Battery pack and electric equipment

Abstract

The invention provides a battery pack and electric equipment. The battery pack comprises a box body and a cover body, a cavity is formed in the box body, the cover body is connected with the box body and seals the cavity to form a storage cavity, the storage cavity is configured to store a battery module, and a supporting part is arranged on the inner wall of the cover body; the battery module comprises at least two single cells and a CCS assembly, the CCS assembly comprises a plurality of chips and electric connecting pieces, the chips are electrically connected with the single cells, and the electric connecting pieces are electrically connected with the chips; the chips are fixedly connected with the single battery cells, and the electric connecting pieces are fixedly connected with the supporting parts. Therefore, a CCS support does not need to be designed in the battery pack, the internal structure of the box body can be simplified, and the cost of the battery pack is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery pack and an electric device. BACKGROUND

[0002] The battery box usually comprises a lower box body and an upper cover, the battery module is arranged in the lower box body, and a CCS (Cell Contact System) assembly and a circuit board and the like are further arranged in a receiving cavity enclosed by the lower box body and the upper cover. The CCS assembly comprises a bar sheet, an electrical connecting piece and the like, and is used for connecting a plurality of single cells in the battery module and connecting the battery module and the circuit board. In the related art, the CCS assembly further comprises a bracket, and the bar sheet, the electrical connecting piece and the like are mounted on the bracket and fixed through the bracket. The setting of the bracket leads to a complex internal structure of the battery box and a high cost. SUMMARY

[0003] Embodiments of the present application provide a battery pack and an electric device, which can perform welding and the like on the inside of the battery box through the opening on the cover after the cover is closed on the box, and seal the opening by using the sealing cover plate after the welding is completed, so as to realize the sealing of the battery box and at least partially solve the above technical problems.

[0004] In a first aspect, embodiments of the present application provide a battery pack, comprising: a box body configured with a cavity; a cover connected with the box body and sealing the cavity to form a receiving cavity, the receiving cavity being configured to receive a battery module; an inner wall of the cover being provided with a support portion; the battery module comprising at least two single cells and a CCS assembly, the CCS assembly comprising a plurality of bar sheets and electrical connecting pieces, the bar sheets being electrically connected with the single cells, and the electrical connecting pieces being electrically connected with the bar sheets; the bar sheets being fixedly connected with the single cells, and the electrical connecting pieces being fixedly connected with the support portion.

[0005] Thus, the CCS bracket does not need to be designed in the battery pack, the structure inside the box can be simplified, and the cost of the battery pack can be reduced.

[0006] In an embodiment, the CCS assembly is not provided with a bracket.

[0007] Thus, the CCS bracket does not need to be designed in the battery pack, the structure inside the box can be simplified, and the cost of the battery pack can be reduced.

[0008] In an embodiment, the CCS assembly further comprises an electrical connecting wire, and the electrical connecting pieces are electrically connected with the bar sheets through the electrical connecting wire.

[0009] Thus, the electrical connection between the electrical connecting pieces and the bar sheets is realized.

[0010] In an embodiment, the electric connecting wire is a flexible wire.

[0011] Thus, the length and extension direction of the electric connecting wire can be adjusted, and the electric connecting member can be fixed on the supporting part.

[0012] In an embodiment, the axial direction of the single battery cell is perpendicular to the height direction of the box body, the single battery cell comprises two end faces at both axial ends and a side face connected to the two end faces, the tab is welded and fixed to the positive or negative electrode of the end face, the electric connecting member is arranged on the side face, and the electric connecting member is spaced apart from the side face.

[0013] Thus, the electric connection and fixed connection between the tab and the single battery cell are realized.

[0014] In an embodiment, the supporting part is connected to the side wall of the cover body, and the supporting part is arranged between the single battery cell and the electric connecting member in a protruding manner relative to the side wall of the cover body, and the electric connecting member is mounted on a side of the supporting part away from the single battery cell.

[0015] Thus, the electric connecting member and the side face of the single battery cell are arranged in a spaced apart manner.

[0016] In an embodiment, further comprising a circuit board arranged on a side of the battery module facing the cover body; the electric connecting member is arranged between the single battery cell and the circuit board; the electric connecting member comprises a plurality of first electric connecting terminals arranged on a side facing the circuit board; the circuit board is provided with a plurality of first electric connecting holes corresponding to the plurality of first electric connecting terminals, and the first electric connecting terminals are inserted into the corresponding first electric connecting holes to electrically connect the circuit board and the electric connecting member.

[0017] Thus, the position of the circuit board can be positioned, the fixation of the circuit board has smaller connecting stress, and the electric connection between the two is realized.

[0018] In an embodiment, further comprising a first welding part located on a side of the circuit board away from the electric connecting member, and the first welding part is arranged corresponding to the first electric connecting terminals and the first electric connecting holes to weld and fix the first electric connecting terminals and the first electric connecting holes.

[0019] Thus, the electric connecting member and the circuit board are fixedly connected.

[0020] In an embodiment, further comprising a plurality of supporting parts; the plurality of supporting parts are arranged in the receiving cavity, and the circuit board is fixedly connected to the supporting parts.

[0021] Therefore, the CCS support is not needed to fix the circuit board in the battery box, the structure inside the box can be simplified, and the cost of the battery pack is reduced.

[0022] In an embodiment, the plurality of supports comprises a first support; the first support is integrally injection molded with the cover.

[0023] Therefore, the first support can be reliably connected with the cover.

[0024] In an embodiment, the material of the first support is conductive material; the first support has a first end and a second end, the first end is electrically connected with the circuit board; The side of the cover away from the receiving cavity is also provided with an output pole, the output pole is electrically connected with the second end, and the output pole is electrically connected with the circuit board through the first support.

[0025] Therefore, the electrical connection between the output pole and the circuit board is realized.

[0026] In an embodiment, the first support and the output pole are an integral structure.

[0027] Therefore, the first support can be reliably connected with the output pole.

[0028] In an embodiment, the first end comprises a plurality of second electrical connection terminals, the circuit board is provided with a plurality of second electrical connection holes corresponding to the plurality of second electrical connection terminals, the second electrical connection terminals are inserted into the corresponding second electrical connection holes to electrically connect the circuit board with the first support.

[0029] Therefore, the fixation of the circuit board has smaller connection stress.

[0030] In an embodiment, a second welding part is further included; the second welding part is located on the side of the circuit board away from the first support, and the second welding part is correspondingly arranged with the second electrical connection terminals and the second electrical connection holes to weld and fix the second electrical connection terminals and the second electrical connection holes.

[0031] Therefore, the welding and electrical connection between the first support and the circuit board are realized.

[0032] In an embodiment, the plurality of supports comprises a second support; the material of the second support is conductive material, the second support comprises a third end and a fourth end, the third end is electrically connected with the circuit board, and the fourth end is electrically connected with one of the single cells in the battery module; The plurality of tabs includes a first tab for connecting between the two single cells and a second tab for connecting the single cell and the circuit board; and the second support is multiplexed as the second tab.

[0033] Therefore, the internal structure of the box is simplified, and the cost is reduced.

[0034] In an embodiment, the third end includes a plurality of third electric connection terminals, the circuit board is provided with a plurality of third electric connection holes corresponding to the plurality of third electric connection terminals, and the third electric connection terminals are inserted into the corresponding third electric connection holes to electrically connect the circuit board and the second support.

[0035] Therefore, the fixing of the circuit board has smaller connection stress.

[0036] In an embodiment, a third welding part is further included; the third welding part is located on a side of the circuit board away from the second support, and the third welding part is provided corresponding to the third electric connection terminals and the third electric connection holes to weld and fix the third electric connection terminals and the third electric connection holes.

[0037] Therefore, the electric connection part and the second support are fixedly connected.

[0038] In an embodiment, the cover is provided with an opening, and the cover includes a sealing cover plate covering the opening. The opening is located above the circuit board, and the circuit board falls within the orthographic projection of the opening on the plane where the circuit board is located.

[0039] Therefore, the circuit board inside the box can be welded through the opening on the cover, and the assembly and formation of the components on the circuit board are facilitated.

[0040] In an embodiment, the distance between the edge of the circuit board and the wall surface of the opening is D, and 5 mm≤D≤10 mm is satisfied.

[0041] Therefore, it is ensured that the circuit board can be installed in the receiving cavity from the opening, and the circuit board has a large enough area.

[0042] In a second aspect, an embodiment of the present application provides a power-using device including the battery pack as described above.

[0043] Therefore, it is not necessary to design a CCS support in the battery pack, the internal structure of the box can be simplified, and the cost of the battery pack is reduced.

[0044] The beneficial effects of the embodiments of the present application are as follows: In the embodiment of the present application, by fixedly connecting the baffle to the single battery cell and fixedly connecting the electrical connector to the support part of the shell, the CCS support in the battery pack can be designed without, the structure inside the box can be simplified, and the cost of the battery pack can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0046] Figure 1 is one of the structural schematic diagrams of the battery pack provided by the embodiment of the present application; Figure 2 is an exploded view of Figure 1 ; Figure 3 is a structural schematic diagram of the tooling provided by the embodiment of the present application; Figure 4 is an exploded view of Figure 3 ; Figure 5 is a second structural schematic diagram of the battery pack provided by the embodiment of the present application; Figure 6 is a top view of the battery pack when the sealing cover plate is not assembled by the embodiment of the present application; Figure 7 is a structural schematic diagram of the battery module and the circuit board provided by the embodiment of the present application.

[0047] Explanation of reference signs: 1, box; 11, receiving cavity; 2, cover; 21, opening; 22, sealing cover plate; 23, support part; 3, battery module; 31, single battery cell; 311, end face; 312, side face; 4, CCS assembly; 41, baffle; 411, first baffle; 412, second baffle; 42, electrical connecting wire; 43, electrical connector; 431, first electrical connecting terminal; 5, circuit board; 51, first electrical connecting hole; 52, first welding part; 53, second electrical connecting hole; 54, second welding part; 55, third electrical connecting hole; 56, third welding part; 6, tooling; 7, support part; 71, first support part; 711, second electrical connecting terminal; 72, second support part; 721, third electrical connecting terminal; 8, output pole. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to 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 of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the drawing direction in the drawings; and "inner" and "outer" refer to the outline of the device.

[0049] The embodiments of the present application provide a power consuming device. The power consuming device includes a battery pack. The power consuming device includes an energy storage device, a vehicle, an electrical appliance with a battery, etc.

[0050] The embodiments of the present application provide a battery pack. The battery pack includes a box body 1, a cover body 2, and a battery module 3 arranged in the box body 1. The box body 1 is configured with a cavity. The cover body 2 is connected with the box body 1 and closes the cavity to form a receiving cavity 11, and the receiving cavity 11 is configured to receive the battery module 3. The battery module 3 includes at least two single battery cells 31. The receiving cavity 11 of the battery box is used to provide a containing space for the single battery cells 31, and the battery box can adopt various structures.

[0051] In the battery pack, the single battery cells 31 can be multiple. The multiple single battery cells 31 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple single battery cells 31 are connected in series and in parallel. The multiple single battery cells 31 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple single battery cells 31 is contained in the battery box. Of course, the battery pack can also be that the multiple single battery cells 31 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and the whole is contained in the battery box. The battery pack can also include other structures, for example, the battery pack can also include a busbar component for realizing the electrical connection between the multiple single battery cells 31.

[0052] Each single battery cell 31 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The single battery cell 31 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0053] As shown in FIGS. 1, 2, 3, 4, 5, and 6, in some embodiments, at least two single battery cells 31 are configured to be assembled to form the battery module 3 in a tool 6. Figure 3 Figure 4 As shown in FIGS. 1, 2, 3, 4, 5, and 6, in some embodiments, at least two single battery cells 31 are configured to be assembled to form the battery module 3 in a tool 6. ​

[0054] It can be understood that the at least two single battery cells 31 are assembled to form the battery module 3 in the tooling 6, and then the battery module 3 is installed in the receiving cavity 11 of the battery box as a whole, so that the battery module 3 is quickly assembled.

[0055] It should be noted that the at least two single battery cells 31 are assembled to form the battery module 3 on the tooling 6, and after the formed battery module 3 is taken out from the tooling 6 and placed in the receiving cavity 11 of the battery box, the tooling 6 does not need to be put into the box.

[0056] The tooling 6 is formed with an assembly groove, and the at least two single battery cells 31 can form the battery module 3 in the assembly groove. The shape of the assembly groove is matched with the shape of the receiving cavity 11.

[0057] As shown in FIGS. Figure 2 and Figure 5 In some embodiments, the inner wall of the cover 2 is provided with a support portion 23. The battery module 3 includes at least two single battery cells 31 and a CCS assembly 4, the CCS assembly 4 includes a plurality of springs 41 and an electrical connector 43, the springs 41 are electrically connected with the single battery cells 31, and the electrical connector 43 is electrically connected with the springs 41. The springs 41 are fixedly connected with the single battery cells 31, and the electrical connector 43 is fixedly connected with the support portion 23.

[0058] In the embodiments of the present application, the springs 41 are fixedly connected with the single battery cells 31, and the electrical connector 43 is fixedly connected with the support portion 23 of the shell, so that the CCS support does not need to be designed in the battery pack, the structure inside the box 1 can be simplified, and the cost of the battery pack is reduced.

[0059] It can be understood that the electrical connector 43 is fixed by the support portion 23 on the inside of the cover 2, and the springs 41 are fixed by the single battery cells 31 themselves, so that the CCS support does not need to be designed, the internal structure of the battery box is simplified, and the cost is reduced.

[0060] In some embodiments, the support portion 23 is integrally formed with the cover 2. For example, the support portion 23 is integrally injection molded with the cover 2. The support portion 23 can be spaced apart and provided as two, and the opposite ends of the electrical connector 43 are fixed to the upper surfaces of the two support portions 23.

[0061] In some embodiments, the support portion 23 is provided in a sheet shape and arranged above the battery module 3 in a horizontal state, so that the electrical connector 43 can be fixed above the battery module 3.

[0062] In some embodiments, the CCS assembly 4 is not provided with a support.

[0063] It can be understood that the CCS assembly 4 is not provided with a support, so that the CCS support does not need to be designed in the battery pack, the structure inside the box 1 can be simplified, and the cost of the battery pack is reduced.

[0064] Since the CCS assembly 4 is not provided with a support, the weight and production cost of the CCS assembly 4 can be significantly reduced, and the CCS support does not need to be designed for the battery pack, so that the design cost can also be reduced, and the development cycle is shortened.

[0065] As shown in Figure 5 In some embodiments, the CCS assembly 4 further comprises an electric connecting wire 42, and the electric connecting piece 43 is electrically connected with the tab 41 through the electric connecting wire 42.

[0066] It can be understood that the electric connecting piece 43 and the tab 41 can be electrically connected through the electric connecting wire 42.

[0067] In some embodiments, the electric connecting wire 42 is a flexible wire.

[0068] It can be understood that since the electric connecting wire 42 is a flexible wire, the length and extension direction of the electric connecting wire 42 can be adjusted to avoid interference with the assembly of the electric connecting piece 43, and the electric connecting piece 43 can be fixed on the support portion 23.

[0069] As shown in Figure 1 and Figure 2 In some embodiments, the axial direction of the single battery cell 31 is perpendicular to the height direction of the box 1, the single battery cell 31 comprises two end faces 311 at both ends in the axial direction and a side face 312 connected between the two end faces 311, the tab 41 is welded and fixed with the positive or negative electrode of the end face 311, the electric connecting piece 43 is arranged on the side face 312, and the electric connecting piece 43 is arranged in a spaced manner with the side face 312.

[0070] It can be understood that the axial direction of the single battery cell 31 is perpendicular to the height direction of the box 1, so that the single battery cell 31 is placed horizontally in the box 1. The two end faces 311 at both ends in the axial direction are circular faces. The side face 312 connected between the two end faces 311 is a cylindrical face. One of the two end faces 311 is a positive electrode end face 311, and the other is a negative electrode end face 311. The tab 41 is welded on the positive electrode end face 311 or the negative electrode end face 311 to achieve the welding and fixing of the tab 41 with the positive or negative electrode of the end face 311. In this way, the electric connection and fixed connection of the tab 41 and the single battery cell 31 are achieved. The electric connecting piece 43 is arranged on the side face 312, and the electric connecting piece 43 is arranged in a spaced manner with the side face 312, so as to prevent the electric connecting piece 43 from directly contacting the single battery cell 31 to cause a safety hazard.

[0071] As shown in Figure 5As shown, in some embodiments, the support portion 23 is connected to the side wall of the cover body 2, and the support portion 23 is arranged protrudingly between the single battery cell 31 and the electrical connector 43, and the electrical connector 43 is mounted on the side of the support portion 23 away from the single battery cell 31.

[0072] It can be understood that the support portion 23 is arranged protrudingly between the single battery cell 31 and the electrical connector 43, and the electrical connector 43 is mounted on the side of the support portion 23 away from the single battery cell 31, so that the support portion 23 can isolate the electrical connector 43 and the single battery cell 31, and the electrical connector 43 and the side surface 312 of the single battery cell 31 are arranged spacedly.

[0073] In some embodiments, the support portion 23 is integrally formed on the side wall of the cover body 2. The support portion 23 can also be arranged spacedly from the side surface 312 of the single battery cell 31, thereby further increasing the distance between the electrical connector 43 and the single battery cell 31, and improving the safety of charging and discharging of the battery pack. At the same time, the electrical connector 43 and the support portion 23 are fixed by screws or rivets, and the support portion 23 is arranged spacedly from the side surface 312 of the single battery cell 31 to prevent the screws or rivets from piercing the single battery cell 31 during assembly of the electrical connector 43, thereby causing safety hazards.

[0074] Please continue to refer to Figure 5 In some embodiments, the battery module 3 further comprises a circuit board 5 arranged on the side of the battery module 3 facing the cover body 2; the electrical connector 43 is arranged between the single battery cell 31 and the circuit board 5; the electrical connector 43 comprises a plurality of first electrical connection terminals 431 arranged on the side facing the circuit board 5; the circuit board 5 is provided with a plurality of first electrical connection holes 51 corresponding to the plurality of first electrical connection terminals 431, and the first electrical connection terminals 431 are inserted into the corresponding first electrical connection holes 51 to electrically connect the circuit board 5 and the electrical connector 43.

[0075] It can be understood that the electrical connector 43 is arranged between the single battery cell 31 and the circuit board 5, and the electrical connector 43 is inserted into the plurality of first electrical connection holes 51 of the circuit board 5 through the plurality of first electrical connection terminals 431, which can position the circuit board 5 and realize electrical connection between the two. At the same time, this connection method has smaller connection stress, which is beneficial to the stability of the connection.

[0076] The circuit board 5 is a circuit board 5 of the BMS, and the circuit board 5 is electrically connected to the single battery cell 31 through the electrical connector 43, the electrical connection wire 42 and the tab 41, so as to collect the electrical parameters of the single battery cell 31 and realize battery management.

[0077] For example, the electrical connector 43 is provided with seven first electrical connection terminals 431 on the side facing the circuit board 5. The circuit board 5 is provided with seven first electrical connection holes 51 corresponding to the seven first electrical connection terminals 431. Each first electrical connection terminal 431 is inserted into a corresponding first electrical connection hole 51, thereby achieving electrical connection between the circuit board 5 and the electrical connector 43.

[0078] As shown in FIG. 1, in some embodiments, the first soldering part 52 is provided on the side of the circuit board 5 away from the electrical connector 43, and the first soldering part 52 is provided corresponding to the first electrical connection terminals 431 and the first electrical connection holes 51 to solder and fix the first electrical connection terminals 431 and the first electrical connection holes 51. Figure 6 As can be understood, the first soldering part 52 is provided on the first electrical connection terminals 431 and the first electrical connection holes 51 to solder and fix the first electrical connection terminals 431 and the first electrical connection holes 51, thereby achieving fixed connection between the electrical connector 43 and the circuit board 5. The first soldering part 52 is a first soldering part. Each first electrical connection terminal 431 and each first electrical connection hole 51 is provided with a corresponding first soldering part 52.

[0079] The first soldering part 52 is provided on the side of the circuit board 5 away from the electrical connector 43. After the cover 2 is covered on the box 1, the circuit board 5 can be assembled into the receiving cavity 11 through the opening 21 of the cover 2. After the circuit board 5 is positioned and pre-fixed by the plurality of first electrical connection terminals 431, the side of the circuit board 5 away from the electrical connector 43 is soldered to form the first soldering part 52. The first electrical connection terminals 431 and the first electrical connection holes 51 are soldered and fixed by the first soldering part 52 to achieve soldering and electrical connection between the electrical connector 43 and the circuit board 5.

[0080] As shown in FIG. 1, in some embodiments, the plurality of support members 7 are provided in the receiving cavity 11, and the circuit board 5 is fixedly connected with the support members 7.

[0081] Figure 5 As can be understood, the plurality of support members 7 are provided in the receiving cavity 11 to further support the circuit board 5, thereby eliminating the need to provide a CCS support member to fix the circuit board 5 in the battery box, simplifying the structure inside the box 1, and reducing the cost of the battery pack.

[0082] In some embodiments, the plurality of support members 7 include a first support member 71, and the first support member 71 is integrally injection molded with the cover 2.

[0083] In some embodiments, the plurality of support members 7 include a first support member 71, and the first support member 71 is integrally injection molded with the cover 2.

[0084] ​It can be understood that the first support 71 is integrally injection molded on the cover 2, so that the first support 71 can form a reliable connection with the cover 2. Since the first support 71 is fixed with the cover 2, the first support 71 can also fix the circuit board 5, so that the CCS support for fixing the circuit board 5 in the battery box is not needed, the structure inside the box 1 can be simplified, and the cost of the battery pack is reduced.

[0085] As shown in Figure 5 In some embodiments, the first support 71 is made of an electrically conductive material; the first support 71 has a first end and a second end, the first end is electrically connected with the circuit board 5; the side of the cover 2 away from the receiving cavity 11 is also provided with an output pole post 8, the output pole post 8 is electrically connected with the second end, and the output pole post 8 is electrically connected with the circuit board 5 through the first support 71.

[0086] It can be understood that the first support 71 is made of an electrically conductive material, so that it can conduct electricity and have an electrical connection function. The first end of the first support 71 is electrically connected with the circuit board 5, and the second end of the first support 71 is electrically connected with the output pole post 8, so that the electrical connection between the output pole post 8 and the circuit board 5 is realized by using the first support 71. Since the circuit board 5 is electrically connected with the single cell 31 through the gasket 41, the electrical connection line 42 and the electrical connecting piece 43, the electrical connection between the output pole post 8 and the single cell 31 is realized, and the external charging and discharging of the single cell 31 is realized.

[0087] In some embodiments, two first supports 71 are provided. The first ends of the two first supports 71 are electrically connected with the circuit board 5. The second end of one of the first supports 71 is electrically connected with the positive pole post, and the second end of the other first support 71 is electrically connected with the negative pole post.

[0088] In some embodiments, the first support 71 and the output pole post 8 are an integral structure.

[0089] It can be understood that the first support 71 and the output pole post 8 are integrally formed, and the two are integrally injection molded on the cover 2. Thus, the first support 71 can form a reliable connection with the output pole post 8, wherein the output pole post 8 is exposed on the outside of the cover 2, and the first support 71 is exposed on the inside of the cover 2.

[0090] For example, the first support 71 and the output pole post 8 are integrally cast formed, or the first support 71 and the output pole post 8 are integrally stamped formed.

[0091] As shown in Figure 6As shown, in some embodiments, the first end includes a plurality of second electrical connection terminals 711, and the circuit board 5 is provided with a plurality of second electrical connection holes 53 corresponding to the plurality of second electrical connection terminals 711. The second electrical connection terminals 711 are inserted into the corresponding second electrical connection holes 53 to electrically connect the circuit board 5 to the first support member 71.

[0092] Understandably, by inserting multiple second electrical connection terminals 711 into multiple second electrical connection holes 53 on the circuit board 5, the position of the circuit board 5 can be determined, and the electrical connection between the two can be achieved. At the same time, this connection method has lower connection stress, which is beneficial to the stability of the connection.

[0093] For example, the first end of the first support member 71 has five second electrical connection terminals 711 spaced apart on the side facing the circuit board 5. The circuit board 5 has five correspondingly spaced second electrical connection holes 53. Each second electrical connection terminal 711 is inserted into a corresponding second electrical connection hole 53, thereby realizing the electrical connection between the circuit board 5 and the first support member 71.

[0094] like Figure 6 As shown, in some embodiments, a second welding portion 54 is also included; the second welding portion 54 is located on the side of the circuit board 5 away from the first support member 71, and the second welding portion 54 is correspondingly provided with the second electrical connection terminal 711 and the second electrical connection hole 53 to weld and fix the second electrical connection terminal 711 and the second electrical connection hole 53.

[0095] It is understood that the second welding part 54 is disposed on the second electrical connection terminal 711 and the second electrical connection hole 53 to weld and fix the second electrical connection terminal 711 and the second electrical connection hole 53, thereby realizing the fixed connection between the electrical connector 43 and the first support member 71. The second welding part 54 is a second soldering part. Each second electrical connection terminal 711 and each second electrical connection hole 53 is provided with a corresponding second welding part 54.

[0096] The second welding part 54 is located on the side of the circuit board 5 away from the first support member 71. After the cover 2 is closed onto the housing 1, the circuit board 5 can be assembled into the storage cavity 11 through the opening 21 of the cover 2. After the circuit board 5 is positioned and pre-fixed using multiple second electrical connection terminals 711, welding is performed on the side of the circuit board 5 away from the first support member 71 to form the second welding part 54. The second electrical connection terminals 711 are welded and fixed to the second electrical connection holes 53 through the second welding part 54, thereby realizing the welding and electrical connection between the first support member 71 and the circuit board 5.

[0097] like Figure 6 and Figure 7As shown, in some embodiments, the plurality of supports 7 includes a second support 72; the second support 72 is made of an electrically conductive material, the second support 72 includes a third end and a fourth end, the third end is electrically connected with the circuit board 5, and the fourth end is electrically connected with one single cell 31 in the battery module 3; the plurality of tabs 41 includes a first tab 411 and a second tab 412, the first tab 411 is used for connecting between two single cells 31, and the second tab 412 is used for connecting the single cell 31 and the circuit board 5; the second support 72 is multiplexed as the second tab 412.

[0098] It can be understood that the second support 72 is made of an electrically conductive material so as to be capable of conducting electricity and having an electrical connection function. The third end of the second support 72 is electrically connected with the circuit board 5, and the fourth end of the second support 72 is electrically connected with one single cell 31 in the battery module 3, so as to realize the electrical connection between the single cell 31 and the circuit board 5 by using the second support 72. The first tab 411 is used for connecting between two single cells 31, so as to realize the series connection or parallel connection between the two adjacent single cells 31. The second tab 412 is used for connecting the single cell 31 and the circuit board 5, so as to realize the electrical connection between the single cell 31 and the circuit board 5. The second support 72 is multiplexed as the second tab 412, so as to enable the second support 72 to simultaneously play the roles of supporting and connecting the cell and the circuit board 5, which is conducive to simplifying the internal structure of the box body 1 and can reduce the cost.

[0099] In some embodiments, the single cells 31 are provided as four, which are a first single cell, a second single cell, a third single cell and a fourth single cell arranged in sequence. A first tab 411 is connected between the first pole of the first single cell and the second pole of the second single cell, a first tab 411 is connected between the first pole of the second single cell and the second pole of the third single cell, and a first tab 411 is connected between the first pole of the third single cell and the second pole of the fourth single cell, so as to realize the series connection of the four single cells 31. The second support 72 is provided as two. The third end of each of the two second supports 72 is electrically connected with the circuit board 5. The fourth end of one of the second supports 72 is electrically connected with the second pole of the first single cell, and the fourth end of the other second support 72 is electrically connected with the first pole of the fourth single cell.

[0100] Among them, one of the first pole and the second pole is a positive pole, and the other is a negative pole.

[0101] Among them, the electrical connection line 42 is electrically connected with the first tab 411.

[0102] As Figure 6As shown, in some embodiments, the third end comprises a plurality of third electrical connection terminals 721, the circuit board 5 is provided with a plurality of third electrical connection holes 55 corresponding to the plurality of third electrical connection terminals 721, and the third electrical connection terminals 721 are inserted into the corresponding third electrical connection holes 55 to electrically connect the circuit board 5 and the second support 72.

[0103] It can be understood that by inserting the plurality of third electrical connection terminals 721 into the plurality of third electrical connection holes 55 of the circuit board 5, on the one hand, the position of the circuit board 5 can be positioned, and on the other hand, the electrical connection between the two can be achieved. At the same time, this connection method has smaller connection stress, which is beneficial to the stability of the connection between the two.

[0104] For example, the third end of the second support 72 is provided with six third electrical connection terminals 721 at intervals on the side facing the circuit board 5. The circuit board 5 is provided with six third electrical connection holes 55 arranged at intervals in correspondence. Each third electrical connection terminal 721 is correspondingly inserted into a third electrical connection hole 55, thereby achieving electrical connection between the circuit board 5 and the second support 72.

[0105] In some embodiments, a third welding portion 56 is further included; the third welding portion 56 is located on the side of the circuit board 5 away from the second support 72, and the third welding portion 56 is provided in correspondence with the third electrical connection terminals 721 and the third electrical connection holes 55 to weld and fix the third electrical connection terminals 721 and the third electrical connection holes 55.

[0106] It can be understood that the third welding portion 56 is arranged on the third electrical connection terminals 721 and the third electrical connection holes 55 to weld and fix the third electrical connection terminals 721 and the third electrical connection holes 55, thereby achieving fixed connection between the electrical connector 43 and the second support 72. The third welding portion 56 is a third soldering portion. Each third electrical connection terminal 721 and each third electrical connection hole 55 is correspondingly provided with a third welding portion 56.

[0107] The third welding portion 56 is located on the side of the circuit board 5 away from the second support 72, and the circuit board 5 can be assembled into the receiving cavity 11 from the opening 21 of the cover 2 after the cover 2 is covered on the cabinet 1. After the plurality of third electrical connection terminals 721 are used to position and pre-fix the circuit board 5, welding is performed on the side of the circuit board 5 away from the second support 72, and the third welding portion 56 is formed. The third electrical connection terminals 721 and the third electrical connection holes 55 are welded and fixed by the third welding portion 56, so as to achieve welding and electrical connection between the second support 72 and the circuit board 5.

[0108] As Figure 2 and Figure 5As shown, in some embodiments, the cover 2 is provided with an opening 21, and the cover 2 comprises a sealing cover plate 22 covering the opening 21. The opening 21 is arranged above the circuit board 5, and the circuit board 5 falls into the orthographic projection of the opening 21 on the plane where the circuit board 5 is located.

[0109] In the embodiments of the present application, by arranging the opening 21 on the cover 2, when the cover 2 covers the box 1 and seals the receiving cavity 11, the circuit board 5 inside the box 1 can be welded through the opening 21 on the cover 2, which facilitates the assembly and formation of components on the circuit board 5.

[0110] In some embodiments, the box 1, the cover 2 and the sealing cover plate 22 are all made of PA6+30% GF (glass fiber reinforced nylon 6) material.

[0111] In some embodiments, the sealing cover plate 22 and the cover 2 are connected through a first welding layer or a first adhesive layer.

[0112] It can be understood that the sealing connection between the sealing cover plate 22 and the cover 2 is realized through the first welding layer or the first adhesive layer, so as to reliably seal the opening 21 and ensure the sealing property of the battery box.

[0113] In some embodiments, the sealing cover plate 22 and the cover 2 are connected through laser penetration welding, so as to form the first welding layer therebetween.

[0114] In some embodiments, the sealing cover plate 22 and the cover 2 are connected through sealing adhesive, and after the sealing adhesive is solidified, the first adhesive layer is formed therebetween.

[0115] In some embodiments, the first welding layer or the first adhesive layer is annularly arranged at the periphery of the sealing cover plate 22.

[0116] In some embodiments, the inner periphery of the cover 2 is formed with a first connecting groove in a stepped shape, and the first connecting groove is an annular groove. The sealing cover plate 22 is clamped in the first connecting groove, and the sealing cover plate 22 and the groove bottom surface of the first connecting groove are connected through the first adhesive layer or the first welding layer. For example, the groove bottom surface of the first connecting groove is formed with a first adhesive groove recessed downward, the first adhesive groove is used to fill adhesive, the adhesive is used to bond the cover 2 and the sealing cover plate 22, and the first adhesive layer is formed after solidification.

[0117] In some embodiments, the cover 2 and the box 1 are connected through a second welding layer or a second adhesive layer.

[0118] It can be understood that the sealing connection between the box 1 and the cover 2 is realized through the second welding layer or the second adhesive layer, so as to reliably seal the box 1 and ensure the sealing property of the battery box.

[0119] In some embodiments, the box 1 and the cover 2 are connected by laser penetration welding, so as to form a second welding layer between the two.

[0120] In some embodiments, the box 1 and the cover 2 are connected by sealing glue, and after the sealing glue is cured, a second glue layer is formed between the two.

[0121] In some embodiments, the second welding layer or the second glue layer is annularly arranged on the periphery of the cover 2.

[0122] In some embodiments, the inner periphery of the box 1 is formed with a second connecting groove in a stepped shape, and the second connecting groove is an annular groove. The cover 2 has a clamping portion clamped in the second connecting groove, and the clamping portion and the groove bottom surface of the second connecting groove are connected by the second glue layer or the second welding layer. For example, the groove bottom surface of the second connecting groove is formed with a second bonding groove recessed downward, and the second bonding groove is used to fill the adhesive for bonding the box 1 and the cover 2, and forms the second glue layer after solidification.

[0123] As shown in Figure 6 In some embodiments, the distance between the edge of the circuit board 5 and the wall surface of the opening 21 is D, which satisfies: 5mm≤D≤10mm.

[0124] It can be understood that the distance between the edge of the circuit board 5 and the wall surface of the opening 21 is set in the range of 5mm to 10mm, so as to ensure that the circuit board 5 can be installed in the receiving cavity 11 from the opening 21, and ensure that the circuit board 5 has a large enough area.

[0125] In some embodiments, the distance between the edge of the circuit board 5 and the wall surface of the opening 21 is set to 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, or any value between any two of them.

[0126] The assembly method of the battery pack in the embodiments of the present application is as follows: A plurality of single cells 31 are assembled into a battery module 3 by using a tool 6.

[0127] The gasket 41 is welded to the battery module 3 by using the tool 6.

[0128] The structural glue is coated in the box 1 of the battery box, and the battery module 3 with the welded gasket 41 is placed in the box 1, so that the battery module 3 is bonded to the box 1 by the structural glue.

[0129] The cover 2 is welded or bonded to the box 1.

[0130] The electrical connection 43 is fixed to the support 23 of the cover 2, and the gasket 41 is electrically connected to the electrical connection 43 by the electrical connection 43.

[0131] The circuit board 5 is placed in the receiving cavity 11 through the opening 21 of the cover 2, and is positioned and connected through the plurality of first electric connection terminals 431 and the plurality of first electric connection holes 51, the plurality of second electric connection terminals 711 and the plurality of second electric connection holes 53, and the plurality of third electric connection terminals 721 and the third electric connection hole 55.

[0132] The first electric connection terminals 431 and the first electric connection holes 51 are welded to form first welding portions 52, the second electric connection terminals 711 and the second electric connection holes 53 are welded to form second welding portions 54, and the third electric connection terminals 721 and the third electric connection hole 55 are welded to form a third welding portion 56, by using a welding device to extend into the receiving cavity 11 from the opening 21, away from the battery module 3, so as to weld the circuit board 5 and the electric connection 43.

[0133] The sealing cover plate 22 is welded to the opening 21 of the cover 2.

[0134] Therefore, the circuit board 5 and the electric connection 43 can be welded through the opening 21, the circuit board 5 does not need to be fixed by a fastener such as a bolt, and stress is not generated on the circuit board 5, so that the risk of functional failure of the circuit board 5 due to connection stress can be reduced. Meanwhile, a CCS support does not need to be arranged in the battery box, and the cost of the battery pack can be reduced.

[0135] The above describes the embodiments of the present application in detail, and the principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the method of the present application and the core idea thereof. Meanwhile, for those skilled in the art, the specific implementation manner and application range can be changed according to the idea of the present application. In summary, the content of the present description should not be understood as a limitation of the present application.

Claims

1. A battery pack, characterized by, The application relates to a battery module. The battery module comprises a box body (1) configured with a cavity, a cover body (2) connected with the box body (1) and sealing the cavity to form a receiving cavity (11) configured to receive a battery module (3), and an inner wall of the cover body (2) being provided with a support part (23). The battery module (3) comprises at least two single battery cells (31) and a CCS assembly (4), the CCS assembly (4) comprising a plurality of pats (41) and an electric connecting piece (43), the pats (41) being electrically connected with the single battery cells (31), and the electric connecting piece (43) being electrically connected with the pats (41). The pats (41) are fixedly connected with the single battery cells (31), and the electric connecting piece (43) is fixedly connected with the support part (23). The CCS assembly (4) is not provided with a support.

2. The battery pack of claim 1, wherein, The CCS assembly (4) further comprises an electric connecting wire (42), and the electric connecting piece (43) is electrically connected with the pats (41) through the electric connecting wire (42).

3. The battery pack of claim 1 or 2, wherein, The electric connecting wire (42) is a flexible wire.

4. The battery pack of claim 3, wherein, The axial direction of the single battery cell (31) is perpendicular to the height direction of the box body (1), the single battery cell (31) comprises two end faces (311) at two axial ends and a side face (312) connected with the two end faces (311), the pats (41) are fixedly welded with the positive or negative electrode of the end face (311), the electric connecting piece (43) is arranged on the side face (312), and the electric connecting piece (43) is arranged in a spaced mode with the side face (312).

5. The battery pack of claim 1, wherein, The support part (23) is connected with the side wall of the cover body (2), and the support part (23) is arranged in a protruding mode relative to the side wall of the cover body (2) between the single battery cell (31) and the electric connecting piece (43), and the electric connecting piece (43) is arranged on the side of the support part (23) away from the single battery cell (31).

6. The battery pack of claim 5, wherein, Further comprising a circuit board (5) arranged on the side of the battery module (3) facing the cover body (2), the electric connecting piece (43) is arranged between the single battery cell (31) and the circuit board (5), the electric connecting piece (43) comprises a plurality of first electric connecting terminals (431) arranged on the side facing the circuit board (5), the circuit board (5) is provided with a plurality of first electric connecting holes (51) corresponding to the plurality of first electric connecting terminals (431), and the first electric connecting terminals (431) are inserted into the corresponding first electric connecting holes (51) to electrically connect the circuit board (5) and the electric connecting piece (43).

7. The battery pack of claim 1, wherein, Further comprising a first welding part (52) arranged on the side of the circuit board (5) away from the electric connecting piece (43), and the first welding part (52) is arranged in a corresponding mode with the first electric connecting terminals (431) and the first electric connecting holes (51) to weld and fix the first electric connecting terminals (431) and the first electric connecting holes (51).

8. The battery pack of claim 7, wherein, ​ 9. The battery pack of claim 7, wherein, Further comprising a plurality of supporting pieces (7); the plurality of supporting pieces (7) are arranged in the receiving cavity (11), and the circuit board (5) is fixedly connected with the supporting pieces (7).

10. The battery pack of claim 9, wherein, The plurality of supporting pieces (7) comprises a first supporting piece (71); the first supporting piece (71) is integrally injection molded with the cover body (2).

11. The battery pack of claim 10, wherein, The first supporting piece (71) is made of conductive material; the first supporting piece (71) has a first end and a second end, and the first end is electrically connected with the circuit board (5); The side of the cover body (2) away from the receiving cavity (11) is further provided with an output pole post (8), the output pole post (8) is electrically connected with the second end, and the output pole post (8) is electrically connected with the circuit board (5) through the first supporting piece (71).

12. The battery pack of claim 11, wherein, The first supporting piece (71) and the output pole post (8) are an integral structure.

13. The battery pack of claim 11, wherein, The first end comprises a plurality of second electric connection terminals (711), the circuit board (5) is provided with a plurality of second electric connection holes (53) corresponding to the plurality of second electric connection terminals (711), and the second electric connection terminals (711) are inserted into the corresponding second electric connection holes (53) to electrically connect the circuit board (5) with the first supporting piece (71).

14. The battery pack of claim 13, wherein, Further comprising a second welding portion (54); the second welding portion (54) is located on the side of the circuit board (5) away from the first supporting piece (71), and the second welding portion (54) is arranged corresponding to the second electric connection terminals (711) and the second electric connection holes (53) to weld and fix the second electric connection terminals (711) and the second electric connection holes (53).

15. The battery pack of claim 9, wherein, The plurality of supporting pieces (7) comprises a second supporting piece (72); the second supporting piece (72) is made of conductive material, and comprises a third end and a fourth end, the third end is electrically connected with the circuit board (5), and the fourth end is electrically connected with one of the single battery cells (31) in the battery module (3); The plurality of bars (41) comprises a first bar (411) and a second bar (412), the first bar (411) is used for connecting between two single battery cells (31), and the second bar (412) is used for connecting the single battery cell (31) and the circuit board (5); the second supporting piece (72) is multiplexed as the second bar (412).

16. The battery pack of claim 15, wherein, The third end comprises a plurality of third electric connection terminals (721), and the circuit board (5) is provided with a plurality of third electric connection holes (55) corresponding to the plurality of third electric connection terminals (721); the third electric connection terminals (721) are inserted into the corresponding third electric connection holes (55) to electrically connect the circuit board (5) with the second supporting piece (72).

17. The battery pack of claim 16, wherein, A third welding portion (56) is further included; the third welding portion (56) is located on a side of the circuit board (5) away from the second support (72), and the third welding portion (56) is arranged in correspondence with the third electric connection terminal (721) and the third electric connection hole (55) to weld and fix the third electric connection terminal (721) and the third electric connection hole (55).

18. The battery pack of claim 7, wherein, The cover (2) is provided with an opening (21), and the cover (2) comprises a sealing cover plate (22) covering the opening (21). The opening (21) is arranged above the circuit board (5), and the circuit board (5) falls within the orthographic projection of the opening (21) on the plane where the circuit board (5) is located.

19. The battery pack of claim 18, wherein, The distance between the edge of the circuit board (5) and the wall surface of the opening (21) is D, and 5mm≤D≤10mm is satisfied.

20. An electrical device, comprising: A battery pack comprising the battery pack of any one of claims 1 to 19.

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