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Control system, control method and rechargeable battery protection integrated circuit

A rechargeable battery and control system technology, applied in battery overcharge protection, battery overcurrent protection, battery circuit devices, etc., can solve problems such as voltage balance adjustment accuracy reduction

Pending Publication Date: 2022-03-01
MITSUMI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, a voltage drop occurs due to the on-resistance of a pair of protective FETs that exist between the - terminal and the rechargeable battery cell, so the inter-terminal voltage between the midpoint terminal and the - terminal is higher than the actual cell voltage
As a result, the adjustment accuracy of the voltage balance between cells may decrease

Method used

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  • Control system, control method and rechargeable battery protection integrated circuit
  • Control system, control method and rechargeable battery protection integrated circuit
  • Control system, control method and rechargeable battery protection integrated circuit

Examples

Experimental program
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no. 1 approach ＞

[0080] figure 1 It is a figure which shows an example of a structure of the control system in 1st Embodiment. figure 1 The control system 301 shown is a system which controls the balance of the cell voltage of each of the multiple (two in this example) rechargeable battery cells 201 and 202 connected in series. The control system 301 has an external device 140 and a battery pack 151 .

[0081] The external device 140 is a device connected to the battery pack 151 . The external device 140 may be a charger for charging the battery pack 151 , or may be a device that operates with electric power supplied from the battery pack 151 . Specific examples of devices that operate using electric power supplied from the battery pack 151 include electronic devices such as smartphones, tablet PCs, and mobile phones.

[0082] The external device 140 has a balance control circuit 33 that controls the balance of the cell voltages of the plurality of rechargeable battery cells. The balance c...

no. 2 approach ＞

[0135] Figure 7 It is a diagram showing an example configuration of the control system in the second embodiment, and is a diagram showing a charging route under cell balance control based on charge and discharge of a rechargeable battery cell on the low potential side among a plurality of rechargeable battery cells. Figure 8 It is a diagram showing an example configuration of the control system in the second embodiment, and is a diagram showing a discharge path under cell balance control based on charge and discharge of a rechargeable battery cell on the low potential side among a plurality of rechargeable battery cells. In the second embodiment, the description of the same configuration as the above-mentioned embodiment is omitted by citing the above-mentioned description.

[0136] exist Figure 7 , 8 In the illustrated control system 302 , the external device 140 has a current control circuit 30 that controls the current flowing through a wiring path including at least o...

no. 3 approach ＞

[0141] Figure 9 It is a diagram showing a configuration example of the control system in the third embodiment, and is a diagram showing a discharge path under cell balance control based on discharge of a rechargeable battery cell on the low potential side among a plurality of rechargeable battery cells. Figure 10 It is a diagram showing a configuration example of the control system in the third embodiment, and is a diagram showing a discharge path under cell balance control based on discharge of a rechargeable battery cell on a high potential side among a plurality of rechargeable battery cells. Figure 11 It is a diagram showing an example configuration of the control system in the third embodiment, and is a diagram showing a charging route under cell balance control based on charging of a secondary battery cell on the low potential side among a plurality of secondary battery cells. In the third embodiment, the description of the same configuration as that of the above-ment...

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Abstract

The invention provides a control system, a control method and a rechargeable battery protection integrated circuit, which can control the balance of the cell voltage of each of a plurality of rechargeable battery cells connected in series with high precision. The present invention is provided with a rechargeable battery protection device and an external device, the rechargeable battery protection device comprising: one or more monitoring terminals provided so as to be able to monitor the potential of one or more negative electrodes of a plurality of rechargeable battery cells connected in series in a path different from a power supply path; one or more internal wires interposed between the one or more negative electrodes and the one or more monitoring terminals; and one or more internal switches inserted in series into each of the one or more internal wirings, the external device including: a balance control circuit that controls a current flowing through a wiring path including at least one of the one or more internal wirings on the basis of the potential of the one or more monitoring terminals, thereby balancing the current flowing through the wiring path; the balance of the cell voltage of each of the plurality of rechargeable battery cells is controlled.

Description

technical field [0001] The invention relates to a control system, a control method and a rechargeable battery protection integrated circuit. Background technique [0002] Conventionally, there is known a charging device for charging a battery pack having a plurality of rechargeable battery cells connected in series and a neutral terminal connected between the plurality of rechargeable battery cells. The charging device has a charging control microcomputer that adjusts the voltage balance between cells by charging and discharging from a neutral point terminal. The charging control microcomputer calculates the voltages of the two cells based on the voltage between the + terminal and the - terminal of the battery pack and the voltage between the midpoint terminal and the - terminal, and when the difference between the voltages of the two cells is more than a predetermined value, Adjust the voltage balance between cells. On the other hand, the battery pack has a pair of protec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/42H01M10/44
CPCH02J7/0014H02J7/00714H02J7/00302H02J7/00306H02J7/007182H01M10/4257H01M10/441H01M2010/4271Y02E60/10H02J7/0019H02J7/00304H02J7/00712H02J7/0016H02J7/0029H02J7/0047
Inventor 片屋宽隆北村岩
Owner MITSUMI ELECTRIC CO LTD
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