CN220272580U - Three-electrode system soft-package battery - Google Patents
Three-electrode system soft-package battery Download PDFInfo
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- CN220272580U CN220272580U CN202321749005.5U CN202321749005U CN220272580U CN 220272580 U CN220272580 U CN 220272580U CN 202321749005 U CN202321749005 U CN 202321749005U CN 220272580 U CN220272580 U CN 220272580U
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- electrode
- negative
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- positive
- tab
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- 238000003466 welding Methods 0.000 claims description 14
- 229910052744 lithium Inorganic materials 0.000 abstract description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000012797 qualification Methods 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
Abstract
The utility model relates to the technical field of lithium battery manufacturing, in particular to a three-electrode system soft-package battery. The battery cell comprises a stacked positive plate, a stacked negative plate and a reference electrode, wherein a diaphragm is arranged between the positive plate and the negative plate, the reference electrode is arranged between the diaphragms, and two ends of the reference electrode are fixedly connected with the electrode lugs and the housing respectively. The position of the reference electrode in the battery can be effectively fixed, the contact short circuit between the reference electrode and the anode is prevented, the influence of the addition of the reference electrode on the battery test is reduced, and the qualification rate of the battery is improved.
Description
Technical Field
The utility model relates to the technical field of lithium battery manufacturing, in particular to a three-electrode system soft-package battery.
Background
The lithium battery has the characteristics of high energy density, small volume, convenient and quick use, lower environmental impact, recycling, and the like, and is widely applied to the fields of portable electronic equipment, electric vehicles, energy storage systems and the like. With the development of technology and the improvement of living standard, the requirements of consumers on the safety performance, the energy density and the high-power charging performance of lithium ion batteries are higher and higher, and the research work of researchers on the problems of battery research materials, performance, safety and the like is more and deeper.
Wherein a three-electrode cell can achieve a more accurate chemical reaction, the three-electrode cell comprising three electrodes: the structure of the battery allows the reference electrode to be introduced between the positive electrode and the negative electrode, thereby increasing the functions and performances of the battery, wherein the positive electrode is an oxidant in the battery, the negative electrode is a reducing agent, and the reference electrode provides a stable potential reference for controlling the potential difference between the positive electrode and the negative electrode, and improving the energy conversion efficiency; the three-electrode battery can work in a wider voltage range due to the existence of the reference electrode, and unstable reaction in the battery can be reduced due to the fact that the reference electrode provides a potential reference, the electrochemical stability of the battery is improved, and the output of the battery is more stable and controllable. Three-electrode cells are widely used in the fields of fuel cells, sensors, electrochemical analysis, etc., which improve the performance and function of the cell by introducing a reference electrode, thereby meeting the more complex and accurate electrochemical demands.
Patent CN 102044699A provides a method for manufacturing a polymer lithium ion battery suitable for a reference electrode. The method comprises the following experimental steps: the battery pole group consists of a positive pole piece, a negative pole piece, an insulating diaphragm and a positive pole lug and a negative pole lug; the reference electrode consists of a lithium sheet, a negative electrode lug and a small insulating diaphragm; the electrode group is in a regular square shape, the positive and negative lugs are positioned on one side or the opposite sides of the electrode group, and the reference electrode is positioned between two layers of diaphragms in the electrode group; and taking the winding core as a shaft, and adopting full-automatic winding to obtain the final pole group. Under the drying condition, the lithium sheet is coated on the other negative electrode lug in a rolling way; the lithium sheet is fixed on the metal negative electrode lug by rolling, and the diaphragm is coated on the lithium sheet by adopting adhesive tape or glue solution with bonding effect. According to the patent method, lithium metal pressed on the tab is easy to fall off only through physical and mechanical pressing, and in the manufacturing and using processes, the copper wire is easy to move, so that the copper wire is in short circuit contact with the anode or the cathode, and the reference electrode is invalid.
Disclosure of Invention
Based on the defects in the background technology, aiming at the problem that the battery test is influenced by short circuit caused by poor fixation of a reference electrode of the traditional three-electrode battery, the utility model aims to provide the three-electrode system soft-package battery which can effectively position the reference electrode and improve the qualification rate of the battery.
In order to achieve the above purpose, the present utility model is realized by the following technical scheme:
the utility model provides a three electrode system soft package battery, includes electric core and casing, the electric core includes positive plate, negative pole piece and the reference electrode of piling up, all be equipped with the diaphragm between positive plate, the negative pole piece, the reference electrode is located between the diaphragm, the both ends of reference electrode respectively with utmost point ear, casing fixed connection.
The shell is made of an aluminum plastic film and is used for covering the battery cell; the reference electrode can be selected as the copper wire soaked by acid, the copper wire is pulled out from two ends to obtain two welding points, and when the welding defect of the tab occurs at one end, the welding at the other end can be remedied, so that the direct scrapping of the battery is avoided, and the quality of the three-electrode battery is improved.
As a further improvement of the utility model, the length of the reference electrode is greater than the height of the housing.
As a further improvement of the utility model, the number of the positive plates and the negative plates is multiple, and the battery cell comprises a plurality of groups of positive plates and negative plates which are arranged in a staggered manner.
As a further improvement of the utility model, the number of the reference electrodes is one, and the reference electrodes are arranged between one group of positive plates and one group of negative plates.
As a further improvement of the utility model, the two sides of the reference electrode are provided with diaphragms, and the number of the diaphragms arranged between the positive pole pieces and the negative pole pieces of the rest groups is one.
1 to 2 diaphragms are arranged between the adjacent positive plate and the negative plate, and when a reference electrode is arranged, the reference electrode is arranged between the two diaphragms; when no reference electrode exists, 1 diaphragm is arranged between the positive electrode and the negative electrode.
As a further improvement of the utility model, the tab comprises a positive tab and a negative tab, and the positive tab and the negative tab are respectively welded with the top ends of the positive plate and the negative plate.
As a further improvement of the utility model, the upper end of the reference electrode is welded with the negative electrode ear.
As a further improvement of the utility model, the lower end of the reference electrode protrudes out of the housing and is fixed outside the housing.
As a further improvement of the utility model, the welding parts are adhered with insulating tapes.
After the positive plate and the negative plate of the battery cell are overlapped in a staggered way, the top ends of the positive plate and the negative plate are respectively welded with a positive lug and a negative lug, one end of the reference electrode, the copper foil and the negative lug are welded together, and then the insulating PP is glued at the welding positions of all the positive and negative lugs, and the position of the reference electrode is fixed at the same time.
As a further improvement of the utility model, the housing comprises an upper sealing edge, a lower sealing edge and a side sealing edge.
The packaging sequence of the upper sealing edge, the lower sealing edge and the side sealing edge of the shell is an important ring in the preparation of the three-electrode system soft-package battery, the battery cell is placed in a groove of the shell after the battery cell is punched, the shell is folded and unfolded to the right to wrap the battery cell, the upper sealing edge is packaged firstly, then the lower sealing edge is packaged under the state that the reference electrode is kept to be stretched, and the redundant reference electrode is fixed outside the shell by using an adhesive tape.
Therefore, the utility model has the beneficial effects that:
(1) The three-electrode system soft-package battery provided by the utility model can effectively fix the position of the reference electrode in the battery, prevent the contact short circuit between the reference electrode and the anode and the cathode, and reduce the influence of the addition of the reference electrode on the battery test;
(2) The copper wires are pulled out from the two ends to obtain two welding points, and when one end of the three-electrode battery is poor in welding, the welding of the other end of the three-electrode battery can be remedied, so that the direct scrapping of the battery is avoided, and the quality of the three-electrode battery is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some of the embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a battery cell according to the present embodiment;
fig. 2 is a schematic structural view of the soft pack battery of the present embodiment;
fig. 3 is a schematic diagram of the package of the soft package battery according to the present embodiment;
reference numerals illustrate, wherein:
the battery cell 1, the shell 2, the positive plate 1-1, the negative plate 1-2, the reference electrode 1-3, the diaphragm 1-4, the positive lug 1-5, the negative lug 1-6, the insulating tape 3, the upper edge banding 2-1, the lower edge banding 2-2, the side edge banding 2-3, the first side edge banding 2-31 and the second side edge banding 2-32.
Detailed Description
The technical solutions of the embodiments of the present utility model will be explained and illustrated below with reference to the drawings of the embodiments of the present utility model, but the following embodiments are only preferred embodiments of the present utility model, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present utility model.
In the following description, directional or positional relationships such as the terms "inner", "outer", "upper", "lower", "left", "right", etc., are presented for convenience in describing the embodiments and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.
The embodiment provides a three-electrode system soft-package battery, referring to fig. 1 and combining fig. 2, comprising a battery cell 1 and a shell 2, wherein the battery cell 1 comprises a positive plate 1-1, a negative plate 1-2 and a reference electrode 1-3 which are stacked, a diaphragm 1-4 is arranged between the positive plate 1-1 and the negative plate 1-2, the reference electrode 1-3 is arranged between the diaphragms 1-4, and two ends of the reference electrode 1-3 are fixedly connected with a tab and the shell 2 respectively.
The shell 2 is made of an aluminum plastic film and is used for covering the battery cell 1; the reference electrode 1-3 can be selected as the copper wire soaked by acid, the copper wire is pulled out from the two ends to obtain two welding points, and when the welding defect of the tab occurs at one end, the welding at the other end can be remedied, so that the direct scrapping of the battery is avoided, and the quality of the three-electrode battery is improved.
It should be noted that the length of the reference electrode 1-3 is longer than the height of the housing 2, so that the reference electrode 1-3 may protrude from both ends of the housing.
The number of the positive electrode plates 1-1 and the negative electrode plates 1-2 is multiple, and the battery cell 1 is formed by stacking multiple groups of positive electrode plates 1-1 and negative electrode plates 1-2 which are arranged in a staggered manner. The number of the reference electrodes 1-3 is one, and the reference electrodes 1-3 are arranged between one group of positive plates 1-1 and negative plates 1-2.
The two sides of the reference electrode 1-3 are respectively provided with a diaphragm 1-4, and the number of the diaphragms 1-4 arranged between the positive electrode plate 1-1 and the negative electrode plate 1-2 in the other groups is one. Namely, 1 to 2 diaphragms are arranged between the adjacent positive plate 1-1 and the negative plate 1-2, and when the reference electrode 1-3 is arranged, the reference electrode is positioned between the two diaphragms 1-4; when no reference electrode 1-3 is provided, 1 diaphragm is arranged between the positive electrode and the negative electrode.
As shown in fig. 1 and 2, the tab includes a positive tab 1-5 and a negative tab 1-6, and the positive tab 1-5 and the negative tab 1-6 are welded with the top ends of the positive tab 1-1 and the negative tab 1-2 respectively.
The upper end of the reference electrode 1-3 is welded with the negative electrode lug 1-6, and the lower end of the reference electrode 1-3 protrudes out of the shell 2 and is fixed outside the shell 2. Insulating tapes 3 are adhered to the welding positions of the electrode lugs.
Referring to fig. 3, the preparation method of the three-electrode system soft-pack battery provided in this embodiment specifically includes the following steps:
after the positive plate 1-1 and the negative plate 1-2 of the battery cell 1 are overlapped in a staggered way, the top ends of the positive plate 1-1 and the negative plate 1-2 are respectively welded with the positive lug 1-5 and the negative lug 1-6, one end of the reference electrode 1-3, the copper foil and the negative lug 1-6 are welded together, and then the insulating PP is glued at the welding positions of all the positive and negative lugs, and the position of the reference electrode 1-3 is fixed at the same time. The battery cell 1 is placed in a groove of the shell 2 after pit punching, the left shell is turned to the right to wrap the battery cell 1, the upper sealing edge 2-1 is firstly sealed, then the sealing edge 2-2 is sealed under the state that the reference electrode 1-3 is kept to be stretched, and the redundant reference electrode 1-3 is fixed outside the shell 2 by using an adhesive tape. Electrolyte is injected into the opening on the right side of the shell 2 after the battery cell 1 is baked, and then the first side edge sealing 2-31 is packaged. And after the battery cell is formed and charged, packaging the second side edge sealing 2-32, and cutting off redundant shells in the air bag. And finally, carrying out low-current lithium charging between the positive electrode 1-1 and the reference electrode 1-3 to finish the preparation of the three-electrode system soft package battery.
While the utility model has been described in terms of embodiments, it will be appreciated by those skilled in the art that the utility model is not limited thereto but rather includes the drawings and the description of the embodiments above. Any modifications which do not depart from the functional and structural principles of the present utility model are intended to be included within the scope of the appended claims.
Claims (10)
1. The utility model provides a three electrode system soft package battery, includes electric core (1) and casing (2), its characterized in that, electric core (1) are including positive pole piece (1-1), negative pole piece (1-2) and reference electrode (1-3) of piling up, all be equipped with diaphragm (1-4) between positive pole piece, the negative pole piece, reference electrode (1-3) are located between diaphragm (1-4), the both ends of reference electrode (1-3) are with utmost point ear, casing (2) fixed connection respectively.
2. A three electrode system pouch cell according to claim 1, wherein the length of the reference electrode (1-3) is greater than the height of the housing (2).
3. The three-electrode system soft package battery according to claim 1, wherein the number of the positive electrode plates (1-1) and the negative electrode plates (1-2) is plural, and the battery cell (1) comprises a plurality of groups of positive electrode plates (1-1) and negative electrode plates (1-2) which are arranged in a staggered manner.
4. A three-electrode system soft-pack battery according to claim 3, wherein the number of the reference electrodes (1-3) is one, and the reference electrodes are arranged between one group of positive electrode plates (1-1) and negative electrode plates (1-2).
5. A three-electrode system soft-pack battery according to claim 3, characterized in that the two sides of the reference electrode (1-3) are provided with diaphragms (1-4), and the number of diaphragms (1-4) arranged between the positive electrode plates (1-1) and the negative electrode plates (1-2) of the rest groups is one.
6. The three-electrode system soft-pack battery according to claim 1, wherein the tab comprises a positive tab (1-5) and a negative tab (1-6), and the positive tab and the negative tab are welded with the top ends of the positive tab (1-1) and the negative tab (1-2) respectively.
7. The three-electrode system flexible battery according to claim 6, wherein the upper end of the reference electrode (1-3) is welded to the negative electrode tab (1-6).
8. The three-electrode system pouch cell according to claim 7, wherein the lower end of the reference electrode (1-3) protrudes out of the case (2) and is fixed to the outside of the case.
9. The three-electrode system soft package battery according to claim 7, wherein the welding parts of the tabs are adhered with insulating tapes (3).
10. A three electrode system pouch cell according to claim 1, wherein the casing (2) comprises an upper edge seal (2-1), a lower edge seal (2-2) and a side edge seal (2-3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321749005.5U CN220272580U (en) | 2023-07-05 | 2023-07-05 | Three-electrode system soft-package battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321749005.5U CN220272580U (en) | 2023-07-05 | 2023-07-05 | Three-electrode system soft-package battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220272580U true CN220272580U (en) | 2023-12-29 |
Family
ID=89302883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321749005.5U Active CN220272580U (en) | 2023-07-05 | 2023-07-05 | Three-electrode system soft-package battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220272580U (en) |
-
2023
- 2023-07-05 CN CN202321749005.5U patent/CN220272580U/en active Active
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| GR01 | Patent grant |