CN202948104U - Insulation detection circuit for battery box - Google Patents

Insulation detection circuit for battery box Download PDF

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Publication number
CN202948104U
CN202948104U CN 201220633899 CN201220633899U CN202948104U CN 202948104 U CN202948104 U CN 202948104U CN 201220633899 CN201220633899 CN 201220633899 CN 201220633899 U CN201220633899 U CN 201220633899U CN 202948104 U CN202948104 U CN 202948104U
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China
Prior art keywords
battery
battery box
battery case
electric leakage
loop
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Active
Application number
CN 201220633899
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Chinese (zh)
Inventor
张伟峰
程亚兵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZHEJIANG GAOTAI HAONENG TECHNOLORY CO Ltd
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ZHEJIANG GAOTAI HAONENG TECHNOLORY CO Ltd
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Priority to CN 201220633899 priority Critical patent/CN202948104U/en
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Abstract

The utility model discloses an insulation detection circuit for a battery box. The insulation detection circuit for the battery box comprises a plurality of battery packs which are in a series connection, an electric leakage detection end is led out of a casing of the battery box, a positive electrode end of the battery box, the electric leakage detection end and a sampling resistor R2 are connected to form a first electric leakage detection loop, a negative electrode end of the battery box, the electric leakage detection end and a sampling resistor R2' are connected to form a second electric leakage detection loop, and voltage terminals led out of two ends of the sampling resistors R2 and R2' are connected sequentially through a multiplexer switch, an operational amplifier, an analog to digital converter (ADC) module and a microprogrammed control unit (MCU) module. By means of the insulation detection circuit for the battery box, high resistance precise resistors R2 and R2' are used for performing voltage division measurement on two electric leakage detection loops of a battery, and thereby insulating conditions of the battery are real-timely and effectively monitored.

Description

The insulation detecting circuit that is used for battery case
Technical field
The utility model relates to a kind of battery case detection architecture, relates in particular to a kind of insulation detecting circuit for battery case.
Background technology
Battery management system (Battery Management System, be called for short BMS) be tie between battery and user, main object is secondary cell.Some shortcomings below secondary cell exists are as few in stored energy, the life-span is short, connection in series-parallel is used problem, safety in utilization, battery electric quantity estimation difficulty etc.The performance of battery is that very complicated, dissimilar battery behavior also differs greatly.Battery management system (BMS) is exactly mainly in order to improve the utilization factor of battery, prevents that battery from occurring overcharging and overdischarge, extends the serviceable life of battery, the state of monitoring battery.
Present battery case does not generally have insulation-monitoring function, can not be in real time and the dynamic variation that detects the insulation situation of battery case, be unfavorable for the safe handling of battery case.Therefore, be necessary to be provided for the insulation detecting circuit of battery case.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of insulation detecting circuit for battery case, can carry out in real time effectively monitoring to the insulation situation of battery.
The utility model is to solve the problems of the technologies described above the technical scheme that adopts to be to provide a kind of insulation detecting circuit for battery case, comprises a plurality of power brick that are cascaded; Wherein, described battery case shell leads to the detection of electrical leakage end, the positive terminal of described battery case, detection of electrical leakage end and sampling resistor R2 are connected and form the first leakage detecting circuit, and the negative pole end of described battery case, detection of electrical leakage end and sampling resistor R2 ' are connected and form the second leakage detecting circuit; Described sampling resistor R2, the double-end voltage terminal of R2 ' are connected with the MCU module through multidiameter option switch, operational amplifier, ADC module successively.
The above-mentioned insulation detecting circuit that is used for battery case, wherein, described sampling resistor R2 and loop resistance R1, isolation resistance R3, K switch m are cascaded and form the first voltage sampling loop; These two ends, the first voltage sampling loop are parallel with K switch p; Described sampling resistor R2 ' and loop resistance R1 ', isolation resistance R3 ' are cascaded and form the second voltage sampling loop; These two ends, the second road voltage sampling loop are parallel with K switch q.
The utility model contrast prior art has following beneficial effect: the insulation detecting circuit that is used for battery case that the utility model provides, utilizing high value precision resistance R2 and R2 ' to carry out dividing potential drop to battery two-way leakage detecting circuit measures, according to the equivalent insulation resistance value of battery plus-negative plate to housing, the insulation situation of battery is carried out effectively monitoring in real time, guarantee to only have the battery case of the good insulation electric automobile of just packing into to use, reduce due to the bad potential safety hazard of bringing of battery case insulation.
Description of drawings
Fig. 1 is the insulation detecting circuit structural representation for battery case of the present utility model.
In figure:
1, MCU module 2, ADC module 3, operational amplifier
4, multidiameter option switch
Embodiment
The utility model will be further described below in conjunction with drawings and Examples.
Fig. 1 is the insulation detecting circuit structural representation for battery case of the present utility model.
See also Fig. 1, the insulation detecting circuit that is used for battery case that the utility model provides comprises a plurality of power brick that are cascaded; Wherein, described battery case shell leads to the detection of electrical leakage end, the positive terminal of described battery case, detection of electrical leakage end and sampling resistor R2 are connected and form the first leakage detecting circuit, and the negative pole end of described battery case, detection of electrical leakage end and sampling resistor R2 ' are connected and form the second leakage detecting circuit; Described sampling resistor R2, the double-end voltage terminal of R2 ' are connected with MCU module 1 through multidiameter option switch 4, operational amplifier 3, ADC module 2 successively.
The insulation detecting circuit that is used for battery case that the utility model provides, described sampling resistor R2 and resistance R 1, resistance R 3, K switch m are cascaded and form the first voltage sampling loop; These two ends, the first voltage sampling loop are parallel with K switch p; Described sampling resistor R2 ' and resistance R 1 ', resistance R 3 ' being cascaded forms the second voltage sampling loop; These two ends, the second road voltage sampling loop are parallel with K switch q.For improve isolated measurement circuit and battery case shell, the detection of electrical leakage termination has master switch K1, disconnect when master switch K1 is flat, just only close when needs detect electric leakage.R1 and R1 ' are loop resistances, and resistance is large as far as possible, and its resistance size is the upper limit of the insulation detecting circuit leak resistance that can measure, and according to system requirements, this resistance is generally the tens megohm orders of magnitude.R2 and R2 ' are sampling resistors, are used for obtaining the dividing potential drop on it, thereby calculate the voltage of surveying.R3 and R3 ' are isolation resistances, are generally the per milles of R2, in order to improve the signal to noise ratio (S/N ratio) of measuring-signal.Rp and Rq are the biasing resistors of measuring insulation resistance, and the large I of its resistance is carried out flexible choice according to measuring accuracy and measurement range.
In sum, the insulation detecting circuit that is used for battery case that the utility model provides utilizes high value precision resistance R2 and R2 ' to carry out dividing potential drop to the battery total voltage and measures; By calculating anode, negative pole, the equivalent insulation resistance of housing is inferred the electric leakage situation, thereby the insulation situation of battery is carried out in real time effectively monitoring.
Although the utility model discloses as above with preferred embodiment; so it is not to limit the utility model; any those skilled in the art; within not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.

Claims (2)

1. an insulation detecting circuit that is used for battery case, comprise a plurality of power brick that are cascaded; It is characterized in that, described battery case shell leads to the detection of electrical leakage end, the positive terminal of described battery case, detection of electrical leakage end and sampling resistor R2 are connected and form the first leakage detecting circuit, and the negative pole end of described battery case, detection of electrical leakage end and sampling resistor R2 ' are connected and form the second leakage detecting circuit; Described sampling resistor R2, the double-end voltage terminal of R2 ' pass through successively multidiameter option switch (4), operational amplifier (3), ADC module (2) and MCU module (1) and are connected.
2. the insulation detecting circuit for battery case as claimed in claim 1, is characterized in that, described sampling resistor R2 and loop resistance R1, isolation resistance R3, K switch m are cascaded and form the first voltage sampling loop; These two ends, the first voltage sampling loop are parallel with K switch p; Described sampling resistor R2 ' and loop resistance R1 ', isolation resistance R3 ' are cascaded and form the second voltage sampling loop; These two ends, the second road voltage sampling loop are parallel with K switch q.
CN 201220633899 2012-11-26 2012-11-26 Insulation detection circuit for battery box Active CN202948104U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220633899 CN202948104U (en) 2012-11-26 2012-11-26 Insulation detection circuit for battery box

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220633899 CN202948104U (en) 2012-11-26 2012-11-26 Insulation detection circuit for battery box

Publications (1)

Publication Number Publication Date
CN202948104U true CN202948104U (en) 2013-05-22

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Country Status (1)

Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103033729A (en) * 2012-11-26 2013-04-10 浙江高泰昊能科技有限公司 Insulation detection circuit and detection method used for battery box
CN108072846A (en) * 2017-12-29 2018-05-25 河南北瑞电子科技有限公司 A kind of lithium battery insulation resistance on-line measuring device
CN111751755A (en) * 2020-06-30 2020-10-09 上海瓶安新能源科技有限公司 Insulation monitoring circuit of lithium battery pack and monitoring method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103033729A (en) * 2012-11-26 2013-04-10 浙江高泰昊能科技有限公司 Insulation detection circuit and detection method used for battery box
CN103033729B (en) * 2012-11-26 2016-01-20 浙江高泰昊能科技有限公司 For insulation detecting circuit and the detection method thereof of battery case
CN108072846A (en) * 2017-12-29 2018-05-25 河南北瑞电子科技有限公司 A kind of lithium battery insulation resistance on-line measuring device
CN111751755A (en) * 2020-06-30 2020-10-09 上海瓶安新能源科技有限公司 Insulation monitoring circuit of lithium battery pack and monitoring method thereof

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