CN109738829A - A kind of battery pack Insulation Inspection System and detection method - Google Patents
A kind of battery pack Insulation Inspection System and detection method Download PDFInfo
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- CN109738829A CN109738829A CN201811548670.1A CN201811548670A CN109738829A CN 109738829 A CN109738829 A CN 109738829A CN 201811548670 A CN201811548670 A CN 201811548670A CN 109738829 A CN109738829 A CN 109738829A
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- battery pack
- current
- chip microcontroller
- current detection
- insulation
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Abstract
The invention discloses a kind of battery pack Insulation Inspection System and detection methods, wherein system are as follows: battery pack includes multiple battery modules, draw terminals in the both ends of each battery modules, the electrode of adjacent cell mould group shares a piece-root grafting line end, multiple terminals are separately connected corresponding current detection circuit one end, and the other end of current detection circuit is grounded after being connected with each other；The current detection circuit includes switch, detection resistance, current detecting unit, and the current detecting unit is connect after passing through signal processing circuit with single-chip microcontroller, and the single-chip microcontroller is connect with the switch of each current detection circuit respectively.The present invention has the advantages that can detecte the insulation situation of battery pack internal cell mould group and issue alarm, power-off control in time etc., the approximate range that can be further occurred according to the electric current multilevel iudge insulation fault between two terminals, and find the failure that can obtain more accurate battery modules after corresponding range by further verifying.
Description
Technical field
The present invention relates to power battery detection field, in particular to a kind of cell p ack Insulation Inspection System and detection side
Method.
Background technique
With the fast development of national new energy industry, to meet the market demand, each field is to lithium battery power supply system
Energy grade and voltage class require also stepping up, and lithium battery power supply system all has characteristic in groups, i.e. battery system at present
Core component in system is several battery modules battery Pack in series, i.e. battery Pack by n battery modules according to
Secondary in series, each battery modules are made of at least one single battery.In face of the battery system of high voltage, high-energy density
System, the battery system internal fault caused by defective insulation is also most commonly seen, internal discharge, the internal short-circuit band caused by it
The harm come is also maximum, therefore how to improve its safety in utilization, realizes the automatic detecting of state of insulation, checks automatically, is automatic
The functions such as early warning and automatic protection, the safety integrally used system, reliability and stability all have irreplaceable weight
Meaning is wanted, and realizes that the core component of this defencive function is its Insulation monitoring unit.
Groups of electrokinetic cell system conventional at present, mostly use system master just, main negative part setting insulation detection device,
Realize the Insulation monitoring of system, which can upload in time fault message, just when defective insulation occurs for system arbitrary point
In remote monitoring, but which can not accurately determine the insulation fault position of internal battery pack,
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of battery modules Insulation Inspection System and sides
Method, for detecting the insulation situation of battery PACK internal model group.
To achieve the goals above, the technical solution adopted by the present invention are as follows: a kind of battery pack Insulation Inspection System, the electricity
Chi Bao includes multiple battery modules, and terminals are drawn at the both ends of each battery modules, and the electrode of adjacent cell mould group shares one
Piece-root grafting line end, multiple terminals are separately connected corresponding current detection circuit one end, and the other end of current detection circuit mutually interconnects
It is grounded after connecing；The current detection circuit includes switch, detection resistance, current detecting unit, and the current detecting unit passes through
It is connect after signal processing circuit with single-chip microcontroller, the single-chip microcontroller is connect with the switch of each current detection circuit respectively.
The signal processing circuit includes operation amplifier circuit, filter circuit, A/D converter circuit, and current signal successively passes through
Single-chip microcontroller is sent to after crossing operation amplifier circuit, filter circuit, A/D converter circuit.
The single-chip microcontroller is connect with alarm and display respectively, for showing testing result and alarm.
A kind of detection method of battery pack Insulation Inspection System, includes the following steps:
Step 1: starting Insulation monitoring；
Step 2: single-chip microcontroller controls closing the switch in the two of them current detection circuit in multiple current detection circuits,
So that forming electrical circuit between two current detection circuits；
Step 3: single-chip microcontroller obtains the current data of the current detecting unit in two current detection circuits and is compared
Compared with thinking two wiring corresponding in the two current detection circuits at this time when the two current data differs by more than given threshold
There is insulation fault in battery modules between end.
Further include step 4: after judging insulation fault, single-chip microcontroller controls alarm and issues alarm and by display insulation institute
In position.
Further include step 5, after judging insulation fault, single-chip microcontroller output control signals to the master of battery pack just/it is main it is negative after
Electric appliance is to control battery pack power-off.
The present invention has the advantages that can detecte the insulation situation of battery pack internal cell mould group and in time issue alarm,
Power-off control etc., the substantially model that can be further occurred according to the electric current multilevel iudge insulation fault between two terminals
It encloses, and finds the failure that can obtain more accurate battery modules after corresponding range by further verifying.
Detailed description of the invention
Below to each width attached drawing of description of the invention expression content and figure in label be briefly described:
Fig. 1 is detection system structure of the present invention；
Fig. 2 is the signal condition schematic diagram of detection system of the present invention.
Specific embodiment
A specific embodiment of the invention is made further detailed below against attached drawing by the description to optimum embodiment
Thin explanation.
A kind of battery pack Insulation Inspection System, battery pack include multiple battery modules, and the both ends of each battery modules are drawn
Terminals out, the electrode of adjacent cell mould group share a piece-root grafting line end, and multiple terminals are separately connected corresponding current detecting electricity
Road one end, the other end of current detection circuit are grounded after being connected with each other；Current detection circuit includes switch, detection resistance, electric current
Detection unit, the current detecting unit pass through signal processing circuit after connect with single-chip microcontroller, the single-chip microcontroller respectively with it is each
The switch of a current detection circuit connects.Signal processing circuit includes operation amplifier circuit, filter circuit, A/D converter circuit,
Current signal is successively sent to single-chip microcontroller after operation amplifier circuit, filter circuit, A/D converter circuit.Single-chip microcontroller respectively with
Alarm is connected with display, for showing testing result and alarm.
As shown in Figure 1, system includes n mould group on battery Pack, i.e. mould group 1, mould group 2, mould group 3 ... mould group n, mould
Group 1 to mould group n is sequentially connected in series to form battery PACK, has a terminals, adjacent electricity in the positive and negative anodes position of each mould group
A terminals are shared between Chi Mo group positive and negative anodes, that is, each battery modules of n share n+1 terminals, each terminals point
Not Lian Jie current detection circuit, current detection circuit includes detection resistance, reverse-blocking tetrode thyristor, current detecting unit, this wiring
End passes through detection resistance Rx and corresponding reverse-blocking tetrode thyristor BTx (x is the corresponding serial number of mould group) corresponding current detecting of connection
Module, by taking mould group n as an example, the both ends anode of mould group n corresponds to R you, BTn and corresponding current transformer.From first mould group
Cathode starts to n-th of mould group anode to terminate, and sequence is followed successively by (R-, BT-), (R1, BT1), (R2, BT2), (R3, BT3) ...
(Rn, BTn), total n+1 group detection resistance and reverse-blocking tetrode thyristor pipe.Every group corresponding, and to be both provided with current sensor detection corresponding
Current signal.
Current signal is transferred in single-chip microcontroller after signal conditioning circuit and is analyzed and processed.The insulation of the application judges
Method is the detection by electric current compared with, as shown in Fig. 2, being the processing circuit of electric current, R0 is that the input of operational amplifier limits
Flow protective resistance: R1 and Cl forms feedback compensation network, reduces bandwidth, prevents R1, R2, R3 and Q phase shift from generating self-oscillation；R1
T-type resistor network is formed with R2, R3, further to be amplified to micro-current, amplification coefficient expression formula is (1+R3/
R2)*Rl；R4 and C2 forms low-pass filter, to filter out the high frequency noise of amplifier；Voltage amplification unit comprising A/D conversion,
Useful analog circuit amplification, also useful program-controlled voltage amplifier (specialized voltages amplification chip) is amplified, it is by monolithic at this time
The control of machine；Single-chip microcontroller mainly serves as control and calculating task, may be implemented to change the functions such as range, automatic zero adjustment, Ci Zhongfang certainly
The rank for the micro-current that method can amplify is generally possible to accurately be amplified to pA grades of electricity depending on the comprehensive performance of operational amplifier
Stream.
The detection method of Insulation Inspection System, includes the following steps:
Step 1: starting Insulation monitoring；Entry condition, such as periodically detection can be preset in single-chip microcontroller.
Step 2: single-chip microcontroller controls closing the switch in the two of them current detection circuit in multiple current detection circuits,
So that forming electrical circuit between two current detection circuits；
Step 3: single-chip microcontroller obtains the current data of the current detecting unit in two current detection circuits and is compared
Compared with thinking two wiring corresponding in the two current detection circuits at this time when the two current data differs by more than given threshold
There is insulation fault in battery modules between end.If it is the positive and negative anodes of a mould group that the two terminals are corresponding, then can
It is that the mould group insulation fault occurs with judgement.If the corresponding current deviation of the terminals at 1 both ends of mould group is greater than given threshold, then sentence
There is insulation fault in mould group 1 between disconnecting line end.
Step 4: after judging insulation fault, single-chip microcontroller controls alarm and issues alarm and by showing insulation institute in place
It sets.
Step 5, after judging insulation fault, single-chip microcontroller output control signals to the master of battery pack just/main negative relay with
Control battery pack power-off.
Such as Fig. 1, Insulation monitoring single-chip microcontroller is in order according to the pass of fixed cycle and fixed sequence program control reverse-blocking tetrode thyristor pipe
It closes and is connected, to realize the detection of a certain mould group.For example for, when the insulation performance of mould group 1 to be detected, CPU is only closed
BT- and BT1, other switching tubes are all off, in this way, battery modules 1 are equivalent to power supply, R- and R1 constitute closed circuit, work as mould
There is Abnormal Insulation (dotted line Ra value is too small on the way, causes Ra and R1 in parallel, and shunt) in the anode of group 1, passes through R- electricity in this way
It flows the value of detection unit and a deviation is just had by the value of R1 current detecting unit, be one threshold value of this deviation setting,
When current deviation be more than the threshold value, then judge insulation fault herein, herein 1 failure of battery modules.
In entire Pack overall insulation context of detection: only need to be closed BT- and BTn, detection and the concatenated current value of BT- and
And the deviation of the concatenated micro-current value of BTn, is arranged a threshold value, when current deviation value is greater than given threshold, that is, can determine whether whole
The insulation performance of a Pack.
The corresponding current detection circuit of terminals at the both ends of any battery modules, when single-chip microcontroller controls the battery mould
When the silicon-controlled closure of corresponding two terminals of group, can detect at this time the battery modules whether insulation fault.In monolithic
Detection cycle is preset in machine, single-chip microcontroller is detected according to period fixed starting.Be arranged in single-chip microcontroller detection when about logic, will
The energization of each battery modules both ends terminals is successively preset in single-chip microcontroller, then when starting detection cycle, according to pre-
If the corresponding detection of the battery modules of logic one by one, mould group 1 two electric currents are such as first detected, in detection 2 both ends electric current of mould group
Until mould group n, in this case, once the mould group of failure can quickly be known by breaking down.And it can be by mould group n anode
Energization with 1 cathode of mould group come judge entirely to connect pack whether insulation fault.And detect mould group both ends one by one by the period
Electric current can be then which mould group insulation fault occurs with accurate judgement.
It can be opened by the closure of single-chip microcontroller oneself control reverse-blocking tetrode thyristor pipe, saving the time, (the driving contactor time is long-range
In silicon-controlled)；On the other hand, the present invention, can be by the insulation performance of each mould group of fixed cycle inspection, in real time then without this sorrow
The element for reporting the present invention to use is smaller, greatly reduces the cost and weight of battery backpack body, improves battery energy density ratio
And space utilization rate.The microelectronics detection device used is directly carried out using degree of precision operational amplifier, is examined for I-V conversion
The defects of survey current precision is up to pA grades, improves the prior art using current transformer, and structure is complicated, and precision is low, at high cost.
Obviously present invention specific implementation is not subject to the restrictions described above, as long as using method concept and skill of the invention
The improvement for the various unsubstantialities that art scheme carries out, it is within the scope of the present invention.
Claims (6)
1. a kind of battery pack Insulation Inspection System, it is characterised in that: the battery pack includes multiple battery modules, each battery mould
Terminals are drawn at the both ends of group, and the electrode of adjacent cell mould group shares a piece-root grafting line end, and multiple terminals are separately connected correspondence
Current detection circuit one end, the other end of current detection circuit is grounded after being connected with each other；The current detection circuit includes opening
Pass, detection resistance, current detecting unit, the current detecting unit is connect after passing through signal processing circuit with single-chip microcontroller, described
Single-chip microcontroller is connect with the switch of each current detection circuit respectively.
2. a kind of battery pack Insulation Inspection System as described in claim 1, it is characterised in that: the signal processing circuit includes
Operation amplifier circuit, filter circuit, A/D converter circuit, current signal successively pass through operation amplifier circuit, filter circuit, AD
Single-chip microcontroller is sent to after conversion circuit.
3. a kind of battery pack Insulation Inspection System as claimed in claim 1 or 2, it is characterised in that: the single-chip microcontroller respectively with
Alarm is connected with display, for showing testing result and alarm.
4. a kind of detection method of battery pack Insulation Inspection System a method according to any one of claims 1-3, it is characterised in that: including
Following steps:
Step 1: starting Insulation monitoring；
Step 2: single-chip microcontroller controls closing the switch in the two of them current detection circuit in multiple current detection circuits, so that
Electrical circuit is formed between two current detection circuits；
Step 3: single-chip microcontroller obtains the current data of the current detecting unit in two current detection circuits and is compared, two
When person's current data differs by more than given threshold, thought between corresponding two terminals of the two current detection circuits at this time
Battery modules there is insulation fault.
5. a kind of detection method of battery pack Insulation Inspection System as claimed in claim 4, it is characterised in that: further include step
4: after judging insulation fault, single-chip microcontroller controls alarm and issues alarm and by display insulation position.
6. a kind of detection method of battery pack Insulation Inspection System as claimed in claim 5, it is characterised in that: further include step
5, after judging insulation fault, single-chip microcontroller output control signals to the master of battery pack just/main negative relay is disconnected to control battery pack
Electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811548670.1A CN109738829A (en) | 2018-12-18 | 2018-12-18 | A kind of battery pack Insulation Inspection System and detection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811548670.1A CN109738829A (en) | 2018-12-18 | 2018-12-18 | A kind of battery pack Insulation Inspection System and detection method |
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| CN109738829A true CN109738829A (en) | 2019-05-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965498A (en) * | 2020-07-22 | 2020-11-20 | 东方电气集团东方电机有限公司 | Automatic inspection and fault positioning device for insulation state of hydraulic generator screw |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454498A (en) * | 2013-08-08 | 2013-12-18 | 许继集团有限公司 | Insulation detection method of electric vehicle power battery pack |
| CN105676091A (en) * | 2016-03-04 | 2016-06-15 | 中航锂电（洛阳）有限公司 | Battery pack insulation detection apparatus and insulation detection method thereof |
| CN207630978U (en) * | 2017-11-21 | 2018-07-20 | 简式国际汽车设计（北京）有限公司 | Battery pack insulation fault location device |
-
2018
- 2018-12-18 CN CN201811548670.1A patent/CN109738829A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454498A (en) * | 2013-08-08 | 2013-12-18 | 许继集团有限公司 | Insulation detection method of electric vehicle power battery pack |
| CN105676091A (en) * | 2016-03-04 | 2016-06-15 | 中航锂电（洛阳）有限公司 | Battery pack insulation detection apparatus and insulation detection method thereof |
| CN207630978U (en) * | 2017-11-21 | 2018-07-20 | 简式国际汽车设计（北京）有限公司 | Battery pack insulation fault location device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965498A (en) * | 2020-07-22 | 2020-11-20 | 东方电气集团东方电机有限公司 | Automatic inspection and fault positioning device for insulation state of hydraulic generator screw |
| CN111965498B (en) * | 2020-07-22 | 2023-01-24 | 东方电气集团东方电机有限公司 | Automatic inspection and fault positioning device for insulation state of hydraulic generator screw |
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Application publication date: 20190510 |
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