Annular assembled battery and annular assembled battery set

Abstract

The invention is applicable in the technical field of chemical battery, and provides an annular assembled battery. The annular assembled battery is composed of an annular battery and a cylindrical battery / capacitor, wherein the cylindrical battery / capacitor is sleeved in the annular battery. The invention also provides an annular assembled battery set composed of a plurality of the annular assembled batteries connected by conductor wires. The annular assembled battery and the annular assembled battery set provided by the invention are advantaged in low production cost, high specific energy, long service life, good consistency, excellent heat dissipation performance, and convenient maintenance.

Description

technical field [0001] The invention belongs to the technical field of chemical batteries, and more specifically relates to an annular assembled battery and an annular assembled battery pack. Background technique [0002] As we all know, batteries that can be recharged repeatedly are called secondary batteries, also known as storage batteries. The common types of secondary batteries we encounter in our lives are: lead-acid batteries, nickel-cadmium / nickel-metal hydride batteries, and lithium-ion batteries. They have become an essential consumer product in modern life. See figure 1 , for the comparison of common secondary battery characteristics. From figure 1 It can be seen that all kinds of common secondary batteries have great differences and differences in terms of specific energy, safety performance, cycle life, etc., that is to say, each has its own characteristics. Among them, lead-acid batteries have the advantages of stable voltage, safety and reliability, low pr...

AI Technical Summary

Problems solved by technology

[0004] 2. The cycle life is short. As a battery for electric vehicles, it needs to be replaced after about one year of use

[0005] 3. When under-charging, it is easy to cause sulfation of the plate, which will seriously shorten the battery life

For example, lead-acid batteries used in electric vehicles, wind energy and solar energy are often unable to fully charge the battery in time, so that the battery is recycled in a partially charged state, which causes sulfation of the plate, resulting in capacity attenuation and shortened life.

[0006] 4. Not suitable for high current discharge

When the electrical appliances used work at a higher power, the actual working time of the battery is significantly shortened, resulting in the failure to reach the nominal capacity. For example, the 5C discharge capacity of an ordinary sealed lead-acid battery can only reach about 30% of the nominal capacity.

[0007] 5. The pollution to the environment is relatively serious, and it is a high-resource-consuming product. The country will not strongly support the two-high and one-asset industries now and in the future.

However, cylindrical batteries also have their own inherent disadvantages, especially large-capacity winding cylindrical batteries, because the corresponding positive and negative plates / pieces required are relatively long, and the positive and negative plates / pieces are drawn from the center of the circle. The winding starts nearby, so the cylindrical battery has high requirements on the thickness and toughness of the positive and negative plates / sheets, and the requirements for the required machinery and equipment and manufacturing processes (such as multi-pole structure) are also very high, and the manufacturing cost increases a lot. For example, the wound lead-acid battery has many advantages such as excellent high and low temperature performance, superior safety performance, small self-discharge, long service life and good shock resistance, because the grid used is very thin and the material is special pure lead Or lead-tin alloy, only a few companies in China can produce it, and they are not mass-produced yet.

[0012] In addition, when two different secondary batteries / capacitors are combined, not only the spatial arrangement of the secondary batteries / capacitors will be encountered, but also there will be problems such as large voltage drop between the secondary batteries / capacitors, which is not conducive to heat dissipation.

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