A separator structure, a cover plate assembly, and a battery

Abstract

This utility model relates to the field of battery technology and discloses a separator structure, a cover plate assembly, and a battery. The separator structure is installed below an end cap and includes a fixing frame with an upwardly extending protrusion on its inner wall; a disc body with both ends connected to the inner walls of the protrusion; a hollow section formed between the two sides of the disc body and the protrusion; and transverse reinforcing columns connected to both sides of the disc body, forming a cavity between the transverse reinforcing columns and the bottom surface of the disc body. The fixing frame, protrusion, disc body, and transverse reinforcing columns are integrally formed. This separator structure effectively reduces the space occupied within the battery casing without reducing its strength or increasing the battery volume, allowing for the injection of sufficient electrolyte and improving battery stability and safety.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a separator structure, a cover plate assembly, and a battery. Background Technology

[0002] Lithium batteries are a type of battery with high capacity, long cycle life, and wide operating temperature range. Lithium batteries are typically composed of several major parts, including cover components (end caps, terminals, and separators), battery casing, core, and electrolyte. With the development of the new energy industry, higher requirements have been placed on the energy density, cycle life, safety, and reliability of lithium batteries.

[0003] The core role of the electrolyte in a lithium-ion battery is to conduct lithium ions, enabling the electrochemical processes of lithium delithiation and insertion between the positive and negative electrodes. During charging, lithium ions are released from the positive electrode material, migrate through the electrolyte to the negative electrode, and intercalate there, forming lithium compounds to store electrical energy. During discharging, lithium ions are released from the negative electrode material, migrate back to the positive electrode through the electrolyte, and release energy for use by external devices. In other words, the electrolyte plays a crucial role in the cycle life, rate performance, high and low temperature performance, safety performance, and capacity utilization of lithium-ion batteries.

[0004] In existing technologies, the separator is a single, disc-shaped structure that is sealed between the end cap and the battery cell for insulation. This separator structure occupies a large space inside the battery casing. Therefore, without increasing the battery volume, the amount of electrolyte injected into the battery casing is relatively small, which ultimately affects the stability and safety of the battery. Utility Model Content

[0005] Based on the above, the purpose of this utility model is to provide a separator structure, a cover plate assembly, and a battery to solve the problem that the separator structure in the prior art occupies a large space in the battery casing, resulting in insufficient electrolyte injection and affecting the stability and safety of the battery.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This utility model provides an isolation plate structure, which is installed below an end cap. The isolation plate structure includes:

[0008] A fixed frame, wherein a protrusion extends upward on the inner wall of the fixed frame;

[0009] The disc body has its two ends connected to the inner wall of the protrusion, and a hollow part is formed between the two sides of the disc body and the protrusion. A transverse reinforcing column is connected to the two sides of the disc body, and an air-proof cavity is formed between the transverse reinforcing column and the bottom surface of the disc body.

[0010] The fixing frame, protrusion, disc and transverse reinforcing column are integrally formed.

[0011] As an optional technical solution for the isolation plate structure, longitudinal reinforcing columns are connected between the two sides of the disk and the protrusion.

[0012] As an optional technical solution for the isolation plate structure, the transverse reinforcing column is provided with a support column along the bottom surface of the disk.

[0013] On the other hand, this utility model also provides a cover plate assembly, including an end cap, an electrode post, and the aforementioned isolation plate structure. The end cap is provided with a clearance hole, and the disc body is provided with a mounting hole. The bottom end of the electrode post is engaged in the mounting hole, and its top end extends through the clearance hole to the top of the end cap. The outer diameter of the electrode post is provided with an annular stop portion integrally formed therewith. The upper end surface of the annular stop portion is provided with an insulating sealant layer. The end cap is insulated and sealed to the electrode post through the insulating sealant layer.

[0014] As an optional technical solution for the cover plate assembly, the bottom edge of the pole post has a chamfered structure, and an annular snap-fit ​​groove is provided between the annular stop portion and the bottom end of the pole post. The isolation plate structure is snapped into the annular snap-fit ​​groove through the mounting hole.

[0015] As an optional technical solution for the cover plate assembly, the end cover is provided with a first through hole, a protective cover is installed on the first through hole, and a pressure relief hole is provided on the protective cover; the disc body is provided with a second through hole, an explosion-proof valve is installed on the second through hole, and the first through hole and the second through hole are coaxially arranged.

[0016] As an optional technical solution for the cover plate assembly, the end cap and the disc body are provided with coaxial upper and lower liquid injection holes, and a sealing pin is installed at the entrance of the upper liquid injection hole.

[0017] As an optional technical solution for the cover plate assembly, the inner wall of the upper injection hole and the outer wall of the sealing pin are respectively conical; the bottom of the outer circumference of the end cap is provided with a step, and the diameter of the isolation plate structure is smaller than the diameter of the end cap.

[0018] As an optional technical solution for the cover plate assembly, a busbar is connected to the bottom end of the pole.

[0019] Thirdly, this utility model also provides a battery, including a casing, a battery cell, and the aforementioned cover assembly, wherein the cover assembly is encapsulated at the opening of the casing and forms a receiving cavity, and the battery cell is disposed in the receiving cavity.

[0020] The beneficial effects of this utility model are as follows:

[0021] This utility model provides an isolation plate structure, which is installed below an end cap and includes: a fixing frame with an upwardly extending protrusion on the inner wall of the fixing frame; a disc body with its two ends connected to the inner wall of the protrusion, a hollow section formed between the two sides of the disc body and the protrusion, and transverse reinforcing columns connected to the two sides of the disc body, forming a cavity between the transverse reinforcing columns and the bottom surface of the disc body; wherein, the fixing frame, the protrusion, the disc body and the transverse reinforcing columns are integrally formed.

[0022] Under the above structure, on the one hand, the hollow structure between the disc and the protrusion can save some space inside the battery casing; on the other hand, the cavity at the bottom of the disc can also save some space inside the battery. In other words, the formation of the cavity allows the bottom of the terminal post and the current collector connected to the bottom of the terminal post to be placed inside the cavity, further reducing the space occupied inside the battery casing. Among them, the protrusion and the transverse reinforcing post provide strong stability for the entire separator structure. Therefore, this separator structure can effectively reduce the space occupied inside the battery casing without reducing its strength or increasing the battery volume, allowing the battery to be injected with sufficient electrolyte, thus improving the stability and safety of the battery. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the isolation plate in Embodiment 1 of this utility model;

[0024] Figure 2 This is a bottom view of the isolation plate structure in Embodiment 1 of this utility model;

[0025] Figure 3 This is a schematic diagram of the overall structure of the cover plate assembly in Embodiment 2 of this utility model;

[0026] Figure 4 This is an exploded view of the cover plate assembly in Embodiment 2 of this utility model;

[0027] Figure 5 This is a cross-sectional schematic diagram of the cover plate assembly in Embodiment 2 of this utility model;

[0028] Figure 6 This is a schematic diagram of the overall structure of the battery in Embodiment 3 of this utility model.

[0029] In the picture:

[0030] 1. Isolation plate structure; 10. Fixing frame; 101. Protrusion; 11. Disc body; 12. Hollowed-out part; 13. Horizontal reinforcing column; 131. Refractory cavity; 14. Longitudinal reinforcing column; 15. Support column; 16. Mounting hole; 17. Second through hole; 171. Explosion-proof valve; 18. Liquid injection hole;

[0031] 2. End cap; 20. Void hole; 21. First through hole; 22. Protective cap; 220. Pressure relief hole; 23. Upper injection hole; 24. Sealing pin; 25. Step;

[0032] 3. Terminal post; 30. Annular retaining part; 31. Insulating sealant layer; 32. Annular snap-fit ​​groove; 33. Busbar;

[0033] 4. Shell. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0035] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between 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.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0039] Example 1

[0040] like Figure 1-2 As shown, this utility model provides an isolation plate structure, which is installed below the end cap 2. It includes a fixing frame 10, with a protrusion 101 extending upward on the inner wall of the fixing frame 10; a disc body 11, with its two ends respectively connected to the inner wall of the protrusion 101; a hollow portion 12 is formed between the two sides of the disc body 11 and the protrusion 101; and transverse reinforcing columns 13 are connected to the two sides of the disc body 11, forming a cavity 131 between the transverse reinforcing columns 13 and the bottom surface of the disc body 11; wherein, the fixing frame 10, the protrusion 101, the disc body 11 and the transverse reinforcing columns 13 are integrally formed structures.

[0041] The separator structure provided by this utility model can save space inside the battery casing 4 through the hollow portion 12 structure between the disk 11 and the protrusion 101. On the other hand, the cavity 131 at the bottom of the disk 11 can also save space inside the battery. In other words, the formation of the cavity 131 allows the bottom end of the electrode post 3 and the busbar 33 connected to the bottom of the electrode post 3 to be placed inside the cavity 131, further reducing the space occupied inside the battery casing 4. Among them, the protrusion 101 and the transverse reinforcing post 13 provide strong stability for the entire separator structure 1. Therefore, the separator structure 1 can effectively reduce the space occupied inside the battery casing 4 without reducing its strength or increasing the battery volume, so that the battery can be injected with a sufficient amount of electrolyte, improving the stability and safety of the battery.

[0042] Specifically, such as Figure 1 As shown, the fixing frame 10 can be ring-shaped or rectangular, etc. In this embodiment, the fixing frame 10 is preferably ring-shaped, that is, the ring-shaped fixing frame 10 is equivalent to the overall ring shape of the separator structure 1, which can be adapted to the encapsulation of various cylindrical batteries; the protrusion 101 extends radially upward along the inner wall of the fixing frame 10, which can enhance the stability of the fixing frame 10 and prevent the fixing frame 10 from deforming, and the protrusion 101 can abut against the end cover 2 after being encapsulated at the bottom of the end cover 2, so that the entire separator can better fit the end cover 2 for encapsulation; In this embodiment, the disk 11 is an equilateral ellipse. The two ends of the disk 11 are connected to the inner wall of the protrusion 101. At the same time, a longitudinal reinforcing column 14 is connected between the two sides of the disk 11 and the protrusion 101. The longitudinal reinforcing column 14 divides the hollow part 12 into two. Under this structure, not only can four equal hollow parts 12 be divided on the separator structure 1, but its overall strength is also enhanced, effectively providing more usable space inside the battery. Sufficient electrolyte can be injected into the battery, improving the stability and safety of the battery.

[0043] Furthermore, such as Figure 2 As shown, transverse reinforcing posts 13 are connected to both sides of the disk body 11, forming a cavity 131 between the two transverse reinforcing posts 13 and the bottom of the disk body 11. This cavity 131 provides ample space for the encapsulation of the terminal post 3, reducing the space occupied by the terminal post 3 inside the battery. On the other hand, it also provides space for the busbar 33 connected to the terminal post 3, further reducing the occupancy rate inside the battery. Therefore, the transverse reinforcing posts 13 not only enhance the structure and stability of the disk body 11, but also provide ample space for the terminal post 3 and the busbar 33, making better use of the space inside the battery. Specifically, to prevent the disk body 11 from collapsing during use, at least two support posts 15 are provided along the bottom surface of the disk body 11 on the transverse reinforcing posts 13.

[0044] It should be noted that in this embodiment, all components on the isolation plate structure 1 are integrally formed structures.

[0045] Example 2

[0046] like Figure 3-5 As shown, this embodiment provides a cover plate assembly, which includes an end cap 2, an electrode post 3, and an isolation plate structure 1 as described in Embodiment 1. The end cap 2 is provided with a clearance hole 20, and the disc body 11 is provided with a mounting hole 16. The bottom end of the electrode post 3 is engaged in the mounting hole 16, and its top end extends through the clearance hole 20 to the top of the end cap 2. The outer diameter of the electrode post 3 is provided with an annular stop portion 30 integrally formed therewith. The upper end surface of the annular stop portion 30 is provided with an insulating sealing adhesive layer 31. The end cap 2 is insulated and sealed to the electrode post 3 through the insulating sealing adhesive layer 31.

[0047] With the above structure, the cover assembly has good sealing performance and applicability. The cover assembly is encapsulated on the battery housing 4, which can provide more usable space inside the battery, so that the battery can improve its capacity, stability and safety within a limited volume.

[0048] Specifically, such as Figure 4 and Figure 5As shown, the bottom edge of the pole post 3 has a chamfered structure, and an annular retaining part 30 and the bottom end of the pole post 3 are provided with an annular snap-fit ​​groove 32. The separator structure 1 is fixed by snapping into the annular snap-fit ​​groove 32 through the mounting hole 16. The end cover 2 is provided with a first through hole 21, and a protective cover 22 is installed on the first through hole 21. The protective cover 22 is provided with a pressure relief hole 220. The disc body 11 is provided with a second through hole 17, and an explosion-proof valve 171 is installed on the second through hole 17. The first through hole 21 and the second through hole 17 are coaxially arranged. Under this structure, when thermal runaway occurs inside the battery, the explosion-proof valve 171 can effectively open a pressure relief channel to the outside of the battery, ensuring the safety of battery use.

[0049] Furthermore, the end cap 2 and the disk body 11 are provided with coaxial upper liquid injection hole 23 and lower liquid injection hole 18, and a sealing pin 24 is installed at the entrance of the upper liquid injection hole 23. The inner wall of the upper liquid injection hole 23 and the outer wall of the sealing pin 24 are respectively conical, so that the sealing pin 24 can fit more closely with the inner wall of the upper liquid injection hole 23 to seal and prevent electrolyte leakage. When the sealing pin 24 is installed in the upper liquid injection hole 23, the top surface of the sealing pin 24 is flush with the end cap 2. On the other hand, the bottom of the outer circumference of the end cap 2 is provided with a step 25, which can provide efficient positioning and installation efficiency for the cover plate assembly and battery casing 4 packaging process. Among them, the diameter of the separator structure 1 is smaller than the diameter of the end cap 2, and the bottom end of the electrode post 3 is connected to the busbar 33.

[0050] Example 3

[0051] like Figure 6 As shown, this embodiment provides a battery, which includes a housing 4, a battery cell, and a cover assembly as described in Embodiment 2. The cover assembly is encapsulated at the opening of the housing 4 and forms a receiving cavity, in which the battery cell is disposed. The battery provided in this embodiment has a large internal space, which not only allows for the injection of sufficient electrolyte to improve the battery's capacity and stability, but also provides more space for subsequent internal battery structures.

[0052] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A spacer structure installed under an end cap, characterized by, The isolation sheet structure includes: A fixed frame, wherein a protrusion extends upward on the inner wall of the fixed frame; The disc body has its two ends connected to the inner wall of the protrusion, and a hollow part is formed between the two sides of the disc body and the protrusion. A transverse reinforcing column is connected to the two sides of the disc body, and an air-proof cavity is formed between the transverse reinforcing column and the bottom surface of the disc body. The fixing frame, protrusion, disc and transverse reinforcing column are integrally formed.

2. The spacer structure of claim 1, wherein A longitudinal reinforcing column connects the two sides of the disc and the protrusion.

3. The spacer structure of claim 2, wherein The transverse reinforcing column is provided with a support column along the bottom surface of the disk.

4. A cover plate assembly comprising an end cap, a pole, and the spacer structure of any one of claims 1-3, wherein, The end cap is provided with a clearance hole, and the disc body is provided with a mounting hole. The bottom end of the pole is engaged in the mounting hole, and its top end extends through the clearance hole to the top of the end cap. The outer diameter of the pole is provided with an annular retaining part integrally formed therewith. The upper end surface of the annular retaining part is provided with an insulating sealant layer. The end cap is fixedly connected to the pole through the insulating sealant layer.

5. A cover plate assembly according to claim 4, wherein The bottom edge of the pole post has a chamfered structure, and an annular snap-fit ​​groove is provided between the annular stop portion and the bottom end of the pole post. The isolation plate structure is snapped into the annular snap-fit ​​groove through the mounting hole.

6. A cover plate assembly according to claim 5, wherein The end cap is provided with a first through hole, a protective cover is installed on the first through hole, and a pressure relief hole is provided on the protective cover; the disc is provided with a second through hole, an explosion-proof valve is installed on the second through hole, and the first through hole and the second through hole are coaxially arranged.

7. A cover plate assembly according to claim 6, wherein The end cap and the disc are provided with an upper liquid injection hole and a lower liquid injection hole on the same axis, and a sealing nail is installed at the entrance of the upper liquid injection hole.

8. A cover plate assembly according to claim 7, wherein The inner wall of the upper injection hole and the outer wall of the sealing pin are respectively conical; the bottom of the outer circumference of the end cap is provided with a step, and the diameter of the isolation plate structure is smaller than the diameter of the end cap.

9. A cover plate assembly according to claim 8, wherein, The bottom end of the pole is connected to a busbar.

10. A battery comprising a casing, a cell, and a cover assembly as described in any one of claims 4-9, characterized in that, The cover plate assembly is encapsulated at the opening of the housing and forms a receiving cavity, in which the battery cell is disposed.

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