An exhaust bayonet

Abstract

The application provides an exhaust bayonet, belonging to the technical field of soft package batteries, comprising a bayonet body, a blade part provided at the front end of the bayonet body, a connecting part provided at the rear end of the bayonet body, and a rotating roller provided at the middle part of the bayonet body, wherein the axis direction of the rotating roller is perpendicular to the piercing direction of the bayonet body, and the circumferential arc surfaces of the rotating roller are respectively protruded from the upper end surface and the lower end surface of the bayonet body. The exhaust bayonet provided by the application moves forward, pierces the aluminum plastic film by the blade part, and separates the upper aluminum plastic film and the lower aluminum plastic film in the piercing area by the rotating roller passing through the piercing area. When the bayonet body is pulled out backward from the piercing area, the rotating roller passes through the piercing area again, rubs the upper aluminum plastic film and the lower aluminum plastic film in the piercing area, further separates the two layers of aluminum plastic films, avoids the situation that the two layers of aluminum plastic films are too tightly adhered to be opened, ensures the smooth exhaust of the gas in the battery, and guarantees the subsequent charge-discharge performance of the battery.

Description

Technical Field

[0001] This invention belongs to the field of soft-pack battery technology, and more specifically, relates to an exhaust bayonet. Background Technology

[0002] Degassing, the final processing step in the production of pouch lithium-ion batteries, plays a crucial role in gas extraction and shaping. During the formation and pre-charge process, the gas generated during SEI (solid electrolyte interface) film formation must be completely removed in this step. Incomplete removal will increase the spacing between the internal electrodes, thus affecting the battery's charge / discharge interface and performance.

[0003] Currently, soft-pack degassing typically uses a vertical venting method. First, a piercing tool is used to puncture the aluminum-plastic film, and then vacuuming is used to vent the gas. However, after puncturing the aluminum-plastic film with a piercing tool, the two layers of aluminum-plastic film may adhere too tightly and cannot be opened, resulting in poor gas venting inside the battery. After degassing, residual gas remains inside the battery, affecting subsequent battery charging and discharging performance. Summary of the Invention

[0004] The purpose of this invention is to provide a venting piercing tool, which aims to solve the problem that after using the piercing tool to puncture the aluminum-plastic film, the two layers of aluminum-plastic film will be too tightly adhered and cannot be opened, resulting in poor gas venting inside the battery. After degassing, there will still be residual gas inside the battery, which will affect the subsequent battery charging and discharging performance.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a venting bayonet is provided, comprising a bayonet body, a cutting edge at the front end of the bayonet body, a connecting part at the rear end of the bayonet body, and a rotating roller at the middle of the bayonet body. The axial direction of the rotating roller is perpendicular to the piercing direction of the bayonet body, and the circumferential arc surface of the rotating roller protrudes from the upper and lower end surfaces of the bayonet body, respectively.

[0006] In one possible implementation, a first strip-shaped hole is provided in the middle of the bayonet body, the length direction of the first strip-shaped hole is perpendicular to the piercing direction of the bayonet body, and the rotating roller is installed in the first strip-shaped hole along the length direction of the first strip-shaped hole via a central shaft.

[0007] In one possible implementation, anti-slip textures are formed on the circumferential arc surface of the rotating roller.

[0008] In one possible implementation, the front end of the bayonet body is provided with two inclined surfaces symmetrically arranged on the left and right. The inclined surfaces are inclined forward from the upper end surface of the bayonet body toward the lower end surface. The two inclined surfaces respectively form the blade with the lower end surface of the bayonet body. The blade is provided with a first serration along its length direction.

[0009] In one possible implementation, a fixed spreading component and an elastic spreading component are further provided in the middle of the bayonet body. Both the fixed spreading component and the elastic spreading component are located between the blade and the rotating roller. The fixed spreading component is located on the lower end face of the bayonet body and is used to spread the lower aluminum-plastic film of the bayonet body. The elastic spreading component is used to spread the upper aluminum-plastic film of the bayonet body after the bayonet body pierces the aluminum-plastic film.

[0010] In one possible implementation, the fixed support assembly includes a plurality of protrusions arranged in a matrix on the lower end face of the bayonet body. The length of the plurality of protrusions arranged along the width direction of the bayonet body is greater than the axial length of the rotating roller, and the length of the plurality of protrusions arranged along the length direction of the bayonet body is greater than the diameter of the rotating roller.

[0011] In one possible implementation, the bump is a cone-shaped block, the cross-sectional area of ​​which gradually decreases from top to bottom.

[0012] In one possible implementation, the elastic spreading assembly includes a second strip-shaped hole, a rotating shaft, a support block, and a return spring. The second strip-shaped hole is formed on the bayonet body, and the length direction of the second strip-shaped hole is perpendicular to the piercing direction of the bayonet body. The rotating shaft is installed in the second strip-shaped hole along its length direction. The support block is installed on the rotating shaft and protrudes from the upper end face of the bayonet body. The return spring is installed on the inner side wall of the second strip-shaped hole away from the blade and is used to provide a restoring force to the support block to rotate toward one end of the blade.

[0013] In one possible implementation, the upper end face of the support block has a guide slope that slopes upward from front to back, the rear end face of the support block has a force-bearing slope that slopes forward from top to bottom, the inner sidewall of the second strip hole away from the blade has a support slope that slopes forward from top to bottom, the support slope and the force-bearing slope are arranged parallel to each other, and the return spring is connected between the support slope and the force-bearing slope.

[0014] In one possible implementation, the guide ramp and the force-bearing ramp form the rear end angle of the support block, and the rear end angle is provided with a second serration along the width direction.

[0015] The beneficial effects of the exhaust bayonet provided by this invention are as follows: Compared with the prior art, the bayonet body has a cutting edge at the front end and a connecting part at the rear end. The bayonet body is mounted on a corresponding driving component through the connecting part, enabling the bayonet body to move back and forth. As the bayonet body moves forward, the cutting edge pierces the aluminum-plastic film. As the bayonet body continues to move forward, the rotating roller passes through the pierced area of ​​the aluminum-plastic film, separating the upper and lower layers of the aluminum-plastic film in the pierced area. When the bayonet body is pulled back from the pierced area, the rotating roller passes through the pierced area of ​​the aluminum-plastic film again, rubbing against the upper and lower layers of the aluminum-plastic film in the pierced area, further separating the two layers of aluminum-plastic film. This avoids the two layers of aluminum-plastic film being too tightly adhered and unable to open, ensuring smooth exhaust of gas inside the battery and guaranteeing subsequent battery charging and discharging performance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A three-dimensional view of an exhaust bayonet provided in an embodiment of the present invention;

[0018] Figure 2 A bottom view of an exhaust bayonet provided in an embodiment of the present invention;

[0019] Figure 3 A three-dimensional view of the support block provided in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 100. Bayonet body; 110. Blade; 111. Inclined surface; 112. First serration; 120. Connecting part;

[0022] 200. Rotating roller; 210. First strip hole; 220. Central shaft; 230. Anti-slip texture;

[0023] 300. Fixed support component; 310. Protrusion;

[0024] 400, Elastic expansion assembly; 410, Second strip hole; 411, Supporting inclined surface; 420, Rotating shaft; 430, Support block; 431, Guide inclined surface; 432, Force-bearing inclined surface; 433, Second sawtooth; 434, Insertion hole; 435, Limiting surface; 440, Return spring. Detailed Implementation

[0025] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0026] Please see Figure 1 and Figure 2 The present invention will now describe a venting bayonet. A venting bayonet includes a bayonet body 100, a blade 110 at the front end of the bayonet body 100, a connecting portion 120 at the rear end of the bayonet body 100, and a rotating roller 200 at the middle of the bayonet body 100. The axial direction of the rotating roller 200 is perpendicular to the piercing direction of the bayonet body 100, and the circumferential arc surfaces of the rotating roller 200 protrude from the upper and lower end surfaces of the bayonet body 100, respectively.

[0027] This invention provides a venting bayonet. Compared with the prior art, the bayonet body 100 has a blade 110 at its front end and a connecting part 120 at its rear end. The bayonet body 100 is mounted on a corresponding driving component via the connecting part 120, enabling the bayonet body 100 to move back and forth. When the bayonet body 100 moves forward, the blade 110 pierces the aluminum-plastic film. As the bayonet body 100 continues to move forward, the rotating roller 200 passes through the pierced area of ​​the aluminum-plastic film, separating the upper and lower layers of the aluminum-plastic film. When the bayonet body 100 is pulled back from the pierced area, the rotating roller 200 passes through the pierced area again, rubbing against the upper and lower layers of the aluminum-plastic film to further separate them. This prevents the two layers of aluminum-plastic film from sticking too tightly together and being unable to open, ensuring smooth venting of gas inside the battery and guaranteeing subsequent battery charging and discharging performance.

[0028] A first strip-shaped hole 210 is provided in the middle of the bayonet body 100. The length direction of the first strip-shaped hole 210 is perpendicular to the piercing direction of the bayonet body 100. A rotating roller 200 is installed in the first strip-shaped hole 210 along the length direction of the first strip-shaped hole 210 via a central shaft 220. The first strip-shaped hole 210 is a through hole. The diameter of the rotating roller 200 is larger than the thickness of the bayonet body 100. After the rotating roller 200 is installed in the first strip-shaped hole 210, the circumferential arc surface of the rotating roller 200 protrudes from the upper and lower end surfaces of the bayonet body 100, respectively, and the height of the protrusion is the same.

[0029] Preferably, the diameter of the rotating roller 200 is 3.5 mm, the thickness of the bayonet body 100 is 2 mm, the rotating roller 200 is installed in the first strip hole 210, and the height of the upper and lower protrusions is 0.75 mm.

[0030] To improve the friction of the rotating roller 200, anti-slip texture 230 is provided on the circumferential arc surface of the rotating roller 200. The anti-slip texture 230 is a spiral texture and is spirally arranged along the outer circumference of the rotating roller 200.

[0031] Please refer to Figure 1 The bayonet body 100 has two symmetrical inclined surfaces 111 at its front end. The inclined surfaces 111 are inclined forward from the upper end of the bayonet body 100 to the lower end. The two inclined surfaces 111 form a blade 110 with the lower end of the bayonet body 100. The blade 110 has a pointed tip in the middle and its thickness increases from front to back, which facilitates piercing the aluminum-plastic film.

[0032] The blade 110 is provided with first serrations 112 along its length. The length of the first serrations 112 on both sides is the tip that extends to the middle of the blade 110. When the tip pierces the aluminum-plastic film, as the blade 110 continues to penetrate the aluminum-plastic film, the first serrations 112 on both sides continuously cut the aluminum-plastic film, so that the cut gradually increases. The aluminum-plastic film cut by the first serrations 112 is relatively rough, which can reduce the occurrence of the upper and lower aluminum-plastic films being tightly adhered again.

[0033] In some embodiments, a fixed spreading component 300 and an elastic spreading component 400 are further provided in the middle of the bayonet body 100. The fixed spreading component 300 and the elastic spreading component 400 are both provided between the blade 110 and the rotating roller 200. The fixed spreading component 300 is provided on the lower end face of the bayonet body 100 and is used to spread the lower aluminum-plastic film of the bayonet body 100. The elastic spreading component 400 is used to spread the upper aluminum-plastic film of the bayonet body 100 after the bayonet body 100 punctures the aluminum-plastic film.

[0034] For details, please refer to Figure 2 The fixed support assembly 300 includes multiple protrusions 310, which are arranged in a matrix on the lower end face of the bayonet body 100. The multiple protrusions 310 form a matrix area. The length of the matrix area along the width direction of the bayonet body 100 is greater than the axial length of the rotating roller 200, which can increase the contact width with the lower aluminum-plastic film. The length of the matrix area along the length direction of the bayonet body 100 is greater than the diameter of the rotating roller 200, which can increase the contact length with the lower aluminum-plastic film, further ensuring that the lower aluminum-plastic film can be separated as much as possible and avoid adhering to the upper aluminum-plastic film.

[0035] Optionally, the protrusion 310 is a conical block with a cross-sectional area that gradually decreases from top to bottom. The tip of the conical block presses down on the lower aluminum-plastic film, which will create multiple scratches on the lower aluminum-plastic film. These scratches will cause the lower aluminum-plastic film to deform. Even if it comes into contact with the upper aluminum-plastic film, it will not fit tightly and will easily separate.

[0036] In some embodiments, please refer to Figure 1 The elastic expansion assembly 400 includes a second strip hole 410, a rotating shaft 420, a support block 430, and a return spring 440. The second strip hole 410 is formed on the bayonet body 100, and the length direction of the second strip hole 410 is perpendicular to the piercing direction of the bayonet body 100. The rotating shaft 420 is installed in the second strip hole 410 along the length direction of the second strip hole 410. The support block 430 is installed on the rotating shaft 420 and protrudes from the upper end face of the bayonet body 100. The return spring 440 is installed on the inner side wall of the second strip hole 410 away from the blade 110, and is used to provide the support block 430 with a rebound force to rotate toward one end of the blade 110.

[0037] As the bayonet body 100 pierces the aluminum-plastic film and continues to penetrate, it reaches the support block 430. The support block 430 then pushes the pierced upper aluminum-plastic film upwards. Under the action of the return spring 440, the support block 430 is squeezed by the upper aluminum-plastic film and rotates away from the blade 110, but it is ensured that it always protrudes from the upper surface of the bayonet body 100. When the upper aluminum-plastic film has completely passed through the support block 430, the support block 430 rotates back towards the blade 110 under the action of the return spring 440. When the bayonet body 100 is withdrawn after piercing, the support block 430 will push the upper aluminum-plastic film open again. This time, the opening angle is greater than the opening angle when it entered, ensuring that it does not stick to the lower aluminum-plastic film.

[0038] Optionally, the support block 430 includes multiple blocks, which are installed at equal intervals along the axial direction of the rotation shaft 420.

[0039] For details, please refer to Figure 3 The upper surface of the support block 430 has a guide slope 431 that slopes upwards from front to back. The guide slope 431 has multiple segments, and the inclination angles of the multiple guide slopes 431 to the vertical plane increase sequentially. When the bayonet body 100 pierces the aluminum-plastic film, it can smoothly guide the pierced upper aluminum-plastic film to pass smoothly through the support block 430 and continuously expand the upper aluminum-plastic film upwards. When the bayonet body 100 is pulled out, it can ensure that the upper aluminum-plastic film maintains the maximum expansion angle. The rear end face of the support block 430 has a force-bearing inclined surface 432 that slopes from top to bottom and forward. The inner side wall of the second strip hole 410 away from the blade 110 has a support inclined surface 411 that slopes from top to bottom and forward. The support inclined surface 411 is arranged parallel to the force-bearing inclined surface 432. An insertion hole 434 is vertically opened on the force-bearing inclined surface 432. One end of the return spring 440 is welded or hung on the support inclined surface 411, and the other end is inserted into the insertion hole 434.

[0040] Furthermore, a forward-extending limiting block is provided at the front end of the support block 430. The lower end face of the limiting block has a limiting surface 435. When the return spring 440 is in a compressed state, the limiting surface 435 horizontally overlaps the upper end face of the bayonet body 100 in front of the second strip hole 410, which can keep the support block 430 in a stable state. At the same time, during the process of withdrawing the bayonet body 100, the limiting surface 435 can also limit the rotation of the support block 430, which can stably open the upper aluminum-plastic film.

[0041] Preferably, the guide slope 431 and the force-bearing slope 432 form the rear end corner of the support block 430, and the rear end corner is provided with a second serration 433 along the width direction. The second serration 433 can also form multiple scratches on the upper aluminum-plastic film. Multiple scratches will cause the upper aluminum-plastic film to deform. Even if it comes into contact with the lower aluminum-plastic film, it will not be tightly adhered and can be easily separated.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A venting bayonet, characterized in that, The device includes a bayonet body (100), the front end of which is provided with a blade (110), the rear end of which is provided with a connecting part (120), and the middle part of which is provided with a rotating roller (200). The axial direction of the rotating roller (200) is perpendicular to the piercing direction of the bayonet body (100), and the circumferential arc surface of the rotating roller (200) protrudes from the upper end surface and the lower end surface of the bayonet body (100). The bayonet body (100) is further provided with a fixed spreading component (300) and an elastic spreading component (400) in the middle. The fixed spreading component (300) and the elastic spreading component (400) are both located between the blade (110) and the rotating roller (200). The fixed spreading component (300) is located on the lower end face of the bayonet body (100) and is used to spread the lower aluminum-plastic film of the bayonet body (100). The elastic spreading component (400) is used to spread the upper aluminum-plastic film of the bayonet body (100) after the bayonet body (100) punctures the aluminum-plastic film.

2. The exhaust bayonet as described in claim 1, characterized in that, The bayonet body (100) has a first strip hole (210) in the middle. The length direction of the first strip hole (210) is perpendicular to the piercing direction of the bayonet body (100). The rotating roller (200) is installed in the first strip hole (210) along the length direction of the first strip hole (210) via a central shaft (220).

3. The exhaust bayonet as described in claim 2, characterized in that, The rotating roller (200) has anti-slip texture (230) on its circumferential arc surface.

4. The exhaust bayonet as described in claim 1, characterized in that, The front end of the bayonet body (100) has two symmetrical inclined surfaces (111). The inclined surfaces (111) are inclined forward from the upper end surface of the bayonet body (100) toward the lower end surface. The two inclined surfaces (111) respectively form the blade (110) with the lower end surface of the bayonet body (100). The blade (110) is provided with a first serration (112) along its length direction.

5. A venting bayonet as described in claim 1, characterized in that, The fixed support assembly (300) includes a plurality of protrusions (310), which are arranged in a matrix on the lower end face of the bayonet body (100). The length of the plurality of protrusions (310) arranged along the width direction of the bayonet body (100) is greater than the axial length of the rotating roller (200), and the length of the plurality of protrusions (310) arranged along the length direction of the bayonet body (100) is greater than the diameter of the rotating roller (200).

6. A venting bayonet as described in claim 5, characterized in that, The protrusion (310) is a cone-shaped block, and the cross-sectional area of ​​the cone-shaped block gradually decreases from top to bottom.

7. A venting bayonet as described in claim 1, characterized in that, The elastic spreading assembly (400) includes a second strip-shaped hole (410), a rotating shaft (420), a support block (430), and a return spring (440). The second strip-shaped hole (410) is formed on the bayonet body (100), and the length direction of the second strip-shaped hole (410) is perpendicular to the piercing direction of the bayonet body (100). The rotating shaft (420) is installed in the second strip-shaped hole (410) along the length direction of the second strip-shaped hole (410). The support block (430) is installed on the rotating shaft (420) and protrudes from the upper end face of the bayonet body (100). The return spring (440) is installed on the inner side wall of the second strip-shaped hole (410) away from the blade (110) and is used to provide the support block (430) with a rebound force to rotate toward one end of the blade (110).

8. A venting bayonet as described in claim 7, characterized in that, The upper end face of the support block (430) has a guide slope (431) that slopes upward from front to back, and the rear end face of the support block (430) has a force-bearing slope (432) that slopes forward from top to bottom. The inner side wall of the second strip hole (410) away from the blade (110) has a support slope (411) that slopes forward from top to bottom. The support slope (411) and the force-bearing slope (432) are arranged parallel to each other. The reset spring (440) is connected between the support slope (411) and the force-bearing slope (432).

9. A venting bayonet as described in claim 8, characterized in that, The guide slope (431) and the force-bearing slope (432) form the rear end angle of the support block (430), and the rear end angle is provided with a second serration (433) along the width direction.

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