Glue nail and battery formation process
By designing glue nails with fluid channels and using elastic layers to maintain sealing, the problems of battery cells absorb water and electrolyte contamination during liquid injection and decomposition of traditional lithium-ion batteries are solved, and the use of nail extraction machines is reduced, reducing costs and improving injection is achieved. The effect of liquid hole welding yield.
Patent Information
- Application Number
- CN202411592351.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-02-18
AI Technical Summary
Traditional lithium-ion batteries need to be removed during the injection and decomposition process, which causes the battery cell to absorb water, affect product performance, and adds environmental and sequence requirements, so that the electrolyte is prone to flow out of the contaminated injection holes.
A glue nail with a fluid channel is designed. The glue nail body has a first end and a second end, the first end is used to insert the liquid injection hole on the battery, and an elastic layer is connected to the end surface of the second end, and the needle can be inserted into the elastic layer. In communication with the fluid channel, the elastic layer has deformation capability and can remain sealed when the needle is inserted and pulled out.
The glue nail does not require nail extraction, which reduces the use of nail extraction machine, reduces the cost, and does not require the order time, avoids the problem of water absorption of the battery cell and electrolyte contamination of the liquid injection hole, and improves the laser of the subsequent liquid injection hole Welding yield.
Smart Images
Figure CN119481626A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a glue nail and a battery formation process. Background Art
[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. At the same time, people have increasing requirements for the performance and safety of lithium-ion batteries. At present, when traditional single cells are injected (the first injection and the second injection after battery formation), the injection hole is generally sealed by inserting glue nails, and the glue nails need to be pulled out during formation, resulting in about 30 minutes before and after formation when the injection hole is not sealed with glue nails, causing the battery core to absorb water, affecting product performance. Summary of the invention
[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a glue nail and a battery formation process.
[0004] In the first aspect, an embodiment of the present application provides a glue nail, including a glue nail body, in which a fluid channel is provided, the glue nail body has a first end and a second end, the first end is used to be inserted into the injection hole on the battery, a port connected to the fluid channel is formed on the first end, the end surface of the second end is connected to a first elastic layer, a needle can be inserted into the first elastic layer to connect with the fluid channel, the first elastic layer has deformation ability, and when the needle is separated from the first elastic layer, the first elastic layer becomes a sealing layer.
[0005] According to an embodiment of the first aspect of the present application, a positioning recess is formed on a portion of the outer peripheral surface of the adhesive nail body between the first end and the second end.
[0006] According to an embodiment of the first aspect of the present application, at least two positioning recesses are provided, and at least two positioning recesses are spaced apart and distributed along the length direction of the glue nail body.
[0007] According to an embodiment of the first aspect of the present application, at least one second elastic layer is provided on the portion of the glue nail body located between the first end and the second end, the needle can be inserted into the first elastic layer and at least one second elastic layer in sequence to communicate with the fluid channel, the second elastic layer has deformation ability, and when the needle is separated from the two elastic layers, the second elastic layer becomes a sealing layer.
[0008] According to an embodiment of the first aspect of the present application, a conical nail head is formed at the first end, the conical nail head is a hollow structure, the rubber nail body between the conical nail head and the second elastic layer close to the conical nail head is a first cavity structure, and the first cavity structure is connected with the hollow structure to form the fluid channel;
[0009] The glue nail body between two adjacent second elastic layers is a second cavity structure, and the glue nail body between the first elastic layer and the second elastic layer close to the first elastic layer is a third cavity structure.
[0010] According to an embodiment of the first aspect of the present application, the thickness of the first elastic layer is 1.5 mm-2.5 mm;
[0011] And / or, the thickness of the second elastic layer is 1.5 mm-2.5 mm.
[0012] According to an embodiment of the first aspect of the present application, a first notch and a second notch are provided on the first elastic layer, and the first notch and the second notch intersect in a cross shape.
[0013] According to an embodiment of the first aspect of the present application, the length from the end surface of the first end to the end surface of the second end is H, which is 13 mm ≤ H ≤ 16 mm.
[0014] In a second aspect, the present application embodiment provides a battery formation process, including:
[0015] S1, injecting liquid into the battery for the first time through the liquid injection hole of the battery, and then inserting the first end of the glue nail into the liquid injection hole;
[0016] S2, battery infiltration and formation. During formation, the exhaust needle is inserted into the first elastic layer and connected with the fluid channel to extract the gas in the battery.
[0017] According to an embodiment of the second aspect of the present application, the battery is injected with liquid for the second time: the injection needle is inserted into the first elastic layer and communicated with the fluid channel to inject liquid into the battery.
[0018] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:
[0019] The glue nail and battery formation process provided in the embodiment of the present application are suitable for the formation process of lithium batteries and other batteries. After the glue nail is inserted into the injection hole of the battery, the needle is inserted into the first elastic layer and communicated with the inner cavity of the battery through the fluid channel. The negative pressure needle extracts the gas in the battery through the glue nail, and the injection needle injects liquid into the battery cell through the glue nail. In the related art, the glue nail only plays a sealing role. The glue nail needs to be pulled out during the first injection before the formation, and the glue nail needs to be inserted again during the second injection after the formation. Pulling out the nails before and after the formation is easy to cause the battery cell to absorb water, which has high requirements for the environment and the sequence change. The electrolyte is also easy to flow out and pollute the injection hole. The glue nail provided in the embodiment of the present application does not need to be pulled out, which can reduce the use of the nail pulling machine, reduce costs, and has no requirements for the sequence change time. Especially for battery cells such as blade batteries, there is no need to pull out the glue nails during the formation and the second injection, the electrolyte will not pollute the injection hole, and the subsequent injection hole laser welding yield is high. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.
[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the rubber nail described in the embodiment of the present application;
[0023] Figure 2 This is a bottom view of the rubber nail described in the embodiment of the present application;
[0024] Figure 3 for Figure 2 DD section view.
[0025] Among them, 1. fluid channel; 2. first end; 4. first elastic layer; 5. positioning recess; 6. second elastic layer; 7. first notch; 8. second notch. DETAILED DESCRIPTION
[0026] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.
[0028] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields. At the same time, people have increasing requirements for the performance and safety of lithium-ion batteries. At present, when traditional single cells are injected (the first injection and the second injection after battery formation), the injection hole is generally sealed by inserting glue nails, and the glue nails need to be pulled out during formation, resulting in about 30 minutes before and after formation when the injection hole is not sealed with glue nails, causing the battery core to absorb water, affecting product performance.
[0029] In view of this, if Figures 1 to 3As shown, the embodiment of the present application provides a glue nail, including a glue nail body, a fluid channel 1 is provided in the glue nail body, the glue nail body has a first end 2 and a second end, the glue nail body is provided with a fluid channel 1, a port connected to the fluid channel 1 is formed on the first end 2, the first end 2 is used to insert into the injection hole on the battery, and the end surface of the second end is connected to the first elastic layer 4, the needle can be inserted into the first elastic layer 4 to communicate with the fluid channel 1, when the first end 2 is inserted into the injection hole, the needle is inserted into the first elastic layer 4 and communicates with the battery cavity through the fluid channel 1, the needle can be an injection needle, the injection needle injects liquid into the battery cell through the glue nail; the needle can also be a negative pressure needle, the negative pressure needle extracts the gas in the battery through the glue nail. The first elastic layer 4 has the ability to deform, and when the needle is separated from the first elastic layer 4, the first elastic layer 4 elastically recovers to a sealing layer to prevent gas or liquid outside the battery from entering the battery through the needle hole and the glue nail.
[0030] The glue nail provided in the embodiment of the present application is suitable for the formation process of lithium batteries and other batteries. After the glue nail is inserted into the injection hole of the battery, the needle is inserted into the first elastic layer 4 and communicated with the inner cavity of the battery through the fluid channel 1. The negative pressure needle extracts the gas in the battery through the glue nail, and the injection needle injects the battery cell through the glue nail. In the related art, the glue nail only plays a sealing role. The glue nail needs to be pulled out during the first injection before the formation, and the glue nail needs to be inserted again during the second injection after the formation. Pulling the nail before and after the formation is easy to cause the battery cell to absorb water, which has high requirements for the environment and the sequence change. The electrolyte is also easy to flow out and pollute the injection hole. The glue nail provided in the embodiment of the present application does not need to be pulled out, which can reduce the use of the nail pulling machine, reduce costs, and has no requirements for the sequence change time. Especially for batteries such as blade batteries, there is no need to pull out the glue nail during the formation and the second injection, the electrolyte will not pollute the injection hole, and the subsequent injection hole laser welding yield is high.
[0031] In some embodiments, the thickness of the first elastic layer 4 is 1.5 mm-2.5 mm, which can be 1.5 mm, 1.8 mm, 2 mm, 2.3 mm or 2.5 mm, so as to realize the first elastic layer 4 can deform and recover the seal, and avoid the difficulty of needle insertion caused by the first elastic layer 4 being too thick.
[0032] In some embodiments, a positioning recess 5 is formed on the outer peripheral surface of a portion of the plastic nail body between the first end 2 and the second end. The positioning recess 5 facilitates the positioning and clamping of the plastic nail by the nail pulling machine.
[0033] In some embodiments, at least two positioning recesses 5 are provided, and at least two positioning recesses 5 are spaced apart along the length direction of the nail body. The length of the nail body is 13mm-16mm, and there are multiple positioning recesses 5, which facilitates the positioning and clamping of the nail by the nail puller, so that the nail puller can selectively clamp a certain positioning recess 5 according to the relative posture of the battery and the nail. This prevents the nail puller from being unable to clamp the nail due to space limitations and other factors, thereby improving work efficiency and reducing operational difficulty.
[0034] In some embodiments, at least one second elastic layer 6 is provided on the part of the nail body between the first end 2 and the second end, and the needle can be inserted into the first elastic layer 4 and the second elastic layer 6 in sequence to communicate with the fluid channel 1. The second elastic layer 6 has deformation ability. When the needle is separated from the second elastic layer, the second elastic layer 6 is a sealing layer. The first elastic layer 4 and at least one second elastic layer 6 together play a multi-layer sealing role to prevent the electrolyte from flowing out of the nail due to aging or damage of a certain elastic layer.
[0035] In some embodiments, a conical nail head is formed at the first end 2, and the conical nail head is a hollow structure. The nail body between the conical nail head and the second elastic layer 6 near the conical nail head is a first cavity structure, and the first cavity structure is connected to the hollow structure. The nail body between two adjacent second elastic layers 6 is a second cavity structure, and the nail body between the first elastic layer 4 and the second elastic layer 6 near the first elastic layer 4 is a third cavity structure. In other words, the cross-sectional area of the fluid channel 1 is as large as possible. On the premise that the thickness of the nail body is ensured so that the nail body is not easily damaged, the first cavity structure allows the electrolyte flowing with the needle to flow back into the nail body as much and as quickly as possible because the air pressure inside the nail is much lower than the external air pressure. In this way, the second cavity structure and the third cavity structure provide a buffer zone for the electrolyte brought out by the needle. The electrolyte brought out by the needle falls into the second cavity structure and the third cavity structure, avoiding the electrolyte flowing out of the nail and causing pollution and damage to the battery. The larger the space of the second cavity structure and the third cavity structure, the better, providing a larger capacity space for the buffer zone of the electrolyte.
[0036] In some embodiments, the thickness of the first elastic layer 4 is 1.5 mm to 2.5 mm, and may be 1.5 mm, 1.8 mm, 2 mm, 2.3 mm or 2.5 mm. The thickness of the second elastic layer 6 is 1.5 mm to 2.5 mm, and may be 1.5 mm, 1.8 mm, 2 mm, 2.3 mm or 2.5 mm. This can achieve deformation recovery sealing of the first elastic layer 4 and the second elastic layer 6, and avoid the difficulty of needle insertion caused by the first elastic layer 4 and the second elastic layer 6 being too thick.
[0037] In some embodiments, the first elastic layer 4 is provided with a first notch 7 and a second notch 8, which intersect in a cross shape, which is convenient for the needle to locate the insertion position of the first elastic layer 4 and makes it easier for the needle to be inserted into the first elastic layer 4. Of course, the second elastic layer 6 may also be provided with a third notch and a fourth notch, which intersect in a cross shape, making it easier for the needle to be inserted into the second elastic layer 6.
[0038] Considering that the electrolyte in the battery may be easily brought out during the insertion and removal of the needle, in some embodiments, the length from the end face of the first end 2 to the end face of the second end is H, H is 13mm-16mm, H can be 13mm, 14mm, 15mm or 16mm, and when the length of the fluid channel 1 is between 13mm-16mm, the fluid channel 1 in the rubber nail body is longer, and the buffer length in the fluid channel 1 during the insertion and removal of the needle allows the electrolyte carried by the needle and the electrolyte retained between the injection hole and the first elastic layer 4 to remain in the rubber nail or flow back into the battery. At the same time, for batteries such as blade batteries, the injection hole is set on one side of the battery. When the rubber nail is inserted into the injection hole, when the distance between the rubber nail and the surface of one side of the battery is far, even if the electrolyte is brought out with the needle, it will not fall on the surface of the battery.
[0039] Another embodiment of the present application provides a battery formation process, comprising:
[0040] S1, injecting liquid into the battery for the first time through the liquid injection hole of the battery, and then inserting the first end 2 of the glue nail into the liquid injection hole;
[0041] S2, battery infiltration and formation. During formation, the exhaust negative pressure needle is inserted into the first elastic layer 4 and communicated with the fluid channel 1 to extract the gas in the battery.
[0042] In the battery formation process provided by the embodiment of the present application, after the glue nail is inserted into the injection hole of the battery, the needle is inserted into the first elastic layer 4 and communicates with the inner cavity of the battery through the fluid channel 1, and the negative pressure needle extracts the gas in the battery through the glue nail to achieve the exhaust of the battery cell. This avoids the injection hole from leaking after the nail is pulled out, the battery cell absorbs water, reduces the use of the nail pulling machine, reduces the cost, and has no requirement for the sequence transfer time.
[0043] In some embodiments, the battery is injected for the second time: the injection needle is inserted into the first elastic layer 4 and connected to the fluid channel 1 to inject the battery. The injection needle injects liquid into the battery cell through the glue nail. In the related art, the glue nail only plays a sealing role. The glue nail needs to be pulled out during the injection before formation, and the glue nail needs to be inserted again during the second injection after formation. Pulling out the nails before and after formation can easily cause the battery cell to absorb water, which has high requirements for the environment and sequence change. The electrolyte is also easy to flow out and pollute the injection hole. The battery formation process provided in the embodiment of the present application does not require nail pulling, which can reduce the use of nail pulling machines, reduce costs, and has no requirements for sequence change time. Especially for battery cells such as blade batteries, there is no need to pull out the glue nails during formation and secondary injection, the electrolyte will not contaminate the injection hole, and the subsequent injection hole laser welding yield is high.
[0044] In some embodiments, the needle is inserted into the first elastic layer 4 and at least one second elastic layer 6 in sequence and then communicated with the fluid channel 1. The first elastic layer 4 and at least one second elastic layer 6 together play a multi-layer sealing role to prevent the electrolyte from flowing out of the rubber nail due to aging or damage of a certain elastic layer. The second cavity structure and the third cavity structure provide a buffer zone for the electrolyte brought out by the needle. The electrolyte brought out by the needle falls into the second cavity structure and the third cavity structure, preventing the electrolyte from flowing out of the rubber nail and causing pollution and damage to the battery.
[0045] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0046] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A plastic nail, characterized in that: The invention comprises a glue nail body, wherein a fluid channel (1) is arranged in the glue nail body, and the glue nail body has a first end (2) and a second end (3), wherein the first end (2) is used to be inserted into a liquid injection hole on a battery, and a port connected to the fluid channel (1) is formed on the first end (2), and the end surface of the second end is connected to a first elastic layer (4), and a needle can be inserted into the first elastic layer (4) to be connected to the fluid channel (1), and the first elastic layer (4) has a deformation ability, and when the needle is separated from the first elastic layer (4), the first elastic layer (4) becomes a sealing layer.
2. The plastic nail according to claim 1, characterized in that: A positioning recess (5) is formed on the outer peripheral surface of the portion of the adhesive nail body located between the first end (2) and the second end.
3. The plastic nail according to claim 2, characterized in that: At least two positioning recesses (5) are provided, and at least two positioning recesses (5) are spaced apart and distributed along the length direction of the glue nail body.
4. The plastic nail according to claim 1, characterized in that: At least one second elastic layer (6) is provided on the portion of the nail body between the first end (2) and the second end. The needle can be inserted into the first elastic layer (4) and at least one second elastic layer (6) in sequence to communicate with the fluid channel (1). The second elastic layer (6) has deformation capability. When the needle is separated from the two elastic layers, the second elastic layer (6) becomes a sealing layer.
5. The plastic nail according to claim 4, characterized in that: The first end (2) is formed with a conical nail head, the conical nail head is a hollow structure, the rubber nail body between the conical nail head and the second elastic layer (6) close to the conical nail head is a first cavity structure, and the first cavity structure is connected with the hollow structure to form the fluid channel (1); The glue nail body between two adjacent second elastic layers (6) is a second cavity structure, and the glue nail body between the first elastic layer (4) and the second elastic layer (6) close to the first elastic layer (4) is a third cavity structure.
6. The plastic nail according to claim 4, characterized in that: The thickness of the first elastic layer (4) is 1.5 mm-2.5 mm; And / or, the thickness of the second elastic layer (6) is 1.5 mm-2.5 mm.
7. The plastic nail according to claim 1, characterized in that: The first elastic layer (4) is provided with a first notch (7) and a second notch (8), wherein the first notch (7) and the second notch (8) intersect in a cross shape.
8. The plastic nail according to claim 1, characterized in that: The length from the end surface of the first end (2) to the end surface of the second end is H, 13mm≤H≤16mm.
9. A battery formation process using the adhesive nail as claimed in claim 1, characterized in that: include: S1, injecting liquid into the battery for the first time through the liquid injection hole of the battery, and then inserting the first end (2) of the glue nail into the liquid injection hole; S2, battery infiltration and formation. During formation, the exhaust needle is inserted into the first elastic layer (4) and connected to the fluid channel (1) to extract the gas in the battery.
10. The battery formation process according to claim 9, characterized in that: Also includes: The battery is injected with liquid for the second time: the injection needle is inserted into the first elastic layer (4) and connected with the fluid channel (1) to inject liquid into the battery.