A novel cylindrical battery structure with aluminum shell

Abstract

The utility model belongs to new energy battery field especially, it is a kind of new type aluminum shell cylindrical battery structure, it includes cylindrical battery aluminum cylinder shell, the battery roll core and negative pole end of cylindrical battery aluminum cylinder shell internal sleeve, this new type aluminum shell cylindrical battery structure further includes: negative pole end includes negative pole current collector, connecting disc and cover plate, negative pole current collector, connecting disc and cover plate are sequentially arranged from below to top, in the utility model, by connecting inner tube, center liquid injection can be used, and the penetration effect is good, and the quantity of structural member is less, and the cost is low, and the welding procedure of technological process is less, the positive pole current collector is welded and combined as a welding procedure with positive pole penetration welding, without setting positive pole current collector, significantly improve process efficiency and yield, negative pole current collector and cover plate are designed separately, save cost, double explosion-proof valve design, when battery heat runaway can effectively remove battery internal air pressure, battery does not occur fire explosion.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a novel aluminum-cased cylindrical battery structure. Background Technology

[0002] Aluminum-cased cylindrical batteries are one of the mainstream batteries nowadays and are widely used in new energy fields. In the existing technology, Chinese patent document with application number: 201810220300.9 discloses an aluminum-cased cylindrical battery.

[0003] However, due to structural defects, the above technical solution still has the following problems: 1. Currently, there are many welding processes for large cylindrical batteries, including welding of negative electrode current collector, welding of positive electrode current collector, through welding, welding of sealing nails, and welding of the cover plate circumference. The many welding processes result in low process yield, low efficiency, and high cost. Moreover, most of them are eccentric liquid injection. At present, most of the tab processing methods on the market are flattening methods. The flattened end face is tight, so liquid injection and wetting are difficult to be carried out, which increases the battery process time and has low efficiency. 2. Currently, most structures are double-walled shells, which have a large number of structural components and high costs; 3. Currently, most single-channel aluminum casings are designed with a single explosion-proof diaphragm, which makes it difficult to quickly and effectively release the pressure of thermal runaway inside the battery, causing the battery to catch fire and explode; 4. Currently, single-channel battery covers are generally designed as an integrated current collector and cover, which is costly.

[0004] In summary, the existing design of large cylindrical battery cover plates has problems such as a large number of structural components, many processes, low yield, difficulty in liquid injection, high cost, and failure to pass thermal runaway tests. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as a large number of structural components, numerous processes, low yield, difficulty in electrolyte injection, high cost, and failure to pass thermal runaway tests, by proposing a novel aluminum-cased cylindrical battery structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A novel aluminum-cased cylindrical battery structure includes a cylindrical battery aluminum casing, a battery core housed inside the cylindrical battery aluminum casing, and a negative terminal. The novel aluminum-cased cylindrical battery structure also includes: The negative electrode includes a negative electrode current collector, a connecting plate, and a cover plate, which are arranged sequentially from bottom to top. The edge of the cover plate is welded to the negative electrode edge of the cylindrical battery aluminum shell by a sealing nail. The boss assembly includes a sealing ring, a connecting inner cylinder, an insulating disc, and a negative electrode retaining ring. The inner side of the bottom of the connecting inner cylinder is engaged with the protruding hole at the axis of the negative electrode current collector. The sealing ring is sleeved between the connecting inner cylinder and the negative electrode current collector. The top of the connecting inner cylinder passes through the hole at the axis of the connecting disc and the cover plate. The insulating disc is sleeved on the surface of the connecting inner cylinder. The negative electrode retaining ring is engaged with the connecting inner cylinder. The explosion-proof valve is located between the connecting plate and the cover plate. It allows for center-filling liquid injection through the connecting inner cylinder, resulting in good penetration. It has fewer structural components, lower cost, and fewer welding steps in the process flow. The welding of the positive current collector and the positive current penetration welding are combined into one welding process, eliminating the need for a separate positive current collector, which significantly improves process efficiency and yield. The negative current collector and the cover plate are designed separately to save costs. The dual explosion-proof valve design can effectively release the internal gas pressure of the battery in the event of thermal runaway, preventing the battery from catching fire and exploding.

[0007] As a preferred embodiment of this utility model, the explosion-proof valve includes an explosion-proof seat and an explosion-proof disc. The bottom of the explosion-proof seat is engaged with the hole of the connecting plate, the top of the explosion-proof seat is welded to the bottom of the explosion-proof disc, and the top of the explosion-proof disc extends into the hole at the top of the cover plate.

[0008] Furthermore, a pressure relief structure can be formed between the explosion-proof base and the explosion-proof sheet, allowing the explosion-proof sheet to create a gap with the explosion-proof base under pressure.

[0009] As a preferred embodiment of this utility model, a pressure relief membrane is bonded to the inner side of the explosion-proof base, and two pressure relief membranes are provided.

[0010] Furthermore, the two pressure relief membranes are stacked together, which can be sealed under normal conditions, and when the pressure is too high, the pressure relief membranes are pushed open to relieve the pressure.

[0011] As a preferred embodiment of this utility model, the top of the connecting plate is provided with an explosion-proof hole, and the pressure relief membrane corresponds to the explosion-proof hole.

[0012] Furthermore, the explosion-proof vents allow pressure to approach the pressure relief membrane.

[0013] As a preferred embodiment of this utility model, the bottom of the cylindrical battery aluminum casing is pressed with explosion-proof grooves, and there are three explosion-proof grooves. The inside of the explosion-proof grooves is welded to the bottom of the battery core through welding.

[0014] Furthermore, the bottom of the cylindrical battery aluminum casing is provided with three explosion-proof grooves, which can also be used for penetration welding.

[0015] In a preferred embodiment of this utility model, the top of the negative electrode current collector and the bottom of the connecting plate are connected by a connecting inner cylinder. The through hole of the connecting inner cylinder communicates with the hole of the negative electrode current collector and extends directly to the center of the battery core.

[0016] Furthermore, the inner connecting cylinder has an I-shaped structure, which facilitates the connection of the connecting plate and the cover plate, as well as the connection of the negative electrode collector, connecting plate and cover plate. In addition, the inner connecting cylinder facilitates liquid injection.

[0017] As a preferred embodiment of this utility model, a flow-guiding arc-shaped plate is welded to the bottom of the connecting plate, and two flow-guiding arc-shaped plates are provided, with two T-shaped plates welded to the inner side of the flow-guiding arc-shaped plates.

[0018] Furthermore, a notched circle is formed between the two flow-guiding arc-shaped plates, and the T-shaped plate on the inner side of the flow-guiding arc-shaped plates facilitates the separation of cavities. Beneficial effects

[0019] By connecting the inner cylinder, center injection can be used, resulting in good penetration effect, fewer structural components, lower cost, and fewer welding steps in the process flow. The welding of the positive current collector and the positive current penetration welding are combined into one welding process, eliminating the need for a separate positive current collector, which significantly improves process efficiency and yield. The negative current collector and cover plate are designed separately to save costs. The dual explosion-proof valve design can effectively remove internal gas pressure in the event of thermal runaway, preventing the battery from catching fire or exploding. Attached Figure Description

[0020] Figure 1 This is an overall perspective view of a novel aluminum-cased cylindrical battery structure proposed in this utility model; Figure 2 A perspective view of the connecting disk of a novel aluminum-cased cylindrical battery structure proposed in this utility model; Figure 3 This is a three-dimensional view of the negative end of a novel aluminum-cased cylindrical battery structure proposed in this utility model; Figure 4 This is a perspective view of the battery core of a novel aluminum-cased cylindrical battery structure proposed in this utility model.

[0021] In the diagram: 1. Cylindrical battery aluminum casing; 2. Battery core; 3. Negative electrode current collector; 4. Connecting disc; 5. Cover plate; 6. Sealing ring; 7. Connecting inner cylinder; 8. Insulating disc; 9. Negative electrode retaining ring; 10. Explosion-proof base; 11. Explosion-proof sheet; 12. Pressure relief membrane; 13. Explosion-proof groove; 14. Guide arc plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example

[0023] Reference Figure 1-4A novel aluminum-cased cylindrical battery structure includes a cylindrical aluminum casing 1, a battery core 2 housed inside the cylindrical aluminum casing 1, and a negative terminal. The novel aluminum-cased cylindrical battery structure also includes: The negative electrode includes a negative electrode current collector 3, a connecting plate 4, and a cover plate 5. The negative electrode current collector 3, the connecting plate 4, and the cover plate 5 are arranged sequentially from bottom to top. The edge of the cover plate 5 is welded to the negative electrode edge of the cylindrical battery aluminum shell 1 by a sealing nail. The boss assembly includes a sealing ring 6, a connecting inner cylinder 7, an insulating disc 8, and a negative electrode retaining ring 9. The inner side of the bottom of the connecting inner cylinder 7 is engaged with the protrusion at the axis of the negative electrode current collector 3. The sealing ring 6 is sleeved between the connecting inner cylinder 7 and the negative electrode current collector 3. The top of the connecting inner cylinder 7 passes through the hole at the axis of the connecting disc 4 and the cover plate 5. The insulating disc 8 is sleeved on the surface of the connecting inner cylinder 7. The negative electrode retaining ring 9 is engaged with the connecting inner cylinder 7. The explosion-proof valve is located between the connecting plate 4 and the cover plate 5. It can be used for center liquid injection through the inner cylinder 7, which has a good penetration effect, fewer structural parts, low cost, and fewer welding steps in the process flow. The welding of the positive electrode current collector and the positive electrode penetration welding are combined into one welding process. There is no separate positive electrode current collector, which significantly improves process efficiency and yield. The negative electrode current collector 3 and the cover plate 5 are designed separately to save costs. The dual explosion-proof valve design can effectively remove the internal gas pressure of the battery when thermal runaway occurs, preventing the battery from catching fire and exploding.

[0024] In order to achieve the pressure relief effect, such as Figure 3 As shown, the explosion-proof valve includes an explosion-proof seat 10 and an explosion-proof disc 11. The bottom of the explosion-proof seat 10 is engaged with the hole in the connecting plate 4, and the top of the explosion-proof seat 10 is welded to the bottom of the explosion-proof disc 11. The top of the explosion-proof disc 11 extends into the hole in the top of the cover plate 5. A pressure relief structure can be formed between the explosion-proof seat 10 and the explosion-proof disc 11. The explosion-proof disc 11 can create a gap with the explosion-proof seat 10 under pressure.

[0025] In order to achieve the effect of pressure relief, such as Figure 3 As shown, a pressure relief membrane 12 is bonded to the inner side of the explosion-proof base 10. There are two pressure relief membranes 12, which are stacked together and can be sealed under normal conditions. When the pressure is too high, the pressure relief membrane 12 is pushed open to relieve the pressure.

[0026] In order for pressure to be transmitted to the pressure relief membrane 12, such as Figure 3 As shown, the top of the connecting plate 4 is provided with an explosion-proof hole, and the pressure relief membrane 12 corresponds to the explosion-proof hole. The explosion-proof hole allows pressure to approach the pressure relief membrane 12.

[0027] In order to achieve the effect of explosion protection, such as Figure 4As shown, the bottom of the cylindrical battery aluminum casing 1 is pressed with explosion-proof grooves 13. There are three explosion-proof grooves 13. The inside of the explosion-proof grooves 13 is welded to the bottom of the battery core 2 through welding. The bottom of the cylindrical battery aluminum casing 1 is provided with three explosion-proof grooves 13. The explosion-proof grooves 13 can also be used for through welding.

[0028] In order to assemble the negative extreme, such as Figure 3 As shown, the top of the negative electrode current collector 3 and the bottom of the connecting plate 4 are connected by a connecting inner cylinder 7. The through hole of the connecting inner cylinder 7 is connected to the hole of the negative electrode current collector 3 and is directly connected to the center of the battery core 2. The connecting inner cylinder 7 has an I-shaped structure, which facilitates the connection of the connecting plate 4 and the cover plate 5, and also facilitates the connection of the negative electrode current collector 3, the connecting plate 4 and the cover plate 5. In addition, the connecting inner cylinder 7 is convenient for liquid injection.

[0029] To facilitate the management of stress, such as Figure 4 As shown, a flow-guiding arc-shaped plate 14 is welded to the bottom of the connecting plate 4. There are two flow-guiding arc-shaped plates 14. Two T-shaped plates are welded to the inner side of the flow-guiding arc-shaped plate 14. The two flow-guiding arc-shaped plates 14 form a circle with a gap. The T-shaped plates on the inner side of the flow-guiding arc-shaped plate 14 facilitate the separation of cavities.

[0030] The working principle of this utility model is as follows: The negative electrode current collector 3 is welded to the end face of the electrode tab; the protruding hole at the axis of the negative electrode current collector 3 is welded to the bottom hole of the connecting inner cylinder 7, and the sealing ring 6 seals the two. Then the connecting plate 4 is placed in, followed by the insulating plate 8. Finally, the negative electrode retaining ring 9 is placed on the top of the surface of the connecting inner cylinder 7, and then the cover plate 5 is placed in and welded to obtain the negative electrode. The battery core 2 is inserted into the cylindrical battery aluminum shell 1. The bottom reinforcing rib welding area of ​​the cylindrical battery aluminum shell 1 is welded to the battery core 2. The negative electrode of the cover plate 5 is covered, and the negative electrode sealing nail is welded. Battery fluid is injected through the connecting inner cylinder 7. When the pressure is too high, the pressure is generated on the pressure relief membrane 12 through the explosion-proof hole of the connecting plate 4. When the pressure relief membrane 12 is squeezed upward, it can push open the explosion-proof seat 10 of the explosion-proof plate 11.

[0031] 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. A novel aluminum-cased cylindrical battery structure, comprising a cylindrical battery aluminum casing (1), a battery core (2) nested inside the cylindrical battery aluminum casing (1), and a negative terminal, characterized in that, The novel aluminum-cased cylindrical battery structure also includes: The negative electrode includes a negative electrode current collector (3), a connecting plate (4), and a cover plate (5). The negative electrode current collector (3), the connecting plate (4), and the cover plate (5) are arranged sequentially from bottom to top. The edge of the cover plate (5) is welded to the negative electrode edge of the cylindrical battery aluminum shell (1) by a sealing nail. The boss assembly includes a sealing ring (6), a connecting inner cylinder (7), an insulating disc (8), and a negative electrode retaining ring (9). The inner side of the bottom of the connecting inner cylinder (7) is engaged with the protrusion at the axis of the negative electrode current collector (3). The sealing ring (6) is sleeved between the connecting inner cylinder (7) and the negative electrode current collector (3). The top of the connecting inner cylinder (7) passes through the hole at the axis of the connecting disc (4) and the cover plate (5). The insulating disc (8) is sleeved on the surface of the connecting inner cylinder (7). The negative electrode retaining ring (9) is engaged with the connecting inner cylinder (7). An explosion-proof valve is located between the connecting plate (4) and the cover plate (5).

2. The novel aluminum-cased cylindrical battery structure according to claim 1, characterized in that, The explosion-proof valve includes an explosion-proof seat (10) and an explosion-proof disc (11). The bottom of the explosion-proof seat (10) is engaged with the hole of the connecting plate (4), the top of the explosion-proof seat (10) is welded to the bottom of the explosion-proof disc (11), and the top of the explosion-proof disc (11) extends into the hole at the top of the cover plate (5).

3. The novel aluminum-cased cylindrical battery structure according to claim 2, characterized in that, The explosion-proof base (10) has a pressure relief membrane (12) bonded to its inner side, and there are two pressure relief membranes (12).

4. The novel aluminum-cased cylindrical battery structure according to claim 3, characterized in that, The top of the connecting plate (4) is provided with an explosion-proof hole, and the pressure relief membrane (12) corresponds to the explosion-proof hole.

5. The novel aluminum-cased cylindrical battery structure according to claim 1, characterized in that, The bottom of the cylindrical battery aluminum casing (1) is pressed with explosion-proof grooves (13), and there are three explosion-proof grooves (13). The interior of the explosion-proof grooves (13) is welded to the bottom of the battery core (2) through welding.

6. The novel aluminum-cased cylindrical battery structure according to claim 1, characterized in that, The top of the negative electrode current collector (3) and the bottom of the connecting plate (4) are connected by a connecting inner cylinder (7). The through hole of the connecting inner cylinder (7) is connected to the hole of the negative electrode current collector (3) and is directly connected to the center of the battery core (2).

7. The novel aluminum-cased cylindrical battery structure according to claim 1, characterized in that, The bottom of the connecting plate (4) is welded with a flow guiding arc plate (14), and there are two flow guiding arc plates (14). Two T-shaped plates are welded to the inner side of the flow guiding arc plate (14).

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