Battery liquid injection device and battery liquid injection method

Abstract

The present application relates to battery liquid injection technical field, especially battery liquid injection device and battery liquid injection method, battery includes first liquid injection hole and second liquid injection hole, first liquid injection hole and second liquid injection hole are all communicated with battery interior;Battery liquid injection device includes liquid injection component and liquid storage component;Liquid injection component is connected with battery, and there is liquid injection channel in liquid injection component, and both ends of liquid injection channel have liquid injection opening, and liquid injection channel is communicated with first liquid injection hole through liquid injection opening;When liquid injection is carried out, electrolyte is injected into battery through liquid injection channel and first liquid injection hole;Liquid storage component is connected with battery, and liquid storage space is formed in liquid storage component, and first liquid storage hole is arranged on liquid storage component, and liquid storage space is communicated with second liquid injection hole through first liquid storage hole;When liquid injection, electrolyte is overflowed into liquid storage space through second liquid injection hole and first liquid storage hole, and when liquid injection is stopped, electrolyte is entered into battery through first liquid storage hole and second liquid injection hole.The present application has high production efficiency, low cost, less electrolyte loss and good infiltration effect.

Description

Technical Field

[0001] This invention relates to the field of battery electrolyte filling technology, and more particularly to battery electrolyte filling apparatus and battery electrolyte filling method. Background Technology

[0002] In recent years, the market share of new energy vehicles has been increasing year by year. As the main power source for new energy vehicles, the demand for lithium batteries is growing daily, and people are also placing higher demands on their various performance characteristics.

[0003] In lithium-ion batteries, the electrolyte is a crucial medium for ensuring ion transport. The effectiveness of the electrolyte's wetting effect directly impacts battery performance. The electrolyte injection process, as a key step in battery manufacturing, significantly influences the wetting effect of the electrolyte.

[0004] In current battery production processes, to achieve good electrolyte wetting, multiple electrolyte injections are often required during the electrolyte filling process, through injection holes on the battery top cover. These multiple injections increase process time, impact production efficiency, and raise production costs. Furthermore, since the injection holes are often flush with the top cover, electrolyte overflows from these holes if it cannot be properly wetted during the injection process, resulting in electrolyte loss. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the low battery production efficiency, high production cost, and electrolyte loss caused by the prior art in order to ensure the wettability of the electrolyte. The present invention provides a battery electrolyte injection device and battery electrolyte injection method that has high production efficiency, low production cost, less electrolyte loss, and good electrolyte wettability.

[0006] This invention provides a battery electrolyte injection device for injecting electrolyte into a battery. The battery includes a first injection port and a second injection port, both of which are in communication with the interior of the battery. The battery electrolyte injection device includes an injection component detachably connected to the battery. An injection channel is formed within the injection component, and injection openings are provided at both ends of the injection channel. The injection channel communicates with the first injection port through the injection openings. During electrolyte injection, the electrolyte flows sequentially through the injection channel and... The first injection port injects electrolyte into the interior of the battery; a liquid storage component is detachably connected to the battery, the liquid storage component forms a liquid storage space, and a first liquid storage port is provided on the liquid storage component. The liquid storage space is connected to the second injection port through the first liquid storage port; when liquid injection is performed, the electrolyte overflows into the liquid storage space through the second injection port and the first liquid storage port in sequence; when liquid injection is stopped, the electrolyte in the liquid storage space enters the interior of the battery through the first liquid storage port and the second injection port in sequence.

[0007] In one embodiment of the present invention, the area of ​​the injection opening is not less than the area of ​​the first injection hole, the area of ​​the first storage hole is not less than the area of ​​the second injection hole, and the area of ​​the injection opening is less than the area of ​​the first storage hole.

[0008] In one embodiment of the present invention, the area of ​​the injection opening is S1, and the area of ​​the first storage hole is S2, satisfying the relationship: S1=K*S2, where the value of K ranges from 0.4 to 0.8.

[0009] In one embodiment of the present invention, the liquid storage component is configured as a liquid storage tube, and the inner wall of the liquid storage tube is inclined such that the diameter of the first liquid storage hole gradually decreases from one end to the end connected to the battery.

[0010] In one embodiment of the present invention, a first mounting component is provided, which is connected to the battery. The first mounting component has a first through hole that communicates with the first injection hole. The injection component is coaxially inserted into the first through hole and connected to the first mounting component. When injection is performed, the electrolyte is injected into the battery through the injection channel and the first injection hole in sequence.

[0011] In one embodiment of the present invention, the first mounting component has a first mounting groove formed outside the first through hole, and the first mounting groove is used to mount the liquid injection component.

[0012] In one embodiment of the present invention, the injection component is provided with a second mounting groove on the outside of the injection channel. When the injection component is connected to the first mounting component, the first mounting groove and the second mounting groove engage to form a sealing structure.

[0013] In one embodiment of the present invention, a second mounting component is further included. The second mounting component is connected to the battery, and a second through hole is provided on the second mounting component, which communicates with the second liquid injection hole. The liquid storage component is coaxially inserted into the second through hole and connected to the second mounting component. When liquid is injected, the electrolyte overflows into the liquid storage space through the second liquid injection hole and the first liquid storage hole in sequence. When liquid injection is stopped, the electrolyte in the liquid storage space enters the interior of the battery through the first liquid storage hole and the second liquid injection hole in sequence.

[0014] In one embodiment of the present invention, the second mounting component has a third mounting groove formed outside the second through hole, the third mounting groove being used to mount the liquid storage component.

[0015] In one embodiment of the present invention, the liquid storage component has a fourth mounting groove formed on the outside of the first liquid storage hole. When the liquid storage component is connected to the second mounting component, the third mounting groove and the fourth mounting groove engage to form a sealing structure.

[0016] The present invention also provides a battery electrolyte injection method based on the battery electrolyte injection device described in any one of the above claims, comprising the following steps:

[0017] S1. Inject the electrolyte into the battery through the injection channel and the first injection hole until the electrolyte overflows into the storage space and fills the electrolyte, then stop the injection.

[0018] S2. Let stand until all the electrolyte in the storage space has entered the battery.

[0019] Compared with the prior art, the above-described technical solution of the present invention has the following advantages:

[0020] The battery electrolyte injection device of this invention increases the amount of electrolyte injected in a single injection process by incorporating a storage component. Because the amount of electrolyte injected in one go is increased, the number of injection cycles is reduced to achieve the same amount of electrolyte injected. On the one hand, this eliminates the need for repeated injection and settling processes, simplifying the production process; on the other hand, it shortens production time, improves production efficiency, and reduces manufacturing costs. Simultaneously, the storage component effectively stores electrolyte overflowing during the injection process, effectively reducing electrolyte loss and waste, further lowering manufacturing costs. Furthermore, after the electrolyte inside the battery is consumed, the electrolyte in the storage space enters the battery interior to wet the battery cells, resulting in excellent wetting effects. Attached Figure Description

[0021] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0022] Figure 1 This is a schematic diagram of the top cover in a preferred embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the liquid injection component in a preferred embodiment of the present invention;

[0024] Figure 3 This is one of the cross-sectional structural schematic diagrams of the injection component in a preferred embodiment of the present invention;

[0025] Figure 4 This is one of the cross-sectional structural schematic diagrams of the liquid storage component in a preferred embodiment of the present invention;

[0026] Figure 5 This is one of the structural schematic diagrams of the battery liquid injection device in a preferred embodiment of the present invention;

[0027] Figure 6 for Figure 5 A cross-sectional view of the battery electrolyte injection device shown.

[0028] Figure 7 This is one of the schematic diagrams of electrolyte flow in the battery injection device according to a preferred embodiment of the present invention;

[0029] Figure 8 This is a second schematic diagram of electrolyte flow in a preferred embodiment of the battery injection device of the present invention;

[0030] Figure 9 This is the third schematic diagram of electrolyte flow in the battery injection device according to a preferred embodiment of the present invention;

[0031] Figure 10 This is a cross-sectional view of the battery electrolyte filling device in a preferred embodiment of the present invention;

[0032] Figure 11 This is a second cross-sectional view of the liquid storage component in a preferred embodiment of the present invention;

[0033] Figure 12 This is one of the cross-sectional structural schematic diagrams of the first mounting component and the second mounting component in a preferred embodiment of the present invention;

[0034] Figure 13 This is a second cross-sectional view of the battery liquid injection device in a preferred embodiment of the present invention;

[0035] Figure 14 This is a second cross-sectional view of the first mounting component and the second mounting component in a preferred embodiment of the present invention;

[0036] Figure 15 This is the third cross-sectional view of the battery liquid injection device in a preferred embodiment of the present invention;

[0037] Figure 16 This is a cross-sectional view of the first sealing component in a preferred embodiment of the present invention;

[0038] Figure 17 This is the third cross-sectional structural schematic diagram of the liquid storage component in a preferred embodiment of the present invention;

[0039] Figure 18 This is a cross-sectional view of the second sealing component in a preferred embodiment of the present invention;

[0040] Figure 19 This is a second cross-sectional view of the injection component in a preferred embodiment of the present invention;

[0041] Figure 20 This is the fourth cross-sectional structural schematic diagram of the liquid storage component in a preferred embodiment of the present invention;

[0042] Figure 21 This is the fourth cross-sectional view of the battery liquid injection device in a preferred embodiment of the present invention.

[0043] Explanation of reference numerals in the accompanying drawings: 11, Top cover; 111, First injection hole; 112, Second injection hole; 20, Injection component; 21, Injection channel; 22, Injection opening; 23, Second mounting groove; 30, Storage component; 31, Storage space; 32, First storage hole; 33, Second storage hole; 34, Fourth mounting groove; 40, First mounting component; 41, First through hole; 42, First mounting groove; 50, Second mounting component; 51, Second through hole; 52, Third mounting groove; 61, First sealing component; 62, Second sealing component. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0045] This invention discloses a battery electrolyte injection device for injecting electrolyte into a battery. (See reference...) Figure 1 As shown, the battery includes a first injection hole 111 and a second injection hole 112, both of which are connected to the interior of the battery.

[0046] The battery electrolyte filling device includes an electrolyte filling component 20 and an electrolyte storage component 30.

[0047] Reference Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the electrolyte injection component 20 is detachably connected to the battery, allowing it to be removed after electrolyte injection for subsequent processes. Those skilled in the art can select the specific detachable connection method, such as threaded connection or snap-fit, according to actual needs. An electrolyte injection channel 21 is formed within the electrolyte injection component 20, with electrolyte injection openings 22 at both ends. The electrolyte injection channel 21 communicates with the first electrolyte injection hole 111 through the electrolyte injection openings 22. During electrolyte injection, the electrolyte is injected into the battery sequentially through the electrolyte injection channel 21 and the first electrolyte injection hole 111. Those skilled in the art can select a specific electrolyte injection component 20, such as an injection tube or an injection head, according to actual needs.

[0048] Reference Figure 4 , Figure 5 and Figure 6 As shown, the electrolyte storage component 30 is detachably connected to the battery, allowing it to be removed after electrolyte injection for subsequent processes. Those skilled in the art can select the specific detachable connection method, such as threaded connection or snap-fit, according to actual needs. The electrolyte storage component 30 has a storage space 31 for storing electrolyte that overflows from the battery during the injection process. A first storage hole 32 is provided on the electrolyte storage component 30, and the storage space 31 is connected to the second injection hole 112 through the first storage hole 32. Those skilled in the art can select a specific electrolyte storage component 30, such as a storage tube, according to actual needs; and can adjust the volume of the storage space 31 to meet different electrolyte injection requirements.

[0049] During electrolyte injection, the electrolyte is first injected into the battery through the injection channel 21 and the first injection hole 111. When the amount of electrolyte inside the battery exceeds the battery's electrolyte storage capacity, the electrolyte overflows into the storage space 31 through the second injection hole 112 and the first storage hole 32. After the injection process stops, the electrolyte inside the battery is consumed as the cells become wetted. The electrolyte in the storage space 31 then enters the battery through the first storage hole 32 and the second injection hole 112.

[0050] The battery electrolyte injection device of this invention increases the amount of electrolyte injected in a single injection process by incorporating a storage component 30. Because the amount of electrolyte injected in a single operation is increased, the number of injection cycles is reduced to achieve the same amount of electrolyte injected. On one hand, this eliminates the need for repeated injection and settling processes, simplifying the production process; on the other hand, it shortens production time, improves production efficiency, and reduces manufacturing costs. Simultaneously, the storage component 30 effectively stores electrolyte overflowing during the injection process, effectively reducing electrolyte loss and waste, further lowering manufacturing costs. Furthermore, after the electrolyte inside the battery is consumed, the electrolyte in the storage space 31 enters the battery interior to wet the battery cells, resulting in excellent wetting effects.

[0051] Those skilled in the art can select the battery shape and size, such as a prismatic battery or a cylindrical battery, according to actual needs. The positions of the first injection hole 111 and the second injection hole 112 can both be set according to actual needs. Taking a prismatic battery as an example, they can be located between the battery terminal and the explosion-proof valve, or in other positions on the top cover 11, as long as they are not blocked by internal cell structures such as the Mylar membrane. Preferably, the positions of the first injection hole 111 and the second injection hole 112 are both located on the top cover 11 of the battery. On the one hand, this facilitates assembly and injection processes during production, improving production efficiency; on the other hand, it allows for cooperation with the injection component 20 and the storage component 30, further improving the electrolyte wetting effect and ensuring that the entire cell is well wetted. Specifically, during injection, refer to... Figure 7 As shown, the electrolyte flows into the battery from the first injection hole 111, i.e., above the cell. Then refer to... Figure 8 As shown, the electrolyte circulates from top to bottom and then from bottom to top, ensuring thorough wetting of the entire cell. When the amount of electrolyte inside the battery exceeds its storage capacity, electrolyte enters the reservoir 30. After electrolyte injection stops, the electrolyte inside the battery is consumed as the cell is further wetted. (Refer to...) Figure 9 As shown, the electrolyte in the storage space 31 enters the interior of the battery, and the cell is once again wetted by the electrolyte from top to bottom.

[0052] Reference Figure 10 As shown, in some embodiments of the battery electrolyte injection device of the present invention, the area of ​​the injection opening 22 is not less than the area of ​​the first injection hole 111, the area of ​​the first storage hole 32 is not less than the area of ​​the second injection hole 112, and the area of ​​the injection opening 22 is less than the area of ​​the first storage hole 32. By limiting the areas of the injection opening 22 and the first storage hole 32, it is possible to avoid the electrolyte overflowing from the gap between the corresponding component and the injection hole during the injection process and to prevent external impurities from entering the battery; it fully ensures the high injection efficiency of the injection component 20 and the high storage efficiency and high injection efficiency of the storage component 30, thereby further shortening the production time and improving the production efficiency. On this basis, further limiting the area of ​​the injection opening 22 to be less than the area of ​​the first storage hole 32 can effectively amplify the injection pressure and improve the wetting effect of the electrolyte. Preferably, both the injection component 20 and the storage component 30 are configured as tubular structures. Taking the tubular injection component 20 and storage component 30 as examples, F1 = p1 * S1 and F2 = p2 * S2, where F1 represents the force exerted by the electrolyte on the injection component 20, F2 represents the force exerted by the electrolyte on the storage component 30, p1 represents the pressure of the electrolyte in the injection component 20, p2 represents the pressure of the electrolyte in the storage component 30, S1 represents the area of ​​the injection opening 22, and S2 represents the area of ​​the first storage hole 32. According to Pascal's principle, when the area of ​​the injection opening 22 is smaller than the area of ​​the first storage hole 32, that is, when the inner diameter of the injection component 20 is relatively smaller than the inner diameter of the storage component 30, the pressure generated when injecting electrolyte from the injection component 20 can be effectively amplified. This allows the electrolyte to be pushed and wetted into the dead corners inside the battery cell under pressure before entering the storage component 30, thereby improving the wetting effect of the electrolyte.

[0053] Furthermore, in some embodiments of the battery electrolyte injection device of the present invention, the area of ​​the injection opening 22 is S1, and the area of ​​the first electrolyte storage hole 32 is S2, satisfying the relationship: S1 = K * S2, where the value of K ranges from 0.4 to 0.8. When the value of K is less than 0.4, the area of ​​the injection opening 22 is too small, making it difficult to guarantee the injection efficiency; when the value of K is greater than 0.8, it is difficult to guarantee the wetting effect of the electrolyte. When the value of K is between 0.4 and 0.8, both the wetting effect of the electrolyte and the injection efficiency can be balanced. Specific values ​​of K can be selected according to actual needs, such as 0.4, 0.5, 0.6, 0.7, 0.8, etc., which will not be elaborated further.

[0054] Reference Figure 11 As shown, in some embodiments of the battery electrolyte filling device of the present invention, the electrolyte storage component 30 is configured as a electrolyte storage tube, and the inner wall of the electrolyte storage tube is inclined, so that the diameter of the first electrolyte storage hole 32 gradually decreases from one end to the end connected to the battery. By setting the electrolyte storage component 30 with this structure, it is possible to facilitate the rapid entry of electrolyte into the battery, thereby shortening the production time and improving production efficiency.

[0055] Reference Figure 12 and Figure 13 As shown, in some embodiments of the battery electrolyte injection device of the present invention, a first mounting component 40 is further included, which is connected to the battery. Preferably, the first mounting component 40 is disposed outside the battery to facilitate removal of the first mounting component 40 after electrolyte injection for subsequent processes. The first mounting component 40 has a first through hole 41, which communicates with the first injection hole 111; the electrolyte injection component 20 is coaxially inserted into the first through hole 41 and connected to the first mounting component 40. During electrolyte injection, the electrolyte is injected into the battery through the injection channel 21 and the first injection hole 111 in sequence. By setting the first mounting component 40, it can be connected with the electrolyte injection component 20 to achieve rapid assembly and electrolyte injection, reducing the assembly difficulty of the electrolyte injection component 20, thereby shortening production time and improving production efficiency. At the same time, the contact area between the first mounting component 40 and the electrolyte injection component 20 is relatively larger, effectively improving the stability and connection reliability of the electrolyte injection component 20 during the electrolyte injection process.

[0056] Furthermore, refer to Figure 14 and Figure 15 As shown, in some embodiments of the battery electrolyte filling device of the present invention, a first mounting component 40 is provided with a first mounting groove 42 outside the first through hole 41, and the first mounting groove 42 is used to install the electrolyte filling component 20. By providing the first mounting groove 42 on the first mounting component 40 to install the electrolyte filling component 20, the stability and connection reliability of the electrolyte filling component 20 during the electrolyte filling process are further improved.

[0057] Furthermore, refer to Figure 19 and Figure 21 As shown, in some embodiments of the battery electrolyte filling device of the present invention, the electrolyte filling component 20 has a second mounting groove 23 formed on the outside of the electrolyte filling channel 21. When the electrolyte filling component 20 is connected to the first mounting component 40, the first mounting groove 42 and the second mounting groove 23 engage to form a sealing structure. By setting the second mounting groove 23, not only can the stability and connection reliability of the electrolyte filling component 20 be improved during the electrolyte filling process, but the sealing effect between the electrolyte filling component 20 and the first mounting component 40 can also be ensured, avoiding electrolyte leakage during the electrolyte filling process. This effectively reduces electrolyte loss and waste, and further reduces manufacturing costs.

[0058] Furthermore, refer to Figure 12 and Figure 13As shown, in some embodiments of the battery electrolyte filling device of the present invention, a second mounting component 50 is further included, which is connected to the battery. Preferably, the second mounting component 50 is disposed outside the battery to facilitate removal of the second mounting component 50 after electrolyte filling and subsequent processes. The second mounting component 50 has a second through hole 51, which communicates with the second electrolyte filling hole 112; the electrolyte storage component 30 is coaxially inserted into the second through hole 51 and connected to the second mounting component 50. During electrolyte filling, the electrolyte overflows into the electrolyte storage space 31 through the second electrolyte filling hole 112 and the first electrolyte storage hole 32 in sequence. When electrolyte filling stops, the electrolyte in the electrolyte storage space 31 enters the battery through the first electrolyte storage hole 32 and the second electrolyte filling hole 112 in sequence. By providing the second mounting component 50, the electrolyte storage component 30 can be installed, reducing the assembly difficulty of the electrolyte storage component 30, thereby shortening production time and improving production efficiency. Meanwhile, the contact area between the second mounting component 50 and the liquid storage component 30 is relatively larger, which effectively improves the stability and connection reliability of the liquid storage component 30 during the production process.

[0059] Furthermore, refer to Figure 14 and Figure 15 As shown, in some embodiments of the battery electrolyte filling device of the present invention, the second mounting component 50 has a third mounting groove 52 formed outside the second through hole 51, and the third mounting groove 52 is used to install the electrolyte storage component 30. By opening the third mounting groove 52 on the second mounting component 50 to install the electrolyte storage component 30, the stability and connection reliability of the electrolyte storage component 30 during the production process are further improved.

[0060] Furthermore, refer to Figure 20 and Figure 21 As shown, in some embodiments of the battery electrolyte filling device of the present invention, the electrolyte storage component 30 has a fourth mounting groove 34 formed outside the first electrolyte storage hole 32. When the electrolyte storage component 30 is connected to the second mounting component 50, the third mounting groove 52 and the fourth mounting groove 34 engage to form a sealing structure. By setting the fourth mounting groove 34, not only can the stability and connection reliability of the electrolyte storage component 30 be improved during the production process, but the sealing effect between the electrolyte storage component 30 and the second mounting component 50 can also be ensured, avoiding electrolyte leakage during the production process. This effectively reduces electrolyte loss and waste, further reducing manufacturing costs.

[0061] The system can be configured to provide only the first mounting component 40, only the first mounting slot 42 along with the first mounting component 40, a second mounting slot 23 along with both the first mounting component 40 and the first mounting slot 42, or only the second mounting component 50, a third mounting slot 52 along with the second mounting component 50, a fourth mounting slot 34 along with both the second mounting component 50 and the third mounting slot 52, etc., depending on actual needs. Preferably, the first mounting component 40, the first mounting slot 42, the second mounting slot 23, the second mounting component 50, the third mounting slot 52, and the fourth mounting slot 34 are provided simultaneously to achieve the best effect.

[0062] The battery electrolyte filling device of the present invention refers to... Figure 16 As shown, preferably, it also includes a first sealing component 61, which is used to seal the first electrolyte injection hole 111. After the electrolyte injection is completed, the first sealing component 61 can seal the first electrolyte injection hole 111, preventing external impurities from entering the battery through the first electrolyte injection hole 111 and also preventing electrolyte from overflowing from the first electrolyte injection hole 111. (Refer to...) Figure 17 As shown, preferably, the electrolyte storage component 30 has a second electrolyte storage hole 33. By providing the second electrolyte storage hole 33, the injection of electrolyte can be achieved more easily, reducing the vacuuming process for the battery, thereby shortening production time and improving production efficiency. Further, referring to... Figure 18 As shown, it also includes a second sealing component 62, which is used to seal the second electrolyte storage hole 33 or the second electrolyte injection hole 112. After the electrolyte is injected, the second sealing component 62 can seal the second electrolyte storage hole 33 or the second electrolyte injection hole 112, preventing external impurities from entering the battery through the second electrolyte storage hole 33 or the second electrolyte injection hole 112, and also preventing electrolyte from overflowing from the second electrolyte storage hole 33 or the second electrolyte injection hole 112. Specific sealing components, such as sealing plugs or sealing pins, can be set according to actual needs.

[0063] This invention discloses a battery electrolyte injection method based on the battery electrolyte injection device described in any of the above embodiments, comprising the following steps:

[0064] S1. Electrolyte is injected into the battery through the injection channel 21 and the first injection hole 111 until the electrolyte overflows into the storage space 31 and is full of electrolyte, then the injection is stopped.

[0065] S2. Let stand until all the electrolyte in the storage space 31 has entered the battery.

[0066] Depending on actual needs, the electrolyte storage component 30 can be removed and the second injection hole 112 sealed after all the electrolyte in the storage space 31 has entered the battery, and the battery can then be transported to the next workstation for the next process. Alternatively, the battery can be transported to the next workstation along with the electrolyte storage component 30, and the electrolyte storage component 30 can be removed after all the electrolyte in the storage space 31 has entered the battery and been consumed.

[0067] Working principle:

[0068] During electrolyte injection, the injection component 20 and the storage component 30 are assembled with their corresponding injection holes. Electrolyte is then injected through the injection component 20, first flowing into the battery through the injection channel 21 and the first injection hole 111. After the electrolyte circulates and wets the cell from top to bottom and then from bottom to top, it enters the storage space 31 through the second injection hole 112. Once the storage space 31 is full of electrolyte, the injection process stops, and the corresponding injection hole is sealed with a sealing component. The battery is then allowed to stand, allowing the electrolyte to fully wet the cell. The electrolyte in the storage space 31 then flows into the battery, again achieving top-to-bottom wetting. When all the electrolyte in the storage space 31 has entered the battery and been consumed, the storage component 30 is removed, the second injection hole 112 is sealed, and the battery is transported to the next processing station for the next step. Alternatively, the battery can be transported to a subsequent work station along with the electrolyte storage component 30, and the electrolyte storage component 30 can be removed after all the electrolyte in the electrolyte storage space 31 has entered the battery and been consumed.

[0069] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A battery electrolyte injection device for injecting electrolyte into a battery, characterized in that: The battery includes a first injection hole (111) and a second injection hole (112), both of which are connected to the interior of the battery. The battery electrolyte filling device includes: The electrolyte injection component (20) is detachably connected to the battery. An electrolyte injection channel (21) is formed inside the electrolyte injection component (20). Both ends of the electrolyte injection channel (21) are provided with electrolyte injection openings (22). The electrolyte injection channel (21) is connected to the first electrolyte injection hole (111) through the electrolyte injection openings (22). When electrolyte injection is performed, the electrolyte is injected into the battery through the electrolyte injection channel (21) and the first electrolyte injection hole (111) in sequence. A liquid storage component (30) is detachably connected to the battery. The liquid storage component (30) forms a liquid storage space (31). A first liquid storage hole (32) is provided on the liquid storage component (30). The liquid storage space (31) is connected to a second liquid injection hole (112) through the first liquid storage hole (32). When liquid is injected, the electrolyte overflows into the liquid storage space (31) through the second liquid injection hole (112) and the first liquid storage hole (32) in sequence. When liquid injection stops, the electrolyte in the liquid storage space (31) enters the battery through the first liquid storage hole (32) and the second liquid injection hole (112) in sequence. The area of ​​the injection opening (22) is smaller than the area of ​​the first storage hole (32). The area of ​​the injection opening (22) is S1, and the area of ​​the first storage hole (32) is S2, satisfying the relationship: S1=K*S2, where the value of K is in the range of 0.4-0.

8.

2. The battery electrolyte filling device according to claim 1, characterized in that: The area of ​​the injection opening (22) is not less than the area of ​​the first injection hole (111), and the area of ​​the first storage hole (32) is not less than the area of ​​the second injection hole (112).

3. The battery electrolyte filling device according to claim 1, characterized in that: The liquid storage component (30) is configured as a liquid storage tube, and the inner wall of the liquid storage tube is inclined so that the diameter of the first liquid storage hole (32) gradually decreases from one end to the end connected to the battery.

4. The battery electrolyte injection device according to claim 1, characterized in that, Also includes: A first mounting component (40) is connected to the battery. A first through hole (41) is provided on the first mounting component (40), and the first through hole (41) is connected to the first liquid injection hole (111). The electrolyte injection component (20) is coaxially inserted into the first through hole (41) and connected to the first mounting component (40); when electrolyte injection is performed, the electrolyte is injected into the battery through the electrolyte injection channel (21) and the first electrolyte injection hole (111) in sequence.

5. The battery electrolyte filling device according to claim 4, characterized in that: The first mounting component (40) has a first mounting groove (42) formed outside the first through hole (41), and the first mounting groove (42) is used to mount the liquid injection component (20).

6. The battery electrolyte injection device according to claim 5, characterized in that: The injection component (20) is located on the outside of the injection channel (21) and has a second mounting groove (23). When the injection component (20) is connected to the first mounting component (40), the first mounting groove (42) and the second mounting groove (23) engage to form a sealing structure.

7. The battery electrolyte filling device according to claim 1, 4, 5, or 6, characterized in that, Also includes: The second mounting component (50) is connected to the battery. The second mounting component (50) has a second through hole (51) which is connected to the second liquid injection hole (112). The liquid storage component (30) is coaxially inserted into the second through hole (51) and connected to the second mounting component (50); when liquid is injected, the electrolyte overflows into the liquid storage space (31) through the second injection hole (112) and the first liquid storage hole (32) in sequence; when liquid injection is stopped, the electrolyte in the liquid storage space (31) enters the interior of the battery through the first liquid storage hole (32) and the second injection hole (112) in sequence.

8. The battery electrolyte filling device according to claim 7, characterized in that: The second mounting component (50) has a third mounting groove (52) formed on the outside of the second through hole (51), and the third mounting groove (52) is used to mount the liquid storage component (30).

9. The battery electrolyte filling device according to claim 8, characterized in that: The liquid storage component (30) has a fourth mounting groove (34) formed on the outside of the first liquid storage hole (32). When the liquid storage component (30) is connected to the second mounting component (50), the third mounting groove (52) and the fourth mounting groove (34) engage to form a sealing structure.

10. A battery electrolyte injection method based on the battery electrolyte injection device according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. The electrolyte is injected into the battery through the injection channel (21) and the first injection hole (111) until the electrolyte overflows into the storage space (31) and is full, then the injection is stopped. S2. Let stand until all the electrolyte in the storage space (31) has entered the battery.

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