Polymer lithium battery
By directly welding the positive electrode and nickel sheet in polymer lithium batteries using laser welding technology, the complex and unreliable welding problem in the prior art is solved, and the process simplification and welding reliability are achieved.
Patent Information
- Application Number
- CN202421171086.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-05-27
AI Technical Summary
Because the positive electrode of the existing polymer lithium battery is aluminum, it is not easy to weld with nickel sheets through ordinary welding methods. The existing process is complex and unreliable.
Using laser welding technology, the positive electrode of the battery cell is directly welded to the nickel sheet. By designing the patch part and extension part of the nickel sheet, the positive electrode of the battery cell is clamped between the two and fixed.
The process flow is simplified, the reliability and safety of welding is improved, the steps of adapting nickel sheets are avoided, and the costs are reduced.
Smart Images
Figure CN222601170U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a polymer lithium battery. Background Art
[0002] A battery cell is the most basic component of a battery, usually an electrochemical device encapsulated in a metal shell. It is a unit that stores and releases electrical energy, converting chemical energy into electrical energy through chemical reactions. A battery cell is usually composed of a positive electrode, a negative electrode, a separator, and an electrolyte.
[0003] The positive and negative electrodes are the two polar ends of the battery cell, separated by a separator. Both the positive and negative electrodes contain active materials, which are usually the site of chemical reactions. The separator is an ion-permeable membrane that prevents direct contact between the positive and negative electrodes, but allows ions to pass between the two electrodes. The electrolyte is a liquid or solid that acts as an ion transport medium, which helps maintain the flow of ions in the battery cell.
[0004] Lithium-ion batteries are composed of cells and protective circuit boards. The battery packaging combines the cells with the protective circuit board through the structure. Polymer lithium batteries are lithium batteries composed of polyester organic polymer compounds embedded with lithium ions. They are a new type of chemical power source with higher energy density and better safety performance than traditional lithium batteries. It uses polymer materials to realize solid electrolytes and positive and negative electrodes, thereby improving the energy density and stability of the battery.
[0005] The polymer lithium battery cell is a very common battery cell, but because its positive electrode is made of aluminum, it is not easy to weld with the nickel sheet using ordinary welding methods. In the prior art, the positive electrode of the polymer battery cell must first be ultrasonically welded to the nickel sheet, and then resistance welded to the nickel sheet through the nickel sheet. This process is complicated and unreliable. Summary of the invention
[0006] Therefore, the purpose of the present invention is to provide a polymer lithium battery, the structure of which is suitable for laser welding of the positive electrode of the battery cell and the nickel sheet.
[0007] To achieve the above-mentioned purpose, the utility model provides a polymer lithium battery, comprising: an upper shell, a bottom shell, a first battery cell, a second battery cell, and a battery cell protection plate; the upper shell is assembled on the bottom shell to form a accommodating space for accommodating the first battery cell, the second battery cell and the battery cell protection plate; the first battery cell and the second battery cell are overlapped up and down, and the battery cell protection plate is erected on one side of the electrodes of the first battery cell and the second battery cell; two upper and lower positive electrode nickel sheets are respectively provided on the battery cell protection plate at positions facing the positive electrodes of the first battery cell and the second battery cell, and two upper and lower negative electrode nickel sheets are respectively provided on the battery cell protection plate at positions facing the negative electrodes of the first battery cell and the second battery cell; the positive electrode nickel sheet comprises an integrated patch portion and an extension portion, the patch portion is tightly fitted and fixed to the battery cell protection plate, and the extension portion extending from the patch portion away from the battery cell protection plate is folded and fitted toward the patch portion to clamp the corresponding battery cell positive electrode between the two and fix them together by laser welding.
[0008] Wherein, the negative electrode nickel sheet is integrally and tightly fitted to the battery cell protection plate.
[0009] The shape and size of the negative electrode nickel sheet match those of the negative electrode.
[0010] Wherein, the negative electrode nickel sheet and the negative electrode are fixed together via laser welding.
[0011] The extension parts of the upper and lower positive nickel sheets are folded in the counterclockwise direction and the clockwise direction respectively to fit the corresponding patch parts.
[0012] In summary, the polymer lithium battery of the utility model does not need to transfer a nickel sheet during production, and the positive electrode of the battery cell is directly welded to the nickel sheet by laser, and the process is simple, reliable and safe. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The following detailed description of the specific implementation of the utility model in conjunction with the accompanying drawings will make the technical solution and other beneficial effects of the utility model obvious.
[0014] Figure 1 This is an exploded schematic diagram of a preferred embodiment of the polymer lithium battery of the utility model;
[0015] Figures 2 to 9 This is a schematic diagram of the manufacturing process of a preferred embodiment of the polymer lithium battery of the present invention. DETAILED DESCRIPTION
[0016] See also Figure 1 , which is a schematic diagram of an exploded view of a preferred embodiment of the polymer lithium battery of the utility model, Figures 2 to 9 To describe the design of the utility model in detail. Figures 2 to 9 A schematic diagram of the manufacturing process of this preferred embodiment is as follows: Figure 2The schematic diagram of the battery protection board (PCM) in the preferred embodiment is as follows: Figure 3 The schematic diagram of the combination of the battery protection plate and the battery cell in the preferred embodiment is as follows: Figure 4 A schematic diagram of a preferred embodiment in which the battery protection plate and the battery are combined and placed in a fixture is shown in FIG. Figure 5 The schematic diagram of the operation of flattening the positive nickel sheet in the preferred embodiment is as follows: Figure 6 A schematic diagram of laser welding in a preferred embodiment is shown below. Figure 7 Therefore, in a preferred embodiment, after laser welding is completed, the battery protection plate and the battery cell are removed from the fixture. Figure 8 The schematic diagram of the battery shaping in the preferred embodiment is as follows: Fig. 9 This is a schematic diagram of the battery assembled in the preferred embodiment.
[0017] The polymer lithium battery of the utility model mainly comprises: an upper shell 10, a bottom shell 20, a first battery cell 30, a second battery cell 40, and a battery cell protection plate 50; the upper shell 10 is assembled on the bottom shell 20 to form a storage space for accommodating the first battery cell 30, the second battery cell 40 and the battery cell protection plate 50; the first battery cell 30 and the second battery cell 40 are stacked up and down, and the battery cell protection plate 50 is erected on one side of the electrodes of the first battery cell 30 and the second battery cell 40; the battery cell protection plate 50 is provided with upper and lower positive nickel sheets 51 and 52 at positions facing the positive electrodes 31 and 41 of the first battery cell 30 and the second battery cell 40, respectively. 3. Upper and lower negative nickel sheets 52 and 54 are respectively provided on the cell protection plate 50 at positions facing the negative electrodes 32 and 42 of the first cell 30 and the second cell 40; the positive nickel sheets 51 and 53 include integrated patch portions 511 and 531 and extension portions 512 and 532, the patch portions 511 and 531 are tightly fitted and fixed to the cell protection plate 50, and the extension portions 512 and 532 extending from the patch portions 511 and 531 away from the cell protection plate 50 are folded and fitted toward the patch portions 511 and 531 to clamp the corresponding positive electrodes 31 and 41 of the cells therebetween and fix them together by laser welding.
[0018] Since the negative electrodes 32 and 42 of the first battery cell 30 and the second battery cell 40 are usually made of nickel, they do not need to be specially designed like the positive nickel sheets 51 and 53. The negative nickel sheets 52 and 54 can be designed to be tightly fitted and fixed to the battery cell protection plate 50 as a whole. In order to cooperate with subsequent welding, the shape and size of the negative nickel sheets 52 and 54 can be designed to match the negative electrodes 32 and 42. With the structural design of the utility model, not only the positive nickel sheets 51 and 53 and the positive electrodes 31 and 41 of the battery cells, but also the negative nickel sheets 52 and 54 and the negative electrodes 32 and 42 can be fixed together by laser welding.
[0019] In this preferred embodiment, in order to facilitate assembly and simplify the jig, the extension portions 512 and 532 of the upper and lower positive nickel sheets 51 and 53 are back to back and folded counterclockwise and clockwise respectively to fit the corresponding patch portions 511 and 531 .
[0020] The polymer lithium battery structure of the utility model adopts a laser welding process structure, which greatly simplifies the process, is safe and reliable, and reduces costs. There is no need to transfer a nickel sheet like the prior art. The positive electrode of the utility model can be directly laser welded with the nickel sheet, and the process is simple, reliable and safe.
[0021] When making the polymer lithium battery of this utility model, refer to Figure 2 First, the upper and lower positive nickel sheets 51, 53 and the upper and lower negative nickel sheets 52, 54 can be fixed on the battery protection board 50 according to the predetermined positions; then, Figure 3 As shown, the first battery cell 30 and the second battery cell 40 are now combined with the battery cell protection plate 50; then Figure 4 As shown, the combination is placed in a laser fixture 60, and the laser fixture 60 can be pre-designed according to the size of the polymer lithium battery of the utility model; Figure 5 As shown, the patch parts 511 and 531 of the positive nickel sheets 51 and 53 are pressed flat on the positive electrodes 31 and 41 of the battery cell; then Figure 6 As shown, laser welding is then performed. Two cells can be laser welded at the same time. Figure 7 As shown, it is taken out from the laser fixture 60; then Figure 8 As shown, the first battery cell 30 and the second battery cell 40 are stacked up and down and shaped; then as shown in 9, the shaped first battery cell 30 and the second battery cell 40 are assembled into a plastic shell composed of an upper shell 10 and a bottom shell 20, and finally a polymer lithium battery consisting of two battery cells, a PCM and a plastic shell is obtained.
[0022] In summary, the polymer lithium battery of the utility model does not need to transfer a nickel sheet during production, and the positive electrode of the battery cell is directly welded to the nickel sheet by laser, and the process is simple, reliable and safe.
[0023] As described above, for ordinary technicians in this field, various other corresponding changes and modifications can be made according to the technical scheme and technical concept of the utility model, and all these changes and modifications should fall within the protection scope of the claims attached to the utility model.
Claims
1. A polymer lithium battery, characterized in that: include: An upper shell (10), a bottom shell (20), a first battery cell (30), a second battery cell (40), and a battery cell protection plate (50); the upper shell (10) is assembled on the bottom shell (20) to form a storage space for accommodating the first battery cell (30), the second battery cell (40), and the battery cell protection plate (50); the first battery cell (30) and the second battery cell (40) are stacked up and down, and the battery cell protection plate (50) is erected on one side of the electrodes of the first battery cell (30) and the second battery cell (40); upper and lower positive nickel sheets (51, 53) are respectively provided on the battery cell protection plate (50) at positions facing the positive electrodes (31, 41) of the first battery cell (30) and the second battery cell (40); Two upper and lower negative electrode nickel sheets (52, 54) are respectively provided on the battery cell protection plate (50) at positions facing the negative electrodes (32, 42) of the first battery cell (30) and the second battery cell (40); the positive electrode nickel sheets (51, 53) comprise an integrated patch portion (511, 531) and an extension portion (512, 532); the patch portion (511, 531) is tightly fitted and fixed to the battery cell protection plate (50); the extension portion (512, 532) extending from the patch portion (511, 531) away from the battery cell protection plate (50) is folded and fitted in the direction of the patch portion (511, 531) so as to clamp the corresponding battery cell positive electrode (31, 41) between the two and fix them together by laser welding.
2. The polymer lithium battery according to claim 1, characterized in that: The negative electrode nickel sheets (52, 54) are integrally and tightly fitted to the battery cell protection plate (50).
3. The polymer lithium battery according to claim 1, characterized in that: The shape and size of the negative electrode nickel sheet (52, 54) match those of the negative electrode (32, 42).
4. The polymer lithium battery according to claim 1, characterized in that: The negative electrode nickel sheet (52, 54) and the negative electrode (32, 42) are fixed together via laser welding.
5. The polymer lithium battery according to claim 1, characterized in that: The extension portions (512, 532) of the upper and lower positive nickel sheets (51, 53) are folded in a counterclockwise direction and a clockwise direction respectively to fit the corresponding patch portions (511, 531).