Battery liquid injection device and liquid injection system

Abstract

The utility model provides a kind of battery liquid injection device and liquid injection system, it is related to battery production equipment technical field, the battery liquid injection device includes positioning frame subassembly, liquid injection cup subassembly and adapter component.The positioning frame subassembly includes first fixed frame and second fixed frame, first fixed frame and second fixed frame are respectively with the opposite two ends of battery and are connected, liquid injection cup subassembly is used to assemble several liquid injection cups, and liquid injection cup subassembly is provided with several second positioning holes.The adapter component includes adapter and elastic piece, the end of adapter away from liquid injection cup subassembly is abutted with second fixed frame and is set towards first positioning hole, elastic piece is sleeved in adapter, and elastic piece is abutted between liquid injection cup subassembly and adapter.The utility model's liquid injection cup is connected battery by adapter to facilitate liquid injection to battery, so that liquid injection cup and battery can be assembled alignment, prevent the connection position between liquid injection cup subassembly and adapter from loosing, with preferable connection sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of battery production equipment technology, and more specifically, to a battery liquid injection device and liquid injection system. Background Technology

[0002] The electrolyte in a power battery ensures the smooth movement of ions between the positive and negative electrodes, enabling the battery's charging and discharging functions. The battery electrolyte filling device is used to inject electrolyte into the battery during the battery manufacturing process. Common battery electrolyte filling devices require seals to ensure a tight seal during the filling process. Cuts or damage to the seals at the battery casing opening, gaps between the battery and the filling cup, or loosening of the seal can all affect the sealing of the battery during electrolyte filling. Utility Model Content

[0003] The purpose of this utility model is to provide a battery liquid injection device and liquid injection system, which facilitates the liquid injection of batteries, prevents the connection between the liquid injection cup assembly and the adapter from becoming loose, ensures the tightness of the connection between the liquid injection cup assembly and the battery, and has a better connection sealing effect.

[0004] The first aspect of this utility model provides a battery electrolyte filling device, which includes:

[0005] The positioning frame assembly includes a first fixing frame and a second fixing frame, which are respectively engaged with opposite ends of the battery. The second fixing frame is provided with a plurality of first positioning holes, and one first positioning hole corresponds to one end of each battery.

[0006] The liquid injection cup assembly is used to assemble a plurality of liquid injection cups. The liquid injection cup assembly is provided with a plurality of second positioning holes, each second positioning hole corresponding to one liquid injection cup.

[0007] An adapter assembly includes an adapter and an elastic member. One end of the adapter passes through the second positioning hole, and the end of the adapter away from the injection cup assembly abuts against the second fixing bracket and is positioned towards the first positioning hole. The elastic member is sleeved on the adapter and abuts between the injection cup assembly and the adapter.

[0008] In one possible embodiment of this utility model, the positioning frame assembly, the adapter assembly, and the injection cup assembly are arranged sequentially along the first direction.

[0009] In one possible embodiment of this utility model, the adapter is provided with a liquid injection channel, one end of which is connected to the mouth of the liquid injection cup, and the other end of which is away from the liquid injection cup is connected to the liquid injection port of the battery.

[0010] In one possible embodiment of the present invention, the adapter assembly further includes a first elastic seal, and the opening of the liquid filling cup is connected to the end of the adapter away from the battery through the first elastic seal.

[0011] In one possible embodiment of this utility model, the second fixing bracket is provided with a second elastic seal, the second elastic seal abuts between the adapter and the battery, and the second elastic seal is located in the first positioning hole.

[0012] In one possible embodiment of the present invention, the first fixing frame is provided with a plurality of positioning slots, each of which is disposed opposite to a first positioning hole.

[0013] In one possible embodiment of the present invention, the liquid injection cup assembly includes a third fixing frame and a fourth fixing frame, the third fixing frame and the fourth fixing frame being disposed opposite to each other, the third fixing frame being provided with a third positioning hole, and the fourth fixing frame being provided with a second positioning hole, the third positioning hole corresponding to the second positioning hole.

[0014] In one possible embodiment of this utility model, the third fixing frame, the fourth fixing frame, the first fixing frame, and the second fixing frame are arranged in parallel.

[0015] In one possible embodiment of the present invention, a support member is further included, wherein the opposite ends of the support member are respectively connected to the second fixing frame and the third fixing frame, and the support member is engaged with the fourth fixing frame.

[0016] A second aspect of this invention provides a liquid injection system, including the battery liquid injection device described in any of the above embodiments.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a battery electrolyte injection device and system. The electrolyte injection cup contains electrolyte to be injected. The first and second fixing frames install and position the battery. The electrolyte injection cup is connected to the battery through an adapter to facilitate electrolyte injection. The adapter communicates with the battery in the positioning frame assembly through a first positioning hole and a second positioning hole to position the adapter. An elastic element abuts against the electrolyte injection cup assembly and the adapter, so that the electrolyte injection cup and the battery can be aligned and assembled, preventing the connection between the electrolyte injection cup assembly and the adapter from becoming loose, ensuring the tightness of the connection between the electrolyte injection cup assembly and the battery, and having a better connection sealing effect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the battery liquid injection device provided in some embodiments of the present invention;

[0020] Figure 2 This is a three-dimensional structural diagram of the positioning frame assembly of the battery liquid injection device provided in some embodiments of the present invention;

[0021] Figure 3 This is a cross-sectional view of the battery liquid injection device provided in some embodiments of the present invention;

[0022] Figure 4 This is a cross-sectional view of the positioning frame assembly of the battery liquid injection device provided in some embodiments of the present invention.

[0023] Figure 5 It shows Figure 3 A schematic diagram of the structure of part A in the middle.

[0024] Explanation of key component symbols;

[0025] 100-Battery filling device; 110-Positioning frame assembly; 111-First fixing frame; 1111-Positioning groove; 112-Second fixing frame; 1121-First positioning hole; 1122-Second elastic seal; 120-Filling cup assembly; 121-Third fixing frame; 1211-Third positioning hole; 122-Fourth fixing frame; 1221-Second positioning hole; 130-Adapter assembly; 131-Adapter; 1311-Filling channel; 132-Elastic element; 133-First elastic seal; 134-Limiting element; 140-Supporting element; 200-Filling cup; 300-Battery; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0026] 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, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0033] refer to Figure 1 and Figure 2As shown, an embodiment of this application provides a battery liquid filling device 100, which includes a positioning frame assembly 110, a liquid filling cup assembly 120, and an adapter assembly 130.

[0034] Specifically, in combination Figure 2 and Figure 3 As shown, the positioning frame assembly 110 includes a first fixing frame 111 and a second fixing frame 112. The first fixing frame 111 and the second fixing frame 112 are respectively engaged with opposite ends of the battery 300. The second fixing frame 112 is provided with a plurality of first positioning holes 1121, and one end of each battery 300 corresponds to one first positioning hole 1121. The liquid injection cup assembly 120 is used to assemble a plurality of liquid injection cups 200. The liquid injection cup assembly 120 is provided with a plurality of second positioning holes 1221, and each second positioning hole 1221 corresponds to one liquid injection cup 200. The liquid injection cup 200 contains electrolyte to be injected. The first fixing frame 111 and the second fixing frame 112 install the battery 300 and assemble and position the battery 300.

[0035] In the embodiments of this application, the adapter assembly 130 includes an adapter 131 and an elastic member 132. One end of the adapter 131 passes through the second positioning hole 1221, and the end of the adapter 131 away from the liquid filling cup assembly 120 abuts against the second fixing bracket 112 and is positioned towards the first positioning hole 1121. The elastic member 132 is sleeved on the adapter 131 and abuts between the liquid filling cup assembly 120 and the adapter 131. Correspondingly, the liquid filling cup 200 is connected to the battery 300 through the adapter 131 to facilitate the filling of the battery 300. During liquid injection, the adapter 131 connects to the battery 300 in the positioning frame assembly 110 through the first positioning hole 1121. The second positioning hole 1221 is used to position the adapter 131. The elastic member 132 abuts against the liquid injection cup assembly 120 and the adapter 131, so that the liquid injection cup 200 and the battery 300 can be assembled and aligned, preventing the connection between the liquid injection cup assembly 120 and the adapter 131 from becoming loose, ensuring the tightness of the connection between the liquid injection cup assembly 120 and the battery 300, having a better connection sealing effect, ensuring the production yield of the battery 300, and improving the quality of the battery 300.

[0036] refer to Figure 1 and Figure 2As shown, the battery filling device 100 has a first direction X, a second direction Y, and a third direction Z, wherein the first direction X, the second direction Y, and the third direction Z are arranged perpendicularly to each other. For example, the first direction X refers to the height direction of the battery filling device 100, the second direction Y refers to the width direction of the battery filling device 100, and the third direction Z refers to the length direction of the battery filling device 100. It is understood that the above definitions are only for ease of understanding the relative positional relationships of the various parts in the battery filling device 100 and should not be construed as limitations on this application.

[0037] In one embodiment, alternatively, referencing Figure 1 As shown, the positioning frame assembly 110, the adapter assembly 130 and the liquid injection cup assembly 120 are arranged sequentially along the first direction X, that is, the positioning frame assembly 110, the adapter assembly 130 and the liquid injection cup assembly 120 are arranged sequentially along the height direction of the battery liquid injection device 100, and the adapter assembly 130 is located between the positioning frame assembly 110 and the liquid injection cup assembly 120.

[0038] In one embodiment, alternatively, referencing Figure 1 and Figure 2 As shown, the first fixing frame 111 is provided with a plurality of positioning grooves 1111, and each of the positioning grooves 1111 is arranged opposite to a first positioning hole 1121, so that the positioning grooves 1111 and the first positioning holes 1121 of the second fixing frame 112 are coaxially aligned. During assembly and installation, the edge of the battery 300 casing is inserted into the positioning groove 1111.

[0039] In summary, the electrolyte filling cup 200 of the battery filling device 100 contains electrolyte to be filled. The first fixing frame 111 and the second fixing frame 112 install the battery 300 and assemble and position the battery 300. The electrolyte filling cup 200 is connected to the battery 300 through the adapter 131 to facilitate electrolyte filling of the battery 300. The adapter 131 communicates with the battery 300 in the positioning frame assembly 110 through the first positioning hole 1121. The second positioning hole 1221 is used to position the adapter 131. The elastic member 132 abuts against the electrolyte filling cup assembly 120 and the adapter 131, so that the electrolyte filling cup 200 and the battery 300 can be assembled and aligned, preventing the connection between the electrolyte filling cup assembly 120 and the adapter 131 from becoming loose, ensuring the tightness of the connection between the electrolyte filling cup assembly 120 and the battery 300, and having a better connection sealing effect.

[0040] refer to Figures 1 to 3 As shown, an embodiment of this application provides another battery filling device 100, which includes a positioning frame assembly 110, a filling cup assembly 120, and an adapter assembly 130.

[0041] Specifically, in combination Figure 2 and Figure 3 As shown, the positioning frame assembly 110 includes a first fixing frame 111 and a second fixing frame 112. The first fixing frame 111 and the second fixing frame 112 are respectively engaged with opposite ends of the battery 300. The second fixing frame 112 is provided with a plurality of first positioning holes 1121, and one first positioning hole 1121 corresponds to one end of each battery 300. The liquid injection cup assembly 120 is used to assemble a plurality of liquid injection cups 200. The liquid injection cup assembly 120 is provided with a plurality of second positioning holes 1221, and each second positioning hole 1221 corresponds to one liquid injection cup 200. The adapter assembly 130 includes an adapter 131 and an elastic member 132. One end of the adapter 131 passes through the second positioning hole 1221, and the end of the adapter 131 away from the injection cup assembly 120 abuts against the second fixing bracket 112 and faces the first positioning hole 1121. The elastic member 132 is sleeved on the adapter 131 and abuts between the injection cup assembly 120 and the adapter 131. Correspondingly, the injection cup 200 contains electrolyte to be injected. The first fixing bracket 111 and the second fixing bracket 112 install the battery 300 and assemble and position the battery 300. The injection cup 200 is connected via... The adapter 131 connects to the battery 300 to facilitate electrolyte filling. The adapter 131 communicates with the battery 300 in the positioning frame assembly 110 through the first positioning hole 1121. The second positioning hole 1221 is used to position the adapter 131. The elastic member 132 abuts against the electrolyte filling cup assembly 120 and the adapter 131, so that the electrolyte filling cup 200 and the battery 300 can be assembled and aligned, preventing the connection between the electrolyte filling cup assembly 120 and the adapter 131 from becoming loose, ensuring the tightness of the connection between the electrolyte filling cup assembly 120 and the battery 300, having a better connection sealing effect, ensuring the production yield of the battery 300, and improving the quality of the battery 300.

[0042] In one embodiment, alternatively, referencing Figure 1 As shown, the positioning frame assembly 110, the adapter assembly 130, and the liquid injection cup assembly 120 are arranged sequentially along the first direction X, that is, along the height direction of the battery liquid injection device 100, the positioning frame assembly 110, the adapter assembly 130, and the liquid injection cup assembly 120 are arranged sequentially, with the adapter assembly 130 located between the positioning frame assembly 110 and the liquid injection cup assembly 120. For example, the liquid injection cup assembly 120 is located above the positioning frame assembly 110. The positioning frame assembly 110 is used to support and place the battery 300. Under the action of gravity, the liquid injection cup assembly 120 allows the electrolyte to flow through the adapter assembly 130 into the battery 300 in the positioning frame assembly 110, achieving the purpose of liquid injection into the battery 300.

[0043] Optionally, such as Figure 3 As shown, the adapter 131 is provided with an injection channel 1311. One end of the injection channel 1311 is connected to the opening of the injection cup 200, and the other end of the injection channel 1311 away from the injection cup 200 is connected to the injection port of the battery 300. The injection channel 1311 connects the injection cup 200 and the battery 300 respectively, and the injection channel 1311 of the adapter 131 facilitates the passage of electrolyte. For example, the injection channel 1311 of the adapter 131 is arranged along a first direction X, and the extending direction of the injection channel 1311 is parallel to the first direction X.

[0044] In one embodiment, alternatively, referencing Figure 3 As shown, the adapter assembly 130 further includes a first elastic seal 133. The opening of the injection cup 200 is connected to the end of the adapter 131 away from the battery 300 via the first elastic seal 133. This allows the first elastic seal 133 to seal the connection between the opening of the injection cup 200 and the adapter 131, and also provides a cushioning effect to facilitate adjustment of the relative position between the opening of the injection cup 200 and the adapter 131. For example, the first elastic seal 133 can be nested within the opening of the injection cup 200, and the first elastic seal 133 is assembled and positioned with the adapter 131.

[0045] Furthermore, such as Figure 5 As shown, the adapter assembly 130 also includes a limiting member 134, which is connected to the end of the adapter 131 near the opening of the injection cup 200. The limiting member 134 limits the relative position of the adapter 131 and the fourth fixing bracket 122. For example, the limiting member 134 is a retaining ring, which is sleeved on one end of the adapter 131.

[0046] Optionally, refer to Figure 3 and Figure 5As shown, the second fixing bracket 112 is provided with a second elastic sealing element 1122. The second elastic sealing element 1122 abuts against the adapter 131 and the battery 300, and is located within the first positioning hole 1121. Correspondingly, the second elastic sealing element 1122 is embedded in the first positioning hole 1121. The second elastic sealing element 1122 is used to seal the gap between the adapter 131 and the battery 300. The axial sealing of the second elastic sealing element 1122 improves the sealing performance, keeping the electrolyte injection channel 1311 of the battery 300 in a vacuum state, so that the electrolyte can flow into the electrolyte injection port of the battery 300, preventing external impurities from entering due to poor sealing. The second fixing bracket 112 can be assembled and positioned with the battery 300, and the relative position between the second fixing bracket 112 and the battery 300 can be adjusted through the first positioning hole 1121. For example, the second elastic sealing element 1122 is a silicone sealing ring or a rubber sealing ring.

[0047] Among them, the battery sidewall is sealed to the second fixing bracket 112 and the end of the second fixing bracket 112 is sealed to the adapter 131. When the battery 300 passes through the first positioning hole 1121, the battery shell of the battery 300 can press against the second elastic seal 1122. For example, a cylindrical battery is inserted into the second elastic seal 1122 with a lip-shaped structure through the arc corner at the bottom of the shell, so as to reduce the wear of the battery shell on the second elastic seal 1122 when the battery is connected to the liquid filling cup assembly, which has a better technical effect.

[0048] Furthermore, a disc-shaped limiting block is provided at one end of the adapter 131 near the first positioning hole 1121. The limiting block abuts against the first positioning hole 1121 and defines the vacuum cavity. The liquid injection process is usually carried out in a vacuum environment to prevent the generation of air bubbles.

[0049] In this embodiment, as Figure 4 As shown, the second elastic seal 1122 can be a lip-shaped structure. The lip-shaped structure forms a lip protrusion to enhance the sealing effect and gives the second elastic seal 1122 a certain deformation capability, which can form a vacuum sealed space at the liquid injection port of the battery 300.

[0050] In one embodiment, alternatively, referencing Figure 1 and Figure 2As shown, the first fixing frame 111 is provided with a plurality of positioning slots 1111, each of which is opposite to a first positioning hole 1121, so that the positioning slot 1111 is coaxially aligned with the first positioning hole 1121 of the second fixing frame 112. During assembly and installation, the edge of the battery 300 casing is inserted into the positioning slot 1111. Furthermore, the plurality of positioning slots 1111 are arranged in an array structure, and each positioning slot 1111 is a V-shaped structure. The modular design facilitates the pre-assembly of the battery 300 and the liquid filling cup 200, reducing on-site installation time.

[0051] In one embodiment, alternatively, referencing Figure 1 and Figure 3 As shown, the injection cup assembly 120 includes a third fixing frame 121 and a fourth fixing frame 122. The third fixing frame 121 and the fourth fixing frame 122 are arranged opposite to each other. The third fixing frame 121 is provided with a third positioning hole 1211, and the fourth fixing frame 122 is provided with a second positioning hole 1221. The third positioning hole 1211 corresponds to the second positioning hole 1221. Accordingly, the third fixing frame 121 and the fourth fixing frame 122 respectively provide a third positioning hole 1211 and a second positioning hole 1221. The axes of the corresponding third positioning hole 1211 and the second positioning hole 1221 are collinear.

[0052] Optionally, such as Figure 1 As shown, the third fixing frame 121, the fourth fixing frame 122, the first fixing frame 111 and the second fixing frame 112 are arranged in parallel. The third fixing frame 121, the fourth fixing frame 122 together with the first fixing frame 111 and the second fixing frame 112 form four layers of parallel positioning surfaces. After being calibrated by a laser alignment instrument, they are fastened with high-strength bolts to form spatial cross constraints.

[0053] In one embodiment, alternatively, referencing Figure 1 As shown, the battery injection device 100 also includes a support member 140. The two opposite ends of the support member 140 are respectively connected to the second fixing frame 112 and the third fixing frame 121, and the support member 140 is engaged with the fourth fixing frame 122. The central slot of the support member 140 is also engaged with the fourth fixing frame 122, forming a closed force-bearing frame with the four fixing frames. Finite element analysis shows that the overall bending stiffness can be increased by at least 40%, effectively suppressing component deformation caused by fluctuations in injection pressure. For example, the two opposite ends of the support member 140 are respectively fixed to the side wall of the second fixing frame 112 and the platform of the third fixing frame 121 via flange connectors.

[0054] The present invention also provides a liquid injection system, which includes the battery liquid injection device 100 in the above embodiments. The liquid injection system including the battery liquid injection device 100 has all the beneficial effects of the battery liquid injection device 100, which will not be described in detail here.

[0055] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0056] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A battery electrolyte filling device, characterized in that, include: The positioning frame assembly includes a first fixing frame and a second fixing frame, which are respectively engaged with opposite ends of the battery. The second fixing frame is provided with a plurality of first positioning holes, and one first positioning hole corresponds to one end of each battery. The liquid injection cup assembly is used to assemble a plurality of liquid injection cups. The liquid injection cup assembly is provided with a plurality of second positioning holes, each second positioning hole corresponding to one liquid injection cup. An adapter assembly includes an adapter and an elastic member. One end of the adapter passes through the second positioning hole, and the end of the adapter away from the injection cup assembly abuts against the second fixing bracket and is positioned towards the first positioning hole. The elastic member is sleeved on the adapter and abuts between the injection cup assembly and the adapter.

2. The battery electrolyte injection device according to claim 1, characterized in that, The adapter and the first positioning hole define a sealed cavity. The adapter is provided with a liquid injection channel, which is connected to the sealed cavity.

3. The battery electrolyte injection device according to claim 2, characterized in that, One end of the injection channel is connected to the mouth of the injection cup, and the other end of the injection channel away from the injection cup is connected to the injection port of the battery.

4. The battery electrolyte injection device according to claim 3, characterized in that, The adapter assembly further includes a first elastic seal, and the opening of the liquid filling cup is connected to the end of the adapter away from the battery through the first elastic seal.

5. The battery electrolyte injection device according to claim 1, characterized in that, The second fixing bracket is provided with a second elastic seal, which abuts between the adapter and the battery, and the second elastic seal is located in the first positioning hole.

6. The battery electrolyte injection device according to claim 1, characterized in that, The first fixing frame is provided with a plurality of positioning slots, each of which is positioned opposite to one of the first positioning holes.

7. The battery electrolyte filling device according to any one of claims 1 to 6, characterized in that, The liquid injection cup assembly includes a third fixing frame and a fourth fixing frame, the third fixing frame and the fourth fixing frame are arranged opposite to each other, the third fixing frame is provided with a third positioning hole, and the fourth fixing frame is provided with a second positioning hole, the third positioning hole corresponding to the second positioning hole.

8. The battery electrolyte filling device according to claim 7, characterized in that, The third fixing frame, the fourth fixing frame, the first fixing frame, and the second fixing frame are arranged in parallel.

9. The battery electrolyte filling device according to claim 7, characterized in that, It also includes a support member, the two ends of which are respectively connected to the second fixing frame and the third fixing frame, and the support member is engaged with the fourth fixing frame.

10. A liquid injection system, characterized in that, Includes the battery electrolyte filling device according to any one of claims 1 to 9.

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