Battery protection-used chip cascade structure

Abstract

The invention relates to a battery protection-used chip cascade structure. The battery protection-used chip cascade structure includes a first chip and at least one second chip; the first chip includes a first tube core and a first encapsulation tube shell; the first tube core includes a load current detection circuit unit and a charging state detection circuit unit; the input of the load current detection circuit unit is connected with a current detection tube pin of the first encapsulation tube shell through an encapsulation lead line; the input of the charging state detection circuit unit is connected with a charging detection tube pin of the first encapsulation tube shell through an encapsulation lead line; the second chip includes a first tube core and a second encapsulation tube shell; the input of the load current detection circuit unit and the input of the charging state detection circuit unit are connected with a grounding tube pin of the second encapsulation tube shell through encapsulation lead lines; the first chip and the at least one second chip are connected in series with each other so as to respectively detect the voltage of series-connected battery cores of batteries; and the first chip detects the output current of the batteries.

Description

technical field [0001] The invention relates to the technical field of integrated circuit unit design in the field of microelectronics, in particular to a chip cascade structure for battery protection. Background technique [0002] As a new energy source, lithium batteries have been widely used in various fields. During the charging and discharging process of lithium batteries, it is required to effectively protect against charging overvoltage, discharging undervoltage, overcurrent and other conditions to avoid battery damage. [0003] figure 1 It is an example of a protection circuit for a lithium battery with multiple series cells in the prior art of the present invention. exist figure 1 Among them, two identical chips MM3474 are connected in series to realize battery protection for a lithium battery with 10 cells. The lower chip controls the charge control field effect transistor (Charge control Field effect transistor) and the discharge control field effect transisto...

AI Technical Summary

Problems solved by technology

Because in the battery structure with cells connected in series, only one protection chip is needed to detect the battery load status and whether it is connected to charge, so the V-pin and CS pin in the upper series chip become redundant pins. In technology, usually the V- pin and CS pin in other chips except the chip directly connected to the charge control field effect transistor and the discharge control field effect transistor are grounded directly through the wiring on the circuit board, and an additional Circuit unit board wiring, resulting in a waste of board area and cost

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