Liquid injection device for preventing backflow of electrolyte

Abstract

The utility model provides an electrolyte injection device capable of preventing electrolyte from flowing back, and belongs to the field of lithium battery processing. The device comprises a cup body and a spoiler, a cavity is formed in the cup body, an upper pipe connector is arranged at the top of the cup body, a lower pipe connector is arranged at the bottom of the cup body, a positive and negative pressure pipe connector is arranged on the side, close to the top, of the cup body, and the upper pipe connector, the lower pipe connector and the positive and negative pressure pipe connector are communicated with the cavity; the spoiler abuts against the inner wall of the cavity, a first connecting hole is formed in the top of the spoiler, a second connecting hole matched with the first connecting hole is formed in the bottom of the spoiler, a third connecting hole is formed in the side face of the spoiler, and the first connecting hole and the second connecting hole are communicated through the third connecting hole. The first connecting holes and the second connecting holes are arranged at intervals in the direction of the third connecting holes. By adopting the electrolyte injection device capable of preventing electrolyte backflow provided by the embodiment of the utility model, the problem of electrolyte backflow in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the field of lithium battery processing, in particular to a liquid injection device for preventing electrolyte backflow. Background Art

[0002] With the continuous development of the new energy industry, lithium batteries are widely used in all walks of life. In the process of lithium battery production, injecting electrolyte into the battery is an important process. The device that injects electrolyte into the battery is called an injection device.

[0003] In the existing related technology, the injection device is usually a cup-shaped container, through which the electrolyte is injected into the injection hole of the battery. After the electrolyte is added to the cup-shaped container, positive and negative pressures are circulated in the cup-shaped container to inject the electrolyte into the battery. However, the positive and negative pressures are circulated using a common pipe, and when the pressure is released, the electrolyte will flow to the air pressure pipe according to the pressure release direction.

[0004] The liquid injection device in the prior art may cause electrolyte reflux when circulating positive and negative pressures. Utility Model Content

[0005] The embodiment of the utility model provides a liquid injection device for preventing electrolyte backflow, which can solve the problem of electrolyte backflow in the prior art. The technical solution is as follows:

[0006] A liquid injection device for preventing electrolyte backflow, comprising: a cup body and a spoiler,

[0007] A cavity is provided inside the cup body, an upper pipe joint is provided on the top of the cup body, a lower pipe joint is provided on the bottom of the cup body, and positive and negative pressure pipe joints are provided on one side of the cup body close to the top, and the upper pipe joint, the lower pipe joint and the positive and negative pressure pipe joints are connected to the cavity.

[0008] The spoiler is horizontally arranged in the cavity, the spoiler abuts against the inner wall of the cavity, a first connecting hole is opened at the top of the spoiler, a second connecting hole matching the first connecting hole is opened at the bottom of the spoiler, a third connecting hole is opened at the side of the spoiler, the first connecting hole and the second connecting hole are connected through the third connecting hole, and the first connecting hole and the second connecting hole are arranged at intervals along the direction of the third connecting hole.

[0009] Optionally, a plurality of groups of the first connection holes, the second connection holes and the third connection holes which are interconnected are provided on the spoiler, and the plurality of groups of the first connection holes, the second connection holes and the third connection holes are arranged at equal angles.

[0010] Optionally, a plurality of spoilers are provided, and the plurality of spoilers are arranged in parallel and at intervals.

[0011] Optionally, the cup body includes a cup wall, an upper cup cover and a lower cup cover, the upper cup cover is arranged on the top of the cup wall, the upper cup cover is detachably connected to the cup wall, the lower cup cover is arranged on the bottom of the cup wall, the lower cup cover is detachably connected to the cup wall, the upper pipe joint is arranged on the upper cup cover, and the lower pipe joint is arranged on the lower cup cover.

[0012] Optionally, the upper cup cover and the lower cup cover are respectively threadedly connected to the cup wall.

[0013] Optionally, a first sealing ring is provided between the upper cup cover, the lower cup cover and the cup wall, a second sealing ring is provided between the upper pipe joint and the upper cup cover, and a third sealing ring is provided between the lower pipe joint and the lower cup cover.

[0014] Optionally, the inner cavity includes a first inner cavity and a second inner cavity that are interconnected, the inner diameters of the first inner cavity and the second inner cavity are different, and the spoiler is installed at the intersection of the first inner cavity and the second inner cavity.

[0015] Optionally, the spoiler is made of stainless steel.

[0016] The beneficial effects brought by the technical solution provided by the embodiment of the utility model include at least:

[0017] The utility model embodiment provides a liquid injection device for preventing electrolyte backflow, which connects the lower pipe joint to the liquid injection hole of the battery, adds electrolyte from the upper pipe joint, applies positive and negative pressure to the internal circulation of the cavity through the positive and negative pressure pipe joints, and arranges a spoiler inside the cup body. When the pressure is released, the electrolyte can flow through the second connecting hole and the third connecting hole and flow back to the first connecting hole, thereby increasing the flow distance of the electrolyte, thereby reducing the height and speed of the electrolyte rebound, and avoiding the electrolyte from flowing back from the positive and negative pressure pipe joints into the pressure pipe, thereby effectively solving the problem of electrolyte backflow in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the device provided by the embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of the front view of the spoiler provided by the embodiment of the utility model;

[0021] Figure 3 It is a top view schematic diagram of a spoiler provided by an embodiment of the utility model;

[0022] Figure 4 It is a bottom view schematic diagram of a spoiler provided by an embodiment of the utility model.

[0023] In the figure: 1-cup body; 11-cavity; 111-first cavity; 112-second cavity; 12-upper pipe joint; 13-lower pipe joint; 14-positive and negative pressure pipe joint; 15-cup wall; 16-upper cup cover; 17-lower cup cover; 2-spoiler; 21-first connecting hole; 22-second connecting hole; 23-third connecting hole; 31-first sealing ring; 32-second sealing ring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Figure 1 It is a schematic diagram of the overall structure of the device provided by the embodiment of the utility model; Figure 2 It is a schematic diagram of the front view of the spoiler provided by the embodiment of the utility model; Figure 3 It is a top view schematic diagram of a spoiler provided by an embodiment of the utility model; Figure 4 Schematic diagram of the spoiler provided by the embodiment of the utility model from above. Figures 1 to 4 The liquid injection device for preventing electrolyte backflow shown in the figure includes: a cup body 1 and a spoiler 2, a cavity 11 is opened inside the cup body 1, an upper pipe joint 12 is arranged on the top of the cup body 1, a lower pipe joint 13 is arranged on the bottom of the cup body 1, and a positive and negative pressure pipe joint 14 is arranged on the side of the cup body 1 close to the top, the upper pipe joint 12, the lower pipe joint 13 and the positive and negative pressure pipe joint 14 are connected with the cavity 11, the spoiler 2 is horizontally arranged in the cavity 11, the spoiler 2 abuts against the inner wall of the cavity 11, a first connecting hole 21 is opened on the top of the spoiler 2, a second connecting hole 22 matching the first connecting hole 21 is opened on the bottom of the spoiler 2, and a third connecting hole 23 is opened on the side of the spoiler 2, the first connecting hole 21 and the second connecting hole 22 are connected through the third connecting hole 23, and the first connecting hole 21 and the second connecting hole 22 are arranged at intervals along the direction of the third connecting hole 23.

[0026] For example, in the embodiment of the utility model, the cross section of the cup body 1 is circular, and the corresponding spoiler 2 is a circular plate. After the lower pipe joint 13 is connected to the injection hole of the battery and sealed and fixed, the electrolyte is injected into the cup body 1 through the upper pipe joint 12, and the positive pressure is applied to the inside of the cavity 11 through the positive and negative pressure pipe joints 14. After a certain period of time, the positive pressure begins to be broken until the negative pressure is formed, and then the negative pressure is broken again, and the positive and negative pressure cycles are continued until the injection is completed. When the pressure is broken, the electrolyte will flow toward the positive and negative pressure pipe joints 14 according to the direction of the pressure breaking. By setting the spoiler 2, when the electrolyte refluxes, it needs to flow through the second connecting hole 22, the third connecting hole 23, and then flow out of the first connecting hole 21 and then flow toward the positive and negative pressure pipe joints 14. Compared with the situation in the prior art where no spoiler is set, after the spoiler 2 is added, the total length of the flow path of the electrolyte during the reflux process is increased, thereby reducing the flow speed of the electrolyte during reflux, thereby playing a role in reflux buffering.

[0027] The embodiment of the utility model provides an injection device for preventing electrolyte backflow, which connects the lower pipe joint 13 with the injection hole of the battery, adds electrolyte from the upper pipe joint 12, and applies positive and negative pressure to the internal circulation of the cavity 11 through the positive and negative pressure pipe joints 14. A spoiler 2 is arranged inside the cup body 1, so that when the pressure is broken, the electrolyte can flow through the second connecting hole 22 and the third connecting hole 23 and flow back to the first connecting hole 21, thereby increasing the flow distance of the electrolyte, thereby reducing the height and speed of the electrolyte rebound, and avoiding the electrolyte from flowing back from the positive and negative pressure pipe joints 14 into the pressure pipe, thereby effectively solving the problem of electrolyte backflow in the prior art.

[0028] Optionally, a plurality of groups of interconnected first connection holes 21 , second connection holes 22 and third connection holes 23 are provided on the spoiler, and the plurality of groups of first connection holes 21 , second connection holes 22 and third connection holes 23 are arranged at equal angles.

[0029] Exemplarily, in an embodiment of the utility model, by providing a plurality of first connection holes 21, a plurality of second connection holes 22 and a plurality of third connection holes 23, the electrolyte can flow more rapidly in the cavity 11 to a position close to the lower pipe joint 13 at the beginning of the injection, thereby increasing the injection efficiency of the injection device.

[0030] Optionally, a plurality of spoilers 2 are provided, and the plurality of spoilers 2 are arranged in parallel and at intervals.

[0031] Exemplarily, in the embodiment of the present invention, by providing a plurality of spoilers 2, the length of the reflux path of the electrolyte during reflux can be further increased, thereby further reducing the flow velocity of the electrolyte during reflux.

[0032] Optionally, the cup body 1 includes a cup wall 15, an upper cup cover 16 and a lower cup cover 17, the upper cup cover 16 is covered on the top of the cup wall 15, and the upper cup cover 16 is detachably connected to the cup wall 15, the lower cup cover 17 is covered on the bottom of the cup wall 15, and the lower cup cover 17 is detachably connected to the cup wall 15, the upper pipe joint 12 is arranged on the upper cup cover 16, and the lower pipe joint 13 is arranged on the lower cup cover 17.

[0033] Illustratively, in an embodiment of the utility model, the cup wall 15 is a cylindrical structure with openings at both ends, and the upper cup cover 16 and the lower cup cover 17 are respectively covered on the top and bottom of the cup wall 15. By configuring the cup body 1 as a separate cup wall 15, upper cup cover 16 and lower cup cover 17 structure, it is more convenient to install the spoiler 2. During the installation process, the spoiler 2 can be first inserted and fixed through the openings at both ends of the cup wall 15, and then the upper cup cover 16 and the lower cup cover 17 are respectively covered on the top and bottom of the cup wall 15, thereby improving the operational convenience of the liquid injection device.

[0034] Optionally, the upper cup cover 16 and the lower cup cover 17 are respectively threadedly connected to the cup wall 15 .

[0035] Illustratively, in the embodiment of the utility model, since positive and negative pressures need to be cyclically applied inside the cup body 1, after the cup body 1 is set into a separate cup wall 15, upper cup cover 16 and lower cup cover 17 structure, the structural strength between the upper cup wall 15, the upper cup cover 16 and the lower cup cover 17 needs to be considered. By threading the upper cup cover 16 and the lower cup cover 17 to the cup wall 15 respectively, the cup wall 15, the upper cup cover 16 and the lower cup cover 17 have a certain structural strength, and the upper cup cover 16 and the lower cup cover 17 are also convenient to disassemble, thereby improving the stability of the liquid injection device and further improving the operation convenience of the liquid injection device.

[0036] Optionally, a first sealing ring 31 is provided between the upper cup cover 16 , the lower cup cover 17 and the cup wall 15 , a second sealing ring 32 is provided between the upper pipe joint 12 and the upper cup cover 16 , and a second sealing ring 32 is provided between the lower pipe joint 13 and the lower cup cover 17 .

[0037] Exemplarily, in the embodiment of the utility model, by providing a first sealing ring 31 between the upper cup cover 16 and the cup wall 15, and providing a first sealing ring 31 between the lower cup cover 17 and the cup wall 15, the sealing performance between the upper cup cover 16 and the lower cup cover 17 and the cup wall 15 can be improved. By providing a second sealing ring 32 between the upper pipe joint 12 and the upper cup cover 16, and providing a second sealing ring 32 between the lower pipe joint 13 and the lower cup cover 17, the sealing performance between the upper pipe joint 12 and the lower pipe joint 13 and the cup wall 15 can be improved. In the process of injecting electrolyte, it is necessary to keep the inside of the cavity 11 in a sealed state. By providing the first sealing ring 31 and the second sealing ring 32, the sealing performance of the liquid injection device is improved.

[0038] Optionally, the cavity 11 includes a first inner cavity 111 and a second inner cavity 112 that are interconnected, the inner diameters of the first inner cavity 111 and the second inner cavity 112 are different, and the spoiler 2 is installed at the junction of the first inner cavity 111 and the second inner cavity 112 .

[0039] For example, in the embodiment of the utility model, the first inner cavity 111 and the second inner cavity 112 form a step shape, the spoiler 2 is installed on the step, the spoiler 2 is limited by the step, so that the spoiler 2 can be accurately positioned at the position where it needs to be installed, and then the spoiler 2 is fixed to the step, that is, the installation of the spoiler 2 is completed. When multiple spoilers 2 are provided, multiple spoilers 2 can be quickly positioned and installed at the set position, thereby further improving the convenience of operation of the liquid injection device.

[0040] Optionally, the spoiler 2 is made of stainless steel.

[0041] For example, in the embodiment of the utility model, the spoiler 2 is made of 316 stainless steel. The corrosion resistance and high temperature strength of 316 stainless steel are greatly improved by adding Mo element. The high temperature resistance can reach 1200-1300 degrees, and it can be used under harsh conditions. By setting the spoiler 2 as a stainless steel part, the service life of the liquid injection device is improved.

[0042] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the utility model belongs. The words "first", "second" and similar words used in the specification and claims of the utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] The above description is only an optional embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A liquid injection device for preventing electrolyte backflow, characterized in that: include: cup body (1) and spoiler (2), A cavity (11) is provided inside the cup body (1); an upper pipe joint (12) is provided at the top of the cup body (1); a lower pipe joint (13) is provided at the bottom of the cup body (1); a positive and negative pressure pipe joint (14) is provided on one side of the cup body (1) close to the top; the upper pipe joint (12), the lower pipe joint (13) and the positive and negative pressure pipe joint (14) are in communication with the cavity (11); The spoiler (2) is horizontally arranged in the cavity (11), the spoiler (2) abuts against the inner wall of the cavity (11), a first connecting hole (21) is provided at the top of the spoiler (2), a second connecting hole (22) matching the first connecting hole (21) is provided at the bottom of the spoiler (2), a third connecting hole (23) is provided on the side of the spoiler (2), the first connecting hole (21) and the second connecting hole (22) are connected through the third connecting hole (23), and the first connecting hole (21) and the second connecting hole (22) are arranged at intervals along the direction of the third connecting hole (23).

2. The electrolyte backflow prevention liquid injection device according to claim 1, characterized in that: The spoiler is provided with a plurality of groups of the first connecting holes (21), the second connecting holes (22) and the third connecting holes (23) which are interconnected, and the plurality of groups of the first connecting holes (21), the second connecting holes (22) and the third connecting holes (23) are arranged at equal angles.

3. The liquid injection device for preventing electrolyte backflow according to claim 1, characterized in that: A plurality of spoilers (2) are provided, and the plurality of spoilers (2) are arranged in parallel and at intervals.

4. The electrolyte backflow prevention liquid injection device according to claim 1, characterized in that: The cup body (1) comprises a cup wall (15), an upper cup cover (16) and a lower cup cover (17); the upper cup cover (16) is arranged on the top of the cup wall (15), and the upper cup cover (16) is detachably connected to the cup wall (15); the lower cup cover (17) is arranged on the bottom of the cup wall (15), and the lower cup cover (17) is detachably connected to the cup wall (15); the upper pipe joint (12) is arranged on the upper cup cover (16), and the lower pipe joint (13) is arranged on the lower cup cover (17).

5. The electrolyte backflow prevention liquid injection device according to claim 4, characterized in that: The upper cup cover (16) and the lower cup cover (17) are respectively threadedly connected to the cup wall (15).

6. The electrolyte backflow prevention liquid injection device according to claim 4, characterized in that: A first sealing ring (31) is arranged between the upper cup cover (16), the lower cup cover (17) and the cup wall (15), a second sealing ring (32) is arranged between the upper pipe joint (12) and the upper cup cover (16), and a second sealing ring (32) is arranged between the lower pipe joint (13) and the lower cup cover (17).

7. The electrolyte backflow prevention liquid injection device according to claim 4, characterized in that: The cavity (11) comprises a first inner cavity (111) and a second inner cavity (112) which are interconnected, the inner diameters of the first inner cavity (111) and the second inner cavity (112) are different, and the spoiler (2) is installed at the junction of the first inner cavity (111) and the second inner cavity (112).

8. The electrolyte backflow prevention liquid injection device according to claim 1, characterized in that: The spoiler (2) is a stainless steel part.

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