CN203950869U

CN203950869U - Anode current collector structure in cylindrical zinc-air battery

Info

Publication number: CN203950869U
Application number: CN201420256814.7U
Authority: CN
Inventors: 胡伟康
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-08-20
Filing date: 2014-05-20
Publication date: 2014-11-19
Anticipated expiration: 2024-05-20

Abstract

The utility model discloses an anode current collector structure among cylindrical zinc-air battery, it includes anode terminal and current collector, and current collector is fixed to be set up on anode terminal, current collector be lamellar structure, become the vertical setting of helical structure, and helical structure's axle center is concentric with anode terminal's axle center. The structure pair is characterized in that a sheet-shaped material is coiled into a spiral structure current collector, so that the surface area of the current collector is increased. The utility model discloses anode current collector structure in the cylindrical zinc-air battery that obtains, the innovative replacement of anode current collector is helical structure for, make under the same service environment, the current collector has higher unit mass surface area ratio, its apparent surface area increases and is showing, under the condition that does not increase anode current collector weight and does not sacrifice battery energy density, can also effectively shorten the interval between two negative and positive current collectors in the battery, improve discharge capacity and output under the high rate.

Description

Anode current collector structure in cylindrical zinc-air battery

Technical Field

The utility model relates to an alkaline battery, especially positive pole current collector structure in cylindrical zinc-air battery.

Background

In the existing cylindrical zinc-air battery patents, the problems of the structure of the cylindrical zinc-air battery, battery leakage, alkali climbing, battery tightness and the like are mainly explained, and the problems are solved. When the current is discharged at a larger current, the specific surface area of the needle-shaped current collecting rod is smaller, so that the anode polarization is larger. In addition, the distance between the anode and the cathode in the cylindrical zinc-air battery is larger (compared with the cylindrical zinc-manganese battery, the air electrode in the cylindrical zinc-air battery is thinner, when the zinc-air battery discharges, because the path of electrons transmitted by zinc paste is longer, the time for the electrons to reach the needle-shaped current collecting rod is longer, the battery has higher polarization, and the utilization rate of an anode active substance is also low.

It is calculated that if the air electrode thickness is 0,8 mm to 1.0 mm, the anode current collector adopts the alkaline zinc-manganese battery anode needle-shaped current collector rod (the diameter is 1.2-1.5 mm), and in the AA size cylindrical battery structure, the distance from the anode needle-shaped current collector rod to the cathode air electrode is 5.5 mm; in the D-type cylindrical battery, the distance between the positive and negative current collectors is 15 mm. Compared with the distance between the anode and the cathode of a zinc-manganese battery with the same size, the distance between the anode and the cathode is about 1.5 to 2 times. The distance between the anode and the cathode in the battery is enlarged, so that the ion migration or diffusion path in the battery is increased, and the electron transfer resistance is increased. The internal resistance of the battery is increased, which is not beneficial to the heavy-current discharge of the battery. In order to solve above problem and overcome these defects, this patent utility model designs a novel positive pole current collector to adapt to the zinc-air battery of various cylindrical sizes, when the heavy current discharges, realize zinc-air battery high power discharge performance, obtain higher specific power and energy density.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing the zinc-air battery who adapts to various cylindrical sizes in order to solve the not enough of above-mentioned technique, when the heavy current discharges, realize zinc-air battery high discharge performance to can obtain the cylindrical zinc-air battery middle anode current collector structure of higher specific power and energy density.

In order to achieve the above object, the utility model relates to an anode current collector structure in cylindrical zinc-air battery, it includes anode terminal and current collector, and current collector is fixed to be set up on anode terminal, current collector be lamellar structure, become the vertical setting of helical structure, and helical structure's axle center is concentric with the axle center of anode terminal. The structure pair is characterized in that a sheet-shaped material is coiled into a spiral structure current collector, so that the surface area of the current collector is increased.

Preferably, the surface of the current collector is provided with a thin indium layer, so that the current collector and the zinc paste are prevented from reacting to generate hydrogen as much as possible.

Preferably, the current collector is made of red copper or brass material, and is of a wire-drawing porous structure, a punching structure, a foam structure or a non-porous metal sheet, so that the specific surface area is increased, the weight is reduced, and the material consumption is reduced to meet the requirements of various batteries.

Preferably, the height of the current collector is consistent with the height of the zinc paste in the battery so as to ensure the working efficiency of the current collector.

The utility model discloses a manufacturing approach of anode current collector structure in cylindrical zinc-air battery at first tailors and obtains rectangular lamellar structure, wherein the rectangle include the square, then lightly roll under the control of roller and make multilayer drum structure, obtain coaxial spiral structure through radially propping drawing again, then with spiral structure inner core end fixing on positive pole utmost point ear, positive pole utmost point ear imbed in the positive pole plastic seal ring and connect in the positive pole cap.

Preferably, 5-10 wt% of indium sulfate aqueous solution is prepared as plating solution, the anode current collector is put into a beaker filled with ethanol, cleaned by an ultrasonic cleaner for 20 minutes, taken out and cleaned by distilled water for 3 times, then put into the indium sulfate plating solution for 1-3 minutes, taken out and cleaned by distilled water, and dried, so that the surface of the anode current collector is plated with a thin indium layer.

The utility model provides an anode current collector structure in cylindrical zinc-air battery and manufacturing method thereof, the innovative replacement of anode current collector is helical structure, is applicable to the battery of various sizes completely to make under the same service environment, the current collector has higher unit mass surface area ratio. The spiral anode structure has obviously increased apparent surface area, and can effectively shorten the distance between a cathode current collector and an anode current collector in the battery under the conditions of not increasing the weight of an anode current collector and not sacrificing the energy density of the battery, thereby greatly improving the discharge capacity and the output power at high rate.

Drawings

Fig. 1 is a schematic view of the structure of the anode current collector obtained by the present invention.

Fig. 2 is a discharge curve of 100 milliamp constant current discharge at room temperature for a cylindrical zinc-air battery and an alkaline zinc-manganese battery composed of the anode current collector obtained in the present invention.

Fig. 3 is a discharge curve of 1000 ma constant current discharge at room temperature for a cylindrical zinc-air battery and an alkaline zinc-manganese battery composed of the anode current collector obtained in the present invention.

Detailed Description

The invention is further described by the following embodiments in conjunction with the accompanying drawings.

Example 1

The method for manufacturing the anode current collector structure in the cylindrical zinc-air battery described in this example is to take a piece of red copper material 1 with a thickness of 0.15 mm and a net structure, and cut the material into a rectangle with a length of 26 mm and a width of 25 mm. Under the control of a stainless steel cylindrical roller, lightly rolling the two into a multi-layer cylindrical shape, then radially stretching the cylindrical shape into a coaxial spiral structure 2, welding the innermost end part 3 of the spiral structure 2 with an anode tab 4, embedding the end part of the anode tab 4 into an anode plastic sealing ring and connecting the anode tab with a circular anode cap, and arranging the sealing plastic ring at the periphery to form the anode cap of the AA type battery anode current collector.

The weight of the AA type spiral anode collector red copper material is calculated to be 0.38 g, and the apparent surface area is 26x25x2=1300 mm ² Material volume 42 mm ³ . The material weight of the needle collector bar was 0.41 grams, nearly equivalent to the weight of the spiral anode current collector, as compared to the anode needle collector bar in the RA6 size alkaline zinc manganese cell. The apparent surface area of the needle-shaped collector bar material is 1.5x3.14x27=127 mm ² Volume of 0.75x0.75x3.13x27=48 mm ³ 。

Therefore, the weight and the volume of the anode collector of the utility model are equivalent to the weight and the volume of the needle-shaped collector bar, but the apparent surface area is almost 10 times larger.

With the cylindrical zinc-air battery back that the anode current collector structure assembled into in the zinc-air battery of the utility model who obtains, its Open Circuit Voltage (OCV) is 1.46V. Fig. 2 and fig. 3 show discharge curves of the cylindrical zinc-air battery composed of the anode collector of the present invention at room temperature at current densities of less 100 ma and greater 1000 ma. For comparison with the electrochemical performance of the alkaline zinc-manganese cell, fig. 2 and 3 also show the discharge curves of the alkaline zinc-manganese cell of the same size at two current densities, where curve a is the discharge curve of the cylindrical zinc-air cell composed of the anode current collector and curve b is the discharge curve of the alkaline zinc-manganese cell.

As can be seen from FIG. 2, when 100 mA constant current is discharged, the capacitance of the alkaline Zn-Mn battery is about 2.4 to 2.5 A.H, and the discharge curve is steeper, while the discharge capacity of the cylindrical Zn-air battery formed by the anode collector of the present invention is about 5.0 A.H, and a flatter discharge platform is provided at about 1.25V. The capacitance of the cylindrical zinc-air battery composed of the anode current collector of the utility model is 2 times that of the alkaline zinc-manganese battery with the same size, the continuous discharge time is 1 time longer than that of the alkaline zinc-manganese battery, the energy density can reach 360 watt-hour per kilogram, and the energy density of the alkaline zinc-manganese battery is 150 watt-hour per kilogram.

As can be seen from fig. 3, when the battery is discharged at a large current of 1000 milliamperes, the discharge performance of the alkaline zinc-manganese dioxide battery is obviously weakened, the electrochemical capacity utilization rate of the alkaline zinc-manganese dioxide battery is obviously reduced, and the discharge curve is also obviously steep. And use the utility model discloses a cylindric zinc-air battery that positive pole current collector constitutes shows its good performance when the same heavy current discharges, and its duration discharge time and electric capacity utilization ratio are 4 times of basicity zinc-manganese battery, and the discharge curve is also more steady, has fine specific power and energy density.

Claims

1. The utility model provides an anode current collector structure in cylindrical zinc-air battery, it includes anode terminal and current collector, and the current collector is fixed to be set up on anode terminal, characterized by current collector be sheet structure, become the vertical setting of helical structure, and the axle center of helical structure is concentric with the axle center of anode terminal.

2. The structure of the collector of anode current in cylindrical zinc-air battery as claimed in claim 1, wherein said current collector is plated with a thin indium layer.

3. The structure of the collector of anode current in cylindrical Zn-air battery as claimed in claim 1, wherein the current collector is made of red copper or brass and is a wire-drawn porous structure or a punched structure or a foamed structure or a non-porous metal sheet.

4. The structure of the collector of anode current in cylindrical zinc-air cell as claimed in claim 1, wherein the height of the collector is the same as the height of the zinc paste in the cell.