Battery pack and electric device

Abstract

Disclosed in the present application are a battery pack and an electric device. An end face of a terminal of a battery cell of the battery pack in a preset direction is connected to a bus bar or a connector. In the present application, the position on the end face of the terminal where the bus bar or the connector is connected is spaced apart from an outer edge of the end face, that is, the welding position on the end face of the terminal is spaced apart from the outer edge of the end face. In this way, the welding position on the end face of the terminal is as far away from a seal as possible, so as to reduce the risk of melting of the seal during welding, thereby reducing the risk of sealing failure of the seal.

Description

Battery packs and electrical devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 27, 2023, with application number 202321653972.1 and invention name “Battery Pack and Electrical Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to, but is not limited to, a battery pack and an electrical device. Background Art

[0003] As a core component and power source for new energy vehicles, power batteries are a key research focus. The storage capacity of power batteries determines the range of new energy vehicles. The top cover and the terminal blocks of power batteries are typically sealed with plastic. The terminal blocks are typically connected to external circuit structures through welding. The high temperatures of the welding process can easily cause plastic slurry on the top cover, leading to seal failure and other problems. Technical Solutions

[0004] The present application provides a battery pack. The battery pack includes a single cell, and the single cell includes a shell and a top cover assembly. The shell and the top cover assembly are connected to form a cavity for accommodating the battery cell. The battery pack also includes a busbar, which is electrically connected to the single cell. The top cover assembly has a preset direction, and the top cover assembly includes a top cover member, and the top cover member is provided with an assembly hole, and the assembly hole passes through the top cover member along the preset direction. The top cover assembly also includes a pole, which is passed through the assembly hole, and the end face of the pole in the preset direction is connected to the busbar, wherein the position on the end face where the busbar is connected is spaced from the outer edge of the end face. The top cover assembly also includes a seal, which is arranged between the pole and the top cover member.

[0005] In one embodiment of the present application, the area of ​​the end face of the pole in the preset direction is A mm 2 The area of ​​the end surface of the top cover in the preset direction is M mm 2 ,in

[0006] In one embodiment of the present application, the area of ​​the end face of the pole in the preset direction is A mm 2 , satisfying: A≥150.

[0007] In one embodiment of the present application, the end face of the pole in a preset direction includes a first end face and a second end face, and the first end face and the second end face are spaced apart from each other in the preset direction; wherein, the first end face is connected to the bus, and the position on the first end face where the bus is connected is spaced apart from the outer edge of the first end face; the single battery also includes a connector, the pole is electrically connected to the battery cell through the connector, the second end face is connected to the connector, and the position on the second end face where the connector is connected is spaced apart from the outer edge of the second end face.

[0008] In one embodiment of the present application, the pole includes: a pole body, which is passed through the assembly hole; and a limiting portion, which is connected to one end of the pole body in a preset direction, the end face of the limiting portion facing away from the pole body is a first end face, and the end face of the pole body facing away from the limiting portion is a second end face, and the limiting portion cooperates with the connecting member to clamp the top cover member to fix the pole to the top cover member.

[0009] In an embodiment of the present application, the area of ​​the second end surface is smaller than the area of ​​the end surface of the connecting member facing the pole.

[0010] In one embodiment of the present application, the area of ​​the first end surface is greater than the area of ​​the second end surface.

[0011] In one embodiment of the present application, the seal includes: a first sealing portion, which is arranged around the outer periphery of the pole body and is clamped between the pole body and the wall of the assembly hole; a second sealing portion, which is connected to the first sealing portion and is arranged around the outer periphery of the limiting portion; and a third sealing portion, which is connected to the first sealing portion and is clamped between the top cover and the connecting member; wherein the first sealing portion, the second sealing portion and the third sealing portion are an integral injection molded structure.

[0012] In one embodiment of the present application, the area of ​​the end surface is A mm 2 The area of ​​the end face where the busbar is connected is S mm 2 , satisfying: 0.06≤S / A≤0.6.

[0013] Correspondingly, the present application also provides a battery pack, comprising: a single battery, including a shell, a top cover assembly, a battery cell and a connector, the shell and the top cover assembly are docked to form a cavity for accommodating the battery cell, and the connector is electrically connected to the battery cell; and a busbar, electrically connected to the single battery; wherein the top cover assembly has a preset direction, and the top cover assembly comprises: a top cover member, which is provided with an assembly hole, and the assembly hole passes through the top cover member along the preset direction; a pole, which is passed through the assembly hole, and the end face of the pole in the preset direction is connected to the connector, wherein the position on the end face where the connector is connected is spaced from the outer edge of the end face; and a sealing member, which is arranged between the pole and the top cover member.

[0014] In one embodiment of the present application, the area of ​​the end face of the pole in the preset direction is A mm2 The area of ​​the end surface of the top cover in the preset direction is M mm 2 ,in

[0015] In one embodiment of the present application, the area of ​​the end face of the pole in the preset direction is A mm 2 , satisfying: A≥150.

[0016] In one embodiment of the present application, the area of ​​the end surface is A mm 2 The area of ​​the end face where the connector is connected is S mm 2 , satisfying: 0.06≤S / A≤0.6.

[0017] Accordingly, the present application further provides an electrical device, which includes a battery pack as described in the above embodiment, and the battery pack serves as a power supply for the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] FIG1 is a schematic structural diagram of an embodiment of a top cover assembly of the present application;

[0020] FIG2 is a schematic diagram of the exploded structure of the top cover assembly shown in FIG1 ;

[0021] FIG3 is a schematic cross-sectional view of the top cover assembly taken along the AA direction shown in FIG1 ;

[0022] FIG4 is a schematic structural diagram of the top cover assembly B region shown in FIG3 ;

[0023] FIG5 is a schematic structural diagram of an embodiment of a pole of the present application;

[0024] FIG6 is a schematic diagram of the structure of the pole shown in FIG5 when viewed from above;

[0025] FIG7 is a schematic structural diagram of an embodiment of a connector of the present application. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described 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 efforts are within the scope of protection of this application.

[0027] In one embodiment, the electrical device includes a battery pack. The battery pack includes single cells. Single cells include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and the embodiments of the present disclosure are not limited thereto. The battery pack is the power supply for the electrical device. The electrical device may be a mobile phone, portable device, laptop computer, electric vehicle, electric vehicle, ship, spacecraft, electric toy, and electric tool. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0028] The battery pack also includes a busbar. The battery pack contains multiple individual cells, which are connected in series via the busbar. Alternatively, the individual cells are connected to electrical components in the battery pack, such as the BDU (Battery Energy Distribution Unit), via the busbar.

[0029] The following describes the single cell battery according to the embodiment of the present application.

[0030] Please refer to Figures 1 to 4, Figure 1 is a structural schematic diagram of an embodiment of a top cover assembly of the present application, Figure 2 is an exploded structural schematic diagram of the top cover assembly shown in Figure 1, Figure 3 is a cross-sectional structural schematic diagram of the top cover assembly in the AA direction shown in Figure 1, and Figure 4 is a structural schematic diagram of the top cover assembly B area shown in Figure 3.

[0031] In one embodiment, a single cell includes a housing and a top cover assembly 10, wherein the housing and the top cover assembly 10 are connected to form a cavity for accommodating the battery cell.

[0032] Specifically, the top cover assembly 10 has a preset direction (as shown by arrow X in FIG4 , the same below). The top cover assembly 10 includes a top cover member 11, which is provided with an assembly hole 111, and the assembly hole 111 passes through the top cover member 11 along the preset direction. The top cover assembly 10 also includes a pole 12, which is passed through the assembly hole 111. The top cover assembly 10 also includes a connector 14, and the pole 12 is electrically connected to the battery cell through the connector 14. The top cover assembly 10 also includes a seal 13, which is arranged between the pole 12 and the top cover member 11.

[0033] The end face of the pole 12 in a preset direction is connected to the bus or connector 14, and the position on the end face where the bus or connector 14 is connected is spaced from the outer edge of the end face. In this way, the end face of the pole 12 is usually connected to the bus or connector 14 by welding, and the area defined by the connection position of the end face of the pole 12 and the bus or connector 14 is the welding area. In this embodiment, the position on the end face of the pole 12 where the bus or connector 14 is connected is spaced from the outer edge of the end face, that is, the welding position on the end face of the pole 12 is spaced from the outer edge of the end face, so that the welding position on the end face of the pole 12 can be as far away from the seal 13 as possible, and the end face of the pole 12 can provide sufficient buffer heat dissipation space, so that the temperature of the contact position between the seal 13 and the pole 12 does not reach the melting temperature, that is, the risk of the seal 13 melting during the welding process can be reduced, thereby reducing the risk of the seal 13 failing to seal.

[0034] It should be noted that after the end face of the pole 12 is welded to the busbar or the connector 14 , it can be visually observed whether the sealing member 13 is melted.

[0035] Furthermore, the end surface of the pole 12 in the preset direction includes a first end surface 121 and a second end surface 122, and the first end surface 121 and the second end surface 122 are spaced apart from each other in the preset direction. The first end surface 121 is connected to the busbar, and the location on the first end surface 121 where the busbar is connected is spaced apart from the outer edge of the first end surface 121, wherein the location on the first end surface 121 where the busbar is connected defines a first welding area 123, as shown in FIG5 . The second end surface 122 is connected to the connector 14, and the location on the second end surface 122 where the connector 14 is connected is spaced apart from the outer edge of the second end surface 122, wherein the location on the second end surface 122 where the connector 14 is connected defines a second welding area 124, as shown in FIG6 .

[0036] In one embodiment, the area of ​​the end surface of the pole 12 in the preset direction is A mm 2 The area of ​​the end surface of the top cover 11 in the preset direction is M mm 2 ,in In this way, this embodiment reasonably sets the area of ​​the end face of the pole 12 in the preset direction. On the one hand, it can avoid as much as possible the welding position on the end face being too close to the seal 13 due to the area of ​​the end face being too small, and further reduce the risk of sealing failure of the seal 13. On the other hand, it can avoid as much as possible the connection strength of the welding area failing to meet the requirements due to the area of ​​the end face being too large.

[0037] Specifically, taking the end surface of the top cover 11 facing away from the battery cell (ie, the third end surface 112, as shown in FIG2 ) as an example, the area of ​​the third end surface 112 is M mm 2For the case where the end face of the pole 12 in the preset direction includes the first end face 121 and the second end face 122, the area of ​​the first end face 121 is A1 mm 2 ,in The area of ​​the second end surface 122 is A2 mm 2 ,in

[0038] It should be noted that, with regard to the method for obtaining the area of ​​the first end face 121, the area of ​​the second end face 122, and the area of ​​the end face of the top cover member 11 in a preset direction in the embodiment of the present application, a CCD (charge coupled device) camera can be used to capture images of the first end face 121, the second end face 122, and the end face of the top cover member 11 in a preset direction, and then measurement software can be used to determine the images of the aforementioned end faces in the captured images and calculate the areas of the aforementioned end faces.

[0039] Moreover, after the pole 12 of the embodiment of the present application is welded to the busbar or the connector 14, the connection strength of the welding area should meet certain requirements, specifically requiring the pull-out force of the welding area to be greater than a set value. The pull-out force of the welding area should be understood as the minimum pull-out force required to separate the pole 12 from the busbar or the pole 12 from the connector 14 after welding. Taking the pole 12 and the busbar as an example, the pull-out force of the welding area can be tested by equipment such as a tensile testing mechanism. For example, the pole 12 and the busbar are pulled separately by the tensile testing mechanism, and the pole 12 is separated from the busbar by gradually increasing the pull-out force. The tensile testing mechanism can record the tensile force value when the pole 12 and the busbar are just separated. The tensile force value is the pull-out force of the welding area. For example, the pull-out force of the welding area is generally required to be greater than or equal to 500N.

[0040] In one embodiment, the area of ​​the end surface of the pole 12 in the preset direction is A mm 2 , satisfying: A ≥ 150. Thus, by reasonably setting the area of ​​the end face of the pole 12 in the preset direction, this embodiment can minimize the risk of the welding position on the end face being too close to the seal 13 due to the end face being too small, further reducing the risk of sealing failure of the seal 13.

[0041] Specifically, taking the end surface of the top cover 11 facing away from the battery cell (ie, the third end surface 112) as an example, the area of ​​the third end surface 112 is M mm 2 For the case where the end face of the pole 12 in the preset direction includes the first end face 121 and the second end face 122, the area of ​​the first end face 121 is A1 mm 2 , satisfying: A1 ≥ 150, and the area of ​​the second end surface 122 is A2 mm 2 , satisfying: A2≥150.

[0042] In one embodiment, the area of ​​the end surface of the pole 12 in the preset direction is A mm 2 The area of ​​the end face where the busbar or connector 14 is connected is S mm 2 , satisfying: 0.06≤S / A≤0.6. Thus, by properly setting the area of ​​the end face of the pole 12 in the preset direction and the area of ​​the location on the end face where it connects to the busbar or connector 14, this embodiment can, on the one hand, minimize the risk of the weld on the end face being too close to the seal 13 due to an overly small end face area, further reducing the risk of sealing failure of the seal 13. On the other hand, it can minimize the risk of the weld area failing to meet the connection strength requirements due to an overly large end face area.

[0043] Specifically, taking the end surface of the top cover 11 facing away from the battery cell (ie, the third end surface 112) as an example, the area of ​​the third end surface 112 is M mm 2 For the case where the end face of the pole 12 in the preset direction includes the first end face 121 and the second end face 122, the area of ​​the first end face 121 is A1 mm 2 The area of ​​the location where the busbar is connected on the first end surface 121 is S1 mm 2 , satisfying: 0.06≤S1 / A1≤0.6; and the area of ​​the second end surface 122 is A2 mm 2 The area of ​​the second end surface 122 where it is connected to the connector 14 is S2 mm. 2 , satisfying 0.06≤S2 / A2≤0.6. Figure 5 exemplarily shows that the position on the first end face 121 where the bus is connected is circular, that is, the first welding area 123 is circular, wherein the diameter of the circle is D1 mm, satisfying: 7≤D1≤13, so the area of ​​the position on the first end face 121 where the bus is connected can be calculated by the diameter D1. Figure 6 exemplarily shows that the position on the second end face 122 where the connector 14 is connected is circular, that is, the second welding area 124 is circular, wherein the diameter of the circle is D2 mm, satisfying: 7≤D2≤13, so the area of ​​the position on the second end face 122 where the connector 14 is connected can be calculated by the diameter D2. It can be understood that the position on the first end face 121 where the bus is connected and the position on the second end face 122 where the connector 14 is connected can also be regular shapes such as squares and triangles, or irregular shapes.

[0044] In one embodiment, the terminal 12 includes a terminal body 125 and a retaining portion 126. The terminal body 125 is inserted into the assembly hole 111. The retaining portion 126 is connected to one end of the terminal body 125 in a predetermined direction. The end face of the retaining portion 126 facing away from the terminal body 125 is a first end face 121, and the end face of the terminal body 125 facing away from the retaining portion 126 is a second end face 122. The retaining portion 126 cooperates with the connector 14 to clamp the top cover 11, thereby securing the terminal 12 to the top cover 11.

[0045] Specifically, the area of ​​the first end face 121 is larger than the area of ​​the second end face 122, and the area of ​​the second end face 122 is smaller than the area of ​​the end face of the connector 14 facing the pole 12 (i.e., the fourth end face 141, as shown in FIG7 ). In other words, the limiting portion 126 protrudes outward relative to the pole body 125 in a direction perpendicular to the preset direction, and similarly, the connector 14 protrudes outward relative to the pole body 125 in a direction perpendicular to the preset direction, so that the limiting portion 126 and the connector 14 can cooperate to clamp the top cover 11 to fix the pole 12 to the top cover 11. In addition, the end face area of ​​the connector 14 is relatively large, which can limit the pole 12 from escaping from the inside to the outside, thereby preventing the pole 12 from being separated from the seal 13 due to force, and further reducing the risk of sealing failure of the seal 13.

[0046] In one embodiment, the sealing member 13 includes a first sealing portion 131, a second sealing portion 132, and a third sealing portion 133. The first sealing portion 131 is arranged around the outer periphery of the pole body 125, and the first sealing portion 131 is sandwiched between the pole body 125 and the hole wall of the assembly hole 111, so that the pole body 125 and the hole wall of the assembly hole 111 are sealed and insulated from each other. The second sealing portion 132 is connected to the first sealing portion 131, and the second sealing portion 132 is arranged around the outer periphery of the limiting portion 126, so that the limiting portion 126 and the top cover sheet are sealed and insulated from each other. The third sealing portion 133 is connected to the first sealing portion 131, and the third sealing portion 133 is sandwiched between the top cover 11 and the connector 14, so that the top cover 11 and the connector 14 are sealed and insulated from each other.

[0047] The first sealing portion 131, the second sealing portion 132 and the third sealing portion 133 are an integral injection-molded structure. In other words, the seal 13 of this embodiment is integrally injection-molded. Specifically, the pole 12 and the top cover sheet are usually made of metal; the pole 12 and the top cover sheet are subjected to surface nano-processing, so that a large number of nano-pores with a diameter of 20nm to 200nm are corroded on the surface of the pole 12 and the top cover sheet; then the pole 12 and the top cover sheet are placed in a mold, and the seal 13 is integrally injection-molded. Through the full combination of plastic particles with the nano-pores on the surface of the pole 12 and the top cover sheet, an effective sealing surface is formed to ensure airtightness requirements.

[0048] In the prior art, the battery's terminal post 12 is typically sealed to the top cover via a sealing ring at its base. This approach involves complex structures and processes. This embodiment utilizes an integral injection-molded seal 13, eliminating the conventional sealing ring. Instead, the seal 13 forms a sealing surface through the full integration of the seal 13 with the terminal post 12 and the top cover, ensuring airtightness. The nano-injection molding process is relatively simple and cost-effective.

[0049] The performance of the technical solutions provided in the embodiments of the present application is evaluated below in combination with specific embodiments and comparative examples.

[0050] Example 1:

[0051] The area A1 of the first end face 121 of the pole 12 is mm 2 400mm 2 The location where the busbar is connected on the first end face 121 is circular, and the diameter D1 mm of the circle is 11 mm. The area of ​​the third end face 112 of the top cover 11 is M mm 2 7300mm 2 .

[0052] Example 2:

[0053] The area A1 of the first end face 121 of the pole 12 is mm 2 500mm 2 The location where the busbar is connected on the first end face 121 is circular, and the diameter D1 mm of the circle is 11 mm. The area of ​​the third end face 112 of the top cover 11 is M mm 2 7300mm 2 .

[0054] Example 3:

[0055] The area A1 of the first end face 121 of the pole 12 is mm 2 600mm 2 The location where the busbar is connected on the first end face 121 is circular, and the diameter D1 mm of the circle is 11 mm. The area of ​​the third end face 112 of the top cover 11 is M mm 2 7300mm 2 .

[0056] Example 4:

[0057] The area A1 of the first end face 121 of the pole 12 is mm 2 700mm 2 The location where the busbar is connected on the first end face 121 is circular, and the diameter D1 mm of the circle is 11 mm. The area of ​​the third end face 112 of the top cover 11 is M mm 2 7300mm2 .

[0058] Example 5:

[0059] The area A1 of the first end face 121 of the pole 12 is mm 2 400mm 2 The location where the busbar is connected on the first end face 121 is circular, and the diameter D1 mm of the circle is 11 mm. The area of ​​the third end face 112 of the top cover 11 is M mm 2 6500mm 2 .

[0060] Example 6:

[0061] The area A1 of the first end face 121 of the pole 12 is mm 2 500mm 2 The location where the busbar is connected on the first end face 121 is circular, and the diameter D1 mm of the circle is 11 mm. The area of ​​the third end face 112 of the top cover 11 is M mm 2 6500mm 2 .

[0062] Example 7:

[0063] The area A1 of the first end face 121 of the pole 12 is mm 2 600mm 2 The location where the busbar is connected on the first end face 121 is circular, and the diameter D1 mm of the circle is 11 mm. The area of ​​the third end face 112 of the top cover 11 is M mm 2 6500mm 2 .

[0064] Example 8:

[0065] The area A1 of the first end face 121 of the pole 12 is mm 2 700mm 2 The location where the busbar is connected on the first end face 121 is circular, and the diameter D1 mm of the circle is 11 mm. The area of ​​the third end face 112 of the top cover 11 is M mm 2 6500mm 2 .

[0066] Comparative Example 1:

[0067] The difference between this comparative example and the above-mentioned embodiment 1 is that the area A1 of the first end surface 121 of the pole 12 is mm 2 100mm 2 .

[0068] Comparative Example 2:

[0069] The difference between this comparative example and the above-mentioned embodiment 1 is that the area A1 of the first end surface 121 of the pole 12 is mm 2 120mm 2 .

[0070] Comparative Example 3:

[0071] The difference between this comparative example and the above-mentioned embodiment 5 is that the area A1 of the first end surface 121 of the pole 12 is mm 2 1500mm 2 .

[0072] Comparative Example 4:

[0073] The difference between this comparative example and the above-mentioned embodiment 1 is that the position on the first end surface 121 connected to the busbar is circular, and the diameter D1 mm of the circle is 6 mm.

[0074] Comparative Example 5:

[0075] The difference between this comparative example and the above-mentioned embodiment 1 is that the position on the first end surface 121 connected to the busbar is circular, and the diameter D1 mm of the circle is 18 mm.

[0076] The following table records the parameters of Examples 1 to 8 and the parameters of Comparative Examples 1 to 5 as well as the test results.

[0077] Result analysis: In the embodiment of the present application, the area of ​​the first end surface 121 of the pole 12 is set to A1mm 2 The area of ​​the third end surface 112 of the top cover 11 is M mm 2 The area of ​​the location where the busbar is connected on the first end surface 121 is S1 mm 2 ,satisfy: A1 ≥ 150 and 0.06 ≤ S1 / A1 ≤ 0.6. In this way, on the one hand, it is possible to avoid as much as possible the welding position on the first end face 121 being too close to the seal 13 due to the first end face 121 being too small, thereby reducing the risk of sealing failure of the seal 13. On the other hand, it is possible to avoid as much as possible the connection strength of the welding area failing to meet the requirements due to the first end face 121 being too large.

[0078] Example 9:

[0079] The area A2 of the second end face 122 of the pole 12 is mm 2 200mm 2 The position of the second end surface 122 connected to the connecting member 14 is circular, and the diameter D2 mm of the circle is 9 mm. The area of ​​the third end surface 112 of the top cover member 11 is M mm 27300mm 2 .

[0080] Example 10:

[0081] The area A2 of the second end face 122 of the pole 12 is mm 2 400mm 2 The position of the second end surface 122 connected to the connecting member 14 is circular, and the diameter D2 mm of the circle is 9 mm. The area of ​​the third end surface 112 of the top cover member 11 is M mm 2 7300mm 2 .

[0082] Example 11:

[0083] The area A2 of the second end face 122 of the pole 12 is mm 2 200mm 2 The position of the second end surface 122 connected to the connecting member 14 is circular, and the diameter D2 mm of the circle is 9 mm. The area of ​​the third end surface 112 of the top cover member 11 is M mm 2 5600mm 2 .

[0084] Example 12:

[0085] The area A2 of the second end face 122 of the pole 12 is mm 2 400mm 2 The position of the second end surface 122 connected to the connecting member 14 is circular, and the diameter D2 mm of the circle is 9 mm. The area of ​​the third end surface 112 of the top cover member 11 is M mm 2 5600mm 2 .

[0086] Example 13:

[0087] The area A2 of the second end face 122 of the pole 12 is mm 2 300mm 2 The position of the second end surface 122 connected to the connecting member 14 is circular, and the diameter D2 mm of the circle is 9 mm. The area of ​​the third end surface 112 of the top cover member 11 is M mm 2 6500mm 2 .

[0088] Example 14:

[0089] The area A2 of the second end face 122 of the pole 12 is mm 2 600mm 2The position of the second end surface 122 connected to the connecting member 14 is circular, and the diameter D2 mm of the circle is 9 mm. The area of ​​the third end surface 112 of the top cover member 11 is M mm 2 6500mm 2 .

[0090] Example 15:

[0091] The area A2 of the second end face 122 of the pole 12 is mm 2 400mm 2 The position of the second end surface 122 connected to the connecting member 14 is circular, and the diameter D2 mm of the circle is 9 mm. The area of ​​the third end surface 112 of the top cover member 11 is M mm 2 6500mm 2 .

[0092] Example 16:

[0093] The area A2 of the second end face 122 of the pole 12 is mm 2 200mm 2 The position of the second end surface 122 connected to the connecting member 14 is circular, and the diameter D2 mm of the circle is 9 mm. The area of ​​the third end surface 112 of the top cover member 11 is M mm 2 6500mm 2 .

[0094] Comparative Example 6:

[0095] The difference between this comparative example and the above-mentioned embodiment 9 is that the area A2 mm of the second end surface 122 of the pole 12 is 2 100mm 2 .

[0096] Comparative Example 7:

[0097] The difference between this comparative example and the above-mentioned embodiment 9 is that the area A2 mm of the second end surface 122 of the pole 12 is 2 120mm 2 .

[0098] Comparative Example 8:

[0099] The difference between this comparative example and the above embodiment 11 is that the area A2 mm of the second end surface 122 of the pole 12 is 2 1500mm 2 .

[0100] Comparative Example 9:

[0101] The difference between this comparative example and the above-mentioned embodiment 9 is that the position on the second end surface 122 connected to the connecting member 14 is circular, and the diameter D2 mm of the circle is 6 mm.

[0102] Comparative Example 10:

[0103] The difference between this comparative example and the above-mentioned embodiment 9 is that the position on the second end surface 122 connected to the connecting member 14 is circular, and the diameter D2 mm of the circle is 15 mm.

[0104] The following table records the parameters of Examples 9 to 16 and the parameters of Comparative Examples 6 to 10 as well as the test results.

[0105] Result analysis: In the embodiment of the present application, the area of ​​the second end surface 122 of the pole 12 is set to A2 mm 2 The area of ​​the third end surface 112 of the top cover 11 is M mm 2 The area of ​​the second end surface 122 where it is connected to the connector 14 is S2 mm. 2 ,satisfy: A2 ≥ 150 and 0.06 ≤ S2 / A2 ≤ 0.6. In this way, on the one hand, it is possible to avoid as much as possible the welding position on the second end surface 122 being too close to the seal 13 due to the second end surface 122 being too small, thereby reducing the risk of sealing failure of the seal 13. On the other hand, it is possible to avoid as much as possible the connection strength of the welding area failing to meet the requirements due to the second end surface 122 being too large.

[0106] The above is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application. All equivalent changes and modifications based on the shape, structure, characteristics and spirit described in the claims of the present application should be included in the scope of the claims of the present application.

Claims

1. A battery pack, comprising: A single cell battery comprises a shell and a top cover assembly, wherein the shell and the top cover assembly are connected to form a cavity for accommodating a cell; as well as A busbar electrically connected to the single battery; Wherein, the top cover assembly has a preset direction, and the top cover assembly comprises: A top cover member is provided with an assembly hole, and the assembly hole penetrates the top cover member along the preset direction; A pole, passing through the assembly hole, wherein the end surface of the pole in the preset direction is connected to the busbar, wherein a position on the end surface connected to the busbar is spaced from an outer edge of the end surface; and A sealing member is arranged between the pole and the top cover member.

2. The battery pack according to claim 1, wherein: The area of ​​the end surface of the pole in the preset direction is A mm 2 The area of ​​the end surface of the top cover in the preset direction is M mm 2 ,in 3. The battery pack according to claim 1, wherein: The area of ​​the end surface of the pole in the preset direction is A mm 2 , satisfying: A≥150.

4. The battery pack according to any one of claims 1 to 3, wherein: The end surface of the pole in the preset direction includes a first end surface and a second end surface, and the first end surface and the second end surface are arranged at an interval from each other in the preset direction; Among them, the first end face is connected to the bus, and the position on the first end face where the bus is connected is spaced from the outer edge of the first end face; the single battery also includes a connector, the pole is electrically connected to the battery cell through the connector, the second end face is connected to the connector, and the position on the second end face where the connector is connected is spaced from the outer edge of the second end face.

5. The battery pack according to claim 4, wherein: The pole comprises: A pole body, which is inserted into the assembly hole; and A limit portion is connected to one end of the pole body in the preset direction, and the limit portion faces away from The end face of the pole body is the first end face, the end face of the pole body facing away from the limiting portion is the second end face, and the limiting portion cooperates with the connecting member to clamp the top cover member to fix the pole to the top cover member.

6. The battery pack according to claim 4, wherein: The area of ​​the second end surface is smaller than the area of ​​the end surface of the connecting member facing the pole.

7. The battery pack according to claim 4, wherein: An area of ​​the first end surface is greater than an area of ​​the second end surface.

8. The battery pack according to claim 5, wherein: The sealing member comprises: A first sealing portion is arranged around the outer periphery of the pole body, and the first sealing portion is sandwiched between the pole body and the hole wall of the assembly hole; a second sealing portion connected to the first sealing portion, and the second sealing portion is disposed around the outer periphery of the limiting portion; and a third sealing portion connected to the first sealing portion, and the third sealing portion is sandwiched between the top cover and the connecting member; Wherein, the first sealing portion, the second sealing portion and the third sealing portion are an integral injection molding structure.

9. The battery pack according to claim 1, wherein: The area of ​​the end face is A mm 2 The area of ​​the position where the bus is connected on the end surface is S mm 2 , satisfying: 0.06≤S / A≤0.

6.

10. A battery pack comprising: A single battery comprises a shell, a top cover assembly, a battery cell and a connector, wherein the shell and the top cover assembly are connected to form a cavity for accommodating the battery cell, and the connector is electrically connected to the battery cell; Wherein, the top cover assembly has a preset direction, and the top cover assembly comprises: A top cover member is provided with an assembly hole, and the assembly hole penetrates the top cover member along the preset direction; A pole, passing through the assembly hole, wherein an end face of the pole in the preset direction is connected to the connector, wherein a position on the end face where the connector is connected is spaced from an outer edge of the end face; and A sealing member is arranged between the pole and the top cover member.

11. The battery pack according to claim 10, wherein: The area of ​​the end surface of the pole in the preset direction is A mm 2 The area of ​​the end surface of the top cover in the preset direction is M mm 2 ,in 12. The battery pack according to claim 10, wherein: The area of ​​the end surface of the pole in the preset direction is A mm 2 , satisfying: A≥150.

13. The battery pack according to claim 10, wherein: The area of ​​the end face is A mm 2 The area of ​​the end surface where the connector is connected is S mm 2 , satisfying: 0.06≤S / A≤0.

6.

14. An electrical device, wherein: It comprises a battery pack as claimed in any one of claims 1 to 13, wherein the battery pack is a power supply for the electrical device.

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