Battery liquid supplementing system

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery liquid supplementing system which comprises a sealing device and a liquid injection device, the liquid injection device comprises a liquid injection needle and a driving mechanism, the liquid injection needle is connected with the driving mechanism, the driving mechanism is used for controlling the liquid injection needle to pierce a battery cell air bag, and the liquid injection needle is used for injecting electrolyte into the battery cell air bag; the sealing device comprises a sealing assembly and a moving mechanism, the moving mechanism is connected with the sealing assembly, and the moving mechanism is used for controlling the sealing assembly to seal a liquid injection area, punctured by the liquid injection needle, of the battery cell air bag. According to the utility model, the sealing area of the sealing assembly is less, the effective capacity of the air bag area of the battery core is effectively increased, the problem of overlarge air pressure in the battery caused by gas generation in the formation process is avoided, the formation safety is greatly improved, and the automatic operation of liquid injection is improved.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a battery liquid replenishing system. Background Art

[0002] When the existing soft-pack battery is filled with liquid, the electrolyte is injected by cutting a notch in the air bag area of ​​the battery cell. For example, Patent Publication No. CN115020937A discloses a secondary liquid replenishment packaging auxiliary mechanism for soft-pack batteries. The liquid is replenished by cutting a flush incision, and the head height is adjusted and the sealing operation is performed using a production line heat sealer. Compared with manual cutting and liquid injection, the work efficiency is improved to a certain extent. However, the cutting results in a larger incision area, which reduces the effective capacity of the battery cell air bag area after the sealing incision is made after the liquid injection is completed, which is not conducive to the collection of gases generated by subsequent formation. In addition, the larger incision area may result in reduced airtightness after sealing, increasing the risk of gas leakage. Utility Model Content

[0003] The main purpose of the present application is to provide a battery refilling system, which aims to solve the technical problem that the current liquid filling port in the battery cell air bag area is formed by cutting.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a battery liquid replenishing system, including a sealing device and a liquid injection device;

[0005] The injection device comprises an injection needle and a driving mechanism, wherein the injection needle is connected to the driving mechanism, and the driving mechanism is used to control the injection needle to puncture the battery core air bag, and the injection needle is used to inject electrolyte into the battery core air bag;

[0006] The sealing device includes a sealing component and a moving mechanism, wherein the moving mechanism is connected to the sealing component and is used to control the sealing component to seal the injection area of ​​the battery cell air bag punctured by the injection needle.

[0007] Furthermore, the sealing assembly includes a connecting frame and a sealing body, one end of the connecting frame is fixedly connected to the sealing body, and the other end is movably connected to the moving mechanism.

[0008] Furthermore, a through hole is provided in the sealing body, and the injection needle is slidably provided in the through hole.

[0009] Furthermore, one end of the sealing rod is connected to the moving mechanism through the connecting frame, and the sealing head is connected to the other end of the sealing rod away from the connecting frame.

[0010] Furthermore, the sealing assembly also includes a heating system, and the heating system is arranged on the sealing head.

[0011] Furthermore, the battery replenishing system includes an electrolyte storage tank, and the injection device also includes an injection pump, one end of the injection pump is connected to the injection needle, and the other end is connected to the electrolyte storage tank, and the injection pump is used to transport the electrolyte in the electrolyte storage tank to the injection needle.

[0012] Furthermore, there are two sealing devices, and the two sealing devices are arranged opposite to each other.

[0013] Furthermore, there are two liquid injection devices, and the two liquid injection devices are arranged opposite to each other.

[0014] Furthermore, the heating system includes an induction coil and a temperature sensor, wherein the induction coil is used to heat the sealing head according to a control signal of an external control system, and the temperature sensor is used to detect a temperature value of the sealing head and send it to the external control system.

[0015] Furthermore, one end of the sealing head away from the sealing rod is a concave structure, the ports of the concave structure are flush, and the end surface of the port is a continuous closed loop structure.

[0016] Furthermore, silica gel is arranged on the end surface, and the silica gel extends along the entire circumference direction of the end surface.

[0017] Beneficial effects:

[0018] The utility model uses the driving mechanism to control the injection needle to puncture the battery cell air bag, the injection needle is used to inject electrolyte into the battery cell air bag, and the moving mechanism is used to control the sealing component to seal the injection area of ​​the battery cell air bag punctured by the injection needle. Therefore, compared with the cutting method, the puncturing method makes the area sealed by the sealing component smaller, effectively increasing the effective capacity of the battery cell air bag area, avoiding the problem of excessive internal air pressure of the battery caused by gas generation during the formation process, and greatly improving the safety of the formation. At the same time, the smaller sealing area helps to prevent electrolyte leakage or other safety problems, and the injection device and the sealing device can automatically inject electrolyte into the battery cell air bag and seal its injection area, effectively reducing the time and energy of manual operation, improving the automation of injection operation, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an overall schematic diagram of a battery refilling system according to an embodiment of the utility model;

[0020] Figure 2 This is an embodiment of the utility model Figure 1 A local enlarged view of point A;

[0021] Figure 3 It is a left side view of a head according to an embodiment of the present utility model.

[0022] in:

[0023] 1. Sealing device; 2. Liquid injection device; 3. Battery core air bag;

[0024] 10. Sealing assembly; 11. Moving mechanism;

[0025] 20. injection needle; 21. driving mechanism; 22. injection pump; 23. electrolyte storage tank;

[0026] 101. connecting frame; 102. sealing body; 103. heating system;

[0027] 1020, end cover; 1021, sealing rod; 1022, through hole; 1023, end face.

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0031] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] Reference Figure 1-Figure 2 , this embodiment provides a battery liquid replenishing system, including a sealing device 1 and a liquid injection device 2;

[0034] The injection device 2 includes an injection needle 20 and a driving mechanism 21, wherein the injection needle 20 is connected to the driving mechanism 21, and the driving mechanism 21 is used to control the injection needle 20 to puncture the battery core air bag 3, and the injection needle 20 is used to inject electrolyte into the battery core air bag 3;

[0035] The sealing device 1 includes a sealing component 10 and a moving mechanism 11 . The moving mechanism 11 is connected to the sealing component 10 . The moving mechanism 11 is used to control the sealing component 10 to seal the injection area of ​​the battery cell air bag 3 punctured by the injection needle 20 .

[0036] In the above embodiment, the battery replenishing system includes a sealing device 1 and an injection device 2, which are mainly used to inject electrolyte into the battery cell after the battery cell is assembled, wherein the injection device 2 includes an injection needle 20 and a driving mechanism 21, the driving mechanism 21 is used to control the injection needle 20 to puncture the battery cell air bag 3, the driving mechanism 21 is preferably a cylinder, so that the injection needle 20 and the cylinder are arranged on the sealing component 10, one end of the injection needle 20 is connected to the cylinder, and the other end of the cylinder is close to the battery cell air bag 3 as a free end, the cylinder controls the injection needle 20 to move toward the battery cell air bag 3 to puncture the battery cell air bag 3, and the injection needle 20 is used to inject electrolyte into the battery cell air bag 3, and the cylinder is connected to the external control system and can accurately puncture the battery cell air bag according to preset parameters and instructions. The predetermined liquid injection position and the predetermined puncture depth of the bag 3 can realize precise puncture operation, ensuring the accuracy and reliability of the liquid injection operation; the sealing device 1 includes a sealing component 10 and a moving mechanism 11, one end of the sealing component 10 is movably connected to the moving mechanism 11, and the other end of the moving mechanism 11 is close to the battery cell air bag 3 as a free end, wherein the battery cell air bag 3 is clamped by an external mechanism and is set at a position opposite to the battery refilling system. When the sealing component 10 needs to seal the battery cell air bag 3, the moving mechanism 11 controls the sealing component 10 to move toward the battery cell air bag 3, so that it fits in the liquid injection area of ​​the battery cell air bag 3 punctured by the injection needle 20 to complete the sealing, wherein the moving mechanism 11 shown in the accompanying drawings is a screw rod including a screw rod and a servo motor In addition, the moving mechanism 11 can also be any other driving device that can realize the movement of the sealing component 10. The servo motor is connected to the external control system and can accurately control the movement of the sealing component 10 through the screw rod according to the preset parameters and instructions to realize accurate sealing operation; when the battery cell is injected with liquid, the control mechanism first controls the injection needle 20 to move toward the battery cell air bag 3, and pierces the battery cell air bag 3 in the predetermined injection area of ​​the battery cell air bag 3, so that the pre-prepared electrolyte is injected into the battery cell air bag 3 through the injection needle 20, and then after the injection is completed, the injection needle 20 is removed so that the moving mechanism 11 controls the sealing component 10 to move toward the battery cell air bag 3, so that it fits in the predetermined injection area, and then the injection needle 20 pierces the battery cell air bag 3. A closed-loop sealing area is formed by the sealing component 10 within the entire circumferential range of the injection port formed by the bag 3. Therefore, compared with the large-area incision formed by cutting, the injection is performed by puncturing with the injection needle 20, so that the area sealed by the sealing component 10 is smaller, which effectively increases the effective capacity of the battery cell air bag 3 area, avoids the problem of excessive internal air pressure of the battery caused by gas generation during the formation process, and greatly improves the safety of the formation. At the same time, the smaller sealing area helps to prevent electrolyte leakage or other safety problems, and the electrolyte can be automatically injected into the battery cell air bag 3 and its injection area can be sealed through the injection device 2 and the sealing device 1, which effectively reduces the time and energy of manual operation, improves the automation operation of injection, and improves work efficiency.

[0037] Reference Figure 1-Figure 2 In one embodiment, the sealing assembly 10 includes a connecting frame 101 and a sealing body 102 , one end of the connecting frame 101 is fixedly connected to the sealing body 102 , and the other end is movably connected to the moving mechanism 11 .

[0038] In the above embodiment, the sealing assembly 10 includes a connecting frame 101 and a sealing body 102, wherein the connecting frame 101 is arranged at one end of the sealing body 102 close to the driving mechanism 21, and the sealing body 102 and the connecting frame 101 are arranged perpendicular to each other, and the moving mechanism 11 is movably connected to the other end of the connecting frame 101 away from the sealing body 102, and the moving mechanism 11 and the connecting frame 101 are arranged perpendicular to each other, so that the moving mechanism 11 and the sealing body 102 remain parallel to each other, wherein a thread that cooperates with the screw rod of the moving mechanism 11 is arranged on the connecting frame 101, so that the moving mechanism 11 controls the sealing body 102 to move forward or backward toward the battery cell air bag 3 through forward or reverse rotation, thereby ensuring the stability of the sealing body 102 during the movement, and effectively improving the stability of the entire sealing assembly 10.

[0039] Reference Figure 1-Figure 3 In one embodiment, a through hole 1022 is provided in the sealing body 102 , and the injection needle 20 is slidably disposed in the through hole 1022 .

[0040] In the above embodiment, a through hole 1022 for the injection needle 20 to pass through is provided in the middle part of the sealing body 102, wherein the diameter of the through hole 1022 is larger than the outer circle diameter of the injection needle 20, thereby ensuring that the injection needle 20 can slide smoothly in the through hole 1022 when it is built in the through hole 1022, and the injection needle 20 is controlled to move in the through hole 1022 by the driving mechanism 21. When injection is required, the driving mechanism 21 pushes the injection needle 20 to move in the through hole 1022 toward the battery cell air bag 3 and punctures the battery cell air bag 3 and injects liquid. After the injection is completed, the driving mechanism 21 controls the injection needle 20 to retract into the through hole 1022, and then controls the sealing body 102 to seal the injection area through the moving mechanism 11 while retracting the injection needle 20, thereby ensuring that the injection area is sealed immediately after the injection is completed, thereby avoiding leakage of electrolyte and improving the precise sealing of the injection area.

[0041] Furthermore, the injection needle 20 can also be set on the outside of the sealing body 102. When injection is needed, the injection needle 20 is first controlled by the driving mechanism 21 to move toward the battery cell air bag 3, puncture the battery cell air bag 3 and inject liquid. After the injection is completed and the injection needle 20 is retracted, the sealing body 102 is moved to the injection area by an external mechanism, or the battery cell air bag 3 is moved by an external mechanism so that its injection area corresponds to the sealing body 102, and then the sealing body 102 is controlled by the moving mechanism 11 to seal the injection area, which helps to prevent the electrolyte in the injection needle 20 from dripping into the inside of the sealing body 102, keeps the sealing body 102 clean, and improves the sealing effect of the battery cell air bag 3.

[0042] Reference Figure 1-Figure 2 In one embodiment, the sealing body 102 includes a sealing head 1020 and a sealing rod 1021, one end of the sealing rod 1021 is connected to the moving mechanism 11 through the connecting frame 101, and the sealing head 1020 is connected to the other end of the sealing rod 1021 away from the connecting frame 101.

[0043] In the above embodiment, the sealing body 102 includes a sealing head 1020 and a sealing rod 1021, wherein one end of the sealing rod 1021 is fixedly connected to a connecting frame 101, so that the sealing rod 1021 is connected to the moving mechanism 11 through the connecting frame 101, and the head 1020 is connected to the other end of the sealing rod 1021 away from the connecting frame 101, and the head 1020 and the sealing rod 1021 are integrated, ensuring that the connection between the head 1020 and the sealing rod 1021 is more secure. At the same time, the moving mechanism 11 drives the sealing rod 1021 to move through the connecting frame 101, and the head 1020 and the sealing rod 1021 are integrated, so that the moving mechanism 11 can more easily control the movement of the entire sealing body 102, making the movement of the sealing body 102 more flexible and precise.

[0044] Reference Figure 1-Figure 3 In one embodiment, the end of the sealing head 1020 away from the sealing rod 1021 is a concave structure, the port of the concave structure is flush, and the end surface 1023 of the port is a continuous closed loop structure.

[0045] In the above embodiment, the end of the head 1020 away from the sealing rod 1021 is a recessed structure, and the recessed structure is preferably bowl-shaped, so that the injection needle is located at the center of the recessed structure, and the end face 1023 of the port of the recessed structure maintains a flat plane, wherein the end face 1023 is the sealing surface of the head 1020. When the head 1020 is attached to the battery cell air bag 3 to seal the injection area, it is ensured that there is good sealing between the head 1020 and the battery cell air bag 3, reducing the possibility of leakage or seepage in the sealing area, and improving the sealing effect and quality. In addition, the entire circumference of the end face 1023 of the port is a continuous closed loop structure, wherein the end face 1023 is a circular, triangular or rectangular circumferential shape including but not limited to a closed loop. The sealing property of the sealing area is effectively improved, the possibility of leakage or seepage in the sealing area is reduced, and the sealing performance is improved. Silicone or other elastic and heat-conductive materials are arranged on the end face 1023, and the silicone extends along the entire circumference of the end face 1023 to fill the uneven concave part between the head 1020 and the battery cell air bag 3 to make it smoother, so as to ensure that the sealing area between the head 1020 and the battery cell air bag 3 has better flatness and improves the sealing effect. The elastic material has a certain buffering effect, which reduces the vibration and impact between the head 1020 and the battery cell air bag 3, helps to protect the stability of the entire liquid replenishing device, and prolongs the service life of the head 1020 and the sealing rod 1021.

[0046] Reference Figure 1-Figure 2 In one embodiment, the sealing assembly 10 further includes a heating system 103 , and the heating system 103 is disposed on the sealing head 1020 .

[0047] In the above embodiment, the sealing component 10 also includes a heating system 103, wherein the heating system 103 is arranged on the head 1020 and connected to the external control system, and is used to heat the head 1020 to perform thermoplasticization on the battery cell air bag 3, wherein the heating system 103 includes an induction coil and a temperature sensor, the material of the induction coil includes but is not limited to copper or copper alloy, the temperature sensor includes but is not limited to a thermistor or a thermocouple, the induction coil is used to heat the head 1020 according to the control signal of the external control system, the temperature sensor is used to detect the temperature value of the head 1020 and send it to the external control system, which helps the external system to grasp the temperature of the head 1020 in real time, and accurately control the heating process of the heating system 103 according to the data provided by the temperature sensor, to ensure that the head 1020 is always kept within the required temperature range, thereby improving the working efficiency and stability of the heating system, and the shape of the induction coil is set to correspond to the shape of the head 1020, so that the induction coil is a circular, triangular or rectangular circumferential shape including but not limited to a closed loop, to ensure that the induction coil can fully cover the surface of the head 1020 and achieve a uniform heating effect.

[0048] Reference Figure 1-Figure 2 In one embodiment, the battery replenishing system includes an electrolyte storage tank 23, and the injection device 2 also includes an injection pump 22, one end of the injection pump 22 is connected to the injection needle 20, and the other end is connected to the electrolyte storage tank 23, and the electrolyte in the electrolyte storage tank 23 is transported to the injection needle 20 through the injection pump 22.

[0049] In the above embodiment, the battery replenishing system includes an electrolyte storage tank 23, and the injection device 2 also includes an injection pump 22, wherein the electrolyte storage tank 23 is used to store electrolyte, and the electrolyte includes but is not limited to carbonate solvents, nitrile solvents or lithium hydrochloride, which can maintain good ionic conductivity and improve the performance of the battery cell; in addition, one end of the injection pump 22 is connected to the injection needle 20, and the other end is connected to the electrolyte storage tank 23. The power of the injection pump 22 and the opening of the infusion port are adjusted by an external control system, so that the electrolyte in the electrolyte storage tank 23 is transported to the injection needle 20 and injected into the battery cell air bag 3, which helps to accurately control the flow rate of the electrolyte and ensure that the amount of each injection is accurate, effectively improving the automation operation of the electrolyte delivery, saving the operator's time and energy, and improving work efficiency.

[0050] Reference Figure 1-Figure 2 In one embodiment, there are two sealing devices 1, and the two sealing devices 1 are arranged opposite to each other.

[0051] In the above embodiment, when there are two sealing devices 1, they are respectively arranged on both sides of the battery cell air bag 3, wherein when the battery cell air bag 3 is located between the two sealing devices 1, the sealing bodies 102 of the two sealing devices 1 are symmetrically arranged with the battery cell air bag 3 as the symmetry axis, ensuring that when the two sealing bodies 102 seal the liquid injection area of ​​the battery cell air bag 3, the two sealing bodies 102 can apply uniform pressure to the battery cell air bag 3, thereby ensuring the stability and reliability of the seal, and at the same time ensuring that the same sealing effect can be obtained on both sides of the battery cell air bag 3, thereby improving the sealing performance of the battery cell air bag 3.

[0052] Reference Figure 1-Figure 2 In one embodiment, there are two injection devices 2, and the injection devices 2 are arranged opposite to each other.

[0053] In the above embodiment, when the injection device 2 is set to two corresponding to the two sealing devices 1, the electrolyte storage tank 23 is one, and the two injection devices 2 are respectively located on both sides of the battery cell air bag 3 and connected to the electrolyte storage tank 23. When the battery cell air bag 3 is located between the two injection devices 2, the injection needles 20 of the two injection devices 2 are symmetrically arranged with the battery cell air bag 3 as the symmetry axis, ensuring that when the two injection devices 2 puncture the two sides of the battery cell air bag 3 for injection, the battery cell air bag 3 is first clamped and fixed by the two sealing devices 1 on both sides of the battery cell air bag 3, and the battery cell air bag 3 is clamped away from the two sealing devices 1. One end is clamped and fixed by an external clamping mechanism to keep it in a stable state, and then the two injection devices 2 extend from the through holes 1022 of the two sealing devices 1 to puncture the battery cell air bag 3 for injection, ensuring that the electrolyte is evenly injected into the battery cell air bag 3 from two directions, thereby achieving uniformity and consistency of injection, which helps to reduce the generation of electrolyte bubbles, and at the same time, injecting liquid from two directions at the same time improves the injection efficiency and shortens the injection time. When the battery cell air bag 3 is injected and sealed, the battery cell air bag 3 is moved to a predetermined position by the clamping mechanism, which is convenient for the operator to take out the battery cell air bag 3 that has been injected and sealed.

[0054] Furthermore, when the liquid injection device 2 and the sealing device 1 are respectively arranged on one side of the battery cell air bag 3, a supporting structure is arranged on the other side of the battery cell air bag 3 relative to the liquid injection device 2 or the sealing device 1, and in addition, the end of the battery cell air bag 3 away from the clamping of the sealing device 1 is clamped and fixed by an external clamping mechanism, ensuring that when the liquid injection device 2 and the sealing device 1 are injecting liquid and sealing the battery cell air bag 3, the battery cell air bag 3 can maintain a stable position and angle, avoiding the displacement of the injection area of ​​the battery cell air bag 3, effectively improving the accuracy of the injection and sealing of the battery cell air bag 3, and when the injection and sealing of the battery cell air bag 3 are completed, the battery cell air bag 3 is moved to a predetermined position by the clamping mechanism, so that the operator can take out the battery cell air bag 3 that has completed the injection and sealing.

[0055] Furthermore, when the battery cell air bag 3 is located between the two injection devices 2 for injection, the head 1020 and the injection needle 20 are located at one quarter of the battery cell air bag 3 from top to bottom, that is, the injection needle 20 and the head 1020 are injected and sealed at the upper quarter of the battery cell air bag 3. After the injection area is injected and sealed, it helps to avoid excessive loss of capacity of the battery cell air bag 3 due to sealing, and at the same time helps to reduce interference with the internal structure and other components of the battery cell, thereby ensuring the overall quality and performance of the battery cell.

[0056] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery refilling system, characterized in that: It includes a sealing device and a liquid injection device; The injection device comprises an injection needle and a driving mechanism, wherein the injection needle is connected to the driving mechanism, and the driving mechanism is used to control the injection needle to puncture the battery core air bag, and the injection needle is used to inject electrolyte into the battery core air bag; The sealing device includes a sealing component and a moving mechanism, wherein the moving mechanism is connected to the sealing component and is used to control the sealing component to seal the injection area of ​​the battery cell air bag punctured by the injection needle.

2. The battery refilling system according to claim 1, characterized in that: The sealing assembly comprises a connecting frame and a sealing body, one end of the connecting frame is fixedly connected to the sealing body, and the other end is movably connected to the moving mechanism.

3. The battery refilling system according to claim 2, characterized in that: The sealing body is provided with a through hole, and the injection needle is slidably arranged in the through hole.

4. The battery refilling system according to claim 2, characterized in that: The sealing body comprises a sealing head and a sealing rod, one end of the sealing rod is connected to the moving mechanism through the connecting frame, and the sealing head is connected to the other end of the sealing rod away from the connecting frame.

5. The battery refilling system according to claim 4, characterized in that: The sealing assembly further comprises a heating system, and the heating system is arranged on the sealing head.

6. The battery refilling system according to claim 1, characterized in that: The battery replenishing system includes an electrolyte storage tank, and the injection device also includes an injection pump, one end of the injection pump is connected to the injection needle, and the other end is connected to the electrolyte storage tank. The injection pump is used to transport the electrolyte in the electrolyte storage tank to the injection needle.

7. The battery refilling system according to claim 1, characterized in that: There are two sealing devices, and the two sealing devices are arranged opposite to each other.

8. The battery refilling system according to claim 1, characterized in that: There are two liquid injection devices, and the two liquid injection devices are arranged opposite to each other.

9. The battery refilling system according to claim 5, characterized in that: The heating system includes an induction coil and a temperature sensor. The induction coil is used to heat the sealing head according to a control signal of an external control system. The temperature sensor is used to detect the temperature value of the sealing head and send it to the external control system.

10. The battery refilling system according to claim 4, characterized in that: One end of the sealing head away from the sealing rod is a concave structure, the ports of the concave structure are flush, and the end surface of the port is a continuous closed loop structure.

11. The battery refilling system according to claim 10, characterized in that: Silicone rubber is arranged on the end surface and extends along the entire circumference direction of the end surface.

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