General-purpose rechargeable battery composed of lithium-ion battery and control method

Abstract

The invention provides a general-purpose rechargeable battery composed of a lithium-ion battery and a control method thereof. The general-purpose rechargeable battery composed of a lithium-ion battery includes: an outer packaging case, and a charge-discharge battery sequentially press-fitted and assembled in the outer packaging case. A controller, a positive electrode crimping piece, a lithium ion battery, and a negative terminal cover; the charge and discharge controller includes: a charge and discharge controller housing, and a charge and discharge control circuit welded body located in the charge and discharge controller housing, Insulating gaskets, charging and discharging controller brackets, the welding body of the charging and discharging control circuit is welded with a lithium ion battery charging and discharging control circuit, and the lithium ion battery charging and discharging control circuit includes: welded on the circuit substrate and connected to the lithium ion battery respectively Ion battery, positive terminal cover, and lithium ion battery charging control circuit electrically connected to the negative terminal cover through the charge and discharge controller shell and the outer packaging shell, lithium ion battery detection and control circuit, and DC-DC step-down type Regulated discharge circuit.

Description

technical field [0001] The invention relates to the technical field of secondary batteries or electronic power sources, in particular to a general-purpose rechargeable battery composed of a lithium-ion battery and a control method. Background technique [0002] Lithium-ion secondary batteries (hereinafter referred to as lithium-ion batteries) have the advantages of large specific energy, fast charging and discharging, long cycle life, small self-discharge, no pollution, no memory effect, etc., and are currently replacing general-purpose primary batteries and nickel metal hydride Rechargeable batteries are ideal secondary batteries. However, the output voltage of the existing lithium-ion batteries is relatively high, and the output voltage varies with the positive electrode system used. The commercialized lithium-ion batteries currently have a nominal voltage of 3.2V to 3.8V, and with lithium With the development of ion battery technology, the nominal voltage of lithium-ion ...

AI Technical Summary

Problems solved by technology

There are the following technical performance defects, one: the forward conduction voltage drop of the diode will vary with the operating current and temperature during charging, which reduces the detection and charging control accuracy of the charging control circuit for lithium-ion batteries. When the conduction voltage drop is high, there will be a problem that the lithium-ion battery cannot be fully charged. When the forward conduction voltage drop of the diode is low, the lithium-ion battery is prone to overcharging, which reduces the charging performance and safety of the lithium-ion battery; second: Since the charging circuit is connected to the isolation diode, the charging input voltage of the rechargeable battery is raised. Since the charging upper limit voltage of the existing cobalt-lithium system lithium-ion battery has reached 4.35V and will increase in the future, if the nominal voltage is 5V± 0.25V existing general-purpose lithium-ion battery charging adapter or computer USB interface to charge the rechargeable battery, even if a Schottky device with a low forward conduction voltage drop is used, the charging input voltage lower limit and the isolation diode conduction voltage drop upper limit state However, there is still the problem that the lithium-ion battery cannot be fully charged. Although a boost circuit can be used in the external charging device to solve this problem, it will cause problems such as an increase in the cost of the charging device, and a decrease in efficiency and reliability; third: the external temperature The sensing circuit can only indirectly detect the temperature of the lithium-ion battery through the outer packaging shell or electrodes of the rechargeable battery, which reduces the detection accuracy of the charging temperature of the lithium-ion battery, and causes the rechargeable battery to have the problem that the lithium-ion battery is overheated and the cycle life and safety are reduced. question

[0010] Second, rechargeable batteries do not have lithium-ion battery discharge overheat protection

[0011] There is no lithium-ion battery temperature sensing and control circuit installed inside the rechargeable battery, so that the rechargeable battery does not have the overheat protection function during the discharge process of the lithium-ion battery. Risk of upper operating temperature, thus reducing the cycle life and safety of Li-ion batteries

[0012] Third, the structure and assembly process of the charge and discharge controller are complex

In addition, the elastic negative electrode is a movable part, and its structure occupies a large internal space of the charge-discharge controller, and makes it difficult to realize the sealing of the charge-discharge controller

As a result, the charge and discharge controller has a large volume, complex and difficult manufacturing process, is not conducive to automatic mass production assembly, and cannot achieve waterproof sealing. Prone to circuit failure problems

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