a battery capacitor

Abstract

The invention discloses a cell capacitor which comprises an electrical core, a cell capacitor housing and a connector, wherein the cell capacitor housing limits the installation space of the electrical core and comprises an anode housing and a cathode housing, and the electrical core comprises an anode plate and a cathode plate and is arranged between the anode housing and the cathode housing. The cathode plate is electrically connected with the cathode housing, and the anode plate is electrically connected with the anode housing through the connector. The inner side surface of the anode housing is provided with an aluminum connector connected with the anode plate, and the connector is made of aluminum or aluminum alloy material. A compact oxide layer on the aluminum surface prevents current collector oxidation under electrolyte and high potential environment, so that the aluminum connector and the anode plate are electrically connected in a better way under the electrolyte and charging and discharging environment, and the anode plate and the anode housing are electrically connected in a better way through the aluminum connector. A support for fixing a coiled core is injected on the housing of the cell capacitor, so that the cell capacitor has better shockproof and anti-breaking performance.

Description

technical field [0001] The invention relates to the technical field of lithium battery processing, in particular to a supercapacitor, and in particular to a battery capacitor structure. Background technique [0002] Battery capacitor is a type of capacitor, which has the advantages of high power, wide temperature range, long life and high reliability. Currently, cylindrical or square products are generally promoted in the market, which cannot meet the needs of card-type or thin products for built-in power supplies. . The purpose of the present invention is to introduce a battery capacitor structure, which has the characteristics of thin thickness and regular shape. It has a stainless iron shell to ensure the high reliability and long service life of the battery capacitor. It can be widely used in card type or thin thickness requirements. At the same time, it has an injection molded bracket to fix the internal battery core, improve the shockproof performance of this type of ...

AI Technical Summary

Problems solved by technology

The shape of the button battery capacitor is round, while the usual battery cell is square, the internal space utilization rate is not high, and the battery cell is easy to shake without support in the shell, only less than 10 times of 2m high drop test battery pole piece and steel shell The connection will break or fall off, causing the battery to fail, which will limit the application process of the product

[0005] Secondly, the existing general practice is to use stainless steel strips to directly spot-weld the positive and negative pole pieces and the positive and negative steel shells together. It is easy to realize welding between stainless steel and stainless steel, but this welding method has the following disadvantages: 1. Stainless steel is used as the positive electrode, so the impedance of the battery capacitor is relatively large compared with the aluminum material, and the electrical performance is not good.

2. The high oxidation potential of charging and discharging in a high voltage environment will lead to electrochemical corrosion, resulting in corrosion of solder joints and eventually poor contact between the positive electrode sheet and the positive electrode shell, which will increase the impedance of the battery capacitor and even fail

3. The spot welding connection of the stainless steel strip in the battery occupies a limited thickness space, and the steel strip squeezes the battery under the condition of compression after sealing, which will cause the surface of the battery to be uneven, which means that the positive and negative plates are uneven. Parallel causes inconsistent movement paths of lithium ions from the positive electrode to the negative electrode, and finally generates lithium dendrites to pierce the separator and cause a short circuit between the positive and negative electrodes and the short circuit of the cell

4. There may be a risk of short circuit caused by puncturing the diaphragm due to the possible welding burrs at the spot welding between the steel strip and the steel shell

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