A cover plate structure and a battery using the same

Abstract

The utility model relates to a kind of cover plate structure and battery using the cover plate, light cover plate is round piece structure, central position is provided with through-hole, and annular groove is provided around through-hole, and light cover plate is formed annular thinning area by groove;Pole central position is provided with step through-hole, battery is injected by the step through-hole;The cover plate is applied to battery, and local thinning area is formed by light cover plate setting annular groove, realize battery explosion-proof valve function, without independent explosion-proof piece and without needing protection patch to protect it, simplify welding and sealed helium detection procedure, reduce cost;Liquid injection port on light cover plate is placed in pole central position, battery does not need to find liquid injection port position when injecting, simplify liquid injection procedure;Explosion and liquid injection function are placed in cover plate central position, battery does not need to consider liquid injection port and explosion-proof piece position avoidance when PACK string parallel welding;The utility model has the advantages of simple structure, simplify helium detection and liquid injection procedure, reduce cost, convenient to use.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a cover plate structure and a battery using the cover plate. Background Technology

[0002] Lithium-ion or sodium-ion batteries have advantages such as light weight, large energy storage, high power, no pollution, long life, low self-discharge coefficient, and wide temperature adaptability, thus gradually gaining popularity and replacing other traditional batteries in the fields of energy storage and power batteries. For cylindrical batteries, the explosion-proof valve of the traditional cover structure is generally made by welding an independent explosion-proof sheet to the smooth cover. In order to prevent the explosion-proof sheet from being damaged during transportation and use, explosion-proof sheet patches are required to protect the explosion-proof sheet. At the same time, helium testing and other inspection processes are required to check the welding seal of the explosion-proof sheet. To achieve the explosion-proof function of the battery, the cost of battery materials, production and testing is greatly increased. The traditional liquid filling port is generally located on the cover. When filling, the position of the liquid filling port needs to be accurately located, which increases the cost of the liquid filling process. At the same time, for the independent explosion-proof valve and liquid filling port on the traditional cover, the position of the liquid filling port and explosion-proof valve must be considered during battery use, which is inconvenient. Therefore, it is necessary to provide a cover structure and a battery using the cover that is simple and reasonable, simplifies the helium testing and liquid filling process, reduces costs and is easy to use. Summary of the Invention

[0003] (a) Technical issues In view of the above-mentioned existing technology, this application mainly addresses the following technical problems: 1. Traditional explosion-proof valves with cover plates use independent explosion-proof plates and require patch protection, which leads to the need for inspection processes such as helium testing to check the weld sealing, increasing the cost of battery materials, production and testing. 2. Traditionally, the injection port is located on the cover plate, which requires accurate location of the injection port during injection, increasing the cost of the injection process; 3. Traditional covers have independent explosion-proof valves and liquid filling ports. During battery use, the location of the liquid filling port and explosion-proof valve needs to be considered to avoid them, which is inconvenient.

[0004] (II) Technical Solution The purpose of this invention is to overcome the shortcomings of the prior art and provide a cover plate structure that is simple and reasonable in structure, simplifies the helium detection and liquid injection process, reduces costs, and is easy to use, as well as a battery using the cover plate.

[0005] The purpose of this utility model is achieved as follows: a cover plate structure includes a cover plate body, the cover plate body including a light cover plate, a first polar connecting piece and a lower plastic part, the first polar connecting piece being fixedly connected below the light cover plate, the lower plastic part being fixed between the light cover plate and the first polar connecting piece, the light cover plate having a through hole at its center, and an annular groove being provided around the through hole; an electrode post is installed on the upper part of the light cover plate, and a stepped through hole is provided at the center of the electrode post.

[0006] Furthermore, the cover plate is a circular sheet structure, the annular groove is located on the bottom surface of the plastic part corresponding to the cover plate, and the cover plate forms an annular thinning area through the annular groove.

[0007] Specifically, the annular thinning zone is used to effectively discharge high-temperature and high-pressure gases, avoiding the risk of explosion after battery thermal runaway. It realizes the function of an explosion-proof valve, and there is no need to design an explosion-proof sheet separately on the cover plate. In addition, it can solve the drawback of existing technologies that require protection of the explosion-proof sheet. The structure is simple and reasonable, and the actual use effect is better. It can also simplify related processes, such as explosion-proof sheet welding and sealing helium detection.

[0008] Furthermore, the electrode post is a columnar structure with an axial cross-section of I-shape, and the stepped through hole extends in the direction of the through hole for injecting electrolyte into the battery.

[0009] Specifically, the stepped through hole corresponds to the central through hole of the cover plate, realizing the function of the liquid injection port for battery liquid injection. This makes the liquid injection port located at the center of the electrode post. Compared with the traditional liquid injection port set on the cover plate, there is no need to accurately locate the liquid injection port, resulting in higher liquid injection efficiency and reduced liquid injection cost. There is also no need to consider the need for position avoidance, thus enabling better optimization of the cover plate structure.

[0010] Furthermore, the electrode post is assembled in the through hole at the center of the light cover plate, and an insulating seal is provided between the electrode post and the light cover plate to achieve insulation and sealing.

[0011] Specifically, insulating seals are used to isolate and separately insulate the terminals and the cover plate, preventing series connection between the terminals and the cover plate, which are the two polarities of the battery, and thus avoiding damage.

[0012] Furthermore, a sealing pin is fitted inside the stepped through hole at the center of the pole post, and the sealing pin achieves external sealing of the pole post through laser welding.

[0013] Specifically, the sealing pin is located inside the stepped through hole and is tightly connected to the pole post by laser welding, so that the cover plate structure forms an integral sealed structure. This effectively prevents external dust, moisture and other substances from entering the cover plate, causing the cover plate to fail or even be damaged. While improving the overall sealing performance of the cover plate, it also provides better protection for the internal components and greatly extends their service life.

[0014] Furthermore, the electrode post is the first polarity of the battery, and the light cover plate is the second polarity of the battery.

[0015] Furthermore, the first polar connecting piece and the cover plate are insulated from each other by a lower plastic component.

[0016] A battery, comprising at least a cover plate, said cover plate having the cover plate structure described above.

[0017] (III) Beneficial Effects 1. Compared with the traditional cover plate structure, this cover plate achieves the battery's explosion-proof valve function by setting an annular groove on the smooth cover plate and forming a local thinning area on the smooth cover plate. There is no independent explosion-proof sheet, nor is there a need for explosion-proof sheet protection patch to protect the explosion-proof sheet. At the same time, it simplifies the explosion-proof sheet welding and sealing helium test processes, reducing the product cost. 2. Compared with the traditional cover plate structure, the liquid injection port on the cover plate is placed at the center of the terminal post, so the liquid injection port does not need to be accurately located when the battery is injected, simplifying the liquid injection process; 3. Both the explosion-proof function and the liquid filling function are located in the center of the cover plate. When the battery is connected in series and parallel in the PACK, there is no need to consider the position of the liquid filling port and the explosion-proof plate, making it more convenient to use. Attached Figure Description

[0018] Figure 1 This is an axial view of the cover plate of this utility model.

[0019] Figure 2 This is an exploded view of the cover plate of this utility model from an external perspective.

[0020] Figure 3 This is an exploded view of the inside of the cover plate of this utility model.

[0021] Figure 4 This is a top view of the cover plate of this utility model.

[0022] Figure 5 This is a cross-sectional view of the cover plate of this utility model along the center line.

[0023] Figure 6 This is a schematic diagram of the cover plate and battery of this utility model.

[0024] In the figure: 1. Cover plate body; 2. First polarity connecting piece; 3. Lower plastic part; 4. Plain cover plate; 4-1. Through hole; 4-2. Annular groove; 4-3. Thinning area; 5. Insulating seal; 6. Terminal post; 6-1. Stepped through hole; 7. Sealing nail; 8. Cylindrical battery W, outer N, inner Z, center line. Detailed Implementation

[0025] The present invention will be further described below with reference to the embodiments and / or accompanying drawings. Example 1

[0026] like Figure 1-5 As shown, a cover plate structure includes a cover plate body 1, which includes a light cover plate 4, a first polar connecting piece 2, and a lower plastic part 3. The first polar connecting piece 2 is fixedly connected to the bottom of the light cover plate 4, and the lower plastic part 3 is fixed between the light cover plate 4 and the first polar connecting piece 2. The light cover plate 4 has a through hole 4-1 at its center, and an annular groove 4-2 is provided around the through hole 4-1. An electrode post 6 is installed on the upper part of the light cover plate 4, and a stepped through hole 6-1 is provided at the center of the electrode post 6.

[0027] The cover plate 4 is a circular sheet structure. The annular groove 4-2 is located on the bottom surface of the plastic part 3 corresponding to the cover plate 4, and the cover plate 4 forms an annular thinning area 4-3 through the annular groove 4-2.

[0028] In this invention, an annular groove is arranged around the through hole, and the cover plate forms an annular thinning area through the annular groove. When the battery experiences thermal runaway, high-temperature and high-pressure gas can break through the thinning area and escape from the battery, thus preventing the battery from exploding.

[0029] The electrode post 6 is an I-shaped columnar structure with an axial cross section, and the stepped through hole 6-1 extends towards the through hole 4-1 for injecting electrolyte into the battery.

[0030] In this invention, a stepped through hole is provided at the center of the electrode post, and the stepped through hole corresponds to the through hole at the center of the cover plate. This allows the liquid injection port of the cover plate to be designed at the center of the electrode post. The battery can be injected with liquid through the stepped through hole, which is simple and convenient. There is no need to accurately locate the liquid injection port, greatly simplifying the liquid injection process.

[0031] The pole post 6 is assembled in the through hole 4-1 at the center of the cover plate 4, and the insulation and sealing between the pole post 6 and the cover plate 4 are achieved by the insulating seal 5.

[0032] The sealing nail 7 is assembled in the stepped through hole 6-1 at the center of the pole post, and the sealing nail 7 seals the pole post 6 externally by laser welding.

[0033] The electrode post 6 is the first polarity of the battery, and the light cover plate 4 is the second polarity of the battery.

[0034] The lower plastic part 3 achieves insulation between the first polar connecting piece 2 and the light cover plate 4.

[0035] This utility model relates to a cover plate structure and a battery using the cover plate. Compared to traditional cover plate structures, this utility model achieves the battery's explosion-proof valve function by creating an annular groove on a smooth cover plate, forming a locally thinned area. It eliminates the need for a separate explosion-proof sheet and a protective patch, simplifying the welding and sealing helium detection processes, thus reducing product costs. Furthermore, compared to traditional cover plate structures, this utility model places the electrolyte inlet on the smooth cover plate at the center of the terminal post, eliminating the need to precisely locate the inlet during electrolyte filling, simplifying the filling process. With both the explosion-proof and electrolyte filling functions centrally located on the cover plate, the battery does not require consideration of the inlet and explosion-proof sheet's position during PACK series and parallel welding, making it more convenient to use. This utility model offers advantages such as simple and reasonable structure, simplified helium detection and electrolyte filling processes, reduced costs, and ease of use. Example 2

[0036] like Figure 6 As shown, a battery includes at least a cover plate, the cover plate having the cover plate structure described above.

[0037] In this utility model, as one feasible specific implementation, the battery can be a cylindrical battery 8, and the cover plate with the above-mentioned cover plate structure is assembled on the cylindrical battery 8.

[0038] This utility model relates to a cover plate structure and a battery using the cover plate. Compared to traditional cover plate structures, this utility model achieves the battery's explosion-proof valve function by creating an annular groove on a smooth cover plate, forming a locally thinned area. It eliminates the need for a separate explosion-proof sheet and a protective patch, simplifying the welding and sealing helium detection processes, thus reducing product costs. Furthermore, compared to traditional cover plate structures, this utility model places the electrolyte inlet on the smooth cover plate at the center of the terminal post, eliminating the need to precisely locate the inlet during electrolyte filling, simplifying the filling process. With both the explosion-proof and electrolyte filling functions centrally located on the cover plate, the battery does not require consideration of the inlet and explosion-proof sheet's position during PACK series and parallel welding, making it more convenient to use. This utility model offers advantages such as simple and reasonable structure, simplified helium detection and electrolyte filling processes, reduced costs, and ease of use.

Claims

1. A cover plate structure comprising a cover plate body, the cover plate body including a smooth cover plate, a first polar connecting piece, and a lower plastic component, characterized in that: The first polar connecting piece is fixedly connected to the bottom of the light cover plate, and the lower plastic part is fixed between the light cover plate and the first polar connecting piece. The light cover plate has a through hole at its center and an annular groove around the through hole. An electrode post is installed on the upper part of the light cover plate, and a stepped through hole is provided at the center of the electrode post.

2. The cover plate structure as described in claim 1, characterized in that: The cover plate is a circular sheet structure, and the annular groove is located on the bottom surface of the plastic part corresponding to the cover plate. The cover plate forms an annular thinning area through the annular groove.

3. The cover plate structure as described in claim 2, characterized in that: The electrode post is an I-shaped columnar structure with an axial cross-section, and the stepped through hole extends in the direction of the through hole for filling the battery with electrolyte.

4. A cover plate structure as described in claim 3, characterized in that: The electrode post is assembled in the through hole at the center of the cover plate, and an insulating seal is provided between the electrode post and the cover plate to achieve insulation and sealing.

5. A cover plate structure as described in claim 4, characterized in that: A sealing pin is fitted inside the stepped through hole at the center of the pole post, and the sealing pin achieves external sealing of the pole post through laser welding.

6. A cover plate structure as described in claim 5, characterized in that: The terminal post is the first polarity of the battery, and the light cover plate is the second polarity of the battery.

7. A cover plate structure as described in claim 6, characterized in that: The first polar connecting piece is insulated from the cover plate by a lower plastic component.

8. A battery, characterized in that: It includes at least a cover plate, said cover plate having the cover plate structure as described in any one of claims 1-7.

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