Battery liquid injection device

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery liquid injection device which comprises a liquid injection shell, a liquid injection mechanism and a pressure regulating mechanism, the liquid injection shell is provided with a liquid injection cavity, and the liquid injection cavity is configured to accommodate a to-be-injected battery cell; the liquid injection mechanism comprises a liquid storage assembly and a liquid injection pipe, the liquid injection pipe partially extends into the liquid injection cavity, the liquid storage assembly communicates with the liquid injection pipe, and the liquid storage assembly can heat the electrolyte; the pressure regulating mechanism is respectively communicated with the liquid injection pipe and the liquid injection cavity, the pressure regulating mechanism outputs positive pressure or negative pressure to the liquid injection pipe and the liquid injection cavity, and the pressure in the liquid injection cavity is always greater than that in the liquid injection pipe. The battery liquid injection device can reduce the swelling phenomenon of the battery and improve the qualified rate of the battery while ensuring that the battery liquid injection effect is relatively good and the performance of the battery product is excellent.

Description

Technical Field

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

[0002] Electrolyte is an important component of batteries, providing charge transfer and ion conductivity. In some types of batteries, the electrolyte exists in liquid form, so there is a step of adding liquid electrolyte to the battery during manufacturing or maintenance, which is called battery filling.

[0003] Battery filling ensures that the electrolyte liquid inside the battery is at the appropriate level and can provide the required ion transport and chemical reactions. It can also be used to replenish electrolyte loss, repair electrolyte concentration and balance the chemical composition inside the battery.

[0004] In the existing technology, isobaric injection is often performed through positive and negative pressure cycles. At the same time, in order to allow the electrolyte to be fully absorbed and infiltrated by the electrodes, diaphragms, etc. in the battery, the battery injection duration is relatively long. Otherwise, it is very likely that liquid leakage, shell swelling, etc. will occur, which will ultimately affect the battery's qualification rate. Utility Model Content

[0005] The purpose of the utility model is to provide a battery liquid filling device, which can reduce the battery bulging phenomenon and improve the battery qualification rate while ensuring a good battery liquid filling effect and excellent battery product performance.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A battery filling device, comprising:

[0008] The liquid injection housing is provided with a sealed liquid injection cavity;

[0009] The liquid injection mechanism includes a liquid storage component and a liquid injection tube, wherein the liquid injection tube partially extends into the liquid injection cavity, the liquid storage component is connected to the liquid injection tube, and the liquid storage component can heat the electrolyte;

[0010] The pressure regulating mechanism is connected to the injection tube and the injection cavity respectively, and the pressure regulating mechanism outputs positive pressure or negative pressure to the injection tube and the injection cavity. The pressure in the injection cavity is always greater than the pressure in the injection tube.

[0011] Optionally, the pressure regulating mechanism includes an air pressure regulating member, a first pipeline, and a first valve provided on the first pipeline, one end of the first pipeline is connected to the liquid injection pipe, and the other end is connected to the air pressure regulating member;

[0012] The pressure regulating mechanism further includes a second pipeline and a second valve provided on the second pipeline, wherein one end of the second pipeline is connected to the liquid injection cavity, and the other end is connected to the air pressure regulating member;

[0013] The air pressure regulating component is used to output positive pressure or negative pressure to the liquid injection tube and the liquid injection cavity. The first valve controls the on-off of the first pipeline, and the second valve controls the on-off of the second pipeline.

[0014] Optionally, the pressure regulating mechanism further includes a main pipeline, the other end of the first pipeline and the other end of the second pipeline are both connected to one end of the main pipeline, and the other end of the main pipeline is connected to the air pressure regulating component.

[0015] Optionally, the liquid storage assembly includes a heating tank and an insulation tank that are connected to each other, the insulation tank is connected to the liquid injection pipe, the heating tank is located upstream of the insulation tank, and the heating temperature of the heating tank is higher than the insulation temperature of the insulation tank.

[0016] Optionally, the liquid storage assembly further includes a liquid storage tank, which is communicated with the heating tank and located upstream of the heating tank, and a liquid replenishing valve is installed on the pipeline between the liquid storage tank and the heating tank.

[0017] Optionally, a liquid discharge valve is installed on the pipeline between the heating tank and the heat preservation tank, and a liquid injection valve is installed on the liquid injection pipe.

[0018] Optionally, the injection mechanism also includes a first heating element and a second heating element, the first heating element is arranged in the heating tank, and is used to heat the electrolyte in the heating tank, and the second heating element is arranged in the insulation tank, and is used to keep the temperature of the electrolyte in the insulation tank constant, and the heating temperature of the first heating element is higher than the heating temperature of the second heating element.

[0019] Optionally, the liquid injection mechanism further includes a temperature detection component, and the temperature detection component is respectively provided in the heating tank and the heat preservation tank.

[0020] Optionally, the liquid injection mechanism also includes a controller, which is respectively communicated with the first heating element, the second heating element and the two temperature detection elements. The controller can control the opening and closing of the first heating element and the second heating element respectively according to the temperature information in the heating tank and the insulation tank detected by the two temperature detection elements.

[0021] Optionally, an outer surface of the heating tank, an outer surface of the heat-insulating tank, an outer surface of a pipeline between the heating tank and the heat-insulating tank, and an outer surface of the liquid injection pipe are all provided with a heat-insulating layer.

[0022] Beneficial effects of the utility model:

[0023] The battery injection device provided by the present invention injects electrolyte into the battery cell to be injected through a liquid storage component and a liquid injection tube. The liquid storage component can heat and insulate the electrolyte to reduce the viscosity of the electrolyte, thereby promoting electrolyte infiltration and improving the problem of long electrolyte infiltration time and liquid leakage caused by slow infiltration speed. The pressure regulating mechanism is connected to the liquid injection tube and the liquid injection cavity respectively. The pressure regulating mechanism can evacuate the liquid injection tube and the liquid injection cavity respectively, and can also apply pressure to the liquid injection tube and the liquid injection cavity respectively, so that the pressure in the liquid injection cavity is always greater than the pressure in the liquid injection tube. Because the liquid injection tube is connected to the interior of the battery cell, the pressure in the liquid injection tube is equivalent to the internal pressure of the battery cell housing. The pressure regulating mechanism can create a pressure difference between the inside and outside of the battery cell housing, so that the pressure outside the battery cell housing (i.e., the pressure in the liquid injection cavity) is greater than the pressure inside the battery cell housing (i.e., the pressure in the liquid injection tube). The pressure difference is used to shape the battery cell housing, improve the problem of battery cell housing swelling, and effectively improve the qualified rate of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0025] Figure 1 It is a structural schematic diagram of a battery liquid filling device provided by an embodiment of the utility model.

[0026] In the picture:

[0027] 100. Battery cells to be filled with liquid;

[0028] 1. Liquid injection housing; 11. Liquid injection cavity;

[0029] 2. Liquid injection mechanism; 21. Liquid storage assembly; 211. Heating tank; 212. Insulation tank; 22. Liquid injection pipe; 23. Liquid discharge valve; 24. Liquid injection valve; 25. First heating element; 26. Second heating element; 27. Temperature detection element; 28. Liquid replenishing valve;

[0030] 3. Pressure regulating mechanism; 31. First pipeline; 32. First valve; 33. Second pipeline; 34. Second valve; 35. Main pipeline; 36. Air pressure regulating element. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] 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 rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply 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", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0036] It should also be noted that, in the description of this utility model, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0039] This embodiment provides a battery injection device for injecting electrolyte into a battery cell. Figure 1 As shown, the battery liquid filling device includes a liquid filling shell 1, a liquid filling mechanism 2 and a pressure regulating mechanism 3.

[0040] Among them, the liquid injection shell 1 is provided with a liquid injection cavity 11, and the liquid injection cavity 11 is configured to accommodate the battery cell 100 to be injected. The liquid injection mechanism 2 includes a liquid storage component 21 and a liquid injection tube 22. The liquid injection tube 22 partially extends into the liquid injection cavity 11 and is connected to the injection hole of the battery cell 100 to be injected. The liquid storage component 21 is connected to the liquid injection tube 22, and the liquid storage component 21 can heat and keep the electrolyte warm. In other words, the electrolyte is injected into the battery cell 100 to be injected through the liquid storage component 21 and the liquid injection tube 22. The liquid storage component 21 can heat and keep the electrolyte warm to reduce the viscosity of the electrolyte, thereby promoting the infiltration of the electrolyte and improving the problem of long time consumption and liquid bubbling caused by slow infiltration speed.

[0041] Specifically, if Figure 1 As shown, the liquid storage assembly 21 includes a heating tank 211 and an insulation tank 212, and the insulation tank 212 is connected to the injection pipe 22. The heating temperature of the heating tank 211 is higher than the insulation temperature of the insulation tank 212, so that the electrolyte can be quickly heated in the heating tank 211. The heated electrolyte flows from the heating tank 211 into the insulation tank 212 to ensure the constant temperature of the electrolyte. Finally, the electrolyte is injected from the insulation tank 212 through the injection pipe 22 into the battery cell 100 to be injected, completing the injection process of the battery cell.

[0042] To be more specific, the liquid injection mechanism 2 also includes a first heating element 25 and a second heating element 26. The first heating element 25 is arranged in the heating tank 211, and is used to heat the electrolyte in the heating tank 211; the second heating element 26 is arranged in the insulation tank 212, and is used to keep the temperature of the electrolyte in the insulation tank 212 constant. The heating temperature of the first heating element 25 is higher than the heating temperature of the second heating element 26, so that the temperature of the electrolyte in the heating tank 211 rises rapidly. In this embodiment, the first heating element 25 and the second heating element 26 can be selected as components such as heating tubes or heating coils in the prior art that can achieve electrolyte heating, and their structures and heating principles are not described here. At the same time, the heating temperatures of the first heating element 25 and the second heating element 26 can be determined by themselves according to the physical and chemical properties of the electrolyte used, preferably 25 to 80°C.

[0043] Optionally, the injection mechanism 2 further includes a temperature detector 27, which is provided in each of the heating tank 211 and the insulation tank 212. In this embodiment, the temperature detectors 27 are mounted on the bottom of the inner cavities of the heating tank 211 and the insulation tank 212, respectively. The temperature detectors 27 can accurately detect the electrolyte temperature in the heating tank 211 and the insulation tank 212. Preferably, the temperature detectors 27 are temperature sensors with good sensitivity.

[0044] More specifically, the liquid injection mechanism 2 further includes a controller (not shown), which is in communication with the first heating element 25, the second heating element 26, and the two temperature detection elements 27. The controller can control the opening and closing of the first heating element 25 and the second heating element 26, respectively, based on the temperature information within the heating tank 211 and the insulation tank 212 detected by the two temperature detection elements 27. In this embodiment, the controller can be a PLC or single-chip microcomputer in the prior art, and the controller can realize real-time control of the electrolyte temperature within the heating tank 211 and the insulation tank 212.

[0045] Continue to refer to Figure 1 A liquid discharge valve 23 is installed on the pipeline between the heating tank 211 and the insulation tank 212, and a liquid injection valve 24 is installed on the liquid injection pipe 22. The liquid storage assembly 21 also includes a liquid storage tank (not shown), which is connected to the heating tank 211. A liquid replenishment valve 28 is installed on the pipeline between the liquid storage tank and the heating tank 211. Specifically, the liquid discharge valve 23, the liquid injection valve 24, and the liquid replenishment valve 28 can all be solenoid valves known in the art.

[0046] In this embodiment, the electrolyte first flows from the liquid storage tank into the heating tank 211 through the connecting pipeline. At this time, the refill valve 28 is opened, the liquid discharge valve 23 is closed, and the first heating element 25 is opened to quickly heat the electrolyte in the heating tank 211. While heating the electrolyte in the heating tank 211, the insulation tank 212, the injection tube 22 and the battery cell 100 to be injected are checked for leaks, specifically, vacuuming the insulation tank 212 and the battery cell shell to be in a state close to vacuum. After the heating is completed, the first heating element 25 is closed, the liquid discharge valve 23 is opened, and the electrolyte flows from the heating tank 211 into the insulation tank 212 under the action of gravity and gas pressure. At this time, the injection valve 24 is also in an open state, and the electrolyte can be directly injected into the shell of the battery cell 100 to be injected.

[0047] Optionally, to ensure a constant temperature of the electrolyte and reduce heat loss, an insulation layer is provided on the outer surface of the heating tank 211, the outer surface of the insulation tank 212, the outer surface of the pipeline between the heating tank 211 and the insulation tank 212, and the outer surface of the injection pipe 22. The insulation layer may be, but is not limited to, an insulation cotton layer.

[0048] like Figure 1 As shown, the pressure regulating mechanism 3 is in communication with the injection tube 22 and the injection chamber 11, respectively. The pressure regulating mechanism 3 can evacuate the injection tube 22 and the injection chamber 11, respectively, and can also apply pressure to the injection tube 22 and the injection chamber 11, respectively, so that the pressure in the injection chamber 11 is always greater than the pressure in the injection tube 22. In this embodiment, the pressure regulating mechanism 3 applies pressure to the injection tube 22 and the injection chamber 11 by introducing high-pressure nitrogen gas.

[0049] It is understood that because the injection tube 22 is connected to the interior of the battery cell 100 to be injected, the pressure within the injection tube 22 is equivalent to the pressure within the battery cell housing. The vacuum and pressurization operations of the pressure regulating mechanism 3 can create a pressure differential between the inside and outside of the battery cell housing. The pressure outside the battery cell housing (i.e., the pressure within the injection chamber 11) is greater than the pressure inside the battery cell housing (i.e., the pressure within the injection tube 22). This pressure differential is used to reshape the battery cell housing, improve the problem of battery cell housing swelling, and effectively improve the battery quality rate.

[0050] Specifically, the pressure regulating mechanism 3 includes an air pressure regulating member 36, a first pipeline 31, a first valve 32 provided on the first pipeline 31, a second pipeline 33, and a second valve 34 provided on the second pipeline 33. One end of the first pipeline 31 is connected to the liquid injection tube 22, and the other end is connected to the air pressure regulating member 36; one end of the second pipeline 33 is connected to the liquid injection chamber 11, and the other end is connected to the air pressure regulating member 36. The air pressure regulating member 36 can be a set of vacuum pumps and booster pumps, wherein the vacuum pump is used for vacuuming, and the booster pump is used for pressurizing the gas. The structure and operating principle of the vacuum pump and the booster pump belong to the prior art and will not be described in detail here.

[0051] In this embodiment, when the air pressure regulating member 36 is used to evacuate the liquid injection tube 22 and the liquid injection chamber 11, the first valve 32 opens by a first preset time before the second valve 34. When the air pressure regulating member 36 is used to apply pressure to the liquid injection tube 22 and the liquid injection chamber 11, the second valve 34 opens by a second preset time before the first valve 32. By controlling the order in which the first and second valves 32, 34 are opened, a pressure differential is created between the pressure inside the cell housing and the pressure inside the liquid injection chamber 11. This creates a greater external pressure than the internal pressure within the cell housing. This pressure differential can be used to reshape the cell housing, thereby reducing swelling.

[0052] Optionally, the first preset time t1 is in the range of 0 < t1 ≤ 2s, preferably 1s. The second preset time t2 is in the range of 0 < t2 ≤ 2s, preferably 1s. This arrangement ensures that the pressure difference between the injection chamber 11 and the injection tube 22 is 10 to 50 kPa, and the interior of the battery cell housing is in a slightly negative pressure state relative to the interior of the injection chamber 11.

[0053] More specifically, the pressure regulating mechanism 3 further includes a main line 35. The other end of the first line 31 and the other end of the second line 33 are both connected to one end of the main line 35, and the other end of the main line 35 is connected to an air pressure regulating member 36. That is, in this embodiment, the other end of the first line 31 and the other end of the second line 33 converge and connect to the main line 35, and are connected to an air pressure regulating member 36, i.e., a set of vacuum pumps and booster pumps, through the main line 35. This set of vacuum pumps and booster pumps can be used to achieve vacuuming and pressurizing operations in the injection tube 22 and the injection chamber 11, respectively. Of course, in other embodiments, the other end of the first line 31 can also be connected to one air pressure regulating member 36, and the other end of the second line 33 can be connected to another air pressure regulating member 36, so that two sets of air pressure regulating members 36 are used to control the pressures in the injection chamber 11 and the injection line 22, respectively. This embodiment is not limited to this.

[0054] The specific steps of the battery liquid filling device provided in this embodiment are as follows:

[0055] S1. Place the battery cell 100 to be filled with liquid into the liquid filling cavity 11 and lock it in place.

[0056] S2. Open the liquid replenishing valve 28 and close the liquid discharge valve 23 to allow the electrolyte to flow from the liquid storage tank into the heating tank 211. Turn on the first heating element 25 to heat the electrolyte in the heating tank 211. While heating the electrolyte in the heating tank 211, check for leaks in the insulation tank 212, the injection tube 22, and the battery cell 100 to be injected. Specifically, vacuum check for leaks to ensure that the insulation tank 212 and the battery cell housing are in a near-vacuum state.

[0057] S3. After heating is completed, the first heating element 25 is turned off, the liquid discharge valve 23 is opened, and the electrolyte flows from the heating tank 211 into the insulation tank 212 under the action of gravity and gas pressure. At this time, the liquid injection valve 24 is also in the open state, so the electrolyte can be directly injected into the shell of the battery cell 100 to be injected.

[0058] S4. Keep the injection valve 24 open and close the lower liquid valve 23. First, evacuate the injection tube 22 and the injection chamber 11 using a vacuum pump, and open the first valve 32 a first preset time before the second valve 34. Then, maintain pressure for the first hold time. Next, use the booster pump to increase pressure in the injection tube 22 and the injection chamber 11, and open the second valve 34 a second preset time before the first valve 32. Finally, stepwise pressure is applied and maintained for the second hold time, using the pressure difference between the injection chamber 11 and the cell housing to shape the cell housing.

[0059] S5, breaking the vacuum, unlocking the liquid injection shell 1, and unloading the battery cells after liquid injection.

[0060] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery filling device, characterized in that: include: A liquid injection housing (1) is provided with a sealed liquid injection cavity (11); A liquid injection mechanism (2) comprising a liquid storage component (21) and a liquid injection tube (22), wherein the liquid injection tube (22) partially extends into the liquid injection cavity (11), the liquid storage component (21) is in communication with the liquid injection tube (22), and the liquid storage component (21) is capable of heating the electrolyte; The pressure regulating mechanism (3) is respectively connected to the liquid injection pipe (22) and the liquid injection chamber (11). The pressure regulating mechanism (3) outputs positive pressure or negative pressure to the liquid injection pipe (22) and the liquid injection chamber (11). The pressure in the liquid injection chamber (11) is always greater than the pressure in the liquid injection pipe (22).

2. The battery liquid filling device according to claim 1, characterized in that: The pressure regulating mechanism (3) comprises an air pressure regulating member (36), a first pipeline (31), and a first valve (32) provided on the first pipeline (31); one end of the first pipeline (31) is in communication with the liquid injection pipe (22), and the other end is in communication with the air pressure regulating member (36); The pressure regulating mechanism (3) further comprises a second pipeline (33) and a second valve (34) provided on the second pipeline (33); one end of the second pipeline (33) is in communication with the liquid injection cavity (11), and the other end is in communication with the air pressure regulating member (36); The air pressure regulating member (36) is used to output positive pressure or negative pressure to the liquid injection pipe (22) and the liquid injection chamber (11); the first valve (32) controls the on-off of the first pipeline (31); and the second valve (34) controls the on-off of the second pipeline (33).

3. The battery liquid filling device according to claim 2, characterized in that: The pressure regulating mechanism (3) further comprises a main pipeline (35), the other end of the first pipeline (31) and the other end of the second pipeline (33) are both connected to one end of the main pipeline (35), and the other end of the main pipeline (35) is connected to the air pressure regulating member (36).

4. The battery liquid filling device according to any one of claims 1 to 3, characterized in that: The liquid storage assembly (21) comprises a heating tank (211) and a heat preservation tank (212) which are connected to each other. The heat preservation tank (212) is connected to the liquid injection pipe (22). The heating tank (211) is located upstream of the heat preservation tank (212). The heating temperature of the heating tank (211) is higher than the heat preservation temperature of the heat preservation tank (212).

5. The battery liquid filling device according to claim 4, characterized in that: The liquid storage assembly (21) further comprises a liquid storage tank, which is in communication with the heating tank (211) and is located upstream of the heating tank (211). A liquid replenishing valve (28) is installed on the pipeline between the liquid storage tank and the heating tank (211).

6. The battery liquid filling device according to claim 4, characterized in that: A liquid discharge valve (23) is installed on the pipeline between the heating tank (211) and the heat preservation tank (212), and a liquid injection valve (24) is installed on the liquid injection pipe (22).

7. The battery liquid filling device according to claim 4, characterized in that: The injection mechanism (2) further comprises a first heating element (25) and a second heating element (26); the first heating element (25) is arranged in the heating tank (211) and is used to heat the electrolyte in the heating tank (211); the second heating element (26) is arranged in the heat preservation tank (212) and is used to keep the temperature of the electrolyte in the heat preservation tank (212) constant; the heating temperature of the first heating element (25) is higher than the heating temperature of the second heating element (26).

8. The battery liquid filling device according to claim 7, characterized in that: The liquid injection mechanism (2) further includes a temperature detection component (27), and the temperature detection component (27) is respectively provided in the heating tank (211) and the heat preservation tank (212).

9. The battery liquid filling device according to claim 8, characterized in that: The liquid injection mechanism (2) further includes a controller, which is respectively connected to the first heating element (25), the second heating element (26) and the two temperature detection elements (27). The controller can control the opening and closing of the first heating element (25) and the second heating element (26) according to the temperature information in the heating tank (211) and the heat preservation tank (212) detected by the two temperature detection elements (27).

10. The battery liquid filling device according to claim 4, characterized in that: The outer surface of the heating tank (211), the outer surface of the heat-insulating tank (212), the outer surface of the pipeline between the heating tank (211) and the heat-insulating tank (212), and the outer surface of the liquid injection pipe (22) are all provided with a heat-insulating layer.

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