction, the first end face exceeds the highest surface of the base, reducing the first adhesive component from exceeding the first end face. The first adhesive component bonds the first end face to the second end face, making it difficult to disassemble the top cover and the shell, thereby facilitating the disassembly of the top cover and the shell.

[0015] The present application provides an electrical device, comprising a battery pack according to any one of the above embodiments.

[0016] The above-mentioned battery pack and electrical equipment are bonded to the cell assembly, shell and structural parts through the first adhesive, and the cell assembly is encapsulated in the accommodating space, thereby improving the sealing performance of the cell assembly and reducing the influence of removing the top cover on the sealing of the battery pack. The top cover is detachably connected to the shell, and the connector is detachably connected to the top cover, which facilitates replacement of the top cover and / or connector and facilitates maintenance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a battery pack in some embodiments is shown.

[0018] Figure 2 A schematic diagram of a battery pack explosion in some embodiments is shown.

[0019] Figure 3 Shows Figure 1 Cross-sectional view along III-III.

[0020] Figure 4 Some embodiments are shown Figure 3 A magnified schematic diagram of center A.

[0021] Figure 5 Schematic diagrams of the structures of some embodiments are shown.

[0022] Figure 6 Schematic diagrams of the structures of the structural members and the top cover in some embodiments are shown.

[0023] Figure 7 Shows Figure 1 Cross-sectional view along II-II.

[0024] Figure 8 A simplified schematic diagram of electrical equipment in some embodiments is shown.

[0025] Description of main component symbols: Battery Pack 100 Accommodation Space 101 Fasteners 102 Housing 10 Bottom wall 11 Side wall 12 First side wall 12a Second side wall 12b The third side wall 12c Fourth side wall 12d The first end surface 121 Connecting protrusion 121a The first fixing hole 122 Structural parts 20 Accommodating chamber 20a Opening 21 First opening 211 Second opening 212 Base 22 Extension wall 23 The first extension wall 231 The second extension wall 232 The third extension wall 233 Fourth extension wall 234 Surface 221 Recess 222 Projection 223 Battery cell assembly 30 Battery Cell 31 Battery shell 311 Electrode terminal 312 First adhesive member 40 Top cover 50 Connecting wall 51 Second end surface 511 Connecting recess 511a Fixed protrusion 52 The second fixing hole 521 Connector 60 First connector 61 Second connector 62 Harness 70 First power harness 71 Second power harness 72 Sampling Harness 73 Second adhesive member 80 First circuit board 90 First direction X Second direction Y The third direction Z Electrical equipment 200 The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0027] When a component is considered to be “provided on” another component, it can be directly provided on the other component or there may be a component in between. When a component is considered to be “connected to” another component, it can be directly connected to the other component or there may be a component in between.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0029] It can be understood that the term "perpendicular" is used to describe an ideal state between two components. In actual production or use, there may be a state that is approximately perpendicular or equal to each other between the two components. For example, in combination with numerical descriptions, perpendicularity can refer to the angle between two straight lines being between 90°±10°, perpendicularity can also refer to the dihedral angle between two planes being between 90°±10°, and perpendicularity can also refer to the angle between a straight line and a plane being between 90°±10°. The two components described as "perpendicular" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if the overall extension direction is a straight line or a plane.

[0030] Unless otherwise defined, when the term "plurality" is used to describe the number of components, it specifically means that the components are two or more.

[0031] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0032] See also Figures 1 to 3 An embodiment of the present application provides a battery pack 100 including a shell 10 and a structural member 20 . The structural member 20 is disposed in the shell 10 and forms a receiving space 101 with the shell 10 .

[0033] In some embodiments, the battery pack 100 includes a battery cell assembly 30 and a first adhesive 40 , the battery cell assembly 30 and the first adhesive 40 are disposed in the accommodating space 101 , and the first adhesive 40 adhesively connects the battery cell assembly 30 , the shell 10 and the structural member 20 .

[0034] In some embodiments, the battery pack 100 includes a top cover 50 and a connector 60, the top cover 50 is detachably connected to the housing 10, the connector 60 is detachably connected to the top cover 50, and the connector 60 is configured to connect to an external device. Optionally, the connector 60 is configured to connect to an external power-consuming device. Optionally, the connector 60 is configured to connect to an external charging device.

[0035] In some embodiments, the battery pack 100 includes a wiring harness 70 , which electrically connects the battery cell assembly 30 and the connector 60 . The structural member 20 is provided with an opening 21 , and the wiring harness 70 is passed through the opening 21 .

[0036] In some embodiments, the battery pack 100 includes a second adhesive member 80 , which fills the opening 21 and connects the wire harness 70 and the structural member 20 .

[0037] The present application uses a first adhesive member 40 to bond and connect the battery cell assembly 30, the shell 10 and the structural member 20, and encapsulates the battery cell assembly 30 in the accommodating space 101, thereby improving the sealing performance of the battery cell assembly 30 and reducing the impact of removing the top cover 50 on the sealing of the battery pack 100. The top cover 50 is detachably connected to the shell 10, and the connector 60 is detachably connected to the top cover 50, which facilitates replacement of the top cover 50 and / or the connector 60 and maintenance of the battery pack 100.

[0038] In some embodiments, the housing 10 includes a bottom wall 11 and a side wall 12 connected to the bottom wall 11, and the bottom wall 11 and the side wall 12 form a receiving space. The structural member 20 is disposed in the receiving space, and the first adhesive member 40 is adhesively connected to the structural member 20 and the side wall 12 to form a closed receiving space 101, insulate and seal the battery cell assembly 30, and reduce the impact of removing the top cover 50 on the sealing of the battery pack 100.

[0039] In some embodiments, the bottom wall 11 and the structural member 20 are arranged along a first direction X. The side wall 12 includes a first side wall 12a, a second side wall 12b, a third side wall 12c, and a fourth side wall 12d. The first side wall 12a and the second side wall 12b are connected to the bottom wall 11 and are arranged in the second direction Y. The third side wall 12c and the fourth side wall 12d are connected to the bottom wall 11 and are arranged in the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0040] See also Figures 2 to 5 In some embodiments, the structural member 20 includes a base 22, and the opening 21 is provided in the base 22. The opening 21 penetrates the base 22 along the thickness direction of the base 22.

[0041] In some embodiments, the structural member 20 includes an extension wall 23 , which is connected to the base 22 and extends in a direction from the base 22 to the battery cell assembly 30 . The base 22 and the extension wall 23 form a receiving cavity 20 a .

[0042] In some embodiments, the first adhesive member 40 is adhesively connected to the extension wall 23 and the side wall 12 .

[0043] In some embodiments, the structural member 20 includes a first circuit board 90 , which is disposed in the receiving cavity 20 a , connected to the battery cell assembly 30 , and the wiring harness 70 is connected to the first circuit board 90 .

[0044] In some embodiments, the extension wall 23 includes a first extension wall 231, a second extension wall 232, a third extension wall 233, and a fourth extension wall 234. The first extension wall 231 and the second extension wall 232 are arranged along the second direction Y, and the third extension wall 233 and the fourth extension wall 234 are arranged along the third direction Z. The first extension wall 231 connects the third extension wall 233 and the fourth extension wall 234, and the second extension wall 232 connects the third extension wall 233 and the fourth extension wall 234. The first extension wall 231, the second extension wall 232, the third extension wall 233, and the fourth extension wall 234 are connected to the base 22 to form a receiving cavity 20a.

[0045] In some embodiments, the first extension wall 231 is bonded to the first side wall 12a by the first adhesive 40. The second extension wall 232 is bonded to the second side wall 12b by the first adhesive 40. The third extension wall 233 is bonded to the third side wall 12c by the first adhesive 40. The fourth extension wall 234 is bonded to the fourth side wall 12d by the first adhesive 40.

[0046] In some embodiments, the battery cell assembly 30 includes a plurality of stacked battery cells 31, the battery cell 31 includes a battery cell housing 311, an electrode assembly and an electrode terminal 312, the electrode assembly is disposed in the battery cell housing 311, and the electrode terminal 312 is connected to the electrode assembly and extends out of the battery cell housing 311. The electrode terminal 312 is connected to the first circuit board 90.

[0047] Optionally, the first circuit board 90 includes a BMS component (Battery Management System), which includes multiple electronic components. The multiple electronic components can realize functions such as control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 21.

[0048] Optionally, the first circuit board 90 includes a flexible printed circuit (FPC). Optionally, the first circuit board 90 includes a printed circuit board (PCB).

[0049] In some embodiments, the first circuit board 90 and the base 22 are arranged along the first direction X. Along the first direction X, the height of the first adhesive 80 is lower than the surface of the first circuit board 90 facing the base 22, thereby reducing the impact of the first adhesive 80 on the components on the first circuit board 90.

[0050] In some embodiments, along the first direction X, the height of the first adhesive member 80 is higher than the surface of the extension wall 23 away from the base 22 , so that the extension wall 23 and the side wall 12 can be bonded together by the first adhesive member 80 .

[0051] See also Figure 3 and Figure 4 In some embodiments, the top cover 50 includes a connecting wall 51, the side wall 12 is connected to the connecting wall 51, and the second adhesive member 80 is disposed between the side wall 12 and the connecting wall 51, which is beneficial to increase the sealing of the battery pack 100 and facilitate the disassembly of the top cover 50 and the shell 10.

[0052] In some embodiments, the side wall 12 includes a first end face 121, the first end face 121 is provided with a connecting protrusion 121a, the connecting wall 51 includes a second end face 511, the second end face 511 is provided with a connecting recess 511a, the connecting protrusion 121a is provided in the connecting recess 511a, and the second adhesive 80 is provided between the connecting protrusion 121a and the connecting recess 511a, which is beneficial to increase the sealing of the battery pack 100 and facilitate the disassembly of the top cover 50 and the shell 10.

[0053] See also Figure 3 In some embodiments, along the first direction X, the first end face 121 exceeds the highest surface of the base 22, reducing the first adhesive 40 from exceeding the first end face 121. The first adhesive 40 bonds the first end face 121 and the second end face 511, making it difficult to disassemble the top cover 50 and the shell 10, thereby facilitating the disassembly of the top cover 50 and the shell 10.

[0054] See also Figures 5 to 7 In some embodiments, the base 22 includes a surface 221 facing the top cover 50, and the surface 221 forms a recess 222. The top cover 50 includes a fixing protrusion 52, which is located in the recess 222 and connected to the housing 10, which is beneficial to reducing the height of the battery pack 100 and improving space utilization.

[0055] In some embodiments, the battery pack 100 includes a fastener 102 , the side wall 12 is provided with a first fixing hole 122 , the fixing protrusion 52 is provided with a second fixing hole 521 , and the fastener 102 connects the first fixing hole 122 and the second fixing hole 521 , so that the top cover 50 is connected to the shell 10 .

[0056] In some embodiments, a protrusion 223 is formed on the surface 221, and along the first direction X, the projection of the protrusion 223 is separated from the projection of the connection position between the first circuit board 90 and the electrode terminal 312, and the opening 21 is provided at the protrusion 223 to reduce the interference between the wiring harness 70 and the electrode terminal 312.

[0057] See also Figure 2 In some embodiments, the wiring harness 70 is detachably connected to the surface of the first circuit board 90 facing the base 22 .

[0058] In some embodiments, the connection between the wire harness 70 and the first circuit board 90 is exposed at the opening 21 , so as to facilitate the removal of the wire harness 70 from the first circuit board 90 .

[0059] See also Figure 2 In some embodiments, the connector 60 includes a first connector 61, and the harness 70 includes a first power harness 71 and a second power harness 72. The first power harness 71 and the second power harness 72 are used to transmit electric energy to the first connector 61, and the first connector 61 is exposed from the top cover 50. The opening 21 includes two first openings 211, the first power harness 71 extends from one of the first openings 211 and is connected to the first connector 61, and the second power harness 72 extends from the other first opening 211 and is connected to the first connector 61. The second adhesive 80 is filled in the first opening 211, and connects the first power harness 71, the second power harness 72 and the base 22.

[0060] In some embodiments, the connection between the first power harness 71 and the second power harness 72 and the first circuit board 90 is exposed in the first opening 211. Optionally, the first power harness 71 is plug-connected to the first circuit board 90. Optionally, the second power harness 72 is plug-connected to the first circuit board 90.

[0061] In some embodiments, the connector 60 includes a second connector 62, and the harness 70 includes a sampling harness 73, which is used to collect and transmit signals such as temperature, voltage, current, and resistance of the battery cell assembly 30. The second connector 62 is exposed from the top cover 50. The opening 21 includes a second opening 212, and the sampling harness 73 is connected to the first circuit board 90. The sampling harness 73 extends from the second opening 212 and is connected to the second connector 62. The second adhesive 80 is filled in the second opening 212 and connects the sampling harness 73 and the base 22.

[0062] In some embodiments, the connection between the sampling harness 73 and the first circuit board 90 is exposed at the first opening 211. The connection between the sampling harness 73 and the first circuit board 90, the connection between the first power harness 71 and the first circuit board 90, and the connection between the second power harness 72 and the first circuit board 90 are all exposed at the first opening 211. In some embodiments, the connection between the sampling harness 73 and the first circuit board 90 is exposed at the second opening 212. Optionally, the harness 70 and the first circuit board 90 are connected by plugging.

[0063] In some embodiments, the shear strength of the second adhesive 80 is 0.1 MPa-1.2 MPa, which facilitates peeling the second adhesive 80 from the opening 21 and disassembling the wiring harness 70 .

[0064] Optionally, the shear strength of the second adhesive 80 may be in a range of any one of 0.1 MPa, 0.2 MPa, 0.3 MPa, 0.4 MPa, 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, 1.0 MPa, 1.1 MPa, and 1.2 MPa, or any two of the range.

[0065] In some embodiments, the material of the second adhesive component includes silicone gel.

[0066] In some embodiments, the shear strength of the second adhesive 80 is less than the shear strength of the first adhesive 40 .

[0067] In some embodiments, the shear strength of the first adhesive 40 is 18 MPa-28 MPa, which is conducive to bonding the battery cell assembly 30 , the shell 10 and the structural member 20 , and improving the sealing of the battery pack 100 .

[0068] Optionally, the shear strength of the first adhesive 40 may be in a range consisting of any one of 18 MPa, 19 MPa, 20 MPa, 21 MPa, 22 MPa, 23 MPa, 24 MPa, 25 MPa, 26 MPa, 27 MPa, and 28 MPa, or any two of the range.

[0069] In some embodiments, the first adhesive member 40 is formed by curing an insulating material, and the material of the first adhesive member 40 includes epoxy resin.

[0070] In some embodiments, when assembling the battery pack 100, the battery cell assembly 30 and the first circuit board 90 are first connected and placed in the shell 10, the insulating material is injected into the shell 10, and the structural member 20 is placed in the shell 10, so that the extension wall 23 and the side wall 12 are bonded by the insulating material. After the insulating material is cured, the battery cell assembly 30 and the first circuit board 90 are sealed in the accommodating space 101.

[0071] See also Figure 8 The present application also provides an electric device 200 using the above-mentioned battery pack 100. In one embodiment, the electric device 200 of the present application can be, but is not limited to, electronic equipment, drones, backup power supplies, electric vehicles, electric motorcycles, electric power-assisted bicycles, electric tools, large household battery modules, etc.

[0072] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not used as limitations on the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A battery pack, characterized in that: include: case; A structural member, disposed on the housing and forming a receiving space with the housing; A battery cell assembly is arranged in the accommodation space; A first adhesive member is disposed in the accommodation space, and the first adhesive member bonds the battery cell assembly, the housing, and the structural member; A top cover, detachably connected to the shell; A connector, detachably connected to the top cover, wherein the connector is configured to connect to an external device; A wiring harness electrically connecting the battery core assembly and the connector, the structural member is provided with an opening, and the wiring harness is passed through the opening; The second adhesive fills the opening and connects the wiring harness and the structural member.

2. The battery pack according to claim 1, characterized in that: The structural member comprises a base and an extension wall, wherein the extension wall is connected to the base and extends in a direction from the base to the battery core assembly, and the base and the extension wall form a receiving cavity; The battery pack includes a first circuit board, which is disposed in the accommodating cavity, the first circuit board is connected to the battery cell assembly, and the wiring harness is connected to the first circuit board.

3. The battery pack according to claim 2, characterized in that: The first circuit board and the base are arranged along a first direction. Along the first direction, the height of the first adhesive is lower than a surface of the first circuit board facing the base and higher than a surface of the extension wall facing away from the base.

4. The battery pack according to claim 3, characterized in that: The wiring harness is detachably connected to a surface of the first circuit board facing the base.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The shear strength of the second adhesive is 0.1 MPa-1.2 MPa.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The material of the second adhesive component includes silicone gel.

7. The battery pack according to any one of claims 1 to 6, characterized in that: The shear strength of the second adhesive component is smaller than the shear strength of the first adhesive component.

8. The battery pack according to claim 5, characterized in that: The shell includes a side wall, the top cover includes a connecting wall, the side wall is connected to the connecting wall, and the second adhesive member is arranged between the side wall and the connecting wall.

9. The battery pack according to claim 8, characterized in that: The side wall includes a first end face, the first end face is provided with a connecting protrusion, the connecting wall includes a second end face, the second end face is provided with a connecting recess, the connecting protrusion is arranged in the connecting recess, and the second adhesive is arranged between the connecting protrusion and the connecting recess.

10. The battery pack according to claim 9, characterized in that: The base includes a surface facing the top cover, the surface forming a recess; The top cover includes a fixing protrusion, which is located in the recess and connected to the shell.

11. The battery pack according to claim 10, characterized in that: Along the first direction, the first end surface exceeds the highest surface of the base.

12. An electrical device, characterized in that: Comprising a battery pack as claimed in any one of claims 1 to 11.

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