CN217507419U

CN217507419U - Secondary battery and battery module

Info

Publication number: CN217507419U
Application number: CN202221584834.8U
Authority: CN
Inventors: 刘宏勇; 于哲勋
Original assignee: Jiangsu Zenergy Battery Technologies Co Ltd
Current assignee: Jiangsu Zenergy Battery Technologies Co Ltd
Priority date: 2022-06-23
Filing date: 2022-06-23
Publication date: 2022-09-27
Anticipated expiration: 2032-06-23

Abstract

The utility model discloses a secondary battery and a battery module, wherein the battery comprises a battery core and a top cover; the top cover is provided with a positive pole ear hole and a negative pole ear hole; the battery cell is provided with a positive electrode lug group formed by laminating positive electrode lugs and a negative electrode lug group formed by laminating negative electrode lugs; the positive lug group penetrates through the positive lug hole to extend outwards, and the width of the positive lug group is 0.8-0.95 times of the width of the battery cell; the negative electrode tab group penetrates through the negative electrode tab hole to extend outwards, and the width of the negative electrode tab group is 0.8-0.95 times of the width of the battery cell. The utility model discloses just, negative pole ear crowd prolongs respectively and stretches out in the top cap in order to replace just, on the basis of negative pole post, through the width design of just, negative pole ear crowd for 0.8-0.95 times of electric core width for can further reduce secondary battery's internal resistance, thereby secondary battery's temperature rise when reducing fast charge by a wide margin has not only improved secondary battery's performance and security, but also provides secondary battery's output, has higher market spreading value.

Description

Secondary battery and battery module

Technical Field

The utility model relates to a battery technology field especially relates to a secondary battery and battery module.

Background

The rechargeable battery, also called secondary battery, has the outstanding characteristics of light weight, high energy density, no pollution, no memory effect, long service life and the like, and is widely applied to the fields of mobile phones, computers, household appliances, electric tools and the like.

At present, when the secondary battery is charged quickly, the temperature rise of the secondary battery is large, the performance of the secondary battery is influenced, and the safety risk of the secondary battery in the use process is increased. For this reason, the internal resistance of the secondary battery is a key factor. Although the prior art reduces the internal resistance of the secondary battery by adopting a non-pole mode, particularly, the pole lug group formed by laminating the pole lugs is extended and extends out of the top cover to replace the pole, so that the heating of the part of the joint of the pole lug and the pole is reduced, but the temperature rise of the secondary battery is still large in practice.

Therefore, how to further reduce the temperature rise of the secondary battery during rapid charging, thereby improving the performance and safety of the secondary battery, is a technical problem to be solved in the field.

The above information is given as background information only to aid in understanding the present disclosure, and no determination or admission is made as to whether any of the above is available as prior art against the present disclosure.

SUMMERY OF THE UTILITY MODEL

The utility model provides a secondary battery and battery module to solve the not enough of prior art.

In order to achieve the above object, the present invention provides the following technical solutions:

in a first aspect, an embodiment of the present invention provides a secondary battery, where the battery includes a battery cell 1 and a top cap 2; wherein,

the top cover 2 is provided with a positive pole ear hole 3 and a negative pole ear hole 4;

the battery cell 1 is provided with a positive electrode lug group 5 formed by stacking positive electrode lugs and a negative electrode lug group 6 formed by stacking negative electrode lugs;

the positive lug group 5 penetrates through the positive lug hole 3 to extend outwards, and the width of the positive lug group 5 is 0.8-0.95 times of the width of the battery core 1;

the negative electrode ear group 6 penetrates through the negative electrode ear hole 4 to extend outwards, and the width of the negative electrode ear group 6 is 0.8-0.95 times of the width of the battery core 1.

In the secondary battery, one positive electrode tab group 5 is provided, and one negative electrode tab group 6 is provided;

the positive electrode tab group 5 and the negative electrode tab group 6 are arranged at the same end of the battery core 1;

the top cover 2 comprises an upper top cover 201;

the upper top cover 201 is provided with one positive ear hole 3 corresponding to one positive ear group 5 and one negative ear hole 4 corresponding to one negative ear group 6.

one positive electrode tab group 5 and one negative electrode tab group 6 are arranged at different ends of the battery cell 1;

the top cover 2 comprises an upper top cover 201 and a lower top cover 202;

the upper top cover 201 is provided with one positive electrode ear hole 3 corresponding to one positive electrode ear group 5, and the lower top cover 202 is provided with one negative electrode ear hole 4 corresponding to one negative electrode ear group 6;

or, the upper top cover 201 is provided with one negative electrode ear hole 4 corresponding to one negative electrode ear group 6, and the lower top cover 202 is provided with one positive electrode ear hole 3 corresponding to one positive electrode ear group 5.

In the secondary battery, two positive electrode tab groups 5 are provided, and two negative electrode tab groups 6 are provided;

the top cover 2 comprises an upper top cover 201 and a lower top cover 202;

the two positive electrode tab groups 5 are arranged at one end of the battery cell 1, and the two negative electrode tab groups 6 are arranged at the other end of the battery cell 1; the upper top cover 201 is provided with two positive electrode ear holes 3 corresponding to the two positive electrode ear groups 5, and the lower top cover 202 is provided with two negative electrode ear holes 4 corresponding to the two negative electrode ear groups 6;

or, the two positive electrode tab groups 5 are respectively arranged at two ends of the electric core 1 and located at the same side, and the two negative electrode tab groups 6 are respectively arranged at two ends of the electric core 1 and located at the same side; the upper top cover 201 is provided with one positive ear hole 3 corresponding to one positive ear group 5 and one negative ear hole 4 corresponding to one negative ear group 6, and the lower top cover 202 is provided with one positive ear hole 3 corresponding to one positive ear group 5 and one negative ear hole 4 corresponding to one negative ear group 6;

or, the two positive electrode tab groups 5 are respectively arranged at two ends of the electric core 1 and located at different sides, and the two negative electrode tab groups 6 are respectively arranged at two ends of the electric core 1 and located at different sides; the upper top cover 201 is provided with one positive ear hole 3 corresponding to one positive ear group 5 and one negative ear hole 4 corresponding to one negative ear group 6, and the lower top cover 202 is provided with one positive ear hole 3 corresponding to one positive ear group 5 and one negative ear hole 4 corresponding to one negative ear group 6.

Further, in the secondary battery, a first polymer diffusion welding region 7 is formed by polymer diffusion welding at both one end of the positive electrode tab group 5 close to the battery cell 1 and one end of the negative electrode tab group 6 close to the battery cell 1;

and one end of the positive electrode lug group 5, which is far away from the battery cell 1, and one end of the negative electrode lug group 6, which is far away from the battery cell 1, form a second polymer diffusion welding area 8 in a polymer diffusion welding mode.

In the secondary battery, a part of the first polymer diffusion welding region 7, the second polymer diffusion welding region 8, a region where the positive electrode tab group 5 is not diffusion-welded with a polymer, and a region where the negative electrode tab group 6 is not diffusion-welded with a polymer are exposed from the top cover 2;

in the part of the positive tab group 5 exposed out of the top cover 2, the area occupied by the region of the positive tab group 5 which is not subjected to macromolecular diffusion welding is 20-70%;

in the part of the negative electrode tab group 6 exposed out of the top cover 2, the area occupied by the region of the negative electrode tab group 6 not subjected to macromolecular diffusion welding is 20-70%;

the part of the first high molecular diffusion welding area 7 exposed out of the top cover 2 accounts for 2-10% of the sum of the areas of the first high molecular diffusion welding area 7 and the second high molecular diffusion welding area 8.

Further, in the secondary battery, an annular sealing groove 9 is formed around the positive electrode ear hole 3 and around the negative electrode ear hole 4;

or, the inner wall of the positive pole ear hole 3 and the inner wall of the negative pole ear hole 4 are provided with annular protrusions 10, and annular convex walls 11 are arranged around the positive pole ear hole 3 and around the negative pole ear hole 4.

Further, in the secondary battery, the depth of the annular sealing groove 9 is 0.2 to 0.4 times the thickness of the top cover 2, and the length and the width of the annular sealing groove 9 are 1.05 to 1.50 times the length and the width of the positive electrode ear hole 3 or the negative electrode ear hole 4, respectively;

the width of the positive ear hole 3 is 1-4mm larger than that of the positive ear group 5, and the length of the positive ear hole 3 is 1-4mm larger than that of the positive ear group 5;

the width of the negative electrode ear hole 4 is 1-4mm larger than that of the negative electrode ear group 6, and the length of the negative electrode ear hole 4 is 1-4mm larger than that of the negative electrode ear group 6.

Further, in the secondary battery, one positive electrode tab group 5 and one negative electrode tab group 6 located at the same end of the battery core 1 are reversely turned over and are turned over outwards, and one positive electrode tab group 5 and one negative electrode tab group 6 are arranged in a high-low mode;

or, one positive electrode tab group 5 and one negative electrode tab group 6 located at different ends of the battery core 1 are reversely turned over and are turned over outwards, and one positive electrode tab group 5 and one negative electrode tab group 6 are arranged in a high-low mode;

or the two positive electrode tab groups 5 positioned at the same end of the battery core 1 are reversely turned over and are both turned over outwards, and the two positive electrode tab groups 5 are arranged in a high-low mode; the two negative electrode tab groups 6 positioned at the same end of the battery core 1 are reversely turned over and are all turned over outwards, and the two negative electrode tab groups 6 are arranged in a high-low mode;

or the two positive tab groups 5 positioned at different ends of the battery core 1 are reversely turned over and are both turned over outwards, and the heights of the two positive tab groups 5 are the same; the two negative electrode tab groups 6 positioned at different ends of the battery core 1 are reversely turned over and are turned over outwards, and the heights of the two negative electrode tab groups 6 are the same; the height of the positive electrode tab group 5 is greater than that of the negative electrode tab group 6;

or, the two positive tab groups 5 located at different ends of the battery core 1 are folded in the same direction and are both folded outwards, and the heights of the two positive tab groups 5 are the same; the two negative electrode tab groups 6 positioned at different ends of the battery core 1 are folded in the same direction and are both folded outwards, and the heights of the two negative electrode tab groups 6 are the same; the height of the positive electrode tab group 5 is greater than that of the negative electrode tab group 6.

In a second aspect, an embodiment of the present invention provides a battery module, including at least two secondary batteries as described in the first aspect above;

at least two secondary batteries are arranged side by side, a positive electrode tab group 5 in each secondary battery is overlapped with a negative electrode tab group 6 in the other secondary battery, and the negative electrode tab group 6 in each secondary battery is overlapped with the positive electrode tab group 5 in the other secondary battery.

Compared with the prior art, the embodiment of the utility model provides a following beneficial effect has:

the embodiment of the utility model provides a pair of secondary battery and battery module, just, negative pole ear crowd prolongs respectively and stretches out in the top cap in order to replace just, on the basis of negative pole post, through with just, the width design of negative pole ear crowd is 0.8-0.95 times of electric core width, make can further reduce secondary battery's internal resistance, thereby secondary battery's temperature rise when reducing fast charge by a wide margin has not only improved secondary battery's performance and security, but also secondary battery's output has been provided, higher market spreading value has.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view illustrating a structural assembly of a secondary battery according to an embodiment of the present invention;

fig. 2 is an exploded schematic view of a secondary battery according to an embodiment of the present invention;

fig. 3 is a schematic view illustrating a structural assembly of a secondary battery according to an embodiment of the present invention;

fig. 4 is an exploded schematic view of a secondary battery according to an embodiment of the present invention;

fig. 5 is a schematic view illustrating an assembly of a secondary battery according to an embodiment of the present invention;

fig. 6 is an exploded schematic view of a secondary battery according to an embodiment of the present invention;

fig. 7 is a schematic view illustrating an assembly structure of a secondary battery according to an embodiment of the present invention;

fig. 8 is an exploded schematic view of a secondary battery according to an embodiment of the present invention;

fig. 9 is a schematic view illustrating an assembly structure of a secondary battery according to an embodiment of the present invention;

fig. 10 is an exploded schematic view of a secondary battery according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a positive electrode tab group and a negative electrode tab group according to a first embodiment of the present invention;

fig. 12 is a schematic structural diagram of a top cover according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of a top cover according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a battery module according to a second embodiment of the present invention;

fig. 15 is a schematic structural diagram of a battery module according to a second embodiment of the present invention.

Reference numerals:

the battery comprises a battery core 1, a top cover 2, a positive electrode lug hole 3, a negative electrode lug hole 4, a positive electrode lug group 5, a negative electrode lug group 6, a first high polymer diffusion welding area 7, a second high polymer diffusion welding area 8, an annular sealing groove 9, an annular bulge 10, an annular bulge wall 11 and a shell 12;

an upper top cover 201 and a lower top cover 202.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Furthermore, the terms "long", "short", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience of describing the present invention, but do not indicate or imply that the device or element referred to must have the specific orientation, operate in the specific orientation configuration, and thus, should not be construed as limiting the present invention.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Example one

In view of the above-mentioned drawbacks of the conventional internal resistance reducing technology for secondary batteries, the applicant of the present invention is based on practical experience and professional knowledge that are abundant over many years in designing and manufacturing such products, and actively performs research and innovation in cooperation with the application of theory, so as to hopefully create a technology capable of solving the drawbacks of the conventional technology, and make the internal resistance reducing technology for secondary batteries more practical. Through continuous research and design, and after repeated trial sample and improvement, the utility model discloses the practical value of utensil is established in the end.

Referring to fig. 1 to 13, an embodiment of the present invention provides a secondary battery, where the battery includes a battery cell 1 and a top cap 2; wherein,

the battery cell 1 is provided with a positive electrode tab group 5 formed by laminating positive electrode tabs and a negative electrode tab group 6 formed by laminating negative electrode tabs;

the positive lug group 5 penetrates through the positive lug hole 3 and extends outwards, the width of the positive lug group 5 is 0.8-0.95 times of the width of the battery core 1, and the length of the positive lug group 5 is 10-200 mm;

the negative electrode lug group 6 penetrates through the negative electrode lug hole 4 to extend outwards, the width of the negative electrode lug group 6 is 0.8-0.95 times of the width of the battery core 1, and the length of the positive electrode lug group 5 is 10-200 mm.

It is understood that the battery further includes the necessary components such as the case 12, the electrolyte, etc., and the specific functions of the components are to ensure the normal operation of the functions of the secondary battery, and the components are not further described herein since they are most implemented in the prior art and are not the main points of the design of the present solution.

It should be noted that, in the present embodiment, a design beneficial to reducing the internal resistance of the secondary battery is further performed on the basis of the design of the non-polar column; the design of the non-pole post mainly comprises that the positive pole ear group 5 and the negative pole ear group 6 are respectively extended to respectively penetrate through the positive pole ear hole 3 and the negative pole ear hole 4 and finally extend out of the top cover 2, so that the positive pole and the negative pole are not required to be added, the internal resistance of the secondary battery is reduced due to the fact that the positive pole and the negative pole are cancelled, and the heating of the parts of the connection parts of the positive pole ear group 5 and the negative pole ear group 6 and the positive pole and the negative pole is reduced accordingly.

The tab or the tab group is a metal conductor connected to the positive electrode and the negative electrode of the battery cell and is also a contact point when the secondary battery is charged and discharged. In the working process of the secondary battery, electrons flow from the positive electrode tab to the negative electrode tab, the flowing width of the electrons is inversely proportional to or the internal resistance of the tab battery, and the internal loss power of the secondary battery is directly proportional to the square of the internal resistance, so that the larger contact area of the tab or the tab group is beneficial to reducing the internal resistance of the secondary battery and improving the output power of the secondary battery.

In the present embodiment, there are many different embodiments regarding the number and the type of the positive electrode tab group 5 and the negative electrode tab group 6, the number and the type of the positive electrode tab hole 3 and the negative electrode tab hole 4, and so on, and for better understanding of the present embodiment, three embodiments thereof will be described as an example.

In the first embodiment, as shown in fig. 1-2, there is one positive electrode tab group 5 and one negative electrode tab group 6;

the top cover 2 comprises an upper top cover 201;

It should be noted that, in this embodiment, a manner of outputting two electrode tab groups is adopted, that is, only one positive electrode tab group 5 and one negative electrode tab group 6 are provided, and one positive electrode tab group 5 and one negative electrode tab group 6 are provided at the upper end of the electric core 1, and accordingly, only one top cover 2 is required, that is, the top cover 2 only includes the upper top cover 201. The upper top cover 201 and the shell 12 are welded by laser, and the explosion-proof valve and the liquid injection hole are respectively arranged at two sides of the top cover 201.

In the second embodiment, as shown in fig. 3 to 4, there is also one positive electrode tab group 5 and one negative electrode tab group 6;

however, unlike the first embodiment, in this embodiment, one positive electrode tab group 5 and one negative electrode tab group 6 are provided at different ends of the battery cell 1;

at this time, correspondingly, the top cover 2 comprises an upper top cover 201 and a lower top cover 202;

It should be noted that, in this embodiment, a manner of forming two tab groups from top to bottom is adopted, that is, only one positive tab group 5 and one negative tab group 6 are provided, and one positive tab group 5 and one negative tab group 6 are respectively disposed at the upper end and the lower end of the battery cell 1, and two corresponding top covers 2 are also required, that is, the top cover 2 needs to include an upper top cover 201 and a lower top cover 202. The upper top cover 201 and the lower top cover 202 are respectively laser welded with the shell 12, the design of the liquid injection hole can be positioned on the upper top cover 201 or the lower top cover 202, and the design of the explosion-proof valve can be positioned on the side surface of the shell 12.

In the third embodiment, two positive electrode tab groups 5 are provided, and two negative electrode tab groups 6 are provided;

the top cover 2 comprises an upper top cover 201 and a lower top cover 202;

as shown in fig. 5-6, two positive electrode tab groups 5 are disposed at one end of the battery cell 1, and two negative electrode tab groups 6 are disposed at the other end of the battery cell 1; the upper top cover 201 is provided with two positive electrode ear holes 3 corresponding to the two positive electrode ear groups 5, and the lower top cover 202 is provided with two negative electrode ear holes 4 corresponding to the two negative electrode ear groups 6;

or, as shown in fig. 7 to 8, the two positive electrode tab groups 5 are respectively disposed at two ends of the electric core 1 and located at the same side, and the two negative electrode tab groups 6 are respectively disposed at two ends of the electric core 1 and located at the same side; the upper top cover 201 is provided with one positive ear hole 3 corresponding to one positive ear group 5 and one negative ear hole 4 corresponding to one negative ear group 6, and the lower top cover 202 is provided with one positive ear hole 3 corresponding to one positive ear group 5 and one negative ear hole 4 corresponding to one negative ear group 6;

or, as shown in fig. 9 to 10, the two positive electrode tab groups 5 are respectively disposed at two ends of the battery cell 1 and located at different sides, and the two negative electrode tab groups 6 are respectively disposed at two ends of the battery cell 1 and located at different sides; the upper top cover 201 is provided with one positive ear hole 3 corresponding to one positive ear group 5 and one negative ear hole 4 corresponding to one negative ear group 6, and the lower top cover 202 is provided with one positive ear hole 3 corresponding to one positive ear group 5 and one negative ear hole 4 corresponding to one negative ear group 6.

It should be noted that, in this embodiment, a manner that four tab groups are formed vertically is adopted, that is, there are two positive tab groups 5 and two negative tab groups 6, and the two positive tab groups 5 and the two negative tab groups 6 can be flexibly arranged at the upper and lower ends of the electric core 1, and two top covers 2 are also needed correspondingly, that is, the top cover 2 needs to include an upper top cover 201 and a lower top cover 202. The upper top cover 201 and the lower top cover 202 are respectively laser welded with the shell 12, and the explosion-proof valve, the liquid injection hole and the like are respectively positioned on the upper top cover 201 or the lower top cover 202.

It is understood that, in this embodiment, the internal resistance of the secondary battery is more reduced by the four-pole tab group than by the first two-pole tab groups.

In the present embodiment, as shown in fig. 11, a first polymer diffusion welding region 7 is formed by polymer diffusion welding at both one end of the positive electrode tab group 5 close to the battery cell 1 and one end of the negative electrode tab group 6 close to the battery cell 1;

It should be noted that, in this embodiment, polymer diffusion welding is performed on the end of the positive electrode tab group 5 and the end of the negative electrode tab group 6 close to the electric core 1 and the end far away from the electric core 1, respectively, so that the tab layers with a certain area at the two ends are directly and tightly combined, and the use of a connecting bolt and a nut can be eliminated, thereby not only further reducing the internal resistance of the secondary battery, but also solving the defects that the tab deformation, the position of the mounting hole changes, the tab is easily damaged, the conductive area of the tab is reduced, the conductive performance is affected, the cost is increased, and the like, which may be brought by the prior art.

In the present embodiment, a part of the first polymer diffusion bonding region 7, the second polymer diffusion bonding region 8, a region of the positive electrode tab group 5 that is not polymer diffusion bonded, and a region of the negative electrode tab group 6 that is not polymer diffusion bonded are exposed to the top cover 2;

The region of the positive electrode tab group 5 that is not subjected to polymer diffusion welding refers to a region of the positive electrode tab group 5 that is spaced between the first polymer diffusion welding region 7 and the second polymer diffusion welding region 8; the region of the negative electrode tab group 6 that is not subjected to polymer diffusion welding refers to a region of the negative electrode tab group 6 that is spaced between the first polymer diffusion welding region 7 and the second polymer diffusion welding region 8.

In the present embodiment, as shown in fig. 12, an annular seal groove 9 is formed around each of the positive electrode tab hole 3 and the negative electrode tab hole 4;

or, as shown in fig. 13, the inner wall of the positive ear hole 3 and the inner wall of the negative ear hole 4 are both provided with annular protrusions 10, and annular convex walls 11 are both provided around the positive ear hole 3 and around the negative ear hole 4.

It should be noted that, no matter the annular sealing groove 9 or the annular protrusion 10 plus the annular protruding wall 11 is provided, the purpose is to make the contact position of the top cover 2 and the tab of the positive electrode tab group 5 or the negative electrode tab group 6 be sealed and protected by injecting a sealant. The annular sealing groove 9 and the annular bulge 10 are used for improving the sealing effect after glue injection, and the annular convex wall 11 is used for improving the glue injection amount, so that the sealing effect after glue injection is further improved.

In this embodiment, the depth of the annular sealing groove 9 is 0.2 to 0.4 times the thickness of the top cover 2, and the length and the width of the annular sealing groove 9 are 1.05 to 1.50 times the length and the width of the positive electrode ear hole 3 or the negative electrode ear hole 4, respectively;

the width of the positive lug hole 3 is 1-4mm larger than that of the positive lug group 5, and the length of the positive lug hole 3 is 1-4mm larger than that of the positive lug group 5;

In this embodiment, as shown in fig. 1-2, one positive electrode tab group 5 and one negative electrode tab group 6 located at the same end of the battery cell 1 are reversely turned over and are both turned over outward, and one positive electrode tab group 5 and one negative electrode tab group 6 are arranged in a high-low arrangement;

or, as shown in fig. 3 to 4, one positive electrode tab group 5 and one negative electrode tab group 6 located at different ends of the battery core 1 are reversely turned over and are turned over outwards, and one positive electrode tab group 5 and one negative electrode tab group 6 are arranged in a high-low manner;

or, as shown in fig. 5 to 6, the two positive tab groups 5 located at the same end of the battery core 1 are reversely turned over and are both turned over outwards, and the two positive tab groups 5 are arranged in a high-low manner; the two negative electrode tab groups 6 positioned at the same end of the battery core 1 are reversely turned over and are all turned over outwards, and the two negative electrode tab groups 6 are arranged in a high-low mode;

or, as shown in fig. 7 to 8, the two positive tab groups 5 located at different ends of the battery core 1 are folded in the same direction and are both folded outward, and the heights of the two positive tab groups 5 are the same; the two negative electrode lug groups 6 positioned at different ends of the battery core 1 are turned over in the same direction and are turned over outwards, and the heights of the two negative electrode lug groups 6 are the same; the height of the positive electrode tab group 5 is greater than that of the negative electrode tab group 6;

or, as shown in fig. 9 to 10, the two positive tab groups 5 located at different ends of the battery core 1 are reversely turned over and are both turned over outwards, and the heights of the two positive tab groups 5 are the same; the two negative electrode tab groups 6 positioned at different ends of the battery core 1 are reversely turned over and are turned over outwards, and the heights of the two negative electrode tab groups 6 are the same; the height of the positive electrode tab group 5 is greater than that of the negative electrode tab group 6.

It should be noted that, in this embodiment, the positive tab group 5 and the negative tab group 6 are folded, so that when the secondary battery and the secondary battery are combined side by side to form a battery module, the positive tab group 5 and the negative tab group 6 can be respectively and directly overlapped with the negative tab group 6 and the positive tab group 5 on another secondary battery, that is, the positive tab group 5 and the negative tab group 6 also replace the function of a busbar, and further can reduce the internal resistance of the secondary battery, and reduce the temperature rise of the secondary battery.

Although terms such as a battery cell, a top cover, a positive electrode tab hole, a negative electrode tab hole, a positive electrode tab group, a negative electrode tab group, a first polymer diffusion welding area, a second polymer diffusion welding area, an annular sealing groove, an annular bulge, an annular convex wall, a shell and the like are used in the present document, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

The embodiment of the utility model provides a pair of secondary battery, just, negative pole ear crowd prolongs respectively and stretches out in the top cap in order to replace just, on the basis of negative pole post, through with just, the width design of negative pole ear crowd is 0.8-0.95 times of electric core width for can further reduce secondary battery's internal resistance, thereby secondary battery's temperature rise when reducing fast charge by a wide margin has not only improved secondary battery's performance and security, but also provided secondary battery's output, higher market spreading value has.

Example two

Referring to fig. 14-15, an embodiment of the present invention provides a battery module, including at least two secondary batteries as described in the first embodiment;

The secondary battery in the present embodiment may be applied to, but not limited to, electronic devices such as electronic devices, electric vehicles, or power storage systems. The electronic device may be, for example, various computers, mobile phones, display panels, and the like, which use a secondary battery as a driving power source. The electric vehicle may be, for example, an electric vehicle, an electric tricycle, an electric bicycle, or the like that uses a secondary battery as a driving power source. The power storage system may be, for example, a power storage system that utilizes a secondary battery as a power storage source.

In these electronic devices, the secondary battery may be electrically connected to the electric element to supply electric power to the electric element. Because the rapid charging ability of the secondary battery provided by the application is excellent, the electronic equipment is favorably used in application scenes such as outdoor energy storage, short-time power supply, mobile energy storage and the like, so that the application scenes of the electronic equipment are wider.

The embodiment of the utility model provides a pair of battery module, just, negative pole ear crowd prolongs respectively and stretches out in the top cap in order to replace just, on the basis of negative pole post, through with just, the width design of negative pole ear crowd is 0.8-0.95 times of electric core width for can further reduce secondary battery's internal resistance, thereby secondary battery's temperature rise when reducing fast charge by a wide margin has not only improved secondary battery's performance and security, but also provided secondary battery's output, higher market spreading value has.

The foregoing description of the embodiments has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same elements or features may also vary in many respects. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.

Example embodiments are provided so that this disclosure will be thorough and will fully convey the scope to those skilled in the art. Numerous details are set forth, such as examples of specific parts, devices, and methods, in order to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In certain example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises" and "comprising" are intended to be inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed and illustrated, unless explicitly indicated as an order of performance. It should also be understood that additional or alternative steps may be employed.

When an element or layer is referred to as being "on … …", "engaged with … …", "connected to" or "coupled to" another element or layer, it can be directly on, engaged with, connected or coupled to the other element or layer, or intervening elements or layers may also be present. In contrast, when an element or layer is referred to as being "directly on … …," "directly engaged with … …," "directly connected to" or "directly coupled to" another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship of elements should be interpreted in a similar manner (e.g., "between … …" and "directly between … …", "adjacent" and "directly adjacent", etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region or section from another element, component, region or section. Unless clearly indicated by the context, use of terms such as the terms "first," "second," and other numerical values herein does not imply a sequence or order. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

Spatially relative terms, such as "inner," "outer," "below," "… …," "lower," "above," "upper," and the like, may be used herein for ease of description to describe a relationship between one element or feature and one or more other elements or features as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below … …" can encompass both an orientation of facing upward and downward. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors herein interpreted.

Claims

1. A secondary battery, characterized in that the battery comprises a cell (1) and a top cover (2); wherein,

the top cover (2) is provided with a positive pole ear hole (3) and a negative pole ear hole (4);

the battery cell (1) is provided with a positive electrode tab group (5) formed by laminating positive electrode tabs and a negative electrode tab group (6) formed by laminating negative electrode tabs;

the positive lug group (5) penetrates through the positive lug hole (3) to extend outwards, and the width of the positive lug group (5) is 0.8-0.95 times of the width of the battery core (1);

the negative electrode ear group (6) penetrates through the negative electrode ear hole (4) to extend outwards, and the width of the negative electrode ear group (6) is 0.8-0.95 times of the width of the battery core (1).

2. The secondary battery according to claim 1, wherein there is one positive electrode tab group (5) and one negative electrode tab group (6);

the positive electrode lug group (5) and the negative electrode lug group (6) are arranged at the same end of the battery cell (1);

the top cover (2) comprises an upper top cover (201);

the upper top cover (201) is provided with one positive pole ear hole (3) corresponding to one positive pole ear group (5) and one negative pole ear hole (4) corresponding to one negative pole ear group (6).

3. The secondary battery according to claim 1, wherein there is one positive electrode tab group (5) and one negative electrode tab group (6);

the positive electrode lug group (5) and the negative electrode lug group (6) are arranged at different ends of the battery cell (1);

the top cover (2) comprises an upper top cover (201) and a lower top cover (202);

the upper top cover (201) is provided with one positive electrode ear hole (3) corresponding to one positive electrode ear group (5), and the lower top cover (202) is provided with one negative electrode ear hole (4) corresponding to one negative electrode ear group (6);

or, the upper top cover (201) is provided with one negative pole ear hole (4) corresponding to one negative pole ear group (6), and the lower top cover (202) is provided with one positive pole ear hole (3) corresponding to one positive pole ear group (5).

4. The secondary battery according to claim 1, wherein there are two positive electrode tab groups (5) and two negative electrode tab groups (6);

the two positive electrode lug groups (5) are arranged at one end of the battery cell (1), and the two negative electrode lug groups (6) are arranged at the other end of the battery cell (1); the upper top cover (201) is provided with two positive electrode ear holes (3) corresponding to the two positive electrode ear groups (5), and the lower top cover (202) is provided with two negative electrode ear holes (4) corresponding to the two negative electrode ear groups (6);

or the two positive electrode lug groups (5) are respectively arranged at two ends of the battery cell (1) and are positioned at the same side, and the two negative electrode lug groups (6) are respectively arranged at two ends of the battery cell (1) and are positioned at the same side; the upper top cover (201) is provided with one positive electrode ear hole (3) corresponding to one positive electrode ear group (5) and one negative electrode ear hole (4) corresponding to one negative electrode ear group (6), and the lower top cover (202) is provided with one positive electrode ear hole (3) corresponding to one positive electrode ear group (5) and one negative electrode ear hole (4) corresponding to one negative electrode ear group (6);

or the two positive electrode lug groups (5) are respectively arranged at two ends of the battery cell (1) and are positioned at different sides, and the two negative electrode lug groups (6) are respectively arranged at two ends of the battery cell (1) and are positioned at different sides; the upper top cover (201) is provided with one positive ear hole (3) corresponding to one positive ear group (5) and one negative ear hole (4) corresponding to one negative ear group (6), and the lower top cover (202) is provided with one positive ear hole (3) corresponding to one positive ear group (5) and one negative ear hole (4) corresponding to one negative ear group (6).

5. The secondary battery according to claim 1 or 2 or 3 or 4, wherein one end of the positive electrode tab group (5) close to the battery core (1) and one end of the negative electrode tab group (6) close to the battery core (1) are both formed into a first polymer diffusion welding area (7) by polymer diffusion welding;

the positive electrode lug group (5) is far away from one end of the battery cell (1) and the negative electrode lug group (6) is far away from one end of the battery cell (1) to form a second polymer diffusion welding area (8) in a polymer diffusion welding mode.

6. The secondary battery according to claim 5, wherein a part of the first polymer diffusion-welded region (7), the second polymer diffusion-welded region (8), a region of the positive electrode tab group (5) that is not polymer diffusion-welded, and a region of the negative electrode tab group (6) that is not polymer diffusion-welded are exposed to the top cover (2);

in the part of the positive tab group (5) exposed out of the top cover (2), the area occupied by the region of the positive tab group (5) which is not subjected to high molecular diffusion welding is 20-70%;

in the part of the negative electrode tab group (6) exposed out of the top cover (2), the area occupied by the region of the negative electrode tab group (6) not subjected to macromolecular diffusion welding is 20-70%;

the part of the first polymer diffusion welding area (7) exposed out of the top cover (2) accounts for 2-10% of the sum of the areas of the first polymer diffusion welding area (7) and the second polymer diffusion welding area (8).

7. The secondary battery according to claim 1 or 2 or 3 or 4, wherein an annular sealing groove (9) is formed around the positive electrode ear hole (3) and around the negative electrode ear hole (4);

or, the inner wall of positive pole earhole (3) with the inner wall of negative pole earhole (4) all is provided with annular arch (10), just around positive pole earhole (3) with all be provided with annular protruding wall (11) around negative pole earhole (4).

8. The secondary battery according to claim 7, wherein the depth of the annular sealing groove (9) is 0.2-0.4 times the thickness of the top cap (2), and the length and width of the annular sealing groove (9) are 1.05-1.50 times the length and width of the positive ear hole (3) or the negative ear hole (4), respectively;

the width of the positive ear hole (3) is 1-4mm larger than that of the positive ear group (5), and the length of the positive ear hole (3) is 1-4mm larger than that of the positive ear group (5);

the width of the negative electrode ear hole (4) is 1-4mm larger than that of the negative electrode ear group (6), and the length of the negative electrode ear hole (4) is 1-4mm larger than that of the negative electrode ear group (6).

9. The secondary battery according to claim 2, 3 or 4, wherein one positive electrode tab group (5) and one negative electrode tab group (6) at the same end of the battery core (1) are reversely turned and are turned outwards, and one positive electrode tab group (5) and one negative electrode tab group (6) are arranged in a high-low arrangement;

or one positive electrode tab group (5) and one negative electrode tab group (6) which are positioned at different ends of the battery core (1) are reversely turned over and are turned over outwards, and one positive electrode tab group (5) and one negative electrode tab group (6) are arranged in a high-low mode;

or the two positive electrode lug groups (5) positioned at the same end of the battery core (1) are reversely turned over and are all turned over outwards, and the two positive electrode lug groups (5) are arranged in a high-low mode; the two negative electrode tab groups (6) positioned at the same end of the battery core (1) are reversely turned over and are all turned over outwards, and the two negative electrode tab groups (6) are arranged in a high-low mode;

or the two positive lug groups (5) positioned at different ends of the battery core (1) are reversely turned over and are both turned over outwards, and the heights of the two positive lug groups (5) are the same; the two negative electrode tab groups (6) positioned at different ends of the battery core (1) are reversely turned over and are all turned over outwards, and the heights of the two negative electrode tab groups (6) are the same; the height of the positive electrode tab group (5) is greater than that of the negative electrode tab group (6);

or the two positive lug groups (5) positioned at different ends of the battery core (1) are turned over in the same direction and are turned over outwards, and the heights of the two positive lug groups (5) are the same; the two negative electrode lug groups (6) positioned at different ends of the battery cell (1) are turned over in the same direction and are turned over outwards, and the heights of the two negative electrode lug groups (6) are the same; the height of the positive electrode tab group (5) is greater than that of the negative electrode tab group (6).

10. A battery module comprising at least two secondary batteries according to any one of claims 1 to 9;

the secondary battery is characterized in that at least two secondary batteries are arranged side by side, a positive electrode tab group (5) in each secondary battery is overlapped with a negative electrode tab group (6) in the other secondary battery, and the negative electrode tab group (6) in each secondary battery is overlapped with the positive electrode tab group (5) in the other secondary battery.