CN110690401B

CN110690401B - Battery structure, battery and preparation method thereof

Info

Publication number: CN110690401B
Application number: CN201810732062.XA
Authority: CN
Inventors: 卫志达; 胡延钢; 赵玉振
Original assignee: Dongguan Amperex Technology Ltd
Current assignee: Dongguan Amperex Technology Ltd
Priority date: 2018-07-05
Filing date: 2018-07-05
Publication date: 2022-07-05
Anticipated expiration: 2038-07-05
Also published as: CN115000640A; CN110690401A; CN115000640B

Abstract

The present invention provides a battery structure, comprising: a circuit element including a first contact and a second contact arranged in a first direction; a patch; and rolling out the sheet; wherein: the switching piece includes: a first transition section coupled with the first contact; the second switching section extends from the first switching section along a second direction, and the second direction is vertical to the first direction; the roll-out sheet includes: a first turn-out section coupled with the second contact; the second roll-out section is connected with the first roll-out section; and a third roll-out section extending from the second roll-out section. The invention also provides a battery and a preparation method thereof. The invention aims to provide a battery structure, a battery and a preparation method thereof, which at least reduce the risk of breaking a breaker pin in a switching process and simplify the switching process.

Description

Battery structure, battery and preparation method thereof

Technical Field

The invention relates to the field of batteries, in particular to a battery structure, a battery comprising the battery structure and a preparation method of the battery.

Background

The Thermal fuse (TCO) can sense overheating generated during abnormal operation of the electronic product, thereby cutting off a loop to prevent a fire. In battery products, in-situ TCO structures are typically used for over-temperature protection.

In the in-situ TCO transfer process, the next step can be carried out only by sticking and positioning the in-situ TCO on the top seal of the cell, and at the moment, the transfer-out piece and the transfer piece are overlapped above the first lug, so that the welding of the first lug and the transfer piece cannot be realized, and the transfer-out piece is lifted up to be welded; after the roll-out piece is lifted to realize the welding of the first tab and the switching piece, the roll-out piece is pressed down to be parallel to the top seal of the battery core, and then the flow of the whole process is completed.

Therefore, the whole transfer process is complex, and the transferred sheet is lifted and pressed, so that the stress vertical to the cell main body exists at the bending part, and the transferred sheet is warped and is regarded as a defective product; in addition, can drive circuit breaker pin atress when changeing out the piece reciprocal bending, this can increase circuit breaker pin rupture inefficacy risk.

Disclosure of Invention

In view of the problems in the related art, an object of the present invention is to provide a battery structure, a battery and a method for manufacturing the same, so as to at least reduce the risk of breaking the breaker pin in the switching process and simplify the switching process.

To achieve the above object, the present invention provides a battery structure comprising: a circuit element including a first contact and a second contact arranged in a first direction; a patch; and a roll-out sheet. Wherein: the switching piece includes: a first transition section coupled with the first contact; and the second switching section extends from the first switching section along a second direction, and the second direction is vertical to the first direction. The roll-out sheet includes: a first turn-out section coupled with the second contact; the second roll-out section is connected with the first roll-out section; and a third roll-out section extending from the second roll-out section.

According to an embodiment of the invention, the roll-out sheet further comprises a transition section connecting the first roll-out section and the second roll-out section.

According to one embodiment of the invention, the first roll-out section and the second roll-out section are parallel and out-of-plane to each other.

According to one embodiment of the invention, the first roll-out section and the second roll-out section are perpendicular to each other.

According to one embodiment of the invention, the first roll-out section is coplanar with the second roll-out section.

According to an embodiment of the invention, a first plane in which the first roll-out section is located and a second plane in which the second roll-out section is located are perpendicular to each other.

According to one embodiment of the invention, the second roll-out section and the third roll-out section are perpendicular to each other.

According to an embodiment of the invention, the second switching section and the third switching-out section have the same width in the first direction.

According to one embodiment of the invention, the second switching section is aligned with the third switching-out section in the second direction.

According to one embodiment of the invention, the second transition section is provided with a first groove near the first end of the first transition section.

According to one embodiment of the invention, the first groove comprises a pair of first grooves disposed on opposite sides of the second transition section.

According to an embodiment of the invention, the third roll-out section is provided with a second groove near the first end of the second roll-out section.

According to one embodiment of the invention, the first contact is a current input of the circuit element; the second contact member is a current output terminal of the circuit element.

According to one embodiment of the invention, the circuit element comprises a circuit breaker.

According to another aspect of the present invention, there is provided a battery including the above battery structure, wherein the second transition section is coupled to a first tab of the battery; the battery structure enables the roll-out piece to turn over and extend out along the extending direction of the first pole lug through bending.

According to another aspect of the present invention, there is provided a method of manufacturing the above battery, the method comprising: coupling the second adapting section with a first tab of the battery to form a first coupling area; and bending the battery structure to enable the roll-out piece to turn over and extend out along the extending direction of the first pole lug.

According to one embodiment of the invention, the bending step comprises the steps of: folding the first coupling region at the first groove to enable the first coupling region to cover the first tab; and continuously bending the first coupling region to enable the rotating-out piece to turn over and extend out along the extending direction of the first tab.

According to one embodiment of the invention, the bending step comprises the steps of: folding the first coupling region at the first groove to enable the first coupling region to cover the first tab; and continuously bending the second groove to enable the roll-out piece to turn over and extend out along the extending direction of the first pole lug.

The beneficial technical effects of the invention are as follows:

in the battery structure of the invention, the tail end of the adapter sheet and the tail end of the roll-out sheet are positioned at two sides of the circuit element and are not overlapped, so that in the transfer process, the adapter sheet can be directly welded to the first pole lug of the battery without lifting the roll-out sheet, and then the roll-out sheet can be turned to a proper position at the top of the battery only by bending the adapter sheet and the first pole lug of the battery. In the whole transfer process, the transfer piece and the second contact connected with the transfer piece are not subjected to any force, so that the transfer piece cannot be tilted upwards, and the risk of breaking and failure of the circuit element pins is remarkably reduced.

Drawings

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

Fig. 1 is a perspective view of a battery structure according to an embodiment of the present invention;

FIG. 2 is a front view of the battery construction shown in FIG. 1;

FIG. 3A is a schematic structural diagram of an interposer of the battery structure of the embodiment shown in FIG. 1;

FIG. 3B shows a schematic structural diagram of an interposer according to another embodiment of the present invention;

FIG. 4 is a schematic diagram showing the construction of a roll-out sheet of the battery construction of the embodiment shown in FIG. 1;

fig. 5 to 7 are schematic diagrams respectively illustrating various stages of a transfer process of the battery structure to the battery cell of the embodiment shown in fig. 1;

fig. 8 is a perspective view of a battery structure according to another embodiment of the present invention;

FIG. 9 is a schematic diagram showing the construction of a roll-out piece of the battery construction of the embodiment shown in FIG. 8;

FIG. 10 shows a schematic structural view of a roll-out piece according to another embodiment of the invention;

fig. 11 to 13 respectively show schematic diagrams of various stages of the transfer process of the battery structure to the battery cell of the embodiment shown in fig. 1.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the following embodiments may be combined with or partially replaced by each other in any possible manner.

Reference is first made to fig. 1 to 4, which show a battery structure according to an embodiment of the present invention. As shown, the battery structure includes a circuit element 10, illustratively, in one possible embodiment of the invention, the circuit element 10 includes a circuit breaker. As shown in fig. 1 and 2, the circuit element 10 is provided with a first contact 12 and a second contact 14 extending along a first direction T1, wherein the sections of the first contact 12 and the second contact 14 exposed from the body of the circuit element 10 may also be referred to herein as pins of the circuit element 10, and the interposer 16 and the roll-out piece 18 are coupled to the first contact 12 and the second contact 14 of the circuit element 10, respectively.

Illustratively, in one embodiment of the present invention, the first contact 12 is a current input of the circuit element 10, and the second contact 14 is a current output of the circuit element 10; that is, when the circuit element 10 is connected to a battery, the first contact 12 is coupled to a positive tab of the battery and the second contact 14 is coupled to a negative tab of the battery.

In a possible embodiment of the present invention, the interposer 16 may be configured in an L-shape as shown in fig. 3A or an I-shape as shown in fig. 3B, and includes a first transition segment 20 coupled to the first contact 12 of the circuit element 10 and a second transition segment 22 extending from the first transition segment 20 along a second direction T2, wherein the first direction T1 is perpendicular to the second direction T2. In addition, as shown in fig. 4, the roll-out tab 18 includes a first roll-out section 24 coupled with the second contact member 14, a second roll-out section 32 connected with the first roll-out section 24, and a third roll-out section 26 extending from the second roll-out section 32.

In the above-described embodiment of the battery structure, as shown in fig. 1, the second switching section 22 of the switching tab 16 and the third switching section 26 of the switching tab 18 are respectively located at both sides of the circuit element 10 along the second direction T2, so that the second switching section 22 and the third switching section 26 do not overlap each other, so that the switching tab 16 can be directly welded to the battery tab without lifting the switching tab 18 in the switching process, and then the switching tab 18 can be turned over to the proper position on the top of the battery simply by bending the switching tab 16 and the battery tab. The turn-out piece 18 and the second contact 14 of the circuit element 10 to which it is connected are not subjected to any force during the entire transfer process, so that the turn-out piece 18 does not lift upward, thereby significantly reducing the risk of pin fracture failure of the circuit element 10.

Illustratively, referring to fig. 1-4, in one embodiment of a battery structure according to the present invention, the roll-out tabs 18 are configured to have an L-shape. As shown in fig. 4 in particular, the roll-out piece 18 further includes a transition section 34, and the transition section 34 smoothly connects the first roll-out section 24 with the second roll-out section 32, so that the roll-out piece 18 can extend closer to the main body of the circuit component 10, thereby making the overall structure of the battery structure more compact and further reducing the packaging space.

In addition, in one embodiment of the battery structure of the present invention, as shown in fig. 1 and 2, the first roll-out section 24 and the second roll-out section 32 are parallel to and out-of-plane with each other; in other words, in this embodiment, the plane of the first roll-out section 24 and the plane of the second roll-out section 32 are parallel to each other and are connected by the transition section 34.

Alternatively, as shown in fig. 8 to 10, another embodiment of the battery structure according to the present invention is shown. In this embodiment, the roll-out tabs 18 have a generally Z-shape, as best illustrated in FIG. 9. Specifically, as shown in fig. 9, the first turning-out section 24 and the second turning-out section 32 of the turning-out piece 18 are perpendicular to each other, that is, the extending direction of the first turning-out section 24 and the extending direction of the second turning-out section 32 are perpendicular to each other. Further, in an exemplary embodiment, as shown in fig. 9, the first roll-out section 24 and the second roll-out section 32 are coplanar with one another. Alternatively, in another exemplary embodiment, as shown in fig. 10, the first and second roll-out

sections

24, 32 of the roll-out tabs 18 are disposed in first and second planes, respectively, that are perpendicular to each other, i.e., the plane in which the first roll-out section 24 lies and the plane in which the second roll-out section 32 lies are perpendicular to each other. It will of course also be understood that the embodiment of the roll-out tab 18 shown in fig. 10 is formed by bending the first roll-out section 24 of the embodiment of the roll-out tab 18 shown in fig. 9 by 90 degrees relative to the second roll-out section 32.

In the above embodiments illustrated in fig. 8 to 10, the second switching section 22 of the switching sheet 16 and the third turning-out section 26 of the turning-out sheet 18 are respectively located at two sides of the circuit element 10 along the second direction T2, or in other words, the second switching section 22 and the third turning-out section 26 do not overlap with each other, so that the switching sheet 16 can be directly welded to the battery tab without lifting the turning-out sheet 18 in the switching process, and therefore, poor tilting of the turning-out sheet 18 can be avoided, and the risk of pin fracture failure of the circuit element 10 is significantly reduced.

Illustratively, in some embodiments of the battery structure of the present invention, as shown in fig. 4, 9 and 10, the second swing-out section 32 and the third swing-out section 26 are perpendicular to each other, i.e., the extending directions of the two are perpendicular to each other.

Referring additionally to fig. 1 and 8, in accordance with some embodiments of the battery structure of the present invention, the width of the second transition section 22 of the interposer 16 along the first direction T1 is substantially equal to the width of the third roll-out section 26 of the roll-out tab 18 along the first direction T1. Illustratively, in some embodiments of the battery structure of the present invention, referring to fig. 1 and 8, the second transition section 22 of the interposer 16 and the third transition section 26 of the transition piece 18 are aligned with each other along the second direction T2, such that when the transition piece 16 and the battery tab are bent, the transition piece 18 can protrude from the top end of the battery at a position aligned with the battery tab, effectively reducing the packaging space, and thus the battery structure of the present invention is particularly suitable for narrow cell transition processes.

In order to better achieve the bend in the transition process, in one possible embodiment of the invention, as shown in fig. 3A and 3B, a first groove 28 is provided in the second transition section 22 of the transition piece 16 near the first end of the first transition section 20. Illustratively, according to one embodiment of the present invention, a pair of first grooves 28 are provided along opposite edges of the second transition segment 22, wherein the width of each groove 28 may be set to 1 mm.

Similarly, in one possible embodiment of the present invention, as shown in fig. 4 and 9, a second groove 36 is provided at a first end of the third roll-out section 26 adjacent to the second roll-out section 32 to facilitate better bending during the transfer process.

In another aspect, the present invention provides a battery 40. In one possible embodiment of the present invention, as shown in fig. 7, the battery 40 includes the battery structure shown in fig. 1, wherein the second adapter section 22 of the adapter sheet 16 is coupled with the first tab 42 of the battery 40 by welding or the like, and the battery structure is bent to turn the adapter sheet 18 and extend along the extending direction of the first tab 42, so as to be matched with the second tab to supply power to the electric device.

A method of manufacturing the battery 40 according to an embodiment of the present invention is explained below with reference to fig. 5 to 7. The method comprises the following steps: the second adaptor section 22 of the adaptor sheet 16 is coupled to the first tab 42 of the battery 40 as shown in fig. 5 to form a first coupling region, and then the battery structure is bent as shown in fig. 6 and 7 such that the tab 18 is inverted and extends in the direction in which the first tab 42 extends.

Further, the above bending step further comprises: as shown in fig. 6, the first coupling region is turned over at the first groove 28 of the adapting sheet 16 to cover the first tab 42, and then as shown in fig. 7, the turning over of the first coupling region is continued to turn over the turned-out sheet 18 and extend along the extending direction of the first tab 42, thereby completing the entire adapting process.

Specifically, as shown in fig. 5, the battery structure is first positioned on the back side of the battery cell, and since the second switching section 22 of the switching sheet 16 and the third switching section 26 of the switching sheet 18 are respectively positioned on both sides of the circuit element 10, only the switching sheet 16 and the first tab 42 overlap, and the switching sheet 18 does not overlap with the first tab 42 and the switching sheet 16, the switching sheet 16 and the first tab 42 can be welded without lifting the switching sheet 18 upward. Then, as shown in fig. 6, the welding zone of the interposer 16 and the first tab 42 is bent by 180 °, so that the first tab 42 is wrapped in the interposer 16 to form a first bent portion. Then, as shown in fig. 7, the first bending portion is turned over by 180 °, the whole of the circuit component 10 is turned over by 180 ° and then attached to the top seal of the battery cell, and at this time, the turning-out piece 18 is turned over to the top of the battery 40, so that the whole switching process is completed. In the whole process, the roll-out piece 18 and the pins of the circuit element 10 are not subjected to any force, and similarly, stress perpendicular to the surface of the battery cell does not exist, so that the roll-out piece 18 cannot be tilted upwards, and the pins of the circuit element 10 cannot be broken or failed due to stress.

Alternatively, in another possible embodiment of the present invention, as shown in fig. 13, the battery 40 includes a battery structure shown in fig. 8, wherein the second adapter section 22 of the adapter sheet 16 and the first tab 42 of the battery 40 can be coupled by welding or the like and folded 180 degrees with the first tab 42, and the rotated-out sheet 18 is extended along the extending direction of the first tab 42 by pressing down to cooperate with the second tab to supply power to the electric device.

A method of manufacturing the battery 40 according to an embodiment of the present invention is explained below with reference to fig. 11 to 13. The method comprises the following steps: coupling the second interposer section 22 of the interposer 16 with the first tab 42 of the battery 40 to form a first coupling region; folding the first coupling region at the first groove 28 of the interposer 16 such that the first coupling region covers the first tab 42; the second groove 36 is bent continuously, so that the rolled-out piece 18 is turned over and extends in the extending direction of the first tab 42.

Specifically, as shown in fig. 11, after the battery structure is positioned and adhered to the top seal of the battery cell, a welding operation is performed, at this time, the adaptor sheet 16 overlaps the first tab 42, the turn-out sheet 18 is perpendicular to the battery cell main body, the welding of the adaptor sheet 16 and the first tab 42 is not interfered by the turn-out sheet 18, and the adaptor sheet 16 and the first tab 42 can be directly welded by resistance welding or laser welding; after the welding is completed, as shown in fig. 12, the interposer 16 is folded at 180 ° together with the first tab 42 at the first groove 28 and attached to the cell top seal; then, as shown in fig. 13, the transfer sheet 18 is pressed and bent along the second groove 36 to be parallel to the second tab of the battery cell, thereby completing the transfer process. In the transfer process, the transfer sheet 18 is bent only once, and the stress is parallel to the cell main body, so that the risk that the transfer sheet 18 is tilted to exceed the cell main body is eliminated.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery structure comprising:

a circuit element including a first contact and a second contact arranged in a first direction;

a patch; and

turning out the sheet;

wherein:

the adaptor piece includes:

a first transition segment coupled with the first contact and distal from the first contact along the first direction; and

the second switching section extends from the first switching section along a second direction, and the second direction is vertical to the first direction;

the roll-out sheet includes:

a first turn-out section coupled with the second contact;

a second turn-out section connected to the first turn-out section and extending toward the first junction section in the first direction; and

a third roll-out section extending from the second roll-out section;

the second switching section and the third roll-out section are both located on the same side as the first contact of the circuit element and extend away from the first contact, and are respectively located on two sides of the first contact along the second direction, and the second switching section and the third roll-out section are not overlapped with each other.

2. The battery structure of claim 1, wherein the roll-out tab further comprises a transition segment connecting the first roll-out segment and the second roll-out segment.

3. The battery structure of claim 2, wherein the first and second turn-out sections are parallel and out-of-plane with each other.

4. The battery structure of claim 1, wherein the first and second roll-out segments are perpendicular to each other.

5. The battery structure of claim 4, wherein the first out-turn segment is coplanar with the second out-turn segment.

6. The battery structure of claim 4, wherein a first plane in which the first turned-out section is located and a second plane in which the second turned-out section is located are perpendicular to each other.

7. The battery structure of claim 1, wherein the second roll-out section and the third roll-out section are perpendicular to each other.

8. The battery structure of claim 1, wherein the second and third out-turns have the same width in the first direction.

9. The battery structure of claim 1, wherein the second transition segment is aligned with the third exit segment along the second direction.

10. The battery structure of claim 1, wherein the second transition segment is provided with a first groove proximate the first end of the first transition segment.

11. The battery structure of claim 10, wherein the first recess comprises a pair of first recesses disposed on opposite sides of the second transition segment.

12. The battery structure of claim 1, wherein the third roll-out section is provided with a second groove proximate to the first end of the second roll-out section.

13. The battery structure according to claim 1,

the first contact is a current input end of the circuit element;

the second contact is a current output of the circuit element.

14. The battery structure of claim 1, wherein the circuit element comprises a circuit breaker.

15. A battery comprising the battery structure of any one of claims 1-14,

the second adapter segment is coupled with a first tab of the battery;

the battery structure enables the roll-out piece to turn over and extend out along the extending direction of the first pole lug through bending.

16. A method of making the battery of claim 15, comprising:

coupling the second transition segment with the first tab of the battery to form a first coupling region;

and bending the battery structure to enable the roll-out piece to turn over and extend out along the extending direction of the first pole lug.

17. The method of claim 16, wherein the bending step comprises the steps of:

folding the first coupling region at a first groove of the second transition section, the first groove being disposed near the first end of the first transition section, such that the first coupling region covers the first tab;

and continuously bending the first coupling area to enable the rotating-out piece to turn over and extend out along the extending direction of the first tab.

18. The method of claim 16, wherein the bending step comprises the steps of:

and continuously bending a second groove formed in the third roll-out section and close to the first end part of the second roll-out section, so that the roll-out piece is turned over and extends out along the extending direction of the first tab.