An integrated top cover and a cylindrical battery

Abstract

The utility model relates to the technical field of lithium ion battery, specifically relates to a kind of integrated top cover and a cylindrical battery, integrated top cover includes cover plate, electrode terminal, sealing ring and positive current collector, cover plate is provided with anti-explosion scribe, center through-hole and liquid injection hole, the lower end surface of cover plate is provided with lower plastic layer, the pole of electrode terminal passes through center through-hole and is riveted with end cap at the place above cover plate, sealing ring is sleeved on pole, and the gap between electrode terminal and cover plate is sealed, the top cover of the utility model integrates electrode terminal, anti-explosion scribe and liquid injection hole, when the battery of the integrated top cover is composed PACK bag, the exposed height of electrode terminal corresponding space can be used as the part of PACK bag pressure relief exhaust space and electrical structure of use space, to reduce the overall height of pressure relief channel, reach the purpose of reducing PACK bag total height, and corresponding increase member cabin use space.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, specifically to an integrated top cover and a cylindrical battery. Background Technology

[0002] Currently, the electrode terminals of large cylindrical lithium-ion batteries of the 46 series on the market are usually located at the bottom of the casing, while the explosion-proof valve is located on the end cap. Its thermoelectric separation structure requires the design of the PACK to meet the bottom impact protection requirements while also taking into account the opening of the pressure relief channel. This results in an increase in the height of the PACK, which in turn reduces the height usable space of the crew compartment. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an integrated top cover that integrates electrode terminals, explosion-proof valves and liquid injection holes. This not only allows for the accommodation of some pressure relief and exhaust space and electrical structure space through the exposed height of the electrode terminals, thereby reducing the overall height of the pressure relief channel and achieving the purpose of reducing the total height of the PACK, but also increases the usable space of the crew compartment.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: an integrated top cover, including a cover plate, electrode terminals, a sealing ring, and a positive electrode current collector. The cover plate is provided with explosion-proof markings, a central through hole, and a liquid injection hole. A lower plastic layer is provided on the lower end surface of the cover plate. The electrode terminals include an electrode post, an end cap, and an electrode base. The electrode base is located below the cover plate. The electrode post passes through the central through hole and is connected to the electrode base. The sealing ring is fitted on the electrode post and seals the gap between the cover plate and the electrode terminal. The end cap is located above the cover plate and is connected to the electrode post. An upper plastic layer is provided on the upper end surface of the cover plate in the area corresponding to the end cap. The positive electrode current collector is connected to the electrode base.

[0005] As an optional technical solution, the pole base and pole post are an integrated structure, with the pole post riveted to the end cap.

[0006] As an optional technical solution, the electrode terminals are made of aluminum.

[0007] As an optional technical solution, the upper surface of the cover plate is provided with a groove, which extends circumferentially around the central through hole to form a C-shaped explosion-proof etched line.

[0008] As an optional technical solution, the groove depth is 0.67-0.83 times the thickness of the cover plate.

[0009] As an optional technical solution, the diameter of the explosion-proof etched line is 0.45-0.65 times the diameter of the cover plate.

[0010] As an optional technical solution, the injection hole is located between the two ends of the explosion-proof marking.

[0011] As an optional technical solution, the distance between the two ends of the explosion-proof etched line and the injection hole is 3-6 times the diameter of the injection hole.

[0012] As an optional technical solution, the height of the electrode terminals exposed above the cover plate is 5-15 times the thickness of the cover plate.

[0013] Based on the same concept, this utility model also provides a cylindrical battery, including the aforementioned integrated top cover.

[0014] Compared with the prior art, the advantages of this utility model are as follows: Compared with the existing 46 series battery design where the electrode terminals and explosion-proof valve are distributed on opposite sides and the liquid injection hole is usually distributed on the same side as the electrode terminals or explosion-proof valve, this utility model integrates the electrode terminals, explosion-proof markings and liquid injection hole on the integrated end cover. The space corresponding to the exposed height of the electrode terminals can be used as part of the pressure relief and venting space of the PACK and the space for the use of electrical structure, so as to reduce the overall height of the pressure relief channel, thereby reducing the total height of the PACK and increasing the usable space of the crew compartment. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a cross-sectional schematic diagram of the integrated top cover; Figure 2 A schematic diagram of the upper surface of the integrated top cover; Figure 3 A 3D schematic diagram of the integrated top cover; Figure 4 Exploded view of a cylindrical battery with an integrated top cover; In the diagram: 1. Cover plate, 2. Sealing ring, 3. Positive current collector, 4. Explosion-proof markings, 5. Center through hole, 6. Liquid injection hole, 7. Lower plastic layer, 8. Terminal post, 9. End cap, 10. Upper plastic layer, 11. Sealing nail, 12. Battery cell, 13. Negative current collector, 14. Housing, 15. Integrated top cover. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1 like Figures 1-3 As shown, an integrated top cover includes a cover plate 1, electrode terminals, a sealing ring 2, and a positive current collector 3. The cover plate 1 is a circular plate with a central through hole 5 located at the center of the cover plate 1 and penetrating the upper and lower end faces of the cover plate 1. The cover plate 1 also has a groove extending in a C-shape around the central through hole 5. The C-shaped groove is a C-shaped explosion-proof line 4, which serves as a weak point on the cover plate 1. When the internal pressure of the battery reaches a threshold, the groove opens and releases pressure to ensure the safe use of the battery cell 12. The cover plate 1 also has an electrolyte injection hole 6, which is a channel for injecting electrolyte. When the integrated top cover 15 is used on a battery, a sealing pin 11 is installed at the electrolyte injection hole 6 to ensure the sealing of the internal environment of the battery.

[0019] The cover plate 1 is made of nickel-plated SPCC or SUS steel to prevent corrosion from the internal electrolyte and external environment. The diameter of the explosion-proof etched line 4 is preferably 0.45-0.65 times the diameter of the cover plate 1, and the depth of the groove forming the explosion-proof etched line 4 is preferably 0.67-0.83 times the thickness of the cover plate 1. The two ends of the explosion-proof etched line 4 are not connected. The injection hole 6 is located between the two ends of the explosion-proof etched line 4. The injection hole 6 is a round hole, and the distance between the two ends of the explosion-proof etched line 4 and the injection hole 6 is 3-6 times the diameter of the injection hole 6 to prevent the explosion-proof etched line 4 from interfering with electrolyte corrosion during battery filling and causing failure.

[0020] The electrode terminal includes a pole 8, an end cap 9, and a base. The base is located at the lower center of the cover plate 1. The base is larger than the central through hole 5 but cannot pass through it. The pole 8 passes through the central through hole 5 and is connected to the base. One end of the pole 8 extends below the cover plate 1 and connects to the base. A sealing ring 2 is fitted onto the pole 8, abutting against the cover plate 1 and the electrode terminal to seal the gap between the cover plate 1 and the electrode terminal. The other end of the pole 8 extends above the cover plate 1. The end cap 9 is located at the upper center of the cover plate 1 and connects to the pole 8. The distance between the upper surface of the end cap 9 and the upper surface of the cover plate 1 is the height of the electrode terminal exposed above the cover plate 1. This distance is preferably 5-15 times the diameter of the cover plate 1.

[0021] The electrode base, electrode post 8, and end cap 9 are all made of aluminum. The electrode base and electrode post 8 are preferably an integral structure. The electrode post 8 and end cap 9 are connected by riveting. The positive electrode current collector 3 is connected to the electrode base.

[0022] The lower end face of the cover plate 1 is provided with a lower plastic layer 7, and the lower plastic layer 7 has a clearance hole reserved at the corresponding central through hole 5 and injection hole 6; the upper end face of the cover plate 1 is provided with an upper plastic layer 10 at the corresponding end cap 9 area, and the upper plastic layer 10 also has a clearance hole reserved at the corresponding central through hole 5.

[0023] In a further embodiment, a limiting groove is provided on the cover plate 1, which is concentric with the central through hole 5. The upper end of the central through hole 5 is located in the limiting groove. A first limiting protrusion is provided on the lower end face of the upper plastic layer 10. The first limiting protrusion is embedded in the limiting groove and cooperates with the limiting groove. A second limiting protrusion is also provided on the lower end face of the first limiting protrusion. The second limiting protrusion extends into the gap between the pole post 8 and the central through hole 5. The outer ring of the upper plastic layer 10 extends to the outside of the end cap 9 and covers the outer ring of the end cap 9 upward. This design can effectively improve the stability of the connection and cooperation between adjacent components.

[0024] The sealing ring 2 is sleeved on the electrode post 8 and located between the lower end face of the cover plate 1 and the upper end face of the electrode base. The upper end face of the sealing ring 2 is provided with a third limiting protrusion, which extends upward into the gap between the electrode post 8 and the central through hole 5 to ensure that the gap between the electrode terminal and the cover plate 1 is sealed. The outer end face of the sealing ring 2 can also abut against the inner end face of the upper plastic layer 10 corresponding to the central through hole 5.

[0025] The integrated top cover 15 of this embodiment, which combines the electrode terminals, explosion-proof markings 4, and liquid injection hole 6 into one design, can be applied to cylindrical lithium batteries. This not only allows for the inclusion of some pressure relief and venting space and the usable space of the electrical structure through the exposed electrode terminals, thereby reducing the overall height of the pressure relief channel, but also further reduces the total height of the subsequent PACK pack, increasing the usable space of the crew compartment.

[0026] Example 2 like Figure 4 As shown, a cylindrical battery includes the integrated top cover 15 described in Embodiment 1, and also includes a sealing pin 11, a battery cell 12, a negative current collector 13, a housing 14, and other structures. The negative electrode of the battery cell 12 is connected to the negative current collector 13. The battery cell 12 and the negative current collector 13 are installed inside the housing 14, and the negative current collector 13 is connected to the bottom of the housing 14. The positive current collector 3 in the integrated top cover 15 is bent and connected to the positive electrode of the battery cell 12. The integrated top cover 15 is installed at the opening of the housing 14 and seals the battery cell 12 inside the housing 14. After the battery is filled with electrolyte, the filling port is sealed with the sealing pin 11.

[0027] When the cylindrical battery in this embodiment is assembled into a PACK, there is a certain height difference between the electrode terminals and the cover plate 1. The space corresponding to this height difference can accommodate part of the electrical structure of the PACK, and this space can also serve as part of the pressure relief space channel. This effectively ensures that the height space occupied by the pressure relief channel inside the PACK is reduced, thereby improving the utilization rate of the internal space of the PACK and reducing the overall height of the PACK.

[0028] In this specification, the terms "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An integrated top cover, characterized in that: The device includes a cover plate (1), electrode terminals, a sealing ring (2), and a positive current collector (3). The cover plate (1) is provided with explosion-proof markings (4), a central through hole (5), and a liquid injection hole (6). The lower end face of the cover plate (1) is provided with a lower plastic layer (7). The electrode terminals include a pole post (8), an end cap (9), and a base. The base is located below the cover plate (1). The pole post (8) passes through the central through hole (5) and is connected to the base. The sealing ring (2) is fitted on the pole post (8) and seals the gap between the cover plate (1) and the electrode terminals. The end cap (9) is located above the cover plate (1) and is connected to the pole post (8). The upper end face of the cover plate (1) is provided with an upper plastic layer (10) in the area corresponding to the end cap (9). The positive current collector (3) is connected to the base.

2. An integrated top cover according to claim 1, characterized in that: The pole base and pole post (8) are an integral structure, and the pole post (8) is riveted to the end cap (9).

3. An integrated top cover according to claim 2, characterized in that: The electrode terminals are made of aluminum.

4. An integrated top cover according to claim 2, characterized in that: The upper surface of the cover plate (1) is provided with a groove, which extends circumferentially around the central through hole (5) to form a C-shaped explosion-proof etched line (4).

5. An integrated top cover according to claim 4, characterized in that: The groove depth is 0.67-0.83 times the thickness of the cover plate (1).

6. An integrated top cover according to claim 4, characterized in that: The diameter of the explosion-proof etched line (4) is 0.45-0.65 times the diameter of the cover plate (1).

7. An integrated top cover according to claim 6, characterized in that: The injection hole (6) is located between the two ends of the explosion-proof marking (4).

8. An integrated top cover according to claim 7, characterized in that: The distance between the two ends of the explosion-proof etched line (4) and the injection hole (6) is 3-6 times the diameter of the injection hole (6).

9. An integrated top cover according to claim 4, characterized in that: The height of the electrode terminals exposed above the cover plate (1) is 5-15 times the thickness of the cover plate (1).

10. A cylindrical battery, characterized in that: Includes the integrated top cover (15) as described in any one of claims 1-9.

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