Battery

Abstract

The utility model provides a battery which comprises a shell, an insulation assembly and a pole assembly, the shell comprises a first shell wall, the insulation assembly comprises a first plastic part and a sealing part, the first plastic part abuts against the inner side of the first shell wall, the first shell wall is provided with a first avoiding hole, and the first plastic part is provided with a second avoiding hole coaxially communicated with the first avoiding hole; the pole assembly comprises a pole, the pole is sequentially inserted into the second receding hole and the first receding hole, the pole, the sealing part and the first plastic part are sequentially arranged from inside to outside in the radial direction of the pole, and projections of the pole, the sealing part and the first plastic part on the first shell wall are staggered. The battery disclosed by the utility model is relatively high in energy density.

Description

Technical Field

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

[0002] Batteries are a widely used electrochemical energy storage device. Using batteries as an energy source can obtain stable voltage and current, and they play a great role in all aspects of modern social life.

[0003] In the related art, a battery may include a shell and a battery cell, wherein the battery cell is arranged in the shell, and the current of the battery cell is conducted to the outside of the shell through the adapter plate / collector plate and the pole, wherein the pole is sleeved on the adapter plate / collector plate, and an upper plastic part, a lower plastic part and a sealing ring are required to be arranged between the battery cell, the pole and the adapter plate / collector plate to insulate and isolate the pole from the shell, the adapter plate / collector plate and the shell, and to seal the gap formed between the shell, the pole and the adapter plate / collector plate. However, in the related art, the upper plastic part, the lower plastic part and the sealing ring are all arranged along the axial direction of the pole, thereby increasing the axial dimension of the battery along the pole, thereby reducing the energy density of the battery. Utility Model Content

[0004] Based on this, the present application provides a battery to solve the deficiencies in the related art.

[0005] The present application provides a battery, comprising a shell, an insulating assembly and a pole assembly, wherein the shell comprises a first shell wall, the insulating assembly comprises a first plastic component and a sealing component, the first plastic component abuts against the inner side of the first shell wall, the first shell wall has a first avoidance hole, and the first plastic component has a second avoidance hole coaxially connected to the first avoidance hole;

[0006] The pole assembly includes a pole, which is inserted into the second avoidance hole and the first avoidance hole in sequence. The pole, the seal and the first plastic part are arranged in sequence from inside to outside along the radial direction of the pole, and the projections of the pole, the seal and the first plastic part on the first shell wall are staggered.

[0007] In a possible implementation manner, the inner side of the sealing member and the outer side of the sealing member abut against the pole and the first plastic member respectively.

[0008] In a possible implementation, a battery cell is further included, the pole assembly further includes a current collector, the battery cell is disposed in the housing, and the current collector is connected to the battery cell;

[0009] The busbar includes a protrusion and a platform portion that are connected to each other. The platform portion is arranged around the outer peripheral side of the protrusion. The platform portion is located between the first shell wall and the battery cell. The pole is sleeved on the protrusion and abuts against the side of the platform portion away from the battery cell. The first plastic part and the sealing part both abut against the side of the platform portion facing the first shell wall.

[0010] In a possible implementation, a side of the platform portion facing the first shell wall has a positioning groove, the positioning groove is arranged in a circle along the circumference of the pole, and the sealing member abuts against the positioning groove.

[0011] In a possible implementation, the pole assembly further includes a second plastic part and a welding ring, the welding ring includes a connecting portion and a welding portion, the welding portion is connected to the outer side of the connecting portion, and the connecting portion and the welding portion are staggered along the axial direction of the pole;

[0012] The connecting portion is connected to the second plastic part, the welding portion is welded to the first shell wall, the pole includes a first hollow column and a second hollow column that are coaxially connected, the second hollow column is located at one end of the first hollow column close to the first shell wall, the projection of the second hollow column on the first hollow column is located inside the first hollow column, the second plastic part is sleeved on the second hollow column, and the second plastic part abuts against the end face of the first hollow column facing the second hollow column.

[0013] In a possible implementation manner, the pole, the second plastic part and the welding ring are integrally formed.

[0014] In a possible implementation, one of the inner side wall of the second plastic part and the outer side wall of the second hollow column is provided with a first anti-twist block, and the other is provided with a first anti-twist groove, and the first anti-twist block is inserted into the first anti-twist groove;

[0015] And / or, one of the inner side wall of the welding ring and the outer side wall of the second plastic part is provided with a second anti-twist block, and the other is provided with a second anti-twist groove, and the second anti-twist block is inserted into the second anti-twist groove.

[0016] In a possible implementation, the inner side wall of the second hollow column is welded to the outer side wall of the protruding portion, a first weld is provided between the inner side wall of the second hollow column and the outer side wall of the protruding portion, and a penetration depth of the first weld is greater than or equal to 0.2 mm and less than or equal to 4 mm;

[0017] And / or, the weld width of the first weld is greater than or equal to 0.2 mm and less than or equal to 2 mm.

[0018] In a possible implementation, the first shell wall has a welding boss protruding toward the outer side of the shell body to form a concave cavity inside the first shell wall, the welding portion is located in the concave cavity, and the overlapping portion of the welding portion and the welding boss has a second weld;

[0019] Alternatively, the first shell wall has a welding sinker recessed toward the inner side of the shell, the first plastic part has a first sinker, the welding sinker is located inside the first sinker, the welding part is located inside the welding sinker, and a third weld is provided between the outer wall of the welding part and the inner wall of the welding sinker.

[0020] In a possible implementation, the penetration depth of the second weld is greater than the thickness of the first shell wall and less than or equal to the sum of the thickness of the first shell wall and the thickness of the weld portion;

[0021] And / or, the weld width of the second weld satisfies the requirement of being greater than or equal to 0.5 mm and less than or equal to 4 mm;

[0022] and / or, the penetration depth of the third weld is greater than the thickness of the weld portion and less than or equal to the sum of the thickness of the first shell wall and the thickness of the weld portion;

[0023] And / or, the weld width of the third weld is greater than or equal to 0.5 mm and less than or equal to 4 mm.

[0024] In a possible implementation, the protrusion includes a first boss and a second boss that are coaxially connected, the second boss is located at one end of the first boss close to the first shell wall, and a projection of the second boss on the first boss is located inside the first boss;

[0025] The second hollow column has a second sink at one end away from the first hollow column, and the first boss, the second boss and the second sink together define a weld receiving groove.

[0026] In a possible implementation, an extension dimension of the weld receiving groove along the axial direction of the pole is greater than or equal to 0.2 mm and less than or equal to 5 mm.

[0027] In a possible implementation, the bottom surface of the second sink facing the first hollow column is flush with the end surface of the first boss facing the second boss;

[0028] And / or, a surface of the second plastic part facing the outer side of the housing is flush with a surface of the second boss facing away from the first boss.

[0029] In a possible implementation, two ends of the sealing member along the axial direction of the pole are respectively in contact with the platform portion and the second plastic member.

[0030] In a possible implementation, the seal includes a first sealing ring and a second sealing ring that are coaxially connected, the second sealing ring is located at one end of the first sealing ring close to the first shell wall, and a projection of the second sealing ring on the first sealing ring is located inside the first sealing ring.

[0031] In a possible implementation manner, a side of the platform portion facing the battery cell has at least one of a convex region and a thinned region, and the thinned region is located on a side of the platform portion close to the convex region.

[0032] In a possible implementation, a ratio of a protrusion height of the protrusion area relative to the platform portion to a thickness of the platform portion is less than or equal to 2 / 3;

[0033] and / or, a ratio of a depression depth of the thinned area relative to the platform portion to a thickness of the platform portion is greater than or equal to 1 and less than or equal to 2 / 3;

[0034] and / or, a ratio of an extension dimension of the raised area along the radial direction of the pole to a thickness of the platform portion is greater than or equal to 2;

[0035] And / or, a ratio of an extension dimension of the thinned region along the radial direction of the pole to a thickness of the platform portion is greater than or equal to 2.

[0036] The battery provided by the present application includes a shell, an insulating component and a pole component, the shell includes a first shell wall, the insulating component includes a first plastic part and a seal, the first shell wall includes a first avoidance hole, the first plastic part includes a second avoidance hole, and the pole component includes a pole. The pole is used to lead out the current of the battery cell to establish a current channel between the battery and the external device, the first plastic part is used to insulate and isolate the battery cell and the first shell wall to prevent the battery from short circuiting, and the seal is used to seal the gap formed between the parts after the battery is assembled. The pole, the seal and the first plastic part are arranged in sequence from the inside to the outside along the radial direction of the pole, and the projections of the pole, the seal and the first plastic part on the first shell wall are staggered, so as to fully utilize the space along the radial direction of the pole of the battery for arranging the pole, the seal and the first plastic part, so as to avoid the pole, the seal and the first plastic part stacking in the axial direction of the pole of the battery, which causes the extension size of the battery along the axial direction of the pole to be too large. As a result, the extension size of the battery in the axial direction of the pole of the present application is small, and the energy density of the battery is high.

[0037] In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the battery provided by the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0040] Figure 2 for Figure 1 A top view of

[0041] Figure 3 for Figure 1 Exploded diagram of

[0042] Figure 4 for Figure 1Schematic diagram of the structure of the middle pole assembly and the insulation assembly;

[0043] Figure 5 for Figure 1 A schematic diagram of the internal structure of

[0044] Figure 6 for Figure 5 A partial enlarged view of the middle part;

[0045] Figure 7 for Figure 1 Another internal structure diagram of ;

[0046] Figure 8 for Figure 7 A partial enlarged view of point B in the middle;

[0047] Fig. 9 A schematic diagram of the structure of another battery provided in an embodiment of the present application;

[0048] Fig.10 for Fig. 9 A top view of

[0049] Fig.11 for Fig. 9 Exploded diagram of

[0050] Fig.12 for Fig. 9 Schematic diagram of the internal structure;

[0051] Fig.13 for Fig.12 A partial enlarged view of point C in the middle;

[0052] Fig.14 A schematic diagram of the structure of a pole assembly in a battery provided in an embodiment of the present application;

[0053] Fig.15 for Fig.14 Exploded diagram of

[0054] Fig.16 for Fig.14 Schematic diagram of the internal structure;

[0055] Fig.17 A schematic diagram of the structure of a current collector in a battery provided in an embodiment of the present application.

[0056] Description of reference numerals:

[0057] 100-shell; 110-first shell wall; 111-first avoidance hole; 112-welding boss; 113-welding sink;

[0058] 200 - insulation component; 210 - first plastic part; 211 - second avoidance hole; 212 - first sink; 220 - sealing member; 221 - first sealing ring; 222 - second sealing ring;

[0059] 300-pole assembly; 310-pole; 311-first hollow column; 312-second hollow column; 3121-first anti-twist groove; 3122-second sinking platform; 320-collector; 321-protruding portion; 3211-first boss; 3212-second boss; 322-platform portion; 3221-positioning groove; 3222-raised area; 3223-thinning area; 330-second plastic part; 331-first anti-twist block; 340-welding ring; 341-connecting portion; 342-welding portion; 343-second anti-twist groove;

[0060] 400-cell;

[0061] 500-first weld;

[0062] 600-second weld;

[0063] 700-third weld;

[0064] 800-Weld receiving groove. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0066] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0067] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are orientations or positional relationships based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0068] The terms "first", "second", "third" (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0069] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or display comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or display.

[0070] In the related art, a battery may include a shell and a battery cell, wherein the battery cell is arranged in the shell, and the current of the battery cell is conducted to the outside of the shell through the adapter plate / collector plate and the pole, wherein the pole is sleeved on the adapter plate / collector plate, and an upper plastic part, a lower plastic part and a sealing ring are required to be arranged between the battery cell, the pole and the adapter plate / collector plate to insulate and isolate the pole from the shell, the adapter plate / collector plate and the shell, and to seal the gap formed between the shell, the pole and the adapter plate / collector plate. However, in the related art, the upper plastic part, the lower plastic part and the sealing ring are all arranged along the axial direction of the pole, thereby increasing the axial dimension of the battery along the pole, thereby reducing the energy density of the battery.

[0071] In view of the above problems, the battery provided in the embodiment of the present application is arranged in sequence from the inside to the outside of the pole along the radial direction of the pole, and the projections of the pole, the seal and the first plastic part on the first shell wall are staggered with each other, so that the pole, the seal and the first plastic part are distributed along the radial direction of the pole, rather than along the axial direction of the pole, so that the extended dimensions of the pole, the seal and the first plastic part along the axial direction of the pole partially or completely overlap, thereby reducing the extended dimension of the battery along the axial direction of the pole, thereby solving the problem of low energy density of the battery in the related art.

[0072] The specific implementation of the battery provided in the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0073] Reference Figures 1 to 13 As shown, the present application provides a battery, including a shell 100, an insulating assembly 200 and a pole assembly 300, the shell 100 includes a first shell wall 110, the insulating assembly 200 includes a first plastic part 210 and a sealing part 220, the first plastic part 210 abuts against the inner side of the first shell wall 110, the first shell wall 110 has a first avoidance hole 111, and the first plastic part 210 has a second avoidance hole 211 coaxially connected to the first avoidance hole 111.

[0074] The pole assembly 300 includes a pole 310, which is inserted into the second avoidance hole 211 and the first avoidance hole 111 in sequence. The pole 310, the seal 220 and the first plastic part 210 are arranged in sequence from the inside to the outside along the radial direction of the pole 310, and the projections of the pole 310, the seal 220 and the first plastic part 210 on the first shell wall 110 are staggered with each other.

[0075] In the present application, the shell 100 is used to encapsulate the electrolyte and the battery cell 400, the pole assembly 300 is used to conduct the current of the battery cell 400 to establish a current channel between the battery cell 400 and other devices, and the insulating assembly 200 is used to insulate and isolate the positive electrode of the battery and the negative electrode of the battery to avoid direct contact between the positive electrode of the battery and the negative electrode of the battery and cause a battery short circuit.

[0076] Specifically, the insulating component 200 includes a first plastic part 210 and a sealing part 220, and the pole component 300 may include a pole 310, which is sequentially inserted into the first plastic part 210 and the first shell wall 110 and extends to the outside of the first shell wall 110 to connect with other devices, and the sealing part 220 is sleeved on the outside of the pole 310, so that the pole 310, the sealing part 220 and the first plastic part 210 can be sequentially arranged from the inside to the outside along the radial direction of the pole 310, and when arranged, the pole 310, the sealing part 220 and the first plastic part 210 can be arranged in sequence from the inside to the outside of the first shell wall 110. 10 are staggered with each other, that is, the pole 310, the seal 220 and the first plastic part 210 are not stacked on each other in the axial direction of the pole 310. Compared with the stacking arrangement of the seal 220 and the first plastic part 210 along the axial direction of the pole 310 in the related art, the battery of the embodiment of the present application makes full use of the space of the battery along the radial direction of the pole 310 to arrange the pole 310, the seal 220 and the first plastic part 210, so that after the battery is assembled, the extension dimension of the battery along the axial direction of the pole 310 is smaller, thereby improving the energy density of the battery.

[0077] It should be noted that the battery provided in the embodiment of the present application can be a cylindrical battery or a square battery. For the cylindrical battery, the first shell wall 110 has one pole 310, and for the square battery, the first shell wall 110 can have one or two poles 310, one of the two poles 310 is the positive pole, and the other is the negative pole. Except for the different polarities, the two poles 310 have the same structural form. Therefore, the embodiments of the present application will not be described separately.

[0078] The battery provided in the embodiment of the present application includes a shell 100, an insulating assembly 200 and a pole assembly 300, the shell 100 includes a first shell wall 110, the insulating assembly 200 includes a first plastic part 210 and a sealing part 220, the first shell wall 110 includes a first avoidance hole 111, the first plastic part 210 includes a second avoidance hole 211, and the pole assembly 300 includes a pole 310. The pole 310 is provided to conduct the current of the battery cell 400 so as to establish a current channel between the battery and an external device; the first plastic part 210 is provided to insulate and isolate the battery cell 400 and the first shell wall 110 so as to prevent a short circuit in the battery; the seal 220 is provided to seal the gap formed between the parts after the battery is assembled; the pole 310, the seal 220 and the first plastic part 210 are arranged in sequence from the inside to the outside along the radial direction of the pole 310, and the projections of the pole 310, the seal 220 and the first plastic part 210 on the first shell wall 110 are staggered with each other, so as to fully utilize the space of the battery along the radial direction of the pole 310 for arranging the pole 310, the seal 220 and the first plastic part 210, so as to avoid the pole 310, the seal 220 and the first plastic part 210 being stacked in the axial direction of the battery along the pole 310, thereby preventing the extension dimension of the battery along the axial direction of the pole 310 from being too large. Therefore, the extension dimension of the battery in the embodiment of the present application along the axial direction of the pole 310 is small, and the energy density of the battery is high.

[0079] Reference Figure 6 , Figure 8 and Fig.13 As shown, in a possible implementation, the inner side of the seal 220 and the outer side of the seal 220 are respectively in contact with the pole 310 and the first plastic part 210, that is, the projections of the pole 310, the seal 220 and the first plastic part 210 on the first shell wall 110 are sequentially adjacent. In this way, the seal 220 can seal the gap between the pole 310 and the first plastic part 210 in the radial direction of the pole 310, thereby preventing leakage of electrolyte.

[0080] Reference Figure 3 , Figure 4 , Figure 6 , Figure 8 , Fig.11 and Fig.13As shown, in a possible implementation, the battery of the embodiment of the present application further includes a battery cell 400, the pole assembly 300 further includes a busbar 320, the battery cell 400 is disposed in the housing 100, and the busbar 320 is connected to the battery cell 400. The first plastic part 210 is used to insulate and isolate the busbar 320 from the first housing wall 110 to prevent the busbar 320 from being short-circuited with the housing 100.

[0081] The busbar 320 includes a protrusion 321 and a platform portion 322 that are connected to each other. The platform portion 322 is arranged around the outer peripheral side of the protrusion 321. The platform portion 322 is located between the first shell wall 110 and the battery cell 400. The pole 310 is sleeved on the protrusion 321 and abuts against the side of the platform portion 322 away from the battery cell 400. The first plastic part 210 and the sealing part 220 both abut against the side of the platform portion 322 facing the first shell wall 110.

[0082] It can be understood that the battery cell 400 and the electrolyte are encapsulated in the shell 100, the battery cell 400 is used to react with the electrolyte to generate current, and the bus 320 is used to connect to the battery cell 400 and the pole 310, and then the current of the battery cell 400 is conducted out of the shell 100 through the bus 320 and the pole 310, wherein the bus 320 may include a protrusion 321, and the pole 310 is sleeved on the protrusion 321, so that the pole 310 and the bus 320 are assembled together, so that the pole 310 and the protrusion 321 are jointly inserted into the first avoidance hole 111 and the second avoidance hole 211.

[0083] In addition, the busbar 320 may include a platform portion 322, which is located between the first shell wall 110 and the battery cell 400. The first plastic part 210 and the seal 220 may be located between the platform portion 322 and the first shell wall 110, thereby insulating and isolating the first shell wall 110 and the battery cell 400, thereby preventing the battery cell 400 from contacting the shell 100 and causing a short circuit.

[0084] In the above-mentioned arrangement, the protrusion 321, the pole 310, the seal 220 and the first plastic part 210 are distributed along the radial direction of the pole 310, and the protrusion 321, the pole 310, the seal 220, any one of the first plastic part 210, the platform part 322 and the battery cell 400 are distributed along the axial direction of the pole 310. In this way, the space of the battery along the radial direction of the pole 310 and the space of the battery along the axial direction of the pole 310 can be reasonably utilized, thereby improving the energy density of the battery.

[0085] Reference Figure 4 , Figure 6 and Figure 8As shown, in some embodiments, the platform portion 322 has a positioning groove 3221 on one side facing the first shell wall 110 . The positioning groove 3221 is arranged along the circumference of the pole 310 , and the sealing member 220 abuts against the positioning groove 3221 .

[0086] In this way, when assembling the sealing member 220 , the sealing member 220 can be preliminarily positioned through the positioning groove 3221 , so that the assembly of the sealing member 220 can be more accurate and convenient, thereby improving the assembly efficiency and assembly accuracy of the battery.

[0087] In addition, since the platform portion 322 can be connected to the battery cell 400 by penetration welding, the welding position of the two can be set in the positioning groove 3221. In this way, the welding seam between the platform portion 322 and the battery cell 400 can be located in the positioning groove 3221, thereby avoiding the welding seam protruding from the platform portion 322, and the seal 220 located in the positioning groove 3221 can prevent welding slag and debris from falling into the battery cell 400, thereby improving the safety of the battery.

[0088] Reference Figure 3 , Figure 4 , Figure 6 , Figure 8 , Fig.14 and Fig.15 As shown, in a possible implementation, the pole assembly 300 further includes a second plastic part 330 and a welding ring 340, the welding ring 340 includes a connecting portion 341 and a welding portion 342, the welding portion 342 is connected to the outside of the connecting portion 341, and the connecting portion 341 and the welding portion 342 are staggered along the axial direction of the pole 310. The second plastic part 330 is used to insulate and isolate the pole 310 and the first shell wall 110, thereby preventing the pole 310 and the shell 100 from being short-circuited.

[0089] The connecting portion 341 is connected to the second plastic part 330, the welding portion 342 is welded to the first shell wall 110, the pole 310 includes a first hollow column 311 and a second hollow column 312 that are coaxially connected, the second hollow column 312 is located at one end of the first hollow column 311 close to the first shell wall 110, the projection of the second hollow column 312 in the first hollow column 311 is located inside the first hollow column 311, the second plastic part 330 is sleeved on the second hollow column 312, and the second plastic part 330 abuts against the end surface of the first hollow column 311 facing the second hollow column 312.

[0090] In the above-mentioned setting, the welding ring 340 is used to be welded with the first shell wall 110, and then the first shell wall 110 is sealed by welding. The second plastic part 330 is used to insulate and isolate the welding ring 340 and the pole 310, and then prevent the welding ring 340 and the pole 310 from directly contacting each other, thereby preventing the first shell wall 110 from indirectly contacting the pole 310 through the welding ring 340 and causing a short circuit.

[0091] Specifically, the welding ring 340 may include a connecting portion 341 and a welding portion 342 connected to each other, the welding portion 342 is located outside the connecting portion 341, and the connecting portion 341 and the welding portion 342 are staggered along the axial direction of the pole 310, that is, the welding ring 340 may include an inner ring (connecting portion 341) and an outer ring (welding portion 342), and the inner ring protrudes toward the outside of the housing 100 relative to the outer ring. In this way, the welding ring 340 can be connected to the second plastic part 330 through the connecting portion 341, and connected to the first housing wall 110 through the welding portion 342.

[0092] In addition, the pole 310 may include two parts along its own axial direction, namely, a first hollow column 311 and a second hollow column 312. The first hollow column 311 and the second hollow column 312 are jointly sleeved on the protrusion 321. Since the first hollow column 311 and the second hollow column 312 form a step shape, after the second plastic part 330 is sleeved on the second hollow column 312, the second plastic part 330 can abut against the end face of the first hollow column 311 facing the second hollow column 312, thereby limiting the position of the second plastic part 330 along the axial direction of the pole 310.

[0093] In a possible implementation, the pole 310, the second plastic part 330 and the welding ring 340 are integrally formed. It should be noted that the pole 310 and the welding ring 340 can be made of metal, and the second plastic part 330 can be made of plastic injection molding. After the pole 310 and the welding ring 340 are formed by metal processing, the pole 310, the second plastic part 330 and the welding ring 340 are integrally injection molded, which can reduce the probability of relative torsion between the pole 310 and the welding ring 340, and reduce the processing cost of the pole assembly 300.

[0094] Reference Fig.15 and Fig.16 As shown, in some embodiments, one of the inner side wall of the second plastic part 330 and the outer side wall of the second hollow column 312 is provided with a first anti-twist block 331, and the other is provided with a first anti-twist groove 3121, and the first anti-twist block 331 is inserted into the first anti-twist groove 3121. And / or, one of the inner side wall of the welding ring 340 and the outer side wall of the second plastic part 330 is provided with a second anti-twist block, and the other is provided with a second anti-twist groove 343, and the second anti-twist block is inserted into the second anti-twist groove 343.

[0095] For example, the inner wall of the second plastic part 330 has a first anti-twist block 331, and the outer wall of the second hollow column 312 has a first anti-twist groove 3121, or the inner wall of the second plastic part 330 has a first anti-twist groove 3121, and the outer wall of the second hollow column 312 has a first anti-twist block 331. In this way, the anti-twist performance between the second plastic part 330 and the pole 310 can be improved by the cooperation between the first anti-twist block 331 and the first anti-twist groove 3121, thereby preventing relative torsion between the second plastic part 330 and the pole 310.

[0096] For another example, the outer wall of the second plastic part 330 is provided with a second anti-twist block, and the inner wall of the welding ring 340 is provided with a second anti-twist groove 343, or the outer wall of the second plastic part 330 is provided with a second anti-twist groove 343, and the inner wall of the welding ring 340 is provided with a second anti-twist block. The second anti-twist block and the second anti-twist groove 343 cooperate with each other, so that the anti-twist performance between the second plastic part 330 and the welding ring 340 can be improved, thereby preventing relative torsion between the second plastic part 330 and the welding ring 340.

[0097] Reference Figure 6 and Figure 8 As shown, in a possible implementation, the inner wall of the second hollow column 312 is welded to the outer wall of the protrusion 321, and a first weld 500 is provided between the inner wall of the second hollow column 312 and the outer wall of the protrusion 321, and the penetration depth of the first weld 500 is greater than or equal to 0.2 mm and less than or equal to 4 mm. And / or, the penetration width of the first weld 500 is greater than or equal to 0.2 mm and less than or equal to 2 mm.

[0098] In this way, the pole 310 and the protrusion 321 can be welded together by butt welding, and then the second hollow column 312 and the protrusion 321 are connected together by the first weld 500, and the gap between the inner wall of the second hollow column 312 and the outer wall of the protrusion 321 is sealed. In addition, connecting the pole 310 and the protrusion 321 by welding can also improve the anti-torsion performance between the pole 310 and the protrusion 321.

[0099] For example, the penetration depth of the first weld 500 can be any one of 0.2mm, 0.5mm, 1mm, 2mm, 4mm or within any two numerical ranges, and / or the weld width of the first weld 500 can be any one of 0.2mm, 0.4mm, 0.6mm, 1mm, 2mm or within any two numerical ranges. Such an arrangement can ensure that the first weld 500 has sufficient welding strength and good sealing performance.

[0100] Reference Figure 6As shown, in some embodiments, the first shell wall 110 has a welding boss 112 protruding toward the outside of the shell 100 to form a cavity on the inner side of the first shell wall 110, the welding portion 342 is located in the cavity, and the overlapping portion of the welding portion 342 and the welding boss 112 has a second weld 600.

[0101] In this arrangement, the welding boss 112 is placed on the welding portion 342, and then the welding boss 112 and the welding portion 342 are welded by penetration welding, thereby forming a second weld 600 at the overlapping portion of the welding boss 112 and the welding portion 342. At the same time, the second weld 600 can seal the gap between the welding boss 112 and the welding portion 342.

[0102] Reference Figure 8 As shown, or, in other embodiments, the first shell wall 110 has a welding sinker 113 recessed toward the inner side of the shell 100, the first plastic part 210 has a first sinker 212, the welding sinker 113 is located in the first sinker 212, the welding portion 342 is located in the welding sinker 113, and a third weld 700 is provided between the outer wall of the welding portion 342 and the inner wall of the welding sinker 113.

[0103] In this embodiment, the outer wall of the welding portion 342 and the inner wall of the welding sink 113 are welded by butt welding, thereby forming a third weld 700 between the outer wall of the welding portion 342 and the inner wall of the welding sink 113. At the same time, the third weld 700 can also seal the gap between the welding portion 342 and the welding sink 113.

[0104] It should be noted that the welding connection method between the first shell wall 110 and the welding portion 342 can be selected as needed, and the embodiment of the present application is not limited to this.

[0105] In a specific implementation, the penetration depth of the second weld 600 is greater than the thickness of the first shell wall 110, and less than or equal to the sum of the thickness of the first shell wall 110 and the thickness of the weld portion 342. And / or, the weld width of the second weld 600 satisfies greater than or equal to 0.5 mm and less than or equal to 4 mm. And / or, the penetration depth of the third weld 700 is greater than the thickness of the weld portion 342, and less than or equal to the sum of the thickness of the first shell wall 110 and the thickness of the weld portion 342. And / or, the weld width of the third weld 700 is greater than or equal to 0.5 mm and less than or equal to 4 mm.

[0106] Such an arrangement can ensure that the second weld 600 has sufficient penetration depth and width, thereby effectively sealing the connection between the welding boss 112 and the welding portion 342, and the third weld 700 has sufficient penetration depth and width, thereby effectively sealing the connection between the welding sink 113 and the welding portion 342.

[0107] The thickness of the first shell wall 110 may be in the range of 0.1 mm to 2 mm, and the thickness of the welding portion 342 may be in the range of 0.1 mm to 2 mm.

[0108] Exemplarily, the penetration depth of the second weld 600 may be any one of 0.11mm, 0.2mm, 1mm, 2mm, 3mm, 4mm or any two numerical ranges. And / or, the weld width of the second weld 600 may be any one of 0.5mm, 1mm, 2mm, 3mm, 4mm or any two numerical ranges. And / or, the penetration depth of the third weld 700 may be any one of 0.11mm, 0.3mm, 1.5mm, 2mm, 2.5mm, 4mm or any two numerical ranges. And / or, the weld width of the third weld 700 may be any one of 0.5mm, 1.5mm, 2.5mm, 3mm, 4mm or any two numerical ranges.

[0109] Reference Figure 4 , Figure 6 and Figure 8 As shown, in a possible implementation, the protrusion 321 includes a first boss 3211 and a second boss 3212 that are coaxially connected, the second boss 3212 is located at one end of the first boss 3211 close to the first shell wall 110, and the projection of the second boss 3212 on the first boss 3211 is located inside the first boss 3211. The second hollow column 312 has a second sink 3122 at one end away from the first hollow column 311, and the first boss 3211, the second boss 3212 and the second sink 3122 jointly define a weld receiving groove 800.

[0110] Since the second hollow column 312 is sleeved on the protruding portion 321 and the second hollow column 312 is fixedly connected to the protruding portion 321 through the second weld 600 , the pole 310 and the busbar 320 are assembled together. Since the second weld 600 protrudes a certain height relative to the second hollow column 312, in order to avoid the protruding part of the second weld 600 increasing the extension dimension of the battery along the axial direction of the pole 310, a second countersunk platform 3122 can be set at the end of the second hollow column 312 away from the first hollow column 311, and the protruding portion 321 is set as two bosses along the axial direction of the pole 310, namely the first boss 3211 and the second boss 3212. In this way, the second hollow column 312 is sleeved on the second boss 3212, and the first boss 3211, the second boss 3212 and the second countersunk platform 3122 jointly define a weld receiving groove 800, so that the second weld 600 is located in the weld receiving groove 800, and does not protrude from the end face of the second hollow column 312 away from the first hollow column 311 or the end face of the first boss 3211 away from the second boss 3212.

[0111] In some embodiments, the extension dimension of the weld receiving groove 800 along the axial direction of the pole 310 is greater than or equal to 0.2 mm and less than or equal to 5 mm.

[0112] Such a configuration can enable the welding protrusion of the second welding seam 600 to be completely received in the welding seam receiving groove 800, so as to prevent the welding protrusion of the second welding seam 600 from increasing the invalid height of the battery.

[0113] In a possible implementation, the bottom surface of the second sink 3122 facing the first hollow column 311 is flush with the end surface of the first boss 3211 facing the second boss 3212. In this way, the effective penetration depth and effective penetration width of the second weld 600 can be increased, thereby improving the welding strength and sealing performance of the second weld 600.

[0114] It should be noted that if one of the surface of the second plastic part 330 facing the outside of the housing 100 and the surface of the second boss 3212 facing away from the first boss 3211 is higher and the other is lower, the extension dimension of the battery along the axial direction of the pole 310 will increase, thereby reducing the energy density of the battery. Therefore, in some embodiments, the surface of the second plastic part 330 facing the outside of the housing 100 is flush with the surface of the second boss 3212 facing away from the first boss 3211.

[0115] In a possible implementation, the two ends of the seal 220 along the axial direction of the pole 310 are respectively abutted against the platform portion 322 and the second plastic part 330. It is understandable that after the battery is assembled, the two sides of the seal 220 along the radial direction of the pole 310 can be respectively abutted against the first hollow column 311 and the second avoidance hole 211, and the two ends of the seal 220 along the axial direction of the pole 310 can be respectively abutted against the platform portion 322 and the second plastic part 330, so that the surface of the seal 220 can be abutted against the parts adjacent to it, thereby effectively sealing the gap formed between the first plastic part 210, the second plastic part 330, the pole 310 and the bus 320.

[0116] When the first shell wall 110 has a welding boss 112 , the seal 220 may abut between the platform portion 322 and the welding portion 342 . When the first shell wall 110 has a welding sink 113 , the seal 220 may abut between the platform portion 322 and the welding sink 113 .

[0117] Reference Figure 4 As shown, in a specific implementation, the seal 220 includes a first sealing ring 221 and a second sealing ring 222 which are coaxially connected. The second sealing ring 222 is located at one end of the first sealing ring 221 close to the first shell wall 110 , and the projection of the second sealing ring 222 on the first sealing ring 221 is located inside the first sealing ring 221 .

[0118] Such an arrangement allows the seal 220 to have at least 6 sealing surfaces adjacent to each other in sequence, so that the sealing surface of the seal 220 can abut against the second plastic part 330, the pole 310, the platform part 322, the first plastic part 210, the welding part 342 / welding sink 113, thereby improving the sealing performance of the battery.

[0119] Reference Fig.17 As shown, in a possible implementation, the side of the platform portion 322 facing the battery cell 400 has at least one of a raised area 3222 and a thinned area 3223 , and the thinned area 3223 is located on a side of the raised area 3222 close to the protruding portion 321 .

[0120] It can be understood that the positioning groove 3221 can be formed by directly notching the side of the platform portion 322 away from the battery cell 400, or, when the positioning groove 3221 is formed by stamping, the positioning groove 3221 will be formed on the side of the platform portion 322 away from the battery cell 400, and the protrusion area 3222 will be formed on the side of the platform portion 322 facing the battery cell 400. In addition, in order to facilitate the stamping of the protrusion 321, before stamping, the central part of the busbar 320 on the side facing the battery cell 400 can be thinned as a whole, thereby facilitating the stamping of the protrusion 321 and ensuring the flatness of the surface of the platform portion 322 facing the battery cell 400. After stamping, a thinning area 3223 is formed on the inner side of the platform portion 322 close to the protrusion 321. When the battery is overcurrent, the thinning area 3223 is easy to be melted due to its thin thickness, thereby playing a role in overcurrent protection.

[0121] It should be noted that the protrusion height of the protrusion area 3222 cannot be too large to avoid increasing the overall thickness of the platform part 322, thereby avoiding increasing the extension size of the battery along the axial direction of the pole 310. If the depth of the thinning area 3223 is large, the bottom wall thickness of the thinning area 3223 will be excessively reduced, thereby reducing the structural strength of the busbar 320. Therefore, in some embodiments, the ratio of the protrusion height of the protrusion area 3222 relative to the platform part 322 to the thickness of the platform part 322 is less than or equal to 2 / 3. And / or, the ratio of the recessed depth of the thinning area 3223 relative to the platform part 322 to the thickness of the platform part 322 is less than or equal to 2 / 3.

[0122] And / or, the ratio of the radial extension of the raised area 3222 along the pole 310 to the thickness of the platform portion 322 is greater than or equal to 2. With such configuration, the positioning groove 3221 can have enough space along the radial direction of the pole 310 to accommodate the seal 220 .

[0123] And / or, the ratio of the extension dimension of the thinned area 3223 along the radial direction of the pole 310 to the thickness of the platform portion 322 is greater than or equal to 2. In this way, the thinned area 3223 can at least start from the protruding portion 321 and extend outward along the radial direction of the pole 310, and even extend to the raised area 3222, so as to facilitate stamping to form the protruding portion 321.

[0124] Exemplarily, the ratio of the protrusion height of the protrusion area 3222 relative to the platform part 322 to the thickness of the platform part 322 may be any one of 1 / 3, 2 / 3, 1 / 5, 1 / 10 or any two numerical ranges. And / or, the ratio of the depression depth of the thinning area 3223 relative to the platform part 322 to the thickness of the platform part 322 is greater than or equal to the ratio may be any one of 1 / 3, 2 / 3, 1 / 6, 1 / 10 or any two numerical ranges. And / or, the ratio of the radial extension dimension of the protrusion area 3222 along the pole 310 to the thickness of the platform part 322 may be any one of 2, 3, 4, 5, 10 or any two numerical ranges. And / or, the ratio of the radial extension dimension of the thinning area 3223 along the pole 310 to the thickness of the platform part 322 may be any one of 2, 2.5, 4, 6, 10 or any two numerical ranges.

[0125] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: The invention comprises a shell, an insulating assembly and a pole assembly, wherein the shell comprises a first shell wall, the insulating assembly comprises a first plastic component and a sealing component, the first plastic component abuts against the inner side of the first shell wall, the first shell wall has a first avoidance hole, and the first plastic component has a second avoidance hole coaxially connected to the first avoidance hole; The pole assembly includes a pole, which is inserted into the second avoidance hole and the first avoidance hole in sequence. The pole, the seal and the first plastic part are arranged in sequence from inside to outside along the radial direction of the pole, and the projections of the pole, the seal and the first plastic part on the first shell wall are staggered with each other.

2. The battery according to claim 1, characterized in that The inner side of the sealing member and the outer side of the sealing member abut against the pole and the first plastic member respectively.

3. The battery according to claim 1 or 2, characterized in that: It also includes a battery cell, the pole assembly also includes a busbar, the battery cell is arranged in the shell, and the busbar is connected to the battery cell; The busbar comprises a protrusion and a platform portion which are connected to each other, wherein the platform portion is arranged around the outer peripheral side of the protrusion, and the platform portion is located between the first shell wall and the battery cell. The pole is sleeved on the protrusion and abuts against a side of the platform portion which is away from the battery cell, and the first plastic part and the sealing part both abut against a side of the platform portion which is toward the first shell wall.

4. The battery according to claim 3, characterized in that The platform portion has a positioning groove on one side facing the first shell wall. The positioning groove is arranged in a circle along the circumference of the pole, and the sealing member abuts against the positioning groove.

5. The battery according to claim 3, characterized in that The pole assembly further includes a second plastic part and a welding ring, wherein the welding ring includes a connecting portion and a welding portion, wherein the welding portion is connected to the outer side of the connecting portion, and the connecting portion and the welding portion are staggered along the axial direction of the pole; The connecting portion is connected to the second plastic part, the welding portion is welded to the first shell wall, the pole includes a first hollow column and a second hollow column that are coaxially connected, the second hollow column is located at an end of the first hollow column away from the battery core, the projection of the second hollow column on the first hollow column is located inside the first hollow column, the second plastic part is sleeved on the second hollow column, and the second plastic part abuts against the end face of the first hollow column facing the second hollow column.

6. The battery according to claim 5, characterized in that The pole, the second plastic part and the welding ring are integrally formed.

7. The battery according to claim 5 or 6, characterized in that: One of the inner side wall of the second plastic part and the outer side wall of the second hollow column is provided with a first anti-twist block, and the other is provided with a first anti-twist groove, and the first anti-twist block is inserted into the first anti-twist groove; And / or, one of the inner side wall of the welding ring and the outer side wall of the second plastic part is provided with a second anti-twist block, and the other is provided with a second anti-twist groove, and the second anti-twist block is inserted into the second anti-twist groove.

8. The battery according to claim 5, characterized in that The inner side wall of the second hollow column is welded to the outer side wall of the protruding portion, and a first weld is formed between the inner side wall of the second hollow column and the outer side wall of the protruding portion, and the penetration depth of the first weld is greater than or equal to 0.2 mm and less than or equal to 4 mm; And / or, the weld width of the first weld is greater than or equal to 0.2 mm and less than or equal to 2 mm.

9. The battery according to claim 5, characterized in that The first shell wall has a welding boss protruding toward the outer side of the shell body to form a concave cavity inside the first shell wall, the welding portion is located in the concave cavity, and the overlapping portion of the welding portion and the welding boss has a second weld; Alternatively, the first shell wall has a welding sinker recessed toward the inner side of the shell, the first plastic part has a first sinker, the welding sinker is located inside the first sinker, the welding part is located inside the welding sinker, and a third weld is provided between the outer wall of the welding part and the inner wall of the welding sinker.

10. The battery according to claim 9, characterized in that The penetration depth of the second weld is greater than the thickness of the first shell wall and less than or equal to the sum of the thickness of the first shell wall and the thickness of the weld portion; And / or, the weld width of the second weld satisfies the requirement of being greater than or equal to 0.5 mm and less than or equal to 4 mm; And / or, the penetration depth of the third weld is greater than the thickness of the weld portion and less than or equal to the sum of the thickness of the first shell wall and the thickness of the weld portion; And / or, the weld width of the third weld is greater than or equal to 0.5 mm and less than or equal to 4 mm.

11. The battery according to claim 5, characterized in that The protrusion includes a first boss and a second boss which are coaxially connected, the second boss is located at an end of the first boss away from the battery core, and a projection of the second boss on the first boss is located inside the first boss; The second hollow column has a second sink at one end away from the first hollow column, and the first boss, the second boss and the second sink together define a weld receiving groove.

12. The battery according to claim 11, characterized in that The extension dimension of the weld receiving groove along the axial direction of the pole is greater than or equal to 0.2 mm and less than or equal to 5 mm.

13. The battery according to claim 11, characterized in that The bottom surface of the second sink facing the first hollow column is flush with the end surface of the first boss facing the second boss; And / or, a surface of the second plastic part facing the outer side of the housing is flush with a surface of the second boss facing away from the first boss.

14. The battery according to claim 5, characterized in that Two ends of the sealing member along the axial direction of the pole are respectively in contact with the platform portion and the second plastic member.

15. The battery according to claim 1 or 2, characterized in that: The sealing member comprises a first sealing ring and a second sealing ring which are coaxially connected. The second sealing ring is located at one end of the first sealing ring close to the first shell wall, and a projection of the second sealing ring on the first sealing ring is located inside the first sealing ring.

16. The battery according to claim 3, characterized in that The side of the platform portion facing the battery core has at least one of a convex area and a thinned area, and the thinned area is located on a side of the platform portion close to the convex portion.

17. The battery according to claim 16, characterized in that The ratio of the protrusion height of the protrusion area relative to the platform portion to the thickness of the platform portion is greater than or equal to 2 / 3; and / or, a ratio of a depression depth of the thinned area relative to the platform portion to a thickness of the platform portion is less than or equal to 2 / 3; and / or, a ratio of an extension dimension of the convex area along the radial direction of the pole to a thickness of the platform portion is greater than or equal to 2; And / or, a ratio of an extension dimension of the thinned region along the radial direction of the pole to a thickness of the platform portion is greater than or equal to 2.

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