Self-pressure-relief electric core accessory structure

Abstract

The utility model discloses a self-discharge electric core accessory structure, which belongs to the technical field of lithium battery structures and comprises a sealing component and an elastic structure. By providing the accessory structure assembled on the battery cell, when the battery cell is used to a certain stage and a large amount of gas generated inside is accumulated to a certain degree, the elastic force effect of the spring component is overcome based on the internal pressure, and the internal gas can be discharged in time, so that the internal pressure of the battery is within a reasonable pressure range; the lithium precipitation risk of the battery cell is reduced; and the service life and the safety of the battery cell are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery structures, and particularly relates to a self-venting piezoelectric core fitting structure. Background Technique

[0002] The characteristics of lithium batteries, such as high energy density, no memory effect, long single-cell cycle, high efficiency, cleanliness, and no pollution, have enabled their wide application; in recent years, under the reverse effect of cost competition, new energy technologies need to continuously move closer to the direction of low cost and simple manufacturing processes. As the market's demand for fast charging grows stronger, fast charging is more likely to generate a large amount of gas; it is more necessary to timely discharge the internal gas to increase the battery life. The existing lithium battery structure lacks a corresponding pressure relief and sealing structure, seriously affecting the service life of lithium batteries. Content of the Utility Model

[0003] The purpose of the utility model is to provide a self-venting piezoelectric core fitting structure to solve the problem of the lack of a pressure relief structure in the existing lithium battery structure proposed in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A self-venting piezoelectric core fitting structure is configured at the assembly port of the core. The assembly port extends along the axis O and has an inner end and an outer end in the axial direction. The fitting structure includes:

[0005] A sealing member is installed in the assembly port and is configured as a hollow structure along the axis O. The sealing member has a closed first end and an open second end in the axial direction, and a plurality of exhaust holes are provided at the position of the first end;

[0006] An elastic structure is installed at the outer end of the assembly port and includes:

[0007] A substrate member defines an installation area communicated with the outer end of the assembly port therein, and a channel connecting the installation area and the external area is formed on the substrate member;

[0008] A spring member is arranged along the axis O, and one end of the spring member is connected to the inner wall of the substrate member;

[0009] A plugging member is connected to the end of the spring member far from the substrate member and is configured to be able to close the second end of the sealing member under the action of the spring member.

[0010] By providing a fitting structure composed of a sealing member and an elastic structure at the assembly port, when the battery cell reaches a certain stage of use, that is, when a large amount of gas generated inside accumulates to a certain extent, based on the internal pressure overcoming the elastic force of the spring member, the internal gas can be discharged in a timely manner, keeping the internal pressure of the battery within a reasonable range, reducing the risk of lithium plating in the battery cell, and increasing the service life and safety of the battery cell.

[0011] Preferably, the outer wall of the sealing member is coated with a breathable and waterproof film.

[0012] Preferably, the first end of the sealing member is a conical structure.

[0013] Preferably, the second end of the sealing member is a funnel-shaped structure, and the outer surface of the sealing member fits with the inner wall surface of the assembly port.

[0014] Preferably, the second end of the sealing member has an arc-shaped surface.

[0015] Preferably, the plugging member is a hemispherical structure.

[0016] Preferably, one end of the spring member is fixed to the inner wall of the substrate member by welding or bonding.

[0017] Preferably, the substrate member is connected to the battery cell by welding or bonding.

[0018] Preferably, the substrate member is a rectangular plate, and the channel is a cross-shaped channel.

[0019] Preferably, the spring member is a rectangular spring. Description of the Drawings

[0020] Figure 1 Schematic diagram of the installation of the fitting structure;

[0021] Figure 2 Overall cross-sectional view of the fitting structure;

[0022] Figure 3 Cross-sectional view of the sealing member;

[0023] Figure 4 Schematic diagram of the elastic structure.

[0024] In the figure:

[0025] 10. Battery cell cover; 100. Assembly port; 100a. Inner end; 100b. Outer end; 101. First section; 102. Second section;

[0026] 200. Sealing member; 200a. First end; 200b. Second end; 201. Exhaust hole; 202. Anti-disengagement chamfer; 203. Waterproof and breathable film;

[0027] 300, Substrate member; 301, Installation area; 302, Channel; 303, Spring member; 304, Plugging member. Detailed implementation manner

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0029] A self-discharging piezoelectric core fitting structure (hereinafter referred to as the fitting structure), referring to Figure 1 , this fitting structure is assembled at the exhaust port / liquid filling port position of the cell cover 10. This fitting structure is configured to maintain the seal of the exhaust port / liquid filling port position during the normal operation of the cell, and when the internal pressure of the cell increases, it allows the gas generated inside the cell to escape to maintain the stability of the internal pressure of the cell. At the same time, this fitting structure is configured to be removable to allow the replenishment of the cell electrolyte.

[0030] Specifically, referring to Figure 1 and 2 , the above-mentioned cell cover 10 has at least one exhaust port / liquid filling port (hereinafter collectively referred to as the assembly port 100). This assembly port 100 extends along the axis O and has an inner end 100a and an outer end 100b in the axial direction. Among them, the inner end 100a is configured as the end adjacent to the internal area of the cell, and the outer end 100b is arranged opposite to the inner end 100a.

[0031] Referring to Figure 2 , the above-mentioned fitting structure includes a sealing member 200 and an elastic structure. In some embodiments, referring to Figure 2 and 3 , the above-mentioned sealing member 200 is installed in the assembly port 100 and is configured as a hollow structure extending along the axis O. Specifically, this sealing member 200 has a first end 200a and a second end 200b in the direction of the axis O. Among them, the first end 200a of the sealing member 200 is configured as a closed end, and the second end 200b is configured as an open end. And the outside of the second end 200b of the sealing member 200 is in contact with the inner wall of the assembly port 100. At the same time, the above-mentioned sealing member 200 is provided with a plurality of exhaust holes 201 at the first end 200a. In some examples, the above-mentioned plurality of exhaust holes 201 are formed at the side wall position of the first end 200a of the sealing member 200 and are arranged in a circular array. During the operation of the cell, the gas inside the cell enters the sealing member 200 from the exhaust holes 201 on the sealing member 200 and acts on the plugging member 304 of the subsequent elastic structure. Continue to refer toFigure 2 , in some embodiments, a waterproof and breathable film 203 is coated on the first end 200a of the sealing member 200 to prevent the electrolyte inside the battery cell from being carried out during the exhaust process.

[0032] Continue to refer to Figure 2 , the assembly port 100 has a first section 101 and a second section 102, where the first section 101 is configured as the section adjacent to the inner end 100a of the assembly port 100, and the second section 102 is configured as the section adjacent to the outer end 100b of the assembly port 100. In some embodiments, the inner wall surface of the second section 102 is configured as an arc surface. Correspondingly, the first end 200a of the sealing member 200 is configured as a conical structure to facilitate the overall assembly of the sealing member 200. The second end 200b of the sealing member 200 is configured as a funnel-shaped structure and has an outer surface that fits the inner wall surface of the second section 102 to form a seal between the outer surface of the sealing member 200 and the inner wall surface of the assembly port 100, and can enable the subsequent hemispherical plugging member 304 to better fit the inner surface of the second end 200b of the sealing member 200, improving the sealing effect. In some embodiments, the sealing member 200 forms an anti-disengagement chamfer 202 at the middle position between the first end 200a and the second end 200b, so that the sealing member 200 can be stable inside the assembly port 100.

[0033] Refer to Figure 1 and 4 , the elastic structure is installed at the outer end 100b of the assembly port 100 and includes a substrate member 300, a spring member 303, and a plugging member 304. The substrate member 300 is fixed to the battery cell cover plate 10 by bonding or welding, and an installation interval 301 is defined therein. The installation interval 301 is configured as the assembly interval for the spring member 303 and the plugging member 304. Specifically, one end of the spring member 303 is fixed to the inner wall of the substrate member 300 by welding or bonding, and the other end is connected to the plugging member 304. Correspondingly, the plugging member 304 is configured to be able to contact the inner wall surface of the second end 200b of the sealing member 200 under the action of the spring member 303, form a closure at the second end 200b of the sealing member 200, and linearly move along the axis O under the action of the internal pressure of the battery cell to separate from the second end 200b of the sealing member 200, so that the gas flowing into the sealing member 200 can enter the installation interval 301 and flow out through the channel 302 on the subsequent substrate member 300 to achieve pressure relief of the battery cell.

[0034] Refer to Figure 4, a channel 302 is formed on the substrate member 300. The channel 302 is configured as a connection channel between the installation area 301 and the external area, that is, the gas flowing into the installation area 301 can be discharged through the channel 302. In some examples, the substrate member 300 is configured as a rectangular plate body. Correspondingly, the channel 302 is configured as a cross-shaped channel 302. At this time, the four corners of the substrate member 300 can be connected to the battery cell cover plate 10 by means of welding, bonding or the like.

[0035] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-depressurizing battery core accessory structure, configured at an assembly port of a battery core, wherein the assembly port extends along an axis O and has an inner end and an outer end in the axial direction, characterized in that: The accessory structure comprises: A sealing member is installed in the assembly port and is constituted as a hollow structure arranged along the axis O, and the sealing member has a closed first end and an open second end in the axial direction, and is provided with a plurality of exhaust holes at the first end; The elastic structure is mounted on the outer end of the assembly opening and includes: A base plate component, wherein a mounting area communicating with an outer end of the assembly port is defined therein, and a passage connecting the mounting area and the external area is formed on the base plate component; A spring component is arranged along the axis O, and one end of the spring component is connected to the inner wall of the substrate component; The blocking member is connected to one end of the spring member away from the substrate member and is configured to seal the second end of the sealing member under the action of the spring member.

2. A self-depressurizing battery core accessory structure according to claim 1, characterized in that: The outer wall of the sealing member is covered with a breathable waterproof film.

3. The self-depressurizing battery core accessory structure according to claim 1, characterized in that: The first end of the sealing member is a tapered structure.

4. A self-depressurizing battery core accessory structure according to claim 1 or 3, characterized in that: The second end of the sealing component is a funnel-shaped structure, and the outer surface of the sealing component is in contact with the inner wall surface of the assembly opening.

5. A self-depressurizing battery core accessory structure according to claim 4, characterized in that: The second end of the sealing member has an arcuate surface.

6. A self-depressurizing battery core accessory structure according to claim 1 or 5, characterized in that: The blocking component is a hemispherical structure.

7. The self-depressurizing battery core accessory structure according to claim 1, characterized in that: One end of the spring component is fixed to the inner wall of the substrate component by welding or bonding.

8. The self-depressurizing battery core accessory structure according to claim 1, characterized in that: The substrate component is connected to the battery core by welding or bonding.

9. The self-depressurizing battery core accessory structure according to claim 1, characterized in that: The substrate component is a rectangular plate body, and the channel is a cross-shaped channel.

10. The self-depressurizing battery core accessory structure according to claim 1, characterized in that: The spring member is a rectangular spring.

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