Tab protection adhesive tape and battery

Abstract

The utility model discloses a tab protection adhesive tape and a battery, the application condition of the tab protection adhesive tape is as follows: a connecting sheet is welded between the lower surfaces of tabs on adjacent battery cells, and the tab protection adhesive tape specifically comprises an upper rubberizing adhesive tape, a lower rubberizing adhesive tape and a lower rubberizing adhesive tape, and two ends of the lower adhesive tape are adhered to the lower surface of the connecting sheet and the outer surface of the battery cell and completely stretch across and cover the tabs. According to the utility model, the problem that the tabs are torn due to the fact that pulling force is generated on the tabs is avoided, and meanwhile, the tabs are not influenced by adhesion of an adhesive tape and are not easy to fold, so that the phenomenon that the tabs are inserted into a battery cell is avoided, and the safety performance and the stability of the battery are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a tab protection tape and a battery. Background Art

[0002] Gluing is an indispensable process in the battery assembly process. It is commonly used in bundling multiple battery cells, welding marks after ultrasonic welding, welding marks after connecting pieces, and bundling after cell assembly. Among them, welding marks after ultrasonic welding are mainly used to prevent metal chips generated after ultrasonic welding and burrs on the tabs and battery cells from piercing the diaphragm. Glue is applied to the ultrasonic welding marks and on the battery cells and tabs to avoid abnormalities that may cause battery short circuits and improve battery safety.

[0003] In existing technology, ultrasonic welding and printing adhesive tape is generally applied by completely attaching the middle of the tape to the tab and the ends to the battery cell and connector. This method can easily cause the tab to tear due to the pulling force between the tape and the battery cell or connector during battery cell transportation and assembly. Furthermore, if the adhesive tape is not properly applied to the tab, the tab can easily be pulled by the tape, causing wrinkles. After the battery cell is assembled and placed in the shell, the wrinkled tab can be inserted into the battery cell. Both of these situations can cause battery short circuits, seriously affecting battery safety. Utility Model Content

[0004] The main purpose of the utility model is to provide a tab protection tape and a battery that can prevent the tab from being pulled.

[0005] To achieve the above-mentioned purpose, the utility model provides a tab protection tape, which is applied under the following conditions: welding connecting pieces between the lower surfaces of the tabs on adjacent battery cells, comprising:

[0006] The upper adhesive tape is pasted on the upper surface of the tab and completely covers the tab;

[0007] The lower part is pasted with adhesive tape, with both ends pasted on the lower surface of the connecting piece and the outer surface of the battery cell and completely spanning to cover the pole ear.

[0008] Furthermore, the lower adhesive tape includes a first adhesive area, a non-adhesive area and a second adhesive area in sequence, the first adhesive area corresponds to the connecting piece, the non-adhesive area corresponds to the tab, and the second adhesive area corresponds to the battery cell.

[0009] Furthermore, the non-sticky area is non-sticky or slightly sticky or has the ability to electrostatically adsorb the tab.

[0010] Furthermore, a side of the upper adhesive tape close to the battery cell extends beyond the tab and is adhered to a side surface of the battery cell.

[0011] Furthermore, the adhesive cooperation between the lower adhesive tape and the battery core extends from the side surface of the battery core to the lower surface of the battery core.

[0012] Furthermore, both ends of the upper adhesive tape in the length direction extend beyond the tabs.

[0013] Furthermore, both ends of the lower adhesive tape in the length direction extend beyond the tabs.

[0014] Furthermore, the peel strength of the upper adhesive tape and the lower adhesive tape is in the range of ≥6N / 25mm.

[0015] Furthermore, the thickness of the upper adhesive tape and the lower adhesive tape is in the range of 50±5 um.

[0016] The present invention also provides a battery, comprising a battery cell, wherein connecting pieces are welded between the lower surfaces of the tabs on adjacent battery cells, and the above-mentioned tab protection tape is applied to the battery.

[0017] The beneficial effects of the present invention are as follows:

[0018] The tab protection tape of the present invention is divided into two independent parts, wherein the upper adhesive tape is attached to the tab, and there is no pulling force between the tape and the battery cell or the connecting piece, thereby preventing the tab from being torn during the battery cell transportation after the adhesive tape is completed; and the lower adhesive tape is only pasted on the connecting piece and the battery cell at both ends, and the middle part does not adhere to the tab. Therefore, no pulling force will be generated on the tab to cause the tab to tear. At the same time, the tab is not affected by the adhesion of the tape, and the tab wrinkle problem is not easy to occur, thereby avoiding the tab from being inserted into the battery cell, effectively improving the safety performance and stability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure and usage of the tab protection tape according to one embodiment of the present invention (from top perspective);

[0020] Figure 2 This is a schematic diagram of the structure and usage of the tab protection tape according to one embodiment of the present invention (from the bottom perspective);

[0021] Figure 3 for Figure 1 A partial enlarged view after removing the adhesive tape on the upper part of one side;

[0022] Figure 4 for Figure 2 A partial enlarged view after removing the adhesive tape on the lower part of one side;

[0023] Figure 5 The figure is a side structural diagram of a tab protection tape according to an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1. Battery cells;

[0026] 2. Tab; 21. Upper weld print area;

[0027] 3. Connecting piece; 31. Lower welding area;

[0028] 4. Apply adhesive tape on the upper part;

[0029] 5. Lower adhesive tape; 51. First adhesive area; 52. Non-adhesive area; 53. Second adhesive area. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, if the embodiments of the present invention include descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of such features.

[0033] See also Figures 1 to 5 .

[0034] The tab protection tape provided by the utility model is applied under the following conditions: welding a connecting piece 3 between the lower surfaces of the tabs 2 on adjacent battery cells 1, comprising:

[0035] The upper adhesive tape 4 is adhered to the upper surface of the tab 2 and completely covers the tab 2;

[0036] The lower adhesive tape 5 has its two ends adhered to the lower surface of the connecting piece 3 and the outer surface of the battery cell 1 and completely spans and covers the tab 2 .

[0037] The tab protection tape of the present invention is divided into two independent parts, wherein the upper adhesive tape is attached to the tab, and there is no pulling force between the tape and the battery cell or the connecting piece, thereby preventing the tab from being torn during the battery cell transportation after the adhesive tape is completed; and the lower adhesive tape is only pasted on the connecting piece and the battery cell at both ends, and the middle part does not adhere to the tab. Therefore, no pulling force will be generated on the tab to cause the tab to tear. At the same time, the tab is not affected by the adhesion of the tape, and the tab wrinkle problem is not easy to occur, thereby avoiding the tab from being inserted into the battery cell, effectively improving the safety performance and stability of the battery.

[0038] In one embodiment, the lower adhesive tape 5 sequentially includes a first adhesive area 51, a non-adhesive area 52, and a second adhesive area 53. The first adhesive area 51 corresponds to the connecting sheet 3, the non-adhesive area 52 corresponds to the tab 2, and the second adhesive area 53 corresponds to the battery cell 1. This design allows the first and second adhesive areas to be firmly adhered to the connecting sheet and the battery cell, making the entire lower adhesive tape less likely to fall off. The non-adhesive area, being non-sticky, does not adhere to the tab, thus protecting the tab from the pulling force of the tape and causing the tab to tear. Furthermore, the non-adhesive area does not adhere to the tab, preventing the tab from being affected by the adhesive tape and less likely to wrinkle. This prevents the tab from being inserted into the tab during battery assembly, effectively improving the safety and stability of the battery.

[0039] In a specific implementation, the width of an adhesive zone 51 is 14±0.5 mm, so that there is sufficient bonding area between the tape and the connecting piece, ensuring the bonding strength between the tape and the connecting piece, and reducing the risk of the tape falling off; the width of the non-adhesive zone 52 is 13.5±0.5 mm, and the width of the non-adhesive zone is moderate, which can provide a certain buffer space in the subsequent battery cell transportation and core assembly process, reducing the risk of the tab being torn due to the pulling force between the tape and the electrode; the width of the second adhesive zone 53 is 27.5±0.5 mm, so that there is sufficient bonding area between the tape and the battery cell, ensuring the bonding strength between the tape and the battery cell, and reducing the risk of the tape falling off.

[0040] In one embodiment, the non-adhesive area 52 is non-adhesive or slightly adhesive, or has the ability to electrostatically adsorb the tab 2. The specific standard of "slightly adhesive" here is that the adhesiveness is less than that of the first and second adhesive areas, and the force between the tab and the non-adhesive area is as small as possible.

[0041] In one embodiment, the side of the upper adhesive tape 4 near the battery cell 1 extends beyond the tab 2 and is adhered to the side of the battery cell 1. This design ensures that the tape completely covers the tab, ensuring the insulation protection function of the upper adhesive tape. The overhang width does not need to be too large to avoid excessive pulling force on the tab, and is generally 2-3 mm.

[0042] In one embodiment, the adhesive connection between the lower adhesive tape 5 and the battery cell 1 extends from the side surface of the battery cell 1 to the lower surface of the battery cell 1. This design can improve the adhesive connection between the lower adhesive tape and the battery cell.

[0043] In one embodiment, the upper adhesive tape 4 extends beyond the tab 2 at both ends in the length direction. Generally, both ends extend beyond the tab by 0-7 mm. In the width direction, the upper adhesive tape 4 completely covers the tab 2 and the upper weld mark area 21 on the tab 2 (after the tab 2 is welded to the connecting piece 3, the upper surface of the tab 2 corresponds to the upper weld mark area 21, and the lower surface of the connecting piece 3 corresponds to the lower weld mark area 31), ensuring that the tape can completely cover the tab in the upper width direction, thereby ensuring the insulation protection function of the tab tape.

[0044] In one embodiment, the lower adhesive tape 5 extends beyond the tab 2 at both ends in the length direction. Generally, it also extends beyond the tab by 0-7 mm. In the width direction, the lower adhesive tape 4 completely covers the lower weld print area 31 on the connecting piece 3, ensuring that the tape can completely cover the tab in the upper width direction, thereby ensuring the insulation protection function of the tab tape.

[0045] In one embodiment, the peel strength of the upper adhesive tape 4 and the lower adhesive tape 5 is in the range of ≥6N / 25mm. If the peel strength is too low, the tape will easily fall off and cannot perform its function.

[0046] In one embodiment, the thickness of the upper adhesive tape 4 and the lower adhesive tape 5 is in the range of 50±5 μm. If the thickness is too small, the tape cannot provide insulation protection; if the thickness is too large, the space utilization in the height direction of the battery cell is affected and it is not conducive to the subsequent assembly of the battery cell.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tab protection tape, which is used for welding connecting pieces between the lower surfaces of the tabs on adjacent battery cells, characterized in that: include: The upper adhesive tape is pasted on the upper surface of the tab and completely covers the tab; The lower part is pasted with adhesive tape, with both ends pasted on the lower surface of the connecting piece and the outer surface of the battery cell and completely spanning to cover the pole ear.

2. The tab protection tape according to claim 1, wherein: The lower adhesive tape includes a first adhesive area, a non-adhesive area and a second adhesive area in sequence, the first adhesive area corresponds to the connecting piece, the non-adhesive area corresponds to the tab, and the second adhesive area corresponds to the battery cell.

3. The tab protection tape according to claim 2, wherein: The non-sticky area is non-sticky or slightly sticky or has the ability to electrostatically adsorb the tab.

4. The tab protection tape according to claim 1, 2 or 3, wherein: The side of the upper adhesive tape close to the battery core extends beyond the tab and is adhered to the side of the battery core.

5. The tab protection tape according to claim 1, 2 or 3, wherein: The adhesive cooperation between the lower adhesive tape and the battery core extends from the side surface of the battery core to the lower surface of the battery core.

6. The tab protection tape according to claim 1, 2 or 3, wherein: Both ends of the upper adhesive tape in the length direction extend beyond the tabs.

7. The tab protection tape according to claim 1, 2 or 3, wherein: Both ends of the lower adhesive tape in the length direction extend beyond the tabs.

8. The tab protection tape according to claim 1, 2 or 3, wherein: The peel strength of the upper adhesive tape and the lower adhesive tape is in the range of ≥6N / 25mm.

9. The tab protection tape according to claim 1, 2 or 3, wherein: The thickness of the upper adhesive tape and the lower adhesive tape is in the range of 50±5 μm.

10. A battery comprising a cell, wherein connecting pieces are welded between the lower surfaces of the tabs on adjacent cells, characterized in that: The battery is applied with the tab protection tape according to any one of claims 1 to 9.

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