CN207198307U - A kind of lithium battery interior micro-short circuit detection means - Google Patents
A kind of lithium battery interior micro-short circuit detection means Download PDFInfo
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- CN207198307U CN207198307U CN201721094756.2U CN201721094756U CN207198307U CN 207198307 U CN207198307 U CN 207198307U CN 201721094756 U CN201721094756 U CN 201721094756U CN 207198307 U CN207198307 U CN 207198307U
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Abstract
The utility model discloses a kind of lithium battery interior micro-short circuit detection means, the lithium battery voltage wave filtering circuit and difference amplifying circuit and six and half high accuracy number universal meters of output voltage including the reference voltage generating circuit for producing reference voltage, for gathering lithium battery to be detected, difference amplifying circuit exports after the difference between reference voltage and the output voltage of lithium battery is amplified to be detected to six and half high accuracy number universal meters.The utility model, cell voltage tracking mode difference plus and blowup technology is used, the defective products battery of internal micro-short circuit in lithium battery manufacturing process can quickly be identified, significantly shorten the recognition time that the cell voltage caused by self-discharge of battery caused by lithium battery micro-short circuit declines, original lithium battery self discharge process cycle is significantly shortened, effectively reduce battery manufacture cost.This circuit realiration is simple, practical, safe and reliable.
Description
Technical field
It the utility model is related to technical field of lithium battery detection, and in particular to a kind of lithium battery interior micro-short circuit detection dress
Put.
Background technology
The capacity of lithium battery is increasing at present, especially power train in vehicle application lithium battery, and its internal micro-short circuit electric current can be made
Into lithium battery self discharge, cell voltage is caused very slowly to decline, so as to form defective products battery.However, in lithium battery system
During making, due to reasons such as material, technique, equipment, the generation of micro-short circuit can not avoid completely.
Therefore, lithium battery is typically necessary the internal micro-short circuit detection of progress before dispatching from the factory, to avoid defective products battery from dispatching from the factory.So
It is therefore, most of and six and half conventional high accuracy number universal meters are difficult to the data for measuring voltage decline in a short time
Battery manufacture producer be all re-test voltage landing, whether to judge lithium battery interior after storage long period (6-10 days)
Micro-short circuit be present.But this mode causes lithium battery manufacturing process cycle stretch-out, cost of manufacture rises.And higher precision
Digital multimeter it is expensive and harsh to onsite application environmental requirement, it is difficult to be applied to the manufacture scene of lithium battery.
As can be seen here, it is badly in need of providing a kind of new detection technique, lithium battery interior is gone out with the presence or absence of micro- short with quick detection
Road, improve the yields of lithium battery.
Utility model content
Technical problem to be solved in the utility model is the mode that existing detection lithium battery interior whether there is micro-short circuit
Manufacturing process cycle stretch-out can be caused, the problem of cost of manufacture rises.
In order to solve the above-mentioned technical problem, to be to provide a kind of lithium battery interior micro- for technical scheme used by the utility model
Short-circuit detecting device, reference voltage generating circuit, for producing reference voltage；
Lithium battery voltage wave filtering circuit, for gathering the output voltage of lithium battery to be detected；
Difference amplifying circuit, exported after the difference between reference voltage and the output voltage of lithium battery is amplified；
Six and half high accuracy number universal meters, between the reference voltage and the output voltage of lithium battery after detection amplification
Difference.
In such scheme, the reference voltage generating circuit includes：
Voltage reference chip；
DC reference power supply, its positive and negative electrode connect the V of voltage reference chip respectivelyinPin and GND pin；
Adjustable potentiometer, both ends connect the V of voltage reference chip respectivelyoutPin and signal ground, centre tap end connection battery
Voltage and reference voltage difference amplifying circuit, the V of voltage reference chipoutThe first electric capacity of clutter reduction is also associated with pin.
In such scheme, the lithium battery voltage wave filtering circuit includes：
First amplifier, the positive and negative electrode of lithium battery to be detected connect the V of the first amplifier respectively+ inPin and V- inPin；
First resistor, one end connect the first amplifier U3 V0Pin, other end connection cell voltage and reference voltage difference
Amplifying circuit；
Second electric capacity, one end connect the output end of first resistor, other end connection signal ground.
In such scheme, the cell voltage and reference voltage difference amplifying circuit, can using difference amplifier
Adjust the V of the centre tap end connection difference amplifier of potentiometer- inPin, two R of difference amplifierGPin connects second resistance, uses
In the gain digit of setting difference amplifier, the V of difference amplifier+ inThe other end of second resistance is connected, after differential signal amplification
By the V of difference amplifier0Pin is exported to six and half high accuracy number universal meters.
The utility model, cell voltage tracking mode difference plus and blowup technology is used, can quickly identify lithium battery
The defective products battery of internal micro-short circuit in manufacturing process, significantly shortening the self-discharge of battery because of caused by lithium battery micro-short circuit causes
Cell voltage decline recognition time, original lithium battery self discharge process cycle is significantly shortened, effectively reduce battery system
This is caused, and circuit realiration is simple, practical, it is safe and reliable.
Brief description of the drawings
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
The utility model provides a kind of lithium battery interior micro-short circuit detection means, can quick detection go out lithium battery interior
With the presence or absence of micro-short circuit, the productivity ratio of lithium battery is improved, reduces cost.With reference to specification drawings and specific embodiments pair
The utility model is described in detail.
As shown in figure 1, inside battery micro-short circuit detection means provided by the utility model, including precision voltage reference production
Raw circuit 10, lithium battery voltage wave filtering circuit 20, cell voltage and reference voltage difference amplifying circuit 30 and six and half
High accuracy number universal meter 40.
Precision voltage reference generation circuit 10 is used to produce high-precision reference voltage, including 12V DC with reference to (confession
Electricity) power supply, high-precision voltage reference chip U1 (REF5050) and high-precision adjustable potentiometer VR1.Wherein, 12V DC is with reference to electricity
The positive and negative electrode in source connects high-precision voltage reference chip U1 2 pin (V respectivelyin) and 4 pin (GND), high-precision voltage reference source U1
6 pin on be also associated with the first electric capacity C2, the first electric capacity C2 the other end connection signal ground, realize the suppression to reference voltage clutter
System, the pin of VR1 adjustable potentiometers 1 connect U1 6 pin (Vout), 3 pin connection signal ground, 2 pin (middle plug end) connection cell voltage
With reference voltage difference amplifying circuit 30, using high-precision adjustable potentiometer VR1 centre tap end, to reference voltage difference
The differential amplification reference voltage that the output of amplifying circuit 30 needs.
Lithium battery voltage wave filtering circuit 20 by the first high-precision instrumentation amplifier U3 (INA128), first resistor R2 and
Second electric capacity C5 is formed, wherein, the positive and negative electrode of lithium battery to be detected connects the 3 of the first high-precision instrumentation amplifier U3 respectively
Pin (V+ in) and 2 pin (V- in), first resistor R2 one end connects the first high-precision instrumentation amplifier U3 6 pin (V0), the other end connects
Connect the second electric capacity C5 one end, the second electric capacity C5 other end connection signal ground.First high-precision instrumentation amplifier U3 realizations pair
The unit gain collection of lithium battery voltage, first resistor R2 and the second electric capacity C5 compose in parallel RC low pass filters.
Cell voltage, using difference amplifier U2 (INA128), in high precision may be used with reference voltage difference amplifying circuit 30
Adjust potentiometer VR1 2 pin connection difference amplifier U2 2 pin (V- in), output difference amplification reference voltage.Second resistance R1's
Both ends difference difference amplifier U2 1 pin and 8 pin (RG,RG), for setting difference amplifier U2 gain digit, such as R1 resistances
It is worth for 100 ohm, corresponding U2 gains are 501 times.
Difference amplifier U2 3 pin (V+ in) connection first resistor R2 the other end (output end), difference amplifier U2's
2 pin (V- in) the high-precision adjustable potentiometer VR1 of connection 2 pin differential amplification reference voltages output end (centre tap end), difference
By U2 6 pin (V after signal amplification0) it is output to the input of six and half high accuracy number universal meters 40, the six and half high-precision number of degrees
Lithium battery voltage dropping signal after the measuring and amplifying of word universal meter 40.
Operation principle of the present utility model is as follows：
Precision voltage reference generation circuit 10 produces 5.000V precision voltage references, lithium battery voltage sampling filter electricity
Road 20 gathers the output voltage of lithium battery to be detected, and by cell voltage and reference voltage difference amplifying circuit 30 to benchmark electricity
Pressure and the difference of sampled voltage therebetween are amplified, and are then output to the measuring and amplifying of six and half high accuracy number universal meter 40
Lithium battery voltage dropping signal afterwards, so as to judge that lithium battery interior whether there is micro-short circuit.
The advantages of the utility model, is as follows：
(1) circuit is simple and practical, in the case where equipment cost is not high, realizes the quick knowledge of lithium battery interior micro-short circuit
Not.
(2) circuit requires relatively low to site environment, and application is convenient.
The utility model is not limited to above-mentioned preferred forms, and anyone should learn that under enlightenment of the present utility model
The structure change made, it is every that there is same or like technical scheme with the utility model, each fall within guarantor of the present utility model
Within the scope of shield.
Claims (4)
- A kind of 1. lithium battery interior micro-short circuit detection means, it is characterised in that including：Reference voltage generating circuit, for producing reference voltage；Lithium battery voltage wave filtering circuit, for gathering the output voltage of lithium battery to be detected；Difference amplifying circuit, exported after the difference between reference voltage and the output voltage of lithium battery is amplified；Six and half high accuracy number universal meters, the difference between output voltage for detecting the reference voltage and lithium battery after amplifying Value.
- 2. lithium battery interior micro-short circuit detection means as claimed in claim 1, it is characterised in that the reference voltage produces electricity Road includes：Voltage reference chip；DC reference power supply, its positive and negative electrode connect the V of voltage reference chip respectivelyinPin and GND pin；Adjustable potentiometer, both ends connect the V of voltage reference chip respectivelyoutPin and signal ground, centre tap end connection cell voltage With reference voltage difference amplifying circuit, the V of voltage reference chipoutThe first electric capacity of clutter reduction is also associated with pin.
- 3. lithium battery interior micro-short circuit detection means as claimed in claim 2, it is characterised in that the lithium battery voltage sampling Filter circuit includes：First amplifier, the positive and negative electrode of lithium battery to be detected connect the V of the first amplifier respectively+ inPin and V- inPin；First resistor, one end connect the first amplifier U3 V0Pin, other end connection cell voltage and reference voltage difference amplification electricity Road；Second electric capacity, one end connect the output end of first resistor, other end connection signal ground.
- 4. lithium battery interior micro-short circuit detection means as claimed in claim 3, it is characterised in that the cell voltage and benchmark Voltage difference amplifying circuit is using difference amplifier, the V of the centre tap end connection difference amplifier of adjustable potentiometer- in Pin, two R of difference amplifierGPin connects second resistance, for setting the gain digit of difference amplifier, difference amplifier V+ inThe other end of second resistance is connected, by the V of difference amplifier after differential signal amplification0Pin is exported to the six and half high-precision number of degrees Word universal meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721094756.2U CN207198307U (en) | 2017-08-29 | 2017-08-29 | A kind of lithium battery interior micro-short circuit detection means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721094756.2U CN207198307U (en) | 2017-08-29 | 2017-08-29 | A kind of lithium battery interior micro-short circuit detection means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207198307U true CN207198307U (en) | 2018-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721094756.2U Active CN207198307U (en) | 2017-08-29 | 2017-08-29 | A kind of lithium battery interior micro-short circuit detection means |
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| Country | Link |
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| CN (1) | CN207198307U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336346A (en) * | 2019-06-26 | 2019-10-15 | 南京中感微电子有限公司 | Battery protecting circuit with micro-short circuit detection |
| CN110501654A (en) * | 2019-09-19 | 2019-11-26 | 深圳市众能达自动化设备有限公司 | A kind of detection device and its detection method of inside battery micro-short circuit |
-
2017
- 2017-08-29 CN CN201721094756.2U patent/CN207198307U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336346A (en) * | 2019-06-26 | 2019-10-15 | 南京中感微电子有限公司 | Battery protecting circuit with micro-short circuit detection |
| CN110501654A (en) * | 2019-09-19 | 2019-11-26 | 深圳市众能达自动化设备有限公司 | A kind of detection device and its detection method of inside battery micro-short circuit |
| CN110501654B (en) * | 2019-09-19 | 2020-11-24 | 深圳市众能达自动化设备有限公司 | Detection device and detection method for micro short circuit inside battery |
| WO2021051449A1 (en) * | 2019-09-19 | 2021-03-25 | 深圳市众能达自动化设备有限公司 | Apparatus and method for detecting internal micro short circuit of battery |
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