Central needle for improving battery infiltration effect and battery cell
By designing a central needle to improve battery wetting, and utilizing a funnel-shaped hole structure and double pressurization technology, the problem of poor electrolyte wetting inside the cylindrical cell was solved, resulting in a reduction in battery manufacturing time and energy consumption.
Patent Information
- Application Number
- CN202520112463.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-01-17
AI Technical Summary
In existing lithium-ion battery manufacturing processes, the electrolyte does not effectively wet the inside of cylindrical cells, leading to extended manufacturing time and increased costs.
A central needle for improving battery wetting is designed, comprising a hollow syringe and a sealed end cap, with a flared inlet and outlet, and the absorption efficiency of the electrolyte is improved by applying pressure twice.
It significantly improves the liquid absorption effect of the core, reduces battery manufacturing time, and lowers production energy consumption.
Smart Images
Figure CN223941980U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium-ion battery production technology, specifically to a center needle and battery cell for improving battery wetting effect. Background Technology
[0002] Lithium-ion batteries are widely used in daily life, and cylindrical batteries are developing rapidly. The diameter of the battery cells is also getting larger and larger. In order to meet the capacity requirements, the internal margin of the battery is getting larger and larger. The two ends of the battery cell are positive and negative electrode foils, which reduces the internal space. The foils cannot conduct electrolyte, which poses a great challenge to the electrolyte wetting of the battery. Existing processes address the battery wetting problem by using negative pressure for electrolyte injection, positive pressure for electrolyte injection, high temperature rest time, and low current formation.
[0003] However, the above process greatly increases the manufacturing time of cylindrical cells. The liquid injection time, high-temperature resting time, and low-current conversion all increase the cell manufacturing time and also increase the manufacturing cost. The increased time requires more equipment to meet the production capacity, which increases equipment costs. Utility Model Content
[0004] The purpose of this invention is to address the shortcomings of the aforementioned technologies by providing a center needle and battery cell that improves battery wetting effect, significantly enhances the liquid absorption effect of the core, reduces battery manufacturing time, and lowers production energy consumption.
[0005] To achieve the above objectives, the central needle designed in this utility model for improving battery wetting effect includes a needle body. The needle body includes a hollow syringe and an upper end cap and a lower end cap that seal the two ends of the syringe. The upper end cap has several liquid inlet holes, the lower end cap has several liquid outlet holes, and the syringe wall has several liquid outlet holes.
[0006] Preferably, the liquid inlet is funnel-shaped, with the cross-sectional area of the liquid inlet end being larger than that of the liquid outlet end, thereby increasing the internal pressure of the central needle.
[0007] Preferably, the liquid outlet is funnel-shaped, with the cross-sectional area of the liquid inlet end being larger than that of the liquid outlet end, thereby increasing the pressure of the liquid being sprayed outward.
[0008] Preferably, the liquid inlet holes on the upper end cover are evenly distributed in a ring shape, making the liquid spraying more uniform.
[0009] Preferably, the liquid outlet holes on the lower end cap are evenly distributed in a ring shape, making the liquid spraying more uniform.
[0010] Preferably, the syringe has a ring of liquid outlet holes on its periphery, which are evenly distributed on the periphery of the syringe to make the liquid spray more uniform.
[0011] Preferably, the ratio of the cross-sectional area of the inlet end to the outlet end of the liquid inlet is adjustable to adapt to different pressure requirements.
[0012] Preferably, the ratio of the cross-sectional area of the liquid inlet end to the liquid outlet end is adjustable to adapt to different pressure requirements.
[0013] Preferably, the size of the liquid inlet is larger than the size of the liquid outlet.
[0014] A type of battery cell, after being wound, flattened, housed, and welded to the current collector, is inserted into a central needle. The liquid inlet of the central needle faces the liquid injection position for liquid injection. In subsequent liquid injection processes, when liquid is injected through the liquid inlet, the outward expansion of the central needle's liquid inlet can increase the internal pressure of the central needle. When the electrolyte inside the central needle is sprayed outward, the inward expansion and outward contraction of the liquid outlet of the central needle's cylinder wall and the lower end cap of the central needle can increase the pressure of the sprayed liquid. The two pressurizations can better absorb the electrolyte. The pressurization is achieved by using different sizes of the expansion and contraction.
[0015] Compared with the prior art, this utility model has the following advantages:
[0016] 1. Adding intermediate pins to cylindrical cells significantly improves the liquid absorption effect of the core, reduces battery manufacturing time, and lowers production energy consumption;
[0017] 2. Two pressurization processes allow for better absorption of the electrolyte, and the pressurization is achieved by using different sizes of the flare and constriction. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of the central needle for improving battery wetting effect according to this utility model;
[0019] Figure 2 for Figure 1 Schematic diagram of the upper and middle end caps;
[0020] Figure 3 for Figure 1 Schematic diagram of the central liquid inlet hole;
[0021] Figure 4 for Figure 1 Schematic diagram of the lower end cap;
[0022] Figure 5 for Figure 1 A schematic diagram of the liquid outlet hole.
[0023] Explanation of reference numerals in the attached figures:
[0024] 1-Needle body, 2-Syringe, 3-Upper cap, 4-Lower cap, 5-Inlet hole, 6-Outlet hole. Detailed Implementation
[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0027] 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.
[0028] Example 1
[0029] like Figure 1 As shown, a central needle for improving battery wetting effect includes a needle body 1. The needle body 1 includes a needle barrel 2 with a hollow internal structure, and an upper end cap 3 and a lower end cap 4 that are provided at both ends of the needle barrel 2 to seal it. The upper end cap 3 is provided with a plurality of liquid inlet holes 5, and the lower end cap 4 is provided with a plurality of liquid outlet holes 6. The periphery of the needle barrel 2 is provided with a plurality of liquid outlet holes 6.
[0030] A type of battery cell, after being wound, flattened, inserted into the casing and welded to the current collector, is inserted into a center pin. The liquid inlet hole 5 of the center pin faces the liquid injection position for liquid injection.
[0031] Example 2
[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, a central needle for improving battery wetting effect includes a needle body 1. The needle body 1 includes a needle barrel 2 with a hollow internal structure, and an upper end cap 3 and a lower end cap 4 that are provided at both ends of the needle barrel 2 to seal it. The upper end cap 3 is provided with a plurality of liquid inlet holes 5, and the lower end cap 4 is provided with a plurality of liquid outlet holes 6. The periphery of the needle barrel 2 is provided with a plurality of liquid outlet holes 6.
[0033] Among them, the liquid inlet 5 is funnel-shaped, and the cross-sectional area of its liquid inlet end is larger than the cross-sectional area of its liquid outlet end; the liquid outlet 6 is funnel-shaped, and the cross-sectional area of its liquid inlet end is larger than the cross-sectional area of its liquid outlet end.
[0034] A type of battery cell, after being wound, flattened, housed, and welded to the current collector, is inserted into a central needle. The liquid inlet 5 of the central needle faces the liquid injection position for liquid injection. In subsequent liquid injection processes, when liquid is injected through the liquid inlet 5, the outward expansion of the central needle liquid inlet 5 can increase the internal pressure of the central needle. When the electrolyte inside the central needle is sprayed outward, the inward expansion and outward contraction of the liquid outlet 6 of the central needle syringe 2 and the lower end cap 4 of the central needle can increase the pressure of the liquid sprayed outward. The two pressurizations can better absorb the electrolyte. The pressurization is achieved by using different sizes of the expansion and contraction.
[0035] Example 3
[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a central needle for improving battery wetting effect includes a needle body 1. The needle body 1 includes a needle barrel 2 with a hollow internal structure, and an upper end cap 3 and a lower end cap 4 that are provided at both ends of the needle barrel 2 to seal it. The upper end cap 3 is provided with a plurality of liquid inlet holes 5, and the lower end cap 4 is provided with a plurality of liquid outlet holes 6. The periphery of the needle barrel 2 is provided with a plurality of liquid outlet holes 6.
[0037] Among them, the liquid inlet 5 is funnel-shaped, and the cross-sectional area of its liquid inlet end is larger than the cross-sectional area of its liquid outlet end; the liquid outlet 6 is funnel-shaped, and the cross-sectional area of its liquid inlet end is larger than the cross-sectional area of its liquid outlet end.
[0038] Among them, the liquid inlet holes 5 on the upper end cap 3 are evenly distributed in a ring, the liquid outlet holes 6 on the lower end cap 4 are evenly distributed in a ring, and the wall of the syringe 2 is provided with a ring of liquid outlet holes 6, which are evenly distributed on the wall of the syringe 2.
[0039] A type of battery cell, after being wound, flattened, housed, and welded to the current collector, is inserted into a central needle. The liquid inlet 5 of the central needle faces the liquid injection position for liquid injection. In subsequent liquid injection processes, when liquid is injected through the liquid inlet 5, the outward expansion of the central needle liquid inlet 5 can increase the internal pressure of the central needle. When the electrolyte inside the central needle is sprayed outward, the inward expansion and outward contraction of the liquid outlet 6 of the central needle syringe 2 and the lower end cap 4 of the central needle can increase the pressure of the liquid sprayed outward. The two pressurizations can better absorb the electrolyte. The pressurization is achieved by using different sizes of the expansion and contraction.
[0040] In addition, different pressure requirements can be adapted by adjusting the ratio of the cross-sectional area of the inlet end to the outlet end of the inlet hole 5 and the ratio of the cross-sectional area of the inlet end to the outlet end of the outlet hole 6.
[0041] To further increase the injection pressure, the size of the inlet hole 5 can be made larger than the size of the outlet hole 6.
[0042] This invention improves the battery wetting effect with a center needle and battery cell, significantly enhancing the liquid absorption effect of the core, reducing battery manufacturing time, and lowering production energy consumption; the double pressurization allows for better absorption of the electrolyte, and the pressurization is achieved by utilizing different sizes of the flaring and constriction.
[0043] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this utility model is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this utility model are defined only by the scope of the claims.
[0044] The shapes, dimensions, ratios, angles, and figures disclosed in the description of various aspects of this specification and claims are merely examples, and therefore, this specification and claims are not limited to the details shown. In the following description, detailed descriptions of relevant known functions or configurations will be omitted where it would be determined that they unnecessarily obscure the focus of this specification and claims.
[0045] When using the terms “comprising,” “having,” and “including” as described in this specification, there may be another part or other part unless used, and the terms used are generally singular but may also be plural.
[0046] It should be noted that although various components may appear and be described in this specification using terms such as "first," "second," "top," "bottom," "one side," "the other side," "one end," "the other end," etc., these components and parts should not be limited by these terms. These terms are only used to distinguish one component and part from another. For example, without departing from the scope of this specification, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component; top and bottom components may, under certain circumstances, be interchanged or converted; and components at one end and the other end may have the same or different performance characteristics.
[0047] When describing positional relationships, for example, when the positional order is described as "on," "above," "below," and "next," situations where they are not in contact or are in contact may be included, unless words or terms such as "exactly" or "directly" are used. If it is mentioned that the first element is "on" the second element, it does not mean that the first element must be above the second element in the drawing. The upper and lower parts of the components will change depending on the viewing angle and orientation. Therefore, in the drawings or in the actual construction, situations where the first element is "on" the second element can include situations where the first element is "below" the second element and situations where the first element is "above" the second element. When describing temporal relationships, situations where the steps are not consecutive may be included when describing "after," "following," "subsequently," and "before," unless "exactly" or "directly" is used. Features of various embodiments of this invention can be combined or spliced together in part or in whole, and can be implemented in various different configurations as will be fully understood by those skilled in the art. Embodiments of this invention can be implemented independently of each other or together in an interdependent relationship.
[0048] Finally, it should be noted that the above embodiments are merely representative examples of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model should be considered to fall within the protection scope of this utility model.
Claims
1. A center needle for improving battery wetting effect, comprising a needle body (1), characterized in that: The needle body (1) includes a hollow syringe (2) and an upper end cap (3) and a lower end cap (4) that seal the two ends of the syringe (2). The upper end cap (3) has several inlet holes (5), and the lower end cap (4) has several outlet holes (6). The syringe (2) has several outlet holes (6) on its periphery.
2. The center needle for improving battery wetting effect as described in claim 1, characterized in that: The liquid inlet (5) is trumpet-shaped, and the cross-sectional area of its liquid inlet end is larger than the cross-sectional area of its liquid outlet end.
3. The center needle for improving battery wetting effect as described in claim 1, characterized in that: The liquid outlet (6) is trumpet-shaped, and the cross-sectional area of its inlet end is larger than the cross-sectional area of its outlet end.
4. The center needle for improving battery wetting effect as described in claim 1, characterized in that: The liquid inlet holes (5) on the upper end cap (3) are evenly distributed in a ring.
5. The center needle for improving battery wetting effect as described in claim 1, characterized in that: The liquid outlet holes (6) on the lower end cap (4) are evenly distributed in a ring.
6. The center needle for improving battery wetting effect as described in claim 1, characterized in that: The syringe (2) has a ring of liquid outlet holes (6) on its periphery, which are evenly distributed on the periphery of the syringe (2).
7. The center needle for improving battery wetting effect as described in claim 2, characterized in that: The ratio of the cross-sectional area of the inlet end to the outlet end of the liquid inlet hole (5) is adjustable.
8. The center needle for improving battery wetting effect as described in claim 3, characterized in that: The ratio of the cross-sectional area of the liquid inlet end to the liquid outlet end of the liquid outlet (6) is adjustable.
9. The center needle for improving battery wetting effect as described in claim 1, characterized in that: The size of the inlet hole (5) is larger than the size of the outlet hole (6).
10. A battery cell, characterized in that: After the battery cell is wound, flattened, inserted into the casing and welded to the collector plate, it is inserted into the center needle as described in any one of claims 1 to 9, with the liquid inlet hole (5) of the center needle facing the liquid injection position for liquid injection.