CN206908279U - A kind of lithium battery group overtemperature and overcurrent double protecting device - Google Patents
A kind of lithium battery group overtemperature and overcurrent double protecting device Download PDFInfo
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- CN206908279U CN206908279U CN201720426980.0U CN201720426980U CN206908279U CN 206908279 U CN206908279 U CN 206908279U CN 201720426980 U CN201720426980 U CN 201720426980U CN 206908279 U CN206908279 U CN 206908279U
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- circuit
- switch pipe
- lithium battery
- battery group
- switch
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Abstract
It the utility model is related to a kind of lithium battery group overtemperature and overcurrent double protecting device; including battery management system, lithium battery group, on-off circuit and a thermal-shutdown circuit, a current foldback circuit; temperature detection is realized using the thermal resistor PTC for being close to lithium battery group; current foldback circuit can also realize overcurrent protection when sampling resistor is smaller simultaneously; reduce the loss on power line; the utility model also has modularized design; compact, reliable operation, the features such as integrated circuit is simple in construction.
Description
【Technical field】
A kind of lithium battery pack protecting device is the utility model is related to, particularly a kind of lithium battery group overtemperature and overcurrent duplicate protection
Device.
【Background technology】
At present, the application of the various electric tools of developing rapidly with electronic technology, such as electric motor car is increasingly extensive.On
The power for stating electric tool uses lithium battery multi-section serial more, and four sections and the following lithium battery series connection of four sections in the market is
There is more ripe integrated chip to carry out effective charge and discharge protecting to it, and it is by multiple that the series connection for the four section above is then mostly
Miscellaneous peripheral circuit is protected.And most of lithium battery group protection circuits are by setting equalizing circuit to monitor each electricity
Pond, when super-charge super-discharge occurs for any cell, whole peripheral circuit is shut off, the situation of temperature protection and overcurrent protection
It is similar.Current equalizing circuit is realized in balanced branching process, if some equalizing circuit of battery strings UNPROFOR protection circuit is abnormal,
If not in time excision can cause lithium battery cross put, excess temperature phenomenon, have influence on the battery packs of other normal works, or even easily trigger
Lithium battery explodes.But realize that lithium battery group overtemperature and overcurrent protection circuit is most of complicated at present, reliability is low.
【Utility model content】
Technical problem to be solved in the utility model is：It is necessary to provide a kind of lithium battery group overtemperature and overcurrent duplicate protection
Device, with the overtemperature and overcurrent phenomenon occurred when preventing internal battery pack from occurring abnormal.
In order to solve the above technical problems, the technical solution of the utility model is：A kind of dual guarantor of lithium battery group overtemperature and overcurrent
Protection unit, the protection device include lithium battery group, battery management system, on-off circuit, thermal-shutdown circuit and overcurrent protection
Circuit；The thermal-shutdown circuit includes the positive temperature coefficient thermistor PTC for being close to lithium battery group, when temperature was increased to
During temperature detection value, battery management system protection chip output high level, controlling switch circuit disconnects whole discharge loop；
Sampling resistor, the first switch pipe and second that the current foldback circuit includes being used to be connected in load circuit are opened
Guan Guan, the both ends of sampling resistor are connected with the input of first switch pipe and one end of mu balanced circuit respectively, first switch pipe
Output end is connected with the control terminal of second switch, and voltage stabilizing electricity is serially connected between described sampling resistor and first switch pipe control terminal
Road；Described mu balanced circuit include a reference source and with a reference source and the divider resistance that connects, the grid control terminal of first switch pipe with
Bleeder circuit node caused by a reference source connects；The output end of described first switch pipe is connect by thermistor and current-limiting resistance
Ground；Described first switch pipe and second switch pipe are metal-oxide-semiconductor.
Compared with prior art, the utility model has the following advantages that：
Protection device of the present utility model can realize the overtemperature and overcurrent protection to lithium battery group, and used circuit simultaneously
Element is few, and integrated circuit is simple in construction, and reliability is high, cost-effective.
【Brief description of the drawings】
Fig. 1 is the system block diagram of lithium battery group overtemperature and overcurrent double protecting device of the present utility model.
Fig. 2 is the structural representation of current foldback circuit of the present utility model.
【Embodiment】
The utility model is described in further detail with reference to embodiment and accompanying drawing, but implementation of the present utility model
Mode not limited to this.
It is lithium battery group overtemperature and overcurrent protection device system block diagram of the present utility model as shown in Figure 1, including lithium battery group,
Battery management system, on-off circuit, thermal-shutdown circuit and current foldback circuit；Thermal-shutdown circuit is by existing maturation
Protection chip packet protection is carried out to battery, in the present embodiment, thermal-shutdown circuit, which includes, is close to the positive temperature of battery pack
Coefficient thermal resistor PTC, when temperature is increased to excess temperature detected value, protection chip output high level, controlling switch circuit
Disconnect whole discharge loop.Because the such temperature protection of each baby battery group, effective temperature can be carried out to whole battery
The drawbacks of spending monitoring, therefore the temperature for drawing single thermistor to detect whole battery pack can be avoided.
Lithium battery group current foldback circuit of the present utility model as shown in Figure 2, including sampling resistor, first switch pipe and
Second switch pipe, the both ends of sampling resistor are connected with the input and control terminal of first switch pipe respectively, first switch pipe it is defeated
Go out end with the control terminal of second switch to be connected, by concatenating mu balanced circuit between sampling resistor and first switch pipe control terminal,
When dc source output current is excessive or current limliting needs to protect, the divider resistance that sampling resistor is set with the string in mu balanced circuit concatenates
Being sampled afterwards, under the divider resistance effect in sampling resistor and mu balanced circuit, the voltage of the control terminal of first switch pipe
Reach the threshold voltage of switching tube conducting, now first switch pipe turns on, the output end voltage rise of first switch pipe, and first
The output end of switching tube is connected with the control terminal of second switch pipe again, and the voltage of second switch pipe control terminal also accordingly raises, the
The cut-off of two switching tubes, whole circuit will be obstructed, so as to realize the mesh that overcurrent protection can be also realized when sampling resistor is smaller
's.
In addition, environment temperature rise can cause switching tube turn on threshold voltage decreasing, now, in current-limiting protection circuit by
In the threshold voltage decreasing of switching tube conducting current-limiting protection circuit can be caused to enter guard mode in advance, it is impossible to normal use,
Therefore, being grounded as shown in Figure 1 after PMOS T1 drain electrode end concatenation one thermistor VR1 and current-limiting resistance R1, pass through temperature-sensitive
Resistance VR1 and resistance R1 effect, metal-oxide-semiconductor threshold voltage reduces the influence to caused by circuit when compensation temperature raises.Its work
Principle is as follows：Not up to current limit threshold when, if temperature raises, PMOS T1 threshold voltage reduces, and PMOS T1 enters in advance
Conducting state, T1 drain electrodes produce Weak current to ground, and the caused voltage drop on thermistor VR1 and resistance R1 of this electric current can drop
Effect that is low, maintaining T1 drain potentials to be basically unchanged, on the contrary then there is opposite Adjustment effect when environment temperature reduces.No matter temperature
How to change, within the specific limits, crossing current circuit being capable of normal use.
Claims (1)
1. a kind of lithium battery group overtemperature and overcurrent double protecting device, the protection device includes lithium battery group, battery management system, opened
Powered-down road, thermal-shutdown circuit and current foldback circuit, it is characterised in that
The thermal-shutdown circuit includes the positive temperature coefficient thermistor PTC for being close to lithium battery group, when temperature was increased to
During temperature detection value, battery management system protection chip output high level, controlling switch circuit disconnects whole discharge loop；
The current foldback circuit includes being used for sampling resistor, first switch pipe and the second switch being connected in load circuit
Pipe, the both ends of sampling resistor are connected with the input of first switch pipe and one end of mu balanced circuit respectively, first switch pipe it is defeated
Go out end with the control terminal of second switch to be connected, voltage stabilizing electricity is serially connected between described sampling resistor and first switch pipe control terminal
Road；Described mu balanced circuit include a reference source and with a reference source and the divider resistance that connects, the grid control terminal of first switch pipe with
Bleeder circuit node caused by a reference source connects：The output end of described first switch pipe is connect by thermistor and current-limiting resistance
Ground：Described first switch pipe and second switch pipe are metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720426980.0U CN206908279U (en) | 2017-04-21 | 2017-04-21 | A kind of lithium battery group overtemperature and overcurrent double protecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720426980.0U CN206908279U (en) | 2017-04-21 | 2017-04-21 | A kind of lithium battery group overtemperature and overcurrent double protecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206908279U true CN206908279U (en) | 2018-01-19 |
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ID=61290957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720426980.0U Active CN206908279U (en) | 2017-04-21 | 2017-04-21 | A kind of lithium battery group overtemperature and overcurrent double protecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206908279U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108988293A (en) * | 2018-07-27 | 2018-12-11 | 南昌黑鲨科技有限公司 | Thermal-shutdown circuit and data line with it |
-
2017
- 2017-04-21 CN CN201720426980.0U patent/CN206908279U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108988293A (en) * | 2018-07-27 | 2018-12-11 | 南昌黑鲨科技有限公司 | Thermal-shutdown circuit and data line with it |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191203 Address after: Room 102, first floor, East Building, biotechnology building, Guangzhou agricultural science and technology development and research base, No. 13, Zhongsan Road, Zhongcun street, Panyu District, Guangzhou, Guangdong 511495 Patentee after: Guangzhou bond Detection Technology Co., Ltd. Address before: 14a, Nanyuan Fengye building, No. 1008, Nanshan Avenue, Nanshan District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Heiniu Detection Technology Co. Ltd. |
|
| TR01 | Transfer of patent right |