CN219350574U - Single battery and battery pack - Google Patents

Abstract

The present disclosure relates to battery manufacturing technology, and in particular, to a single battery and a battery pack. The single battery comprises a top cover and a pole terminal; the top cover is provided with a pole through hole penetrating through the top cover along the thickness direction; the post terminal includes a post body and a first connection member; the pole body is provided with a first end and a second end which are oppositely arranged along the thickness direction of the top cover, the first connecting member is connected with the first end of the pole body, and the first connecting member and the pole body are integrally formed; the pole main body is arranged in the pole through hole in a penetrating way; the first connecting member is located at one side of the top cover in the thickness direction and is used for being electrically connected with the pole terminal of the other single battery. The battery pack comprises the single battery. This battery cell and group battery, the battery cell of this application has omitted the welding step and the welded structure of utmost point post and busbar, and then has reduced part quantity, and the cost is reduced has improved the space utilization of this battery cell.

Description

Single battery and battery pack

Technical Field

The present disclosure relates to battery manufacturing technology, and in particular, to a single battery and a battery pack.

Background

The unit cell comprises a cell shell, an electrode assembly and a top cover assembly, wherein the electrode assembly is arranged in the cell shell, and the top cover assembly is covered at the opening of the cell shell. In order to lead out the positive and negative poles of the electrode assembly relative to the top cover assembly and the battery shell, the top cover assembly is provided with pole terminals in a penetrating way, the battery shell is internally provided with metal switching sheets, local areas of the metal switching sheets are welded with the pole terminals, and other local areas of the metal switching sheets are welded with positive and negative lugs of the electrode assembly, so that the positive and negative poles of the electrode assembly are led out through the positive and negative lugs, the metal switching sheets and the pole terminals in sequence.

Further, the battery pack generally includes a plurality of unit cells, and it is generally necessary to weld the post terminals on the top cap assembly of the unit cells to each other through a bus bar to realize serial-parallel connection between the unit cells in the battery pack.

In summary, the above-mentioned electric connection scheme of battery cell inside and outside not only needs to add the metal switching piece alone in the inside of battery cell, needs to weld metal switching piece respectively with utmost point ear and utmost point post terminal moreover, and outside not only needs to add the busbar in the outside of battery cell, needs to weld busbar and the utmost point post terminal of every battery cell mutually moreover.

The problems of excessive welding structures, excessive parts and complex structures existing in the current internal and external electric connection schemes of the single battery are solved, the welding yield is not easy to control, and the yield and the production efficiency are low. In addition, in order to increase the energy density of the unit cell and the battery pack, the space that can be left for the metal switching piece and the post terminal inside the unit cell is very limited.

Disclosure of Invention

An object of the present application is to provide a single battery and a battery pack, so as to solve the problem in the prior art to a certain extent that the electrical connection of a plurality of single batteries needs to add a busbar outside the single battery, and the busbar needs to be welded with the post terminal of each single battery. The external electric connection scheme of monomer battery that exists welded structure too much, spare part is too much, and the structure is complicated, and the welding yield is difficult for controlling, leads to the lower technical problem of yield and production efficiency.

The application provides a single battery, which comprises a top cover and a pole terminal;

the top cover is provided with a pole through hole penetrating through the top cover along the thickness direction of the top cover;

the post terminal includes a post body and a first connection member;

the pole body is provided with a first end and a second end which are oppositely arranged along the thickness direction of the top cover, the first connecting member is connected with the first end of the pole body, and the first connecting member and the pole body are integrally formed; the pole main body is arranged in the pole through hole in a penetrating way; the first connecting member is located at one side of the top cover in the thickness direction and is used for being electrically connected with the post terminal of the other single battery.

In the above technical solution, further, the post terminal further includes a second connection member, the second connection member is connected to the second end of the post main body, and the second connection member is located at the other side of the top cover in the thickness direction.

In any of the above technical solutions, further, the second connection member is integrally formed with the pole body.

In any of the above aspects, further, the first connecting member includes a first extension portion and a first welding portion, the first extension portion is disposed at the first end of the pole body, one end of the first welding portion in the length direction is connected to one side of the first extension portion in the length direction, or one end of the first welding portion in the width direction is connected to one side of the first extension portion in the width direction;

the first connecting member further comprises a bending portion, the bending portion is connected between the first welding portion and the first extending portion, and the first welding portion can be bent and arranged relative to the first extending portion through the bending portion.

In any of the above technical solutions, further, the unit cell further includes an electrode assembly, the electrode assembly includes a tab, and the second connection member is welded and fixed with the tab.

In any of the above technical solutions, further, the second connection member includes a second extension portion and a second welding portion, the second extension portion is disposed at the second end of the pole main body, at least one side of the second extension portion in the length direction is connected to the second welding portion, where the second welding portion is welded and fixed with the tab.

In any of the above embodiments, further, the electrode assemblies are plural, and the plural electrode assemblies are sequentially arranged along a width direction of the electrode assemblies; the second connecting member includes a plurality of second welding parts disposed at intervals in a width direction of the electrode assembly, and the second welding parts and the plurality of tabs of the electrode assembly are respectively welded and fixed in correspondence.

In any one of the above aspects, further, the second connecting member further includes a burring portion connected to a side portion of the second welding portion in the width direction.

In any of the above technical solutions, further, one end of the second connecting member in the length direction is connected to the second end of the pole body, and the other end of the second connecting member is folded in half in the width direction to form a folding groove.

In any of the above aspects, further, the first welded portion is corrugated, or the first welded portion is arched, or the first welded portion is flat.

The application also provides a battery pack, which comprises a plurality of single batteries according to any one of the technical schemes, wherein a plurality of single batteries are arranged side by side, and the first connecting members of the adjacent single batteries are welded and fixed.

Compared with the prior art, the beneficial effects of this application are:

the utility model provides a battery cell includes top cap and utmost point post terminal, the utmost point post main part wears to locate in the utmost point post through-hole of top cap, utmost point post terminal includes utmost point post main part and first connecting element, and first connecting element is connected and is located the outside of top cap with the first end of utmost point post main part to the utmost point post main part is connected with other battery cell electricity through first connecting element, in order to connect the first connecting element electricity of two battery cells, thereby realizes the electricity connection of two battery cells.

Therefore, the single battery is outside the single battery, structures such as a bus bar are not required to be additionally arranged, the welding step and the welding structure of the traditional pole column and the bus bar of the single battery are omitted, the number of parts is further reduced, the cost is reduced, the space occupied by the parts due to welding and the arrangement of the parts is saved, and the space utilization rate of the single battery is improved.

The battery pack comprises the single battery, so that all beneficial effects of the top cover assembly can be achieved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a first structure of a single battery according to an embodiment of the present disclosure;

fig. 2 is a schematic view of a first connection structure of a top cover and a post terminal of a single battery according to an embodiment of the present disclosure;

FIG. 3 is a cross-sectional view taken along section A-A of FIG. 2;

fig. 4 is a first schematic structural view of a post terminal according to an embodiment of the present disclosure;

fig. 5 is a second schematic structural view of a post terminal according to an embodiment of the present disclosure;

fig. 6 is a third schematic structural view of a post terminal according to an embodiment of the present disclosure;

fig. 7 is a fourth schematic structural view of a post terminal according to an embodiment of the present disclosure;

fig. 8 is a fifth structural schematic diagram of a post terminal according to an embodiment of the present disclosure;

fig. 9 is a sixth structural schematic diagram of a post terminal according to an embodiment of the present disclosure;

fig. 10 is a seventh structural schematic diagram of a post terminal according to an embodiment of the present disclosure;

fig. 11 is an eighth structural schematic diagram of a post terminal according to an embodiment of the present application.

Reference numerals:

1-a single battery; 10-top cover; 100-pole through holes; 11-a battery case; 12-an electrode assembly; 120-electrode lugs; 13-pole terminals; 130-a pole body; 131-a first connecting member; 1310-a first extension; 1311—a bend; 1312—a first weld; 132-a second connecting member; 1320-a second extension; 1321-second weld; 1322-folding groove; 1323-a burring portion; 14-insulating member.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Example 1

Referring to fig. 1 to 11, an embodiment of the present application provides a unit cell 1 including a top cap 10 and a post terminal 13; the top cover 10 is provided with a pole through hole 100 penetrating through the top cover 10 along the thickness direction thereof; the post terminal 13 includes a post body 130 and a first connection member 131; the pole body 130 has a first end and a second end which are oppositely disposed in the thickness direction of the top cover 10, the first connecting member 131 is connected with the first end of the pole body 130, and the first connecting member 131 is integrally formed with the pole body 130; the pole body 130 is arranged in the pole through hole 100 in a penetrating way; the first connection member 131 is located at one side of the top cover 10 in the thickness direction, and the first connection member 131 is used to electrically connect with the post terminal 13 of another unit cell.

In this embodiment, the unit battery 1 includes a battery case 11 and an electrode assembly, as shown in fig. 1, the electrode assembly is disposed in the battery case 11, and a top cap 10 is sealed at an opening of the battery case 11. The top cover 10 of the unit cell 1 is provided with an inner side and an outer side on both sides in the thickness direction thereof, respectively, wherein the inner side of the top cover 10 is configured to face the inside of the battery case 11, and the outer side of the top cover 10 is configured to face the outside of the battery case 11.

As shown in fig. 2 and 3, a post through hole 100 is opened in the top cover 10 and communicates with the inside and the outside of the top cover 10, and a post main body 130 is inserted into the post through hole 100 to fix the post terminal 13 to the top cover 10. The first and second ends of the pole body 130 are located at both sides of the top cover 10, respectively, specifically, the first end of the pole body 130 is located at the outside of the top cover 10, and the second end of the pole body 130 is located at the inside of the top cover 10.

The first connecting member 131 of the pole terminal 13 can be freely bent or folded, wherein the material of the pole terminal 13 is a conductive material, that is, the material of the pole main body 130 and the material of the first connecting member 131 are both conductive materials.

The first connection member 131 is connected with the first end of the pole body 130, the first connection member 131 and the pole body 130 are integrally formed, specifically, the first connection member 131 of the pole terminal 13 is located at the outer side of the top cover 10, so that the first end of the pole body 130 is electrically connected with the pole terminals 13 of other unit batteries 1 through the first connection member 131 capable of being freely bent or folded.

When the two unit batteries 1 are electrically connected, only the first connection members 131 of the post terminals 13 of the two unit batteries 1 are abutted and then seam welded, or the penetration welding is performed after the overlap joint is overlapped, so that the first connection members 131 of the two unit batteries 1 are welded to achieve the electrical connection.

The unit cells 1 are configured to include a pole body 130 and a first connection member 131 connected to a first end of the pole body 130 by configuring the pole terminal 13 such that two unit cells 1 can be directly electrically connected through the first connection member 131 of the pole body 130. Compared with the scheme of welding the bus bar and the pole at the outside of the single battery 1 in the prior art, the scheme of welding the first connecting member 131 of the single battery 1 omits the bus bar structure and does not need to weld the bus bar and the pole, simplifies the welding structure and the process at the outside of the single battery 1, reduces the space occupied by the welding structure, and avoids the risks of poor welding such as false welding and false welding caused by welding, thereby improving the yield and the production efficiency of the connecting structure between the single battery 1 and the single battery 1.

Further, since the first connection member 131 can be freely bent or folded, when the pole terminal 13 is assembled to the pole through hole 100 on the top cover 10 by bending or folding the first connection member 131 to pass through the pole through hole 100, the pole body 130 is fixed in the pole through hole 100, and the first connection member 131 is located at the outer side of the top cover 10.

In an alternative of the present embodiment, the post terminal 13 further includes a second connection member 132, the second connection member 132 is connected to the second end of the post body 130, and the second connection member 132 is located at the other side of the top cover 10 in the thickness direction.

In this solution, the second connection member 132 of the pole terminal 13 can be freely bent or folded, wherein the material of the pole terminal 13 is a conductive material, that is, the material of the pole main body 130, the material of the first connection member 131, and the material of the second connection member 132 are all conductive materials.

The second connection member 132 of the post terminal 13 is connected with the second end of the post body 130 so that the post terminal 13 is integrally connected with the post body 130 in advance. So that the second connection member 132 of the post terminal 13 is positioned at the inner side of the top cap 10, and the second end of the post body 130 is electrically connected to the electrode assembly inside the unit cell 1 through the second connection member 132, which can be freely bent or folded.

For each unit cell 1, when the post terminal 13 is electrically connected to the electrode assembly inside the unit cell 1, it is only necessary to seam-weld or penetration-weld after butt-welding the second connection member 132 of the post terminal 13 with the tab position of the electrode assembly, thereby welding the second connection member 132 with the electrode assembly to achieve the electrical connection.

The unit cell 1 is configured to include the post terminal 13 and the second connection member 132 connected to the second end of the post body 130, and thus, the second connection member 132 of the post body 130 can be directly electrically connected to the electrode assembly inside the unit cell 1. Compared with the scheme of welding the metal switching sheet and the pole column in the single battery 1 in the prior art, the scheme of welding the single battery 1 with the pole lug of the electrode assembly through the second connecting member 132 omits the metal switching sheet structure and does not need to weld the metal switching sheet and the pole column, simplifies the welding structure and the process in the inner side of the single battery 1, reduces the space occupied by the welding structure, avoids the risks of poor welding such as false welding and false welding caused by welding, and accordingly improves the yield and the production efficiency of the internal connection structure of the single battery 1.

Further, since the second connection member 132 can be freely bent or folded, when the post terminal 13 is assembled to the post through hole 100 on the top cover 10 by bending or folding the second connection member 132 to pass through the post through hole 100, the post main body 130 is fixed in the post through hole 100, and the second connection member 132 is located at the inner side of the top cover 10.

In an alternative to this embodiment, the second connection member 132 is integrally formed with the post body 130.

In this solution, the second connection member 132 is integrally formed with the second end of the pole body 130, and both the first connection member 131 and the second connection member 132 are integrally formed with the pole body 130. Wherein, the integral molding means that the two are directly molded into a whole, and no additional connecting methods such as welding or riveting are needed to connect the two.

According to the single battery 1, the first connecting member 131 of the pole terminal 13 is configured to be integrally formed with the pole main body 130, or the first connecting member 131 and the second connecting member 132 are configured to be integrally formed with the pole main body 130, so that the connection reliability of the first connecting member 131 and the second connecting member 132 with the pole terminal 13 is improved, the forming process of the pole terminal 13 is simplified, and the yield and the production efficiency of the pole terminal 13 are improved.

It can be appreciated that, compared to the case where only the first connection member 131 is integrally formed with the pole, the case where both the first connection member 131 and the second connection member 132 are integrally formed with the pole can simplify the welding structure and save the welding space both inside and outside the unit battery 1.

In this embodiment, in order to realize the integral molding of the first and second connection members 131 and 132 and the pole body 130, at least one of the first and second connection members 131 and 132 is integrally molded or integrally machined with the pole body 130.

In an alternative of the present embodiment, the first connection member 131 includes a first extension portion 1310 and a first welding portion 1312, the first extension portion 1310 is disposed at a first end of the pole body 130, one end of the first welding portion 1312 in the length direction is connected to one side of the first extension portion 1310 in the length direction, or one end of the first welding portion 1312 in the width direction is connected to one side of the first extension portion 1310 in the width direction; the first connecting member 131 further includes a bending portion 1311, the bending portion 1311 is connected between the first welding portion 1312 and the first extension portion 1310, and the first welding portion 1312 is provided to be bendable with respect to the first extension portion 1310 by the bending portion 1311.

In this solution, the first connection member 131 includes a first extension portion 1310 and a first welding portion 1312, where the first extension portion 1310 is disposed at a first end of the pole body 130, and the first extension portion 1310 and the first welding portion 1312 have a certain length and a certain width.

When one end of the first welding portion 1312 in the longitudinal direction is connected to one side of the first extension portion 1310 in the longitudinal direction, the position of the first welding portion 1312 of the unit cell 1 can be adjusted in the longitudinal direction of the first extension portion 1310 by adjusting the length of the first extension portion 1310 so that the position of the first welding portion 1312 of the unit cell 1 in the longitudinal direction matches the position of the first welding portion 1312 of the other unit cell 1.

When one end in the width direction of the first welded portion 1312 is connected to one side in the width direction of the first welded portion 1312, the position of the first welded portion 1312 of the single battery 1 can be adjusted in the width direction of the first extended portion 1310 by adjusting the width of the first extended portion 1310 so that the position of the first welded portion 1312 of the single battery 1 in the width direction matches the position of the first welded portion 1312 of the other single battery 1.

Thus, by configuring the first connection member 131 to include the first extension portion 1310 and the first welding portion 1312, the position of the first welding portion 1312 can be adjusted by the first extension portion 1310 so as to perform the alignment welding of the first welding portions 1312 of the two unit batteries 1, thereby achieving the electrical connection of the two unit batteries 1.

The width of the first welding portion 1312 is adjusted to adapt to different overcurrent requirements.

In addition, the first connecting member 131 further includes a bending portion 1311 connected between the first welding portion 1312 and the first extension portion 1310, where the bending portion 1311 deforms when the unit batteries 1 are stressed, so as to avoid pulling the first welding portion 1312, and further avoid pulling or damaging the welding point at the first welding portion 1312, so as to ensure that reliable welding can be maintained between the first welding portions 1312 of the two unit batteries 1.

In an alternative of the present embodiment, the unit cell 1 further includes an electrode assembly 12, the electrode assembly 12 includes a tab 120, and the second connection member 132 is welded to the tab 120.

In this technical solution, the unit battery 1 includes the electrode assembly 12, the electrode assembly 12 may be, for example, a lamination or a winding core, and the tab 120 extends from an end of the electrode assembly 12, so that the second connection member 132 is welded and fixed with the tab 120, and the electrode post terminal 13 and the electrode assembly 12 can form an electrical connection relationship, so that the electrode assemblies 12 of the two unit batteries 1 are sequentially conducted through the second connection member 132, the electrode post main body 130 and the first connection member 131 welded with each other.

Optionally, two post terminals 13 are provided on the top cover of each unit cell 1, and the two post terminals 13 are respectively a positive post terminal and a negative post terminal, where each electrode assembly 12 includes a positive post and a negative post, the second connection member 132 of the positive post terminal is electrically connected with the positive post of the electrode assembly 12, and the second connection member 132 of the negative post terminal is electrically connected with the negative post of the electrode assembly 12.

In order to prevent the positive and negative electrode terminals from being electrically connected to each other through the metal top cover 10 to cause a short circuit, an insulating material 14 is provided between at least one of the positive and negative electrode terminals and the top cover 10.

In an alternative of the present embodiment, the second connection member 132 includes a second extension portion 1320 and a second welding portion 1321, the second extension portion 1320 is disposed at the second end of the pole body 130, and at least one side of the second extension portion 1320 in the length direction is connected to the second welding portion 1321, wherein the second welding portion 1321 is welded and fixed to the tab 120.

In this embodiment, as shown in fig. 4 to 9, the second connection member 132 includes a second extension portion 1320 and a second welding portion 1321, the second extension portion 1320 is disposed at the second end of the pole body 130, and the second extension portion 1320 and the second welding portion 1321 each have a certain degree and a certain width.

As shown in fig. 4 to 6, the second welding portion 1321 is connected to both sides of the second extension portion 1320 in the longitudinal direction, or as shown in fig. 7 to 9, the second welding portion 1321 is connected to one side of the second extension portion 1320 in the longitudinal direction (the boundary between the second extension portion 1320 and the second welding portion 1321 is substantially shown by a broken line in fig. 8), so that the second welding portion 1321 is electrically connected to the second end of the pole body 130 through the second extension portion 1320.

The second extension 1320 may be connected to any position in the longitudinal direction of the second welded portion 1321, for example, the second extension 1320 may be connected to an end or a middle of the second welded portion 1321 in the longitudinal direction. As shown in fig. 4 and 8, the end portion in the longitudinal direction of the second welded portion 1321 is connected to the second extended portion 1320, and as shown in fig. 5 and 6, the middle portion in the longitudinal direction of the second welded portion 1321 is connected to the second extended portion 1320.

By adjusting the length of the second extension portion 1320, the position of the second welding portion 1321 in the length direction of the second extension portion 1320 can be adjusted, so that the position of the second welding portion 1321 of the unit battery 1 in the length direction matches with the position of the tab 120, so as to align and weld and fix the second welding portion 1321 and the tab 120.

In addition, the width of the second welding portion 1321 is adjusted to adapt to different overcurrent requirements. Specifically, if the current conducted between the tab 120 and the post terminal 13 is large, a wider second welding portion 1321 as shown in fig. 4 to 6 may be employed; if the current conducted between the tab 120 and the post terminal 13 is small, a narrower second weld 1321 as shown in fig. 7 to 9 may be employed.

In an alternative of the present embodiment, the electrode assemblies 12 are plural, and the plural electrode assemblies 12 are sequentially arranged in the width direction of the electrode assemblies 12; the second connection member 132 includes second welding portions 1321 provided at a plurality of intervals in the width direction of the electrode assembly 12, and the second welding portions 1321 are welded and fixed to the tabs 120 of the plurality of electrode assemblies 12, respectively.

In this embodiment, the number of the second welding parts 1321 is plural, that is, not less than two. Since the plurality of electrode assemblies 12 of the unit cell 1 are sequentially arranged along the width direction of the electrode assemblies 12 and the plurality of second welding parts 1321 are arranged at intervals along the width direction of the electrode assemblies 12, the arrangement direction of the plurality of second welding parts 1321 is identical to the arrangement direction of the plurality of electrode assemblies 12, so that the plurality of second welding parts 1321 can be respectively used for welding with the tabs 120 of the plurality of electrode assemblies 12 in the unit cell 1, and further, the post terminals 13 are electrically connected with the plurality of electrode assemblies 12. Specifically, after the multi-layered tab 120 of the electrode assembly 12 is fixed, it is pressed against the second welding portion 1321 and then welded, so that the welding yield is improved.

Alternatively, as shown in fig. 4 to 6, a plurality of second welding parts 1321 are commonly connected with the second end of the post body 130 through one second extension part 1320; alternatively, as shown in fig. 7 to 9, each of the second welding parts 1321 is connected to the second end of the post body 130 through one second extension part 1320, respectively.

In an alternative of the present embodiment, the second connecting member 132 further includes a burring portion 1323, and the burring portion 1323 is connected to a widthwise edge portion of the second welding portion 1321.

In this embodiment, in order to increase the contact area between the second welding portion 1321 and the tab 120, the second connection member 132 further includes a flange portion 1323, and the flange portion 1323 is connected to a side portion of the second welding portion 1321 in the width direction, so that an end surface of the tab 120 facing the top cover 10 is attached to and welded to the second welding portion 1321, and the flange portion 1323 is attached to and welded to one side of the tab 120 in the width direction of the electrode assembly 12. Further, the second connection member 132 can be welded to the tab 120 by cladding the flange portion 1323 and the second welding portion 1321, thereby increasing the welding area and improving the welding stability between the second connection member 132 and the tab 120.

Alternatively, a burring part 1323 is connected to one side portion of the second welding part 1321 in the width direction, or burring parts 1323 are connected to both side portions of the second welding part 1321 in the width direction.

In an alternative of the present embodiment, one end of the second connection member 132 in the length direction is connected to the second end of the pole body 130, and the other end of the second connection member 132 is folded in half in the width direction to form a fold 1322.

In this technical scheme, when the number of layers of tab 120 is greater, can peg graft multilayer tab 120 in the roll over groove 1322 that second connecting member 132 formed to in the tip that second connecting member 132 formed roll over groove 1322 was surmounted with multilayer tab 120, carry out penetration welding to the junction of multilayer tab 120 and second connecting member 132 again, make second connecting member 132 can more reliably weld and form the electric connection with multilayer tab 120.

In an alternative of the present embodiment, the first welding portion 1312 has a corrugated plate shape, or the first welding portion 1312 has an arched plate shape, or the first welding portion 1312 has a flat plate shape.

In this technical solution, in the first aspect, the first welding portion 1312 may be in a flat plate shape, so that the flat plate-shaped first welding portions 1312 of the two unit batteries 1 are welded, wherein edges of the flat plate-shaped first welding portions 1312 of the two unit batteries may be butted and then seam welded, or the flat plate-shaped first welding portions 1312 of the two unit batteries may be overlapped and then welded, and both the two connection structures may be capable of electrically connecting the two unit batteries 1.

As shown in fig. 5 and 6, and fig. 8 and 9, the flat plate-shaped first welding portion 1312 may extend straight with respect to the first extension portion 1310. Alternatively, as shown in fig. 4, the first welding portion 1312 may be bent and extended with respect to the first extension portion 1310 in a direction away from the second connection member 132.

As shown in fig. 4 to 6 and fig. 8 and 9, for the flat plate-shaped first welding portion 1312, a bent portion 1311 is additionally formed between the first extension portion 1310 and the second welding portion 1321 for cushioning by deformation when the unit cell 1 is subjected to stress.

In the second aspect, as shown in fig. 7, the first welding portion 1312 may be in a corrugated plate shape, and the corrugated plate-shaped first welding portion 1312 may be pulled or turned more freely, so that errors can be effectively absorbed in the process of butt joint or overlap joint of the first welding portions 1312 of adjacent unit batteries 1, the position fault tolerance is improved, and further, the two are convenient to realize high-precision welding.

In the third aspect, as shown in fig. 10 and 11, the first welding portion 1312 may be in an arched plate shape, and the arched plate-shaped first welding portion 1312 may be freely pulled or turned, so that errors can be effectively absorbed in the process of butt joint or overlap joint of the first welding portions 1312 of adjacent unit batteries 1, the position fault tolerance is improved, and high-precision welding of the two is facilitated.

Further, the number of the first welding portions 1312 in the shape of an arch plate may be two, and the two first welding portions 1312 in the shape of an arch plate are located at two sides of the first end of the pole body, which is beneficial to increasing the connection area between the first welding portions 1312 of the two unit batteries 1, thereby improving the overcurrent capability.

As shown in fig. 7, 10 and 11, since the first welding portion 1312 has an arched plate shape or a corrugated plate shape, the edge portions of the first welding portion 1312 connected to the first extension portion 1310 are each bent, and therefore the edge portions of the first welding portion 1312 connected to the first extension portion 1310 form the bent portion 1311, the bent portion 1311 integrated with the first welding portion 1312 can also achieve a cushioning effect by deformation, and thus, an additional molding of the bent portion 1311 is not required.

In an alternative of the present embodiment, in order to ensure that the first connection member 131 and the second connection member 132 can be freely bent or folded and can be electrically conductive, the materials of the post body 130, the first connection member 131 and the second connection member 132 are copper, aluminum, copper-aluminum composite, nickel, stainless steel or nickel-plated copper, that is, the materials of the post body 130, the first connection member 131 and the second connection member 132 can be any one of copper, aluminum, copper-aluminum composite, nickel, stainless steel and nickel-plated copper.

It is to be noted that the copper-aluminum composite material refers to a novel material which is formed by laminating copper plates and aluminum plates together in a cold rolling, hot rolling, explosion compounding, explosion rolling method and the like and cannot be separated.

Example two

The second embodiment provides a battery pack, the embodiment includes the single battery 1 in the first embodiment, and the technical features of the single battery 1 disclosed in the first embodiment are also applicable to the embodiment, and the technical features of the single battery 1 disclosed in the first embodiment are not repeated.

As shown in fig. 1 to 11, the battery pack provided in this embodiment includes a plurality of the unit cells 1, the plurality of unit cells 1 are arranged side by side, and the first connection members 131 of the adjacent unit cells 1 are welded.

In this solution, the first connection members 131 of the adjacent unit cells 1 are welded, so that the plurality of unit cells 1 are sequentially electrically connected and form a battery pack. The welding structure and the welding process between every two adjacent single batteries 1 are effectively simplified, the number of parts is reduced, the cost is reduced, the space occupied by the parts due to welding and additionally arranged is saved, and the reliability and the space utilization rate of the single batteries 1 can be effectively improved.

The battery pack in this embodiment has the advantages of the unit cells in the first embodiment, and the advantages of the unit cells disclosed in the first embodiment are not repeated here.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model. Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the utility model and form different embodiments. For example, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Claims (11)

1. A single battery (1) characterized by comprising a top cover (10) and a pole terminal (13);

the top cover (10) is provided with a pole through hole (100) penetrating through the top cover (10) along the thickness direction;

the pole terminal (13) comprises a pole body (130) and a first connection member (131);

the pole body (130) is provided with a first end and a second end which are oppositely arranged along the thickness direction of the top cover (10), the first connecting member (131) is connected with the first end of the pole body (130), and the first connecting member (131) and the pole body (130) are integrally formed; the pole body (130) is arranged in the pole through hole (100) in a penetrating way; the first connecting member (131) is located at one side of the top cover (10) in the thickness direction, and the first connecting member (131) is used for being electrically connected with a post terminal (13) of another single battery.

2. The unit cell (1) according to claim 1, wherein said post terminal (13) further comprises a second connection member (132), said second connection member (132) being connected to a second end of said post main body (130), said second connection member (132) being located on the other side in the thickness direction of said top cover (10).

3. The unit cell (1) according to claim 2, characterized in that the second connection member (132) is integrally formed with the post body (130).

4. The unit cell (1) according to claim 1, wherein the first connection member (131) includes a first extension portion (1310) and a first welding portion (1312), the first extension portion (1310) is provided at a first end of the pole body (130), one end in a length direction of the first welding portion (1312) is connected to one side in the length direction of the first extension portion (1310), or one end in a width direction of the first welding portion (1312) is connected to one side in the width direction of the first extension portion (1310);

the first connecting member (131) further comprises a bending portion (1311), the bending portion (1311) is connected between the first welding portion (1312) and the first extension portion (1310), and the first welding portion (1312) can be bent and arranged relative to the first extension portion (1310) through the bending portion (1311).

5. The unit cell (1) according to claim 2, wherein the unit cell (1) further comprises an electrode assembly (12), the electrode assembly (12) comprises a tab (120), and the second connection member (132) is welded to the tab (120).

6. The unit cell (1) according to claim 5, wherein the second connection member (132) includes a second extension portion (1320) and a second welding portion (1321), the second extension portion (1320) is provided at a second end of the pole body (130), at least one side in a length direction of the second extension portion (1320) is connected to the second welding portion (1321), and wherein the second welding portion (1321) is welded and fixed to the tab (120).

7. The unit cell (1) according to claim 6, wherein the electrode assemblies (12) are plural, and the plural electrode assemblies (12) are arranged in order in the width direction of the electrode assemblies (12); the second connection member (132) includes a plurality of second welded portions (1321) provided at intervals in the width direction of the electrode assembly (12), and the plurality of second welded portions (1321) are welded to the plurality of tabs (120) of the electrode assembly (12) in correspondence with each other.

8. The unit cell (1) according to claim 6, wherein the second connecting member (132) further includes a burring (1323), the burring (1323) being connected to a widthwise edge of the second welding portion (1321).

9. The unit cell (1) according to claim 2, wherein one end of the second connection member (132) in the length direction is connected to the second end of the pole body (130), and the other end of the second connection member (132) is folded in half in the width direction to form a folded groove (1322).

10. The unit cell (1) according to claim 4, wherein the first welded portion (1312) is corrugated-plate-shaped, or the first welded portion (1312) is arch-shaped, or the first welded portion (1312) is flat-plate-shaped.

11. A battery pack, characterized by comprising a plurality of the unit cells (1) according to any one of claims 1 to 10, a plurality of the unit cells (1) being arranged side by side, first connection members (131) of adjacent unit cells (1) being welded and fixed.

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