Special-shaped winding type battery roll core and lithium ion battery adopting same

By cutting and adjusting the shape on the positive electrode sheet and negative electrode sheet of the lithium-ion battery, a special-shaped winding battery core is formed, which solves the problem of the incompatibility of the lithium-ion battery shape and the electronic product battery cavity space, and improves the battery life.

CN222654008UActive Publication Date: 2025-03-21GUANG DONG VDL NEW ENERGY CO LTD
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Patent Information

Application Number
CN202420666960.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-02
Publication Date
2025-03-21
Estimated Expiration
2034-04-02

AI Technical Summary

Technical Problem

The shape of existing lithium-ion batteries limits their adaptation to the battery cavity space of some electronic products, resulting in a shorter battery life.

Method used

A special-shaped winding battery core is adopted. The core is cut at the starting end and end of the positive electrode sheet and the negative electrode sheet to form a special-shaped shape, and a stepped, step, slope and arc-shaped structure are provided in the winding direction to adapt to battery cavity of different shapes.

Benefits of technology

It realizes multiple special-shaped adaptations of the battery coil core, makes full use of the space of the battery case, and significantly improves the battery life of the lithium-ion battery.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a special-shaped winding type battery roll core, which relates to the field of batteries and comprises a positive pole piece, a diaphragm and a negative pole piece which are sequentially stacked, the positive pole piece and the negative pole piece are provided with starting ends and ending ends, and the width of the starting ends of the positive pole piece and the negative pole piece is larger than that of the ending ends. Cutting the tops and / or bottoms of the positive pole piece and the negative pole piece along the winding direction of the positive pole piece and the negative pole piece, so that the positive pole piece and the negative pole piece are of special-shaped sheet structures; the utility model further provides a lithium ion battery adopting the battery roll core, the lithium ion battery comprises a battery shell body, and the special-shaped winding type battery roll core is arranged in the battery shell body. The battery roll core formed by winding the positive pole piece, the diaphragm and the negative pole piece has various special shapes, so that the battery roll core can adapt to the space in the shell of the battery shell of various electronic products such as Bluetooth earphones, and the cruising ability of the lithium ion battery is enhanced.
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Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a special-shaped winding battery core and a lithium-ion battery using the battery core. Background Art

[0002] Lithium-ion batteries are batteries that use lithium alloy metal oxide as the positive electrode material, graphite as the negative electrode material, and a non-aqueous electrolyte. They have the advantages of high energy density, long cycle life, and low self-discharge rate. Therefore, they are widely used in various consumer electronic products, such as mobile phones, tablets, laptops, Bluetooth headsets, etc.

[0003] In reality, there are two main types of lithium-ion batteries: laminated and wound. The laminated type can be made into various specific shapes, but the process is complex, the processing speed is low and the cost is high; the wound type has a fast processing speed and has obvious cost advantages, but it can usually only be made into rectangular and cylindrical lithium-ion batteries. In reality, the space inside the battery cavity of many electronic products such as Bluetooth headsets is irregular. Due to the shape of rectangular and cylindrical lithium-ion batteries, a lot of battery cavity space of Bluetooth headsets and other electronic products is often wasted, resulting in a short battery life. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned defects in the prior art and to provide a special-shaped wound battery core and a lithium-ion battery using the battery core, which is used to solve the problem that cylindrical and square lithium-ion batteries are not compatible with the battery cavity space of electronic products such as Bluetooth headsets, resulting in a relatively short battery life of electronic products such as headsets.

[0005] In order to solve the above technical problems, in the first aspect, the utility model provides a special-shaped wound battery core, comprising a positive electrode sheet, a separator and a negative electrode sheet stacked in sequence, the positive electrode sheet and the negative electrode sheet having a starting end and a tail end, characterized in that the width of the starting end of the positive electrode sheet and the negative electrode sheet is greater than the width of the tail end, and the positive electrode sheet and the negative electrode sheet are cut at the top and / or bottom along the winding direction of the positive electrode sheet and the negative electrode sheet, so that the positive electrode sheet and the negative electrode sheet are sheet structures of special shapes.

[0006] Furthermore, the top and / or bottom of the positive electrode sheet and the negative electrode sheet in the winding direction are stepped, and the number of steps at the top and / or bottom of the positive electrode sheet and the negative electrode sheet in the winding direction is at least one layer.

[0007] Furthermore, the positive electrode sheet and the negative electrode sheet are provided with stepped steps at the top and / or bottom in the winding direction, and a slope is provided at the end of the step; or, the positive electrode sheet and the negative electrode sheet are provided with a slope at the top and / or bottom in the winding direction, and a stepped step is provided at the end of the slope.

[0008] Furthermore, the positive electrode sheet and the negative electrode sheet are provided with stepped steps at the top and / or bottom in the winding direction, and the ends of the steps are provided with a plurality of slopes with different gradients.

[0009] Furthermore, the positive electrode sheet and the negative electrode sheet are provided with a slope at the top and / or bottom in the winding direction.

[0010] Furthermore, the positive electrode sheet and the negative electrode sheet are provided with a plurality of slopes with different slopes at the top and / or bottom in the winding direction.

[0011] Furthermore, the top and / or bottom of the positive electrode sheet and the negative electrode sheet in the winding direction are arc-shaped.

[0012] Furthermore, the positive electrode sheet and the negative electrode sheet are provided with stepped steps at the top and / or bottom in the winding direction, and the ends of the steps are arc-shaped; or, the positive electrode sheet and the negative electrode sheet are provided with slopes at the top and / or bottom in the winding direction, and the ends of the slopes are arc-shaped.

[0013] In the second aspect, an embodiment of the present application also provides a lithium-ion battery using the battery core, including a battery shell shell, and also including a special-shaped wound battery core as described in any of the above items, wherein the special-shaped wound battery core is arranged in the battery shell shell, and the battery shell shell is adapted to the shape of the special-shaped wound battery core.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] The utility model provides a special-shaped wound battery core and a lithium-ion battery using the battery core, in which the positive electrode sheet and the negative electrode sheet are cut at the top and / or bottom along the winding direction of the positive electrode sheet and the negative electrode sheet, so that the positive electrode sheet and the negative electrode sheet are sheet structures with special shapes, so that the battery core formed by winding the positive electrode sheet, the separator and the negative electrode sheet has various special shapes, so that the battery core can adapt to the space in the battery shell of various electronic products such as Bluetooth headsets, so that the space of the battery shell is fully utilized, the volume and capacity of the battery shell are greatly improved, and the endurance of the lithium-ion battery is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the positive electrode sheet, the separator and the negative electrode sheet of the utility model being stacked in sequence;

[0017] Figure 2 This is a front view of a special-shaped wound battery core provided by the utility model;

[0018] Figure 3 This is one of the cross-sectional views of Embodiment 1 of the present utility model;

[0019] Figure 4 This is the second cross-sectional view of Embodiment 1 of the present utility model;

[0020] Figure 5 This is a cross-sectional view of Embodiment 2 of the present utility model;

[0021] Figure 6 This is a cross-sectional view of Embodiment 3 of the present utility model;

[0022] Figure 7 It is a cross-sectional view of Embodiment 4 of the present utility model;

[0023] Figure 8 It is a cross-sectional view of Embodiment 5 of the present utility model;

[0024] Fig. 9 It is a cross-sectional view of Embodiment 6 of the present utility model;

[0025] Fig.10 It is a cross-sectional view of Embodiment 7 of the present utility model;

[0026] Fig.11 This is a cross-sectional view of Example 8 of the utility model, in which a special-shaped wound battery core is arranged in a battery shell body.

[0027] [Explanation of the accompanying drawings] 1. Positive electrode plate; 2. Diaphragm; 3. Negative electrode plate; 4. Starting end; 5. Ending end; 6. Step; 7. Slope; 8. Arc; 9. Battery shell. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Example 1

[0030] See also Figure 1A special-shaped wound battery roll core comprises a positive electrode sheet 1, a separator 2 and a negative electrode sheet 3 stacked in sequence, wherein the positive electrode sheet 1 and the negative electrode sheet 3 have a starting end 4 and a tail end 5, and is characterized in that the width of the starting end 4 of the positive electrode sheet 1 and the negative electrode sheet 3 is greater than the width of the tail end 5, and the positive electrode sheet 1 and the negative electrode sheet 3 are cut at the top and / or bottom along the winding direction of the positive electrode sheet 1 and the negative electrode sheet 3, so that the positive electrode sheet 1 and the negative electrode sheet 3 are sheet structures of special shapes. Figure 2 It is a special-shaped wound battery core formed by winding a positive electrode sheet 1, a separator 2 and a negative electrode sheet 3 stacked in sequence.

[0031] See also Figure 3 , Figure 4 The positive electrode sheet 1 and the negative electrode sheet 3 are stepped at the top and / or bottom in the winding direction, and the number of steps at the top and / or bottom of the positive electrode sheet 1 and the negative electrode sheet 3 in the winding direction is at least one layer, so that the positive electrode sheet 1 and the negative electrode sheet 3 are sheet structures with special shapes, so that the battery roll core formed by winding the positive electrode sheet 1, the separator 2 and the negative electrode sheet 3 has various special shapes, so that the battery roll core can adapt to the space in the battery shell 9 of various electronic products such as Bluetooth headsets, thereby enhancing the battery life of the lithium-ion battery.

[0032] Example 2

[0033] See also Figure 5 The positive electrode sheet 1 and the negative electrode sheet 3 are provided with a stepped step 6 at the top and / or bottom in the winding direction, and a slope 7 is provided at the end of the step 6; or, the positive electrode sheet 1 and the negative electrode sheet 3 are provided with a slope 7 at the top and / or bottom in the winding direction, and a stepped step 6 is provided at the end of the slope 7, so that the positive electrode sheet 1 and the negative electrode sheet 3 are sheet structures with special shapes, so that the battery core formed by winding the positive electrode sheet 1, the separator 2 and the negative electrode sheet 3 has various special shapes, so that the battery core can adapt to the space in the battery shell 9 of various electronic products such as Bluetooth headsets, thereby enhancing the battery life of the lithium-ion battery.

[0034] Example 3

[0035] See also Figure 6 The positive electrode sheet 1 and the negative electrode sheet 3 are provided with stepped steps 6 at the top and / or bottom in the winding direction, and a plurality of slopes 7 with different slopes are provided at the end of the steps 6, so that the positive electrode sheet 1 and the negative electrode sheet 3 are sheet structures of special shapes, so that the battery roll core formed by winding the positive electrode sheet 1, the separator 2 and the negative electrode sheet 3 has various special shapes, so that the battery roll core can adapt to the space in the battery shell 9 of various electronic products such as Bluetooth headsets, thereby enhancing the battery life of the lithium-ion battery.

[0036] Example 4

[0037] See also Figure 7 The positive electrode sheet 1 and the negative electrode sheet 3 are provided with a slope 7 at the top and / or bottom in the winding direction, so that the positive electrode sheet 1 and the negative electrode sheet 3 are sheet structures of special shapes, so that the battery roll core formed by winding the positive electrode sheet 1, the separator 2 and the negative electrode sheet 3 has various special shapes, so that the battery roll core can adapt to the space in the battery shell 9 of various electronic products such as Bluetooth headsets, thereby enhancing the battery life of the lithium-ion battery.

[0038] Example 5

[0039] See also Figure 8 The positive electrode sheet 1 and the negative electrode sheet 3 are provided with a plurality of slopes 7 with different slopes at the top and / or bottom in the winding direction, so that the positive electrode sheet 1 and the negative electrode sheet 3 are sheet structures of special shapes, so that the battery roll core formed by winding the positive electrode sheet 1, the diaphragm 2 and the negative electrode sheet 3 has various special shapes, so that the battery roll core can adapt to the space in the battery shell 9 of various electronic products such as Bluetooth headsets, thereby enhancing the battery life of the lithium-ion battery.

[0040] Example 6

[0041] See also Fig. 9 The top and / or bottom of the positive electrode sheet 1 and the negative electrode sheet 3 in the winding direction are arc-shaped 8, so that the positive electrode sheet 1 and the negative electrode sheet 3 are sheet structures of special shapes, so that the battery roll core formed by winding the positive electrode sheet 1, the separator 2 and the negative electrode sheet 3 has various special shapes, so that the battery roll core can adapt to the space in the battery shell 9 of various electronic products such as Bluetooth headsets, thereby enhancing the battery life of the lithium-ion battery.

[0042] Example 7

[0043] See also Fig.10 The positive electrode sheet 1 and the negative electrode sheet 3 are provided with stepped steps 6 at the top and / or bottom in the winding direction, and the end of the step is an arc 8; or, the positive electrode sheet 1 and the negative electrode sheet 3 are provided with a slope 7 at the top and / or bottom in the winding direction, and the end of the slope 7 is an arc 8, so that the positive electrode sheet 1 and the negative electrode sheet 3 are sheet structures with special shapes, so that the battery roll core formed by winding the positive electrode sheet 1, the separator 2 and the negative electrode sheet 3 has various special shapes, so that the battery roll core can adapt to the space in the battery shell 9 of various electronic products such as Bluetooth headsets, thereby enhancing the battery life of the lithium-ion battery.

[0044] Example 8

[0045] See also Fig.11A lithium-ion battery using the battery core includes a battery shell 9, and also includes any of the above-described special-shaped wound battery cores, a special-shaped wound battery core is arranged in the battery shell 9, and the battery shell 9 is adapted to the shape of the special-shaped wound battery core.

[0046] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A special-shaped wound battery core, comprising a positive electrode sheet (1), a separator (2) and a negative electrode sheet (3) stacked in sequence, wherein the positive electrode sheet (1) and the negative electrode sheet (3) have a starting end (4) and a tail end (5), characterized in that: The width of the starting end (4) of the positive electrode sheet (1) and the negative electrode sheet (3) is greater than the width of the ending end (5), and the positive electrode sheet (1) and the negative electrode sheet (3) are cut at the top and / or bottom along the winding direction of the positive electrode sheet (1) and the negative electrode sheet (3), so that the positive electrode sheet (1) and the negative electrode sheet (3) are sheet-like structures of a special shape.

2. The special-shaped wound battery core according to claim 1, characterized in that: The top and / or bottom of the positive electrode sheet (1) and the negative electrode sheet (3) are stepped in the winding direction, and the number of steps at the top and / or bottom of the positive electrode sheet (1) and the negative electrode sheet (3) in the winding direction is at least one layer.

3. The special-shaped wound battery core according to claim 1, characterized in that: The positive electrode sheet (1) and the negative electrode sheet (3) are provided with a stepped step (6) at the top and / or bottom in the winding direction, and a slope (7) is provided at the end of the step (6); or, The positive electrode sheet (1) and the negative electrode sheet (3) are provided with a slope (7) at the top and / or bottom in the winding direction, and a stepped step (6) is provided at the end of the slope (7).

4. The special-shaped wound battery core according to claim 1, characterized in that: The positive electrode sheet (1) and the negative electrode sheet (3) are provided with stepped steps (6) at the top and / or bottom in the winding direction, and the ends of the steps (6) are provided with a plurality of slopes (7) with different slopes.

5. The special-shaped wound battery core according to claim 1, characterized in that: The positive electrode sheet (1) and the negative electrode sheet (3) are provided with a slope (7) at the top and / or bottom in the winding direction.

6. The special-shaped wound battery core according to claim 1, characterized in that: The positive electrode sheet (1) and the negative electrode sheet (3) are provided with a plurality of slopes (7) with different slopes at the top and / or bottom in the winding direction.

7. The special-shaped wound battery core according to claim 1, characterized in that: The top and / or bottom of the positive electrode sheet (1) and the negative electrode sheet (3) in the winding direction are arc-shaped (8).

8. The special-shaped wound battery core according to claim 1, characterized in that: The positive electrode sheet (1) and the negative electrode sheet (3) are provided with a stepped step (6) at the top and / or bottom in the winding direction, and the end of the step is an arc (8); or, The positive electrode sheet (1) and the negative electrode sheet (3) are provided with a slope (7) at the top and / or bottom in the winding direction, and the end of the slope (7) is arc-shaped (8).

9. A lithium-ion battery using the battery coil core, comprising a battery shell (9), characterized in that: It also includes a special-shaped wound battery core as described in any one of claims 1 to 8, wherein the special-shaped wound battery core is arranged in a battery shell body (9), and the battery shell body (9) is adapted to the shape of the special-shaped wound battery core.