Support body of wound battery core

Abstract

The invention discloses a support body of a wound battery core. An eccentric hole for sleeving the wound battery core is formed on the support body. A longitudinal notch is formed on the outer peripheral faces of the eccentric hole and the support body. A fin is arranged on the periphery of the eccentric hole. The bottom of the eccentric hole is provided with an air vent leading to the tail end of the support body. The support body is geometrically cylindrical, has the diameter of 1 to 30mm and the height of 10 to 100mm and is made from a nonconductive material. The support body has the effects that: the wound battery core is sleeved into a special support body or the support body with a polygon prism shape to form a special battery core, and after the battery core is wound, an anode and a cathode are in close contact and the internal resistance of a battery is low, so that the current efficiency of the battery is high; due to high assembly compactness, active substances are difficult to drop and reduction in capacity is not obvious even though an electrode material is expanded; and due to proper assembly compactness, the active substances relatively less drop, the probability of micro-short circuiting and short-circuiting in the battery is low and the service life of the battery is stable even though the electrode material is expanded.

Description

Technical field: [0001] The invention relates to a supporting body on a battery winding core, which can be used on cylindrical sealed low-capacity batteries of AAAAA, AAAA, AAA, N, AA, A, SC, C, D and other types. Background technique: [0002] The current cylindrical sealed battery core is wound in the order of positive electrode sheet, separator, and negative electrode sheet. According to the design of the electrode sheet and separator process, there will be a certain size of air space in the center of the wound cell and the upper part of the cell. , on the one hand, the electrolyte can be injected to wet the entire battery cell, on the other hand, the reaction space needs, especially for low-capacity batteries, the air chamber gap will be particularly large, because the energy density of cylindrical sealed batteries is relatively high, The density of the material is high, and no matter how it is designed, it cannot fill the relatively redundant air chamber space in the ba...

AI Technical Summary

Problems solved by technology

[0002] The current cylindrical sealed battery core is wound in the order of positive electrode sheet, separator, and negative electrode sheet. According to the design of the electrode sheet and separator process, there will be a certain size of air space in the center of the wound cell and the upper part of the cell. , on the one hand, the electrolyte can be injected to wet the entire battery cell, on the other hand, the reaction space needs, especially for low-capacity batteries, the air chamber gap will be particularly large, because the energy density of cylindrical sealed batteries is relatively high, The density of the material is high, no matter how it is designed, it cannot satisfy the relatively redundant air chamber space in the battery, and will leave a large relatively redundant air chamber space in the battery

According to the conventional design, there will be the following problems: the battery cell is loose after winding, and the contact between the positive and negative electrodes is not close enough, resulting in a sharp increase in the internal resistance of the battery, which makes the current efficiency of the battery low. Expansion occurs, and the active material will fall off, which will lead to a decrease in capacity and an internal short circuit of the battery, which will affect the service life of the battery. During transportation and use, the vibration and subversion of the battery will aggravate the loosening of the battery cell, the internal resistance will increase sharply, and the short circuit will withstand pressure. low intensity

In addition, because the width of the plate is narrow and the length is long, resulting in a large difference in aspect ratio, it is easy to cause fragments during operation, resulting in high cost and low pass rate, not to mention stable electrical properties.

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