Pole assembly and lithium battery

Abstract

The invention relates to the technical field of batteries, in particular to a pole assembly and a lithium battery. The pole assembly comprises a pole body and an adapter block, the adapter block is used for being arranged on the inner side of a battery cover plate to abut against the inner side of the battery cover plate, a first through hole is formed in the battery cover plate, and a second through hole coaxial with the first through hole is formed in the adapter block. The pole column body comprises a plate body part and a column body part which are vertically connected, the pole column body is arranged on the outer side of the battery cover plate, and the column body part penetrates through the battery cover plate through the first through hole and then extends into the second through hole of the adapter block until the plate body part abuts against the outer side surface of the battery cover plate; and then the post body part and the switching block are subjected to abutted seam welding along the circumferential direction of the second through hole, so that the post body is mounted on the battery cover plate on the premise of ensuring the structural strength, a pre-riveting procedure is omitted, the cost is reduced, the anti-extrusion capability of the whole structure is improved, and the failure risk of the mechanism is greatly reduced.

Description

Technical Field

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

[0002] The pole of a lithium-ion battery is usually located on the cover plate at the end of the battery. At present, the pole is installed on the cover plate by setting a rivet block on one side of the cover plate and setting the pole on the other side of the cover plate. The pole needs to pass through the cover plate and pre-rivet with the rivet block first, and then weld with the rivet block. The whole installation process is complex and costly. In addition, the rivet block is usually located on the side of the cover plate facing the outside of the battery. The cover plate in the battery module or battery pack is often subjected to the extrusion force from the outside to the inside acting vertically on the cover plate, resulting in the risk of the pole and the rivet block falling off. Summary of the invention

[0003] The object of the present invention is to provide a pole assembly and a lithium battery, so as to simplify the installation process of the pole to a certain extent, reduce the cost, and improve the anti-extrusion ability.

[0004] The present invention provides a pole assembly, comprising a pole body and a transfer block;

[0005] The adapter block is used to be insulated and abutted against one side of the battery cover plate, the battery cover plate is provided with a first through hole, the adapter block is provided with a second through hole, and the first through hole is coaxial with the second through hole;

[0006] The pole body comprises a plate body and a column body connected vertically, so that the pole body is T-shaped, the plate body is insulated and abutted against the other side of the battery cover, the column body passes through the first through hole and the second through hole, and the column body is welded and connected to the adapter block;

[0007] The depth of the second through hole is h, 0.8 mm ≤ h ≤ 3 mm; and / or the penetration depth of the welding area between the column portion and the adapter block is d, d ≥ 0.3 mm;

[0008] h and d satisfy: 0.3≤d / h≤1.

[0009] Furthermore, the pole assembly further comprises a first insulating member, and the plate body abuts against the battery cover through the first insulating member;

[0010] The first insulating member is formed with a first flange, the first flange surrounds at least a portion of the outer side of the column portion in the circumferential direction and extends into the first through hole;

[0011] The first insulating member is formed with a second flange, and the second flange surrounds at least a portion of the outer side of the plate body in the circumferential direction.

[0012] Furthermore, the pole assembly also includes a second insulating member, and the adapter block abuts against the battery cover through the second insulating member.

[0013] Furthermore, the pole assembly also includes a seal, which is annular and surrounds the outer side of the column portion, and the adapter block abuts against the battery cover through the seal.

[0014] A positioning protrusion is formed on one side edge of the sealing member in the radial direction, and the positioning protrusion is inserted into the first through hole.

[0015] Furthermore, a first inclined surface is formed on a side wall of the second through hole facing the battery cover, so that an end of the second through hole facing the battery cover is expanded;

[0016] A second inclined surface is formed on the side wall of the column portion, and the second inclined surface abuts against the first inclined surface.

[0017] Furthermore, a sink is formed on one side of the adapter block away from the battery cover, and the second through hole passes through the bottom wall of the sink;

[0018] The depth of the sink is a, 0.2mm≤a≤2mm;

[0019] And / or, the distance between the side wall of the sink and the side wall of the second through hole is b, 0.5 mm ≤ b ≤ 3 mm.

[0020] Furthermore, a transition arc is formed at the transition between the plate body and the column body;

[0021] The radius of the transition arc is R, R≤2mm.

[0022] Furthermore, the pole body is integrally stamped or pressed;

[0023] And / or, when the pole body is used as a negative pole, the adapter block is a copper adapter block, the pole body is a copper-aluminum composite pole, and the position where the column part and the adapter block are welded is made of copper;

[0024] And / or, when the pole body is used as a positive pole, the adapter block is an aluminum adapter block, and the pole body is an aluminum pole.

[0025] The present invention also provides a lithium battery, comprising any one of the above-mentioned pole assemblies.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The pole assembly provided by the present invention includes a pole body and an adapter block, the side of the battery cover plate facing the inside of the battery is the inner side of the battery cover plate, the side of the battery cover plate facing the outside of the battery is the outer side of the battery cover plate, and a first through hole penetrating the battery cover plate is provided on the battery cover plate; the adapter block is used to be arranged on the inner side of the battery cover plate and abut against the battery cover plate, and a second through hole is provided on the adapter block, and the second through hole is coaxially arranged opposite to the first through hole. The pole body is T-shaped, including a plate body portion and a column portion vertically connected. When installing the pole body, the pole body is placed on the outer side of the battery cover plate, so that the column portion of the pole body passes through the battery cover plate through the first through hole and then extends into the second through hole of the adapter block until the plate portion of the pole body abuts against the outer surface of the battery cover plate, and then the column portion and the adapter block are seam-welded along the circumference of the second through hole, thereby completing the installation of the pole body on the battery cover plate.

[0028] Compared with the existing installation method of riveting the pole body and the rivet block before welding, under the premise of ensuring the structural strength, the pre-riveting process is omitted in this application, which simplifies the installation process. Moreover, since the pre-riveting process is omitted, there is no need to process the riveted structure that cooperates with each other on the pole body and the adapter block, which reduces the overall processing cost. At the same time, the area where the pole body and the adapter block are welded in this application is located on the inner side of the cover plate, which makes it difficult for the pole body and the adapter block to fall off when the cover plate is subjected to the extrusion force acting vertically on the cover plate from the outside to the inside, thereby improving the anti-extrusion ability of the pole assembly and the lithium battery as a whole, and greatly reducing the risk of mechanism failure.

[0029] The present invention also provides a lithium battery, comprising the pole assembly, so the lithium battery also has the beneficial effects of the pole assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 An exploded schematic diagram of the assembly of a pole assembly and a battery cover provided by an embodiment of the present invention;

[0032] Figure 2 A cross-sectional schematic diagram of the assembly of a pole assembly and a battery cover plate provided by an embodiment of the present invention;

[0033] Figure 3 A schematic diagram of the structure of a switching block provided in an embodiment of the present invention;

[0034] Figure 4A three-dimensional schematic diagram of a pole body provided by an embodiment of the present invention;

[0035] Figure 5 A cross-sectional schematic diagram of a pole body provided by an embodiment of the present invention;

[0036] Figure 6 A cross-sectional schematic diagram of another pole body provided by an embodiment of the present invention;

[0037] Figure 7 A cross-sectional schematic diagram of another pole body provided by an embodiment of the present invention;

[0038] Figure 8 A cross-sectional schematic diagram of another pole body provided by an embodiment of the present invention;

[0039] Fig. 9 for Figure 2 Enlarged view of point A in the middle;

[0040] Fig.10 for Figure 3 Enlarged view of point B in the middle.

[0041] Reference numerals:

[0042] 1-battery cover, 11-first through hole, 2-pole body, 21-plate body, 22-column body, 23-second inclined surface, 3-first insulating member, 4-second insulating member, 5-sealing member, 51-positioning protrusion, 6-adapter block, 61-first inclined surface, 62-second through hole, 63-sunk platform. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0044] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0045] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, 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, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] Refer to the following Figures 1 to 10 The present invention describes a pole assembly and a lithium battery according to some embodiments of the present application.

[0049] The present application provides a pole assembly, such as Figures 1 to 4 As shown, the pole assembly includes a pole body 2 and an adapter block 6 , and the adapter block 6 is used to cooperate with the pole body 2 to install the pole body 2 on the battery cover 1 .

[0050] The side of the battery cover 1 facing the inside of the battery is the inner side of the battery cover 1, and the side of the battery cover 1 facing the outside of the battery is the outer side of the battery cover 1. The battery cover 1 is provided with a first through hole 11 that penetrates the battery cover 1; the adapter block 6 is used to be arranged on the inner side of the battery cover 1 and abut against the battery cover 1, and the adapter block 6 is provided with a second through hole 62, which is coaxially arranged relative to the first through hole 11. The pole body 2 is T-shaped, including a plate body portion 21 and a column body portion 22 connected vertically. When installing the pole body 2, the pole body 2 is placed on the outside of the battery cover 1, so that the column body portion 22 of the pole body 2 passes through the battery cover 1 through the first through hole 11 and then extends into the second through hole 62 of the adapter block 6 until the plate body portion 21 of the pole body 2 abuts against the outer surface of the battery cover 1, and then the column body portion 22 and the adapter block 6 are seam-welded along the circumference of the second through hole 62, thereby completing the installation of the pole body 2 on the battery cover 1.

[0051] Compared with the existing installation method of riveting the pole body 2 with the rivet block before welding, under the premise of ensuring the structural strength, the pre-riveting process is omitted in the present application, which simplifies the installation process, and because the pre-riveting process is omitted, the pole body 2 and the adapter block 6 do not need to be processed with mutually matching riveted structures, which reduces the overall processing cost. At the same time, the area where the pole body 2 and the adapter block 6 are welded in the present application is located on the inner side of the cover plate, which makes it difficult for the pole body 2 and the adapter block 6 to fall off when the cover plate is subjected to the extrusion force acting vertically on the cover plate from the outside to the inside, thereby improving the anti-extrusion ability of the pole assembly and the lithium battery as a whole, and greatly reducing the risk of mechanism failure.

[0052] In one embodiment of the present application, preferably, the pole assembly also includes a first insulating member 3, the first insulating member 3 is annular, the column portion 22 can pass through the first insulating member 3, and when the pole assembly is installed on the battery cover 1, the first insulating member 3 is located between the plate portion 21 and the battery cover 1, so that the plate portion 21 is abutted against the battery cover 1 through the first insulating member 3, so as to play an insulating role between the pole body 2 and the battery cover 1 through the first insulating member 3.

[0053] In this embodiment, preferably, Figure 1 and Figure 2 As shown, the inner edge of the first insulating member 3 is bent in a direction away from the plate body 21 to form a first flange portion, and the first flange portion is inserted between the outer wall of the column body 22 and the inner wall of the first through hole 11, so that the first insulating member 3 plays a good insulating role between the pole body 2 and the battery cover 1.

[0054] In this embodiment, preferably, Figure 1 and Figure 2 As shown, the outer edge of the first insulating member 3 is bent in a direction away from the battery cover 1 to form a second flange portion, and the second flange portion is wrapped around the outer side of the plate portion 21 of the pole assembly, thereby providing good insulation between the pole body 2 and other external components through the first insulating member 3.

[0055] In this embodiment, preferably, the material of the first insulating member 3 is PPS (polyphenylene sulfide) or LCP (liquid crystal polymer). Specifically, when the pole assembly is used as a positive pole, the material of the first insulating member 3 is preferably PPS, and when the pole assembly is used as a negative pole, the material of the first insulating member 3 is preferably LCP.

[0056] In one embodiment of the present application, preferably, the pole assembly also includes a second insulating member 4, which is arranged around the first through hole 11 on the inner side of the battery cover 1. When the pole assembly is installed on the battery cover 1, the second insulating member 4 is located between the battery cover 1 and the adapter block 6, and the adapter block 6 is abutted against the battery cover 1 through the second insulating member 4, so as to play an insulating role between the battery cover 1 and the adapter block 6 through the second insulating member 4.

[0057] Preferably, the second insulating member 4 is made of PP (polypropylene).

[0058] In one embodiment of the present application, preferably, Figure 1 and Figure 2 As shown, the pole assembly also includes a seal 5, which is annular and is arranged on the inner side of the battery cover 1 around the first through hole 11 and combined with Fig. 9 As shown, a positioning protrusion 51 is formed on the inner edge of the seal 5, and the positioning protrusion 51 is inserted into the first through hole 11; when the pole assembly is installed on the battery cover 1, the adapter block 6 can be sealed against the battery cover 1 through the seal 5, thereby sealing the pole assembly and the first through hole 11 through the seal 5 to prevent leakage of liquid inside the battery at the first through hole 11.

[0059] Preferably, the sealing member 5 is made of fluororubber.

[0060] In one embodiment of the present application, preferably, Figure 3 As shown, on the adapter block 6, a first inclined surface 61 is formed on the side wall of the second through hole 62 facing the end of the battery cover 1, so that the port of the second through hole 62 facing the end of the battery cover 1 is expanded; Figure 4 As shown, a second inclined surface 23 is formed on the outer side wall of the column portion 22 of the pole body 2. Fig. 9 As shown, the first bevel 61 is adapted to the second bevel 23. When the pole body 2 and the adapter block 6 are installed on the battery cover 1, the column portion 22 of the pole body 2 is inserted into the second through hole 62 of the adapter block 6, and the first bevel 61 is abutted against the second bevel 23. Therefore, through the cooperation of the first bevel 61 and the second bevel 23, the relative position of the assembly between the pole body 2 and the adapter block 6 can be limited.

[0061] In one embodiment of the present application, preferably, Figure 3 As shown, a sink 63 is provided on the side of the adapter block 6 facing away from the battery cover plate 1, and the second through hole 62 passes through the bottom wall of the sink 63. The end of the column portion 22 is flush with the end of the second through hole 62 and is seam welded along the circumference of the second through hole 62. By setting the sink 63, it is possible to effectively prevent the weld nodule formed at the welding point from protruding from the surface of the adapter block 6.

[0062] In this embodiment, preferably, Figure 2 and Fig. 9 As shown, the depth of the second through hole 62 of the adapter block 6 is h, 0.8mm≤h≤3mm; and / or, the penetration depth of the weld in the welding area between the column portion 22 and the adapter block 6 is d, d≥0.3mm; preferably, h and d satisfy: 0.3≤d / h≤1; further preferably, h=2mm, d=1.2mm, so as to ensure the structural strength of the connection between the pole body 2 and the adapter block 6, and also ensure that the temperature at the seal 5 during welding is below the tolerance temperature of the seal 5.

[0063] Table 1

[0064]

[0065] Table 1 shows the relationship between the depth h of the second through hole and the penetration depth d. Examples 1 to 6 show the h and d values ​​that meet the structural strength requirements, as well as the temperature at the seal 5. Comparative Examples 1 to 4 show the h and d values ​​that do not meet the structural strength requirements, as well as the temperature at the seal 5.

[0066] Specifically, a pull-out test is performed after welding the pole body and the adapter block to detect whether the structural strength after welding meets the requirements. At the same time, during welding, multiple temperature sensing lines are arranged at the position where the seal is set to detect the highest temperature at the seal position during welding.

[0067] The values ​​of d and h in Examples 1 to 6 are such that the temperature at the seal after welding the pole body and the adapter block is lower than the melting point of the fluororubber seal, thus satisfying the working temperature requirements of the fluororubber seal. At the same time, the structural strength after the pull-out test also meets the requirements. Therefore, for the parameters in Examples 1 to 6, the final conclusions are all OK, satisfying the use requirements.

[0068] In Comparative Example 1, d / h is greater than 1. After the pull-out test, the structural strength of the pole body and the adapter block after welding does not meet the requirements, and the temperature at the seal during welding is 378°C, which is higher than the melting point of the fluororubber seal, resulting in failure of the seal. Therefore, the final conclusion of Comparative Example 1 is NG, which does not meet the use requirements.

[0069] In Comparative Example 2, although the temperature of 150°C at the seal is lower than the melting point of the fluororubber seal and meets the working temperature requirements of the fluororubber seal, h is less than 0.8, d is less than 0.3, and d / h is less than 0.3. The structural strength of the pole body and the adapter block after welding does not meet the requirements after the pull-out test. Therefore, the final conclusion of Comparative Example 2 is NG, which does not meet the use requirements.

[0070] In Comparative Example 3, although the values ​​of d and h make the structural strength of the pull-out test meet the requirements, under this condition, the temperature of 437°C at the seal is higher than the melting point of the fluororubber seal, resulting in failure of the seal. Therefore, the conclusion of Comparative Example 3 is also NG, which does not meet the use requirements.

[0071] In Comparative Example 4, although the temperature of 162°C at the seal is lower than the melting point of the fluororubber seal and meets the working temperature requirement of the fluororubber seal, d / h is less than 0.3. After the pull-out test, the structural strength of the pole body and the adapter block after welding does not meet the requirements. Therefore, the conclusion of Comparative Example 4 is also NG, which does not meet the use requirements.

[0072] In this embodiment, preferably, Figure 3 and Fig.10 As shown, the depth of the sink 63 is a, 0.2mm≤a≤2mm, so as to ensure that the weld bump formed when the column part 22 is welded to the adapter block 6 will not protrude from the surface of the adapter block 6. Preferably, the distance between the side wall of the sink 63 and the side wall of the second through hole 62 is b, 0.5mm≤b≤3mm, so as to ensure that the side wall of the sink 63 can avoid the welding area.

[0073] More preferably, a=0.3 mm, b=1.2 mm.

[0074] In one embodiment of the present application, preferably, the pole body 2 is integrally stamped or pressed. Compared with the molding by machining, the processing of the pole body 2 is simpler, the material utilization rate is higher, the structure is more stable, and the cost is lower.

[0075] In this embodiment, preferably, the material of the adapter block 6 is aluminum. Figure 8 As shown in case 4, the material of the pole body 2 is aluminum, and the pole body 2 is used as a positive pole.

[0076] In this embodiment, preferably, the material of the adapter block is copper, such as Figures 5 to 7 As shown, the material of the pole body 2 is a copper-aluminum composite material, and at least the position where the column part 22 is welded to the adapter block 6 is made of copper. In this case, the pole body 2 is used as a negative pole. For example, when the pole body 2 is formed by stamping or forging the copper-aluminum composite material, Figure 5 As shown in case 1, a portion of the joint between the copper material and the aluminum material is located in the plate body 21, and a portion is located in the column body 22, so that the plate body 21 is a copper-aluminum composite material, and the column body 22 is also a copper-aluminum composite material; or Figure 6 As shown in case 2, the joint between the copper material and the aluminum material is completely located in the plate body 21, so that the plate body 21 is a copper-aluminum composite material, and the column body 22 is completely made of copper; or Figure 7As shown (case 3), the joint between the copper material and the aluminum material is completely located in the column part 22, so that the plate part 21 is completely made of aluminum material, and the column part 22 is a copper-aluminum composite material.

[0077] Table 2

[0078]

[0079] Table 2 shows the matching relationship between the pole body and the adapter block;

[0080] Case 1 represents Figure 5 The copper-aluminum composite pole body shown can cooperate with the copper transition block and be used as a negative pole, but cannot be used with the aluminum transition block;

[0081] case2 represents Figure 6 The copper-aluminum composite pole body shown can cooperate with the copper transition block and be used as a negative pole, but cannot be used with the aluminum transition block;

[0082] case3 represents Figure 7 The copper-aluminum composite pole body shown can cooperate with the copper transition block and be used as a negative pole, but cannot be used with the aluminum transition block;

[0083] Case 7 Representative Figure 8 The pole body made of aluminum shown can cooperate with the transition block made of aluminum and be used as a positive pole, but cannot be used in conjunction with the transition block made of copper.

[0084] In this embodiment, preferably, Figure 4 As shown, a transition arc is formed at the transition between the plate body 21 and the column body 22, so that it is convenient to form the pole body 2 by stamping or piercing process, and when the copper-aluminum composite material is used for forming, it can avoid the separation of copper and aluminum at the joint between the two.

[0085] Preferably, the radius of the transition arc is R, R≤2 mm, and more preferably R=0.8 mm.

[0086] The present application also provides a lithium battery, comprising a pole assembly according to any of the above embodiments.

[0087] In this embodiment, the lithium battery includes a pole assembly, so the lithium battery has all the beneficial effects of the pole assembly, which will not be described in detail here.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 invention.

Claims

1. A pole assembly, It is characterized in that It includes a pole body and a transfer block; The adapter block is used to be insulated and abutted against one side of the battery cover plate, the battery cover plate is provided with a first through hole, the adapter block is provided with a second through hole, and the first through hole is coaxial with the second through hole; The pole body comprises a plate body and a column body connected vertically, so that the pole body is T-shaped, the plate body is insulated and abutted against the other side of the battery cover, the column body passes through the first through hole and the second through hole, and the column body is welded and connected to the adapter block; The depth of the second through hole is h, 0.8 mm ≤ h ≤ 3 mm; and / or the penetration depth of the welding area between the column portion and the adapter block is d, d ≥ 0.3 mm; h and d satisfy: 0.3≤d / h≤1.

2. The pole assembly according to claim 1, It is characterized in that It also includes a first insulating member, through which the plate body abuts against the battery cover plate; The first insulating member is formed with a first flange, the first flange surrounds at least a portion of the outer side of the column portion in the circumferential direction and extends into the first through hole; The first insulating member is formed with a second flange, and the second flange surrounds at least a portion of the outer side of the plate body in the circumferential direction.

3. The pole assembly according to claim 1, It is characterized in that It also includes a second insulating member, and the adapter block abuts against the battery cover plate through the second insulating member.

4. The pole assembly according to claim 1, It is characterized in that It also includes a sealing member, which is annular and surrounds the outer side of the column portion, and the adapter block abuts against the battery cover through the sealing member; A positioning protrusion is formed on one side edge of the sealing member in the radial direction, and the positioning protrusion is inserted into the first through hole.

5. The pole assembly according to claim 1, It is characterized in that A first inclined surface is formed on a side wall of the second through hole facing the battery cover plate, so that the second through hole is expanded at one end facing the battery cover plate; A second inclined surface is formed on the side wall of the column portion, and the second inclined surface abuts against the first inclined surface.

6. The pole assembly according to claim 1, It is characterized in that A sink is formed on one side of the adapter block away from the battery cover, and the second through hole passes through the bottom wall of the sink; The depth of the sink is a, 0.2mm≤a≤2mm; And / or, the distance between the side wall of the sink and the side wall of the second through hole is b, 0.5 mm ≤ b ≤ 3 mm.

7. The pole assembly according to claim 1, It is characterized in that A transition arc is formed at the transition between the plate body and the column body; The radius of the transition arc is R, R≤2mm.

8. The pole assembly according to claim 1, It is characterized in that The pole body is formed by integral stamping or pier pressing; And / or, when the pole body is used as a negative pole, the adapter block is a copper adapter block, the pole body is a copper-aluminum composite pole, and the position where the column part and the adapter block are welded is made of copper; And / or, when the pole body is used as a positive pole, the adapter block is an aluminum adapter block, and the pole body is an aluminum pole.

9. A lithium battery, It is characterized in that The invention comprises the pole assembly according to any one of claims 1 to 8.

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