Bayonet structure

Abstract

The utility model belongs to the technical field of batteries, and mainly relates to a bayonet structure which comprises a bayonet and a flaring blade hinged with the bayonet through a connecting part, one end of the bayonet along the length direction is used for puncturing the air bag; the flaring blade is provided with a connecting part hinged to the bayonet, and the connecting part is provided with a first blade and a second blade in an extending mode. An obtuse angle is formed between the first blade and the second blade; according to the technical scheme, the bayonet structure is improved, the problem that gas dissipation is blocked is effectively solved, and the gas emission efficiency is remarkably improved; and in the secondary sealing air exhaust stage, the design of the flaring blade can reduce the retention of residual gas in the air bag, so that the battery cell bulging phenomenon caused by the fact that the gas cannot be exhausted in time is avoided, and the safety and the stability of the battery cell are fundamentally improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field, concretely relates to a bayonet structure. BACKGROUND

[0002] In the preparation process of lithium battery, the second sealing and air extraction stage is one of the key links in battery production, and the purpose is to realize the vacuum sealing of the battery cell by extracting the gas in the gas bag, so as to improve the reliability and safety of the battery cell. In this stage, it is usually necessary to use a bayonet to pierce the gas bag to make the gas escape through the pierced hole.

[0003] However, the bayonet widely used in the prior art is usually flat, and the piercing hole formed after piercing the gas bag is only a narrow slit. This narrow slit type piercing hole has significant technical defects: on the one hand, the narrow slit hinders the escape of gas, resulting in that the gas in the gas bag cannot be quickly and fully discharged; on the other hand, in the subsequent vacuum stage, due to the gas remaining in the gas bag, a high internal pressure is easily formed, thereby causing the battery cell to swell under negative pressure. This swelling not only may cause the structure of the battery cell to change, but also seriously affects the performance and safety of the battery, and there is a great hidden danger.

[0004] Therefore, it is urgent to improve the existing bayonet structure to solve the above technical defects. UTILITY MODEL CONTENTS

[0005] The utility model aims at: in view of the deficiency of prior art, provide a bayonet structure that can effectively solve the problem of gas escape obstruction in the second sealing and air extraction stage of battery.

[0006] In order to realize the above technical purpose, the following technical scheme is implemented in the application:

[0007] A bayonet structure, comprising a bayonet and an expanded blade hinged to the bayonet through a connecting part;

[0008] One end of the bayonet along the length direction is used for piercing the gas bag; the expanded blade is provided with a connecting part hinged to the bayonet, and the connecting part is provided with a first blade and a second blade; the first blade and the second blade are at an obtuse angle.

[0009] The above technical scheme has the following technical effects:

[0010] The bayonet is provided with flared blades on the side, which can form a larger opening after piercing the gas bag; the first blade and the second blade of the flared blade form an obtuse angle, so as to further expand the size of the hole when piercing the gas bag. Compared with the traditional flat bayonet structure, the design effectively solves the problem of gas emission obstruction, significantly improves the efficiency of gas emission. In the two-seal gas extraction stage, this improvement can reduce the retention of residual gas in the gas bag, avoid the phenomenon of battery swelling caused by the failure of the gas to be discharged in time, and fundamentally improve the safety and stability of the battery.

[0011] As a further improvement of the utility model discloses a bayonet structure, the bayonet is provided with a body and the bayonet needle fixedly connected with the body;

[0012] The bayonet needle is used to pierce the gas bag.

[0013] As a further improvement of the utility model discloses a bayonet structure, the flared blade is hinged with the body through the connecting part;

[0014] The first blade is tightly attached to the body before the bayonet needle pierces the gas bag.

[0015] As a further improvement of the utility model discloses a bayonet structure, the body is provided with a first magnet, and the second blade is provided with a second magnet corresponding to the first magnet, and the first magnet and the second magnet are opposite in polarity.

[0016] As a further improvement of the utility model discloses a bayonet structure, the second magnet is arranged on the side of the second blade close to the body, and the first magnet is arranged on the side of the body close to the second blade.

[0017] As a further improvement of the utility model discloses a bayonet structure, the flared blade is provided with two, and each flared blade is symmetrically arranged along the length direction of the bayonet.

[0018] As a further improvement of the utility model discloses a bayonet structure, the included angle α between the first blade and the second blade ranges from 95° to 175°.

[0019] As a further improvement of the utility model discloses a bayonet structure, the first blade is provided with an extension body and a blade tip fixedly connected to the farthest end of the extension body away from the connecting part.

[0020] As a further improvement of the utility model discloses a bayonet structure, the length of the first blade is less than the length of the connecting part away from the bayonet needle.

[0021] As a further improvement of the utility model discloses a bayonet structure, the length of the second blade is less than the distance from the connecting part to the end of the body away from the bayonet needle. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are included to provide a further understanding of the present application and constitute a part of this application, illustrate embodiments of the present application and together with the general description of the application given above and the detailed description of the embodiments given below, serve to explain the present application. In the drawings:

[0023] Figure 1 Structure schematic view of embodiment 1 in the present application;

[0024] Figure 2 Working step view of embodiment 2 in the present application;

[0025] Figure 3 Structure schematic view of embodiment 3 in the present application;

[0026] Among them:

[0027] 1 - bayonet;

[0028] 11 - body;

[0029] 111 - first magnet;

[0030] 12 - lancet;

[0031] 2 - flared blade;

[0032] 21 - connecting part;

[0033] 22 - first blade;

[0034] 221 - extension body;

[0035] 222 - blade tip;

[0036] 23 - second blade;

[0037] 231 - second magnet 231. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. Unless otherwise defined, all the technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application.

[0039] In the description of the utility model, unless another explicit provision and limitation, the term "installation" "connection" "connect" "fix" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two elements of the interaction relationship.For ordinary skilled in the art, the above terms can be understood in the utility model with the specific meaning of the specific circumstances.

[0040] Although the above-mentioned preferred embodiments are disclosed in the present application, the present application is not intended to limit the claims, and any person skilled in the art can make several possible changes and modifications without departing from the concept of the present application, therefore the protection scope of the present application should be limited by the scope defined by the claims of the present application.

[0041] The utility model will be described in further detail in combination with specific embodiments, but the embodiments of the utility model are not limited to this.

[0042] Embodiment 1

[0043] As Figure 1 shown, in order to solve the technical defects of bayonet 1 used in the second sealing and air extraction stage of the preparation of the existing lithium battery, the existing bayonet 1 structure is improved in the present application, specifically, the bayonet 1 structure of the present application includes bayonet 1 and flared blade 2 hinged with bayonet 1 through connecting part 21;The one end of bayonet 1 along the length direction (specifically Y-axis direction) is used to pierce the gas bag;The flared blade 2 is provided with connecting part 21 hinged with bayonet 1, and the first blade 22 and the second blade 23 are extendedly arranged on connecting part 21;The first blade 22 and the second blade 23 form an obtuse angle. Figure 1

[0044] Further, the core of the improvement of the prior art in the present application is the setting of the flared blade 2, since the flared blade 2 is arranged on one side of the bayonet 1, the flared blade 2 can effectively enlarge the size of the puncture hole after the bayonet 1 pierces the gas bag. This design not only makes the gas escape from the gas bag more quickly, but also reduces the retention of residual gas in the gas bag during the second sealing and air extraction stage, thereby avoiding the phenomenon of cell bulging caused by the failure of the gas to be discharged in time. In addition, the obtuse angle design of the flared blade 2 ensures that a larger opening can be formed when the gas bag is pierced, further improving the efficiency of gas discharge. In this way, the safety and stability of the cell are significantly improved, effectively solving the problems existing in the prior art.

[0045] ​Specifically, the flared blade 2 includes a first blade 22 and a second blade 23 at an obtuse angle with the first blade 22, the first blade 22 is used to assist the bayonet 1 to pierce the air bag. At the same time, since the first blade 22 and the second blade 23 are both extended from the connecting part 21, when the first blade 22 assists the bayonet 1 to pierce the air bag, the second blade 23 is pushed by the air bag with a small opening pierced to drive the first blade 22 to move axially along the connecting part 21, thereby making the opening after piercing larger, thereby ensuring the smoothness of gas discharge. In addition, the obtuse angle design between the first blade 22 and the second blade 23 can form a larger opening when piercing the air bag, which helps the rapid discharge of gas. This design not only improves the efficiency of gas discharge, but also reduces the retention of residual gas in the air bag during the two-seal gas extraction stage, effectively avoiding the occurrence of cell bulging, thereby improving the safety and stability of the cell.

[0046] Embodiment 2

[0047] As shown in Figures 1-2 different from embodiment 1: in order to further improve the piercing effect of the bayonet 1 structure of the present application on the air bag impact crater, further, the bayonet 1 is provided with a body 11 and a needle 12 fixedly connected with the body 11; the needle 12 is used to pierce the air bag. Among them, the tip of the needle 12 is designed to be sharp, which can accurately pierce the air bag and reduce the damage to the air bag material. At the same time, the length and shape of the needle 12 are optimized to ensure that the size of the puncture hole can be effectively controlled while piercing the air bag, avoiding the problem of too large hole leading to too fast gas discharge, affecting the stability and safety of the gas extraction process.

[0048] In addition, the fixed connection mode of the needle 12 and the body 11 ensures the stability and durability of the needle 12 during use, reducing the production cost and time loss caused by frequent replacement or maintenance of the needle 12. Through this design, the efficiency and safety of the two-seal gas extraction stage in the battery production process can be further improved, ensuring the quality and performance of the battery.

[0049] Further, the flared blade 2 is hinged to the body 11 through the connecting part 21; the first blade 22 is tightly attached to the body 11 before the needle 12 pierces the air bag. Thus according to Figure 2As shown in the structure workflow diagram of the bayonet 1, the bayonet 1 structure gradually unfolds from the first blade 22 closely attached to the body 11. When the bayonet 1 and the first blade 22 are deeply inserted into the air bag pit to a certain extent, the second blade 23 gradually contacts the opening of the air bag, causing the second blade 23 to gradually approach the body 11 under force, thereby the first blade 22 drives the air bag opening to gradually unfold. When the bayonet 1 and the first blade 22 are deeply inserted into the air bag pit to a certain extent, the second blade 23 gradually contacts the opening of the air bag, causing the second blade 23 to gradually approach the body 11 under force, thereby the first blade 22 drives the air bag to approach, making the opening after piercing become larger, thereby ensuring the smoothness of gas discharge. In addition, the obtuse angle design between the first blade 22 and the second blade 23 can form a larger opening when piercing the air bag, which helps the gas to be discharged quickly. This design not only improves the efficiency of gas discharge, but also reduces the retention of residual gas in the air bag during the two-seal gas extraction stage, effectively avoiding the occurrence of cell bulging, thereby improving the safety and stability of the cell.

[0050] Further, the included angle α between the first blade 22 and the second blade 23 ranges from 95° to 175°. In a specific implementation process, the included angle α can be preferably any one of 95°, 97°, 100°, 103°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, 155°, 160°, 165°, 170°, and 175°. The technical solution of the present application can further optimize the performance of the bayonet 1 structure by controlling the size of the included angle α, to ensure that the best gas discharge effect is achieved under different working conditions.

[0051] In addition, the optimization design of the included angle α also considers the strength and durability of the material to ensure the stability and reliability of the bayonet 1 structure in long-term use. In actual application, according to the material and thickness of the air bag and the use environment of the bayonet 1, the value of the included angle α can be adjusted to adapt to different use requirements.

[0052] Further, the first blade 22 is provided with an extension body 221 and a blade tip 222 fixedly connected at the farthest end of the extension body 221 away from the connecting part 21. By this design, the extension body 221 of the first blade 22 not only increases the length of the blade, but also provides a larger contact area, so that the size and shape of the opening when piercing the air bag can be more effectively controlled. The setting of the blade tip 222 further enhances the accuracy and force of piercing the air bag, ensuring the efficiency and stability of the piercing process. Through this design, the damage to the air bag material during piercing can be reduced, while the appropriate size of the gas discharge hole is ensured, avoiding the problems of too fast or too slow gas discharge.

[0053] Specifically, the length of the first blade 22 is less than the length of the connecting part 21 from the lance 12. In this way, it is ensured that during the process of piercing the gas bag, the first blade 22 will not extend too long into the interior of the gas bag, thereby avoiding unnecessary damage to the internal structure of the gas bag. At the same time, this design allows the first blade 22 to quickly separate from the surface of the gas bag after piercing the gas bag, reducing the friction between the blade and the gas bag material, and prolonging the service life of the blade.

[0054] In addition, due to the moderate length of the first blade 22, it can effectively control the size of the puncture hole when piercing the gas bag, ensuring that the gas can be smoothly discharged, while avoiding the problem of too fast gas discharge due to a too large hole, affecting the stability and safety of the gas extraction process. Through the control of the length, the efficiency and safety of the second sealing gas extraction stage in the battery production process can be further improved, ensuring the quality and performance of the battery.

[0055] Further, the length of the second blade 23 is less than the distance from the connecting part 21 to the end of the body 11 away from the lance 12. In this way, it is ensured that during the process of piercing the gas bag, the second blade 23 can effectively assist the first blade 22 to enlarge the puncture hole, while avoiding the damage to the internal structure of the gas bag caused by the excessive length of the blade. In addition, the moderate length of the second blade 23 allows the blade to quickly separate from the surface of the gas bag after piercing the gas bag, reducing the friction between the blade and the gas bag material, and prolonging the service life of the blade.

[0056] Other than the same as embodiment 1, this embodiment will not be described again.

[0057] Embodiment 3

[0058] As shown in Figures 1-3 Unlike embodiment 1, this application is further to solve the problem of surface tension caused by the electrolyte attached to the second blade 23 surface due to the gas bag impact pit in the actual use process. Due to the existence of electrolyte, the surface tension wave caused by the electrolyte cannot make the first blade 22 and the second blade 23 reset in the process of pulling out the gas bag impact pit as shown in Figure 2 Therefore, the body 11 is provided with a first magnet 111, and the second blade 23 is provided with a second magnet 231 corresponding to the first magnet 111, and the polarity of the first magnet 111 and the second magnet 231 is opposite.

[0059] Therefore, even if the electrolyte adheres between the second blades 23 and generates surface tension, so that the second blades 23 cannot directly move away from the body 11, the first magnet 111 and the second magnet 231 can be attracted to each other by magnetic force, thereby overcoming the surface force, so that the first blade 22 can be smoothly reset with the second blade 23. The design of this magnetic force assisted reset not only improves the use efficiency of the bayonet 1 structure, but also ensures the stability and reliability under complex working conditions. In this way, the blade jamming problem caused by electrolyte adhesion can be effectively avoided, and the smoothness and efficiency of the bayonet 1 structure in continuous use can be ensured.

[0060] Further, the second magnet 231 is arranged on the side of the second blade 23 close to the body 11, and the first magnet 111 is arranged on the side of the body 11 close to the second blade 23. Therefore, the magnetic force between the first magnet 111 and the second magnet 231 can ensure that the first blade 22 can quickly separate and reset from the second blade 23 after the blade is pulled out of the air bag, thereby avoiding the blade jamming problem caused by electrolyte.

[0061] Further, in the specific implementation process, the flared blade 2 is arranged as two, and each flared blade 2 is symmetrically arranged along the length direction of the bayonet 1 (in the Y-axis direction in the specific embodiment). Figure 1 Therefore, this symmetrical arrangement not only enhances the balance and stability of the bayonet 1 structure, but also can more evenly apply force when piercing the air bag, ensuring that the shape of the puncture hole is regular, which helps the uniform discharge of gas. The symmetrical flared blade 2 design can also reduce the deflection of the bayonet 1 when piercing the air bag, improve the accuracy and safety of the operation. In addition, this design makes the force on the bayonet 1 structure more uniform in different directions, prolongs the service life of the bayonet 1, and reduces the maintenance cost.

[0062] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A bayonet structure, characterized in that The bayonet (1) and the flared blade (2) are connected by a connecting part (21); One end of the bayonet (1) is used to pierce the air bag along the length direction; The flared blade (2) is provided with a connecting part (21) connected with the bayonet (1), and the connecting part (21) is provided with a first blade (22) and a second blade (23); The first blade (22) and the second blade (23) form an obtuse angle.

2. A bayonet structure according to claim 1, wherein The bayonet (1) is provided with a body (11) and a piercing needle (12) fixedly connected with the body (11); The piercing needle (12) is used to pierce the air bag.

3. A bayonet structure according to claim 2, wherein The flared blade (2) is connected with the body (11) through the connecting part (21). The first blade (22) is tightly attached to the body (11) before the piercing needle (12) pierces the air bag.

4. The bayonet structure of claim 2, wherein The body (11) is provided with a first magnet (111), and the second blade (23) is provided with a second magnet (231) corresponding to the first magnet (111), and the first magnet (111) and the second magnet (231) are opposite in polarity.

5. A bayonet structure according to claim 4, wherein The second magnet (231) is arranged on one side of the second blade (23) close to the body (11), and the first magnet (111) is arranged on one side of the body (11) close to the second blade (23).

6. A bayonet structure according to any one of claims 1 to 5, wherein The flared blade (2) is provided with two, and each flared blade (2) is symmetrically arranged along the length direction of the bayonet (1).

7. The bayonet structure of claim 1, wherein The included angle α between the first blade (22) and the second blade (23) ranges from 95° to 175°.

8. The bayonet structure of claim 1, wherein The first blade (22) is provided with an extension body (221) and a blade tip (222) fixedly connected with the farthest end of the extension body (221) away from the connecting part (21).

9. The bayonet structure of claim 2, wherein The length of the first blade (22) is less than the length of the connecting part (21) away from the piercing needle (12).

10. The bayonet structure of claim 2, wherein The length of the second blade (23) is less than the distance from the connecting part (21) to the end of the body (11) away from the piercing needle (12).

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