CN217035905U - Lithium battery connecting sheet structure and lithium battery - Google Patents
Lithium battery connecting sheet structure and lithium battery Download PDFInfo
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- CN217035905U CN217035905U CN202220870538.8U CN202220870538U CN217035905U CN 217035905 U CN217035905 U CN 217035905U CN 202220870538 U CN202220870538 U CN 202220870538U CN 217035905 U CN217035905 U CN 217035905U
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 32
- 238000003466 welding Methods 0.000 claims abstract description 52
- 229910000679 solder Inorganic materials 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model provides a lithium battery connecting sheet structure and a lithium battery, which comprises a connecting sheet body, a top cover and a battery cell, wherein the connecting sheet body comprises a first sheet body, a second sheet body and a third sheet body, the first sheet body and the second sheet body are horizontally arranged at intervals, the third sheet body is horizontally arranged between one ends of the first sheet body and the second sheet body, two edges of the third sheet body are respectively connected with the edges of the first sheet body and the second sheet body, a certain height difference exists between the third sheet body and the first sheet body as well as between the third sheet body and the second sheet body in the vertical direction, and the other ends of the first sheet body and the second sheet body extend along the length direction. And further reduce the appearance of insufficient solder joint or desoldering of utmost point post and connection piece laser welding.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a lithium battery connecting sheet structure and a lithium battery.
Background
At the present stage, square lithium cell is in order to improve its energy density, can parallelly connected two electric cores in the casing, be connected with the utmost point ear of two electric cores on the one hand through the connection piece, on the other hand and top cap upper electrode post are connected, U type thin slice structure is usually set to traditional connection piece structure, two afterbody of connection piece carry out ultrasonic welding with the utmost point ear of electric core respectively, the head and the utmost point post of connection piece carry out laser welding, traditional connection piece structure is applicable to the more narrow core ultrasonic welding that rolls up of utmost point ear, such utmost point ear can be directly and connection piece afterbody welding, because the ultrasonic welding area is little, can not lead to connecting portion head to warp, thereby can not influence connection piece and laser welding utmost point post. When the design of the battery core pole lug is very wide, if the connecting piece is welded according to the prior structure, the obvious effective welding length is insufficient, and meanwhile, the overcurrent capacity of the pole lug is insufficient. The conventional method is that the connecting sheet is still designed into a U-shaped sheet structure, the tail part length of the connecting sheet is lengthened to adapt to ultrasonic welding with a wide pole lug, but the large-area welding of the pole lug and the tail part of the connecting sheet inevitably causes the head part of the connecting sheet to deform, so that the surface of the position is uneven, and when the pole and the head part of the connecting sheet are subjected to laser welding, the phenomenon of insufficient welding or desoldering can be caused.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a lithium battery connecting sheet structure and a lithium battery, which are used for solving the problem that when a lug is subjected to ultrasonic welding, the connecting sheet is easy to generate welding deformation, and the laser welding of a pole and the connecting sheet is influenced.
The technical scheme of the utility model is realized as follows:
on one hand, the utility model provides a lithium battery connecting piece structure, which comprises a connecting piece body, a top cover and a battery cell, wherein the connecting piece body comprises a first piece body, a second piece body and a third piece body, the first piece body and the second piece body are horizontally arranged at intervals, the third piece body is horizontally arranged between one ends of the first piece body and the second piece body, two edges of the third piece body are respectively connected with the edges of the first piece body and the second piece body, a certain height difference exists between the third piece body and the first piece body and between the third piece body and the second piece body in the vertical direction, the other ends of the first piece body and the second piece body extend along the length direction, the first piece body and the second piece body are respectively subjected to ultrasonic welding with a lug on the battery cell, and the third piece body and a pole on the top cover are subjected to laser welding.
On the basis of the above technical scheme, preferably, the areas of the first sheet body and the second sheet body are equal, and the areas of the first sheet body and the second sheet body are greater than or equal to the area of the tab on the battery core.
Preferably, the area of the third sheet body is greater than or equal to the area of the pole, and the area of the third sheet body is smaller than the areas of the first sheet body and the second sheet body.
Further, preferably, the height difference of the third sheet body, the first sheet body and the second sheet body in the vertical direction is 1mm-5 mm.
On the basis of the technical scheme, preferably, the joints of the third sheet body, the first sheet body and the second sheet body are provided with arc parts.
Further, preferably, the arc portion is provided with a plurality of slits at equal intervals along a length direction thereof.
On the basis of the above technical scheme, preferably, the pole is laser-welded to the front surface or the back surface of the third sheet body.
Preferably, the first sheet body, the second sheet body and the third sheet body are integrally formed.
On the other hand, the utility model also discloses a lithium battery, which comprises the lithium battery connecting sheet structure and a shell used for installing the battery core and the top cover.
Compared with the prior art, the utility model has the following beneficial effects:
(1) the utility model discloses a lithium battery connecting sheet structure, which is characterized in that a connecting sheet body is formed by a first sheet body, a second sheet body and a third sheet body, the third sheet body is horizontally arranged at one end of the first sheet body and the second sheet body in the length direction and is connected with the first sheet body and the second sheet body, the first sheet body and the second sheet body extend along the length direction, can be suitable for ultrasonic welding of a battery core with wider tabs, the third sheet body, the first sheet body and the second sheet body have a certain height difference in the vertical direction, when the tab is ultrasonically welded on the first sheet body and the second sheet body, the high-frequency vibration generated by welding can be buffered or weakened through the joint of the first sheet body, the second sheet body and the third sheet body, the deformation influence on the surface of the third sheet body is reduced, and the surface of the third sheet body is ensured to be flat, further, when the ultrasonic welding of the wide-lug battery cell and the connecting sheet is realized, the problem of insufficient welding or desoldering caused by the laser welding of the pole and the connecting sheet is reduced;
(2) the arc parts are arranged at the joints of the third sheet body, the first sheet body and the second sheet body, so that the vibration caused by ultrasonic welding can be buffered or weakened at the arc parts, and the deformation influence of the vibration on the surface of the third sheet body is reduced;
(3) the first sheet body and the second sheet body are provided with the cutting seams at equal intervals along the length direction of the arc part, so that the deformation stress of the first sheet body and the second sheet body can be released through the cutting seams in the vibration process, and the influence of the deformation stress on the third sheet body is reduced;
(4) first lamellar body, second lamellar body and third lamellar body integrated into one piece for whole connection piece simple structure, processing are convenient.
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 embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a prior art tab structure;
fig. 2 is a schematic view of a connection plane structure of a connecting sheet and a cell core in the prior art;
FIG. 3 is a schematic perspective view of a lithium battery tab structure disclosed in the present invention;
FIG. 4 is a schematic structural view of a connecting sheet body disclosed in the present invention;
fig. 5 is a schematic structural view of a connection plane between the connection sheet body and the battery cell disclosed by the utility model;
the attached drawings are as follows:
100. an electric core; 110. a tab; 200. a top cover; 210. a pole column; l, connecting sheets; 1. a connecting sheet body; 11. a first sheet body; 12. a second sheet body; 13. a third sheet body; 14. an arc portion; 15. and (6) cutting.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, belong to the protection scope of the present invention.
As shown in fig. 1-2, the conventional connecting plate structure in the prior art is generally configured as a U-shaped sheet structure, two tails of the connecting plate are respectively ultrasonically welded to the tab 110 of the battery cell 100, and the head of the connecting plate L is laser-welded to the terminal 210, and the conventional connecting plate L structure is suitable for ultrasonic welding of a narrower winding core of the tab 110, such a tab 110 can be directly welded to the tail of the connecting plate, and because the ultrasonic welding area is small, the head of the L part of the connecting plate cannot be deformed, thereby the laser welding of the connecting plate L and the terminal 210 cannot be affected.
When the tab 110 of the battery cell 100 is designed to be wide, if the connecting piece L is welded according to the conventional structure, the effective welding length is obviously insufficient, and the overcurrent capacity of the tab 110 is insufficient. The conventional method is that the connecting sheet L is still designed into a U-shaped sheet structure, the tail part of the connecting sheet L is lengthened to adapt to ultrasonic welding with the wide pole lug 110, but the head part of the connecting sheet L is inevitably deformed due to large-area welding of the pole lug 110 and the tail part of the connecting sheet L, the surface of the position is uneven, and when the pole 210 and the head part of the connecting sheet L are subjected to laser welding, insufficient welding or desoldering can be caused.
In order to solve the above technical problem, the present embodiment provides a connecting sheet structure for welding a tab 110 to a battery cell 100, which is particularly suitable for a square aluminum-shell lithium battery.
Specifically, as shown in fig. 3 and with reference to fig. 4-5, an embodiment of the present invention discloses a connecting sheet structure for a lithium battery, including a connecting sheet body 1, a top cover 200 and a battery cell 100, where the top cover 200 is used to integrate a terminal 210, a liquid injection hole, and the like, and is of a conventional design structure, and a positive and negative wide tab 110 is formed at one end of the battery cell 100, and the connecting sheet body 1 of this embodiment can connect two battery cells 100 in parallel.
The connecting sheet body 1 comprises a first sheet body 11, a second sheet body 12 and a third sheet body 13, the sheet bodies are sheet-shaped, the thickness is 0.5mm-2mm, the sheet bodies are selected and matched according to actual needs, and in order to meet the conductive requirements, the sheet bodies are made of conductive metal materials.
The first sheet body 11 and the second sheet body 12 are arranged in parallel at intervals on the same horizontal plane, a third sheet body 13 is horizontally arranged between one ends of the first sheet body 11 and the second sheet body 12, two edges of the third sheet body 13 are respectively connected with the edges of the first sheet body 11 and the second sheet body 12, the other ends of the first sheet body 11 and the second sheet body 12 extend along the length direction, therefore, the first sheet body 11, the second sheet body 12 and the third sheet body 13 are connected with each other to form a whole body, which has stable structure and electric conductivity, in assembly, the two battery cells 100 are horizontally placed, the tabs 110 correspond to each other, the positive tab 110 of one of the battery cells 100 is attached to the first sheet 11, the positive electrode tab 110 of another battery cell 100 is attached to the second sheet body 12, and ultrasonic welding is performed, and then another outer connecting piece body 1 is taken to be welded with the negative pole tab 110 of the battery cell 100 by the same method.
Because the tab 110 of the battery cell 100 is wide, the tab 110, the first sheet 11 and the second sheet 12 are welded by ultrasonic, the welding area is large, high-frequency vibration can be generated, the conventional connecting sheet, the third sheet 13, the first sheet 11 and the second sheet 12 are an integral plane, therefore, the high-frequency vibration generated during ultrasonic welding of the first sheet 11 and the second sheet 12 can be transmitted to the third sheet 13, which causes deformation of the third sheet 13, because the third sheet 13 is located between the first sheet 11 and the second sheet 12, laser welding needs to be performed with the pole 210 on the top cover 200, and because the bottom surface of the pole 210 is a flat surface, when the surface of the third sheet 13 is uneven, after laser welding of the pole 210 and the third sheet 13, pseudo welding or even desoldering can be generated, which causes poor battery contact.
Therefore, the scheme adopted by the embodiment is as follows: third lamellar body 13 and first lamellar body 11 and second lamellar body 12 have certain difference in height in vertical direction for when utmost point ear 110 carries out ultrasonic bonding on first lamellar body 11 and second lamellar body 12, the produced high frequency vibrations of welding can be through first lamellar body 11, second lamellar body 12 can cushion or weaken with third lamellar body 13 handing-over department, the reduction causes deformation influence to third lamellar body 13 surface, guarantee third lamellar body 13 surfacing, and then when realizing wide utmost point ear 110 electric core 100 and connection piece ultrasonic bonding, reduce utmost point ear 210 and connection piece laser welding appear rosin joint or the desolder problem.
As some preferred embodiments, the areas of the first sheet body 11 and the second sheet body 12 are equal, so that the current capacity of the tab 110 on the first sheet body 11 and the second sheet body 12 is equal. The area of the first sheet body 11 and the area of the tab 110 on the battery cell 100 are greater than or equal to the area of the tab 110 on the battery cell 100, so that the tab 110 can be completely attached to the first sheet body 11 or the second sheet body 12, and the sufficient overcurrent capacity of the tab 110 can be ensured on the premise of realizing the welding stability.
As some preferred embodiments, the area of the third sheet 13 is greater than or equal to the area of the pole 210, so as to ensure that the bottom surface of the pole 210 is sufficiently welded to the third sheet 13, and the area of the third sheet 13 is smaller than the areas of the first sheet 11 and the second sheet 12, so as to avoid the deformation influence on the larger area of the third sheet 13 caused by the vibration during the ultrasonic welding of the first sheet 11 and the second sheet 12 due to the excessively large area of the third sheet 13.
In some preferred embodiments, the height difference of the third sheet 13 from the first sheet 11 and the second sheet 12 in the vertical direction is 1mm to 5 mm. Above-mentioned size sets up, can reduce under 13 deformation premises of third lamellar body in the assurance, avoids causing whole connection piece body 1 unstable structure because of the difference in height data is great, also can influence top cap 200's installation simultaneously.
In some preferred embodiments, the circular arc portions 14 are arranged at the joints of the third sheet body 13, the first sheet body 11 and the second sheet body 12. With the arrangement, vibration caused by ultrasonic welding can be buffered or weakened at the arc part 14, and the deformation influence of the vibration on the surface of the third sheet body 13 is reduced.
As some preferred embodiments, the arc portion 14 is provided with a plurality of slits 15 at equal intervals along the length direction thereof, so that the deformation stress of the first sheet body 11 and the second sheet body 12 can be released through the slits 15 during the vibration process, and the influence of the deformation stress on the third sheet body 13 can be reduced. In the present embodiment, the size of the slits 15 is preferably 1mm to 5 mm.
As some preferred embodiments, the pole 210 is laser welded to the front or back surface of the third sheet 13. It should be noted that the front surface of the third sheet 13 is a surface of the third sheet 13 that is recessed downward relative to the first sheet 11 and the second sheet 12, and the back surface of the third sheet 13 is a surface of the third sheet 13 that is raised upward relative to the first sheet 11 and the second sheet 12, according to the length of the terminal 210, laser welding of the terminal 210 and the front surface or the back surface of the third sheet 13 is selectively performed, when the size of the terminal 210 is long, laser welding of the terminal 210 and the front surface of the third sheet 13 is possible, and when the size of the terminal 210 is short, laser welding of the terminal 210 and the back surface of the third sheet 13 is possible, and the above-mentioned welding method does not affect ultrasonic welding of the terminal 110 and the first sheet 11 and the second sheet 12.
In a preferred embodiment, the first sheet 11, the second sheet 12 and the third sheet 13 are integrally formed. From this setting for whole connection piece simple structure, processing are convenient, particularly, whole connection piece body 1 can adopt the stamping forming mode to realize.
The embodiment further discloses a lithium battery, which comprises the lithium battery connecting sheet structure and a shell, wherein the shell is used for installing the battery core 100 and the top cover 200. After two battery cores 100 are subjected to ultrasonic welding through the connecting sheet body 1, the battery cores 100 are installed in the casing, then the pole 210 on the top cover 200 is subjected to laser welding with the connecting sheet body 1, and finally the top cover 200 is installed on the top of the casing, so that the whole lithium battery is installed.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a lithium cell connection piece structure, includes connection piece body (1), top cap (200) and electric core (100), its characterized in that: the connecting piece body (1) comprises a first piece body (11), a second piece body (12) and a third piece body (13), the first piece body (11) and the second piece body are horizontally arranged at intervals, the third piece body (13) is horizontally arranged between one ends of the first piece body (11) and the second piece body (12), two edges of the third piece body (13) are respectively connected with the edges of the first piece body (11) and the second piece body (12), a certain height difference exists between the third piece body (13) and the first piece body (11) and the second piece body (12) in the vertical direction, the other ends of the first piece body (11) and the second piece body (12) extend along the length direction, the first piece body (11) and the second piece body (12) are respectively subjected to ultrasonic welding with a lug (110) on an electric core (100), and the third piece body (13) and a laser welding pole (210) on a top cover (200) are welded.
2. The lithium battery tab structure of claim 1, wherein: the area of the first sheet body (11) is equal to that of the second sheet body (12), and the area of the first sheet body (11) and the area of the second sheet body (12) are larger than or equal to that of a tab (110) on the battery cell (100).
3. The lithium battery tab structure of claim 2, wherein: the area of the third sheet body (13) is larger than or equal to that of the pole column (210), and the area of the third sheet body (13) is smaller than that of the first sheet body (11) and that of the second sheet body (12).
4. The lithium battery tab structure of claim 3, wherein: the height difference of the third sheet body (13), the first sheet body (11) and the second sheet body (12) in the vertical direction is 1mm-5 mm.
5. The lithium battery tab structure of claim 1, wherein: the third sheet body (13) is provided with circular arc parts (14) at the joints of the first sheet body (11) and the second sheet body (12).
6. The lithium battery tab structure of claim 5, wherein: the arc part (14) is provided with a plurality of cutting slits (15) at equal intervals along the length direction.
7. The lithium battery tab structure of claim 4, wherein: the pole (210) is welded with the front or the back of the third sheet body (13) in a laser mode.
8. The lithium battery tab structure of claim 1, wherein: the first sheet body (11), the second sheet body (12) and the third sheet body (13) are integrally formed.
9. A lithium battery comprising the lithium battery tab structure of any one of claims 1-8, wherein: the battery cell structure also comprises a shell, and the shell is used for installing the battery cell (100) and the top cover (200).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220870538.8U CN217035905U (en) | 2022-04-14 | 2022-04-14 | Lithium battery connecting sheet structure and lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220870538.8U CN217035905U (en) | 2022-04-14 | 2022-04-14 | Lithium battery connecting sheet structure and lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217035905U true CN217035905U (en) | 2022-07-22 |
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ID=82416520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220870538.8U Active CN217035905U (en) | 2022-04-14 | 2022-04-14 | Lithium battery connecting sheet structure and lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217035905U (en) |
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2022
- 2022-04-14 CN CN202220870538.8U patent/CN217035905U/en active Active
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