Battery pack and electric equipment

Abstract

The invention provides a battery pack and electric equipment. The battery pack comprises a battery cell module and a busbar assembly, the battery cell module comprises a battery cell, the battery cell comprises a battery cell body, a pole and a pressure release valve, the pole and the pressure release valve are arranged on the battery cell body, and the pressure release valve is located on one side of the pole. The busbar assembly comprises a support and a connecting busbar integrated on the support, and the connecting busbar is used for connecting the battery cells in series or in parallel. The support comprises a first flow guide hole, and the first flow guide hole is located in one side of the connecting busbar and communicates with the pressure release valve. According to the battery pack and the electric equipment provided by the invention, the risk of short circuit between the battery cells and the busbar can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery cell technology, and specifically to battery packs and electrical equipment. Background Art

[0002] The single-cover design used in current cylindrical power battery systems presents significant technical flaws. This single-cover design integrates the positive and negative electrodes, the pressure relief valve, and the injection port on a single cover. With the pressure relief valve located at the top of the cell, thermal runaway can occur. This can cause material to fall onto the busbar (CCS) assembly during a cell thermal runaway, potentially shorting the cell and busbar, leading to a continuous short circuit and thermal runaway.

[0003] In view of the above problems, the existing technology is in urgent need of improvement. Summary of the Invention

[0004] The embodiments of the present application provide a battery pack and electrical equipment that can not only effectively prevent the accumulation of thermal runaway substances in the electrical connection area and block the short-circuit loop caused by metal foreign matter, but also avoid local pressure accumulation causing secondary thermal runaway.

[0005] In a first aspect, an embodiment of the present application provides a battery pack, comprising: A battery module, comprising a battery cell, wherein the battery cell comprises a battery cell body, a pole and a pressure relief valve, wherein the pole and the pressure relief valve are arranged on the battery cell body, and the pressure relief valve is located on one side of the pole; and A busbar assembly, comprising a bracket and a connecting busbar integrated on the bracket, wherein the connecting busbar is used for connecting cells in series or in parallel; The bracket includes a first flow guide hole, which is located on one side of the connecting bus and is connected to the pressure relief valve.

[0006] In some embodiments of the present application, the battery cell body has a polarity connection area, the pole is the positive pole or negative pole of the battery cell, the polarity connection area is the negative pole or positive pole of the battery cell, and the connecting bus includes a first end connected to the pole and a second end connected to the polarity connection area; wherein, the first guide hole is arranged adjacent to the first end, and the orthographic projection of the first guide hole on the bracket does not overlap with the orthographic projection of the first end on the bracket.

[0007] In some embodiments of the present application, the battery pack further includes a collection component, which is used to collect the voltage and temperature of the battery cell and is integrated into the bracket.

[0008] In some embodiments of the present application, the collection component includes a flexible circuit board, which is integrated into the bracket and connected to the connecting bus; wherein the orthographic projection of the first guide hole on the bracket falls between the orthographic projection of the flexible circuit board and the connecting bus on the bracket.

[0009] In some embodiments of the present application, the flexible circuit board includes an avoidance groove, and the orthographic projection of the avoidance groove on the bracket covers the first guide hole.

[0010] In some embodiments of the present application, the avoidance groove is a contoured groove.

[0011] In some embodiments of the present application, the flexible circuit board has a first positioning hole, and the bracket has a first positioning column, which is passed through the first positioning hole to connect the flexible circuit board to the bracket.

[0012] In some embodiments of the present application, the bus assembly also includes a first output bus and a second output bus, which are located at both ends of the connecting bus and integrated into the bracket, and the first output bus and the second output bus are respectively electrically connected to the flexible circuit board.

[0013] In some embodiments of the present application, the connecting bus, the first output bus and the second output bus have second positioning holes, and the bracket has second positioning columns, which are passed through the second positioning holes to connect the connecting bus, the first output bus and the second output bus to the bracket respectively.

[0014] In some embodiments of the present application, the connecting bus, the first output bus and the second output bus have a second positioning hole, and the bracket has a second positioning column; the insulating sheet has a third positioning hole, and the second positioning column is sequentially passed through the second positioning hole and the third positioning hole to connect the insulating sheet, the connecting bus, the first output bus and the second output bus to the bracket respectively.

[0015] In some embodiments of the present application, the battery pack further includes an insulating sheet, which covers the bus assembly; wherein the insulating sheet includes a second guide hole, which is connected to the first guide hole; or the insulating sheet includes a pressure relief area and a non-pressure relief area, the thickness of the pressure relief area is less than the thickness of the non-pressure relief area, and the orthographic projection of the pressure relief area on the bus assembly covers the first guide hole, and the thermal runaway material rushing out from the first guide hole can break through the pressure relief area.

[0016] In some embodiments of the present application, the battery pack also includes a box body, the battery cell module is arranged in the box body, and the box body has a snap hole; the collection component also includes a connector, the bracket includes a first bracket part and a second bracket part that are bent and connected, the connecting bus and the first guide hole are arranged in the first bracket part, and the connector is arranged in the second bracket part and is electrically connected to the flexible circuit board; wherein, the second bracket part is located on the outside of the box body and has a snap part, and the snap part is snap-connected to the snap hole.

[0017] In some embodiments of the present application, the buckle portion and the connector are located on opposite sides of the bracket.

[0018] In some embodiments of the present application, the plurality of first guide holes include a plurality of guide hole rows extending along the first direction and spaced apart along the second direction, the guide hole rows include a plurality of first guide holes spaced apart along the first direction, and the first direction intersects the second direction.

[0019] In some embodiments of the present application, in adjacent rows of guide holes, the first guide holes in one row of guide holes are arranged alternately with the first guide holes in another row of guide holes.

[0020] In a second aspect, the present application also provides an electrical device, which includes: a battery pack as described above.

[0021] The battery pack and electrical equipment provided by the present application, the battery pack includes a cell module and a bus assembly. The cell module includes a cell, and the cell includes a cell body, a pole and a pressure relief valve. The pole and the pressure relief valve are arranged on the cell body, and the pressure relief valve is located on one side of the pole. The bus assembly includes a bracket and a connecting bus integrated on the bracket, and the connecting bus is used to connect the cells in series or in parallel. The bracket includes a first guide hole, and the first guide hole is located on one side of the connecting bus and is connected to the pressure relief valve. The present application guides the high-temperature ejected thermal runaway substances to be discharged in a directional manner during thermal runaway by providing a first guide hole connected to the pressure relief valve on the bracket of the bus assembly. Thermal runaway substances such as metal objects, electrolytes, high-temperature and high-pressure gases ejected during thermal runaway of the cell are discharged smoothly, and the risk of short circuit between the cell and the bus is reduced, thereby reducing the risk of continuous short circuit and thermal runaway caused by thermal runaway substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a three-dimensional diagram of a battery pack provided in some embodiments of the present application.

[0024] Figure 2 for Figure 1 A three-dimensional schematic diagram of the battery pack shown (excluding the shell and cover).

[0025] Figure 3 for Figure 2 A three-dimensional schematic diagram of the battery pack shown (excluding the insulating sheet).

[0026] Figure 4 for Figure 3 An enlarged view of point A is shown.

[0027] Figure 5for Figure 3 An enlarged view of point B is shown.

[0028] Figure 6 for Figure 3 A top view of the assembly is shown.

[0029] Figure 7 for Figure 6 A partially exploded view of the component shown.

[0030] Figure 8 for Figure 7 An enlarged view of point C is shown.

[0031] Figure 9 for Figure 7 A partial enlarged view of the bracket is shown.

[0032] Figure 10 Schematic diagram of the modules of the electrical equipment provided for this application.

[0033] Description of reference numerals: 1000, electrical equipment; 100, battery pack; 10, battery cell module; 20, busbar assembly; 30, collection assembly; 40, insulation sheet; 50, box; 60, cover; 11. Battery cell; 111. Battery cell body; 112. Terminal; 113. Pressure relief valve; 115. Polarity connection area; 21. Bracket; 22. Connecting busbar; 210. Orifice row; 211. First orifice; 221. First end; 222. Second end; 23. First output busbar; 24. Second output busbar; 25. First positioning post; 26. Second positioning post; 27. Second positioning hole; 214. First bracket portion; 212. Second bracket portion; 213. Snap portion; X, first direction; Y, second direction; 31. Flexible circuit board; 32. Avoidance groove; 33. First positioning hole; 34. Connector; 41. Second guide hole; 42. Pressure relief area; 43. Non-pressure relief area; 44. Third positioning hole. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely 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, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0035] In the related art, the cylindrical cells with a single cover design in current cylindrical power battery systems have significant technical flaws. This single cover design integrates the positive and negative poles, the pressure relief valve, and the injection port on the same cover. The pressure relief valve is located at the top of the cell. When the cell experiences thermal runaway, the thermal runaway material falls onto the busbar (CCS) assembly, potentially causing a short circuit between the cell and the busbar, leading to a continuous short circuit and thermal runaway.

[0036] To improve the above problems, first, please refer to Figures 1 to 9 , an embodiment of the present application provides a battery pack 100, which includes a cell module 10 and a bus assembly 20. The cell module 10 includes a cell 11, and the cell 11 includes a cell body 111, a pole 112 and a pressure relief valve 113. The pole 112 and the pressure relief valve 113 are arranged on the cell body 111, and the pressure relief valve 113 is located on one side of the pole 112. The bus assembly 20 includes a bracket 21 and a connecting bus 22 integrated on the bracket 21, and the connecting bus 22 is used to connect the cells in series or in parallel. The bracket includes a first guide hole 211, and the first guide hole 211 is located on one side of the connecting bus 22 and is connected to the pressure relief valve 113.

[0037] The busbar assembly 20 is an integrated module that realizes the electrical connection of the battery cells. The first guide hole 211 is a through hole that passes through the bracket 21. Its aperture size is determined by the injection flow rate of the pressure relief valve 113. The channel axis of the first guide hole 211 is coaxial with the injection direction of the pressure relief valve 113.

[0038] The battery cell body 111 may be cylindrical or square in structure, and the pressure relief valve 113 may be integrated on the cover (top cover) of the battery cell on one side of the pole 112 by a process such as stamping.

[0039] Among them, the first guide hole 211 is located on the side of the connecting bus 22, that is, the present application adopts a spatial separation design of the connecting bus 22 and the first guide hole 211, which can prevent metal debris from adhering to the welding interface. The bracket 21 has a certain rigidity, and the rigid structure of the bracket 21 can also make the first guide hole 211 have a stable shape to ensure that the pressure relief path is not affected by the expansion and deformation of the battery cell. Integrating the first guide hole 211 on the bracket carrying the electrical connection does not require the installation of an additional pressure relief pipe assembly, which not only achieves structural and functional integration but also simplifies the pressure relief system structure. When the battery cell 11 experiences thermal runaway, the ejected pole piece, graphite, electrolyte, high-temperature and high-pressure gas and other substances will connect the bus and the battery cell 11 together, which will cause the battery cell experiencing thermal runaway and the bus, and the remaining battery cells connected in parallel with the thermal runaway battery cell to form a short circuit with the bus, thereby causing continuous short circuit and thermal runaway phenomena. The present application provides a first guide hole 211 connected to the pressure relief valve 113 on the bracket of the busbar assembly 20, and forms a directional guide structure between the first guide hole 211 and the pressure relief valve 113, so as to quickly guide the high-temperature ejected thermal runaway material to be discharged along the directional guide structure when thermal runaway occurs in the battery cell. This can not only effectively prevent the accumulation of thermal runaway material in the electrical connection area and block the short-circuit loop caused by metal foreign matter, but also avoid local pressure accumulation causing secondary thermal runaway.

[0040] Please refer again Figures 2 to 6 In some embodiments of the present application, the plurality of first guide holes 211 include a plurality of guide hole rows 210 extending along a first direction X and spaced apart along a second direction Y. The guide hole rows 210 include a plurality of first guide holes 211 spaced apart along the first direction X, where the first direction X intersects the second direction Y. Within adjacent guide hole rows 210, the first guide holes 211 in one guide hole row 210 are staggered with the first guide holes 211 in another guide hole row 210. By staggering the first guide holes 211 in adjacent guide hole rows 210, the staggered first guide holes 211 ensure that no matter which area's pressure relief valve 113 is open or which battery cell experiences thermal runaway, the thermal runaway material can find the nearest outlet, thereby reducing flow resistance. The thermal runaway material ejected from the pressure relief valve 113 is evenly dispersed through the staggered guide holes, avoiding local overheating or secondary damage.

[0041] Please refer again Figures 2 to 8In some embodiments of the present application, the battery cell body 111 has a polarity connection area 115, the pole 112 is the positive pole or negative pole of the battery cell 11, the polarity connection area 115 is the negative pole or positive pole of the battery cell 11, and the connecting bus 22 includes a first end 221 connected to the pole 112 and a second end 222 connected to the polarity connection area 115; wherein, the first guide hole 211 is adjacent to the first end 221 and has a certain gap between it and the first end 221, and the orthographic projection of the first guide hole 211 on the bracket 21 does not overlap with the orthographic projection of the first end 221 on the bracket 21.

[0042] The cell body 111 having a polarity connection region 115 means that the polarity connection region 115 of the cell is disposed on the surface of the cell body 111. Specifically, this can be achieved by nickel plating the surface of the aluminum shell. This design enables the polarity connection region 115 to form an integrated conductive structure with the cell body 111. The first end 221 of the connecting busbar 22 refers to the copper-aluminum composite sheet region welded to the pole 112, and the second end 222 refers to the nickel sheet region welded to the polarity connection region 115 of the cell body 111. Specifically, this can be achieved by laser welding. The split welding region achieves physical isolation of the current transmission path from the pressure relief area.

[0043] Because the first end 221 of the busbar connected to the terminal 112 is often smaller than the second end 222 connected to the polarity connection region 115, placing the first guide hole 211 on the side of the first end 221 of the busbar 22 not only effectively utilizes the internal space of the battery pack 100 without affecting the layout of other components, but also spatially isolates the ejection path of the thermal runaway material from the polarity connection region 115 when the battery cell experiences thermal runaway. This effectively blocks the possibility of high-temperature ejected thermal runaway material forming a conductive loop between the busbar 22 and the polarity connection region 115, avoiding the risk of short circuits caused by accumulation of thermal runaway material. This also maintains a stable electrical connection between the busbar, the terminal 112, and the polarity connection region 115, ensuring the reliability of the internal electrical insulation performance of the battery pack 100 under thermal runaway conditions. A certain gap is maintained between the edge of the first guide hole 211 and the weld area of ​​the busbar 22 to prevent high-temperature gas from directly impacting the weld interface. The size of the gap between the edge of the first guide hole 211 and the welding area connecting the busbar 22 can be determined according to actual conditions.

[0044] Please refer again Figures 2 to 5 In some embodiments of the present application, the battery pack 100 further includes a collection component 30 , which is integrated into the bracket and is used to electrically collect voltage and temperature.

[0045] The acquisition component 30 refers to a modular unit for acquiring the operating status signal of the battery cell. Specifically, it can be implemented by combining a flexible circuit board 31 with a sensor, and electrically connected to the battery cell's pole 112 and bracket by welding or plugging. The acquisition component 30 is integrated into the bracket 21, which means that the acquisition component 30 is fixed to the surface of the bracket or embedded in its internal structure. Specifically, it can be mechanically fixed by cooperating with positioning holes and positioning columns, or integrated packaging can be achieved through injection molding. Voltage acquisition is achieved by connecting the bus 22 to the conductive path of the battery cell pole 112. Temperature acquisition is achieved by attaching a thermistor to the battery cell body 111 or the bus. The signal is transmitted to the external monitoring system via the flexible circuit board 31.

[0046] Specifically, after the acquisition component 30 is integrated on the bracket, its signal transmission line forms a spatial complementary relationship with the supporting structure of the bracket.

[0047] By integrating the collection component 30 into the bracket 21, the present application enables the busbar component 20 and the collection component 30 to be processed as a whole, reducing the types of materials, facilitating rapid assembly with the battery module 10, reducing the installation of parts during the assembly of the battery module 10, and better managing materials.

[0048] Compared to existing solutions, the collection assembly 30 is independently mounted on top of the battery cell, directly exposed to the spray range of the pressure relief valve 113. This makes it susceptible to breakdown by metal debris or ablation by high-temperature gases during thermal runaway. This solution integrates the collection assembly 30 into the bracket, utilizing the bracket's physical barrier to block the impact of the sprayed thermal runaway material, ensuring continuous transmission of voltage and temperature signals under extreme operating conditions and avoiding the structural fragility associated with independent installation. The first guide hole 211 allows the sprayed thermal runaway material to be discharged in a targeted manner, preventing contact between the sprayed thermal runaway material and the collection assembly 30, thereby preventing the accumulation of high-temperature material on the wiring surface of the collection assembly 30 and causing secondary failures.

[0049] Please refer again Figures 2 to 6 In some embodiments of the present application, the collection component 30 includes a flexible circuit board 31, which is integrated into the bracket 21 and connected to the connecting bus 22; wherein the orthographic projection of the first guide hole 211 on the bracket falls between the orthographic projection of the flexible circuit board 31 and the orthographic projection of the connecting bus 22 on the bracket 21.

[0050] Among them, the flexible circuit board 31 refers to a circuit substrate with bendable characteristics, which can be made of polyimide material. It is electrically connected to the connecting bus 22 through welding or conductive glue to realize the collection and transmission of battery cell voltage and temperature signals.

[0051] Among them, the positive projection position of the first guide hole 211 refers to the vertical projection area of ​​the first guide hole 211 on the plane of the bracket 21. Specifically, a through-hole structure can be formed on the bracket by mold injection molding. The projection position is limited between the projection area of ​​the flexible circuit board 31 and the connecting bus 22, forming a physical isolation zone (isolation buffer zone) to block the impact of the ejected thermal runaway material.

[0052] Specifically, the flexible printed circuit board 31 is integrated into the bracket surface, with its signal transmission area and the electrical connection points to the busbar 22 forming a fixed layout. The first guide hole 211 is positioned between the two through a projected relationship. This prevents the sprayed high-temperature material from spreading laterally into the signal routing area of ​​the flexible printed circuit board 31 as it is discharged perpendicularly to the first guide hole 211. This also prevents contact failure at the solder joints to the busbar 22 due to accumulation of high-temperature material.

[0053] See also Figure 5 In some embodiments of the present application, the flexible circuit board 31 includes an avoidance groove 32 , and the orthographic projection of the avoidance groove 32 on the bracket 21 covers the first guide hole 211 .

[0054] Among them, the avoidance groove 32 refers to a recessed area formed on the surface of the flexible circuit board 31, which can be formed by mechanical cutting or laser etching. Its shape matches the spatial layout of the first guide hole 211 and is used to accommodate part of the structure of the guide hole, thereby avoiding physical interference between the flexible circuit board 31 and the guide hole.

[0055] Specifically, the flexible circuit board 31 forms a spatial nesting relationship with the first guide hole 211 of the bracket 21 through the avoidance groove 32, so that part of the first guide hole 211 is embedded in the avoidance groove 32. The avoidance groove 32 provides a storage space for the first guide hole 211, and prevents the flexible circuit board 31 from being directly exposed to the pressure relief path when the battery cell has thermal runaway. The area of ​​the flexible circuit board 31 other than the avoidance groove 32 still maintains a complete circuit structure to ensure that the voltage and temperature signal collection function is not affected. The matching relationship between the first guide hole 211 and the avoidance groove 32 physically isolates the contact area between the high-temperature material and the flexible circuit board 31, thereby preventing the circuit from being interrupted due to high-temperature shock or ablation.

[0056] Compared to existing solutions, where the flexible circuit board 31 directly covers the pressure relief valve 113, high-temperature materials can directly impact the surface of the flexible circuit board 31 during thermal runaway, causing circuit fusing or signal acquisition failure. This design, by nesting the avoidance groove 32 and the first guide hole 211, separates the pressure relief path from the critical area of ​​the flexible circuit board 31, maintaining circuit integrity and ensuring unobstructed pressure relief.

[0057] The present application achieves physical isolation of the pressure relief path from the key area of ​​the circuit board through the cooperation between the avoidance groove 32 and the first guide hole 211, solves the problem of signal acquisition failure caused by the impact of high-temperature materials during thermal runaway of the flexible circuit board 31, ensures the continuous and stable transmission of voltage and temperature signals under extreme working conditions, and avoids the risk of secondary short circuit caused by circuit damage.

[0058] In some embodiments of the present application, the avoidance groove 32 is a contoured groove.

[0059] The contoured groove is a groove structure that matches at least part of the outer contour of the first air guide hole 211. This groove structure can be achieved through laser cutting or mold forming, with its edge shape complementing the circumferential edge of the first air guide hole 211. This structure maximizes space around the first air guide hole 211 through shape adaptability, while preserving a continuous routing area for the flexible circuit board 31.

[0060] Specifically, the escape groove 32 of the flexible circuit board 31 is configured to conform to at least a portion of the outer contour of the first air guide hole 211, creating an annular escape space around the first air guide hole 211. The geometry of the escape groove 32 creates a buffer zone between the escape area and the circuit board traces, maintaining the structural integrity of the circuit board while preventing fracture or ablation caused by the impact of ejected material.

[0061] By setting the avoidance groove 32 as a contoured groove, the present application can achieve precise contour matching between the flexible circuit board 31 and the first guide hole 211, realize effective avoidance while minimizing material removal, and maintain the continuity and mechanical stability of the circuit board routing.

[0062] Please refer again Figure 5 In some embodiments of the present application, the flexible circuit board 31 has a first positioning hole 33, and the bracket has a first positioning column 25. The first positioning column 25 is passed through the first positioning hole 33 to connect the flexible circuit board 31 to the bracket.

[0063] The first positioning hole 33 is a hole-like structure formed on the flexible circuit board 31 and designed to mate with the positioning structure of the bracket 21. Specifically, it can be a circular, square, or polygonal hole. Its size creates a clearance or interference fit with the first positioning post 25, ensuring that the flexible circuit board 31 can move in the predetermined direction during installation. The first positioning post 25 is a raised structure provided on the bracket. Specifically, it can be a cylindrical, prism, or conical column. Its height is adapted to the thickness of the flexible circuit board 31 and is used to limit the horizontal displacement of the flexible circuit board 31.

[0064] Specifically, the flexible circuit board 31 engages with the first positioning post 25 on the bracket through the first positioning hole 33. During installation, the flexible circuit board 31 moves axially along the first positioning post 25 until it is fully in contact with the surface of the bracket 21. At this point, the relative position of the avoidance groove 32 of the flexible circuit board 31 and the first guide hole 211 is strictly defined, ensuring that the flexible circuit board 31 avoids the area where the first guide hole 211 is located. When the battery cell experiences thermal runaway, high-temperature ejecta are discharged through the first guide hole 211. Due to its precise positioning, the flexible circuit board 31 is not impacted or covered by the ejecta. It maintains stable contact with the electrical connection area of ​​the busbar 22, maintaining normal voltage and temperature signal acquisition functions.

[0065] Compared to existing technologies, traditional flexible circuit board 31 installation relies on manual alignment or simple snap-on fastening, making it difficult to precisely control the relative position of the avoidance groove 32 and the pressure relief valve 113 (first guide hole 211). This can easily cause the avoidance groove 32 to shift due to assembly errors. This solution eliminates human error through the mechanical positioning structure of positioning holes and positioning posts, ensuring consistent positioning accuracy of the flexible circuit board 31 during batch assembly.

[0066] Through the above technical solution, the present application solves the problem of the avoidance groove 32 being offset due to the installation misalignment of the flexible circuit board 31, thereby avoiding the interruption of signal transmission caused by the impact of high-temperature ejecta on the flexible circuit board 31 during thermal runaway, and ensuring the long-term reliability of the voltage and temperature acquisition functions.

[0067] Please refer again Figures 2 to 8 In some embodiments of the present application, the bus assembly 20 also includes a first output bus 23 and a second output bus 24. The first output bus 23 and the second output bus 24 are located at both ends of the connecting bus 22 and are integrated into the bracket. The first output bus 23 and the second output bus 24 are respectively electrically connected to the flexible circuit board 31.

[0068] Please refer again Figure 4 In some embodiments of the present application, the connecting bus 22, the first output bus 23, and the second output bus 24 have a second positioning hole 27, and the bracket has a second positioning column 26. The second positioning column 26 is passed through the second positioning hole 27 to connect the connecting bus 22, the first output bus 23, and the second output bus 24 to the bracket respectively.

[0069] Among them, the first output busbar 23 refers to a conductive component for outputting current. Specifically, it can be stamped and formed from aluminum or copper materials. Its surface can be plated to prevent oxidation. In the busbar assembly 20, it assumes the function of connecting the battery module 10 to the positive electrode of the external circuit. Among them, the second output busbar 24 refers to a conductive component symmetrically arranged with the first output busbar 23. Its material and processing method are consistent with those of the first output busbar 23. It is used to connect the battery module 10 to the polarity connection area 115 of the external circuit. In this embodiment, the first output busbar 23 is the output busbar of the polarity connection area 115, and the second output busbar 24 is the positive output busbar.

[0070] The second positioning holes 27 are through-holes provided on the busbar. Specifically, a stamping process can be used to form circular holes at both ends of the busbar with diameters matching the positioning posts. These holes are used to cooperate with the positioning posts on the bracket to achieve mechanical positioning. The second positioning posts 26 are raised structures provided on the bracket 21. Specifically, they can be integrally formed with the bracket using an injection molding process. Their height and diameter form an interference fit with the second positioning holes 27, limiting the displacement of the busbar under thermal runaway shock.

[0071] Specifically, the first output bus 23 and the second output bus 24 are symmetrically distributed at both ends of the connecting bus 22 to form a three-point positioning structure, and rigid fixation is achieved through the interference fit between the second positioning column 26 and the second positioning hole 27. During the welding process, after the second positioning column 26 is inserted into the second positioning hole 27, the horizontal displacement of the bus can be constrained to ensure that the welding trajectory is consistent with the preset path. When thermal runaway occurs in the battery cell, the impact force generated by the high-temperature ejecta acts on the bus assembly 20. At this time, the mating interface between the second positioning column 26 and the second positioning hole 27 offsets the lateral displacement through friction, preventing the bus from leaving the preset position and causing a short circuit in adjacent battery cells. The design of the three buses sharing the same set of positioning columns ensures that the electrical connection contacts of the flexible circuit board 31 and the bus are always in the same plane, eliminating abnormal contact resistance caused by assembly deviation.

[0072] Compared to existing technologies, traditional busbar assemblies are often fixed to the bracket using screws or adhesives, which can easily loosen or fall off under thermal runaway shock. However, this application uses an interference fit between the positioning posts and the positioning holes to form a mechanical interlocking structure that requires no additional fasteners. This structure can withstand both the mechanical stress of the welding process and the transient impact of high-temperature ejecta. In existing technologies, the connection between the busbar and the flexible circuit board 31 is prone to misalignment due to assembly errors. However, this solution uses a three-point positioning structure to control the assembly tolerance within the clearance between the second positioning post 26 and the hole, ensuring the reliability of the electrical connection.

[0073] Through this technical solution, the present application solves the problems of welding offset and electrical connection failure caused by unreliable positioning of the busbar and bracket 21. Furthermore, the rigid fixing structure prevents busbar displacement caused by the impact of high-temperature ejecta during thermal runaway, thus preventing the formation of short circuits between adjacent battery cells. The three-point positioning design ensures stable contact between the flexible circuit board 31 and the electrical connection points of the busbar, ensuring the continuity of voltage and temperature signal acquisition.

[0074] In some embodiments of the present application, the insulating sheet 40 has a third positioning hole 44, and the second positioning column 26 is sequentially passed through the second positioning hole 27 and the third positioning hole 44 to connect the insulating sheet 40, the connecting bus 22, the first output bus 23 and the second output bus 24 to the bracket respectively.

[0075] The third positioning hole 44 refers to a through hole on the insulating sheet 40 , which can be formed by a die-cutting process and is used to cooperate with the second positioning column 26 to achieve stacking and fixing of the insulating sheet 40 and the busbar.

[0076] Specifically, during assembly, the second positioning post 26 first passes through the second positioning hole 27 connecting the busbar 22, the first output busbar 23, and the second output busbar 24, precisely defining the installation position of each busbar. Subsequently, the third positioning hole 44 of the insulating sheet 40 and the second positioning post 26 are further inserted to form a multi-layer structure. This sequential insertion method ensures that there is no relative displacement between the busbar and the bracket. At the same time, the insulating sheet 40 covers the surface of the busbar, forming a physical isolation layer. When the battery cell experiences thermal runaway, high-temperature ejecta impact the busbar assembly 20. The cooperation between the second positioning post 26 and the positioning hole can resist the misalignment caused by external forces, while the insulating sheet 40 prevents conductive materials from contacting the busbar, preventing a short circuit. The insulating sheet 40, the busbar, and the bracket 21 are doubly fixed by the second positioning post 26 (integrated positioning design), simplifying the assembly process and improving the overall structural strength and reliability of the assembly.

[0077] Through the above technical solution, the present application solves the structural instability problem caused by positioning deviation when the bus assembly 20 is connected to the bracket. At the same time, the isolation effect of the insulating sheet 40 prevents thermal runaway ejecta from causing a short circuit, thereby improving the reliability and safety of the battery pack 100 under extreme working conditions.

[0078] See also Figure 2 In some embodiments of the present application, the insulating sheet 40 includes a second guide hole 41 , and the second guide hole 41 is connected to the first guide hole 211 .

[0079] The second guide holes 41 are through-holes in the insulating sheet 40, specifically formed using a die-cutting process. They cooperate with the first guide holes 211 to further form a pressure relief channel. Forming the second guide holes 41 in the insulating sheet 40 reduces the impact of thermal runaway material from the battery cell's thermal runaway upon exiting the first guide holes 211, thereby smoothly and directional guiding the discharge of the thermal runaway material.

[0080] In some embodiments of the present application, the insulating sheet 40 includes a pressure relief area 42 and a non-pressure relief area 43. The thickness of the pressure relief area 42 is less than the thickness of the non-pressure relief area 43. The positive projection of the pressure relief area 42 on the bus assembly 20 covers the first guide hole 211. The thermal runaway material rushing out of the first guide hole 211 can break through the pressure relief area 42.

[0081] The pressure relief area and the non-pressure relief area 43 can be formed by thinning a local area of ​​the insulating sheet 40. Because the thickness of the pressure relief area 42 is smaller than that of the non-pressure relief area 43, the thermal runaway material rushing out of the first guide hole 211 can easily break through the pressure relief area 42 without affecting the non-pressure relief area 43, thereby maintaining the insulation protection provided by the insulating sheet 40 in the non-pressure relief area 43 to the flexible printed circuit board 31 and the busbar assembly 20.

[0082] In this embodiment, the insulating sheet 40 is an insulating mica sheet.

[0083] See also Figure 1 and Figure 9 In some embodiments of the present application, the battery pack 100 further includes a housing 50 and a cover 60. The cell module 10 is disposed within the housing 50, which has a snap hole (not shown). The collection assembly 30 further includes a connector (not shown). The bracket 21 includes a first bracket portion 214 and a second bracket portion 212 that are bent and connected. The bus bar 22 and the first guide hole 211 are disposed on the first bracket portion 214. The connector is disposed on the second bracket portion 212 and is electrically connected to the flexible circuit board 31. The second bracket portion 212 is located outside the housing 50 and has a snap portion 213 that snaps into the snap hole. The cover 60 is disposed on the housing 50 and covers the insulating sheet 40.

[0084] The snap hole refers to a groove formed on the outer wall of the box body 50 that can form a snap connection with the snap portion 213. The snap portion 213 refers to a protruding structure formed on the second bracket portion 212 that can snap fit with the snap hole. The shapes of the snap portion 213 and the snap hole can be set according to specific circumstances.

[0085] The present application provides a snap hole on the box body 50 and forms a snap portion 213 on the second bracket portion 212 of the bracket, so that the bracket 21 can be snapped onto the predetermined snap hole, reducing the mechanical fixing structure and reducing costs. The design is easy to operate and has high connection reliability.

[0086] In some embodiments of the present application, the locking portion 213 and the connector are located on opposite sides of the bracket 21 .

[0087] Second, see Figure 10 , the present application also provides an electric device 1000, which includes the battery pack 100 as described above.

[0088] Among them, the specific structure of the battery pack 100 refers to the above embodiments. Since the electrical equipment 1000 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0089] It is understood that the electrical device 1000 includes, but is not limited to, electric toys, electric tools, battery-powered vehicles, cars, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft. Cars may include gasoline-powered cars, gas-powered cars, and new energy vehicles.

[0090] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: include: A battery cell module, comprising a battery cell, wherein the battery cell comprises a battery cell body, a pole and a pressure relief valve, wherein the pole and the pressure relief valve are arranged on the battery cell body, and the pressure relief valve is located on one side of the pole; and A busbar assembly, comprising a bracket and a connecting busbar integrated on the bracket, wherein the connecting busbar is used to connect the battery cells in series or in parallel; Wherein, the bracket includes a first guide hole, which is located on one side of the connecting bus and is connected to the pressure relief valve.

2. The battery pack according to claim 1, wherein: The battery cell body has a polarity connection area, the pole is the positive pole or negative pole of the battery cell, the polarity connection area is the negative pole or positive pole of the battery cell, and the connecting busbar includes a first end connected to the pole and a second end connected to the polarity connection area; The first air guide hole is arranged adjacent to the first end, and the orthographic projection of the first air guide hole on the bracket does not overlap with the orthographic projection of the first end on the bracket.

3. The battery pack according to claim 1, wherein: The battery pack further includes a collection component, which is integrated with the bracket and is used for collecting voltage and temperature of the battery cell.

4. The battery pack according to claim 3, wherein: The collecting component includes a flexible circuit board, which is integrated with the bracket and connected to the connecting bus; The orthographic projection of the first guide hole on the bracket falls between the orthographic projections of the flexible circuit board and the connecting busbar on the bracket.

5. The battery pack according to claim 4, wherein: The flexible circuit board includes an avoidance groove, and the orthographic projection of the avoidance groove on the bracket covers the first guide hole.

6. The battery pack according to claim 5, wherein: The avoidance groove is a contoured groove.

7. The battery pack according to claim 4, wherein: The flexible circuit board has a first positioning hole, and the bracket has a first positioning column. The first positioning column is passed through the first positioning hole to connect the flexible circuit board to the bracket.

8. The battery pack according to claim 4, wherein: The busbar assembly also includes a first output busbar and a second output busbar. The first output busbar and the second output busbar are located at both ends of the connecting busbar and integrated into the bracket. The first output busbar and the second output busbar are electrically connected to the flexible circuit board respectively.

9. The battery pack according to claim 8, wherein: The connecting bus, the first output bus and the second output bus have second positioning holes, and the bracket has a second positioning column, which is passed through the second positioning hole to connect the connecting bus, the first output bus and the second output bus to the bracket respectively.

10. The battery pack according to claim 9, wherein: The connecting busbar, the first output busbar and the second output busbar have second positioning holes, and the bracket has a second positioning column; The battery pack also includes an insulating sheet, which covers the busbar assembly. The insulating sheet has a third positioning hole. The second positioning column is sequentially inserted into the second positioning hole and the third positioning hole to connect the insulating sheet, the connecting busbar, the first output busbar and the second output busbar to the bracket respectively.

11. The battery pack according to any one of claims 1 to 10, wherein: The battery pack further includes an insulating sheet, wherein the insulating sheet covers the busbar assembly; Wherein, the insulating sheet includes a second guide hole, and the second guide hole is connected to the first guide hole; or The insulating sheet includes a pressure relief area and a non-pressure relief area. The thickness of the pressure relief area is smaller than that of the non-pressure relief area. The orthographic projection of the pressure relief area on the busbar assembly covers the first guide hole. The thermal runaway material rushing out of the first guide hole can break through the pressure relief area.

12. The battery pack according to any one of claims 3 to 10, wherein: The battery pack further includes a box body, the battery cell module is arranged in the box body, and the box body has a buckle hole; The collection assembly further includes a connector, the bracket includes a first bracket portion and a second bracket portion connected by a bend, the connecting bus and the first guide hole are provided on the first bracket portion, and the connector is provided on the second bracket portion and electrically connected to the flexible circuit board; Wherein, the second bracket portion is located on the outside of the box body and has a buckle portion, and the buckle portion is buckled and connected to the buckle hole.

13. The battery pack according to claim 12, wherein: The buckle portion and the connector are located on opposite sides of the bracket.

14. The battery pack according to any one of claims 1 to 10, wherein: The plurality of first guide holes include a plurality of guide hole rows extending along a first direction and spaced apart along a second direction. The guide hole rows include a plurality of first guide holes spaced apart along the first direction. The first direction intersects the second direction.

15. The battery pack according to claim 14, wherein: In adjacent rows of guide holes, the first guide holes in one row of guide holes are arranged alternately with the first guide holes in another row of guide holes.

16. An electrical device, characterized in that: include: The battery pack according to any one of claims 1 to 15.

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