Zero-v charging circuit for lithium battery protection and working method thereof
A charging circuit, lithium battery technology, applied in battery circuit devices, circuit devices, current collectors, etc., can solve problems such as inability to charge normally, and achieve the effects of simple design, improved performance, and convenient production
Inactive Publication Date: 2015-04-08
中船鹏力(南京)新能源科技有限公司
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[0014] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0015] Such as figure 1 As shown, a zero-volt charging circuit for lithium battery protection disclosed in the present invention includes a charge-discharge interface P2, a battery interface P1, and a pair of P-channel MOSFETs placed on the positive pole of the battery: charge control MOSFET Q1 and discharge control MOSFET Q4 also includes a transistor Q2, a transistor Q3, a first control terminal 1 for controlling the switch of the charge MOSFET Q1, a transistor Q5 for controlling the switch of the discharge MOSFET Q4, a second control terminal 2, and resistors R1 to R7. The source of the charging control MOSFET Q1 is respectively connected to the positive pole of the charging port P2 and the collector of the triode Q3 through the resistor R1; the gate and source of the charging control MOSFET Q1 are connected to both ends of the resistor R2; the ...
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The invention discloses a zero-v charging circuit for lithium battery protection and a working method thereof. The zero-v charging circuit for lithium battery protection comprises a charging and discharging interface (P2), a battery interface (P1), a charging control metal-oxide-semiconductor field effect transistor (MOSFET) (Q1), a discharging control MOSFET (Q4), a first triode (Q2), a second triode (Q3), a third triode (Q5), a first control end (1), a second control end (2), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6) and a seventh resistor (R7). By means of the zero-v charging circuit for lithium battery protection, lithium batteries can be charged through an outside charger even though the voltage of an open circuit of the lithium batteries is zero. The zero-v charging circuit for lithium battery protection is simple in design, facilitates practicality in product design, improves performance of a protection system, is convenient to produce without increasing assembly parts, adopts devices which are all switching control devices, is free of special requirements for high voltage, large power and the like, and is low in cost.
Description
technical field [0001] The invention discloses a zero-volt charging circuit for lithium battery protection and a working method thereof, and particularly relates to a protection circuit for charging the lithium battery when the lithium battery is in a completely empty state (the voltage is almost zero volts), It belongs to the technical field of battery charging and discharging. Background technique [0002] Due to the chemical characteristics of lithium-ion batteries, during normal use, there is a positive chemical reaction in which electrical energy and chemical energy are converted into each other. Under certain conditions, such as overcharging, overdischarging and overcurrent of the lithium battery will cause chemical side reactions inside the battery, which will seriously affect the performance and service life of the battery, and may generate a large amount of gas. The internal pressure of the battery increases rapidly and then explodes, causing safety problems. Ther...
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IPC IPC(8): H02J7/00
Inventor 徐进杨晓川刘伟刘婉丽孙善勤
Owner 中船鹏力(南京)新能源科技有限公司