CN114628860A - Pole piece and tab welding structure of lithium ion battery - Google Patents
Pole piece and tab welding structure of lithium ion battery Download PDFInfo
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- CN114628860A CN114628860A CN202111571532.7A CN202111571532A CN114628860A CN 114628860 A CN114628860 A CN 114628860A CN 202111571532 A CN202111571532 A CN 202111571532A CN 114628860 A CN114628860 A CN 114628860A
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- tab
- positive
- foil
- negative
- edge
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- 238000003466 welding Methods 0.000 title claims abstract description 42
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 12
- 239000011888 foil Substances 0.000 claims abstract description 176
- 125000006850 spacer group Chemical group 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 2
- 229910052744 lithium Inorganic materials 0.000 abstract description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 4
- 238000013016 damping Methods 0.000 description 12
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 150000002641 lithium Chemical class 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
A pole piece and pole lug welding structure of a lithium ion battery comprises a positive pole piece, a negative pole piece, a positive pole lug, a negative pole lug and a spacer. The front side of the positive plate main body is provided with a positive plate foil, and the rear side of the negative plate is provided with a negative tab foil. The positive plate foils comprise edge positive plate foils welded together to form an edge positive plate foil group and secondary edge positive plate foils welded together to form a secondary edge positive plate foil group. The positive tab is composed of a side positive tab, a secondary side positive tab and a middle positive tab, and the middle positive tab is provided with a positive tab main tab. The negative tab foil comprises edge negative tab foils welded together to form an edge negative tab foil group and secondary edge negative tab foils welded together to form a secondary edge negative tab foil group. The negative pole lug is composed of a side negative pole lug, a secondary side negative pole lug and a middle negative pole lug, and the middle negative pole lug is provided with a negative pole lug main lug. The invention has novel structure and can well improve the welding yield of the lithium battery pole piece foil and the pole lug.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a pole piece and tab welding structure of a lithium ion battery.
Background
In the structure of a traditional lithium ion battery, a tab (comprising a positive tab and a negative tab) of the lithium battery and a pole piece (comprising a positive pole piece and a negative pole piece) are fixedly connected at the same position. The welding mode of the pole piece and the pole lug is generally divided into two steps: firstly, preliminarily welding all the superposed pole piece foils by an ultrasonic welding device to realize the preliminary combination of the pole piece foils; and secondly, firmly welding the preliminarily combined pole piece foil and the metal lug of the battery cell by the ultrasonic welding device again.
The invention patent with the name of 'a welding structure of a lithium battery pole piece foil and a tab' with the application number of 201310686635.7 and the publication number of CN 104638223B discloses a welding structure of a lithium battery pole piece and a tab: the electrode comprises an electrode formed by overlapping a plurality of pole piece foils, the electrode comprises a positive electrode and a negative electrode, and the pole piece foils are connected in a welding manner, and the electrode is characterized in that a pole lug is welded on one side of the electrode, pole lug glue is arranged at the upper end of the pole lug, a damping sheet is arranged on the other side of the electrode, a damping cavity is arranged on the inner side of the damping sheet, high-temperature-resistant glue is filled in the damping cavity, the periphery of the damping sheet extends outwards to form an annular welding surface, the annular welding surface is of a zigzag structure, and the annular welding surface is connected with the electrode in a welding manner; the bottom of the damping cavity is provided with a through hole; the damping cavity is internally provided with a parting strip, the parting strip divides the damping cavity into an upper damping cavity and a lower damping cavity, the bottoms of the upper damping cavity and the lower damping cavity are respectively provided with a through hole, and the end part of the parting strip is in contact with the electrode in a laminating manner. However, the connection structure of the pole piece and the pole lug is the same as that of other lithium batteries, the relative positions of the pole pieces and the pole lugs on different layers are the same, the welding process requires relatively high ultrasonic welding energy, the problems of damage and breakage of pole piece foils or sticking of a welding head base caused by overlarge ultrasonic energy are easily caused, and whether the welding between the pole piece foils and the pole lugs is abnormal or not is not easy to find out, so that the welding yield is directly influenced finally.
Disclosure of Invention
The invention mainly aims to provide a pole piece and tab welding structure of a lithium ion battery, which can improve the welding yield of lithium battery pole piece foils and tabs.
The technical scheme adopted by the invention is as follows: a pole piece and tab welding structure of a lithium ion battery comprises a positive pole piece, a negative pole piece, a positive pole tab, a negative pole tab and a spacer. The front side of the positive plate main body extends forwards to form a positive plate foil piece used for being welded with the positive lug, and the rear side of the negative plate extends backwards to form a negative lug foil piece used for being welded with the negative lug. The positive plate foils comprise side positive plate foils and secondary side positive plate foils, the side positive plate foils are vertically aligned and welded together to form side positive plate foil groups, and the secondary side positive plate foils are vertically aligned and welded together to form secondary side positive plate foil groups. The distance between the right edge of the edge positive plate foil group and the left edge of the edge negative plate foil group is more than or equal to 5 mm. The corresponding positive lug is composed of an edge positive lug welded with the edge positive plate foil group, a secondary edge positive lug welded with the secondary edge positive plate foil group, and a middle positive lug, the left end and the right end of which are respectively connected with the edge positive lug and the secondary edge positive lug into a whole, and the middle positive lug is provided with a positive lug main lug. Accordingly, the number of the first and second electrodes,
the negative electrode tab foil comprises edge negative electrode tab foils and secondary negative electrode tab foils, the edge negative electrode tab foils are vertically aligned and welded together to form an edge negative electrode tab foil group, and the secondary negative electrode tab foils are vertically aligned and welded together to form a secondary negative electrode tab foil group. The distance between the right edge of the edge negative plate foil cluster and the left edge of the edge negative plate foil cluster is more than or equal to 5 mm. The corresponding negative electrode lug consists of a side negative electrode lug welded with the side negative electrode sheet foil cluster, a secondary negative electrode lug welded with the secondary negative electrode sheet foil cluster, and a middle negative electrode lug, the left end and the right end of which are respectively connected with the side negative electrode lug and the secondary negative electrode lug, and the middle negative electrode lug is provided with a negative electrode lug main lug.
The positive plate foil of the positive plate is divided into an edge positive plate foil closer to the left edge of the positive plate and a secondary edge positive plate foil farther from the left edge, and the corresponding positive lug for welding with the positive plate foil is an integral structure formed by connecting the edge positive lug welded with the edge positive plate foil, the secondary edge positive lug welded with the secondary edge positive plate and the middle positive lug. Similarly, the negative pole piece foil of the negative pole piece is divided into an edge negative pole piece foil closer to the left edge of the negative pole piece and a secondary negative pole piece foil farther away from the left edge, the corresponding negative pole lug for welding with the negative pole piece foil is an integral structure formed by connecting the edge negative pole lug welded with the edge negative pole piece foil, the secondary negative pole lug welded with the secondary negative pole piece foil and the middle negative pole lug, thereby reducing the ultrasonic energy required by the ultrasonic welding operation of welding the positive plate foil and the positive tab and the negative tab foil and the negative tab together, therefore, the conventional method that all the positive plate foils are welded together and all the negative plate foils are welded together to be led is changed, the pole piece foil which is easy to bring because of the larger ultrasonic energy is easy to be damaged and broken or stick to the base of the welding head because of the overlarge ultrasonic energy, thereby being beneficial to ensuring the welding yield.
Preferably, a secondary positive plate foil is sandwiched between two adjacent secondary positive plate foils, and a positive plate foil is sandwiched between two adjacent secondary positive plate foils. Correspondingly, a secondary negative plate foil is sandwiched between two adjacent secondary negative plate foils, and a side positive and negative plate foil is sandwiched between the two adjacent secondary negative plate foils. More preferably, the main lug of the positive lug is arranged at the middle position of the middle positive lug; in the same way, the main lug of the negative pole lug is arranged at the middle position of the middle negative pole lug. The distance between the right edge of the edge positive plate foil and the left edge of the secondary edge positive plate foil is more than or equal to 10 mm; correspondingly, the distance between the right edge of the side negative plate foil and the left edge of the secondary negative plate foil is more than or equal to 10 mm. The widths of the edge positive plate foil and the secondary edge positive plate foil are equal to each other and are less than or equal to the distance between the right edge of the edge positive plate foil and the left edge of the secondary edge positive plate foil. These preferred schemes, rational in infrastructure are favorable to further improving the welding yield.
In summary, the invention divides the positive plate foil into the edge positive plate foil and the secondary edge positive plate foil at different positions, divides the negative plate foil into the edge negative plate foil and the secondary edge negative plate foil, and then obtains the edge positive plate foil group, the secondary edge positive plate foil group, the edge negative plate foil group and the secondary edge negative plate foil group through corresponding ultrasonic welding operation, and then the edge positive plate foil group, the secondary edge positive plate foil group, the edge negative plate foil group and the secondary edge negative plate foil group are welded with the positive tab and the negative tab with corresponding structures, thus greatly reducing ultrasonic energy required by relevant welding operation, solving the problem that the relevant plate foil is broken or stuck to the base of the welding head due to overlarge ultrasonic energy, and being beneficial to ensuring relevant welding yield.
Drawings
FIG. 1: the invention discloses a schematic diagram of a connection structure of a positive plate and a negative plate;
FIG. 2: the positive tab and the positive plate foil are connected with each other;
in the figure: positive plate 1, positive plate foil 11, side positive plate foil 11.1, secondary side positive plate foil 11.2, side positive plate foil group 12, secondary side positive plate foil group 13, negative plate 2, positive tab 3, side positive tab 31, secondary side positive tab 32, middle positive tab 33 and positive tab main tab 33.1.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
As shown in fig. 1 and fig. 2 (left, right, front, back and forth are described according to the orientations shown in fig. 1), the invention comprises a positive plate 1, a negative plate 2, a positive tab 3, a negative tab and a spacer (not shown in detail in the figures). The front side of the body of the positive plate 1 extends forwards to form a positive plate foil 11 for welding with the positive lug 3, and the rear side of the body of the negative plate 2 extends backwards to form a negative lug foil for welding with the negative lug. Wherein the body of the positive plate 1, the body of the negative plate 2 and the separator are arranged and connected in a known manner.
The positive plate foil 11 comprises an edge positive plate foil 11.1 and a secondary positive plate foil 11.2, wherein the widths of the edge positive plate foil 11.1, the secondary positive plate foil 11.1 and the secondary positive plate foil 11.2 are equal and smaller than the distance between the right edge of the edge positive plate foil 11.1 and the left edge of the secondary positive plate foil 11.2. The foil pieces 11.1 of the positive plates on the sides are vertically aligned and welded together to form a foil group 12 of the positive plates on the sides, and the foil pieces 11.2 of the positive plates on the secondary sides are vertically aligned and welded together to form a foil group 13 of the positive plates on the secondary sides. The distance between the right edge of the edge positive plate foil group 12 and the left edge of the edge negative plate foil group 13 is equal to 10 mm; the corresponding positive tab 3 is composed of an edge positive tab 31 welded with the edge positive tab foil group 12, a secondary edge positive tab 32 connected with the secondary edge positive tab foil group 13, and a middle positive tab 33 with the left end and the right end respectively connected with the edge positive tab 31 and the secondary edge positive tab 32 into a whole, the middle positive tab 33 is provided with a positive tab main tab 33.1, the positive tab main tab 33.1 is positioned at the middle part of the middle positive tab 33, and the rear end of the positive tab main tab 33.1 is connected with the middle positive tab 33 main body; accordingly, the number of the first and second electrodes,
the negative electrode tab foil comprises edge negative electrode tab foils and secondary negative electrode tab foils, the edge negative electrode tab foils are vertically aligned and welded together to form an edge negative electrode tab foil group, and the secondary negative electrode tab foils are vertically aligned and welded together to form a secondary negative electrode tab foil group. In addition, in a plan view, the edge negative electrode tab foil group and the edge positive electrode tab foil group 12 are symmetrical front to back, and the edge negative electrode tab foil group and the edge positive electrode tab foil group 13 are symmetrical front to back. Corresponding negative pole ear by with the limit negative pole piece that limit negative pole piece foil mass welded even, with the secondary limit negative pole piece that secondary limit negative pole piece foil mass links to each other, control both ends and constitute with the middle negative pole ear that limit negative pole ear and secondary limit negative pole ear link to each other respectively, middle negative pole ear is equipped with negative pole ear owner ear, negative pole ear owner ear establishes the positive position at middle negative pole ear, positive pole ear and negative pole ear fore-and-aft symmetry in the plan view simultaneously.
Preferably, a secondary positive plate foil 11.2 is sandwiched between two adjacent secondary positive plate foils 11.1, and a secondary positive plate foil 11.1 is sandwiched between two adjacent secondary positive plate foils 11.2. Correspondingly, a secondary negative plate foil is sandwiched between two adjacent negative plate foils, and an edge negative plate foil is sandwiched between two adjacent secondary negative plate foils. Here, the secondary positive electrode tab foils 11.2 are all on the right side of the edge positive electrode tab foil 11.1, and the secondary negative electrode tab foils are all on the right side of the edge negative electrode tab foil in plan view.
The above embodiments are merely preferred embodiments of the present invention, and not intended to limit the structure and scope of the invention. Indeed, many equivalent variations in the shapes, constructions and design objectives of the elements described may be made in accordance with the present invention. Therefore, all equivalent changes in the shapes, structures and design objectives of the present invention are intended to be covered by the present invention, and all such equivalent changes are intended to be protected by the present invention.
Claims (4)
1. A pole piece and tab welding structure of a lithium ion battery comprises a positive pole piece (1), a negative pole piece (2), a positive pole tab (3), a negative pole tab and a spacer; a positive plate foil (11) used for being welded with the positive electrode lug (3) extends forwards from the front side of the main body of the positive plate (1), and a negative electrode lug foil used for being welded with the negative electrode lug extends backwards from the rear side of the main body of the negative plate (2); the method is characterized in that:
the positive plate foils (11) comprise side positive plate foils (11.1) and secondary side positive plate foils (11.2), the positions of the side positive plate foils (11.1) are vertically aligned and welded together to form side positive plate foil groups (12), and the positions of the secondary side positive plate foils (11.2) are vertically aligned and welded together to form secondary side positive plate foil groups (13); the distance between the right edge of the edge positive plate foil cluster (12) and the left edge of the next edge positive plate foil cluster (13) is more than or equal to 5 mm; the corresponding positive tab (3) is composed of a side positive tab (31) welded with the side positive tab foil group (12), a secondary side positive tab (32) welded with the secondary side positive tab foil group (13), and a middle positive tab (33) of which the left end and the right end are respectively connected with the side positive tab (31) and the secondary side positive tab (32) into a whole, wherein the middle positive tab (33) is provided with a main positive tab (33.1); accordingly, the number of the first and second switches is increased,
the negative tab foils comprise edge negative tab foils and secondary edge negative tab foils, the edge negative tab foils are vertically aligned and welded together to form edge negative tab foil groups, and the secondary edge negative tab foils are vertically aligned and welded together to form secondary edge negative tab foil groups; the corresponding negative pole lug is composed of a side negative pole lug welded with the side negative pole piece foil mass, a secondary side negative pole lug welded with the secondary side negative pole piece foil mass, and a middle negative pole lug, the left end and the right end of which are respectively connected with the side negative pole lug and the secondary side negative pole lug, and the middle negative pole lug is provided with a negative pole lug main lug.
2. The lithium ion battery pole piece and tab welding structure of claim 1, wherein: a secondary positive plate foil (11.2) is clamped between two adjacent edge positive plate foils (11.1), and an edge positive plate foil (11.1) is clamped between the two adjacent secondary positive plate foils (11.2); correspondingly, a secondary negative electrode foil is sandwiched between two adjacent secondary negative electrode foils, and a secondary negative electrode foil is sandwiched between the two adjacent secondary negative electrode foils.
3. The lithium ion battery pole piece and tab welding structure of claim 1, wherein: the positive lug main lug (33.1) is arranged at the middle position of the middle positive lug (33); in the same way, the main lug of the negative pole lug is arranged at the middle position of the middle negative pole lug.
4. The lithium ion battery pole piece and tab welding structure of claim 1, wherein: the distance between the right edge of the edge positive plate foil (11.1) and the left edge of the next edge positive plate foil (11.2) is more than or equal to 10 mm; correspondingly, the distance between the right edge of the side negative plate foil and the left edge of the secondary negative plate foil is more than or equal to 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111571532.7A CN114628860A (en) | 2021-12-21 | 2021-12-21 | Pole piece and tab welding structure of lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111571532.7A CN114628860A (en) | 2021-12-21 | 2021-12-21 | Pole piece and tab welding structure of lithium ion battery |
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| CN114628860A true CN114628860A (en) | 2022-06-14 |
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| CN202111571532.7A Pending CN114628860A (en) | 2021-12-21 | 2021-12-21 | Pole piece and tab welding structure of lithium ion battery |
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| CN112038650A (en) * | 2020-07-28 | 2020-12-04 | 天津力神电池股份有限公司 | Flexible package lithium fluorocarbon primary battery |
| CN113381132A (en) * | 2021-06-03 | 2021-09-10 | 珠海冠宇电池股份有限公司 | Multi-tab battery core and battery |
| CN113571844A (en) * | 2021-07-14 | 2021-10-29 | 厦门海辰新能源科技有限公司 | Preparation method of current collector assembly, battery monomer and battery pack |
-
2021
- 2021-12-21 CN CN202111571532.7A patent/CN114628860A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201117740Y (en) * | 2007-06-15 | 2008-09-17 | 深圳市邦凯电子有限公司 | Flexible packing multi-lamination structure lithium ion power cell |
| CN201146250Y (en) * | 2007-12-25 | 2008-11-05 | 比亚迪股份有限公司 | Piece for connecting battery module |
| CN203521536U (en) * | 2013-09-11 | 2014-04-02 | 深圳市明电环球科技有限公司 | Novel flexible packaging lithium-ion power battery |
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