CN2899120Y - A battery cap and a cylindrical metal-air battery including the cap - Google Patents

Abstract

A cylindrical metal-air battery cap, the cap includes a top cover (1) and a bottom box (3), the top cover (1) and the bottom box (3) are fixedly connected, wherein the top cover (1) and The space formed between the bottom boxes (3) contains a waterproof and air-permeable layer (2); the top cover (1) has air holes (8), and the bottom box (3) has an opening (5). The battery cap provided by the utility model can balance the air pressure inside and outside the battery, effectively prevent the leakage of the battery electrolyte, and improve the safety of the cylindrical metal-air battery; The hydrogen gas is discharged smoothly.

Description

A battery cap and a cylindrical metal-air battery including the cap

technical field

The utility model relates to a battery cap and a battery including the cap, in particular to a battery cap and a cylindrical metal-air battery including the battery cap.

Background technique

Due to its low environmental pollution, metal-air batteries are gradually replacing the existing nickel-cadmium and nickel-metal hydride batteries and are widely used. Metal-air batteries, especially power-type metal-air batteries, have better sealing performance to prevent battery leakage and ensure the stability of battery performance; there must be sufficient air supply to ensure discharge performance during work; the gas generated by the battery work (Hydrogen) must be discharged in time, otherwise the air pressure inside and outside the battery will be unbalanced, and there will be safety problems.

CN 2382140Y discloses a cylindrical zinc-air battery. The battery has a cylindrical insulating casing. The inner wall at the opening of the upper section of the casing is sealed and plugged into the insulating inner wall, and the outer wall is threadedly connected to the outer cover to ensure the battery's durability. tightness. However, the zinc-air battery of this solution is too tightly sealed, which will cause insufficient air supply, limit the instantaneous high-current discharge performance of the battery, and cannot meet the requirements of power batteries; Excessive battery internal pressure poses a safety hazard.

CN 2410746 discloses a cylindrical zinc-air battery, which has an air hole near the center of the bottom, so that air can enter when the battery is working. However, the diameter of the air holes in this solution is 0.2-2.0 mm, and there is a problem of insufficient air supply, which directly limits the high-rate discharge of the battery; at the same time, the problem of electrolyte leakage has not been well solved.

To sum up, the metal-air batteries in the prior art cannot take into account the problems of battery sealing, gas permeability and safety.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the cylindrical metal-air battery cap in the prior art that the airtightness, air permeability and safety cannot be taken into account, and to provide a cylindrical metal-air battery with excellent airtightness, air permeability and safety. Battery cap.

The second object of the present invention is to provide a cylindrical metal-air battery using the above-mentioned cap.

The utility model provides a cylindrical metal-air battery cap, the cap includes a top cover 1 and a bottom box 3, the top cover 1 and the bottom box 3 are fixedly connected, wherein, the top cover 1 and the bottom box 3 The formed space contains a waterproof and breathable layer 2; the top cover 1 has an air hole 8, and the bottom box 3 has an opening 5.

The utility model also provides a battery, which comprises a battery cap, a battery case 6, and a positive electrode cylinder 9 sealed in the battery case, a diaphragm cylinder 11, a zinc paste 12 and a negative lead-out sheet 7, the battery case 6 Covered outside the positive pole tube 9, the positive pole tube 9 is set outside the diaphragm tube 11, the diaphragm tube 11 contains the zinc paste 12, one end of the negative lead-out sheet 7 is immersed in the zinc paste 12, and one end is connected to the battery cap, wherein, the The battery cap is the battery cap provided by the utility model.

The battery cap provided by the utility model can balance the air pressure inside and outside the battery, effectively prevent the leakage of the battery electrolyte, and improve the safety of the cylindrical metal-air battery; The hydrogen gas is discharged smoothly.

Description of drawings

Figure 1 is a schematic cross-sectional view of a battery of the present invention;

Fig. 2 is a top view of the battery of the present invention.

in the picture

1——Top cover 2——Waterproof and breathable layer

3——Bottom box 4——Insulation ring

5——Bottom box opening 6——Battery housing

7——Negative pole ear 8——Stomatal hole

9——Positive electrode cylinder 10——Sealing cover

11——diaphragm cylinder 12——zinc paste

13 - insulating washer

Detailed ways

The cylindrical metal-air battery cap provided by the utility model includes a top cover 1 and a bottom box 3, and the top cover 1 and the bottom box 3 are fixedly connected, wherein the space formed between the top cover 1 and the bottom box 3 accommodates A waterproof and breathable layer 2; air holes 8 are provided on the top cover 1, and openings 5 are provided on the bottom box 3.

The waterproof and air-permeable layer 2 can be various materials commonly used in the field with hydrophobic and air-permeable properties and a certain strength. For example, carbon powder, polytetrafluoroethylene (PTFE) emulsion, pore forming agent, etc. are rolled into a film of a certain thickness according to a certain ratio, and then spread on the nickel mesh or copper mesh to combine the two by punching or rolling. Then sintered at high temperature to make its microstructure into a three-dimensional net-like hydrophobic and breathable material. The thickness of the waterproof and air-permeable layer 2 is 0.7-2.5 mm, and the radius of the waterproof and air-permeable layer 2 is 2.5-10.0 mm. The waterproof and breathable layer can effectively prevent the leakage of the electrolyte, and can balance the air pressure inside and outside the battery at any time. When the battery is working, the air can enter the inside of the battery in time, and the hydrogen generated by the battery can also be discharged from the battery in time to prevent the battery from being generated. The gas cannot be discharged in time, resulting in excessive internal pressure of the battery, and even causing the battery to explode.

Just have air hole 8 (as shown in Figure 1 and Figure 2) on the said top cover 1 of the utility model. The pores 8 account for 40-60% of the surface area of the top cover. The air hole of the utility model has a reasonable position and a larger area than the conventional metal-air battery, which can ensure sufficient air supply when the battery is working. Before the battery is not in use, it can be sealed to prevent air from entering and consuming the electrode active material.

The bottom box 3 of the utility model has an opening 5 (as shown in FIG. 1 ). The opening 5 occupies 75-80% of the surface area of the bottom box. The opening 5 of the bottom box cooperates with the air hole 8 of the top cover to jointly ensure the smooth exchange of gas between the battery and the outside world.

The utility model also provides a battery, which includes a battery cap, a battery case 6, and a positive electrode cylinder 9 sealed in the battery case, a diaphragm cylinder 11, a zinc paste 12 and a negative electrode lead-out sheet 7. The battery case 6 Set outside the positive pole tube 9, the positive pole tube 9 is set outside the diaphragm tube 11, the diaphragm tube 11 contains the zinc paste 12, one end of the negative lead-out piece 7 is immersed in the zinc paste 12, and one end is connected to the battery cap, wherein, the The battery cap is the battery cap provided by the utility model.

In conjunction with Figure 1, the battery cap provided by the utility model and the battery assembly steps using the cap are described as follows:

(1), first put the waterproof and breathable layer 2 in the bottom box 3, then put the top cover 1 on the top of the bottom box 3, the edge of the bottom box 3 is rolled up and pressed together with the top cover 1, and the metal-air battery cap is completed assembly.

(2), the bottom of the positive pole cylinder 9 is connected to the bottom of the battery case 6, insert the insulating ring 13 in the positive pole cylinder 9, then insert the diaphragm cylinder 11, add the zinc paste 12 to the diaphragm cylinder 11, then add the electrolyte, immerse One end of the negative lead-out piece 7 is sealed with the diaphragm cylinder 11, and the other end of the negative lead-out piece 7 is led out. Oxygen resin seal.

(3) Add the insulating ring 4 to the battery cap obtained in (1), weld the negative lead-out sheet 7 to the bottom box 3 of the cap, and roll up the edge of the opening end of the battery case 6 and press it with the top cover 1 to complete the assembly. The top view of the battery after assembly is shown in Figure 2.

Claims (5)

1. a cylindrical metal-air cell block, described block comprises top cover (1) and end box (3), and top cover (1) is fixedlyed connected with end box (3), it is characterized in that, and the space content of formation has been received waterproof ventilative layer (2) between described top cover (1) and the end box (3); Pore (8) is arranged on the described top cover (1), opening (5) is arranged on the box of the described end (3).

2. block according to claim 1 is characterized in that, the thickness of described waterproof ventilative layer (2) is the 0.7-2.5 millimeter, and waterproof ventilative layer (2) radius is the 2.5-10 millimeter.

3. block according to claim 1 is characterized in that, described pore (8) accounts for the 40-60% of top cover surface area.

4. root block according to claim 1 is characterized in that, described opening (5) accounts for the 75-80% of end box surface area.

5. battery, this battery comprises battery cap, battery container (6) and is sealed in battery container interior anode tube (9), cylindrical diaphragm (11), calamine cream (12) and negative pole lead-out tablet (7), described battery container (6) is enclosed within outside the anode tube (9), described anode tube (9) is enclosed within outside the cylindrical diaphragm (11), described cylindrical diaphragm (11) holds calamine cream (12), described negative pole lead-out tablet (7) one ends immerse in the calamine cream (12), one end connects battery cap, it is characterized in that described battery cap is any described battery cap among the claim 1-4.

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