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Battery protection device, battery assembly and terminal

A battery protection device, battery technology, applied in the direction of battery circuit devices, circuit devices, secondary battery repair/maintenance, etc., can solve the problems of increased charge and discharge circuit impedance, safety issues, and increased influence of charge and discharge circuit temperature rise. The effect of high cost and high precision

Pending Publication Date: 2021-08-03
XI AN WENXIAN SEMICON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to the introduction of an additional current sampling resistor, the impedance of the charging and discharging circuit increases. When a large current is used to achieve fast charging, the current sampling resistor will also generate heat, which will significantly increase the temperature rise of the charging and discharging circuit, which may lead to safety issues, and high The precision current sampling resistor itself has a high cost

Method used

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  • Battery protection device, battery assembly and terminal
  • Battery protection device, battery assembly and terminal
  • Battery protection device, battery assembly and terminal

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0099] figure 1 is a schematic diagram of the battery assembly of the first embodiment of the present application, please refer to figure 1 , in this embodiment, the switching tube chip 200 can be used to detect the discharge current of the battery 310 .

[0100] Specifically, see in conjunction with figure 1 and image 3, in this embodiment, the main switching unit 210 includes a first switching tube group 220 and a second switching tube group 230, of course, in other embodiments of the application, the switching tube groups included in the main switching unit 210 are not limited to two groups , can also include more switching tube groups according to actual needs. In this embodiment, the first switch transistor group 220 includes a plurality of MOS transistors. In this embodiment, the plurality of MOS transistors in the first switch transistor group 220 are connected in parallel, and the second switch transistor group 230 includes a plurality of MOS transistors. In this ...

no. 2 example

[0123] Figure 4 is a schematic diagram of the switch tube chip in the second embodiment of the present application, please refer to Figure 4 , in this embodiment, the switching tube chip 200 can be used to detect the charging current of the battery 310 .

[0124] In this embodiment, like the first embodiment, the main switch unit 210 includes a first switch tube group 220 and a second switch tube group 230, and the switch control terminal of the battery protection module 100 includes a charge control terminal CO and a discharge control terminal DO , the signal of the charging control terminal CO is used to control the first switch tube group 220 to be turned on or off, and the signal of the discharge control terminal DO is used to control the second switch tube group 230 to be turned on or off.

[0125]In this embodiment, the detection switch unit 250 includes a detection switch transistor group 280 , and the connection method of the detection switch transistor group 280 is...

no. 3 example

[0146] Figure 8 is a schematic diagram of the battery assembly of the third embodiment of the present application, please refer to Figure 8-Figure 10 , in this embodiment, the main switch unit 210 and the detection switch unit 250 can be used not only for detecting the discharge current of the battery 310 , but also for detecting the charging current of the battery 310 .

[0147] In this embodiment, like the first embodiment, the main switch unit 210 includes a first switch tube group 220 and a second switch tube group 230, and the switch control terminal of the battery protection module 100 includes a charge control terminal CO and a discharge control terminal DO , the signal of the charging control terminal CO is used to control the first switch tube group 220 to be turned on or off, and the signal of the discharge control terminal DO is used to control the second switch tube group 230 to be turned on or off.

[0148] In this embodiment, the battery protection module 100 ...

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Abstract

The embodiment of the invention provides a battery protection device. The battery protection device comprises a battery protection module; a switch tube chip which comprises a main switch unit and a detection switch unit, wherein the main switch unit comprises a first main connecting end used for being connected with the negative electrode of the battery, a second main connecting end used for being connected with a load and a main control end connected with the switch control end; the detection switch unit comprises a first detection connection end, a second detection connection end and a detection control end connected with the switch control end, wherein the first detection connection end is electrically connected with the main switch unit, and the second detection connection end is electrically connected with the first reference output end; the second main connecting end is further electrically connected with the current sampling end, and the overcurrent protection unit compares the voltage of the current sampling end with the voltage of the first reference output end so as to judge whether the current flowing through the main switch unit is abnormal or not. The invention also provides a battery assembly and a terminal. The device has the advantages of cost reduction, safety, high precision and stability.

Description

technical field [0001] The present application relates to the technical field of batteries, in particular to a battery protection device, a battery assembly and a terminal. Background technique [0002] At present, fast charging of terminals has become a common customer demand. The fast charging technology used in terminals has become a popular technology at present, but the heat generated by fast charging is also a problem for the entire industry. When the charging current doubles, the same The heat generated by the impedance of the charging circuit will be quadrupled. [0003] Lithium-ion batteries used in some common terminals need a protection circuit packaged inside the battery and connected in series with the battery cells to monitor the lithium-ion battery's charging overvoltage, discharging undervoltage, charging overcurrent, Discharge overcurrent, the charging and discharging current must meet the requirements of relevant specifications. [0004] In the current de...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/48G01R31/389
CPCH01M10/4285H01M10/425H01M10/4257H01M10/48G01R31/389H01M2010/4271H01M2010/4278Y02E60/10
Inventor 宋利军张子敏
Owner XI AN WENXIAN SEMICON TECH CO LTD
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