CN109910616A - A kind of heating protection circuit of power system of electric automobile - Google Patents
A kind of heating protection circuit of power system of electric automobile Download PDFInfo
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- CN109910616A CN109910616A CN201910217967.8A CN201910217967A CN109910616A CN 109910616 A CN109910616 A CN 109910616A CN 201910217967 A CN201910217967 A CN 201910217967A CN 109910616 A CN109910616 A CN 109910616A
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- heating
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Abstract
The invention discloses a kind of heating protection circuits of power system of electric automobile; control unit MCU including battery management system; it is characterized by comprising enabled circuit, switch module, power batteries to connect through switch module with one end of heating relay, the other end ground connection of the heating relay；Described control unit MCU output end is connect with the input terminal of enabled circuit, another input terminal of the enabled circuit inputs battery temperature, the output end of the enabled circuit is connect with switch module, and the enabled circuit is used to be disconnected according to output signal and battery temperature signal control switch the module closure of control unit MCU.The present invention has the advantages that can effectively improve the pre- thermal safety of battery and accuracy by hardware circuit design, avoiding the occurrence of thermal runaway phenomenon.The security performance of battery pack is improved, and program structure is simple, logic is simple.
Description
Technical field
The present invention relates to electric car field of safety protection, in particular to a kind of heated protective of power system of electric automobile
Circuit.
Background technique
For Development of EV under the strategic support of State-level, explosive growth, but state is presented in the quantity of electric car
The irregular and exploitation proving period of interior Automobile Design is too short, leads to many designs and quality problems outstanding, especially exists
Electric safe design field, common electric vehicle include power battery thermal runaway, vehicle insulation, high-voltage electricity protection etc. safely.Electricity
Pond thermal runaway refers to that in existing battery management system, battery management system MCU is in the case where dynamical system is in low temperature condition, meeting
Battery is preheated, it is generally the case that after battery temperature reaches certain temperature, battery management system automatically shuts down heating system
System, but under certain failure conditions (for example software control is abnormal, heating element aging etc.), heating system is not according to setting
Situation turns off heating system, and then causes electrokinetic cell system thermal runaway.Damage of the thermal runaway for battery pack is especially serious, answers
When the generation for avoiding such case.In this context, the present invention will provide a kind of safety about electrokinetic cell system thermal runaway
Protection scheme.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of heated protectives of power system of electric automobile
Circuit can be improved pre- thermal safety and the appearance of thermal runaway be reduced or avoided.
To achieve the goals above, a kind of the technical solution adopted by the present invention are as follows: heating guarantor of power system of electric automobile
Protection circuit, the control unit MCU including battery management system, including enabled circuit, switch module, battery through switch module with
Heat one end connection of relay, the other end ground connection of the heating relay；Described control unit MCU output end and enabled electricity
The input terminal on road connects, another input terminal of the enabled circuit inputs battery temperature, the output end of the enabled circuit with
Switch module connection, the enabled circuit are used for output signal and battery temperature signal control switch according to control unit MCU
Module closure disconnects.
The enabled circuit includes AND gate circuit, comparator, and the output end of the AND gate circuit is connect with switch module, institute
The input terminal for stating AND gate circuit is separately connected the output end of comparator and the output end of control unit MCU, the comparator it is defeated
Enter end and inputs alarm temperature threshold value and battery temperature numerical value respectively.
The battery temperature data is acquired using temperature sensor, and the temperature sensor is patch type sensor, setting
On power battery.
The temperature sensor is arranged on power battery by heat-conducting glue.
The switch module is metal-oxide-semiconductor, and the grid of the metal-oxide-semiconductor is connect with AND gate circuit output end, source electrode and power
Battery connection, drain electrode are connect with heating relay.
The comparator is big in real time temperature data in the temperature data acquired more in real time and the temperature threshold of setting
When given threshold, comparator exports low level signal.
The AND gate circuit is when battery temperature is greater than temperature threshold, the grid of output low level to metal-oxide-semiconductor, and metal-oxide-semiconductor is disconnected
Open relay current supply circuit.
The present invention has the advantages that the pre- thermal safety of battery and accuracy can effectively improve by hardware circuit design,
Avoid the occurrence of thermal runaway phenomenon.The security performance of battery pack is improved, and program structure is simple, logic is simple, only existing
Increasing temperature sensor, comparator, AND gate circuit, metal-oxide-semiconductor on the basis of having battery pack to preheat can be realized, at low cost, implementable
Property is strong, and due to increased hardware circuit, is not related to software, reliability is preferable.
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 the principle of heating schematic diagram of battery system；
Fig. 2 is electrical block diagram 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.
As shown in Figure 1, in the prior art, power battery is connect by fuse, heating relay with heating element, add
Electrothermal relay receives the control signal closing or opening of the control unit MCU of battery management system, to pass through heating element pair
Battery is heated.This circuit is easy to appear the heating element as caused by MCU failure or other cause troubles and works always
Thermal runaway phenomenon caused by heating.The application provides a kind of thermal runaway that scheme is generated for reducing pre- heater circuit thus.
A kind of heating protection circuit of power system of electric automobile, the control unit MCU including battery management system, including
Enabled circuit, switch module, battery are connect through switch module with one end of heating relay, heat another termination of relay
Ground；Control unit MCU output end is connect with the input terminal of enabled circuit, another input terminal for enabling circuit inputs battery temperature
The output end of degree, enabled circuit is connect with switch module, enables circuit for the output signal and battery according to control unit MCU
Temperature signal carries out comprehensive analysis and carrys out the closure disconnection of control switch module.The temperature sensor of setting is that characterization battery pack temperature is
One characterization parameter of no normal need heating, and the output signal of control unit is also the parameter judged through excess temperature,
The unlatching closure for carrying out comprehensively control switch module, which effectively subtracts, to be judged to the battery status of the characterization of the two from excessively enabled circuit
Few thermal runaway.
As shown in Fig. 2, heating protection circuit includes AND gate circuit, comparator, switch module, the output end of AND gate circuit with
Switch module connection, the input terminal of AND gate circuit are separately connected the output end of comparator and the output end of control unit MCU, compare
The input terminal of device inputs alarm temperature threshold value and battery temperature numerical value respectively.Switch module is metal-oxide-semiconductor, the grid of metal-oxide-semiconductor with
Gate output connection, source electrode are connect with power battery, and drain electrode is connect with heating relay.The input terminal of comparator is defeated
Enter the temperature threshold of setting and the battery pack actual temperature value of temperature sensor acquisition.Temperature threshold is set according to actual battery situation
It sets.Battery temperature data is acquired using temperature sensor, and temperature sensor is patch type sensor, and temperature sensor passes through thermally conductive
Glue is arranged on power battery.
Its working principle includes: when actual temperature is greater than the temperature threshold of setting, and the output end of comparator exports low electricity
Pressure inputs low-voltage with gate logic input terminal, no matter and the control signal with 01 input terminal MCU of door at this time, with
Door output is low level signal, and metal-oxide-semiconductor cannot be switched at this time, that is, heating relay can not obtain electric closure, and then disconnected
Open relay contact, so that heating element power-off can not work.That is when comparator comparison result is greater than temperature threshold
When value, the power supply of heating element will be disconnected automatically at this time.If temperature is lower than threshold value, comparator exports high level, at this time only
Have when MCU output could also power for high level to heating element.Otherwise, it and can not power.Thus, passing through this electricity
Road setting, it is possible to reduce thermal runaway caused by MCU software goes wrong can also reduce thermal runaway caused by heating element, by
What it is in use is circuit element, better reliability.
Of the invention mainly designs a kind of electrical arrangement, specially increases thermal element in battery preheating heating system
Part monitors battery pack temperature, if heating device temperature is greater than the set value, warming collection value does ratio with circuit inside the control system
Compared with, forbid output heating relay, achieve the purpose that hardware turn off heating system；
The present invention: one, the temperature sensor of reliable in quality is chosen for precisely acquiring the temperature on power battery；Two, electric
The pond reasonable temperature of management system hardware setting compares threshold values for controlling, and three, battery management system hardware heating relay sets
Meter is exported comprising controlling with door wherein should be the control of the threshold values in technology two with signal source in door；
This programme can make electric automobile power battery system in the case where heating system is in abnormal conditions, by entire electrical
Circuit hardware design reaches shutdown heating circuit in time, prevents from then heating and cause thermal runaway risk.
Specific technical solution is as follows:
(1), a temperature sensor is increased on the basis of existing battery preheating system, for acquiring temperature of powered cell；
(2), by the setting to comparison circuit, triggering threshold values is determined；
(3), controlled using with door, comprehensive MCU processor information and comparator output, final output relay control signal；
(4), relay control signal driving heating relay disconnects, and heating element stops heating, reaches thermal runaway protection hair
Improving eyesight；
Comparator is greater than in real time temperature data and sets in the temperature data acquired more in real time and the temperature threshold of setting
When determining threshold value, comparator exports low level signal.
The present invention is system schema, specific to need to implement to complete according to following steps:
1. the sizeable temperature sensor of selected shape, main feature should be able to be easily installed in power battery surface,
Its major temperature detection interval should be able to include the temperature range of power battery, it is generally the case that and mount formats can be selected in this warming,
Warming is fixed on heater element surface with heat-conducting glue, temperature detection section is at least at -40-150 degrees Celsius；
2. increasing hardware design, circuit is increased into comparator, it is relevant to be controlled with gate logic control chip and relay
Driving chip in particular by the Standard resistance range of the humid test confirmation warming to heating element, and then converts the model of voltage
It encloses, by setting comparator voltage come the maximum temperature of regulating cell, when the temperature of actual acquisition is more than the temperature of setting
The upper limit, comparator output result should be low level signal, are similarly low level with gate coremaking piece output result at this time, drive
Metal-oxide-semiconductor chip disconnects；
3. battery pipeline system will drive relay signal shutdown, relay by the harness connected inside battery system
Shutdown movement is completed, final heating element stops heating；
By the implementation of above step, the design of the electrical arrangement of entire thermal runaway protection is completed, dynamical system peace is improved
Quan Xing.
Scheme summary increases warming in heating element, optimizes battery pipeline by the battery system electrical design of refinement
System circuit design, to reach the protection scheme in a kind of potential battery system heating process thermal runaway, the program has
The great application value of the advantages that logic is simple, at low cost, and exploitativeness is strong；
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 (7)
1. a kind of heating protection circuit of power system of electric automobile, the control unit MCU including battery management system, feature
Be: including enable circuit, switch module, battery through switch module with heating relay one end connect, it is described heat after
The other end of electric appliance is grounded；Described control unit MCU output end is connect with the input terminal of enabled circuit, the enabled circuit it is another
One input terminal inputs battery temperature, and the output end of the enabled circuit is connect with switch module, and the enabled circuit is used for root
It is disconnected according to output signal and battery temperature signal control switch the module closure of control unit MCU.
2. a kind of heating protection circuit of power system of electric automobile as described in claim 1, it is characterised in that: described enabled
Circuit includes AND gate circuit, comparator, and the output end of the AND gate circuit is connect with switch module, the input of the AND gate circuit
End is separately connected the output end of comparator and the output end of control unit MCU, and the input terminal of the comparator inputs alarm respectively
Temperature threshold and battery temperature numerical value.
3. a kind of heating protection circuit of power system of electric automobile as claimed in claim 1 or 2, it is characterised in that: described
Battery temperature data is acquired using temperature sensor, and the temperature sensor is patch type sensor, is arranged on power battery.
4. a kind of heating protection circuit of power system of electric automobile as claimed in claim 3, it is characterised in that: the temperature
Sensor is arranged on power battery by heat-conducting glue.
5. a kind of heating protection circuit of power system of electric automobile as claimed in claim 1 or 2, it is characterised in that: described
Switch module is metal-oxide-semiconductor, and the grid of the metal-oxide-semiconductor is connect with AND gate circuit output end, and source electrode is connect with battery, drain electrode
It is connect with heating relay.
6. a kind of heating protection circuit of power system of electric automobile as claimed in claim 1 or 2, it is characterised in that: described
Comparator is greater than given threshold in the temperature data acquired more in real time and the temperature threshold of setting, in real time temperature data
When, comparator exports low level signal.
7. a kind of heating protection circuit of power system of electric automobile as claimed in claim 1 or 2, it is characterised in that: described
AND gate circuit is when battery temperature is greater than temperature threshold, the grid of output low level to metal-oxide-semiconductor, and metal-oxide-semiconductor disconnects relay power supply
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910217967.8A CN109910616A (en) | 2019-03-21 | 2019-03-21 | A kind of heating protection circuit of power system of electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910217967.8A CN109910616A (en) | 2019-03-21 | 2019-03-21 | A kind of heating protection circuit of power system of electric automobile |
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| CN109910616A true CN109910616A (en) | 2019-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910217967.8A Pending CN109910616A (en) | 2019-03-21 | 2019-03-21 | A kind of heating protection circuit of power system of electric automobile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421034A (en) * | 2022-01-21 | 2022-04-29 | 广东志成冠军集团有限公司 | Universal microelectronic switch for lithium battery module and use method thereof |
| CN116112002A (en) * | 2023-04-12 | 2023-05-12 | 长鑫存储技术有限公司 | Comparison circuit |
| DE102023002638A1 (en) | 2022-07-08 | 2024-01-11 | Mercedes-Benz Group AG | System and method for managing thermal runaway in a battery |
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| CN203225539U (en) * | 2013-03-21 | 2013-10-02 | 盐城师范学院 | An anti-thermal-runaway charging apparatus |
| CN106025440A (en) * | 2016-05-26 | 2016-10-12 | 维沃移动通信有限公司 | Heating control circuit, control method and mobile terminal |
| CN207217700U (en) * | 2017-08-11 | 2018-04-10 | 广州极飞科技有限公司 | A kind of battery heater circuit, battery heating device and unmanned plane |
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2019
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH07322401A (en) * | 1994-05-19 | 1995-12-08 | Fuji Heavy Ind Ltd | Motor output limiter for electric car |
| US20050046278A1 (en) * | 2003-08-26 | 2005-03-03 | Long Jerral A. | Over-dwell protection circuit for an automotive ignition control system |
| CN101103509A (en) * | 2005-04-20 | 2008-01-09 | 松下电器产业株式会社 | Secondary battery protection circuit, battery pack and thermosensitive protection switch device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421034A (en) * | 2022-01-21 | 2022-04-29 | 广东志成冠军集团有限公司 | Universal microelectronic switch for lithium battery module and use method thereof |
| CN114421034B (en) * | 2022-01-21 | 2024-03-01 | 广东志成冠军集团有限公司 | Universal microelectronic switch for lithium battery module and application method thereof |
| DE102023002638A1 (en) | 2022-07-08 | 2024-01-11 | Mercedes-Benz Group AG | System and method for managing thermal runaway in a battery |
| CN116112002A (en) * | 2023-04-12 | 2023-05-12 | 长鑫存储技术有限公司 | Comparison circuit |
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| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 241000 No. 226 Jin Hua Nan Road, Yijiang hi tech Industrial Development Zone, Anhui, Wuhu Applicant after: Chery New Energy Automobile Co.,Ltd. Address before: 241000 No. 226 Jin Hua Nan Road, Yijiang hi tech Industrial Development Zone, Anhui, Wuhu Applicant before: CHERY NEW ENERGY AUTOMOBILE TECHNOLOGY Co.,Ltd. |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190621 |
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| RJ01 | Rejection of invention patent application after publication |