Bayonet and puncture equipment

Abstract

The utility model discloses a bayonet and puncturing equipment, and belongs to the technical field of batteries. The bayonet comprises a puncture section and a main body section which are connected with each other, the bayonet is provided with an exhaust groove, the exhaust groove is arranged across the puncture section and the main body section, and when the bayonet punctures the air bag, the puncture section can penetrate through at least one layer of aluminum plastic film of the air bag. According to the bayonet, the gas discharge rate can be increased after the bayonet punctures an air bag.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a bayonet and piercing device. Background Technology

[0002] Pouch batteries typically use an aluminum-plastic film to wrap the pre-wound cells for the first encapsulation. During this first encapsulation, an air pocket is left outside the cell. After the first encapsulation is complete, the cell needs to undergo formation. During this formation process, gas is generated inside the cell, and this gas flows into the air pocket. Therefore, before the second encapsulation, the air pocket needs to be punctured with a piercing tool to release the gas.

[0003] In related technologies, the gas emission rate is low after the bayonet punctures the air bag. Utility Model Content

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a bayonet and a piercing device to improve the gas emission rate after the bayonet pierces a gas bag.

[0005] According to a first aspect of this application, a bayonet is used to pierce an air bag formed by aluminum-plastic film encapsulating a battery cell. The bayonet includes a piercing section and a main body section connected to each other. The bayonet has an exhaust groove that spans the piercing section and the main body section. When the bayonet pierces the air bag, the piercing section can penetrate at least one layer of the aluminum-plastic film of the air bag.

[0006] The bayonet according to the embodiments of this application has at least the following beneficial effects:

[0007] When the bayonet pierces the air bag, the piercing section can penetrate at least one layer of aluminum-plastic film in the air bag, so that the gas inside the air bag can escape outward through the exhaust groove located between the piercing section and the main body section even during the process of the bayonet piercing the air bag. This helps to increase the rate of gas outward escape, thereby reducing the impact of the bayonet on the sealing of the piercing hole, which in turn helps to reduce the possibility of the battery cell swelling and improves the safety of the battery cell.

[0008] According to some embodiments of this application, the number of exhaust grooves is at least two, and the at least two exhaust grooves are arranged at intervals along a direction intersecting the piercing direction of the bayonet.

[0009] According to some embodiments of this application, the puncture section includes a puncture body and a puncture fin. The puncture body is connected to the main body section, the puncture fin protrudes from the puncture body, and the exhaust groove spans the puncture body and the main body section. When the puncture body punctures the air bag, the puncture fin can penetrate at least one layer of the aluminum-plastic film of the air bag.

[0010] According to some embodiments of this application, the puncture fin extends along the extension direction of the exhaust groove, and the puncture body and the puncture fin are connected as an integral structure.

[0011] According to some embodiments of this application, the thickness of the puncture fin on the side closer to the puncture body is greater than the thickness of the puncture fin on the side away from the puncture body.

[0012] According to some embodiments of this application, the puncture segment includes a puncture body connected to the main body segment, the puncture body including a blade having a protrusion.

[0013] According to some embodiments of this application, the number of protrusions is multiple, and the multiple protrusions are arranged at intervals along the extension direction of the blade.

[0014] According to some embodiments of this application, the puncture body further includes a blade back, the blade back including blade back teeth, the number of blade back teeth being multiple, and the multiple blade back teeth being spaced apart along the extension direction of the blade back.

[0015] According to some embodiments of this application, the back of the blade also includes a dorsal fin, which protrudes from the back teeth, and the back teeth and the dorsal fin are arranged alternately along the piercing direction of the bayonet.

[0016] The puncture device according to a second aspect embodiment of this application includes:

[0017] Bayonet according to any of the foregoing embodiments;

[0018] The driving device is capable of driving the bayonet to pierce the air bag.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 The image shows three views of a bayonet in one embodiment of this application, with corresponding positions in the three views connected by dashed lines.

[0022] Figure 2 This is a schematic diagram of the structure of a bayonet piercing an air bag in one embodiment of this application.

[0023] Figure label:

[0024] 100. Bayonet; 1. Piercing section; 11. Piercing body; 111. Blade; 1111. Protrusion; 112. Back of blade; 1121. Back of blade teeth; 1122. Back of blade fin; 12. Piercing fin; 2. Main body section; a. Exhaust groove; b. Weight reduction groove; 200. Aluminum-plastic film; 210. Puncture pit; 211. Air bag; 220. Battery cell position. Detailed Implementation

[0025] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0026] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0027] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0029] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] In related technologies, bayonets are typically flat blades designed to create a flat puncture hole at the puncture site on the airbag. During the puncture of the airbag, under negative pressure, the flat, solid bayonet inserted into the puncture hole can easily cause a degree of blockage. This prevents the gas inside the airbag from escaping through the puncture hole in a timely manner, potentially causing the battery cell to swell and altering its structure, which is detrimental to the safety of the battery cell.

[0031] In view of this, this application provides a bayonet 100. Through the exhaust groove a on the bayonet 100 spanning the piercing section 1 and the main body section 2, the gas in the air bag 211 can be released relatively quickly through the exhaust groove a during the process of the bayonet 100 piercing the air bag 211. This is beneficial to improve the gas release rate after the bayonet 100 pierces the air bag 211, reduce the possibility of the battery cell swelling, and improve the safety of the battery cell.

[0032] Figure 2 The general structure of the aluminum-plastic film 200 packaged battery cell is shown, as follows: Figure 2 As shown, the aluminum-plastic film 200 is used to encapsulate the battery cell. The aluminum-plastic film 200 has a cell position 220 within the cell area to cover the cell. Outside the cell area, the aluminum-plastic film 200 has a perforated position 210 connected to the cell position 220 to form a gas bag 211 to accommodate the gas generated by the battery cell during the formation stage. Because the aluminum-plastic film 200 has a certain degree of elasticity, perforations can be pre-made at the perforated position 210 to increase the volume of gas that the gas bag 211 can hold. When the bayonet 100 punctures the gas bag 211, a puncture hole is formed on the gas bag 211, allowing the gas inside the gas bag 211 to escape through the puncture hole.

[0033] Specifically, Figure 1 The diagram shows three views of a bayonet 100 according to one embodiment of this application. The bayonet 100 includes a piercing section 1 and a main body section 2 connected to each other. The bayonet 100 can be made of metal or a material with a certain strength. The piercing section 1 is used to pierce the air bag 211 to form a piercing hole at the piercing position, allowing gas inside the air bag 211 to escape from the piercing hole. The main body section 2 can be used to hold the bayonet 100 so that the piercing section 1 can pierce the air bag 211. It should be noted that during the process of the bayonet 100 piercing the air bag 211, along the piercing direction of the bayonet 100, the part of the bayonet 100 that pierces into the air bag 211 is the piercing section 1, and the part of the bayonet 100 that does not pierce into the air bag 211 is the main body section 2. The bayonet 100 has an exhaust groove a, which spans across the piercing section 1 and the main body section 2. The exhaust groove a can be used as follows: Figure 1The venting groove a can also be provided along the thickness direction of the bayonet 100 without penetrating the bayonet 100. Venting grooves a can also be provided on both opposite sides of the bayonet 100 along its thickness direction without penetrating the bayonet 100. When the bayonet 100 pierces the air bag 211, the piercing section 1 can penetrate at least one layer of aluminum-plastic film 200 of the air bag 211. This allows the gas inside the air bag 211 to escape outwards through the venting groove a spanning the piercing section 1 and the main body section 2, even during the piercing process. This improves the rate of gas escape, reduces the impact of the bayonet 100 on the sealing of the piercing hole, and consequently reduces the possibility of cell bulging, thus improving the safety of the cell.

[0034] For example, the puncture section 1 penetrates a layer of aluminum-plastic film 200 of the air bag 211 along the puncture direction, so that a puncture hole is formed on the aluminum-plastic film 200, and the gas in the air bag 211 escapes outward through the puncture hole and the exhaust groove a on the bayonet 100.

[0035] For example, the puncture section 1 penetrates the two layers of aluminum-plastic film 200 of the air bag 211 along the puncture direction, so that two puncture holes are formed on the aluminum-plastic film 200 at intervals along the puncture direction of the bayonet 100, and the gas in the air bag 211 escapes outward through the two puncture holes and the exhaust groove a on the bayonet 100.

[0036] In one embodiment, please refer to Figure 1 The number of exhaust grooves a is at least two. The at least two exhaust grooves a are arranged at intervals in a direction that intersects with the piercing direction of the bayonet 100, so as to increase the exhaust area of ​​the exhaust grooves a, thereby increasing the flow rate of gas in the air bag 211 outward through the exhaust grooves a, which is beneficial to increasing the rate of gas outward dissipation, thereby reducing the possibility of cell bulging, and thus improving the safety of the cell.

[0037] For example, Figure 1 and Figure 2 The direction shown by R1 is the piercing direction of the bayonet 100. There are two exhaust grooves a, which are arranged at intervals along the vertical direction that intersects the piercing direction of the bayonet 100, so as to increase the exhaust area of ​​the exhaust grooves a.

[0038] In one embodiment, please refer to Figure 1The puncture section 1 includes a puncture body 11 and a puncture fin 12. The puncture body 11 is connected to the main body section 2, and the puncture fin 12 protrudes from the puncture body 11. The included angle between the puncture fin 12 and the puncture body 11 is not limited. The exhaust groove a spans across the puncture body 11 and the main body section 2. When the puncture body 11 punctures the air bag 211 to form a puncture hole, the puncture fin 12 can penetrate at least one layer of aluminum-plastic film 200 of the air bag 211. This allows the puncture fin 12 to enlarge the puncture hole during the process of the bayonet 100 puncturing the air bag 211 to increase the flow rate of gas escaping outward through the puncture hole. Combined with the exhaust groove a to exhaust gas outward, this increases the rate of gas escape, reducing the possibility of cell bulging and thus improving the safety of the cell.

[0039] For example, the piercing fin 12 can be as follows Figure 1 and Figure 2 The structure is trapezoidal, with the piercing fin 12 arranged perpendicularly to the piercing body 11, so that a cross-shaped piercing hole can be formed on the air bag 211 during the piercing process of the piercing body 11. When the piercing body 11 penetrates one layer of aluminum-plastic film 200 of the air bag 211 along the piercing direction, a cross-shaped piercing hole is formed on the aluminum-plastic film 200, and the gas in the air bag 211 escapes outward through the cross-shaped piercing hole and the exhaust groove a on the bayonet 100; when the piercing body 11 penetrates two layers of aluminum-plastic film 200 of the air bag 211 along the piercing direction, two cross-shaped piercing holes are formed on the aluminum-plastic film 200 arranged at intervals along the piercing direction of the bayonet 100, and the gas in the air bag 211 escapes outward through the two cross-shaped piercing holes and the exhaust groove a on the bayonet 100.

[0040] In one embodiment, please refer to Figure 1 The piercing fin 12 extends along the extension direction of the exhaust groove a, that is, the piercing fin 12 protrudes from the piercing body 11 and extends along the piercing direction of the bayonet 100. The dimension of the piercing fin 12 in the piercing direction of the bayonet 100 can be equal to the dimension of the exhaust groove a located in the piercing section 1 in the piercing direction of the bayonet 100. The piercing body 11 and the piercing fin 12 are connected as an integral structure, that is, the piercing body 11 and the piercing fin 12 are integrally formed, so as to reduce the processing steps of the bayonet 100 of this application. For example, the piercing section 1 can be directly stamped at the position of the exhaust groove a located in the piercing section 1, so that the stamped part bends and protrudes from the piercing body 11 to form the piercing fin 12. The empty groove formed at the corresponding position is a partial exhaust groove a, so that a single stamping process can produce a partial exhaust groove a and the piercing fin 12, thereby reducing the processing steps of the bayonet 100.

[0041] It is understood that the puncture body 11 and the puncture fin 12 are not necessarily integrally formed. For example, the puncture body 11 and the puncture fin 12 can also be processed separately and then welded together.

[0042] In one embodiment, the thickness of the puncture fin 12 on the side near the puncture body 11 is greater than the thickness of the side of the puncture fin 12 away from the puncture body 11. This results in a smaller thickness on the side of the puncture fin 12 away from the puncture body 11, making the side of the puncture fin 12 more sharp. This reduces the pressure of the bayonet 100 on the air bag 211 along the puncture direction and reduces the stretching of the aluminum-plastic film 200, allowing the bayonet 100 to more easily puncture the air bag 211 to form a larger puncture hole. For example, the side of the puncture fin 12 away from the puncture body 11 can be ground thinner.

[0043] It is understood that the thickness of the puncture fin 12 on the side closer to the puncture body 11 is not limited to being greater than the thickness of the puncture fin 12 on the side away from the puncture body 11, and the thickness of the puncture fin 12 on the side closer to the puncture body 11 may also be less than or equal to the thickness of the puncture fin 12 on the side away from the puncture body 11.

[0044] In one embodiment, please refer to Figure 1 The puncture section 1 includes a puncture body 11, which is connected to the main body section 2. The puncture body 11 includes a blade 111, which has a protrusion 1111. The protrusion 1111 protrudes from the blade 111 along the puncture direction of the bayonet 100, so that during the process of the bayonet 100 puncturing the air bag 211, the blade 111 with the protrusion 1111 reduces the compression of the bayonet 100 on the air bag 211 along the puncture direction, thereby reducing the stretching of the aluminum-plastic film 200 and making it easier for the bayonet 100 to puncture the air bag 211.

[0045] It is understood that the blade 111 is not limited to having a protrusion 1111. For example, the projection of the blade 111 in a direction intersecting the piercing direction of the bayonet 100 can be a relatively smooth curve.

[0046] In one embodiment, please refer to Figure 1 The blade has multiple protrusions 1111, which are spaced apart along the extension direction of the blade 111. During the bayonet 100's piercing of the air bag 211, the blade 111 with these protrusions further reduces the pressure exerted by the bayonet 100 on the air bag 211 along the piercing direction, thus reducing the stretching of the aluminum-plastic film 200 and making it easier for the bayonet 100 to pierce the air bag 211. The multiple protrusions 1111 also act as a divider on the air bag 211 during the bayonet 100's piercing process, enlarging the piercing hole and improving the gas emission rate within the air bag 211.

[0047] In one embodiment, please refer to Figure 1 The puncture body 11 also includes a blade back 112. Exemplarily, Figure 1 The back of the blade 112 can be arranged at intervals from the blade 111 along the width direction of the bayonet 100. The back of the blade 112 includes multiple back teeth 1121, which are arranged at intervals along the extension direction of the back of the blade 112. This allows the multiple back teeth 1121 arranged at intervals along the extension direction of the back of the blade 112 to cut the air bag 211 during the process of the bayonet 100 piercing the air bag 211, thereby enlarging the piercing hole and improving the gas emission rate inside the air bag 211.

[0048] It is understood that the blade back 112 is not limited to including the blade back teeth 1121. For example, the projection of the blade back 112 in the direction intersecting the piercing direction of the bayonet 100 can be a relatively smooth curve.

[0049] In one embodiment, please refer to Figure 1 The back of the blade 112 also includes a dorsal fin 1122, which protrudes from the back teeth 1121. The back teeth 1121 and the dorsal fin 1122 are arranged alternately along the piercing direction of the bayonet 100, so that when the bayonet 100 pierces the air bag 211 and is pulled out of the air bag 211, the dorsal fin 1122 can hook the air bag 211 and further cut the air bag 211 to further enlarge the piercing hole, which is beneficial to increasing the gas emission rate inside the air bag 211.

[0050] For example, the forming method of the blade back teeth 1121 and the blade back fin 1122 is not limited. The blade back teeth 1121 and the blade back fin 1122 can be integrally formed. At the position of the blade back fin 1122 on the blade back 112, the blade back 112 is directly stamped, so that the stamped part bends and protrudes from the blade back 112 to form the blade back fin 1122. The unstamped part forms the blade back teeth 1121, thereby allowing the blade back teeth 1121 and the blade back fin 1122 to be arranged alternately along the piercing direction of the bayonet 100. The blade back teeth 1121 and the blade back fin 1122 can be produced in one stamping process, which helps to reduce the processing steps of the bayonet 100. The blade back teeth 1121 and the blade back fin 1122 can also be processed separately and then welded together.

[0051] For example, please refer to Figure 2 During the process of the bayonet 100 piercing the air bag 211 along the piercing direction, the piercing section 1 penetrates both layers of aluminum-plastic film 200 of the air bag 211, while the dorsal fin 1122 of the blade only penetrates the upper layer of aluminum-plastic film 200 of the air bag 211.

[0052] It is understandable that the back of the blade 112 is not limited to including the back fin 1122.

[0053] A second aspect of this application provides a piercing device, including a bayonet 100 and a driving device. The driving device is used to drive the bayonet 100 to pierce an air bag 211 and to drive the bayonet 100 to be pulled out of the pierced air bag 211. It is understood that the bayonet 100 of this application can be machined from a flat, solid bayonet 100 in the related art. This allows the piercing device of this application to drive the bayonet 100 to pierce the air bag 211 and to be pulled out of the pierced air bag 211 without changing the driving device, facilitating operation and reducing the production cost of the battery cell during processing.

[0054] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A bayonet for piercing an air pocket formed by an aluminum-plastic film-encapsulated battery cell, characterized in that, It includes an interconnected puncture section and a main body section. The bayonet has an exhaust groove that spans the puncture section and the main body section. When the bayonet punctures the air bag, the puncture section can penetrate at least one layer of the aluminum-plastic film of the air bag.

2. The bayonet according to claim 1, characterized in that, The number of exhaust channels is at least two, and the at least two exhaust channels are arranged at intervals along a direction that intersects the piercing direction of the bayonet.

3. The bayonet according to claim 1, characterized in that, The puncture section includes a puncture body and a puncture fin. The puncture body is connected to the main body section, and the puncture fin protrudes from the puncture body. The exhaust groove spans the puncture body and the main body section. When the puncture body punctures the air bag, the puncture fin can penetrate at least one layer of the aluminum-plastic film of the air bag.

4. The bayonet according to claim 3, characterized in that, The puncture fin extends along the extension direction of the exhaust groove, and the puncture body and the puncture fin are connected as an integral structure.

5. The bayonet according to claim 3, characterized in that, The thickness of the puncture fin on the side closer to the puncture body is greater than the thickness of the puncture fin on the side away from the puncture body.

6. The bayonet according to claim 1, characterized in that, The puncture segment includes a puncture body connected to the main body segment. The puncture body includes a blade with a protrusion.

7. The bayonet according to claim 6, characterized in that, The number of protrusions is multiple, and the multiple protrusions are arranged at intervals along the extension direction of the blade.

8. The bayonet according to claim 6, characterized in that, The puncture body also includes a blade back, which includes blade back teeth. The number of blade back teeth is multiple, and the multiple blade back teeth are arranged at intervals along the extension direction of the blade back.

9. The bayonet according to claim 8, characterized in that, The back of the blade also includes a dorsal fin, which protrudes from the blade teeth, and the blade teeth and the dorsal fin are arranged alternately along the piercing direction of the bayonet.

10. A puncture device, characterized in that, include: Bayonet according to any one of claims 1 to 9; The driving device is capable of driving the bayonet to pierce the air bag.

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