Cylindrical battery, battery module and battery pack

Abstract

The invention relates to a cylindrical battery. The cylindrical battery comprises a shell, a battery cell, a pole, a cover plate, a positive collector plate and a negative collector plate, the shell is of a cylindrical groove structure, and the battery cell, the positive collector plate and the negative collector plate are all arranged in the shell. The cover plate is connected with the notch of the shell. The pole is riveted with the shell, the pole penetrates into the shell from the bottom end face of the shell, and an insulating sealing piece is arranged between the pole and the shell. The battery cell is of a full-tab structure, the two end faces of the battery cell are connected with the positive collector plate and the negative collector plate respectively, the end, located in the shell, of the pole is electrically connected with the battery cell through the positive collector plate, and the shell is electrically connected with the negative collector plate. The invention also relates to a battery module. The battery module comprises the cylindrical battery. The invention also relates to a battery pack. The battery pack comprises the battery module.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a cylindrical battery, a battery module and a battery pack. Background technique [0002] Existing cylindrical lithium-ion batteries generally include a casing, cells and electrolytes contained in the casing, and a cap. The shell is generally a cylindrical tank made of metal material. The cap is connected with the notch of the shell, and the sealing rubber ring is used to insulate and seal between the cap and the shell, so as to maintain the integrity and sealing of the shell. The battery cell is generally wound by positive and negative pole pieces and a diaphragm. The positive pole piece and the negative pole piece are respectively provided with positive pole lugs and negative pole lugs perpendicular to the pole piece. The battery core is connected to the cap through the positive pole lug, so the cap is also used as a positive connection Terminal, the cell is connected to the shell thr...

AI Technical Summary

Problems solved by technology

[0004] 1. The positive connection terminal and the negative connection terminal are respectively arranged on the two end faces of the cylindrical lithium-ion battery, which has certain restrictions on the grouping technology of the battery

When the batteries are connected in series and parallel into groups, the batteries must be placed according to the polarity requirements of the corresponding positions, which increases the risk of pre-positioning and placement errors;

[0005] 2. The positive connection terminal and the negative connection terminal are respectively arranged on the two end faces of the cylindrical lithium-ion battery, so the cooling area of ​​the battery group can only be set on the outer wall of the battery, which limits the contact area between the cooling tube and the battery, and at the same time , which also reduces the space utilization rate of the battery cell module in the horizontal direction;

[0006] 3. The cap used by the battery generally needs to add a ladle for welding on the surface of the explosion-proof valve, which will affect the release of internal energy when the battery is opened under extreme conditions;

[0007] 4. The sealing rubber ring is used for insulation and sealing between the cap and the shell of the battery. When discharging at a high rate, the heat released by the positive electrode can only be conducted through the external connecting piece and the internal tab. The thermal diffusion efficiency is low, and local overheating is prone to occur. , leading to thermal runaway of the battery;

In this way, the positive and negative tabs generate a lot of heat when they are discharged at a high rate, and if the local heat is too large, it is easy to cause thermal runaway.

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