Suction nozzle, formation device and battery production equipment
By using a suction nozzle with a breathable membrane during the formation of lithium-ion batteries, the problem of overflow of electrolyte during the gas discharge process is solved, the loss and contamination of electrolyte is reduced, and the efficiency of battery formation is improved.
Patent Information
- Application Number
- CN202420826341.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-17
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-04-17
AI Technical Summary
During the formation of lithium-ion batteries, the gas generated inside the battery will take away the electrolyte, resulting in contamination and loss of the electrolyte.
A suction nozzle is designed, including a pumping channel and a breathable membrane. The pumping channel is in communication with the injection hole of the battery cell and provides a negative pressure through a negative pressure source. The breathable membrane is made of expanded polytetrafluoroethylene material to prevent the electrolyte from overflowing.
It effectively reduces the probability of electrolyte contaminating the nozzle structure, reduces the loss of electrolyte, and improves the efficiency of the battery formation process.
Smart Images
Figure CN222867762U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of battery technology, and in particular to a nozzle, a formation device and a battery production equipment. Background Art
[0002] In the production process of lithium-ion batteries, the formation process plays a key role in the quality of the battery. During the formation process, a large amount of gas will be generated inside the battery, so a corresponding formation device is required to discharge the gas. When the gas is discharged from the pipeline, the electrolyte inside the battery cell will be taken out. Summary of the invention
[0003] The present disclosure provides a nozzle, a formation device and a battery production equipment to at least solve the above technical problems existing in the prior art.
[0004] A first aspect of the present disclosure provides a nozzle, comprising: a body, the body being formed with an air extraction channel, the air extraction channel comprising a first end for communicating with a liquid injection hole of a battery cell and a second end for communicating with a negative pressure source;
[0005] Wherein, the first end is provided with a breathable membrane for preventing electrolyte from overflowing.
[0006] Furthermore, the breathable membrane is made of expanded polytetrafluoroethylene material.
[0007] Furthermore, the breathable membrane includes one or more layers of expanded polytetrafluoroethylene membranes stacked together.
[0008] Furthermore, the breathable membrane is bonded to the first end or connected via a fastener.
[0009] Further, the air extraction channel includes a first channel, a second channel and a third channel which are connected in sequence, the first end is located at an end of the first channel away from the third channel, and the second end is located at an end of the third channel away from the first channel;
[0010] An extension direction of at least a portion of the inner wall of the second channel intersects with a penetration direction of the air extraction channel.
[0011] Furthermore, along the direction from the first end to the second end, the inner diameter of the second channel gradually increases.
[0012] Further, the first channel includes a first hole segment, a second hole segment and a third hole segment which are connected in sequence;
[0013] The aperture of the first hole segment is smaller than the aperture of the second hole segment;
[0014] The hole diameter of the second hole segment is smaller than the hole diameter of the third hole segment.
[0015] Furthermore, the inner wall of the first channel or the second channel is funnel-shaped.
[0016] A second aspect of the present disclosure provides a formation device, comprising the nozzle described in the first aspect, wherein the negative pressure assembly is connected to the second end and is used to provide negative pressure to the interior of the battery cell.
[0017] A third aspect of the present disclosure provides a battery production device, comprising the formation device described in the second aspect.
[0018] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:
[0019] The nozzle provided by the embodiment of the present disclosure includes a body, the body is formed with an exhaust channel, the exhaust channel includes a first end for communicating with the injection hole of the battery cell and a second end for communicating with the negative pressure source; wherein the first end is provided with a breathable membrane for preventing electrolyte from overflowing. When in use, the first end can be directly docked with the injection port on the battery cell, so that the exhaust channel is connected with the inside of the battery cell. During the formation process of the battery cell, as the gas inside the battery cell is extracted from the exhaust channel, the electrolyte inside the battery cell will not overflow or overflow will be reduced under the action of the breathable membrane, thereby reducing the probability of electrolyte contamination of the nozzle structure and reducing the loss of electrolyte.
[0020] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:
[0022] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.
[0023] Figure 1 A schematic cross-sectional structure diagram of a nozzle provided in an embodiment of the present disclosure is shown.
[0024] Explanation of the numbers in the figure: 1, main body; 11, first channel; 111, first hole section; 112, second hole section; 113, third hole section; 12, second channel; 13, third channel; 2, breathable membrane. DETAILED DESCRIPTION
[0025] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.
[0026] like Figure 1 As shown, the nozzle provided by the embodiment of the present disclosure includes a body 1, and the body 1 is formed with an exhaust channel, and the exhaust channel includes a first end for communicating with the injection hole of the battery cell and a second end for communicating with the negative pressure source; wherein the first end is provided with a breathable membrane 2 for preventing electrolyte from overflowing. When in use, the first end can be directly docked with the injection port on the battery cell, so that the exhaust channel is connected with the inside of the battery cell. During the formation process of the battery cell, as the gas inside the battery cell is extracted from the exhaust channel, the electrolyte inside the battery cell will not overflow or reduce overflow under the action of the breathable membrane 2, thereby reducing the probability of electrolyte contamination of the nozzle structure and reducing the loss of electrolyte.
[0027] In some specific embodiments, the breathable membrane 2 is made of expanded polytetrafluoroethylene material.
[0028] E-PTFE (expanded polytetrafluoroethylene) electrolyte membrane is used to isolate liquid molecules. The specific principle is as follows:
[0029] 1. Material structure
[0030] The ePTEE membrane is highly resistant to chemicals and temperatures, and has a microporous structure. These micropores prevent the electrolyte from passing through in a liquid state, thereby achieving an anti-overflow function. At the same time, these micropores allow air molecules to pass through, achieving a breathable function.
[0031] The formation of this microporous structure is achieved through a special processing technology. First, the ePTFE membrane is stretched to form a series of continuous fibers. Then, these fibers are ablated to form a microstructure. The ePTFE has excellent chemical resistance, so the membrane will not be damaged during the ablation process, and the size and shape of the micropores are also maintained.
[0032] 2. Molecular kinematics
[0033] The key to the micropores in the electrolyte-proof breathable membrane 2 being able to achieve electrolyte-proof and breathable properties lies in molecular kinematics. The pore size of the micropores is smaller than that of the electrolyte molecules, but larger than that of the gas molecules, so the electrolyte molecules cannot pass through the micropores, while the gas molecules can pass through the micropores to achieve internal breathability. Factors such as the size, distribution and density of the micropores in the electrolyte-proof breathable membrane 2 directly affect the penetration and evaporation rate of the electrolyte. Therefore, different micropore structures need to be designed for different use environments and purposes to achieve optimal electrolyte-proof breathable performance.
[0034] 3. Surface tension
[0035] The microporous structure in the electrolyte-proof breathable membrane 2 can effectively reduce the residence time of the electrolyte on the membrane, avoiding the electrolyte from staying for a long time and causing liquid penetration. This is mainly because the tension on the membrane surface causes the electrolyte to form a spherical droplet, which cannot further penetrate in the micropores. By adjusting the surface tension of the electrolyte-proof breathable membrane 2, its electrolyte-proof breathable performance can also be improved, making it suitable for different environmental conditions.
[0036] In some specific embodiments, the breathable membrane 2 includes one or more layers of expanded polytetrafluoroethylene membranes, which reduces the possibility of electrolyte overflow, thereby reducing the probability of electrolyte contamination of the nozzle structure and reducing electrolyte loss.
[0037] In some specific embodiments, the breathable membrane 2 is bonded to the first end or connected via a fastener, which has a simple structure and is easy to install.
[0038] In some specific embodiments, the exhaust channel includes a first channel 11, a second channel 12 and a third channel 13 which are connected in sequence, the first end is located at an end of the first channel 11 away from the third channel 13, and the second end is located at an end of the third channel 13 away from the first channel 11; the extension direction of at least part of the inner wall of the second channel 12 is arranged to intersect with the penetration direction of the exhaust channel, thereby reducing the probability of the electrolyte contaminating the nozzle structure and the shell of the battery cell, and can reduce the loss of the electrolyte.
[0039] When the battery cell is evacuated, the liquid injection port of the battery cell is usually arranged upward, that is, the evacuation channel is extended in the direction of gravity and is connected to the liquid injection port. During the evacuation process, the gas inside the battery cell is discharged through the evacuation channel. At the same time, the electrolyte inside the battery cell may enter the evacuation channel or even be taken out of the evacuation channel. When the evacuation is completed, the electrolyte flows back along the inner wall of the second channel 12 in the evacuation channel under the action of its own gravity.
[0040] In some specific embodiments, the inner diameter of the second channel 12 gradually increases from the first end to the second end, which facilitates electrolyte reflux, thereby reducing the probability of electrolyte contaminating the nozzle structure and the shell of the battery cell and reducing electrolyte loss.
[0041] In some specific embodiments, the first channel 11 includes a first hole segment 111, a second hole segment 112 and a third hole segment 113 which are connected in sequence; the aperture of the first hole segment 111 is smaller than the aperture of the second hole segment 112; the aperture of the second hole segment 112 is smaller than the aperture of the third hole segment 113, which facilitates the reflux of the electrolyte, thereby reducing the probability of the electrolyte contaminating the nozzle structure and the shell of the battery cell, and can reduce the loss of the electrolyte.
[0042] In some specific embodiments, the inner wall of the first channel 11 or the second channel 12 is funnel-shaped, which facilitates the reflux of the electrolyte, thereby reducing the probability of the electrolyte contaminating the nozzle structure and the shell of the battery cell and reducing the loss of the electrolyte.
[0043] The formation device provided by the embodiment of the present disclosure includes the nozzle provided by the embodiment of the present disclosure, and the negative pressure component is connected to the second end to provide negative pressure inside the battery cell. The formation device provided by the embodiment of the present disclosure has the same advantages as the nozzle provided by the embodiment of the present disclosure, which will not be repeated here.
[0044] The battery production equipment provided in the embodiment of the present disclosure includes the formation device provided in the embodiment of the present disclosure. Since the battery production equipment provided in the embodiment of the present disclosure has the same advantages as the formation device provided in the embodiment of the present disclosure, they will not be described in detail here.
[0045] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.
[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0047] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.
Claims
1. A nozzle, characterized in that: include: A body (1), wherein the body (1) is formed with an air extraction channel, wherein the air extraction channel comprises a first end for communicating with a liquid injection hole of a battery cell and a second end for communicating with a negative pressure source; Wherein, the first end is provided with a breathable membrane (2) for preventing electrolyte from overflowing; The air extraction channel comprises a first channel (11), a second channel (12) and a third channel (13) which are connected in sequence, the first end is located at an end of the first channel (11) away from the third channel (13), and the second end is located at an end of the third channel (13) away from the first channel (11); The extension direction of at least part of the inner wall of the second channel (12) is arranged to intersect with the penetration direction of the air extraction channel; The first channel (11) comprises a first hole section (111), a second hole section (112) and a third hole section (113) which are connected in series; The aperture of the first hole section (111) is smaller than the aperture of the second hole section (112); The hole diameter of the second hole section (112) is smaller than the hole diameter of the third hole section (113).
2. The nozzle according to claim 1, characterized in that: The breathable membrane (2) is made of expanded polytetrafluoroethylene material.
3. The nozzle according to claim 1, characterized in that: The breathable membrane (2) comprises one or more layers of expanded polytetrafluoroethylene membranes stacked together.
4. The nozzle according to claim 1, characterized in that: The breathable membrane (2) is bonded to the first end or connected via a fastener.
5. The nozzle according to claim 1, characterized in that: The inner diameter of the second channel (12) gradually increases along the direction from the first end to the second end.
6. The nozzle according to claim 1, characterized in that: The inner wall of the first channel (11) or the second channel (12) is funnel-shaped.
7. A chemical formation device, characterized in that: It comprises a negative pressure component and the suction nozzle according to any one of claims 1 to 6, wherein the negative pressure component is connected to the second end and is used to provide negative pressure to the inside of the battery cell.
8. A battery production equipment, characterized in that: Comprising the formation device as claimed in claim 7.