Rapid liquid injection research device and method for battery

Abstract

The invention provides a rapid battery liquid injection research device and method.The rapid battery liquid injection research device is used for a detachable built-in installation battery cell pole group and comprises a battery shell, a liquid injection assembly and a gas circuit assembly, and the battery shell is provided with a positive pole, a negative pole and a closable installation opening; the built-in disassembly and assembly is butted with positive and negative electrodes of a battery cell pole group; the liquid injection assembly is mounted on the battery shell and is provided with a liquid injection end for injecting electrolyte into the battery shell; and the gas path assembly is mounted on the battery shell and is provided with a gas path end for adjusting the internal gas pressure of the battery shell. According to the invention, the battery shell is used as a research container, the battery cell pole group can be disassembled and replaced, and the device can be wiped and dried after the battery cell pole group is disassembled, so that the device can be repeatedly used; the rapid liquid injection process of vacuum liquid injection and pressurized infiltration can be realized by matching with the liquid injection assembly and the gas circuit assembly for research, so that the research of the rapid liquid injection process can be repeated.

Description

Technical Field

[0001] The present invention relates to the technical field of battery rapid liquid injection process research, and particularly relates to a battery rapid liquid injection research device and method. Background Art

[0002] With the increasingly wide application of new energy vehicles, the research on power batteries as power sources has become more and more refined. In the process of cell production, injecting electrolyte is a key process, and various parameters such as flow rate, injection volume, liquid distribution, etc. require extremely high precision to ensure uniform filling of the electrolyte and avoid problems such as air bubbles and liquid leakage.

[0003] Most of the current battery liquid injection technologies focus on how to inject liquid quickly. For example, Chinese Patent CN117352967A discloses a liquid injection method suitable for rapid infiltration of electrolyte in soft-pack batteries, which realizes rapid liquid injection through negative pressure - atmospheric pressure cycling; Chinese Patent CN118399033A discloses a device for rapid battery liquid injection, including a device main body, which has threaded counterbores and exhaust channels, and is provided with an exhaust pipe and an exhaust cup, and can realize rapid liquid injection.

[0004] For the above-mentioned existing technologies, they only involve devices for rapid liquid injection, and do not involve research devices for the electrolyte infiltration process and dispersion process within a short time at the beginning of liquid injection. Currently, due to the characteristics of one-time use in the research of the cell liquid injection process and activation effect, the cost is high and the R & D process is long. Therefore, a battery rapid liquid injection research device and method are proposed to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a battery rapid liquid injection research device to solve the technical problems in the existing technology that currently, due to the characteristics of one-time use in the research of the cell liquid injection process and activation effect, the cost is high and the R & D process is long.

[0006] To achieve the above technical purpose, the present invention adopts the following technical solutions: In the first aspect, the present invention provides a battery rapid liquid injection research device for detachably and internally installing a cell electrode group, including: A battery housing, which is provided with a positive electrode post, a negative electrode post, and a closable installation port for internal disassembly and assembly of the positive and negative electrodes of the cell electrode group; A liquid injection assembly, which is installed on the battery housing and has a liquid injection end for injecting electrolyte into the interior of the battery housing; and An air circuit assembly, which is installed on the battery housing and has an air circuit end for adjusting the air pressure inside the battery housing.

[0007] In some embodiments, the battery housing includes a first housing, a second housing, and a sealing assembly. The mounting opening is provided on one side of the first housing for the insertion and removal of the electrode group of the battery cell. The second housing is detachably connected to the mounting opening to form an internal space that closes and houses the electrode group of the battery cell. The sealing assembly is disposed between the first housing and the second housing to seal the gap between the first housing and the second housing.

[0008] In some embodiments, the sealing assembly includes a sealing rubber ring. A sealing ring groove is provided on one side of the first housing corresponding to the mounting opening, and the sealing rubber ring is inserted into the sealing ring groove.

[0009] In some embodiments, both the positive electrode post and the negative electrode post penetrate the inside and outside of the battery housing, and a current guiding sheet extends at one end located inside the battery housing. The current guiding sheets are respectively crimped to the positive and negative electrodes of the electrode group of the battery cell by screws for conducting current.

[0010] In some embodiments, the battery housing is a transparent housing.

[0011] In some embodiments, a pressure detection mechanism is further included. It is installed on the battery housing and has a detection end for detecting changes in the internal pressure value of the battery housing.

[0012] In some embodiments, threaded holes corresponding to the detection end, the liquid injection end, and the gas path end are provided on the battery housing. External threads are provided on the outside of the detection end, the liquid injection end, and the gas path end, and they are connected to the corresponding threaded holes through the external threads. And a sealing glue is provided between the threaded holes and the corresponding external threads.

[0013] In some embodiments, the liquid injection assembly includes a liquid supply mechanism and a liquid injection valve. The liquid injection valve is detachably installed on the battery housing, and the liquid supply mechanism is detachably connected to the liquid injection valve for supplying electrolyte.

[0014] In some embodiments, the gas path assembly includes a vacuum pump, a pressure gas cylinder, and a gas valve. The gas valve is detachably installed on the battery housing, and the vacuum pump and the pressure gas cylinder are both detachably connected to the gas valve, respectively for evacuating and supplying gas for pressurization.

[0015] In a second aspect, the present invention also provides a method for studying rapid battery liquid injection, which is carried out using the battery rapid liquid injection research device described in any one of the above, and includes the following steps: The positive and negative electrodes of the electrode group of the battery cell are pressed onto the positive electrode post and the negative electrode post of the battery housing, and are installed inside the battery housing; Connect the positive electrode post and the negative electrode post to the charge and discharge cabinet, close the liquid injection assembly, and turn on the gas path assembly to evacuate; After evacuating the air, close the gas path assembly, and then open the liquid injection assembly to inject the electrolyte into the interior of the battery case; After all the electrolyte is injected, close the liquid injection assembly, open the gas path assembly to inject gas and pressurize, and supply the electrolyte to infiltrate and disperse; After the test discharge is completed, take out the cell stack, wipe and dry the device for repeated use.

[0016] Compared with the prior art, the battery rapid liquid injection research device provided by the present invention uses the battery case as a research container, can disassemble and replace the cell stack, and after removing the cell stack, the device can be wiped and dried for repeated use; combined with the liquid injection assembly and the gas path assembly, it can realize the rapid liquid injection process of vacuum liquid injection and pressurized infiltration for research use, making the research on the rapid liquid injection process repeatable and operable by a single person, greatly reducing the research cost, and can study parameters such as voltage, air pressure, liquid injection volume, and liquid injection speed that affect the performance of the cell within a short time before and after liquid injection. Description of the Drawings

[0017] Figure 1 is a three-dimensional explosion schematic diagram of the battery rapid liquid injection research device provided by the embodiment of the present invention; Figure 2 is a top view of the sealing rubber ring and the first housing of the battery rapid liquid injection research device provided by the embodiment of the present invention; Figure 3 is a side view of the crimping of the pole column and the tab of the cell stack of the battery rapid liquid injection research device provided by the embodiment of the present invention; Figure 4 is a front view of the battery rapid liquid injection research device provided by the embodiment of the present invention.

[0018] Description of the Reference Numerals: 1. Battery case; 1a. Positive pole column; 1b. Negative pole column; 1c. Mounting port; 1d. Drainage sheet; 1e. Threaded hole; 11. First housing; 12. Second housing; 13. Sealing assembly; 13a. Sealing rubber ring; 13b. Sealing ring groove; 2. Liquid injection assembly; 201. Liquid injection end; 21. Liquid injection valve; 3. Gas path assembly; 301. Gas path end; 31. Gas valve; 4. Pressure detection mechanism; 401. Detection end; 41. Pressure sensor; 5. Cell stack. Detailed Embodiments

[0019] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. 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.

[0020] In order to solve the current technical problems of high cost and long R & D process caused by the characteristics of single - use in the research of the electrolyte injection process and activation effect of battery cells, the present invention provides a battery rapid electrolyte injection research device and method. It can realize using the battery case as the research container, disassembling and replacing the cell electrode group, and after removing the cell electrode group, wiping and drying the device for repeated use; cooperating with the injection component 2 and the gas circuit component, it can realize the rapid electrolyte injection process of vacuum injection and pressure infiltration for research use, making the research of the rapid electrolyte injection process repeatable and operable by a single person, greatly reducing the research cost, and can study the parameters affecting the performance of the battery cell such as voltage, air pressure, injection volume, injection speed, etc. in a short time before and after injection.

[0021] It should be noted that the battery rapid electrolyte injection research device described in the present invention is applicable to but not limited to power batteries, etc. For the convenience of description, in the present invention, only the case where the battery rapid electrolyte injection research device is applied to power batteries is taken as an example for description, and the principle of the battery rapid electrolyte injection research device applied to other types of equipment is essentially the same as that applied to power batteries, and will not be elaborated here one by one.

[0022] Please refer to Figure 1 , Figure 1 which is a three - dimensional explosion schematic diagram of the battery rapid electrolyte injection research device in an embodiment of the present invention. The battery rapid electrolyte injection research device is used for detachably installing the cell electrode group 5 inside. The battery rapid electrolyte injection research device includes a battery case 1, an injection component 2, and a gas circuit component 3. The battery case 1 is provided with a positive electrode post 1a, a negative electrode post 1b, and a closable installation port 1c for internal disassembly and assembly connection with the positive and negative electrodes of the cell electrode group 5. The battery case 1 serves as a container for accommodating the cell electrode group 5. The cell electrode group 5 is installed inside the battery case 1. The positive and negative electrodes on the cell electrode group 5 are connected to the positive electrode post 1a and the negative electrode post 1b respectively by crimping or other detachable connection methods, and then the installation port 1c is closed to form a sealed space for the internal cell electrode group 5, forming a battery matrix, which can be used as an experimental matrix. Then, electrolyte is injected into it, and the infiltration and dispersion of the electrolyte can be studied; the injection component 2 is installed on the battery case 1 and has an injection end 201 for injecting electrolyte into the interior of the battery case 1, used for injecting electrolyte into the interior of the battery case 1 and infiltrating the cell electrode group 5; the gas circuit component 3 is installed on the battery case 1 and has a gas circuit end 301 for adjusting the air pressure inside the battery case 1, used for evacuating or injecting gas under pressure into the interior of the battery case 1, and can evacuate the interior of the battery case 1 or apply pressure.

[0023] In this embodiment, when the gas path component 3 creates a negative pressure environment to evacuate the battery housing 1, a negative pressure is formed inside the battery cell, and the external electrolyte is quickly injected under the action of the pressure difference, completing the liquid injection quickly, shortening the time, and using the negative pressure to accelerate the penetration of the electrolyte into the pores of the electrode sheet; pressurization can ensure that the electrolyte fully wets the electrode sheet and reduce the ionic transport resistance. The gas path component 3 can adjust the negative pressure and pressurization conditions according to the actual research needs, facilitating the research on rapid battery liquid injection.

[0024] Among them, the battery housing 1 with different internal space sizes can be processed according to the changes in the thickness of the electrode group 5 of the research battery cell and the requirements of the assembly ratio.

[0025] It can be understood that when conducting rapid liquid injection research, only the electrode group 5 of the battery cell needs to be inserted into the battery housing 1 through the installation port 1c, and its positive and negative electrodes are connected and conducted with the positive electrode post 1a and the negative electrode post 1b, and the installation port 1c is closed, then a power battery experimental body for research can be formed. At this time, the negative pressure liquid injection and pressurization operations can be simulated through the liquid injection component 2 and the gas path component 3. The positive electrode post 1a and the negative electrode post 1b are connected to the charge and discharge cabinet for power supply. After the test discharge is completed, the electrode group 5 of the battery cell is taken out, and the device is wiped, dried, and can be used continuously, realizing reusable.

[0026] In one of the embodiments, please refer to Figure 1 , to facilitate the disassembly, assembly, and handling of the electrode group 5 of the battery cell and enable the device to be reused for rapid battery liquid injection research, the battery housing 1 includes a first housing 11, a second housing 12, and a sealing component 13. The installation port 1c is provided on one side of the first housing 11 for the electrode group 5 of the battery cell to be inserted and removed. The installation port 1c can be on any side of the first housing 11, and its size can allow the electrode group 5 of the battery cell to be inserted and withdrawn. Correspondingly, to close the installation port 1c, the second housing 12 is detachably connected to the installation port 1c to form a closed internal space that houses the electrode group 5 of the battery cell. The second housing 12 can serve as a cover plate for the installation port 1c to close the installation port 1c. To provide good sealing during closing, the sealing component 13 is arranged between the first housing 11 and the second housing 12 to seal the gap between the first housing 11 and the second housing 12.

[0027] Further, to facilitate the connection between the battery cell electrode group 5 and the positive electrode post 1a and the negative electrode post 1b, and to facilitate the subsequent insertion and sealing with the first housing 11, both the positive electrode post 1a and the negative electrode post 1b are installed on the second housing 12. At this time, before the battery cell electrode group 5 is inserted into the first housing 11, it can be connected and assembled with the positive electrode post 1a and the negative electrode post 1b on the second housing 12. After assembly, the battery cell electrode group 5 is inserted into the interior of the first housing 11, and the second housing 12 is used to cover the installation opening 1c to form a closed internal space for accommodating the battery cell electrode group 5.

[0028] It can be understood that the positive electrode post 1a and the negative electrode post 1b can also be installed on the first housing 11. After the battery cell electrode group 5 is inserted into the first housing 11 and connected to the positive electrode post 1a and the negative electrode post 1b, the second housing 12 is installed. Both methods are acceptable. In terms of operation, when not inserted into the first housing 11, the operating space is larger, which is more convenient for connecting the positive and negative electrodes of the battery cell electrode group 5 to the positive electrode post 1a and the negative electrode post 1b.

[0029] In one embodiment, please refer to Figure 1 and Figure 2 , to provide effective sealing when the first housing 11 is connected to the second housing 12, the sealing assembly 13 includes a sealing rubber ring 13a. One side of the first housing 11 corresponding to the installation opening 1c is provided with a sealing ring groove 13b. The sealing rubber ring 13a is inserted into the sealing ring groove 13b. During installation, the sealing rubber ring 13a is first inserted into the sealing ring groove 13b, and then the second housing 12 is installed to press the sealing rubber ring 13a between the first housing 11 and the second housing 12 to form a seal at the connection gap.

[0030] It can be understood that the number of sealing ring grooves 13b is at least one. Multiple coaxially arranged sealing ring grooves 13b can be used to match multiple sealing rubber rings 13a to form a multi-layer sealing structure inside and outside.

[0031] Further, the connection method between the first housing 11 and the second housing 12 is bolt connection. By setting at least four bolts, the four corners of the first housing 11 and the second housing 12 are locked and pressed to tightly press the opposite end faces of the first housing 11 and the second housing 12, thereby tightly pressing the sealing rubber ring 13a located at this end face to form a seal.

[0032] It can be understood that using bolt connection between the first housing 11 and the second housing 12 is only one feasible way of sustainable connection. Other detachable structures such as snap connection can be used between the first housing 11 and the second housing 12 to achieve the same connection effect, and it is not uniquely limited here.

[0033] In one embodiment, please refer to Figure 1 andFigure 3 In order to facilitate the connection between the battery cell group 5 and the battery casing 1, the positive electrode column 1a and the negative electrode column 1b both penetrate the inside and outside of the battery casing 1, and a drain plate 1d is extended at one end located inside the battery casing 1. The drain plates 1d are screwed one by one on the positive and negative electrodes of the battery cell group 5 for conducting current.

[0034] Among them, the positive electrode column 1a and the negative electrode column 1b are both installed through the through grooves opened on the battery shell 1, and the sealing glue is glued in the through grooves of the battery shell 1 through which the electrodes pass, so as to fix the positive electrode column 1a and the negative electrode column 1b on the battery shell 1.

[0035] In the present embodiment, a connection method between the battery cell group 5 and the second shell 12 is adopted. Specifically, the positive electrode column 1a and the negative electrode column 1b both penetrate the second shell 12. A positive electrode ear and a negative electrode ear are provided on the top of the battery cell group 5, which are respectively connected to the positive electrode column 1a and the negative electrode column 1b by screw crimping. Through the crimping method, the contact resistance between the electrode ears of the battery cell group 5 and the positive electrode column 1a and the negative electrode column 1b can be ignored, thereby achieving current conduction.

[0036] It is understandable that the connection method between the positive and negative electrodes of the battery cell group 5 and the positive electrode column 1a and the negative electrode column 1b can also adopt a snap-on adapter, elastic clamping, plug-in type and other connection methods with a detachable structure, which is not limited here.

[0037] In one embodiment, see Figure 1 In order to facilitate observation of the infiltration and dispersion of the electrolyte, the battery housing 1 is a transparent housing. The battery housing 1 is made of transparent material, which is easy to observe and study the infiltration and dispersion process of the electrolyte within a short period of time after the start of injection.

[0038] It can be understood that, among the first shell 11 and the second shell 12 , the first shell 11 can be a transparent shell, but the first shell 11 does not necessarily have to be a transparent shell. Accordingly, it is only necessary that the observable area can cover the electrolyte coverage range of the entire battery cell group 5 .

[0039] In one embodiment, see Figure 1 and Figure 4 In order to detect the pressure change during the internal liquid injection process, it also includes a pressure detection mechanism 4, which is installed on the battery shell 1 and has a detection end 401 for detecting the pressure value change inside the battery shell 1. By detecting the pressure value change inside the battery shell 1, the implementation of vacuuming and pressurization can be fed back.

[0040] Among them, the pressure detection mechanism 4 includes a pressure sensor 41 installed on the battery housing 1. The pressure sensor 41 is screwed into the threaded hole 1e above the second housing 12 and sealed with sealant to achieve sealing and fixation. That is, the detection end 401 is the pressure sensor 41.

[0041] In one embodiment, please refer to Figure 1 , in order to hermetically install the detection end 401, the liquid injection end 201, and the gas path end 301 during assembly, threaded holes 1e corresponding to the detection end 401, the liquid injection end 201, and the gas path end 301 are provided on the battery housing 1. External threads are provided on the outer sides of the detection end 401, the liquid injection end 201, and the gas path end 301, and they are connected to the corresponding threaded holes 1e through the external threads. A sealant is provided between the threaded hole 1e and the corresponding external thread. The various ports are connected through a threaded structure, and the port connections are sealed and fixed with sealant.

[0042] Furthermore, the liquid injection assembly 2 includes a liquid supply mechanism and a liquid injection valve 21. The liquid injection valve 21 is detachably installed on the battery housing 1, and the liquid supply mechanism is detachably connected to the liquid injection valve 21 for supplying electrolyte. That is, the liquid injection end 201 is the liquid injection valve 21. The electrolyte is supplied by the liquid supply mechanism and injected into the battery housing 1 through the liquid injection valve 21. The on-off of the liquid injection passage can be controlled by the liquid injection valve 21.

[0043] It can be understood that the liquid supply mechanism can adopt a structure combining a liquid storage tank and a transfer pump. The electrolyte in the liquid storage tank is pumped by the transfer pump and enters the interior of the battery housing 1 through the liquid injection valve 21. And a flow rate sensor is installed at the liquid injection valve 21 to monitor the injection speed.

[0044] Furthermore, the gas path assembly 3 includes a vacuum pump, a pressure gas cylinder, and a gas valve 31. The gas valve 31 is detachably installed on the battery housing 1, and the vacuum pump and the pressure gas cylinder are both detachably connected to the gas valve 31, which are respectively used for vacuum pumping and gas supply and pressurization. That is, the gas path end 301 is the gas valve 31. The vacuum pump and the pressure gas cylinder are respectively provided with corresponding valves to control the on-off with the gas valve 31, and the gas valve 31 controls the on-off between the interior of the battery housing 1 and any gas path.

[0045] It can be understood that when the vacuum pump is connected to the gas valve 31 and the gas valve 31 is opened, the vacuum pump can be started to pump vacuum; when the pressure gas cylinder is connected to the gas valve 31 and the gas valve 31 is opened, the interior of the battery housing 1 can be pressurized. The above vacuum pumping and pressurization methods are only one feasible implementation method and are not limited to this.

[0046] In one embodiment, for the installation and sealing of the corresponding threaded holes 1e, the air valve 31, and the liquid injection valve 21, the assembled device has good sealing performance. First, screw the air valve 31 and the liquid injection valve 21 into the threaded holes 1e on the side of the battery housing. During the screwing process, apply sealant to the threads to prevent air leakage. Similarly, screw the pressure sensor 41 into the threaded hole 1e above the second housing 12 and apply sealant to achieve sealing and fixation. The positive electrode post 1a and the negative electrode post 1b are installed through the through slots opened at the top of the second housing 12, and the sealant is glued in the through slots of the second housing 12 where the electrode posts pass through. After filling the above sealant, let it stand for 24 hours to wait for all kinds of glue to dry completely.

[0047] For a better understanding of the present invention, the following combines Figures 1 to 4 to elaborate on the technical solution of the present invention in detail: In the assembly step, first screw the air valve 31 and the liquid injection valve 21 into the threaded holes 1e on the side of the battery housing 1. During the screwing process, apply sealant to the threads to prevent air leakage. Then screw the pressure sensor 41 into the threaded hole 1e above the second housing 12 and apply sealant to achieve sealing and fixation. Then bond the positive electrode post 1a and the negative electrode post 1b to the through slots of the second housing 12 where the electrode posts pass through with sealant. After filling the sealant, let it stand for 24 hours to wait for all kinds of glue to dry completely; Before the research operation, first press the positive and negative electrode tabs of the battery cell stack 5 onto the current-carrying strips 1d extending downward from the positive electrode post 1a and the negative electrode post 1b. Then place the seal ring 13a into the seal ring groove 13b, insert the battery cell stack 5 into the first housing 11, align the threaded through holes around the second housing 12 with those of the first housing 11, and use bolts to tighten. The entire device is sealed; During the experimental operation, conduct research through the liquid injection assembly 2 and the gas circuit assembly 3 for negative pressure liquid injection and pressurization operations; After the experimental operation, disassemble the second housing 12 and the battery cell stack 5, take out the battery cell stack 5, wipe and dry the device, and it can be used continuously to achieve reusable.

[0048] The present invention also provides a method for researching rapid liquid injection of a battery, which is carried out by using the battery rapid liquid injection research device described in any one of the above embodiments, and includes the following steps: Place the battery cell stack 5 inside the battery housing 1, and press its positive and negative electrodes onto the positive electrode post 1a and the negative electrode post 1b of the battery housing 1 respectively; Connect the positive electrode post 1a and the negative electrode post 1b to the charge and discharge cabinet, close the liquid injection assembly 2, and open the gas circuit assembly 3 to evacuate; After evacuating, close the gas circuit assembly 3, and then open the liquid injection assembly 2 to inject electrolyte into the inside of the battery housing 1; After all the electrolyte is injected, close the liquid injection assembly 2, open the gas circuit assembly 3 to inject gas and pressurize, and supply the electrolyte to infiltrate and disperse; After the test discharge is completed, take out the battery cell stack 5, wipe and dry the device for repeated use.

[0049] Specifically, before the above steps, it is also necessary to perform an airtightness test on the device. As Figure 2 shown, there is a sealing ring groove 13b above the first housing 11. Place the sealing rubber ring 13a into the groove, and as Figure 1 place the second housing 12 on the first housing 11, align the threaded through holes around, and use bolts to press the device tightly to achieve internal sealing. Then turn on the pressure sensor 41, close the liquid injection valve 21, open the air valve 31, and perform a vacuum pumping operation on the inside of the device. After the vacuum pumping is completed, close the open air valve 31 and observe the change in the vacuum degree of the pressure sensor 41. If the airtightness is not good, find the leakage point, fill the leakage point with sealant, and then continue to perform the airtightness test operation until the airtightness is good.

[0050] Furthermore, when conducting rapid liquid injection research, as Figure 3 shown, press the positive and negative electrode tabs of the battery cell stack 5 onto the current-carrying strips 1d extending below the positive electrode post 1a and the negative electrode post 1b. There are threaded holes below the positive electrode post 1a and the negative electrode post 1b. By pressing, the contact resistance between the tabs of the battery cell stack 5 and the positive electrode post 1a and the negative electrode post 1b can be ignored, thus achieving current conduction. Then place the sealing rubber ring 13a into the sealing ring groove 13b, align the second housing 12 with the first housing 11 and the threaded through holes around, and use bolts to press tightly, and the entire device is sealed. After sealing, connect the positive electrode post 1a and the negative electrode post 1b to the charge and discharge cabinet to provide voltage, the air pressure is provided by the air circuit component, the liquid injection volume is provided by the liquid injection component, and the liquid injection speed is also provided by the liquid injection component. At this time, rapid liquid injection research can be carried out. As Figure 4 shown, connect the liquid injection valve 21 to the liquid supply mechanism and close it. Open the valve of the air valve 31, evacuate the device, close the air valve 31 after the evacuation is completed, and then the air valve 31 is connected to the pressure gas cylinder. Open the liquid injection valve 21, start the liquid supply mechanism, inject the electrolyte, close the liquid injection valve 21 after all the electrolyte is injected, open the air valve 31 connected to the pressure gas cylinder, and perform a pressurization operation on the entire device. After the test discharge is completed, take out the battery cell stack 5, wipe and dry the device, and it can be used continuously to achieve reusable.

[0051] The specific implementation manners of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A rapid battery liquid injection research device for removably and internally mounting a cell electrode group, characterized in that, Comprising: A battery housing, on which a positive terminal, a negative terminal, and a closable mounting port are provided, for internal disassembly and assembly for docking with the positive and negative electrodes of the battery cell group; A liquid injection assembly, which is installed on the battery housing and has a liquid injection end for injecting electrolyte into the interior of the battery housing; And A gas path assembly, which is installed on the battery housing and has a gas path end for adjusting the air pressure inside the battery housing.

2. The battery rapid liquid injection research device according to claim 1, characterized in that, The battery housing includes a first housing, a second housing, and a sealing assembly. The mounting port is provided on one side of the first housing for the battery cell group to be inserted and removed. The second housing is detachably connected to the mounting port to form an internal space for closing and accommodating the battery cell group. The sealing assembly is arranged between the first housing and the second housing for sealing the gap between the first housing and the second housing.

3. The battery rapid liquid injection research device according to claim 2, wherein The sealing assembly includes a sealing rubber ring. A sealing ring groove is provided on the side of the first housing corresponding to the mounting port, and the sealing rubber ring is inserted into the sealing ring groove.

4. The battery rapid liquid injection research device according to claim 1, wherein Both the positive terminal and the negative terminal penetrate inside and outside the battery housing, and a current guiding sheet extends at one end inside the battery housing. The current guiding sheets are respectively screwed and pressed onto the positive and negative electrodes of the battery cell group for conducting current.

5. The battery rapid liquid injection research device according to claim 1, characterized in that, The battery housing is a transparent housing.

6. The battery rapid liquid injection research device according to claim 1, characterized in that, It further includes a pressure detection mechanism, which is installed on the battery housing and has a detection end for detecting changes in the internal pressure value of the battery housing.

7. The battery rapid liquid injection research device according to claim 6, wherein, Threaded holes corresponding to the detection end, the liquid injection end, and the gas path end are provided on the battery housing. External threads are provided on the outside of the detection end, the liquid injection end, and the gas path end, and are connected to the corresponding threaded holes through the external threads. And a sealing glue is provided between the threaded holes and the corresponding external threads.

8. The battery rapid liquid injection research device according to claim 1, characterized in that, The liquid injection assembly includes a liquid supply mechanism and a liquid injection valve. The liquid injection valve is detachably installed on the battery housing, and the liquid supply mechanism is detachably connected to the liquid injection valve for supplying electrolyte.

9. The battery rapid liquid injection research device according to claim 1, characterized in that The gas path assembly includes a vacuum pump, a pressure gas cylinder, and a gas valve. The gas valve is detachably installed on the battery housing, and both the vacuum pump and the pressure gas cylinder are detachably connected to the gas valve, respectively for vacuum pumping and gas supply and pressurization.

10. A research method for rapid battery liquid injection, characterized in that, Using the battery rapid liquid injection research device according to any one of claims 1-9, comprising the following steps: The battery cell group is installed inside the battery housing, and its positive and negative electrodes are respectively pressed onto the positive terminal and the negative terminal of the battery housing; Connect the positive terminal and the negative terminal to a charge and discharge cabinet, close the liquid injection assembly, and turn on the gas path assembly to pump vacuum; After pumping vacuum, close the gas path assembly, and then turn on the liquid injection assembly to inject electrolyte into the interior of the battery housing; After all the electrolyte is injected, close the liquid injection assembly, turn on the gas path assembly to inject gas and pressurize, to supply the electrolyte to infiltrate and disperse; After the test discharge is completed, take out the battery cell group, wipe and dry the device for repeated use.

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