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Single lithium battery protection ICs and single lithium battery protection circuits

A lithium battery and charge-discharge circuit technology, applied in the field of fast charging of single-cell lithium batteries, can solve the problems of MOS tubes not getting driving voltage, large internal resistance, easy to heat, etc., to reduce heat generation and internal resistance of conduction Small, the effect of improving the safety factor

Inactive Publication Date: 2019-03-08
SUNWODA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a single-cell lithium battery protection IC and a single-cell lithium battery protection circuit, aiming to solve the problem that the MOS tube in the external circuit of the current single-cell lithium battery protection IC cannot be turned on due to insufficient driving voltage. The problem of high internal resistance and easy heating

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  • Single lithium battery protection ICs and single lithium battery protection circuits
  • Single lithium battery protection ICs and single lithium battery protection circuits
  • Single lithium battery protection ICs and single lithium battery protection circuits

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Embodiment Construction

[0050] It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0051] Refer to figure 1 In an embodiment of the present application, a single-cell lithium battery protection IC is provided, including a single-cell lithium battery protection IC body 1, an IC working auxiliary power pin VC, and a first diode 3;

[0052] The single-cell lithium battery protection IC body 1 includes a pin VDD, a charging control pin CO, and a first switch component 2;

[0053] The first switch assembly 2 includes a first switch 21, and the charging control pin CO is connected to the pin VDD through the first switch 21;

[0054] The cathode of the first diode 3 is connected to the pin VDD, the anode of the first diode 3 is connected to the charge control pin CO through the first switch 21, and the IC working pair is connected between the first diode 3 and the first switch 21 Power pin VC;

[0055] The IC w...

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Abstract

The invention provides single lithium battery protection ICs and single lithium battery protection circuits. A single lithium battery protection IC comprises a single lithium battery protection IC body, an IC working auxiliary power pin VC and a first diode. The single lithium battery protection IC body comprises a pin VDD, a charging control pin CO and a first switching assembly. The first switching assembly comprises a first switch. The IC working auxiliary power pin VC is connected between the first diode and the first switch. The IC working auxiliary power pin VC is externally connected with a charger power supply which is greater than a single lithium battery voltage. Through connection of the IC working auxiliary power pin VC and external connection of the charger power supply whichis greater than the single lithium battery voltage, in a battery charging process, a stable and relatively high working driving voltage of an MOS transistor in a protective IC external circuit is kept, switch-on internal resistance of the MOS transistor in the protective IC external circuit is reduced, under the same charging current condition, heat of the MOS transistor in the protective IC external circuit is reduced, and a safety coefficient is improved.

Description

Technical field [0001] The present invention relates to the technical field of single-cell lithium battery fast charging, in particular to a single-cell lithium battery protection IC and a single-cell lithium battery protection circuit. Background technique [0002] Due to the chemical characteristics of lithium batteries, when the battery is over-discharged, the electrolyte will decompose and deteriorate the battery characteristics, while over-charging will shorten the battery life, severely damage the battery performance, and even explode. Because of this, in order to ensure the performance, life and safety of lithium batteries, all lithium batteries need a protection circuit to achieve a series of protection functions such as overcharge, overdischarge, and overcurrent. [0003] The current single-cell lithium battery protection ICs rely on batteries to provide power, and the operating voltage is low, usually 3.0V to 4.4V, which leads to low voltage of the MOS tube in the externa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/18
CPCH02H7/18
Inventor 陈坤钟左其国
Owner SUNWODA ELECTRONICS