Cascade combined protection equilibrium module for large-capacity lithium ion battery

Abstract

The invention provides a series combination protecting-balancing module for high-capacity lithium ion batteries, which adopts a special micropower integrated circuit of a single lithium ion battery as a detection controller of individual battery voltage, reduces consumable current, and obtains high-precision detection voltage. Optical couplers are driven through a MOSFET, so as to realize the logic synthesis and level transfer of the charge-discharge protection control signals of every individual battery, and a Schmidt trigger circuit is adopted to reshape a total discharge control signal. The sampling of the current value and voltage limitation of a loading loop are realized through a MOSFET source follower circuit, and the multilevel current and short-circuit detecting function of a special integrated circuit is utilized to realize over-current and short-circuit protection and state keeping. The power supply of a control loop is realized by use of a whole-set electricity taking mode, so as to guarantee the consumable current balance of every individual battery; and an intermittent balance control mode is realized by utilizing the voltage-delay return difference of charging-protection staring-releasing control signals.

Description

Technical field: [0001] The invention relates to a module device for charge-discharge protection and charge equalization of a large-capacity lithium-ion series battery pack, which can ensure the safety of the charge-discharge process and each battery cell at the end of charging when the large-capacity lithium-ion battery is used in series The same as the charging saturation. Background technique: [0002] As we all know, lithium-ion batteries have incomparable advantages over other batteries in terms of energy density, specific energy, memory effect, cycle life and environmental protection. Portable products made of lithium-ion batteries are light in weight, small in size and long in service life. Long, especially no pollution to the environment, has been widely valued by people. In recent years, it has been widely used in portable electronic information products such as mobile communication terminals and notebook computers. However, due to the harsh conditions for safe us...

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Problems solved by technology

[0005] In order to overcome the shortcomings of existing products such as large self-consumption current (several mA-tens of mA), low precision of protection and equalization operating voltage, poor anti-interference performance, large equalization calorific value, and high failure rate, the present invention provides a Large-capacity lithium-ion battery series combination protection and equalization module with low self-consumption current, small balanced heat generation, and high reliability

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