Automatic supplement device for secondary injection of lithium ion battery

Abstract

The application relates to a lithium ion battery secondary liquid injection automatic supplementing device, which comprises a rotating table and a servo motor for driving the rotating table to rotate, a plurality of limiting grooves are arranged on the rotating table in the circumferential direction, the limiting grooves are used for arranging battery groups, a supporting frame is arranged on the outer side surface of the rotating table, a liquid injection tank is arranged on the supporting frame, a lifting assembly and a liquid injection assembly driven by the lifting assembly are arranged on the supporting frame, the liquid injection assembly is slidingly arranged at the lower end of the liquid injection tank, a plugging assembly is arranged at the lower end of the liquid injection assembly, the lifting assembly is used for driving the liquid injection assembly to move downwards and extend into the liquid injection hole of the battery group, the plugging assembly is driven to stop liquid injection when the electrolyte in the battery group rises to a fixed level, electrolyte with different liquid levels can be supplemented, and the required liquid level can be reached.

Description

Technical Field

[0001] This invention relates to the field of liquid injection machine technology, specifically to an automatic replenishment device for secondary liquid injection of lithium-ion batteries. Background Technology

[0002] After the first electrolyte injection, lithium-ion batteries undergo high-temperature static immersion and formation. The SEI film formation stage consumes electrolyte, and the formation produces byproduct gases such as carbon dioxide and alkanes. When the negative pressure is vented, some electrolyte vapor and free electrolyte are carried away simultaneously. If the total amount of electrolyte inside the cell is insufficient, a second electrolyte injection is required.

[0003] A Chinese invention patent with publication number CN119340627B discloses a rotary secondary liquid injection machine for square aluminum-shell lithium batteries, including an injection frame, a programmable controller and a motor fixedly installed on the injection frame, a bearing shaft installed on the motor, a bearing turntable fixedly installed on the bearing shaft, a movable connecting hole opened on the circumference of the bearing turntable, and a mating protrusion fixedly installed on the circumference of the bearing turntable, with a support insertion hole opened on the mating protrusion and the support insertion hole penetrating into the bearing turntable, a bearing plate frame fixedly installed at one end of the injection frame, and a mating channel opened at the upper end of the bearing plate frame.

[0004] However, the inventors discovered that in the actual use of the above device, because it is impossible to determine the amount of electrolyte in the battery pack, it is also impossible to inject a fixed amount into the battery pack quantitatively. Based on this, we proposed an automatic replenishment device for secondary electrolyte injection of lithium-ion batteries. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a rotating platform with several limiting grooves along its circumference for accommodating the battery pack. A support frame is provided on the outer side of the rotating platform, and a liquid injection tank is mounted on the support frame. A lifting assembly and a liquid injection assembly driven by the lifting assembly are also mounted on the support frame. The liquid injection assembly is slidably positioned at the lower end of the liquid injection tank, and a blocking assembly is located at the lower end of the liquid injection assembly. In this invention, the lifting assembly drives the liquid injection assembly to move downwards and extend into the liquid injection hole of the battery pack. When the electrolyte level in the battery pack rises to a fixed level, the blocking assembly is driven to stop the liquid injection. This allows for replenishment of electrolyte at different liquid levels to achieve the desired liquid level.

[0006] To address the aforementioned technical problems, the present invention adopts the following technical solution:

[0007] An automatic secondary electrolyte replenishment device for lithium-ion batteries includes a turntable and a servo motor for driving the turntable to rotate. The turntable has several limiting grooves along its circumference for accommodating battery packs. A support frame is provided on the outer side of the turntable, and an electrolyte filling tank is mounted on the support frame. A lifting assembly and an electrolyte filling assembly driven by the lifting assembly are also mounted on the support frame. The electrolyte filling assembly is slidably disposed at the lower end of the electrolyte filling tank, and a blocking assembly is provided at the lower end of the electrolyte filling assembly. The lifting assembly drives the electrolyte filling assembly to move downwards and extend into the electrolyte filling hole of the battery pack. When the electrolyte level in the battery pack rises to a fixed level, the blocking assembly is driven to stop the electrolyte filling.

[0008] As a preferred embodiment, the lifting assembly includes a sub-bracket mounted on a support frame, a slide groove mounted on the sub-bracket, a lead screw rotatably mounted within the slide groove, and a first motor for driving the lead screw to rotate.

[0009] As a preferred embodiment, the injection assembly includes a fixed pipe disposed at the lower end of the injection tank, an injection tube slidably disposed within the fixed pipe, a sliding groove disposed within the fixed pipe, and a slider disposed at the end of the injection tube.

[0010] As a preferred embodiment, a limiting block is provided on the injection tube, and the limiting block is rotatably mounted on the lead screw.

[0011] As a preferred embodiment, the blocking assembly includes an arc-shaped groove disposed at the lower end of the injection tube, a return spring disposed at the lower end of the arc-shaped groove, and a buoyancy ball disposed on the return spring.

[0012] As a preferred embodiment, the arc-shaped groove is configured such that the diameter at the middle part is larger than the diameter at the top and bottom ends, and the arc-shaped groove includes an upper arc and a lower arc, wherein the path of the upper arc is longer than the path of the lower arc.

[0013] As a preferred embodiment, the injection tube is provided with a first baffle plate and a second baffle plate, wherein the injection hole diameter of the first baffle plate is larger than that of the second baffle plate.

[0014] As another preferred embodiment, the buoyancy ball is filled with nitrogen or carbon dioxide gas, and the outer surface of the buoyancy ball is provided with a layer of silicone.

[0015] The beneficial effects of this invention are:

[0016] In this invention, the electrolyte is injected by inserting the injection tube into the injection hole of the battery pack. As the electrolyte begins to rise, the buoyancy ball rises along with the liquid level, thereby blocking the injection port of the injection tube and making the electrolyte level reach the standard height. The electrolyte can be replenished for different liquid levels to reach the required liquid level.

[0017] In this invention, a layer of silicone is provided on the outer surface of the buoyancy ball, which can better contact the inner wall of the injection tube, preventing the electrolyte from flowing out from the inner wall of the buoyancy ball and the injection tube, and ensuring that the electrolyte in the battery pack is within the standard height.

[0018] In summary, this equipment has the advantages of high liquid injection efficiency and automatic liquid injection for different liquid levels, making it particularly suitable for the field of liquid injection machine technology. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used 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 those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the isometric structure of an automatic secondary electrolyte replenishment device for lithium-ion batteries;

[0021] Figure 2 This is an isometric structural diagram of the support frame;

[0022] Figure 3 for Figure 2 Enlarged structural diagram of section A;

[0023] Figure 4 This is a cross-sectional structural diagram of the lifting assembly;

[0024] Figure 5 This is a schematic cross-sectional view of the injection assembly.

[0025] Figure 6 for Figure 5 Enlarged structural diagram of section B;

[0026] Figure 7 This is a schematic cross-sectional view of the blocking component;

[0027] In the diagram: 1-Turntable; 2-Servo motor; 3-Limit groove; 4-Battery pack; 5-Support frame; 6-Injection tank; 7-Lifting assembly; 8-Injection assembly; 9-Blocking assembly; 71-Secondary support; 72-Slide groove; 73-Lead screw; 74-First motor; 81-Fixed pipe; 82-Injection pipe; 83-Slide groove; 84-Slider; 85-Limit block; 91-Arc groove; 92-Reset spring; 93-Buoyancy ball; 821-First baffle; 822-Second baffle; 911-Upper arc; 912-Lower arc. Detailed Implementation

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0029] Example 1

[0030] like Figures 1 to 7 As shown, an automatic secondary electrolyte replenishment device for lithium-ion batteries includes a turntable 1 and a servo motor 2 for driving the turntable 1 to rotate. The turntable 1 has several limiting grooves 3 arranged along the circumferential direction. The limiting grooves 3 are used to place the battery pack 4. A support frame 5 is arranged on the outer side of the turntable 1. An electrolyte filling tank 6 is arranged on the support frame 5. A lifting component 7 and an electrolyte filling component 8 driven by the lifting component 7 are arranged on the support frame 5. The electrolyte filling component 8 is slidably arranged at the lower end of the electrolyte filling tank 6. A blocking component 9 is arranged at the lower end of the electrolyte filling component 8. The lifting component 7 is used to drive the electrolyte filling component 8 to move down and extend into the electrolyte filling hole of the battery pack 4. When the electrolyte in the battery pack 4 rises to a fixed level, the blocking component 9 is driven to stop the electrolyte filling.

[0031] In this embodiment, as Figures 3 to 4 As shown, the lifting assembly 7 includes a sub-bracket 71 mounted on the support frame 5, a slide groove 72 mounted on the sub-bracket 71, a lead screw 73 rotatably mounted in the slide groove 72, and a first motor 74 for driving the lead screw 73 to rotate. In this invention, the first motor 74 drives the lead screw 73 to rotate, and the limiting block 85 is limited in the slide groove 72, thereby driving the injection tube 82 to move up and down.

[0032] In addition, such as Figure 6 As shown, the injection assembly 8 includes a fixed pipe 81 disposed at the lower end of the injection tank 6, an injection tube 82 slidably disposed within the fixed pipe 81, a sliding groove 83 disposed within the fixed pipe 81, and a slider 84 disposed at the end of the injection tube 82; a limiting block 85 is disposed on the injection tube 82, and the limiting block 85 is rotatably disposed on the lead screw 73; in this invention, the slider 84 moves within the sliding groove 83, and the sliding groove 83 limits the upper and lower ends of the slider 84.

[0033] It is worth mentioning that a valve is also provided at the lower end of the injection tube 82. After the injection is completed, the valve is closed, and after the injection tube 82 is inserted into the injection hole, the valve is opened to allow the injection tube 82 to flow.

[0034] Furthermore, such as Figure 7As shown, the blocking component 9 includes an arc-shaped groove 91 at the lower end of the injection tube 82, a return spring 92 at the lower end of the arc-shaped groove 91, and a buoyancy ball 93 on the return spring 92. The buoyancy ball 93 is filled with nitrogen or carbon dioxide gas, and a layer of silicone is provided on the outer surface of the buoyancy ball 93. In this invention, the injection tube 82 is inserted into the injection hole of the battery pack 4 to start injecting electrolyte. When the electrolyte begins to rise, the buoyancy ball 93 rises along with the liquid level, thereby blocking the injection port of the injection tube 82 and making the electrolyte level reach the standard height. When the buoyancy ball 93 abuts against the arc-shaped groove 91, the contact sensor provided in the arc-shaped groove 91 transmits a signal to the control terminal.

[0035] It is worth mentioning that the outer surface of the buoyancy ball 93 is provided with a layer of silicone, which can better contact the inner wall of the injection tube 82 and prevent the electrolyte from flowing out from the inner wall of the buoyancy ball 93 and the injection tube 82.

[0036] It needs to be emphasized that, such as Figure 7 As shown, the arc-shaped groove 91 is configured such that the diameter at the middle part is larger than the diameter at the top and bottom ends. The arc-shaped groove 91 includes an upper arc 911 and a lower arc 912, and the path of the upper arc 911 is longer than the path of the lower arc 912. In this invention, a reset spring 92 is set between the buoyancy ball 93 and the arc-shaped groove 91 to prevent the buoyancy ball 93 from contacting the lower arc 912, thus preventing the problem of uneven liquid discharge. The upper arc 911 has a longer path, which allows for more precise control of the required liquid level height during the slow ascent of the buoyancy ball 93.

[0037] Furthermore, such as Figure 7 As shown, the injection tube 82 is provided with a first baffle plate 821 and a second baffle plate 822. The injection hole diameter of the first baffle plate 821 is larger than that of the second baffle plate 822. In this invention, the flow rate of the electrolyte can be reduced by the blocking effect of the first baffle plate 821 and the second baffle plate 822.

[0038] Work process

[0039] Start the servo motor 2 to drive the turntable 1 to rotate, causing the battery pack 4 to stop at the lower end of the injection tank 6;

[0040] The first motor 74 is started, driving the lead screw 73 to rotate. The limit block 85 is limited in the slide groove 72, thereby driving the injection pipe 82 to move downward. The injection pipe 82 is inserted into the injection hole of the battery pack 4 to start injecting electrolyte. When the electrolyte starts to rise, the buoyancy ball 93 rises with the liquid level, thereby blocking the injection port of the injection pipe 82 and making the liquid level of the electrolyte reach the standard height. When the buoyancy ball 93 abuts against the arc groove 91, the contact sensor set in the arc groove 91 transmits a signal to the control terminal. The control terminal closes the valve and starts the first motor 74, driving the injection pipe 82 to move upward.

[0041] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An automatic refill device for lithium-ion batteries, comprising a turntable (1) and a servo motor (2) for driving the turntable (1) to rotate, characterized in that: The turntable (1) is provided with several limiting grooves (3) along the circumferential direction. The limiting grooves (3) are used to place the battery pack (4). The outer side of the turntable (1) is provided with a support frame (5). The support frame (5) is provided with an injection tank (6). The support frame (5) is provided with a lifting component (7) and an injection component (8) driven by the lifting component (7). The injection component (8) is slidably disposed at the lower end of the injection tank (6). The lower end of the injection component (8) is provided with a blocking component (9). The lifting component (7) is used to drive the injection component (8) to move down and extend into the injection hole of the battery pack (4). When the electrolyte in the battery pack (4) rises to a fixed level, the blocking component (9) is driven to stop the injection.

2. The automatic secondary electrolyte replenishment device for lithium-ion batteries according to claim 1, characterized in that, The lifting assembly (7) includes a sub-bracket (71) mounted on the support frame (5), a slide groove (72) mounted on the sub-bracket (71), a lead screw (73) rotatably mounted in the slide groove (72), and a first motor (74) for driving the lead screw (73) to rotate.

3. The automatic secondary electrolyte replenishment device for lithium-ion batteries according to claim 1, characterized in that, The injection assembly (8) includes a fixed pipe (81) disposed at the lower end of the injection tank (6), an injection tube (82) slidably disposed in the fixed pipe (81), a sliding groove (83) disposed in the fixed pipe (81), and a slider (84) disposed at the end of the injection tube (82).

4. The automatic secondary electrolyte replenishment device for lithium-ion batteries according to claim 3, characterized in that, A limiting block (85) is provided on the injection tube (82), and the limiting block (85) is rotatably mounted on the lead screw (73).

5. The automatic secondary electrolyte replenishment device for lithium-ion batteries according to claim 1, characterized in that, The blocking assembly (9) includes an arc-shaped groove (91) disposed at the lower end of the injection tube (82), a return spring (92) disposed at the lower end of the arc-shaped groove (91), and a buoyancy ball (93) disposed on the return spring (92).

6. The automatic secondary electrolyte replenishment device for lithium-ion batteries according to claim 5, characterized in that, The arc groove (91) is configured such that the diameter at the middle part is greater than the diameter at the top and bottom ends. The arc groove (91) includes an upper arc (911) and a lower arc (912), and the path of the upper arc (911) is greater than the path of the lower arc (912).

7. The automatic secondary electrolyte replenishment device for lithium-ion batteries according to claim 3, characterized in that, The injection tube (82) is provided with a first baffle plate (821) and a second baffle plate (822), and the injection hole diameter of the first baffle plate (821) is larger than that of the second baffle plate (822).

8. The automatic secondary electrolyte replenishment device for lithium-ion batteries according to claim 5, characterized in that, The buoyancy ball (93) is filled with nitrogen or carbon dioxide gas, and a layer of silicone is provided on the outer surface of the buoyancy ball (93).

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