Battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery and a battery pack, comprising: a housing provided with a pole hole; the pole column body is connected with the shell and penetrates through the pole column hole, a bearing section is formed at the inner end of the pole column body, at least part of the bearing section is arranged opposite to the inner side face of the shell, and the face, away from the shell, of the bearing section protrudes to form a protruding part; the conductive part is provided with a mounting hole, at least the protruding part is inserted into the mounting hole, the peripheral wall of the protruding part abuts against and is welded to the hole wall of the mounting hole to form a butt welding mark, and the conductive part abuts against and is welded to the face, away from the shell, of the bearing section to form a penetrating welding mark. According to the utility model, the protruding part of the pole body is matched with the mounting hole of the conductive piece in a plugging manner, and the pole body and the conductive piece are welded through the butt welding mark and the penetrating welding mark, so that the connection strength of the pole body and the conductive piece is ensured, the overcurrent capacity between the pole body and the conductive piece is improved, and the overcurrent requirement of the battery is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to battery and battery package. BACKGROUND

[0002] The battery is usually connected with the pole group through the pole post, and is connected with the busbar and other conductive components through the pole post, so as to lead out the current of the pole group. In order to ensure the overcurrent capacity between the pole post and the pole group, the pole post needs to have sufficient area for welding with the tab of the pole group, so as to form a welding mark with sufficient effective area, so as to form sufficient flow area. However, in the prior art, the volume of the pole post itself is small, and the area available for welding with the tab is also small. Therefore, it is usually necessary to connect another pole post structure or connecting piece to the pole post to increase the welding area, and the connection strength and overcurrent capacity of the pole post itself and the other pole post structure or connecting piece also need to be satisfied. SUMMARY

[0003] Therefore, the utility model provides a kind of battery and battery package to solve the problem that the connection strength and overcurrent capacity of the pole post itself and the other pole post structure or connecting piece in the prior art cannot be satisfied.

[0004] In a first aspect, the utility model provides a kind of battery, comprising: shell, is equipped with pole post hole;Pole post body is connected with the shell and is set through the pole post hole, the inner end of the pole post body forms support section, at least part of the support section is opposite with the inner side of the shell, and the side of the support section away from the shell is protruded to form protruding part;Conductive piece, is equipped with mounting hole, at least the protruding part is inserted into the mounting hole, the peripheral wall of the protruding part is abutted with the hole wall of the mounting hole and is welded to form butt joint welding mark, and the conductive piece is abutted with the side of the support section away from the shell and is welded to form through welding mark.

[0005] Beneficial effect: the protruding part of the pole post body and the mounting hole of the conductive piece are inserted and matched, and the pole post body and the conductive piece are welded through butt joint welding mark and through welding mark, so as to ensure the connection strength of the pole post body and the conductive piece, improve the overcurrent capacity between the pole post body and the conductive piece, and meet the overcurrent demand of battery.

[0006] In an alternative embodiment, the mounting hole includes a first hole section and a second hole section connected, the opening area of the first hole section is greater than the opening area of the second hole section, to form a step structure at the connection position of the first hole section and the second hole section, the support section is arranged in the first hole section, the side of the support section away from the shell is abutted with the step surface of the step structure, and the protruding part is arranged in the second hole section, and the peripheral wall of the protruding part is abutted with the hole wall of the second hole section.

[0007] In an alternative embodiment, the thickness of the supporting section is a, satisfying a≥0.5mm; the thickness of the conductive part corresponding to the second hole section is b, satisfying b≥0.3mm; and the total thickness of the conductive part is c, satisfying c≥1.5mm.

[0008] Beneficial effects: By limiting the thickness of the supporting section, the structural strength of the supporting section is ensured, thereby ensuring the installation stability of the pole body on the shell; by limiting the thickness of the conductive part corresponding to the second hole section, the strength of the conductive part itself and the welding strength of the conductive part and the supporting section are ensured; by limiting the total thickness of the conductive part, the conductive part has sufficient thickness to open the first hole section and the second hole section, thereby ensuring the matching of the supporting section and the first hole section and the matching of the protruding part and the second hole section.

[0009] In an alternative embodiment, the fusion width of the butt welding mark is w1, satisfying w1≥0.5mm; and the fusion depth of the butt welding mark is h1, satisfying h1≥0.3mm.

[0010] Beneficial effects: By limiting the fusion width and the fusion depth of the butt welding, the welding strength of the butt welding mark is ensured.

[0011] In an alternative embodiment, the fusion width of the penetration welding mark is w2, satisfying w2≥0.3mm; and the fusion depth of the penetration welding mark is h2, satisfying 0.3mm≤h2≤1.0mm.

[0012] Beneficial effects: By limiting the fusion width and the fusion depth of the penetration welding mark, the welding strength of the penetration welding mark is ensured, and the penetration welding mark is prevented from welding through the supporting section to affect the sealing performance of the battery.

[0013] In an alternative embodiment, one side of the protruding part away from the supporting section and one side of the conductive part away from the supporting section are provided with a patch, and the patch covers at least the butt welding mark and the penetration welding mark.

[0014] Beneficial effects: The patch is used to cover the butt welding mark and the penetration welding mark, thereby preventing the welding slag generated by welding from falling into the battery to cause safety problems.

[0015] In an alternative embodiment, the thickness of the patch is d, satisfying 0.1mm≤d≤0.3mm.

[0016] Beneficial effects: By limiting the thickness of the patch, the covering effect of the butt welding mark and the penetration welding mark is ensured, and the internal space of the battery is prevented from being occupied too much to affect the arrangement of other components in the battery.

[0017] In one optional embodiment, the electrode body further includes a base section and a connecting section, the base section being connected to the side of the support section near the outer casing, the connecting section being connected to the side of the base section away from the support section, and the connecting section extending out of the outer surface of the outer casing; the battery further includes a connecting block, the connecting block being connected to the peripheral wall of the connecting section and being disposed opposite to the outer surface of the outer casing.

[0018] Beneficial effect: By using the connecting block and the supporting section of the pole body to limit the movement on both the inner and outer sides of the outer shell, the pole body is fixed to the outer shell.

[0019] In one alternative embodiment, the battery further includes an upper insulating member located between the connecting block and the outer side of the housing; and / or, the battery further includes a lower insulating member fitted against the inner side of the housing, with at least a portion of the lower insulating member extending between the inner side of the housing and the support section; and / or, the battery further includes a sealing member surrounding the base section and compressed between the connecting block and the support section.

[0020] Secondly, this utility model also provides a battery pack, including the aforementioned battery. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a battery cover according to an embodiment of the present utility model;

[0023] Figure 2 for Figure 1 A top view of the battery cover shown;

[0024] Figure 3 for Figure 2 Partial sectional view along the AA direction;

[0025] Figure 4 for Figure 3 A magnified view of a portion of point C in the middle;

[0026] Figure 5 for Figure 2 A cross-sectional view along the BB direction.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1, shell; 2, pole body; 201, bearing section; 202, protruding part; 203, base section; 204, connecting section; 3, conductive part; 301, mounting hole; 3011, first hole section; 3012, second hole section; 4, butt weld; 5, penetration weld; 6, patch; 7, connecting block; 8, upper insulating part; 9, lower insulating part; 10, sealing part. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the drawings of the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] The following will be combined with Figures 1 to 5 to describe the embodiments of the present application.

[0031] According to the embodiments of the present application, on one hand, a battery is provided, which comprises a shell 1, a pole body 2 and a conductive part 3. The shell 1 is provided with a pole hole, the pole body 2 is connected with the shell 1 and is arranged through the pole hole, the inner end of the pole body 2 forms a bearing section 201, and at least part of the bearing section 201 is arranged opposite to the inner side surface of the shell 1. The side of the bearing section 201 away from the shell 1 protrudes to form a protruding part 202, the conductive part 3 is provided with a mounting hole 301, and at least the protruding part 202 is inserted into the mounting hole 301. The peripheral wall of the protruding part 202 abuts against and is welded with the hole wall of the mounting hole 301 to form a butt weld 4, and the conductive part 3 abuts against and is welded with the side of the bearing section 201 away from the shell 1 to form a penetration weld 5.

[0032] The protruding part 202 of the pole body 2 and the mounting hole 301 of the conductive part 3 are inserted and matched, and the pole body 2 and the conductive part 3 are welded through the butt weld 4 and the penetration weld 5, so as to ensure the connection strength of the pole body 2 and the conductive part 3, improve the overcurrent capacity between the pole body 2 and the conductive part 3, and meet the overcurrent demand of the battery.

[0033] It is worth mentioning that, please refer to Figure 4 laser seam welding is performed at the joint between the peripheral wall of the protruding part 202 and the hole wall of the mounting hole 301, so as to form the butt weld 4; and penetration welding is performed at the abutting surface between the conductive part 3 and the bearing section 201, so as to form the penetration weld 5.

[0034] It should be noted that the shell 1 includes a shell and a cover plate body, at least one end of the shell has an opening, the cover plate body is connected with the shell and blocks the opening, and the shell and the cover plate body enclose to form an accommodation space. The pole column hole can be arranged on the shell, or arranged on the cover plate body. Of course, the pole column hole can also be arranged on both the shell and the cover plate body. Specifically, in the embodiment, as shown in Figure 1 The pole column hole is arranged on the cover plate body, and the cover plate body, the pole column body 2 and other components on the cover plate body combine to form a battery cover plate. Therefore, the inner end of the pole column body 2 is the end of the pole column body 2 close to the accommodation space, and the inner side of the shell 1 is the side of the shell 1 close to the accommodation space. Correspondingly, the outer side of the shell 1 is the side of the shell 1 away from the accommodation space.

[0035] In one embodiment, as shown in Figure 3 The mounting hole 301 includes a first hole section 3011 and a second hole section 3012 arranged in communication, the opening area of the first hole section 3011 is larger than that of the second hole section 3012, so as to form a stepped structure at the communication position of the first hole section 3011 and the second hole section 3012, the supporting section 201 is arranged in the first hole section 3011, and the side of the supporting section away from the shell 1 abuts against the stepped surface of the stepped structure. The protruding part 202 is arranged in the second hole section 3012, and the peripheral wall of the protruding part 202 abuts against the hole wall of the second hole section 3012.

[0036] It should be noted that in the embodiment, the supporting section 201 and the protruding part 202 are coaxially arranged in cylindrical structures, and correspondingly, the first hole section 3011 and the second hole section 3012 are coaxially arranged in cylindrical hole structures, and the diameter of the first hole section 3011 is larger than that of the second hole section 3012.

[0037] In one embodiment, as shown in Figure 4 The thickness of the supporting section 201 is a, and a≥0.5mm is satisfied. By limiting the thickness of the supporting section 201, the structural strength of the supporting section 201 is ensured, so as to ensure the stability of the installation of the pole column body 2 on the shell 1. That is, if the thickness of the supporting section 201 is too small, the supporting section 201 is too thin, and the structural strength of the supporting section 201 is weak, so that the stability of the supporting section 201 in the inner side of the shell 1 cannot be ensured, and the stability of the installation of the pole column body 2 cannot be ensured. Moreover, if the thickness of the supporting section 201 is too small, it is difficult to accommodate the penetration of the penetration welding mark 5, that is, the supporting section 201 is easily penetrated by the penetration welding mark 5, and the sealing performance of the battery cannot be guaranteed.

[0038] In one embodiment, as shown in Figure 4As shown, the thickness of the conductive piece 3 corresponding to the second hole section 3012 is b, and b≥0.3mm is satisfied. By limiting the thickness of the conductive piece 3 corresponding to the second hole section 3012, the strength of the conductive piece 3 and the welding strength between the conductive piece 3 and the supporting section 201 are ensured.

[0039] In one embodiment, as shown in FIG. 4, the total thickness of the conductive piece 3 is c, and c≥1.5mm is satisfied. By limiting the total thickness of the conductive piece 3, the conductive piece 3 has sufficient thickness to open the first hole section 3011 and the second hole section 3012, and the matching of the supporting section 201 and the first hole section 3011 and the matching of the protruding section 202 and the second hole section 3012 are ensured. Figure 4

[0040] In one embodiment, as shown in FIG. 4, the total thickness of the conductive piece 3 is c, and c≥1.5mm is satisfied. By limiting the total thickness of the conductive piece 3, the conductive piece 3 has sufficient thickness to open the first hole section 3011 and the second hole section 3012, and the matching of the supporting section 201 and the first hole section 3011 and the matching of the protruding section 202 and the second hole section 3012 are ensured. Figure 4

[0041] It is worth noting that, as shown in FIG. 4, for the butt weld 4, the width of the butt weld 4 is the width of the weld formed on the side of the protruding section 202 away from the supporting section 201 and on the side of the conductive piece 3 away from the supporting section 201, and the depth of the butt weld 4 is the distance from the side of the protruding section 202 away from the supporting section 201 (i.e. the side of the conductive piece 3 away from the supporting section 201, because the side of the protruding section 202 away from the supporting section 201 is basically flush with the side of the conductive piece 3 away from the supporting section 201) to the end of the butt weld 4 inside the pole body 2. Figure 4

[0042] In one embodiment, as shown in FIG. 4, the total thickness of the conductive piece 3 is c, and c≥1.5mm is satisfied. By limiting the total thickness of the conductive piece 3, the conductive piece 3 has sufficient thickness to open the first hole section 3011 and the second hole section 3012, and the matching of the supporting section 201 and the first hole section 3011 and the matching of the protruding section 202 and the second hole section 3012 are ensured. Figure 4

[0043] It is worth noting that, as shown in FIG. 4, for the butt weld 4, the width of the butt weld 4 is the width of the weld formed on the side of the protruding section 202 away from the supporting section 201 and on the side of the conductive piece 3 away from the supporting section 201, and the depth of the butt weld 4 is the distance from the side of the protruding section 202 away from the supporting section 201 (i.e. the side of the conductive piece 3 away from the supporting section 201, because the side of the protruding section 202 away from the supporting section 201 is basically flush with the side of the conductive piece 3 away from the supporting section 201) to the end of the butt weld 4 inside the pole body 2. Figure 4

[0044] In one embodiment, as shown in FIG. 4, the total thickness of the conductive piece 3 is c, and c≥1.5mm is satisfied. By limiting the total thickness of the conductive piece 3, the conductive piece 3 has sufficient thickness to open the first hole section 3011 and the second hole section 3012, and the matching of the supporting section 201 and the first hole section 3011 and the matching of the protruding section 202 and the second hole section 3012 are ensured. Figures 3 to 5 ​​​​​As shown, the protruding part 202 and the conductive part 3 away from the supporting section 201 are provided with a patch 6, and the patch 6 covers at least the butt weld 4 and the penetration weld 5. The butt weld 4 and the penetration weld 5 are covered by the patch 6, so that the welding slag generated by welding is prevented from falling into the battery to cause safety problems.

[0045] Further, in one embodiment, as shown in Figure 4 The thickness of the patch 6 is d, and 0.1mm≤d≤0.3mm. By limiting the thickness of the patch 6, the coverage effect of the butt weld 4 and the penetration weld 5 is ensured, and the internal space of the battery is prevented from being occupied too much to affect the arrangement of other components in the battery.

[0046] In one embodiment, as shown in Figure 3 And Figure 5 The pole body 2 further includes a base section 203 and a connecting section 204, the base section 203 is connected to the side of the supporting section 201 close to the shell 1, the connecting section 204 is connected to the side of the base section 203 away from the supporting section 201, and the connecting section 204 extends out of the outer side of the shell 1; the battery further includes a connecting block 7, the connecting block 7 is connected to the peripheral wall of the connecting section 204 and is arranged opposite to the outer side of the shell 1. In this way, the connecting block 7 and the supporting section 201 of the pole body 2 are used to limit the inner and outer sides of the shell 1, so as to fix the pole body 2 to the shell 1.

[0047] In one embodiment, as shown in Figure 3 And Figure 5 The battery further includes an upper insulating part 8, and the upper insulating part 8 is located between the connecting block 7 and the outer side of the shell 1.

[0048] In one embodiment, as shown in Figure 3 And Figure 5 The battery further includes a lower insulating part 9, and the lower insulating part 9 is arranged in close contact with the inner side of the shell 1, and at least part of the lower insulating part 9 extends into the inner side of the shell 1 and the supporting section 201.

[0049] In one embodiment, as shown in Figure 3 And Figure 5 The battery further includes a sealing part 10, and the sealing part 10 is arranged around the base section 203 and is compressed between the connecting block 7 and the supporting section 201.

[0050] According to the embodiments of the utility model, on the other hand, a battery pack is also provided, which includes the above battery.

[0051] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope of the appended claims.

Claims

1. A battery, characterized in that, include: The outer casing has pole holes; The electrode body is connected to the outer shell and is disposed through the electrode hole. The inner end of the electrode body forms a support section. At least a portion of the support section is disposed opposite to the inner side of the outer shell. The side of the support section away from the outer shell protrudes to form a protrusion. The conductive component has a mounting hole, at least the protrusion is inserted into the mounting hole, the peripheral wall of the protrusion abuts against the wall of the mounting hole and is welded to form a butt weld mark, and the conductive component abuts against the side of the support section away from the outer shell and is welded to form a through weld mark.

2. The battery according to claim 1, characterized in that, The mounting hole includes a first hole segment and a second hole segment connected together. The opening area of ​​the first hole segment is larger than that of the second hole segment, so as to form a stepped structure at the connection position of the first hole segment and the second hole segment. The supporting segment is disposed in the first hole segment, and the side of the supporting segment away from the outer shell abuts against the stepped surface of the stepped structure. The protrusion is disposed in the second hole segment, and the peripheral wall of the protrusion abuts against the hole wall of the second hole segment.

3. The battery according to claim 2, characterized in that, The thickness of the supporting section is a, which satisfies a≥0.5mm; the thickness of the conductive element corresponding to the second hole section is b, which satisfies b≥0.3mm; the total thickness of the conductive element is c, which satisfies c≥1.5mm.

4. The battery according to any one of claims 1 to 3, characterized in that, The weld width of the butt weld is w1, which satisfies w1≥0.5mm; the weld depth of the butt weld is h1, which satisfies h1≥0.3mm.

5. The battery according to any one of claims 1 to 3, characterized in that, The penetration width of the solder joint is w2, which satisfies w2≥0.3mm; the penetration depth of the solder joint is h2, which satisfies 0.3mm≤h2≤1.0mm.

6. The battery according to any one of claims 1 to 3, characterized in that, The protrusion is provided with a patch on the side away from the support section and the conductive element is provided with a patch that at least covers the butt solder mark and the through solder mark.

7. The battery according to claim 6, characterized in that, The thickness of the patch is d, which satisfies 0.1mm≤d≤0.3mm.

8. The battery according to any one of claims 1 to 3, characterized in that, The electrode body further includes a base section and a connecting section. The base section is connected to the side of the support section near the outer shell, and the connecting section is connected to the side of the base section away from the support section. The connecting section extends out of the outer surface of the outer shell. The battery also includes a connecting block, which is connected to the peripheral wall of the connecting section and is disposed opposite to the outer surface of the outer shell.

9. The battery according to claim 8, characterized in that, The battery further includes an upper insulating member located between the connecting block and the outer surface of the housing; and / or, The battery further includes a lower insulating member, which is fitted against the inner side of the housing, with at least a portion of the lower insulating member extending between the inner side of the housing and the supporting section; and / or, The battery also includes a seal that surrounds the base section and is compressed between the connecting block and the supporting section.

10. A battery pack, characterized in that, The battery includes any one of claims 1 to 9.

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