A portable lithium battery liquid injection device

Abstract

This utility model discloses a portable lithium battery electrolyte filling device, comprising: an electrolyte temporary storage chamber assembly, an adapter assembly, and an electrolyte filling buffer chamber assembly. The adapter assembly is equipped with an electrolyte injection valve and a vacuum valve. One end of the electrolyte temporary storage chamber assembly is equipped with a connecting assembly connected to the electrolyte injection valve. The electrolyte temporary storage chamber assembly has a temporary storage cavity that is electrically connected to the connecting assembly. The electrolyte filling buffer chamber assembly is electrically connected to the adapter assembly and is equipped with an electrolyte filling assembly. This portable lithium battery electrolyte filling device improves filling efficiency, is easy to carry, and is simple to operate. It can realize small-batch battery trial production or post-process electrolyte replenishment, and can improve the accuracy of electrolyte filling weight. It can directly insert into the battery for sealed electrolyte filling, and there will be no electrolyte splashing or overflow.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery liquid filling technology, and in particular to a portable lithium battery liquid filling device. Background Technology

[0002] In the electrolyte replenishment process after battery pre-charge activation, for routine production, electrolyte replenishment is usually done manually using a syringe or by re-inserting the battery into the production line to allow it to flow into an automated electrolyte filling machine. However, in small-batch battery trial production or post-process electrolyte replenishment scenarios, while using a large electrolyte filling machine can meet certain electrolyte filling requirements, the high operating costs make it uneconomical for small-batch production.

[0003] Currently, battery electrolyte filling commonly uses an open-type filling method. During the filling process, due to the lack of effective protection and precise control, electrolyte is highly susceptible to splashing and overflow. This splashing not only wastes electrolyte and increases production costs, but more seriously, it contaminates the battery filling seal. Once the seal is contaminated, the welding quality in subsequent post-filling sealing processes is greatly affected, easily leading to poor sealing. Poor sealing can cause leakage during battery use, severely impacting battery safety and lifespan, becoming a key factor restricting the improvement of battery production quality and efficiency. Utility Model Content

[0004] To address the issues of high cost and potential splashing problems associated with using large-scale liquid injection machines for small-batch battery liquid replenishment in existing technologies, this invention proposes a portable lithium battery liquid injection device.

[0005] The specific technical solution is as follows:

[0006] A portable lithium battery electrolyte filling device includes: an electrolyte temporary storage chamber assembly, an adapter assembly, and an electrolyte filling buffer chamber assembly. The adapter assembly is provided with an electrolyte injection valve and a vacuum valve. One end of the electrolyte temporary storage chamber assembly is provided with a connecting assembly connected to the electrolyte injection valve. The electrolyte temporary storage chamber assembly has a temporary storage cavity that is conductive to the connecting assembly. The electrolyte filling buffer chamber assembly is conductively connected to the adapter assembly and is provided with an electrolyte filling assembly.

[0007] Furthermore, the electrolyte storage chamber assembly is provided with an injection pump connector that is connected to the storage chamber.

[0008] Furthermore, the adapter assembly is equipped with a nitrogen injection valve.

[0009] Furthermore, the adapter assembly is provided with a three-way pipe, and the nitrogen injection valve and the vacuum valve are respectively located on one branch of the three-way pipe.

[0010] Furthermore, the adapter assembly is equipped with a vacuum pressure gauge.

[0011] Furthermore, the adapter assembly has an opening on one side and an internal thread on its inner wall; the liquid injection buffer chamber assembly has an opening on one side and an external thread on its opening side that engages with the internal thread for sealing connection.

[0012] Furthermore, the liquid injection buffer assembly has a liquid collection platform on the open side, and the liquid collection platform has a through hole.

[0013] Furthermore, both the electrolyte temporary storage chamber assembly and the electrolyte injection buffer chamber assembly are equipped with electrolyte observation windows.

[0014] Furthermore, the electrolyte observation window is fixed by an observation window pressure plate.

[0015] Furthermore, the injection component is an injection needle.

[0016] The above technical solution has the following advantages or technical effects:

[0017] 1. This utility model, through the design of a portable lithium battery electrolyte filling device, enables flexible operation for small-batch battery trial production or subsequent electrolyte replenishment. Compared to the high equipment cost, space occupation, and maintenance costs of traditional large-scale electrolyte filling machines, this device is compact, low-cost, and can be quickly deployed, making it particularly suitable for small-batch trial production or local electrolyte replenishment needs in the R&D stage or production line.

[0018] 2. This utility model adopts a small, simple and reliable device with a controllable valve and injection needle, which can realize small-batch battery trial production or subsequent liquid replenishment. Compared with the use of manual syringes for liquid injection, it can improve the accuracy of liquid injection weight.

[0019] 3. The device of this utility model is directly inserted into the battery for sealed liquid injection. The sealed liquid injection structure has the injection needle directly inserted into the battery to form a closed space. During the liquid injection process, the electrolyte is completely isolated from the outside world. Compared with the existing open liquid injection, there will be no splashing or overflow of electrolyte, eliminating the risk of splashing, evaporation or leakage. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the electrolyte storage tank assembly of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the adapter assembly of this utility model;

[0023] Figure 4 This is a schematic diagram of the open side structure of the adapter assembly of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the liquid injection buffer chamber assembly of this utility model;

[0025] Figure 6 This is a cross-sectional view of the liquid injection buffer chamber assembly of this utility model.

[0026] The attached diagram is labeled as follows: 1-Electrolyte temporary storage tank assembly, 1.1-Injection pump connector, 1.2-Connecting assembly, 2-Adapter assembly, 2.1-Electrolyte injection valve, 2.2-Vacuum valve, 2.3-Nitrogen injection valve, 2.4-Vacuum pressure gauge, 2.5-Internal thread, 3-Injection buffer tank assembly, 3.1-Injection assembly, 3.2-External thread, 3.3-Collection platform, 4-Electrolyte observation window, 5-Observation window pressure plate. Detailed Implementation

[0027] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 As shown, a portable lithium battery electrolyte filling device includes: an electrolyte storage chamber assembly 1, an adapter assembly 2, and an electrolyte filling buffer chamber assembly 3. The adapter assembly 2 is provided with an electrolyte injection valve 2.1 and a vacuum valve 2.2. One end of the electrolyte storage chamber assembly 1 is provided with a connecting component 1.2 connected to the electrolyte injection valve 2.1. The electrolyte storage chamber assembly 1 is provided with a storage cavity that is in communication with the connecting component 1.2. The electrolyte filling buffer chamber assembly 3 is in communication with the adapter assembly 2 and is provided with an electrolyte filling component 3.1.

[0029] Because electrolytes are highly hydrophilic, a sealed electrolyte filling process is necessary. To address the problems of high costs associated with large-scale electrolyte filling machines or inaccurate filling volumes due to manual methods in the small-batch development, trial production, and mass production electrolyte replenishment processes of new lithium batteries, this invention proposes a portable lithium battery electrolyte filling device. The device includes an electrolyte temporary storage chamber assembly 1 connected to an electrolyte pump for quantitative electrolyte filling and sealed temporary storage. It also features vacuuming and insertion-type injection functions, and is small in size, low in manufacturing cost, and easy to operate.

[0030] like Figure 2As shown, the electrolyte storage chamber assembly 1 is equipped with an injection pump connector 1.1 connected to the pump pipe of the injection pump. The injection pump draws a fixed amount of electrolyte, which enters the buffer chamber of the electrolyte storage chamber assembly 1 through the injection pump connector 1.1. A connecting component 1.2 is provided at the lower end of the buffer chamber. The electrolyte storage chamber assembly 1 is equipped with an electrolyte observation window 4 for viewing the electrolyte level. The electrolyte observation window 4 is made of tempered glass, with a sealing ring at the edge and is secured to the chamber wall of the electrolyte storage chamber assembly 1 by screws using an observation window pressure plate 5.

[0031] like Figure 3 As shown, the adapter assembly 2 includes a vacuum pressure gauge 2.4, an electrolyte injection valve 2.1, a vacuum valve 2.2, and a nitrogen injection valve 2.3. The vacuum pressure gauge 2.4 and the electrolyte injection valve 2.1 are mounted on the main body of the adapter assembly 2. The main body of the adapter assembly 2 is a hollow part that is open at one end and closed at the other end. Figure 4 As shown, the inner wall of the adapter assembly 2 on the open side is provided with an internal thread 2.5 for connecting the liquid injection buffer tank assembly 3. The electrolyte injection valve 2.1 is located at the closed end of the adapter assembly 2 and is connected to the connecting assembly 1.2. The adapter assembly 2 is connected to a vacuum valve 2.2 and a nitrogen injection valve 2.3, or is connected to a vacuum valve 2.2 and a nitrogen injection valve 2.3 through a three-way pipe. A vacuum pressure gauge 2.4 is used to monitor the vacuum status of the vacuum valve 2.2.

[0032] like Figure 5 As shown, the electrolyte filling buffer assembly 3 has an opening on one side, and the opening side has an external thread 3.2 that seals with the internal thread 2.5 of the adapter assembly 2. The pitch of the internal thread 2.5 and the external thread 3.2 is 1mm. After the electrolyte filling buffer assembly and the adapter assembly 2 are screwed together, a buffer cavity is formed. The lower end of the electrolyte filling buffer assembly 3 has a boss, and the electrolyte filling component 3.1 is an injection needle. The injection needle is mounted on the boss, and the boss has a through hole. The injection needle communicates with the buffer cavity through the through hole of the boss. During operation, the injection needle is directly inserted into the battery to perform vacuuming, electrolyte filling, and nitrogen injection for pressurization.

[0033] The electrolyte buffer chamber assembly 3 is equipped with an electrolyte observation window 4 for viewing the electrolyte level. The electrolyte observation window 4 is made of tempered glass, with a sealing ring on the edge and is fastened to the chamber wall of the electrolyte buffer chamber assembly 3 by screws using an observation window pressure plate 5.

[0034] like Figure 6As shown, the electrolyte injection buffer chamber assembly 3 has a collection platform 3.3 on its open side. The collection platform 3.3 has a conical groove on its open side for quickly collecting the electrolyte flowing into the temporary storage chamber when the electrolyte injection valve 2.1 is opened. The collection platform 3.3 has a through hole, so that the temporary storage chamber is connected to the buffer chamber when the electrolyte injection valve 2.1 is opened. The electrolyte injection buffer chamber assembly 3 has a conical collection groove at the injection needle installation position, so that the electrolyte in the buffer chamber enters the injection needle.

[0035] In actual use, the device of this utility model performs the following operations for electrolyte injection: Check all valves of the device to ensure that all valves are closed; insert the injection component 3.1 into the battery that needs to be replenished; inject a certain amount of electrolyte into the electrolyte storage chamber component 1 using the injection pump; turn on the vacuum pump, and when the vacuum pressure gauge 2.4 shows -98Kpa, close the vacuum valve 2.2; open the electrolyte injection valve 2.1, and the electrolyte in the storage chamber enters the buffer chamber under the action of pressure difference, and gradually flows into the battery casing through the injection component 3.1, waiting for pressure balance; close the electrolyte injection valve 2.1, open the nitrogen injection valve 2.3 to force all the electrolyte into the battery, and wait for pressure balance; close the nitrogen injection valve 2.3, and re-vacuum through the vacuum valve 2.2 until the vacuum pressure gauge 2.4 shows -98Kpa, then close the vacuum valve 2.2; open the electrolyte injection valve 2.1, and inject electrolyte again; repeat the above steps until electrolyte injection is complete.

[0036] This invention utilizes a pre-filled electrolyte buffer to improve filling efficiency, and the electrolyte remains within a sealed cavity, preventing exposure and moisture absorption that could affect battery performance. The portable tooling is easy to carry and operate, enabling small-batch battery trial production or subsequent electrolyte replenishment. Compared to large-scale filling machines, it effectively reduces lithium battery trial production costs, and compared to manual syringes, it improves filling weight accuracy. Direct insertion into the battery for sealed filling eliminates electrolyte splashing and overflow, unlike existing open-type filling systems.

[0037] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A portable lithium battery electrolyte filling device, characterized in that, include: The electrolyte storage chamber assembly (1), the adapter assembly (2), and the liquid injection buffer assembly (3) are provided. The adapter assembly (2) is provided with an electrolyte injection valve (2.1) and a vacuum valve (2.2). One end of the electrolyte storage chamber assembly (1) is provided with a connecting assembly (1.2) connected to the electrolyte injection valve (2.1). The electrolyte storage chamber assembly (1) is provided with a storage cavity that is connected to the connecting assembly (1.2). The liquid injection buffer assembly (3) is connected to the adapter assembly (2) and is provided with a liquid injection assembly (3.1).

2. The portable lithium battery electrolyte filling device according to claim 1, characterized in that, The electrolyte storage chamber assembly (1) is provided with an injection pump connector (1.1) that is connected to the storage chamber.

3. The portable lithium battery electrolyte filling device according to claim 1, characterized in that, The adapter assembly (2) is equipped with a nitrogen injection valve (2.3).

4. A portable lithium battery electrolyte filling device according to claim 3, characterized in that, The adapter assembly (2) is provided with a three-way pipe, and the nitrogen injection valve (2.3) and the vacuum valve (2.2) are respectively located on one branch of the three-way pipe.

5. A portable lithium battery electrolyte filling device according to claim 3, characterized in that, The adapter assembly (2) is equipped with a vacuum pressure gauge (2.4).

6. A portable lithium battery electrolyte filling device according to claim 1, characterized in that, The adapter assembly (2) has an opening on one side and an internal thread (2.5) on the inner wall of the adapter assembly (2). The liquid injection buffer chamber assembly (3) has an opening on one side and an external thread (3.2) on the opening side of the liquid injection buffer chamber assembly (3) that is sealed and connected with the internal thread (2.5).

7. A portable lithium battery electrolyte filling device according to claim 6, characterized in that, The liquid injection buffer chamber assembly (3) has a liquid collection platform (3.3) on its open side, and the liquid collection platform (3.3) has a through hole.

8. A portable lithium battery electrolyte filling device according to claim 1, characterized in that, Both the electrolyte storage container assembly (1) and the electrolyte injection buffer assembly (3) are equipped with an electrolyte observation window (4).

9. A portable lithium battery electrolyte filling device according to claim 8, characterized in that, The electrolyte observation window (4) is fixed by the observation window pressure plate (5).

10. A portable lithium battery electrolyte filling device according to claim 1, characterized in that, The injection assembly (3.1) is an injection needle.

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