Formation negative pressure cup

Abstract

The utility model relates to the technical field of batteries, and discloses a formation negative pressure cup which comprises a negative pressure cup body and a gas-liquid separator, the negative pressure cup body is provided with a first accommodating cavity and a first outlet, and the first accommodating cavity is arranged in the negative pressure cup body and is suitable for being communicated with a battery liquid injection hole; the gas-liquid separator is arranged in the negative pressure cup body and comprises a shell and a filter element, the filter element is arranged in the shell, a second containing cavity is defined by the filter element and the shell, an inlet is formed in the bottom of the shell, the second containing cavity and the first containing cavity are communicated through the inlet, and a second outlet is formed in the top of the shell. According to the negative pressure cup, the gas-liquid separator is arranged on the negative pressure cup body, a gas-liquid mixture generated in the battery formation process is effectively separated and recycled, gas can penetrate through the filter element and is discharged, and liquid electrolyte is reserved in the second containing cavity. And when the vacuum is broken, the liquid electrolyte flows back into the battery, so that the loss of the electrolyte is obviously reduced, the electrolyte needing to be cleaned is less, the maintenance cost is reduced, and the service life of an electrical system is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a formation negative pressure cup. Background Technology

[0002] After assembly, the battery needs to be activated through a specific charging and discharging process (formation process) to activate its internal positive and negative electrode materials. During this process, the electrolyte undergoes a decomposition reaction on the positive and negative electrode surfaces, generating a large amount of gas. If the gas is not released in time, it can cause the battery casing to bulge and deform, and may even lead to poor adhesion between the positive and negative electrode plates, resulting in a decline in battery performance.

[0003] Currently, negative pressure devices are typically installed on the formation equipment to expel the gases generated during battery formation. The gas production state varies depending on the battery type, but the negative pressure system cannot adjust it in real time. Furthermore, gas production can cause the electrolyte inside the battery to "boil." Therefore, the venting process also carries away a large amount of electrolyte (in droplet form). Some of this electrolyte temporarily remains in the negative pressure cup and is supposed to flow back into the battery after the negative pressure is applied. However, because the gas-liquid separator is positioned at a certain distance from the negative pressure cup, some electrolyte can easily enter the electrical system and cannot flow back to the negative pressure cup in time, resulting in electrolyte waste. The residual electrolyte (i.e., the wasted electrolyte) easily crystallizes, making it difficult to clean and corroding the negative pressure device, leading to higher maintenance costs later on. Utility Model Content

[0004] In view of this, the present invention provides a negative pressure cup for battery formation to solve the problem that venting through a negative pressure device during battery formation wastes electrolyte, and the residual electrolyte is difficult to clean, resulting in high maintenance costs.

[0005] This utility model provides a negative pressure cup for chemical formation, comprising:

[0006] The negative pressure cup body has a first receiving cavity and a first outlet. The first receiving cavity is located in the negative pressure cup body and is adapted to communicate with the battery filling hole. The first outlet is adapted to communicate with the negative pressure pipeline.

[0007] A gas-liquid separator is disposed within the negative pressure cup body and includes a housing and a filter element. The filter element is disposed within the housing and forms a second receiving cavity with the housing. The bottom of the housing is provided with an inlet that connects the second receiving cavity and the first receiving cavity. The top of the housing is provided with a second outlet that connects to the first outlet on the negative pressure cup body.

[0008] Beneficial Effects: This invention integrates a gas-liquid separator into the negative pressure cup body. During battery formation, the gas-liquid mixture, under the influence of negative pressure, enters the first receiving cavity of the negative pressure cup body through the battery injection hole. It then passes through the inlet into the second receiving cavity between the gas-liquid separator's shell and filter element. Gas passes through the filter element and is discharged, while the liquid electrolyte remains in the second receiving cavity. When the vacuum is broken, the liquid electrolyte flows back from the inlet of the shell to the first receiving cavity and finally returns to the battery, significantly reducing electrolyte loss. Furthermore, the amount of residual electrolyte and crystals requiring cleaning is reduced, thus lowering maintenance costs and extending the lifespan of the negative pressure equipment. In addition, it eliminates the need for a post-residue cup in traditional negative pressure devices, reducing personnel and equipment costs. Attached Figure Description

[0009] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of a chemically formed negative pressure cup according to an embodiment of the present utility model;

[0011] Figure 2 for Figure 1 A sectional view;

[0012] Figure 3 for Figure 1 Exploded view;

[0013] Figure 4 This is a schematic diagram of the structure of a filter element for forming a negative pressure cup according to an embodiment of the present utility model;

[0014] Figure 5 This is a schematic diagram of the structure of a flow guide for forming a negative pressure cup according to an embodiment of the present utility model;

[0015] Figure 6 This is a schematic diagram of the structure of a chemically formed negative pressure cup according to another embodiment of the present invention;

[0016] Figure 7 for Figure 6 A sectional view.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Negative pressure cup body; 101. First receiving cavity; 102. Interface; 2. Gas-liquid separator; 201. Shell; 202. Filter element; 2021. Filter screen; 2022. Mesh; 203. Second receiving cavity; 204. Extension; 3. Flow guide; 301. Base plate; 302. Spiral blade; 303. Mounting post; 4. Cover plate; 5. Connector. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] The following is combined Figures 1 to 7 The following describes embodiments of the present invention.

[0021] According to embodiments of the present invention, such as Figure 1 and Figure 2 As shown, a negative pressure cup for chemical formation is provided, comprising: a negative pressure cup body 1 and a gas-liquid separator 2. The negative pressure cup body 1 has a first receiving cavity 101 and a first outlet. The first receiving cavity 101 is disposed within the negative pressure cup body 1 and is adapted to communicate with a battery filling hole. The first outlet is adapted to communicate with a negative pressure pipeline. The gas-liquid separator 2 is disposed within the negative pressure cup body 1 and includes a housing 201 and a filter element 202. The filter element 202 is disposed within the housing 201 and together with the housing 201 forms a second receiving cavity 203. The bottom of the housing 201 has an inlet that connects the second receiving cavity 203 and the first receiving cavity 101. The top of the housing 201 has a second outlet that communicates with the first outlet on the negative pressure cup body 1.

[0022] The negative pressure cup provided in this embodiment integrates a gas-liquid separator 2 on the negative pressure cup body 1. The gas-liquid mixture generated during the battery formation process is affected by the negative pressure and enters the first receiving cavity 101 of the negative pressure cup body 1 through the battery injection hole. Then, it passes through the inlet into the second receiving cavity 203 between the housing 201 and the filter element 202 of the gas-liquid separator 2. The gas can pass through the filter element 202 and be discharged, while the liquid electrolyte remains in the second receiving cavity 203. When the vacuum is broken, the liquid electrolyte flows back from the inlet of the housing 201 to the first receiving cavity 101 and finally returns to the battery, thereby significantly reducing the loss of electrolyte.

[0023] Traditional negative pressure devices cannot avoid electrolyte loss, thus requiring regular cleaning of residual electrolyte to prevent corrosion of the electrical system. This invention reduces electrolyte loss, consequently decreasing the amount of residual electrolyte and crystals that need cleaning, thereby lowering maintenance costs and extending the lifespan of the negative pressure equipment. Furthermore, it eliminates the need for a post-installed residual electrolyte cup, reducing personnel and equipment costs.

[0024] Traditional negative pressure devices lose approximately 10 grams of electrolyte per battery. However, by using the negative pressure cup of this invention, the electrolyte loss per battery is reduced to approximately 0.5 grams, demonstrating a significant improvement.

[0025] Specifically, such as Figure 1 As shown, the bottom of the first receiving cavity 101 of the negative pressure cup body 1 is provided with an interface 102, which communicates with the battery filling hole. The negative pressure cup body 1 receives the gas-liquid mixture discharged from the battery filling hole through the interface 102. The volume of the first receiving cavity 101 needs to be adapted to the type of battery. The top of the filter element 202 is fixed to the upper end of the housing 201. The periphery and bottom of the filter element 202 are respectively left with gaps from the housing 201 to form a second receiving cavity 203. The second outlet of the housing 201 communicates with the first outlet on the negative pressure cup body 1, and the first outlet is then connected to the negative pressure pipeline.

[0026] It should be noted that the structure of the filter element 202 is not limited in this embodiment of the utility model, as long as the filter element 202 can separate gas and liquid electrolyte.

[0027] In one embodiment, such as Figure 4 As shown, the filter element 202 includes multiple layers of filter screens 2021, each layer of filter screens 2021 having multiple mesh openings 2022 at intervals. The size of the mesh openings 2022 in each layer of filter screens 2021 decreases progressively from the outside to the inside, achieving turbulence and deceleration effects, which is beneficial for gas-liquid separation. An inner cavity is formed inside the filter element 202, which is connected to the second outlet. The gas in the gas-liquid mixture can pass through the mesh openings 2022 of the multiple layers of filter screens 2021 in sequence, enter the inner cavity, flow through the second outlet to the first outlet, and finally enter the negative pressure pipeline. The liquid electrolyte is blocked and intercepted by the multiple layers of filter screens 2021 in the second receiving cavity 203. After the vacuum in the negative pressure cup body 1 is broken, the liquid electrolyte flows back from the inlet of the shell 201 to the first receiving cavity 101 under the action of gravity, and then from the first receiving cavity 101 through the interface 102 and the battery injection hole, finally returning to the battery, avoiding electrolyte loss.

[0028] It should be noted that the number of layers of the filter 2021 in this embodiment can be selected as two, three, or more layers according to actual needs. In addition, the shape of the mesh 2022 can be conventional shapes such as round holes, square holes, and elliptical holes, or irregular shapes, as needed. This embodiment does not impose too many restrictions on this.

[0029] Furthermore, in one embodiment, such as Figure 4 As shown, both the housing 201 and the filter screen 2021 are cylindrical, and the multiple layers of filter screens 2021 are coaxially arranged in sequence, which is simple in structure and easy to manufacture.

[0030] Furthermore, in one embodiment, the multi-layer filter 2021 is arranged in a spiral pattern from the inside out for easy installation and use.

[0031] Furthermore, in one embodiment, such as Figure 4 As shown, the mesh openings 2022 of each filter layer 2021 are misaligned in the radial projection of the filter 2021 to prevent the liquid electrolyte from directly passing through the mesh openings 2022 and entering the inner cavity.

[0032] Furthermore, in one embodiment, the mesh openings 2022 of each filter layer 2021 have no overlapping areas in the radial projection of the filter 2021, further preventing liquid electrolyte from passing through the mesh openings 2022 and entering the inner cavity, resulting in more thorough gas-liquid separation.

[0033] To improve the service life of filter 2021, in one embodiment, filter 2021 is an electrolyte-resistant filter to prevent corrosion by the electrolyte. The electrolyte-resistant filter is any one of stainless steel, polypropylene, or alumina ceramic.

[0034] In one embodiment, such as Figure 2 and Figure 3 As shown, the negative pressure cup also includes a flow guide 3, which is located at the inlet and guides the gas-liquid mixture flowing in through the inlet to rotate and flow towards the inner wall of the housing 201. By setting the flow guide 3 at the inlet, the gas-liquid mixture flowing in through the inlet can enter the second receiving cavity 203 in the form of a rotating airflow. This causes most of the liquid electrolyte to be thrown onto the inner wall of the housing 201 under the action of centrifugal force, forming preliminary gas-liquid separation. A small portion of the liquid electrolyte flows with the gas to the filter element 202, and under the obstruction of the multi-layer filter screen 2021, secondary gas-liquid separation is achieved. This prevents the liquid electrolyte from directly passing through the filter element 202, further improving the gas-liquid separation effect.

[0035] It should be noted that the present invention does not limit the structure of the flow guide 3, as long as the flow guide 3 can guide the gas-liquid mixture flowing in from the inlet to rotate and flow towards the inner wall of the housing 201.

[0036] In one embodiment, such as Figure 2 and Figure 5 As shown, the flow guide 3 is disposed within the second receiving cavity 203. The flow guide 3 includes a base plate 301, a plurality of spiral blades 302 spaced apart at the lower end of the base plate 301, and a plurality of mounting posts 303. The plurality of mounting posts 303 are distributed around the inlet and connected to the bottom of the housing 201. The plurality of spiral blades 302 are arranged circumferentially along the base plate 301 and located above the inlet. The base plate 301 is used to mount the plurality of spiral blades 302 and can also block the gas-liquid mixture, preventing the gas-liquid mixture from flowing directly to the filter element 202.

[0037] Furthermore, in one embodiment, multiple helical blades 302 may be selectively fixed to the lower end of the substrate 301, for example, the multiple helical blades 302 are integrally formed with the substrate 301 to guide airflow. Additionally, the mounting post 303 may also be integrally formed with the substrate 301 for installation and use. The gas-liquid mixture flowing in at the inlet, after contacting the multiple helical blades 302, changes its flow direction to enter the gas-liquid separator 2 for gas-liquid separation.

[0038] Furthermore, in one embodiment, a plurality of helical blades 302 are rotatably disposed at the lower end of the substrate 301. Specifically, a turntable is provided at the lower end of the substrate 301, and the plurality of helical blades 302 are rotatably disposed at the lower end of the substrate 301 via the turntable. For example, a bearing is provided at the lower end of the substrate 301, and the turntable is connected through the bearing. The bearing provides smooth rotational support and reduces friction. The bearing includes deep groove ball bearings, cylindrical roller bearings, tapered roller bearings, etc. In this case, the plurality of helical blades 302 are used to form a rotating airflow. After the gas-liquid mixture flowing in at the inlet comes into contact with the plurality of helical blades 302, it changes the flow direction and rotates in the same direction, thereby forming a rotating airflow and generating centrifugal force, which throws the liquid electrolyte toward the inner wall of the housing 201. The mounting post 303 is used to support the substrate 301.

[0039] Furthermore, in one embodiment, the flow guide 3 may also be equipped with a drive component, with the turntable connected to the drive component. The drive component can drive the turntable to rotate multiple spiral blades 302 to form a strong rotating airflow, increase centrifugal force, and improve the gas-liquid separation effect. The drive component can be a motor.

[0040] It should be noted that this embodiment of the invention does not limit the number of spiral blades 302; two, three, or more can be selected as needed. Similarly, the number of mounting posts 303 can also be selected as two, three, or more as needed.

[0041] Furthermore, this embodiment of the invention does not limit the connection relationship between the mounting post 303 and the bottom of the housing 201; any existing structure can be selected as needed. For example, the mounting post 303 and the housing 201 can be connected by a snap-fit, facilitating quick installation and disassembly. Alternatively, the mounting post 303 and the housing 201 can be bonded together with adhesive for a secure connection.

[0042] Furthermore, in one embodiment, such as Figure 4 As shown, multiple mesh openings 2022 are spaced apart on the side wall of the filter screen 2021. The top of the filter screen 2021 is fixed to the housing 201, and the bottom of the filter screen 2021 is closed to prevent liquid electrolyte from directly penetrating the bottom of the filter element 202 and entering the inner cavity.

[0043] In one embodiment, such as Figure 2 As shown, the top of the negative pressure cup body 1 is provided with a cover plate 4, the cover plate 4 is provided with a mounting hole, the top of the housing 201 is provided with an extension 204, the second outlet is provided in the extension 204 and communicates with the inner cavity of the filter element 202, and the extension 204 is sealed and passed through the mounting hole to connect the negative pressure cup body 1 and the gas-liquid separator 2.

[0044] Specifically, the upper end of the negative pressure cup body 1 is provided with an opening, and the cover plate 4 is sealed and detachably connected to the negative pressure cup body 1 to form a first receiving cavity 101. For example, the cover plate 4 and the negative pressure cup body 1 are snapped together. The outer periphery of the extension 204 is also provided with external threads, and the inner side of the mounting hole is provided with internal threads that are threadedly connected to the extension 204.

[0045] Furthermore, such as Figure 2 and Figure 3 As shown, the upper end of the cover plate 4 is also provided with a connector 5, which is located on the first outlet. One end of the connector 5 is connected to the second outlet of the extension 204, and the other end is connected to the negative pressure pipeline. After the gas enters the inner cavity, it passes through the second outlet of the extension 204 and the connector 5 in sequence, and then enters the negative pressure pipeline through the connector 5.

[0046] In some other embodiments, such as Figure 6 and Figure 7 As shown, the gas-liquid separator 2 can also be installed outside the negative pressure cup body 1 to reduce the impact of the gas-liquid separator 2 on the negative pressure cup body 1.

[0047] Specifically, the top of the negative pressure cup body 1 is provided with a cover plate 4, the cover plate 4 is provided with a connection hole communicating with the first receiving cavity 101, the bottom of the shell 201 is located at the top of the cover plate 4, and the inlet is communicating with the connection hole.

[0048] Similarly, the upper end of the negative pressure cup body 1 is provided with an opening, and the cover plate 4 is sealed on the opening and detachably connected to the negative pressure cup body 1 to form a first receiving cavity 101.

[0049] The working principle of this utility model embodiment is as follows:

[0050] The interface 102 at the bottom of the negative pressure cup body 1 is connected to the battery electrolyte filling hole. During the battery formation process, a gas-liquid mixture is generated, which first enters the first receiving cavity 101 of the negative pressure cup body 1 under the action of negative pressure. After passing through the first receiving cavity 101, the gas-liquid mixture enters the second receiving cavity 203 from the inlet at the bottom of the shell 201 and comes into contact with multiple spiral blades 302. Under the action of the spiral blades 302, the gas-liquid mixture changes its flow direction and rotates in the same direction, thereby forming a rotating airflow and generating centrifugal force. Most of the liquid electrolyte is thrown onto the inner wall of the shell 201 under the action of centrifugal force and accumulates at the inlet under the action of tension and gravity. A small portion of the liquid electrolyte flows with the gas to the filter element 202. The gas can pass through the multi-layer filter screen 2021, and after being turbulently deflected and slowed down by the multi-layer filter screen 2021, it enters the inner cavity of the filter element 202 and exits from the second outlet to the first outlet, finally entering the negative pressure pipeline. The liquid electrolyte is blocked by the filter screen 2021 and remains in the second receiving cavity 203, accumulating at the inlet. When the vacuum is broken, the liquid electrolyte flows back from the inlet of the casing 201 to the first receiving cavity 101, and finally returns to the inside of the battery.

[0051] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A formation negative pressure cup characterized by, The application relates to a negative pressure cup body (1) provided with a first containing cavity (101) and a first outlet, the first containing cavity (101) is arranged in the negative pressure cup body (1) and is adapted to communicate with a battery liquid injection hole, and the first outlet is adapted to communicate with a negative pressure pipeline; a gas-liquid separator (2) is arranged in the negative pressure cup body (1) and comprises a shell (201) and a filter element (202), the filter element (202) is arranged in the shell (201) and forms a second containing cavity (203) together with the shell (201), the bottom of the shell (201) is provided with an inlet, the second containing cavity (203) and the first containing cavity (101) are communicated through the inlet, the top of the shell (201) is provided with a second outlet, and the second outlet is communicated with the first outlet on the negative pressure cup body (1). The filter element (202) comprises a plurality of layers of filter screens (2021), each layer of the filter screens (2021) is provided with a plurality of screen holes (2022) which are spaced apart, and the sizes of the screen holes (2022) of each layer of the filter screens (2021) gradually decrease from outside to inside. The filter screen (2021) is in a cylindrical shape, and the plurality of layers of filter screens (2021) are coaxially arranged in sequence.

2. The formation negative pressure cup of claim 1, wherein, And / or, the plurality of layers of filter screens (2021) are arranged in a winding mode from inside to outside.

3. The formation negative pressure cup of claim 2, wherein, The screen holes (2022) of each layer of the filter screens (2021) are staggered in the projection of the filter screen (2021) in the radial direction. The plurality of screen holes (2022) are arranged at the side wall of the filter screen (2021) in a spaced mode, and the bottom of the filter screen (2021) is closed.

4. The formation negative pressure cup of claim 3, wherein, The filter screen (2021) is an electrolyte-resistant filter screen, and the electrolyte-resistant filter screen is any one of a stainless steel filter screen, a polypropylene filter screen and an alumina ceramic filter screen.

5. The formation negative pressure cup of claim 4, wherein, The application further comprises a flow guide (3) arranged at the inlet and used for guiding the rotational flow of a gas-liquid mixture flowing into the inlet to the inner wall of the shell (201).

6. The formation negative pressure cup of claim 3, wherein, The flow guide (3) comprises a base plate (301), a plurality of spiral blades (302) arranged at the lower end of the base plate (301) in a spaced mode and a plurality of mounting columns (303) distributed around the inlet and connected with the bottom of the shell (201), and the plurality of spiral blades (302) are arranged along the circumference of the base plate (301) and located above the inlet.

7. The formation negative pressure cup according to any one of claims 1 to 6, wherein, The plurality of spiral blades (302) are rotatably arranged at the lower end of the base plate (301).

8. The formation negative pressure cup of claim 7, wherein, The top of the negative pressure cup body (1) is provided with a cover plate (4) provided with a mounting hole, the top of the shell (201) is provided with an extension (204), the second outlet is arranged in the extension (204) and communicated with the inner cavity of the filter element (202), and the extension (204) is sealingly arranged in the mounting hole.

9. The formation negative pressure cup of claim 8, wherein, ​ 10. The formation negative pressure cup according to any one of claims 1 to 6, wherein, ​

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