Power battery

Abstract

The utility model discloses a power battery which comprises an aluminum shell, the upper end part of the aluminum shell is of an open structure, the outer wall of the upper part of the aluminum shell radially shrinks towards the inner wall to form a shrinkage part and a limiting step, the upper end part of the shrinkage part is the upper end part of the aluminum shell, the periphery of the shrinkage part is sleeved with a reinforcing ring, and the lower end part of the reinforcing ring is supported on the limiting step; the upper end of the reinforcing ring is flush with the upper end of the contraction part, the reinforcing ring is fixedly connected with the aluminum shell, a sealing rolling groove is formed in the contraction part and the reinforcing ring, and the lower end of the reinforcing ring is located below the sealing rolling groove or located on the lower portion of the sealing rolling groove. According to the utility model, the reinforcing ring is sleeved on the outer side of the aluminum shell, so that the shell opening cannot be deformed when the production rhythm is fast, the reinforcing ring completely covers the mechanical sealing area, the structural strength of the rolling groove sealing is ensured, the aluminum shell of the power battery can replace a steel shell, the problem of deformation of the shell opening is avoided, and the structural strength of the rolling groove sealing is ensured.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a power battery. Background Art

[0002] With the increasingly serious crisis of non-renewable energy and the strong guidance of national policies, electric vehicles have become the main trend of the future development of the automobile industry. As an important component of electric vehicles, lithium-ion / sodium-ion cylindrical power batteries have the highest installed capacity in the field of electric vehicles due to their advantages such as small size, high energy density and green environmental protection. Common problems: 1. Generally, cylindrical power batteries adopt steel shell structure, which is costly and leads to heavy module weight. With people's pursuit of high endurance, module lightweighting is the next optimization direction of cylindrical power batteries; 2. Cylindrical power batteries adopt aluminum shell structure, which can reduce material cost and weight, but in the production process, the faster production rhythm is easy to cause shell mouth deformation, and the production yield brings hidden dangers and troubles; 3. Cylindrical power batteries adopt aluminum shell structure. When used for rolling groove sealing, the aluminum material is soft, resulting in low compression rate of the sealing ring of the rolling groove sealing, and weak structural strength. During vehicle vibration or roller testing, it is easy to destroy the sealing, resulting in battery leakage. Summary of the invention

[0003] The utility model aims to provide a power battery to solve the problem that when the power battery with an existing aluminum shell structure is rolled and sealed, the aluminum material is relatively soft, resulting in a low compression rate of the sealing ring of the rolling groove sealing and a weak structural strength.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a power battery, including an aluminum shell, the upper end of the aluminum shell is an open structure, the outer wall of the upper part of the aluminum shell radially shrinks toward the inner wall to form a shrinkage portion and a limiting step, the upper end of the shrinkage portion is the upper end of the aluminum shell, the outer periphery of the shrinkage portion is sleeved with a reinforcement ring, the lower end of the reinforcement ring is supported on the limiting step, the upper end of the reinforcement ring is flush with the upper end of the shrinkage portion, the reinforcement ring is fixedly connected to the aluminum shell, and a sealing rolling groove is formed on the shrinkage portion and the reinforcement ring, the lower end of the reinforcement ring is located below the sealing rolling groove or the lower end of the reinforcement ring is located below the sealing rolling groove.

[0005] Preferably, the shrinkage portion has a first thickness, the reinforcement ring has a second thickness, the thickness of the other parts of the aluminum shell except the shrinkage portion is a third thickness, and the sum of the first thickness and the second thickness is the same as the third thickness so that the outer diameter of the power battery is the same.

[0006] Preferably, the thickness of the reinforcement ring is the same as the thickness of the constriction.

[0007] Preferably, the thickness of the aluminum shell except the contraction portion is a third thickness, and the distance between the outer end of the lower end of the reinforcement ring and the outer wall of the aluminum shell below the reinforcement ring is greater than 0 and less than the third thickness.

[0008] Preferably, a first chamfer is provided on the inner side of the upper end portion of the reinforcement ring, and a second chamfer is provided on the inner side of the lower end portion of the reinforcement ring.

[0009] Preferably, the upper end of the reinforcement ring is riveted to the upper end of the aluminum shell so that the upper end of the aluminum shell is pressed onto the first chamfer.

[0010] Preferably, the reinforcement ring is made of steel or nickel.

[0011] Preferably, the power battery is a cylindrical power battery, the reinforcement ring is in a circular ring shape, and the thickness of the reinforcement ring is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0012] Preferably, a cover body is provided in the open structure at the upper end of the aluminum shell, a sealing ring is provided between the cover body and the aluminum shell, and the reinforcement ring is arranged around the cover body and the sealing ring.

[0013] Compared with the prior art, the utility model arranges a reinforcement ring sleeve on the outside of the aluminum shell to ensure that the shell mouth will not be deformed even at a faster production rhythm. The reinforcement ring completely covers the mechanical sealing area to ensure the structural strength of the rolling groove seal, thereby realizing that the aluminum shell of the power battery can replace the steel shell, avoiding the problem of shell mouth deformation and ensuring the structural strength of the rolling groove seal, thereby achieving the reduction of the material cost and weight of the cylindrical power battery, and the lightweight of the module, while avoiding the risk of battery leakage caused by the vibration of loading or the damage of the sealing during the roller test. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural diagram of a power battery according to an embodiment of the utility model.

[0015] Figure 2 This is a cross-sectional structural diagram of a power battery according to an embodiment of the utility model.

[0016] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0017] Figure 4 This is a structural diagram of an aluminum shell without a reinforcement ring installed in an embodiment of the utility model. At this time, a sealing rolling groove is not yet provided on the aluminum shell.

[0018] Figure 5 This is a structural diagram of the reinforcement ring of an embodiment of the utility model.

[0019] Figure 6This is a structural diagram of the aluminum shell after the reinforcement ring is assembled in the embodiment of the utility model. At this time, the sealing rolling groove is not yet set on the aluminum shell.

[0020] Figure 7 for Figure 6 Enlarged view of point B in the middle. DETAILED DESCRIPTION

[0021] In order to explain the technical content, structural features and effects achieved by the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0022] like Figures 1 to 7 As shown, an embodiment of the utility model provides a power battery 10, including an aluminum shell 1, the upper end of the aluminum shell 1 is an open structure, the outer wall of the upper part of the aluminum shell 1 radially shrinks toward the inner wall to form a shrinkage portion 11 and a limiting step 12, the upper end of the shrinkage portion 11 is the upper end of the aluminum shell 1, the outer periphery of the shrinkage portion 11 is sleeved with a reinforcement ring 2, the lower end of the reinforcement ring 2 is supported on the limiting step 12, the upper end of the reinforcement ring 2 is flush with the upper end of the shrinkage portion 11, the reinforcement ring 2 is fixedly connected to the aluminum shell 1, and a sealing rolling groove 3 is formed on the shrinkage portion 11 and the reinforcement ring 2, and the lower end of the reinforcement ring 2 is located at the lower part of the sealing rolling groove 3. Specifically, the aluminum shell 1 is made of aluminum or aluminum alloy. The aluminum shell 1 is a hollow structure and the upper end is an open structure to facilitate the installation of bare battery cells and other components in the aluminum shell 1. The inner wall of the reinforcement ring 2 fits the outer wall of the contraction portion 11. The aluminum shell 1 without the contraction portion 11 and the limiting step 12 formed with the sealing groove 3 can be directly stretched by a progressive die. The upper end of the reinforcement ring 2 is flush with the upper end of the contraction portion 11, and the lower end of the reinforcement ring 2 is located below the sealing groove 3 or the lower end of the reinforcement ring 2 is located below the sealing groove 3, which ensures that the reinforcement ring 2 completely covers the mechanical sealing area and ensures the structural strength of the groove sealing area of ​​the power battery 10. Of course, in some other embodiments, the lower end of the reinforcement ring 2 can also be located below the sealing groove 3. This setting can also reinforce the upper part of the aluminum shell 1, and the structural strength of the power battery 10 is also enhanced.

[0023] In the embodiment of the utility model, the reinforcement ring 2 is sleeved on the outside of the aluminum shell 1 to ensure that the shell mouth will not be deformed even at a faster production rhythm. The reinforcement ring 2 completely covers the mechanical sealing area to ensure the structural strength of the rolling groove seal, so that the aluminum shell 1 of the power battery 10 can replace the steel shell, avoid the problem of shell mouth deformation and ensure the structural strength of the rolling groove seal, thereby achieving the reduction of material cost and weight of the cylindrical power battery 10, and lightweighting of the module, while avoiding the risk of battery leakage caused by loading vibration or roller test damaging the sealing.

[0024] In the embodiment of the utility model, Figure 6 to Figure 7As shown, the contraction portion 11 has a first thickness, the reinforcement ring 2 has a second thickness T1, and the thickness of the other parts of the aluminum shell 1 except the contraction portion 11 is a third thickness T2. The sum of the first thickness and the second thickness T1 is the same as the third thickness T2 so that the outer diameter of the power battery 10 is the same, thereby making the appearance of the battery neater. Further, the thickness of the reinforcement ring 2 is the same as the thickness of the contraction portion 11, that is, the first thickness is equal to the second thickness T1 so that the reinforcement ring 2 is better and more stably supported on the limiting step 12, and the strength of the power battery 10 is higher and the processing is more convenient.

[0025] In the embodiment of the utility model, Figure 3 Shown and Figure 7 As shown, the thickness of the other parts of the aluminum shell 1 except the contraction part 11 is the third thickness T2, and the distance D between the outer end of the lower end of the reinforcement ring 2 and the outer wall of the aluminum shell 1 below the reinforcement ring 2 is greater than 0 and less than the third thickness T2. Specifically, the distance D between the outer end of the lower end of the reinforcement ring 2 and the outer wall of the aluminum shell 1 below the reinforcement ring 2 is set to be greater than 0 and less than the third thickness, so that the reinforcement ring 2 is better supported by the aluminum shell 1 below the reinforcement ring 2, and the material of the reinforcement ring 2 is more saved.

[0026] In the embodiment of the utility model, Figure 2 As shown, a first chamfer 21 is provided on the inner side of the upper end of the reinforcement ring 2, and a second chamfer 22 is provided on the inner side of the lower end of the reinforcement ring 2. The first chamfer 21 and the second chamfer 22 are both R angles, and the installation of the reinforcement ring 2 can be facilitated by the arrangement of the first chamfer 21 and the second chamfer 22.

[0027] Furthermore, if Figure 7 As shown, the upper end of the reinforcement ring 2 is riveted to the upper end of the aluminum shell 1 and the upper end of the aluminum shell 1 is pressed on the first chamfer 21 to limit the reinforcement ring 2. The design and installation are very clever, and the installation structure of the reinforcement ring 2 is more stable.

[0028] In the embodiment of the present invention, the material of the reinforcement ring 2 is steel or nickel. Of course, the specific material of the reinforcement ring 2 is not limited, as long as it has a certain strength and can be used in the battery field.

[0029] In the embodiment of the utility model, the power battery 10 is a cylindrical power battery, the reinforcement ring 2 is in a circular ring shape, and the thickness of the reinforcement ring 2 is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

[0030] In the embodiment of the utility model, Figures 1 to 3As shown, a cover body 4 is provided in the open structure at the upper end of the aluminum shell 1, a sealing ring 5 is provided between the cover body 4 and the aluminum shell 1, and a reinforcement ring 2 is provided around the cover body 4 and the sealing ring 5. Specifically, the cover body 4 is used to close the open structure of the aluminum shell 1, and a sealing ring 5 is provided between the cover body 4 and the aluminum shell 1 to ensure the sealing performance of the power battery 10. By placing the reinforcement ring 2 around the compression position of the sealing ring 5 and the position of the sealing rolling groove 3, the structural strength of the rolling groove sealing is effectively ensured.

[0031] The assembly method of the power battery 10 of the utility model is as follows: first, the aluminum shell 1 with a shrunken outer diameter, a thinned wall thickness, and a limiting step 12 is directly stretched and formed through a progressive die according to a preset size. At this time, the structure of the aluminum shell 1 is as follows Figure 4 As shown, at the same time, the reinforcement ring 2 is formed by stamping or stretching according to the preset size. The structure of the reinforcement ring is as shown in Figure 5 As shown; then the reinforcement ring 2 is set on the outside of the contraction portion 11 of the aluminum shell 1, the lower part of the reinforcement ring 2 is limited and adapted to the limit step 12, and then the shell mouth of the aluminum shell 1 is riveted outward, and the first chamfer 21 on the upper part of the reinforcement ring 2 is filled and limited, as shown in detail Figure 6 and Figure 7 As shown; the bare cell is subsequently welded normally, and the reinforcement ring 2 and the shrinkage portion 11 are mechanically grooved to form a sealing groove 3 to seal the power battery 10, as shown in detail. Figures 1 to 3 As shown, the power battery 10 is assembled normally according to other steps.

[0032] The above disclosure is only a preferred example of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A power battery, characterized in that: It includes an aluminum shell, the upper end of which is an open structure, the outer wall of the upper part of the aluminum shell radially shrinks toward the inner wall to form a shrinkage portion and a limiting step, the upper end of the shrinkage portion is the upper end of the aluminum shell, and a reinforcement ring is provided on the outer periphery of the shrinkage portion, the lower end of the reinforcement ring is supported on the limiting step, the upper end of the reinforcement ring is flush with the upper end of the shrinkage portion, the reinforcement ring is fixedly connected to the aluminum shell, and a sealing rolling groove is formed on the shrinkage portion and the reinforcement ring, the lower end of the reinforcement ring is located below the sealing rolling groove or the lower end of the reinforcement ring is located below the sealing rolling groove.

2. The power battery according to claim 1, characterized in that: The contraction portion has a first thickness, the reinforcement ring has a second thickness, the thickness of the aluminum shell other than the contraction portion is a third thickness, and the sum of the first thickness and the second thickness is the same as the third thickness so that the outer diameter of the power battery is the same.

3. The power battery according to claim 1, characterized in that: The thickness of the reinforcement ring is the same as the thickness of the constriction.

4. The power battery according to claim 1, characterized in that: The thickness of the aluminum shell except the contraction portion is a third thickness, and the distance between the outer end of the lower end of the reinforcement ring and the outer wall of the aluminum shell below the reinforcement ring is greater than 0 and less than the third thickness.

5. The power battery according to claim 1, characterized in that: A first chamfer is provided on the inner side of the upper end of the reinforcement ring, and a second chamfer is provided on the inner side of the lower end of the reinforcement ring.

6. The power battery according to claim 5, characterized in that: The upper end of the reinforcement ring is riveted to the upper end of the aluminum shell so that the upper end of the aluminum shell is pressed on the first chamfer.

7. The power battery according to claim 1, characterized in that: The reinforcement ring is made of steel or nickel.

8. The power battery according to claim 1, characterized in that: The power battery is a cylindrical power battery, the reinforcement ring is in a circular ring shape, and the thickness of the reinforcement ring is greater than or equal to 0.1 mm and less than or equal to 0.4 mm.

9. The power battery according to claim 1, characterized in that: A cover body is arranged in the open structure at the upper end of the aluminum shell, a sealing ring is arranged between the cover body and the aluminum shell, and the reinforcement ring is arranged around the cover body and the sealing ring.

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