Battery pack and electric equipment

Abstract

The invention discloses a battery pack and electric equipment, the battery pack comprises a battery cell assembly, a first circuit board, a second circuit board, a buffer piece and a shell, the battery cell assembly comprises a plurality of battery cells, and the battery cells comprise electrode terminals. The electrode terminal is connected with the first circuit board. The second circuit board is electrically connected with the first circuit board, and the first circuit board and the second circuit board are arranged at intervals in the first direction. The buffer piece is arranged between the first circuit board and the second circuit board and fixes the first circuit board and the second circuit board in the first direction. The battery core assembly, the first circuit board, the second circuit board and the buffer piece are arranged in the shell;

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] Battery packs are currently widely used in drones, electric mobility devices, smart energy storage devices, and other applications. Vibration generated by external electrical devices can cause vibrations in the battery pack, leading to movement of components relative to the battery housing, impacting the safety and service life of the battery pack. Summary of the Invention

[0003] In view of this, it is necessary to provide a battery pack and an electrical device that can reduce vibration.

[0004] An embodiment of the present application provides a battery pack, comprising a cell assembly, a first circuit board, a second circuit board, a buffer and a shell, wherein the cell assembly comprises a plurality of cells, and the cells comprise electrode terminals. The electrode terminals are connected to the first circuit board. The second circuit board is electrically connected to the first circuit board, and the first circuit board and the second circuit board are spaced apart along a first direction. The buffer is disposed between the first circuit board and the second circuit board, and fixes the first circuit board and the second circuit board along the first direction. The cell assembly, the first circuit board, the second circuit board and the buffer are disposed in the shell. The positions of the first circuit board and the second circuit board are positioned by the buffer. When the battery pack is in use, external electrical equipment generates vibration on the battery pack, and the buffer reduces the movement of the first circuit board and the second circuit board relative to the shell, thereby playing a vibration reduction role.

[0005] In one or more of the above optional embodiments, the battery pack includes a flexible circuit board that connects the first circuit board and the second circuit board. A buffer is bonded to the first circuit board and the second circuit board, with the buffer and the flexible circuit board located on opposite sides of the first circuit board. Positioning and securing the first and second circuit boards on the same side of the buffer helps reduce the possibility of springback of the flexible circuit board causing positional shifts of the first and second circuit boards, thereby facilitating the securement of the first and second circuit boards.

[0006] In one or more of the above optional embodiments, the battery pack includes a wiring harness, wherein the wiring harness connects to the same side of the first and second circuit boards along the second direction, and the flexible circuit board connects to opposite sides of the first and second circuit boards, with the first direction being perpendicular to the second direction. The wiring harness has a greater bending radius than the flexible circuit board, and the first and second circuit boards are supported by a buffer. The position of the flexible circuit board and wiring harness is adjusted according to the space available, thereby reducing wiring and facilitating a reduction in the space occupied by the battery pack.

[0007] In one or more of the above optional embodiments, the shell includes a lower shell and a top cover, the lower shell includes a bottom wall and a peripheral wall, the bottom wall and the peripheral wall are connected to form a receiving space, the peripheral wall forms a first opening, the battery cell assembly, the first circuit board, the second circuit board and the buffer are arranged in the receiving space through the first opening, and the top cover closes the first opening. A connector is provided on the second circuit board, and a second opening is provided on the bottom wall, and the connector is exposed to the outside of the battery pack from the second opening. When the connector is exposed from the top cover, the connector is usually located at the portion of the top cover that protrudes from the lower shell, and the connector is exposed on the side of the top cover facing the lower shell, resulting in an increase in the space occupied by the top cover. By exposing the connector from the bottom wall, the space occupied by the top cover is reduced, which is conducive to improving the energy density of the battery pack.

[0008] In one or more of the above optional embodiments, the connector is configured to connect to an external electrical device, and the connector is fixed to the bottom wall.

[0009] In one or more optional embodiments above, the first circuit board is separated from the housing, and the second circuit board is separated from the housing, so that during installation, the first circuit board can be pushed into the receiving space for easy assembly.

[0010] In one or more of the above optional embodiments, the buffer member includes a connected support portion, a first limiting portion, and a second limiting portion. Along a first direction, the support portion includes a first surface and a second surface, the first limiting portion protruding downwardly from the first surface, and the second limiting portion protruding upwardly from the second surface. A first circuit board is connected to the first surface and the first limiting portion, and a second circuit board is connected to the second surface and the second limiting portion. Aligning the same sides of the first and second circuit boards, the first and second circuit boards are positioned, and thus the flexible circuit board and wiring harness are positioned, thereby facilitating that the bending curvature of the flexible circuit board remains substantially consistent when it is bent.

[0011] In one or more of the above optional embodiments, the buffer member includes a first adhesive member and a second adhesive member, wherein the first adhesive member adheres to the first surface and the first circuit board, thereby fixing the support portion and the first circuit board. The second adhesive member adheres to the second surface and the second circuit board, thereby fixing the support portion and the second circuit board.

[0012] In one or more optional embodiments above, the battery pack includes two buffers, which are spaced apart along the third direction, and the wiring harness is located between the two buffers, which helps to improve the stability of the buffers in fixing the first circuit board and the second circuit board.

[0013] In one or more of the above optional embodiments, the buffer component includes foam.

[0014] In one or more of the above optional embodiments, the battery pack includes a second support block, which is arranged between the first circuit board and the second circuit board. The second support block connects the first circuit board and the second circuit board, reduces the risk of short circuit caused by contact between the first circuit board and the second circuit board, and has a supporting and buffering effect on the second circuit board.

[0015] In one or more of the above optional embodiments, the first limiting portion faces the surface of the first circuit board and the surface of the second limiting portion facing the second circuit board are flush, so that the first limiting portion and the second limiting portion make the same side of the first circuit board and the second circuit board flush, positioning the first circuit board and the second circuit board, and then positioning the flexible circuit board and the wiring harness, which is conducive to keeping the bending curvature of the flexible circuit board basically consistent when bending.

[0016] In one or more of the above optional embodiments, the bottom wall and the peripheral wall are integrally formed or welded, and the battery cell assembly is pushed into the receiving space from the tail of the battery cell assembly along the first direction, so that the lower shell can be easily set as an integral structure, thereby improving the structural strength of the lower shell and protecting the components installed in the lower shell.

[0017] In one or more of the above optional embodiments, the portion of the first limiting portion protruding from the first surface is provided with a first recess. Along the first direction, the width of the first recess is the same as the thickness of the first circuit board. Part of the first circuit board is provided in the first recess, which reduces the movement of the first circuit board in the first direction and is conducive to further positioning of the first circuit board.

[0018] In one or more of the above optional embodiments, a portion of the second position-limiting portion protruding from the second surface is provided with a second recess. Along the first direction, the width of the second recess is equal to the thickness of the second circuit board. A portion of the second circuit board is provided in the second recess, thereby minimizing movement of the second circuit board in the first direction and facilitating further positioning of the second circuit board.

[0019] An embodiment of the present application provides an electrical device, comprising the battery pack in any one of the above embodiments.

[0020] In one or more of the above optional embodiments, the power-consuming device includes a drone.

[0021] The battery pack and electrical equipment described above use a buffer to position the first circuit board and the second circuit board. When the battery pack is in use, the electrical equipment generates vibration on the battery pack, and the buffer reduces the relative movement of the first circuit board and the second circuit board relative to the housing, thereby playing a vibration reduction role. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagrams of the structure of battery packs in some embodiments are shown.

[0023] Figure 2 An exploded schematic diagram of a battery pack in some embodiments is shown.

[0024] Figure 3 A partial structural schematic diagram of a battery pack in some embodiments is shown.

[0025] Figure 4 A partial structural schematic diagram of a battery pack in some embodiments is shown.

[0026] Figure 5 Shown Figure 4 Schematic diagram of the partial structure of the battery pack from another perspective.

[0027] Figure 6 A partial structural schematic diagram of a battery pack in some embodiments is shown.

[0028] Figure 7 Shown Figure 6 Enlarged structural diagram at point A in the middle.

[0029] Figure 8 Schematic diagrams of the structure of the lower shell in some embodiments are shown.

[0030] Figure 9 A partial cross-sectional schematic diagram of a battery pack in some embodiments is shown.

[0031] Figure 10 Schematic diagrams of the structures of buffer components in some embodiments are shown.

[0032] Figure 11 A simplified schematic diagram of electrical equipment in some embodiments is shown.

[0033] Description of main component symbols: Battery Pack 100 Housing 10 Lower housing 11 bottom wall 11a Peripheral wall 11b Containment Space 101 First opening 102 First supporting block 103 Second opening 111 First fixing hole 112 Top cover 12 Battery cell assembly 20 Battery Cell 21 Electrode terminal 211 Battery cell housing 212 Top wall 212a First sealing portion 212b First circuit board 30 Conductive sheet 31 Total positive conductive sheet 301 Total negative conductive sheet 302 Second circuit board 40 Buffer 50 Support portion 51 First surface 511 Second surface 512 The first limiting portion 52 The second limiting portion 53 First adhesive member 54 Second adhesive member 55 Connector 60 Second fixing hole 61 Flexible circuit board 70 Harness 80 Fastener 100A Electrical equipment 200 First direction X Second direction Y The third direction Z The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0034] 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 the embodiments.

[0035] When a component is referred to as being “disposed on” another component, it can be directly disposed on the other component or there may be a component intervening therebetween. When a component is referred to as being “connected to” another component, it can be directly connected to the other component or there may be a component intervening therebetween.

[0036] When one component is fixed to another component, the fixing method includes but is not limited to snap connection, bonding, abutment, and fastener connection, such as a screw.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] It can be understood that the term "perpendicular" is used to describe the ideal state between two components. In actual production or use, there may be a state between the two components that is approximately perpendicular or equal. For example, combined with numerical descriptions, perpendicular can refer to the angle between two straight lines being in the range of 90°±10°, perpendicular can also refer to the dihedral angle between two planes being in the range of 90°±10°, and perpendicular can also refer to the angle between a straight line and a plane being in the range of 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.

[0039] Unless otherwise defined, the term "plurality" herein, when used to describe the number of components, specifically means that the components are two or more.

[0040] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features of the embodiments may be combined with each other.

[0041] See also Figures 1 to 7 An embodiment of the present application provides a battery pack 100 including a housing 10 and a cell assembly 20 , wherein the cell assembly 20 is disposed in the housing 10 . The cell assembly 20 includes a plurality of cells 21 , each cell 21 including an electrode terminal 211 .

[0042] In some embodiments, the battery pack 100 includes a first circuit board 30 . The first circuit board 30 is disposed in the housing 10 . The first circuit board 30 is connected to the electrode terminals 211 .

[0043] In some embodiments, the battery pack 100 includes a second circuit board 40 disposed in the housing 10. The second circuit board 40 is electrically connected to the first circuit board 30. The first circuit board 30 and the second circuit board 40 are spaced apart along the first direction X.

[0044] In some embodiments, the battery pack 100 includes a buffer 50 disposed in the housing 10. The buffer 50 is disposed between the first circuit board 30 and the second circuit board 40 and fixes the first circuit board 30 and the second circuit board 40 along the first direction X.

[0045] The present application uses a buffer member 50 to locate the positions of the first circuit board 30 and the second circuit board 40. When the battery pack 100 is in use, external electrical equipment generates vibrations on the battery pack 100. The buffer member 50 reduces the movement of the first circuit board 30 and the second circuit board 40 relative to the shell 10, thereby playing a vibration reduction role.

[0046] Optionally, the first circuit board 30 includes a printed circuit board (PCB).

[0047] Optionally, the second circuit board 40 includes a printed circuit board (PCB), and a BMS component (Battery Management System) is provided on the second circuit board 40. The BMS component includes multiple electronic components, which can realize functions such as control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 21.

[0048] See also Figure 1 and Figure 8 In some embodiments, the housing 10 includes a lower housing 11, which includes a bottom wall 11a and a peripheral wall 11b. The bottom wall 11a connects to the peripheral wall 12b to form a receiving space 101, and the peripheral wall 12b encloses a first opening 102. The battery cell assembly 20, the first circuit board 30, the second circuit board 40, and the buffer member 50 are disposed in the receiving space 101 through the first opening 102.

[0049] In some embodiments, the bottom wall 11a and the peripheral wall 12b are integrally formed or welded. Welding refers to the process of welding the bottom wall 11a and the peripheral wall 13b together before the battery cell assembly 20 is assembled into the lower housing 11. By pushing the battery cell assembly 20 into the receiving space 101 from the rear end along the first direction X, the lower housing 11 is easily configured as a monolithic structure, improving the structural strength of the lower housing 11 and facilitating protection of the components installed therein.

[0050] In some embodiments, the housing 10 includes a top cover 12, which is connected to the peripheral wall 12b and closes the first opening 102. Optionally, the top cover 12 and the peripheral wall 12b are connected by a snap-fit ​​connection. Optionally, the top cover 12 and the peripheral wall 12b are connected by screws.

[0051] In some embodiments, a connector 60 is provided on the second circuit board 40, and a second opening 111 is provided on the bottom wall 11a. The connector 60 is exposed from the second opening 111 to the outside of the battery pack 100. When the connector 60 is exposed from the top cover 12, the connector 60 is typically located in the portion of the top cover 12 that protrudes from the lower housing 11, and the connector 60 is exposed on the side of the top cover 12 facing the lower housing 11, resulting in an increase in the space occupied by the top cover 12. In the present application, by exposing the connector 60 from the bottom wall 11a, the space occupied by the top cover 12 is reduced, which helps to improve the energy density of the battery pack 100.

[0052] In some embodiments, the connector 60 is configured to connect to an external electrical device. The connector 60 is fixed to the bottom wall 11a.

[0053] See also Figure 9In some embodiments, the bottom wall 11a has a first fixing hole 112, the connector 60 has a second fixing hole 61, and the battery pack 100 includes a fastener 100A. The fastener 100A passes through the second fixing hole 61 and connects to the first fixing hole 112 to securely connect the connector 60 to the bottom wall 11a. Optionally, the fastener 100A includes a screw.

[0054] When the battery pack 100 falls, the force applied to the connector 60 will be transmitted to the second circuit board 40 and then to the first circuit board 30 through the second circuit board 40. The buffer 50 can buffer the force and reduce damage to the first circuit board 30 and the second circuit board 40.

[0055] In some embodiments, cushioning member 50 includes foam.

[0056] In some embodiments, see Figure 5 In some embodiments, the battery pack 100 includes a flexible circuit board 70 , which connects the first circuit board 30 and the second circuit board 40 . Optionally, the electrical energy of the battery cell assembly 20 is transferred to the second circuit board 40 through the flexible circuit board 70 .

[0057] In some embodiments, the flexible circuit board 70 is in a bent state. One end of the flexible circuit board 70 is soldered to the side of the first circuit board 30 facing the second circuit board 40, and the other end is soldered to the side of the second circuit board 40 facing away from the first circuit board 30, which helps simplify the assembly process.

[0058] In some embodiments, the buffer member 50 is bonded to the first circuit board 30 and the second circuit board 40. The buffer member 50 and the flexible circuit board 70 are located on opposite sides of the first circuit board 30. The buffer member 50 positions and secures the first circuit board 30 and the second circuit board 40 on the same side, thereby reducing the possibility of springback of the flexible circuit board 70 causing the positions of the first circuit board 30 and the second circuit board 40 to change, thereby facilitating the securement of the positions of the first circuit board 30 and the second circuit board 40.

[0059] In some embodiments, the buffer member 50 is located on the side where the flexible circuit board 70 is located and is bonded to the first circuit board 30 and the second circuit board 40 , which helps to further reduce the resilience of the flexible circuit board 70 .

[0060] See also Figure 6 and Figure 7In some embodiments, the battery pack 100 includes a wiring harness 80. Along the second direction Y, the wiring harness 80 connects the first and second circuit boards 30 and 40 on the same side, while the flexible printed circuit board 70 connects the first and second circuit boards 30 and 40 on the opposite, same side. The bending radius of the wiring harness 80 is greater than the bending radius of the flexible printed circuit board 70. The first and second circuit boards 30 and 40 are supported by the buffer 50. The positions of the flexible printed circuit board 70 and wiring harness 80 are adjusted based on the space available, reducing wiring and facilitating space reduction for the battery pack 100. The first direction X is perpendicular to the second direction Y.

[0061] In some embodiments, the wiring harness 80 is configured to transmit signals, including but not limited to information such as the temperature, current, voltage, and resistance of the battery cell 21 .

[0062] In some embodiments, the battery pack 100 includes two buffers 50 spaced apart along the third direction Z. The wiring harness 80 is positioned between the two buffers 50, which helps improve the stability of the buffers 50 in securing the first circuit board 30 and the second circuit board 40. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0063] See also Figure 5 In some embodiments, the battery cell 21 includes a battery cell housing 212 and an electrode assembly (not shown). The electrode assembly is disposed within the battery cell housing 212, and the electrode terminal 211 is connected to the electrode assembly and extends out of the battery cell housing 212. Optionally, the battery cell 21 is a soft-pack battery cell. Optionally, the battery cell 21 is a hard-shell battery cell.

[0064] In some embodiments, the cell housing 212 includes a top wall 212a and a first sealing portion 212b. The first sealing portion 212b is connected to the top wall 212a, and the electrode terminals 211 extend from the first sealing portion 212b. The electrode terminals 211 pass through the first circuit board 30. The electrode terminals 211 of adjacent cells 21 are bent and stacked and connected to the side of the first circuit board 30 facing away from the cell housing 212.

[0065] In some embodiments, the first circuit board 30 includes a conductive sheet 31 , and the electrode terminals 211 of adjacent battery cells 21 are bent and stacked and welded to the conductive sheet 31 .

[0066] See also Figure 5 and Figure 6 In some embodiments, the first circuit board 30 includes a total positive conductive sheet 301 and a total negative conductive sheet 302 , the flexible circuit board 70 is electrically connected to the second circuit board 40 and the total positive conductive sheet 301 , and the flexible circuit board 70 is electrically connected to the second circuit board 40 and the total negative conductive sheet 302 .

[0067] See also Figure 7In some embodiments, the battery pack 100 includes a first support block 103, which is disposed between the top wall 212a and the first circuit board 30. The first support block 103 connects the top wall 212a and the first circuit board 30. Optionally, the first support block 103 is disposed on the top walls 212a of two adjacent battery cells 21. Optionally, the first support block 103 includes foam.

[0068] In some embodiments, the battery pack 100 includes a second support block (not shown). The second support block is disposed between the first circuit board 30 and the second circuit board 40. The second support block connects the first circuit board 30 and the second circuit board 40, reduces the risk of short circuits caused by contact between the first circuit board 30 and the second circuit board 40, and provides support and cushioning for the second circuit board 40. Optionally, the second support block includes foam.

[0069] See also Figure 3 In some embodiments, the first circuit board 30 is separated from the shell 10, wherein separation means that there is an air gap between the first circuit board 30 and the shell 10, and the first circuit board 30 is not connected to the shell 10. During installation, it is convenient to push the first circuit board 30 into the receiving space 101 for easy assembly.

[0070] See also Figure 3 In some embodiments, the second circuit board 40 is separated from the housing 10. Separation means that there is an air gap between the second circuit board 4 and the housing 10, and the second circuit board 4 is not connected to the housing 10. This facilitates the second circuit board 40 to be pushed into the receiving space 101 during installation, facilitating assembly.

[0071] In some embodiments, the first circuit board 30 is separated from the peripheral wall 12 b , and the second circuit board 40 is separated from the peripheral wall 12 b .

[0072] See also Figure 7 and Figure 10 In some embodiments, the buffer member 50 includes a support portion 51 , and along the first direction X, the support portion 51 includes a first surface 511 and a second surface 512 . The support portion 51 is located between the first circuit board 30 and the second circuit board 40 .

[0073] In some embodiments, the buffer member 50 includes a first limiting portion 52, and the first limiting portion 52 is connected to the supporting portion 51. Figure 7 The first limiting portion 52 protrudes downward from the first surface 511 along a direction opposite to the first direction X. The first circuit board 30 is connected to the first surface 511 and the first limiting portion 52 .

[0074] In some embodiments, the buffer member 50 includes a second limiting portion 53, and the second limiting portion 53 is connected to the supporting portion 51. Figure 7Along the first direction X, the second limiting portion 53 protrudes upward from the second surface 512, and the second circuit board 40 is connected to the second surface 512 and the second limiting portion 53. The first limiting portion 52 and the second limiting portion 53 are used to locate the positions of the first circuit board 30 and the second circuit board 40, facilitating assembly.

[0075] In some embodiments, the first limiting portion 52 faces the surface of the first circuit board 30 and the second limiting portion 53 faces the surface of the second circuit board 40, so that the first limiting portion 52 and the second limiting portion 53 make the same side of the first circuit board 30 and the second circuit board 40 flush, positioning the first circuit board 30 and the second circuit board 40, and then positioning the flexible circuit board 70 and the wiring harness 80, which is conducive to keeping the bending curvature of the flexible circuit board 70 basically consistent when bending.

[0076] In some embodiments, along the first direction X, one end of the second limiting portion 53 protruding from the second surface 512 is flush with the second circuit board 40, or lower than the surface of the second circuit board 40 facing away from the first circuit board 30, thereby reducing interference with components on the surface of the second circuit board 40 and reducing contact between the second limiting portion 53 and the housing 10 during installation, thereby facilitating assembly.

[0077] In some embodiments, along a direction opposite to the first direction X, one end of the first limiting portion 52 protrudes from the first surface 511 and protrudes from the surface of the first circuit board 30 away from the second circuit board 40 , which is beneficial for positioning the first circuit board 30 and the second circuit board 40 .

[0078] In some embodiments, the portion of the first limiting portion 52 protruding from the first surface 511 is provided with a first recess (not shown). Along the first direction X, the width of the first recess is the same as the thickness of the first circuit board 30. Part of the first circuit board 30 is provided in the first recess, which reduces the movement of the first circuit board 30 in the first direction X, and is conducive to further positioning of the first circuit board 30.

[0079] In some embodiments, the portion of the second stopper 53 protruding from the second surface 512 is provided with a second recess (not shown). Along the first direction X, the width of the second recess is equal to the thickness of the second circuit board 40 . The portion of the second circuit board 40 disposed within the second recess reduces movement of the second circuit board 40 in the first direction X, facilitating further positioning of the second circuit board 40 .

[0080] In some embodiments, the buffer member 50 includes a first adhesive member 54, which adheres the first surface 511 to the first circuit board 30 and fixes the support portion 51 to the first circuit board 30. The first adhesive member 54 includes but is not limited to double-sided tape.

[0081] In some embodiments, the buffer 50 includes a second adhesive 55, which adheres the second surface 512 to the second circuit board 40 and fixes the support portion 51 to the second circuit board 40. The second adhesive 55 includes but is not limited to double-sided tape.

[0082] See also Figure 11 , the present application provides an assembling method of the battery pack 100 in any one of the above embodiments, comprising the following steps; Step 1: The battery cell assembly 20 is connected to the first circuit board 30, and the flexible circuit board 70 is bent and fixed by the buffer 50 so that the first circuit board 30 and the second circuit board 40 are flush on the same side to form a battery pack component 110; Step 2: Push the battery pack component 110 into the lower housing 11 from the first opening 102 and extend the connector 60 out of the second opening 111 ; Step 3: Connect the top cover 12 to the lower housing 11 to close the first opening 102 .

[0083] In some embodiments, step 1 specifically includes arranging multiple battery cells 21 along the third direction Z, welding the electrode terminals 211 to the conductive sheets 31 of the first circuit board 30, bonding the buffer 50 to the first circuit board 30, then flipping the second circuit board 40 so that it is positioned above the first circuit board 30 and bonding it to the buffer 50, connecting the first circuit board 30 to the first stop 52, and connecting the second circuit board 40 to the second stop 53, and connecting the collection harness 80 to the first circuit board 30 and the second circuit board 40 to form the battery pack assembly 110.

[0084] In some embodiments, step 2 specifically includes pushing the battery pack component 110 from the tail of the battery cell assembly 20 into the lower shell 11 from the first opening 102, and separating the first circuit board 30 from the shell 10, separating the second circuit board 40 from the shell 10, and extending the connector 60 from the second opening 111, and fixing the connector 60 to the bottom wall 11a by the fastener 100A.

[0085] The above assembly method will facilitate the inverted installation of the battery pack component 110 into the lower shell 11, reducing the risk of squeezing the head of the battery cell 21 and causing damage to the battery cell 21, and facilitating the setting of the lower shell 11 as an integral structure, thereby improving the structural strength of the lower shell 11, and being beneficial to protecting the components installed in the lower shell 11. The connector 60 is exposed from the bottom wall 11a, reducing the space occupied by the top cover 12, and being beneficial to improving the energy density of the battery pack 100.

[0086] See also Figure 11 The present application also provides an electric device 200 using at least one of the above-mentioned battery packs 100. The electric device 200 includes an electric device body, and the battery pack 100 is electrically connected to the electric device body.

[0087] In one embodiment, the electrical device 200 of the present application may be, but is not limited to, electronic equipment, drones, backup power supplies, electric vehicles, electric motorcycles, electric power-assisted bicycles, electric tools, etc.

[0088] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present application and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments fall within the scope disclosed in the present application.

Claims

1. A battery pack, characterized in that: include: A battery cell assembly, comprising a plurality of battery cells, each of which includes electrode terminals; a first circuit board, the electrode terminals being connected to the first circuit board; a second circuit board, electrically connected to the first circuit board, wherein the first circuit board and the second circuit board are spaced apart along a first direction; a buffer member, the buffer member being disposed between the first circuit board and the second circuit board and fixing the first circuit board and the second circuit board along the first direction; A shell, wherein the battery core assembly, the first circuit board, the second circuit board and the buffer are arranged in the shell.

2. The battery pack according to claim 1, wherein: The battery pack includes a flexible circuit board, wherein the flexible circuit board connects the first circuit board and the second circuit board; The buffer component is bonded to the first circuit board and the second circuit board, and the buffer component and the flexible circuit board are located on opposite sides of the first circuit board.

3. The battery pack according to claim 2, wherein: The battery pack includes a wiring harness connecting the first circuit board and the second circuit board on the same side along a second direction, and the flexible circuit board connects the first circuit board and the second circuit board on the opposite side. The first direction is perpendicular to the second direction.

4. The battery pack according to any one of claims 1 to 3, wherein: The housing includes a lower housing and a top cover, the lower housing includes a bottom wall and a peripheral wall, the bottom wall and the peripheral wall are connected to form a receiving space, the peripheral wall forms a first opening, the battery cell assembly, the first circuit board, the second circuit board and the buffer are arranged in the receiving space through the first opening, and the top cover closes the first opening; A connector is provided on the second circuit board, and a second opening is provided on the bottom wall. The connector is exposed to the outside of the battery pack through the second opening.

5. The battery pack according to claim 4, wherein: The connector is configured to connect to an external electrical device, and the connector is fixed to the bottom wall.

6. The battery pack according to any one of claims 1 to 5, wherein: The first circuit board is separated from the housing, and the second circuit board is separated from the housing.

7. The battery pack according to any one of claims 1 to 6, wherein: The buffer member includes a supporting portion, a first limiting portion, and a second limiting portion connected to each other. Along the first direction, the supporting portion includes a first surface and a second surface. The first limiting portion protrudes downward from the first surface, and the second limiting portion protrudes upward from the second surface. The first circuit board connects the first surface and the first limiting portion, and the second circuit board connects the second surface and the second limiting portion.

8. The battery pack according to claim 7, wherein: The buffer member includes a first adhesive member and a second adhesive member. The first adhesive member is bonded to the first surface and the first circuit board, and the second adhesive member is bonded to the second surface and the second circuit board.

9. An electrical device, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 8.

10. The electrical equipment according to claim 9, characterized in that: The electrical equipment includes a drone.

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