Electronic equipment
By attaching a porous protective tape to the inside of the electrode bend, the problems of creases and material loss at the bend of the wound cell were solved, thus improving safety and capacity.
Patent Information
- Application Number
- CN202422675388.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2034-11-04
AI Technical Summary
Existing wound cells suffer from creases and material loss at bends because the high-density electrode sheets cannot withstand excessive deformation, affecting safety and capacity.
A porous protective tape is pasted on the inside of the bent electrode to increase its thickness and trap any loose material. Small pinholes are provided on the protective tape to allow lithium-ion reaction and prevent capacity loss.
Reduce creases at bends to prevent material loss, ensure proper lithium-ion reaction, and improve safety and battery capacity.
Smart Images
Figure CN223898301U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to an electronic equipment belongs to lithium battery technical field. BACKGROUND
[0002] In order to pursue higher energy density, the winding core in the prior art usually uses high compaction density pole piece, and cold pressing or hot pressing is carried out after winding to form the winding core that the positive pole piece, the negative pole piece and the diaphragm are tightly attached. Due to the inherent defects of the winding process, the positive and negative pole pieces will have greater bending deformation in the corner area inside the winding core. The pole piece with high compaction density is usually difficult to withstand excessive bending deformation, which eventually leads to the formation of serious creases on its surface, accompanied by different degrees of material falling. It causes the capacity loss of the winding core, and the falling material also causes the risk of piercing the diaphragm, which seriously affects the safety. SUMMARY
[0003] The utility model provides an electronic equipment, solved the problem disclosed in the background art.
[0004] According to one aspect of the present disclosure, an electrode piece of a battery cell is provided, comprising an electrode piece body and a plurality of porous protective tapes attached to the electrode piece body; when the electrode piece body is wound, the porous protective tapes are located on the inside of the bending of the electrode piece body.
[0005] Attaching the porous protective tapes on the inside of the bending not only increases the thickness of the place, thereby reducing the creases at the bending, but also sticks the falling material due to the bending, and the porous structure allows the lithium ions in the covered area to participate in the electrochemical reaction normally, avoiding capacity loss.
[0006] In some embodiments of the present disclosure, the porous protective tape is a protective tape densely covered with pinholes; using pinholes with very small aperture not only enables the lithium ions in the covered area to participate in the electrochemical reaction normally, but also prevents the falling polar material from passing through, further ensuring safety.
[0007] In some embodiments of the present disclosure, the pinholes are arranged in a uniform array, which is more convenient for processing.
[0008] In some embodiments of the present disclosure, the length of the porous protective tape is less than the width of the electrode piece body, the end of the porous protective tape is not aligned with the side edge of the electrode piece body, and a predetermined distance is left between the two.
[0009] Using a shorter porous protective tape can effectively prevent the porous protective tape from affecting the winding of the electrode piece body, and can save materials, thereby reducing costs.
[0010] In some embodiments of the present disclosure, the porous protective tape is a porous high-temperature adhesive tape, which is easy to obtain and has low cost.
[0011] According to another aspect of the present disclosure, there is provided an electric core, wherein the positive electrode sheet and / or the negative electrode sheet in the electric core is the electrode sheet as described above; the electric core using the electrode sheet as described above is safer and has no capacity loss.
[0012] According to another aspect of the present disclosure, there is provided a battery, comprising the electric core as described above; the battery using the electric core as described above is safer and has no capacity loss.
[0013] According to another aspect of the present disclosure, there is provided an electronic device, comprising the battery as described above; the electronic device using the battery as described above is safer and has no capacity loss.
[0014] The utility model discloses reached beneficial effect: the utility model discloses in the bending inner side pastes porous protective band, not only can increase the thickness of this place, thereby reducing the crease of bending, and can stick the material that appears because bending, and porous structure allows the lithium ion of protective band covering area to participate in electrochemical reaction normally, avoids capacity loss. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is structural schematic diagram of electrode sheet of electric core;
[0016] Figure 2 It is structural schematic diagram of porous protective band;
[0017] Figure 3 It is structural schematic diagram of electric core. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present disclosure.
[0019] Unless otherwise specified, the relative arrangement, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.
[0020] Meanwhile, it should be understood that, for the convenience of description, the sizes of various parts shown in the drawings are not drawn in accordance with the actual proportional relationship.
[0021] The technologies, methods and devices known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the technologies, methods and devices should be regarded as part of the specification.
[0022] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of exemplary embodiments can have different values.
[0023] It should be noted that like reference numerals and letters refer to like items throughout the several views, and that once an item is defined in one view, it need not be discussed further in subsequent views.
[0024] To solve the problem of capacity loss caused by the falling of the electrode tab due to bending, the present disclosure provides an electrode tab, an electrode, a battery and an electronic device.
[0025] Figure 1 A schematic diagram of an embodiment of the electrode tab of the present disclosure includes a tab body 1 and a plurality of porous protective tapes 2 attached to the tab body 1. When the tab body 1 is wound, the porous protective tapes 2 are located on the inside of the bending of the tab body 1.
[0026] It should be noted that the structure of the tab body 1 is the existing structure, including a base body and a polarity layer on the base body. When the tab body 1 is wound, bending occurs, resulting in creases at the bending, which can cause the polarity layer on the base body to separate, i.e., the material falls off.
[0027] To reduce the creases and thus the falling of the material, some wound electrodes can be disassembled in advance to observe the crease areas where the surface of the tab body 1 has obvious falling of the material, and the positions and quantities are recorded, so that protective tapes are attached to the corresponding positions of the tab body 1. For example, if the first 2-6 creases at the winding end show falling of the material, protective tapes will be attached to the corresponding positions of the tab body 1. The protective tapes not only increase the thickness of the area, thereby reducing the creases at the bending, but also can stick to the falling material caused by bending.
[0028] Although the protective tapes can prevent the falling of the material, the coverage of the protective tapes can cause the lithium ions in the covered area to not participate in the electrochemical reaction normally, resulting in capacity loss. Therefore, holes are opened in the protective tapes, i.e., the porous protective tapes 2 are used, which have a high porosity. This porous structure allows the lithium ions in the covered area of the protective tapes to participate in the electrochemical reaction normally, avoiding capacity loss.
[0029] It should be noted that if the holes are too large, the polarity material directly opposite the holes can also fall off through the holes. Therefore, in some embodiments, the holes are made very small, and a protective tape with densely distributed pinholes is used. The diameter of the pinholes can be 1-2 mm. Such pinholes with a very small diameter not only allow the lithium ions in the covered area to participate in the electrochemical reaction normally, but also make it difficult for the falling polarity material to pass through, further ensuring safety.
[0030] It should be noted that in order to facilitate processing, in some embodiments, the pinholes are arranged in a uniform array, which can be seen in detail inFigure 2 The pinholes are distributed in three columns, but other distribution modes can also be adopted.
[0031] It should be noted that, in order to be convenient and low in cost, in some embodiments, the porous protection tape 2 is a porous high-temperature adhesive tape, which is made of PET material and has a thickness of 20-35 um and a width of 10-20 mm.
[0032] It should be noted that the winding of the pole piece body 1 produces a transverse crease, so the corresponding porous protection tape 2 is also pasted along the transverse direction of the pole piece body 1. The excess length of the porous protection tape 2 will affect the winding of the pole piece body 1. Therefore, in some embodiments, the length of the porous protection tape 2 is less than the width of the pole piece body 1, and the end of the porous protection tape 2 is not aligned with the side edge of the pole piece body 1, and a preset distance is left therebetween, such as 0-10 mm. The use of a shorter porous protection tape 2 can not only effectively prevent the porous protection tape 2 from affecting the winding of the pole piece body 1, but also save materials and reduce costs.
[0033] Figure 3 FIG. 1 is a schematic view of an embodiment of the battery cell of the present disclosure, specifically a wound battery cell, which comprises a separator, a negative pole piece and a positive pole piece 3. The separator, the negative pole piece 4 and the positive pole piece 3 are sequentially wound, and a complete wound battery cell is finally obtained through a winding-flattening process. The positive pole piece 3 and / or the negative pole piece 4 is the above-mentioned battery cell pole piece.
[0034] It should be noted that, in order to determine the position of the porous protection tape 2, some wound battery cells can be disassembled in advance to observe which pole piece has obvious material loss. If it is the negative pole piece 4, the porous protection tape 2 is pasted on the negative pole piece 4. If it is the positive pole piece 3, the porous protection tape 2 is pasted on the positive pole piece 3. If both have, the porous protection tape 2 is pasted on both the positive pole piece 3 and the negative pole piece 4. The battery cell using the above-mentioned battery cell pole piece is more secure and has no capacity loss.
[0035] On the basis of the above-mentioned battery cell, a battery is also disclosed, which comprises the above-mentioned battery cell. The battery using the above-mentioned battery cell is more secure and has no capacity loss.
[0036] On the basis of the above-mentioned battery, an electronic device is also disclosed, which comprises the above-mentioned battery. The electronic device using the above-mentioned battery is more secure and has no capacity loss.
[0037] The above-mentioned is only the preferred embodiment of the present application, and it should be noted that, for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, which should also be considered as the protection scope of the present application.
Claims
1. An electronic device, characterized in that, The battery includes a cell, and the positive and / or negative electrode in the cell includes an electrode body and a plurality of porous protective strips attached to the electrode body; when the electrode body is wound, the porous protective strips are located on the inside of the bend of the electrode body; the length of the porous protective strips is less than the width of the electrode body, the ends of the porous protective strips are not aligned with the sides of the electrode body, and there is a preset distance between them.
2. The electronic device according to claim 1, characterized in that, The porous protective tape is a protective tape with numerous pinholes.
3. The electronic device according to claim 2, characterized in that, The pinholes are distributed in a uniform array.
4. The electronic device according to any one of claims 1 to 3, characterized in that, The porous protective tape is a porous high-temperature adhesive tape.