Novel battery cell liquid supplementing structure
By designing a boss and sealing groove on the top cover of the battery cell, and using the method of inserting a sealing component and milling a sealing sheet, the problem of the battery cell's liquid filling port protruding after replenishment is solved. This simplifies the battery cell maintenance process, reduces the need for replacing parts, and improves ease of use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAOGAN CORNEX NEW ENERGY INNOVATION TECHNOLOGY CO LTD
- Filing Date
- 2025-05-28
- Publication Date
- 2026-04-28
AI Technical Summary
In existing technologies, adding liquid through the cell's filling port can easily cause unexpected bulges, leading to the need to replace other components of the cell, which increases maintenance costs and complexity.
A novel battery cell electrolyte replenishment structure was designed, including a battery cell top cover and a sealing plate. By setting a boss and a sealing groove on the top cover, and using the sealing element insertion and milling of the sealing plate to achieve sealing, the accidental bulging of the electrolyte inlet is avoided, and the electrolyte replenishment process can be realized without replacing other parts.
This technology prevents the injection port from bulging during the replenishment process, simplifies the cell maintenance process, reduces the need for replacement parts, and improves the ease of use and maintenance efficiency of the cells.
Smart Images
Figure CN224177552U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery cell technology, and in particular to a novel battery cell electrolyte replenishment structure. Background Technology
[0002] The battery cell is the core component of an energy storage device, mainly composed of a positive electrode, a negative electrode, an electrolyte, a separator, and a casing. The electrolyte in the battery cell, as the medium for ion transport, directly affects the cell's performance, safety, and lifespan.
[0003] Currently, commercially available energy storage cells experience gradual electrolyte depletion over prolonged use. This leads to two main issues: firstly, reduced lithium-ion insertion / extraction efficiency, resulting in decreased usable capacity, shortened battery life or storage time, and potentially inability to meet system requirements; secondly, insufficient electrolyte causes uneven lithium-ion distribution, especially at the negative electrode surface where severe localized polarization can lead to lithium dendrite formation, potentially puncturing the separator and causing internal short circuits. Therefore, energy storage cells require electrolyte replenishment after a certain period of use to extend cell lifespan and reduce replacement costs.
[0004] Utility model patent CN216354670U discloses a battery cell electrolyte replenishment device, which includes a frame, a support platform, a housing, and a lifting mechanism. The support platform is mounted on the frame and is used to support the battery cell to be replenished. The housing has a hollow structure with an open bottom, forming a cavity. The housing has a first through hole for connecting a vacuum pump and a second through hole for connecting a nitrogen injection device. The lifting mechanism is connected to the housing and is used to drive the housing to move up and down vertically. When the housing descends vertically onto the support platform, the bottom end of the housing is sealed against the support platform. Conventionally, when replenishing electrolyte in battery cells, electrolyte is usually injected directly into the electrolyte inlet on the top cover of the cell using an external electrolyte replenishment device. However, when replenishing electrolyte through the electrolyte inlet on the top cover, the process parameters for the secondary sealing may differ from those for the initial sealing. This can lead to unexpected bulges at the electrolyte inlet, which in turn requires the replacement of other components in the replenished battery cell after the electrolyte replenishment is completed. Therefore, this solution proposes a novel battery cell electrolyte replenishment structure to address the above problems. Utility Model Content
[0005] In view of this, the present invention proposes a novel battery cell replenishment structure to solve the technical problem that after replenishment through the injection port, an unexpected bulge may occur at the injection port, which would lead to the need to replace other parts of the replenished battery cell after replenishment.
[0006] The technical solution of this utility model is achieved as follows: This utility model provides a novel battery cell electrolyte replenishment structure, including a battery cell top cover and a sealing sheet for sealing the battery cell, wherein,
[0007] The top cover of the battery cell is provided with an injection port and a replenishment port. The replenishment port is used for the insertion and sealing connection of the sealing element. A boss is formed on the top cover of the battery cell, and the replenishment port is located on the inner side of the boss. A sealing groove is provided on the inner side of the boss.
[0008] A sealing sheet is disposed inside the sealing groove and is sealed to the boss, thereby blocking the liquid inlet.
[0009] Based on the above technical solutions, preferably, the top cover of the battery cell is also provided with a sealing groove, and the liquid replenishment port is located inside the sealing groove.
[0010] Based on the above technical solutions, preferably, the sidewall of the sealing groove is an inclined wall.
[0011] Based on the above technical solutions, preferably, the top cover of the battery cell is further provided with a first clearance groove, and the sealing groove is provided on the inner side of the first clearance groove.
[0012] Based on the above technical solutions, preferably, it also includes a first sealing adhesive particle, wherein,
[0013] The first sealing granule includes a sealing plug and a sealing cap that are fixedly connected to each other. The sealing plug is inserted into the inside of the liquid inlet and is sealed and fitted to the liquid inlet. The sealing cap is inserted into the inside of the sealing groove.
[0014] Based on the above technical solutions, preferably, the side wall of the sealing cap is an inclined wall, and the side wall of the sealing cap is sealed and fitted with the side wall of the sealing groove.
[0015] Based on the above technical solutions, preferably, it also includes a second sealing compound and a sealing aluminum sheet, wherein,
[0016] The second sealing granule is inserted into the inside of the liquid inlet and is sealed to the liquid inlet.
[0017] A sealing aluminum sheet is inserted into the interior of the sealing groove, and the sealing aluminum sheet includes a side-inclined portion, which is sealed to the side wall of the sealing groove.
[0018] Based on the above technical solutions, preferably, a reinforcing groove is formed between the middle part of the sealing aluminum sheet and the lateral inclined part.
[0019] Based on the above technical solutions, preferably, a second clearance groove is provided on the side of the sealing aluminum sheet near the second sealing particle.
[0020] Based on the above technical solutions, preferably, a top insulating sheet is also included, wherein...
[0021] A top insulating sheet is attached to the top cover of the battery cell, and the top insulating sheet has a contoured protrusion, with the protrusion located inside the contoured protrusion.
[0022] The novel battery cell electrolyte replenishment structure of this invention has the following advantages over the prior art:
[0023] By inserting a sealing element into the inside of the fluid inlet, the fluid inlet is sealed. Specifically, when fluid needs to be added to the battery cell, the sealing sheet can be removed by milling using CNC machining or other methods. At this point, the sealing element can be removed from the inside of the fluid inlet, and the fluid inlet is used to add fluid to the battery cell. In this fluid inlet structure, since only the sealing sheet needs to be milled during fluid inlet addition, and the sealing sheet is located inside the boss, milling the sealing sheet will not cause any unexpected bulges on the top cover of the battery cell. Therefore, there is no need to replace other parts of the battery cell after fluid inlet addition, making it convenient to use. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Fig. 1 This is an exploded schematic diagram of the novel battery cell electrolyte replenishment structure of this utility model;
[0026] Fig. 2 This is a partial cross-sectional view of the novel battery cell electrolyte replenishment structure of this utility model before electrolyte injection;
[0027] Fig. 3 This is a partial cross-sectional view of the novel battery cell replenishment structure of this utility model after liquid injection.
[0028] In the diagram: 1. Top cover of the battery cell; 11. Injection port; 12. Replenishment port; 13. Sealing groove; 14. First clearance groove; 15. Boss; 151. Cover groove; 2. First sealing granule; 21. Sealing insertion part; 22. Sealing cap; 3. Sealing sheet; 6. Top insulating sheet; 61. Contouring protrusion; 4. Second sealing granule; 5. Sealing aluminum sheet; 51. Lateral tilting part; 52. Reinforcing groove; 53. Second clearance groove. Detailed Implementation
[0029] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.
[0030] like Figs. 1-3 As shown, the novel battery cell fluid replenishment structure of this utility model includes a battery cell top cover 1 and a sealing plate 3 for sealing the battery cell. The battery cell top cover 1 has an injection port 11 and a replenishment port 12. The replenishment port 12 is used for the insertion and sealing connection of the sealing element. A boss 15 is formed on the battery cell top cover 1, and the replenishment port 12 is opened on the inner side of the boss 15. A sealing groove 151 is opened on the inner side of the boss 15. The sealing plate 3 is disposed inside the sealing groove 151 and is sealed to the boss 15. The sealing plate 3 seals the replenishment port 12.
[0031] In practice, the injection port 11 and the replenishment port 12 are respectively located on both sides of the top cover 1 of the battery cell. The boss 15 and the sealing plate 3 are both circular. The sealing element that seals the replenishment port 12 can be a sealing granule.
[0032] In practice, the sealing element is inserted into the inside of the liquid replenishment port 12 to seal the port. Then, the sealing plate 3 is welded into the inside of the sealing groove 151 to completely seal the liquid replenishment port 12 and prevent the sealing element from accidentally detaching from the port, thus improving the sealing effect. Specifically, when liquid replenishment is needed for the battery cell, the sealing plate 3 can be removed by milling using CNC machining or other methods. At this time, the sealing element can be removed from the inside of the liquid replenishment port 12, and the liquid replenishment of the battery cell can be completed through the port 12.
[0033] The electrolyte replenishment structure of this application only requires milling the sealing plate 3 during electrolyte replenishment. Since the sealing plate 3 is located inside the boss 15, milling the sealing plate 3 will not cause any unexpected protrusions on the cell top cover 1. Therefore, it is not necessary to replace other parts of the replenished cell after electrolyte replenishment, making it convenient to use.
[0034] like Figs. 2-3 As shown, in a preferred embodiment, the top cover 1 of the battery cell is also provided with a sealing groove 13, and the liquid inlet 12 is provided on the inner side of the sealing groove 13.
[0035] With this design, when the liquid inlet 12 is sealed by the sealing element, the sealing mating groove 13 can be sealed simultaneously. Since the liquid inlet 12 is located inside the sealing mating groove 13, the sealing effect of the liquid inlet 12 can be increased.
[0036] The sidewall of the sealing groove 13 is an inclined wall.
[0037] The top cover 1 of the battery cell is also provided with a first clearance groove 14, and the sealing groove 13 is provided inside the first clearance groove 14.
[0038] The design of the first clearance groove 14 is mainly for facilitating the assembly and disassembly of the components at the liquid replenishment port 12.
[0039] like Fig. 2 As shown, as an embodiment before replenishment, it also includes a first sealing granule 2, wherein the first sealing granule 2 includes a sealing plug 21 and a sealing cap 22 that are fixedly connected to each other. The sealing plug 21 is inserted into the inside of the replenishment port 12 and is sealed and fitted to the replenishment port 12. The sealing cap 22 is inserted into the inside of the sealing mating groove 13.
[0040] The side wall of the sealing cap 22 is an inclined wall, and the side wall of the sealing cap 22 is sealed and fitted with the side wall of the sealing groove 13.
[0041] In practice, both the sealing cap 22 and the sealing connector 21 are circular.
[0042] In practice, the sealing sheet 3 abuts against the sealing cap 22. This design, under the action of the first sealing rubber granule 2, prevents the electrolyte from overflowing into the replenishment port 12 due to external vibrations or other factors during use, thus preventing contamination of the replenishment port 12. By setting the sealing sheet 3 to abut against the sealing cap 22, the first sealing rubber granule 2 is prevented from falling off into the battery cell after prolonged use, and is also prevented from becoming loose.
[0043] Since the side wall of the sealing cap 22 is an inclined wall, and the side wall of the sealing cap 22 is sealed and fitted with the side wall of the sealing groove 13, when the sealing sheet 3 is milled, the sealing and shielding effect of the sealing cap 22 can ensure that the metal chips generated during the milling process cannot contaminate the liquid inlet 12.
[0044] Preferably, the sidewall of the sealing connector 21 may be provided with a protrusion. This design can be used to prevent the first sealing particle 2 from being mistakenly connected, while also increasing the sealing line between the first sealing particle 2 and the liquid replenishment port 12.
[0045] like Fig. 3 As shown, in one embodiment after replenishment, it also includes a second sealing granule 4 and a sealing aluminum sheet 5. The second sealing granule 4 is inserted into the inside of the replenishment port 12 and is sealed to the replenishment port 12. The sealing aluminum sheet 5 is inserted into the inside of the sealing mating groove 13, and the sealing aluminum sheet 5 includes a side inclined portion 51, which is sealed to the side wall of the sealing mating groove 13.
[0046] A reinforcing groove 52 is formed between the middle part of the sealing aluminum sheet 5 and the lateral inclined part 51.
[0047] This design is used to increase the structural strength of the sealing aluminum sheet 5.
[0048] A second clearance groove 53 is provided on the side of the sealing aluminum sheet 5 near the second sealing rubber particle 4.
[0049] In specific implementation, the first clearance groove 14 is designed to avoid the sealing cap 22 and the sealing aluminum sheet 5, and the second clearance groove 53 is designed to avoid the second sealing rubber particle 4.
[0050] like Figs. 2-3 As shown, in a preferred embodiment, it also includes a top insulating sheet 6, wherein the top insulating sheet 6 is connected to the top cover 1 of the battery cell, and the top insulating sheet 6 has a contoured protrusion 61, with the boss 15 located inside the contoured protrusion 61.
[0051] By setting the top insulating sheet 6 to cover the boss 15, the boss 15 is shielded and protected. At the same time, the integrity of the top cover structure of this application is increased, so that the appearance of the top plate is consistent before and after liquid replenishment, which is convenient for use.
[0052] The working principle of this utility model is described below:
[0053] When liquid replenishment is required, the sealing sheet 3 is milled off and the first sealing granule 2 is removed. Liquid replenishment of the battery cell is then completed through the liquid replenishment port 12. After liquid replenishment, the second sealing granule 4 is used for initial sealing. Then, the liquid replenishment port 12 is resealed by inserting the sealing aluminum sheet 5 into the sealing mating groove 13.
[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A novel battery cell electrolyte replenishment structure, characterized in that: Includes a cell top cover (1) and a sealing sheet (3) for sealing the battery cell, wherein, The top cover (1) of the battery cell is provided with an injection port (11) and a replenishment port (12). The replenishment port (12) is used for the insertion and sealing connection of the sealing element. A boss (15) is formed on the top cover (1), and the replenishment port (12) is opened on the inner side of the boss (15). A sealing groove (151) is opened on the inner side of the boss (15). A sealing sheet (3) is disposed inside the sealing groove (151) and is sealed to the boss (15). The sealing sheet (3) blocks the liquid replenishment port (12).
2. The novel battery cell electrolyte replenishment structure as described in claim 1, characterized in that: The top cover (1) of the battery cell is also provided with a sealing groove (13), and the liquid replenishment port (12) is located inside the sealing groove (13).
3. The novel battery cell electrolyte replenishment structure as described in claim 2, characterized in that: The sidewall of the sealing groove (13) is an inclined wall.
4. The novel battery cell electrolyte replenishment structure as described in claim 2, characterized in that: The top cover (1) of the battery cell is also provided with a first clearance groove (14), and the sealing groove (13) is provided on the inner side of the first clearance groove (14).
5. The novel battery cell electrolyte replenishment structure as described in claim 4, characterized in that: It also includes a first sealing compound (2), wherein, The first sealing granule (2) includes a sealing plug (21) and a sealing cap (22) that are fixedly connected to each other. The sealing plug (21) is inserted into the inside of the liquid inlet (12) and is sealed and fitted to the liquid inlet (12). The sealing cap (22) is inserted into the inside of the sealing mating groove (13).
6. The novel battery cell electrolyte replenishment structure as described in claim 5, characterized in that: The side wall of the sealing cap (22) is an inclined wall, and the side wall of the sealing cap (22) is sealed and fitted with the side wall of the sealing groove (13).
7. The novel battery cell electrolyte replenishment structure as described in claim 2, characterized in that: It also includes a second sealing compound (4) and a sealing aluminum sheet (5), wherein, The second sealing granule (4) is inserted into the inside of the liquid inlet (12) and is sealed to the liquid inlet (12); A sealing aluminum sheet (5) is inserted into the inside of the sealing groove (13), and the sealing aluminum sheet (5) includes a side-inclined portion (51), which is sealed to the side wall of the sealing groove (13).
8. The novel cell electrolyte replenishment structure as described in claim 7, characterized in that: A reinforcing groove (52) is formed between the middle part of the sealing aluminum sheet (5) and the lateral inclined part (51).
9. The novel cell electrolyte replenishment structure as described in claim 8, characterized in that: The sealing aluminum sheet (5) has a second clearance groove (53) on the side near the second sealing granule (4).
10. The novel cell electrolyte replenishment structure as described in claim 1, characterized in that: It also includes a top insulating sheet (6), wherein, A top insulating sheet (6) is connected to the top cover (1) of the battery cell, and the top insulating sheet (6) has a contoured protrusion (61), with the boss (15) located inside the contoured protrusion (61).