Battery cell with laminated structure and high-voltage lithium battery

Abstract

The invention provides a battery cell with a laminated structure. The battery cell comprises a continuous diaphragm which can be folded in a Z shape, a plurality of first pole piece groups are sequentially arranged at one side of the continuous diaphragm, and a plurality of second pole piece groups are sequentially arranged at the other side of the continuous diaphragm. The first pole piece groups and the second pole piece groups are alternately arranged at the two sides of the continuous diaphragm, a first gap is formed between every two adjacent first pole piece groups, and a second gap is formed between every two adjacent second pole piece groups. The width of the first gap is equal to that of the second gap, each first pole piece group comprises a positive pole piece and a first composite pole piece adjacent to the positive pole piece, and each second pole piece group comprises a negative pole piece and a second composite pole piece adjacent to the negative pole piece. In addition, the invention also provides a high-voltage lithium battery. The battery cell with the laminated structure and the high-voltage lithium battery of the present invention are simple in structure, are convenient to install, and are high in flexibility and high in practicability.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery cell with a laminated structure and a high-voltage lithium battery. Background technique [0002] Compared with other batteries, lithium batteries have the characteristics of high working voltage, small size, light weight, high energy, no memory effect, no pollution, small self-discharge and long cycle life. Therefore, lithium batteries are widely used in high-end power products, Energy storage, 3C consumption and other fields. [0003] Lithium batteries are mainly composed of five parts: positive electrode, negative electrode, separator, electrolyte and outer packaging, and the output voltage of lithium battery mainly depends on the positive electrode material and negative electrode material. Generally, the positive electrode materials of lithium-ion batteries mainly include: lithium iron phosphate, lithium cobaltate, lithium manganate, lithium nickelate, lithium ni...

AI Technical Summary

Problems solved by technology

[0005] Based on this, the embodiment of the present invention provides a battery cell with a laminated structure and a high-voltage lithium battery, aiming to solve the problem of increasing the voltage of a single battery cell by doping and modifying the positive electrode material, which has limited improvement in the voltage of the lithium battery. , the positive electrode material after doping and modification is poor in stability and expensive; the voltage and power of lithium batteries are increased by assembling multiple single cells in series and parallel to form a battery pack, which will increase additional connecting pieces, as well as the cost of auxiliary materials and labor costs. At the same time, there is a high requirement for the consistency of the single cells connected in series and parallel, and there is a risk of reversed positive and negative poles or improper installation of the connecting piece during the assembly process.

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