Battery insulation sleeve, battery, battery module and battery pack
By eliminating the need for adhesive coating on the positive terminal of the battery cell using a non-woven fabric battery insulating sleeve, the problem of separator damage caused by adhesive coating is solved, enabling efficient electrolyte penetration and improving battery performance and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG LISUN ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-05-29
- Publication Date
- 2026-06-09
AI Technical Summary
In the current battery manufacturing process, the coating process can damage the separator, affecting battery performance and resulting in low electrolyte penetration efficiency.
The battery insulating sleeve made of non-woven fabric eliminates the need for the coating process on the positive terminal of the battery cell. It is equipped with an injection hole and a through hole, allowing direct connection to the positive electrode tab. The wettability of the non-woven fabric also accelerates the penetration of the electrolyte.
This avoids damage to the separator, improves the wetting efficiency of the electrolyte, ensures battery performance, and reduces production costs.
Smart Images
Figure CN224342494U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery insulating sleeve, a battery, a battery module, and a battery pack. Background Technology
[0002] In the manufacturing process of cylindrical all-tab batteries, the exposed portion of the positive electrode tab needs to be coated with adhesive to prevent short circuits caused by contact with the battery casing. However, existing coating methods not only result in wrinkles that can damage the cell separator and ultimately affect battery performance, but also, during the electrolyte injection process, the electrolyte can only be injected into the center hole of the core through the injection hole in the coated area. This means the electrolyte can only penetrate sequentially from the center hole towards the outer wall of the core. Since the core has many layers, this layer-by-layer penetration results in slow electrolyte seepage, thus affecting the wetting efficiency. Utility Model Content
[0003] To solve the above-mentioned technical problems, this utility model provides a battery insulating sleeve, a battery, a battery module, and a battery pack, eliminating the cell coating process, thereby avoiding damage to the separator caused by coating, ensuring battery performance, and improving electrolyte wetting efficiency.
[0004] The technical solution adopted by this utility model to solve its technical problem is:
[0005] A battery insulating sleeve is used to connect the positive terminal of a battery cell. The battery insulating sleeve is made of non-woven fabric and includes a top cover and a sleeve connected to each other. The sleeve is cylindrical. The top cover covers one end of the sleeve, and the other end of the sleeve has an opening. The top cover is provided with injection holes and at least one through hole at intervals. The through hole is used for the positive electrode tab of the battery cell to pass through.
[0006] Preferably, the top cover is circular, and its diameter D ranges from 17 to 21 mm.
[0007] Preferably, the injection hole is circular, and its diameter d ranges from 4 to 8 mm.
[0008] Preferably, the height of the sleeve is h, and the value of h ranges from 3 to 10 mm.
[0009] Preferably, the thickness of the top cover is 0.2 to 1 mm, and the thickness of the sleeve is 0.2 to 1 mm.
[0010] Preferably, the through hole is rectangular, with a length of a and a width of b, where a ranges from 4 to 8 mm and b ranges from 0.5 to 2 mm.
[0011] Preferably, the battery insulating sleeve is integrally stamped.
[0012] A battery comprising:
[0013] case;
[0014] The battery cell, disposed within the housing, includes a core, a positive electrode tab, and a negative electrode tab disposed at both ends of the core;
[0015] Positive current collector, connected to the positive electrode tab;
[0016] The negative electrode current collector connects the negative electrode tab to the bottom wall of the housing;
[0017] The aforementioned battery insulating sleeve is fitted onto one end of the winding core where the positive electrode tab is located. The inner circumferential wall of the sleeve is in contact with the outer circumferential wall of the winding core, and the battery insulating sleeve covers the positive electrode current collector therein. The free end of the positive electrode tab passes through the through hole.
[0018] A battery module includes a conductive connector and a plurality of batteries as described above, wherein the positive electrode tabs of the plurality of batteries are connected through the conductive connector.
[0019] A battery pack comprising at least one of the aforementioned battery modules.
[0020] The beneficial effects of this utility model are as follows:
[0021] By using non-woven fabric to make the battery insulating sleeve, it can be directly fitted onto the positive terminal of the battery cell, covering the positive current collector of the positive terminal. This avoids battery short circuits and eliminates the need for adhesive coating of the positive electrode tabs. This not only avoids damage to the separator caused by adhesive coating, thus ensuring battery performance, but also reduces production costs. Simultaneously, because the top cover has an injection hole, and the non-woven fabric itself is wettable to electrolyte, during the injection process, electrolyte can be injected directly into the center hole of the core through the injection hole, allowing it to penetrate from the center to the outer wall. Furthermore, the electrolyte can also penetrate directly from the end of the core through the non-woven fabric top cover into the space between the electrode and the separator, thus accelerating electrolyte penetration and improving wetting efficiency.
[0022] In addition, since the top cover has a through hole for the positive electrode tab to pass through, the battery insulation sleeve will not affect the normal function of the positive electrode tab. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of the battery insulating sleeve of this utility model.
[0024] Figure 2 This is a top view of the battery insulating sleeve of this utility model.
[0025] Figure 3 This is a schematic diagram of the battery cell structure of this utility model.
[0026] Figure 4 This is a partial cross-sectional view of the battery cell of this utility model.
[0027] Wherein: 1-top cover, 11-injection hole, 12-through hole, 2-sleeve;
[0028] 10-Battery cell, 101-Coil core, 102-Positive electrode tab, 20-Positive current collector, 30-Negative current collector, 40-Battery insulation sleeve. Detailed Implementation
[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0030] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.
[0031] like Figure 1-4 As shown, a preferred embodiment of the present invention provides a battery comprising a casing, a battery cell 10, a positive current collector 20, a negative current collector 30, and a battery insulating sleeve 40. The casing is a cylindrical shape with one open end, and the battery cell 10 is inserted into the casing through the opening. The battery cell 10 includes a core 101, positive electrode tabs 102 and negative electrode tabs disposed at both ends of the core 101. The core 101 is composed of a positive electrode sheet, a negative electrode sheet, and a separator, with the separator disposed between the positive and negative electrode sheets. The positive current collector 20 is welded to the positive electrode tab 102, and the negative current collector 30 is connected to the negative electrode tab and the bottom wall of the casing. A mesh insulating sheet is provided between the positive current collector 20 and the negative current collector 30 and the end face of the core 101.
[0032] The battery insulating sleeve 40 is made of non-woven fabric. The battery insulating sleeve includes a top cover 1 and a sleeve 2 connected together. The sleeve 2 is cylindrical. The top cover 1 seals one end of the sleeve 2, and the other end of the sleeve 2 has an opening. The top cover 1 is provided with injection holes 11 and at least one through hole 12 at intervals. The specific number of through holes 12 corresponds to the number of positive electrode tabs 102. During connection, the opening of the sleeve 2 is fitted onto the end of the core 101 where the positive electrode tab 102 is located, so that the inner peripheral wall of the sleeve 2 fits against the outer peripheral wall of the core 101, and the positive electrode current collector 20 is enclosed therein. The free end of the positive electrode tab 102 passes through the through hole 12.
[0033] Based on the aforementioned technical features, the battery insulation sleeve 40, made of non-woven fabric, can be directly fitted onto the positive terminal of the cell 10, encasing the positive current collector 20 of the cell's positive terminal. This prevents short circuits and eliminates the need for encapsulation of the positive electrode tab 102, avoiding damage to the separator caused by encapsulation and ensuring battery performance while reducing production costs. Furthermore, because the top cover 1 has an injection hole 11, and the non-woven fabric itself is wettable to electrolyte, during the injection process, electrolyte can be directly injected into the center hole of the core 101 through the injection hole 11, allowing it to penetrate from the center to the outer wall. Additionally, the electrolyte can also penetrate directly from the end of the core 101 through the non-woven fabric top cover 1 into the space between the electrode and the separator, accelerating electrolyte penetration and improving wetting efficiency.
[0034] In addition, since the top cover 1 has a through hole 12 for the positive electrode tab 102 to pass through, the battery insulating sleeve 40 will not affect the normal function of the positive electrode tab 102.
[0035] It should be noted that the manifold has a liquid discharge hole, which will not affect the electrolyte injection.
[0036] The battery insulating sleeve 40 can be cylindrical, square, or other cylindrical shapes, mainly corresponding to the cross-sectional shape of the battery cell 10. For example, if it is a cylindrical battery cell, the top cover 1 is circular, and its diameter D ranges from 17 to 21 mm, such as 18 mm, 18.5 mm, 19 mm, 19.5 mm, 20 mm, 20.5 mm, etc.
[0037] The injection hole 11 can be circular or elliptical, preferably circular, and its diameter d ranges from 4 to 8 mm, ensuring it is larger than the hole diameter in the middle of the core 101, such as 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, etc. When the injection hole 11 is elliptical, its major axis is slightly longer than its minor axis, that is, it approximates a circle.
[0038] The through hole 12 is rectangular, and if its length is a and its width is b, the value of a ranges from 4 to 8 mm, such as 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, etc.; the value of b ranges from 0.5 to 2 mm, such as 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, etc.
[0039] The height of the sleeve 2 is h, and the value of h ranges from 3 to 10 mm, such as 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 8 mm, 8.5 mm, etc.
[0040] The thickness of the top cover 1 and the sleeve 2 can be the same or different, but their thickness values must be within the range of 0.2 to 1 mm to avoid affecting the installation of the battery cell 10 inside the housing. Examples of thickness values include 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, and 0.9 mm. Preferably, the top cover 1 and the sleeve 2 have the same thickness, and the battery insulating sleeve 40 is integrally stamped, which not only facilitates manufacturing but also ensures the strength of the battery insulating sleeve 40 itself. It should be noted that the thickness of the sleeve 2 refers to the thickness of its manufacturing material.
[0041] To address the aforementioned technical problems, this application also provides a battery pack, comprising at least one battery module. The battery module includes a conductive connector and multiple batteries, with the positive electrode tabs 102 of the multiple batteries connected via the conductive connector. This battery module eliminates the need for a coating process on the battery cells 10, thus avoiding damage to the separator caused by coating, ensuring battery performance, and consequently guaranteeing the overall performance of the battery module.
[0042] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A battery insulating sleeve for connecting the positive terminal of a battery cell, characterized in that: The battery insulating sleeve is made of non-woven fabric. The battery insulating sleeve includes a top cover and a sleeve connected together. The sleeve is cylindrical. The top cover covers one end of the sleeve, and the other end of the sleeve has an opening. The top cover is provided with injection holes and at least one through hole at intervals. The through hole is used for the positive electrode tab of the power supply core to pass through.
2. The battery insulating sleeve as described in claim 1, characterized in that: The top cover is circular, and its diameter D ranges from 17 to 21 mm.
3. The battery insulating sleeve as described in claim 1, characterized in that: The injection hole is circular, and its diameter d ranges from 4 to 8 mm.
4. The battery insulating sleeve as described in claim 1, characterized in that: The height of the sleeve is h, and the value of h ranges from 3 to 10 mm.
5. The battery insulating sleeve as described in claim 1, characterized in that: The thickness of the top cover is 0.2-1 mm, and the thickness of the sleeve is 0.2-1 mm.
6. The battery insulating sleeve as described in any one of claims 1-5, characterized in that: The through hole is rectangular, with a length of a and a width of b, where a ranges from 4 to 8 mm and b ranges from 0.5 to 2 mm.
7. The battery insulating sleeve as described in any one of claims 1-5, characterized in that: The battery insulating sleeve is integrally stamped.
8. A battery, characterized in that, include: case; The battery cell, disposed within the housing, includes a core, a positive electrode tab, and a negative electrode tab disposed at both ends of the core; Positive current collector, connected to the positive electrode tab; The negative electrode current collector connects the negative electrode tab to the bottom wall of the housing; The battery insulating sleeve as described in any one of claims 1-7 is sleeved on one end of the winding core where the positive electrode tab is located, the inner peripheral wall of the sleeve is in contact with the outer peripheral wall of the winding core, and the battery insulating sleeve covers the positive electrode current collector therein, with the free end of the positive electrode tab passing through the through hole.
9. A battery module, characterized in that, It includes a conductive connector and a plurality of batteries as described in claim 8, wherein the positive electrode tabs of the plurality of batteries are connected through the conductive connector.
10. A battery pack, characterized in that, It includes at least one battery module as described in claim 9.