Method and device for detecting liquid injection amount in real time

Abstract

The invention discloses a method and device for detecting the liquid injection amount in real time, and the method comprises the steps: S1, preparing a liquid storage cup with scales, and enabling the liquid storage cup to contain a preset amount of electrolyte in advance; s2, the liquid storage cup is communicated with a liquid injection opening of the cylindrical battery through a sealed connecting device capable of controlling the flow, and it is ensured that electrolyte can freely flow between the liquid storage cup and the liquid injection opening and cannot leak; s3, controlling the electrolyte to be injected from the liquid storage cup to the liquid injection port of the cylindrical battery until the electrolyte amount required by the battery cell or a preset injection condition is reached; s4, in the electrolyte injection process, continuously observing and recording the variable quantity of the electrolyte liquid level in the liquid storage cup, the variable quantity directly corresponding to the quantity of the electrolyte injected into the cylindrical battery cell; and S5, according to the recorded electrolyte liquid level change quantity. According to the invention, real pore data is provided for cell design, the operation is simple, multiple liquid injection can be avoided, and the liquid injection efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production, and in particular to a method and a device for real-time detection of liquid injection volume. Background Art

[0002] At present, the theoretical filling amount of cylindrical batteries is determined according to the theoretical porosity of the material. The theoretical calculated value is prone to deviation and is related to the expansion of the electrode during the charging process of the battery cell. At present, it is impossible to confirm the amount of electrolyte required for the battery cell under different SOCs. Therefore, when injecting the electrolyte, the electrolyte is easy to bubble out, which is troublesome to wipe and the battery has a low liquid retention capacity. Summary of the invention

[0003] In view of the above-mentioned problems existing in the liquid injection amount of existing cylindrical batteries, the present invention aims to provide a method and a device for real-time detection of the liquid injection amount which can improve the liquid injection efficiency, is simple to operate and can accurately inject liquid.

[0004] The specific technical solutions are as follows:

[0005] A method for real-time detection of liquid injection volume, the method comprising:

[0006] S1: preparing a liquid storage cup with a scale, wherein the liquid storage cup is pre-filled with a predetermined amount of electrolyte;

[0007] S2: connecting the liquid storage cup to the liquid filling port of the cylindrical battery through a sealed and flow-controllable connecting device to ensure that the electrolyte can flow freely between the two without leakage;

[0008] S3: Control the electrolyte to be injected from the liquid storage cup into the injection port of the cylindrical battery until the amount of electrolyte required by the battery cell or the preset injection condition is reached;

[0009] S4: During the electrolyte injection process, continuously observe and record the change in the electrolyte level in the storage cup, which directly corresponds to the amount of electrolyte injected into the cylindrical battery cell;

[0010] S5: Based on the recorded electrolyte level change, the exact amount of electrolyte required for the cylindrical battery cell is calculated to complete the measurement.

[0011] As a further improvement and optimization of this solution, the liquid storage cup is provided with an exhaust pipe, one end of the exhaust pipe is connected to the liquid filling port of the cylindrical battery, and the other end extends into the liquid storage cup.

[0012] As a further improvement and optimization of this solution, the other end of the exhaust pipe extends to above the electrolyte level in the liquid storage cup.

[0013] As a further improvement and optimization of this solution, one end of the exhaust pipe passes through the bottom of the liquid storage cup.

[0014] As a further improvement and optimization of this solution, a liquid injection nozzle is also provided on the liquid storage cup.

[0015] As a further improvement and optimization of this solution, the liquid injection nozzle is arranged on the top of the liquid storage cup.

[0016] As a further improvement and optimization of the present solution, the connecting device includes a liquid injection tube disposed at the bottom of the liquid storage cup, and the liquid injection tube is connected to the liquid injection port of the cylindrical battery.

[0017] As a further improvement and optimization of this solution, the injection tube is coaxially arranged with the liquid storage cup.

[0018] As a further improvement and optimization of this solution, the injection pipe is arranged in parallel with the exhaust pipe.

[0019] As a further improvement and optimization of the present solution, the bottom end height of the injection pipe is lower than the bottom end height of the exhaust pipe.

[0020] A device for real-time detection of injection volume is applied to the above-mentioned method.

[0021] Compared with the prior art, the above technical solution has the following positive effects:

[0022] The present invention connects a liquid storage cup with a scale and containing electrolyte with the liquid filling port of a cylindrical battery, and measures the amount of electrolyte required for the battery cell in the cylindrical battery by recording the change in the electrolyte in the liquid storage cup. This not only provides real pore data for battery cell design, but also is simple to operate, can avoid multiple injections, and improves injection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a liquid storage cup of a method and device for real-time detection of liquid injection volume of the present invention;

[0024] In the attached figure: 1. liquid storage cup; 2. liquid filling tube; 3. exhaust pipe; 4. scale; 5. liquid filling nozzle. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0026] Figure 1 FIG. 1 is a schematic diagram of the structure of a liquid storage cup of a method and device for real-time detection of liquid injection volume of the present invention, as shown in FIG. Figure 1As shown, a method for real-time detection of injection volume in a preferred embodiment is shown, and the method includes: S1: preparing a liquid storage cup 1 with a scale 4, and the liquid storage cup 1 is pre-filled with a predetermined amount of electrolyte; S2: connecting the liquid storage cup 1 with the injection port of the cylindrical battery through a sealed and flow-controllable connecting device to ensure that the electrolyte can flow freely between the two without leakage; S3: controlling the electrolyte to be injected from the liquid storage cup 1 to the injection port of the cylindrical battery until the electrolyte volume required by the battery cell or the preset injection condition is reached; S4: during the electrolyte injection process, continuously observing and recording the change in the electrolyte level in the liquid storage cup 1, which directly corresponds to the amount of electrolyte injected into the cylindrical battery cell; S5: calculating the exact amount of electrolyte required for the cylindrical battery cell based on the recorded electrolyte level change, thereby completing the measurement.

[0027] In this embodiment, a storage cup 1 having a scale 4 and containing electrolyte is connected to the injection port of the cylindrical battery. By recording the change in the electrolyte in the storage cup 1, the amount of electrolyte required for the battery cell in the cylindrical battery is measured. This not only provides real pore data for battery cell design, but also is simple to operate, can avoid multiple injections, and improve injection efficiency.

[0028] Furthermore, as a preferred embodiment, the liquid storage cup 1 is provided with an exhaust pipe 3 , one end of the exhaust pipe 3 is connected to the liquid filling port of the cylindrical battery, and the other end extends into the liquid storage cup 1 .

[0029] Furthermore, as a preferred embodiment, the other end of the exhaust pipe 3 extends to above the electrolyte level in the liquid storage cup 1. When the electrolyte is injected into the cylindrical battery, the internal air can be discharged from the exhaust pipe 3 into the cavity above the electrolyte in the liquid storage cup 1 as the injection amount increases, thereby further accurately determining the optimal injection amount of the cylindrical battery.

[0030] Furthermore, as a preferred embodiment, one end of the exhaust pipe 3 passes through the bottom of the liquid storage cup 1 .

[0031] Furthermore, as a preferred embodiment, the liquid storage cup 1 is also provided with a liquid injection nozzle 5.

[0032] Furthermore, as a preferred embodiment, the liquid injection nozzle 5 is arranged on the top of the liquid storage cup 1.

[0033] Furthermore, as a preferred embodiment, the connecting device includes a liquid injection tube 2 arranged at the bottom of the liquid storage cup 1, and the liquid injection tube 2 is connected to the liquid injection port of the cylindrical battery.

[0034] Furthermore, as a preferred embodiment, the liquid injection tube 2 and the liquid storage cup 1 are coaxially arranged.

[0035] Furthermore, as a preferred embodiment, the liquid injection pipe 2 and the exhaust pipe 3 are arranged in parallel.

[0036] Furthermore, as a preferred embodiment, the bottom end height of the liquid injection pipe 2 is lower than the bottom end height of the exhaust pipe 3 .

[0037] In a preferred embodiment, the connecting device also includes a regulating valve arranged on the injection pipe 2 for controlling the flow in the injection pipe 2, and also includes a sealing structure arranged on the injection pipe 2 and the exhaust pipe 3 for sealing between the injection port of the cylindrical battery. The sealing structure can be made of rubber material.

[0038] A device for real-time detection of liquid injection volume is applied to the above-mentioned method, and the device includes a liquid storage cup 1 and an exhaust pipe 3, a liquid injection pipe 2, and a liquid injection nozzle 5 arranged on the liquid storage cup 1.

[0039] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for real-time detection of injection volume, characterized in that: The method comprises: S1: preparing a liquid storage cup with a scale, wherein the liquid storage cup is pre-filled with a predetermined amount of electrolyte; S2: connecting the liquid storage cup to the liquid filling port of the cylindrical battery through a sealed and flow-controllable connecting device to ensure that the electrolyte can flow freely between the two without leakage; S3: Control the electrolyte to be injected from the liquid storage cup into the injection port of the cylindrical battery until the amount of electrolyte required by the battery cell or the preset injection condition is reached; S4: During the electrolyte injection process, continuously observe and record the change in the electrolyte level in the storage cup, which directly corresponds to the amount of electrolyte injected into the cylindrical battery cell; S5: Based on the recorded electrolyte level change, the exact amount of electrolyte required for the cylindrical battery cell is calculated to complete the measurement.

2. The method for real-time detection of injection volume according to claim 1, characterized in that: The liquid storage cup is provided with an exhaust pipe, one end of which is connected to the liquid injection port of the cylindrical battery, and the other end of which extends into the liquid storage cup.

3. The method for real-time detection of injection volume according to claim 2, characterized in that: The other end of the exhaust pipe extends to above the electrolyte level in the liquid storage cup.

4. The method for real-time detection of injection volume according to claim 3, characterized in that: One end of the exhaust pipe passes through the bottom of the liquid storage cup.

5. The method for real-time detection of injection volume according to claim 1, characterized in that: The liquid storage cup is also provided with a liquid injection nozzle; The liquid injection nozzle is arranged on the top of the liquid storage cup.

6. The method for real-time detection of injection volume according to claim 5, characterized in that: The connecting device comprises a liquid injection tube arranged at the bottom of the liquid storage cup, and the liquid injection tube is connected to the liquid injection port of the cylindrical battery.

7. The method for real-time detection of injection volume according to claim 6, characterized in that: The liquid injection tube is coaxially arranged with the liquid storage cup.

8. The method for real-time detection of injection volume according to claim 6, characterized in that: The liquid injection pipe is arranged in parallel with the exhaust pipe.

9. The method for real-time detection of injection volume according to claim 8, characterized in that: The bottom end height of the liquid injection pipe is lower than the bottom end height of the exhaust pipe.

10. A device for real-time detection of injection volume, characterized in that: The method as claimed in any one of claims 1 to 9.

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