CN217361751U - A plastic structure under a secondary battery - Google Patents

Abstract

The utility model relates to a plastic structure under a secondary battery. The structure comprises a top cover sheet with a pole hole, a pole arranged in the pole hole, a support ring, and a top cover piece and a pole arranged in close contact with the top cover and the pole in sequence. The upper plastic, the sealing ring and the lower plastic are formed in the gap with the support ring, and the lower plastic is provided with a ventilation groove for releasing the sealing of the lower plastic. The abnormality of the top cover is detected by the existing helium detection test, and there is no need to increase the test and the processing difficulty is small.

Description

A plastic structure under a secondary battery

technical field

The utility model relates to the field of secondary batteries, in particular to a plastic structure under the secondary battery.

Background technique

Rechargeable battery, also known as rechargeable battery or accumulator, refers to a battery that can continue to be used by activating the active material by charging after the battery is discharged. Using the reversibility of chemical reactions, a new battery can be formed, that is, when a chemical reaction is converted into electrical energy, the chemical system can be repaired with electrical energy, and then the chemical reaction can be used to convert into electrical energy, so it is called a secondary battery (can be Rechargeable Battery).

As shown in Fig. 4, in the prior art, the top cover is sealed by a sealing ring to separate the inside of the battery from the outside world to prevent the overflow of objects in the battery. When riveting, the top cover sheet and the pole on both sides of the sealing ring are squeezed and deformed to form a sealing area. The compressed lower plastic may form a sealing pair with the top cover and the pole. In addition to forming a seal in the sealing area of the sealing ring, the lower plastic After being compressed, it will also form a seal in the lower plastic sealing area, but when the sealing ring is missing, due to the sealing formed by the lower plastic, it will cause the problem of not detecting air leakage, so that the sealing of the lower plastic cannot meet the battery sealing requirements.

Utility model content

The purpose of the present invention is to provide a plastic structure under the secondary battery in order to overcome the above-mentioned defects of the prior art.

The purpose of the present utility model can be achieved through the following technical solutions:

A plastic structure under a secondary battery, the structure comprises a top cover sheet with a pole hole, a pole set in the pole hole, a support ring, and a top cover piece, a pole and a support ring that are arranged in close contact with each other in sequence. The upper plastic, the sealing ring and the lower plastic in the gap are provided with a ventilation groove for releasing the sealing of the lower plastic.

The sealing ring is composed of an outer sealing part and an inner inserting part.

The lower plastic is composed of an outer support part and an inner compressed part.

The outer sealing part of the sealing ring and the inner compressed part of the lower plastic are tightly fitted together.

The pole column includes a lower base, a connecting part arranged in the middle of the lower base, and a boss arranged on the upper surface of the connecting part, and the lower part of the boss is provided with an outward protrusion.

The inner compressed part of the lower plastic is provided with a ventilation groove in the area in contact with the surface of the pole, which is used to release the sealing of the contact position between the pole and the inner compressed part, and the length of the ventilation groove is greater than or equal to the inner compressed part. The length of the part that coincides with the surface of the pole.

The inner compressed portion of the lower plastic is provided with a ventilation groove in the area in contact with the top cover sheet for releasing the sealing of the contact position between the top cover sheet and the inner compressed portion.

The upper plastic includes a first upper plastic ring, a second upper plastic ring and a third upper plastic ring which are integrally formed from the outside to the inside. The first upper plastic ring, the second upper plastic ring and the third upper plastic ring The upper side is flush, and its thickness increases sequentially.

The inner side of the lower surface of the third upper plastic ring of the upper plastic is provided with an upper plastic annular groove, and the upper surface of the sealing ring is provided with an annular protrusion at the corresponding position of the annular groove of the upper plastic. The protrusions fit closely with the upper plastic annular groove.

The outer sealing part of the sealing ring and the inner compressed part of the lower plastic are closely attached to each other.

Compared with the prior art, the utility model has the following advantages:

1. In the present invention, the ventilation groove is arranged in the lower plastic, so that the abnormality of the top cover can be detected through the existing helium detection test when the sealing ring is missing, without the technical effect of increasing the test;

2. The ventilation groove added by the utility model has the advantages of simple structure, small processing difficulty and easy molding.

Description of drawings

FIG. 1 is a partial cross-sectional view of a ventilation groove opened on the lower plastic according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of another ventilation groove opened on the lower plastic according to the embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of a ventilation groove in an embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a conventional lower plastic.

Among them: 1. pole, 2. support ring, 3. upper plastic, 4. sealing ring, 5. top cover sheet, 6. lower plastic, 7. vent hole, 8. effective sealing area of sealing ring, 9. lower plastic Sealing area, 10. Sealing area of sealing ring, 11. Riveting position.

Detailed ways

The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

Example

The utility model provides a pole structure of a secondary battery, which comprises a top cover sheet 5 with a pole hole, a pole 1 arranged in the pole hole, a support ring 2, and a top cover arranged in close contact with each other in sequence. The sheet 5 , the pole 1 and the support ring 2 form the upper plastic 3 , the sealing ring 4 and the lower plastic 6 in the gap. The lower plastic 6 is provided with a ventilation groove 7 for releasing the sealing of the lower plastic 6 .

The sealing ring 4 is composed of an outer sealing part and an inner embedded part, and the lower plastic 6 is composed of an outer supporting part and an inner compressed part. The outer sealing part of the lower plastic 6 and the inner compressed part of the lower plastic 6 are closely adhered to each other. The upper side is an annular inclined surface inclined from outside to inside, and the lower side is an annular vertical surface.

The pole 1 includes a lower base, a connecting portion and a boss arranged from bottom to top, and the lower part of the boss is provided with an outward protrusion.

The upper plastic 3 includes a first upper plastic ring, a second upper plastic ring and a third upper plastic ring which are integrally formed from the outside to the inside. The upper sides of the first upper plastic ring, the second upper plastic ring and the third upper plastic ring are flush , and its thickness increases in turn, and the inner side of the lower surface of the third upper plastic ring of the upper plastic 3 is provided with an upper plastic annular groove, and the upper surface of the sealing ring 4 is provided with an annular protrusion at the corresponding position of the annular groove of the upper plastic 3 up, the annular protrusion and the upper plastic annular groove fit tightly.

The lower plastic 6 and the sealing ring 4 are compressed by the pole 1 and the top cover 5 to seal the sealing ring 4. The compressed part of the lower plastic 6 and the sealing ring 4 are compressed by the pole 1 and the top cover 5. The compressed part of the inner side of the lower plastic 6 is slotted to set it as an unsealed structure, and only the sealing ring 4 is kept for sealing.

As shown in Figure 1 and Figure 2, the present utility model provides two ways of opening the ventilation groove 7:

1. In the area where the compressed part on the inner side of the lower plastic 6 is in contact with the surface of the pole 1, a ventilation groove 7 longer than the length that overlaps with the surface of the pole 1 is opened, so as to realize the contact between the compressed part on the inner side of the pole 1 and the lower plastic 6 position to unseal;

2. A ventilation groove 7 is provided in the area where the compressed part inside the lower plastic 6 is in contact with the top cover sheet 5, so as to release the seal at the position where the top cover sheet 5 and the compressed part inside the lower plastic 6 contact.

And the length of the ventilation groove 7 is not less than the compressed length of the lower plastic 6. When the ventilation groove 7 is opened on the lower plastic surface that is in contact with the lower plastic and the pole, the compressed length refers to the compressed length between the lower plastic and the pole. 7 When it is opened on the lower plastic surface where the lower plastic and the top cover are in contact, the compressed length refers to the compressed length of the lower plastic and the top cover.

When the sealing ring 4 is installed, the lower plastic structure will not affect the original function in the normal state, that is, the ventilation groove 7 will not affect the expected sealing performance. An air leak was detected during the test.

The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited to this. Any person familiar with the technical field can easily think of various Equivalent modifications or replacements should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a plastic structure under secondary cell, its characterized in that, this structure is including top cap piece (5) of seting up the utmost point post hole, set up utmost point post (1), support ring (2) in the utmost point post hole and hug closely in proper order and set up last plastic (3), sealing washer (4) and lower plastic (6) in top cap piece (5), utmost point post (1) and support ring (2) formation space, lower plastic (6) be equipped with and be used for relieving lower plastic (6) sealed air channel (7).

2. The plastic structure under secondary battery according to claim 1, wherein the gasket (4) is composed of an outer sealing portion and an inner insertion portion.

3. The lower plastic structure of the secondary battery according to claim 2, wherein the lower plastic (6) is composed of an outer support part and an inner compressed part.

4. The plastic structure under secondary battery according to claim 3, characterized in that the outside sealing portion of the sealing ring (4) and the inside compressed portion of the lower plastic (6) are fitted and attached.

5. The plastic structure under secondary battery according to claim 4, wherein the terminal post (1) comprises a lower base, a connecting portion disposed in the middle of the lower base, and a boss disposed on the upper surface of the connecting portion, and the lower portion of the boss is provided with an outward protrusion.

6. The plastic structure under the secondary battery according to claim 5, characterized in that the inner compressed part of the lower plastic (6) is provided with a vent groove (7) in the contact area with the surface of the post (1) for releasing the seal of the contact position between the post (1) and the inner compressed part, and the length of the vent groove (7) is equal to or greater than the length of the overlap between the inner compressed part and the surface of the post (1).

7. The plastic structure under secondary battery according to claim 5, characterized in that the inner compressed part of the lower plastic (6) is provided with a vent groove (7) in the contact area with the top cover sheet (5) for releasing the seal of the contact position of the top cover sheet (5) and the inner compressed part.

8. The lower plastic structure for the secondary battery according to claim 5, wherein the upper plastic (3) comprises a first upper plastic ring, a second upper plastic ring and a third upper plastic ring which are integrally formed from outside to inside, and the upper sides of the first upper plastic ring, the second upper plastic ring and the third upper plastic ring are flush with each other and the thicknesses of the first upper plastic ring, the second upper plastic ring and the third upper plastic ring increase in sequence.

9. The plastic structure under secondary battery according to claim 8, characterized in that the third upper plastic ring of the upper plastic (3) has an upper plastic ring groove on the inner side of its lower surface, the upper surface of the sealing ring (4) has an annular protrusion at the position corresponding to the upper plastic ring groove of the upper plastic (3), and the annular protrusion and the upper plastic ring groove are fitted tightly.

10. The lower plastic structure for the secondary battery according to claim 4, wherein the upper side of the contact surface where the outer sealing portion of the sealing ring (4) and the inner compressed portion of the lower plastic (6) are engaged and contacted is an annular inclined surface inclined from outside to inside, and the lower side of the contact surface is an annular vertical surface.

Images