Battery liquid injection device

Abstract

The utility model discloses a battery liquid injection device which comprises a liquid injection nozzle and a battery shell, a liquid injection channel is arranged on the liquid injection nozzle, a closed cavity structure is arranged in the battery shell, a core body communicated with the liquid injection channel is fixedly connected in the cavity, and the battery shell is internally provided with a liquid injection cavity. At least one flow guide hole is formed in the circumferential direction of the core body in the axis direction of the core body. According to the battery disclosed by the utility model, the battery shell is fixedly connected with the core body communicated with the liquid injection channel, and the flow guide holes are formed in the circumferential direction of the core body, so that the liquid injection efficiency of the battery can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical battery core liquid injection detection equipment, and more specifically to a battery liquid injection device. Background Art

[0002] Cylindrical battery injection is a process of injecting electrolyte into the battery. Its main purpose is to ensure that the concentration and margin of the electrolyte meet the requirements. In view of the current cylindrical battery design, its injection process mainly uses the injection hole reserved in the upper cover plate and cooperates with the external injection needle for injection. However, the traditional battery cell design and injection method can no longer meet the needs of modern production lines. There are mainly the following disadvantages:

[0003] (1) The traditional injection hole is designed on one side of the upper cover plate, not in the center. The battery cell, injection hole and injection needle cannot be coaxial. The automation design is complex and the coordination accuracy is low, which cannot meet the needs of highly streamlined automated production of the production line.

[0004] (2) The traditional injection method is a single-point injection at the top, where the electrolyte is injected from top to bottom, and the single-point penetration rate is slow;

[0005] (3) The traditional cell design of the injection hole can only improve the injection efficiency by increasing the flow rate. Because the method of increasing the flow rate is limited by the slow single-point penetration, the improvement effect is also limited, and the traditional design cannot speed up the injection efficiency through other external physical methods;

[0006] Therefore, due to the limitations of the existing cylindrical battery design, the injection speed of the cylindrical battery cannot be quickly and effectively improved, causing the front and back end equipment to wait, greatly reducing the production efficiency of the battery production line and seriously affecting the daily output benefits of the production line. Utility Model Content

[0007] The technical problem to be solved by the utility model is how to improve the liquid injection efficiency of a cylindrical battery cell.

[0008] The utility model solves the above technical problems through the following technical means: a battery liquid filling device, including a liquid filling nozzle and a battery shell, the liquid filling nozzle is provided with a liquid filling channel, the battery shell is provided with a closed cavity structure, a core body connected to the liquid filling channel is fixedly connected to the cavity, and the core body is circumferentially provided with at least one guide hole arranged along its axial direction.

[0009] As a preferred technical solution, the battery housing is further provided with an air guide channel, and the liquid injection nozzle is further provided with an air extraction channel, and the air extraction channel is connected with the cavity through the air guide channel.

[0010] As a preferred technical solution, a guide prism is provided at one end of the liquid injection nozzle connected to the battery housing, and a central through hole is provided in the liquid injection nozzle and the guide prism, and the central through hole forms the liquid injection channel.

[0011] As a preferred technical solution, an outer tube is fixedly connected to the outer side of the liquid injection nozzle, and the air extraction channel is formed between the outer tube and the liquid injection nozzle.

[0012] As a preferred technical solution, the battery housing comprises a housing, an upper cover plate and a lower cover plate, and the upper cover plate and the lower cover plate are fixedly connected to both ends of the housing respectively.

[0013] As a preferred technical solution, the liquid injection nozzle is detachably connected to the upper cover plate, and a sealing ring is provided at one end of the liquid injection nozzle connected to the upper cover plate.

[0014] As a preferred technical solution, a liquid injection hole is provided on the upper cover plate, and an air extraction hole connected to the cavity is also provided on the circumferential inner wall of the liquid injection hole.

[0015] As a preferred technical solution, an anti-rotation boss is provided at one end of the core body connected to the upper cover plate, a limiting boss is provided at the bottom end of the upper cover plate, a limiting groove matching the anti-rotation boss is opened on the limiting boss, and the limiting boss and the upper cover plate are combined to form a core body positioning groove.

[0016] As a preferred technical solution, the core is coaxial with the axis of the battery housing.

[0017] As a preferred technical solution, poles are provided on the ends of the upper cover plate and the lower cover plate facing away from the core body, and a safety valve is also provided on the lower cover plate.

[0018] The beneficial effects of the utility model are:

[0019] (1) In the present invention, a core body connected to the liquid injection channel is fixedly connected to the battery housing, and flow guide holes are provided in the circumferential direction of the core body, thereby improving the liquid injection efficiency of the battery.

[0020] (2) In the present invention, by arranging the core body at the center of the battery shell, the liquid injection efficiency can be improved. By arranging an exhaust channel and a liquid injection channel on the liquid injection nozzle and connecting them to the battery shell, a vacuum can be drawn while injecting liquid, thereby improving the liquid injection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of an explosion structure provided for an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the core structure provided by an embodiment of the utility model;

[0023] Figure 3A schematic diagram of the upper cover structure provided by an embodiment of the utility model;

[0024] Figure 4 A schematic diagram of the air extraction hole structure provided by an embodiment of the utility model;

[0025] Figure 5 A schematic diagram of the structure of the upper cover plate provided in an embodiment of the utility model when viewed from the bottom;

[0026] Figure 6 The embodiment of the utility model provides Figure 5 A local enlarged structural schematic diagram;

[0027] Figure 7 A schematic diagram of the guide hole structure provided by an embodiment of the utility model;

[0028] Figure 8 The embodiment of the utility model provides Figure 7 B is a schematic diagram of a local enlarged structure;

[0029] Fig. 9 A bottom view of the structure of the lower cover provided by the embodiment of the utility model;

[0030] Fig.10 A schematic diagram of the top view of the lower cover plate provided in an embodiment of the utility model;

[0031] Fig.11 A schematic diagram of the liquid injection nozzle structure provided by an embodiment of the utility model;

[0032] Fig.12 A schematic diagram of the structure of the air extraction channel provided in an embodiment of the utility model;

[0033] Fig.13 A schematic diagram of the structure of the internal liquid injection tube provided in an embodiment of the utility model;

[0034] Figure numbers: 1. Upper cover; 2. Core; 3. Lower cover; 4. Liquid injection nozzle; 5. Shell; 6. Pole; 7. Liquid injection hole; 8. Air extraction hole; 9. Limiting boss; 10. Limiting groove; 11. Safety valve; 12. Core positioning groove; 13. Anti-rotation boss; 14. Guide hole; 15. Outer tube; 16. Internal liquid injection tube; 17. Guide prism; 18. Air extraction channel; 19. Liquid injection channel; 20. Sealing ring. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] See also Figure 1 , Figure 3 , Fig.12 A battery liquid filling device comprises a liquid filling nozzle 4 and a battery shell. The liquid filling nozzle 4 is provided with a liquid filling channel 19 and an exhaust channel 18. A closed cavity structure is provided in the battery shell. A core body 2 connected to the liquid filling channel 19 is fixedly connected in the cavity. The core body 2 is circumferentially provided with at least one guide hole 14 arranged along its axial direction. In this embodiment, the guide hole 14 is linear and is provided with four. A liquid filling hole 7 and an air guide channel are provided in the battery shell. The exhaust channel 18 is connected to the cavity through the air guide channel. The liquid filling channel 19 is connected to the central through hole of the core body 2 through the liquid filling hole 7, so that the cavity can be evacuated through the exhaust channel 18 when and before the battery is filled with liquid, so as to improve the liquid filling efficiency.

[0037] See also Figure 1 , Figure 3 , Figure 4 , Figure 5 The battery housing includes a housing 5, an upper cover plate 1, and a lower cover plate 3. The upper cover plate 1 and the lower cover plate 3 are fixedly connected to the two ends of the housing 5, respectively. A liquid injection hole 7 is opened at the center of the top of the upper cover plate 1. The circumferential inner wall of the liquid injection hole 7 is also opened with an air extraction hole 8 connected to the cavity. The air extraction hole 8 forms an air guide channel. In this embodiment, six air extraction holes 8 are taken as an example, but it is not limited to this. See Figure 7 , Figure 8 An anti-rotation boss 13 is provided at one end of the core 2 connected to the upper cover plate 1, and a limiting boss 9 is fixedly connected to the bottom end of the upper cover plate 1. A limiting groove 10 adapted to the anti-rotation boss 13 is opened on the limiting boss 9. The limiting boss 9 and the upper cover plate 1 are combined to form a core positioning groove adapted to the size of the core 2. A pole 6 is provided at one end of the upper cover plate 1 and the lower cover plate 3 away from the core 2. A safety valve 11 is also provided on the lower cover plate 3. The safety valve 11 is located in the non-pole 6 area, and a core positioning groove 12 is provided at the center of the lower cover plate 3.

[0038] See also Fig.11The injection nozzle 4 also includes an internal injection tube 16, and a guide prism 17 is provided at one end of the internal injection tube 16 connected to the upper cover plate 1. A central through hole is opened in the internal injection tube 16 and the guide prism 17, and the central through hole forms an injection channel 19, and the injection channel 19 is connected to the injection equipment; an outer tube 15 is fixedly connected to the outside of the internal injection tube 16, and an exhaust channel 18 is formed between the outer tube 15 and the internal injection tube 16, and the exhaust channel 18 is connected to the external exhaust equipment. The injection nozzle 4 is detachably connected to the upper cover plate 1, and a sealing ring 20 is fixed at the bottom of the outer tube 15. The sealing ring 20 is used to contact and seal with the top of the upper cover plate 1, and a sealing ring 20 is fixedly connected to the outside of the connecting section between the internal injection tube 16 and the guide prism 17, and the sealing ring 20 is used to seal the injection hole 7.

[0039] How to use: See Fig.13 , the external vacuum equipment starts to vacuum, and the sealed vacuum cavity is connected to the inner wall of the cavity through the vacuum holes 8 on all sides, so that a negative pressure environment is formed inside the battery cell. At this time, the electrolyte reaches the bottom of the battery cell through the injection channel 19, the injection hole 7, and the core 2, and then diffuses to the surroundings through the guide hole 14 under the core 2. Since the entire battery cell is sealed and in a negative pressure environment, the electrolyte will be accelerated to be sucked into the battery cell under the action of pressure, achieving a rapid penetration effect; when the electrolyte reaches the specified injection amount, the vacuum and the injection are disconnected, the injection nozzle 4 rises, and the battery cell injection process is completed.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery filling device, characterized in that: The invention comprises a liquid injection nozzle (4) and a battery shell, wherein the liquid injection nozzle (4) is provided with a liquid injection channel (19), and the battery shell is provided with a closed cavity structure, wherein a core (2) connected to the liquid injection channel (19) is fixedly connected to the cavity, and the core (2) is provided with at least one guide hole (14) arranged along its axial direction in the circumferential direction.

2. A battery liquid filling device according to claim 1, characterized in that: The battery housing is also provided with an air guide channel, and the liquid injection nozzle (4) is also provided with an air extraction channel (18), and the air extraction channel (18) is connected to the cavity through the air guide channel.

3. A battery liquid filling device according to claim 1, characterized in that: A guide prism (17) is provided at one end of the liquid injection nozzle (4) connected to the battery housing, and a central through hole is provided in the liquid injection nozzle (4) and the guide prism (17), and the central through hole forms the liquid injection channel (19).

4. A battery liquid filling device according to claim 2, characterized in that: An outer tube (15) is fixedly connected to the outside of the liquid injection nozzle (4), and the air extraction channel (18) is formed between the outer tube (15) and the liquid injection nozzle (4).

5. A battery liquid filling device according to claim 2, characterized in that: The battery housing comprises a housing (5), an upper cover plate (1) and a lower cover plate (3), and the upper cover plate (1) and the lower cover plate (3) are respectively fixedly connected at two ends of the housing (5).

6. A battery liquid filling device according to claim 5, characterized in that: The liquid injection nozzle (4) is detachably connected to the upper cover plate (1), and a sealing ring (20) is provided at one end of the liquid injection nozzle (4) connected to the upper cover plate (1).

7. A battery liquid filling device according to claim 5, characterized in that: The upper cover plate (1) is provided with a liquid injection hole (7), and the circumferential inner wall of the liquid injection hole (7) is also provided with an air extraction hole (8) which is connected to the cavity.

8. A battery liquid filling device according to claim 5, characterized in that: An anti-rotation boss (13) is provided at one end of the core body (2) connected to the upper cover plate (1), a limiting boss (9) is provided at the bottom end of the upper cover plate (1), a limiting groove (10) adapted to the anti-rotation boss (13) is provided on the limiting boss (9), and the limiting boss (9) and the upper cover plate (1) are combined to form a core body positioning groove.

9. A battery liquid filling device according to claim 1, characterized in that: The core (2) is coaxial with the axis of the battery casing.

10. A battery liquid filling device according to claim 5, characterized in that: The ends of the upper cover plate (1) and the lower cover plate (3) facing away from the core body (2) are both provided with poles (6), and the lower cover plate (3) is also provided with a safety valve (11).

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