CN111307318A - Battery temperature sensor and battery temperature acquisition device - Google Patents
Battery temperature sensor and battery temperature acquisition device Download PDFInfo
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- CN111307318A CN111307318A CN202010181887.4A CN202010181887A CN111307318A CN 111307318 A CN111307318 A CN 111307318A CN 202010181887 A CN202010181887 A CN 202010181887A CN 111307318 A CN111307318 A CN 111307318A
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- battery
- resistor
- battery temperature
- temperature sensor
- thermistor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
Abstract
The invention relates to a battery temperature sensor and a battery temperature acquisition device, wherein the battery temperature sensor is arranged in a battery; the battery temperature sensor comprises a first resistor, a second resistor and a thermistor; one end of the first resistor is connected with a power supply, and the other end of the first resistor is respectively connected with one end of the second resistor and one end of the thermistor; the other end of the second resistor is connected with the other end of the thermistor; and obtaining the current temperature value of the thermistor according to the voltage values at the two ends of the second resistor. The temperature acquisition point is moved from the surface of the battery to the interior of the battery, so that the temperature in the battery can be acquired in real time, and the accuracy of battery temperature data acquisition is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery temperature sensor and a battery temperature acquisition device.
Background
In the thermal runaway occurrence process of the lithium ion battery, the electric core is used as a heating source, and heat is generated in the electric core and is diffused outwards. The highest temperature inside the battery is detected as the most effective thermal runaway criterion. Because under the normal condition, the thickness of the battery core is thicker, the surface area of the battery shell is larger, the heat dissipation effect is better, the temperature of the battery surface is mostly measured by battery temperature collection, and the temperature of the battery surface can not reflect the internal temperature of the battery in real time. The internal temperature of the battery is calculated according to the surface temperature, the error of the estimation method is large, the temperature rise of the battery cannot be predicted, and meanwhile, the calculation amount of a processor is required to be large, so that the monitoring and the management of the temperature of the power battery are not facilitated. The battery temperature is estimated by detecting the surface temperature through an algorithm, so that the calculated amount is large, the error is large, and the timeliness is poor.
Disclosure of Invention
Accordingly, an object of the present invention is to provide a battery temperature sensor and a battery temperature acquisition device, which can acquire the temperature inside a battery in real time.
In order to achieve the purpose, the invention provides the following scheme:
a battery temperature sensor disposed inside the battery; the battery temperature sensor comprises a first resistor, a second resistor and a thermistor;
one end of the first resistor is connected with a power supply, and the other end of the first resistor is respectively connected with one end of the second resistor and one end of the thermistor; the other end of the second resistor is connected with the other end of the thermistor; and obtaining the current temperature value of the thermistor according to the voltage values at the two ends of the second resistor.
Optionally, the thermistor is a negative temperature coefficient thermistor.
Optionally, the voltage value across the second resistor is
Wherein, U0Denotes a power supply, R0Denotes a first resistance, R1Denotes a second resistance, RNTCIndicating thermistor, UR1Representing the value of the voltage across the second resistor.
Optionally, the resistance of the first resistor is 1k Ω, and the resistance of the second resistor is 10k Ω.
A battery temperature collection device, the battery temperature collection device comprising: a battery and said battery temperature sensor; the battery temperature sensor is arranged at the hollow part of the inner core of the battery, and the internal temperature value of the battery is obtained by collecting the current temperature value of the battery temperature sensor.
Optionally, the battery temperature collecting device further includes: a diaphragm in which the battery temperature sensor is wrapped.
Optionally, the battery temperature acquisition device further comprises a single chip microcomputer and a cooling system, the single chip microcomputer is connected with the cooling system, the single chip microcomputer is used for acquiring voltage values at two ends of the second resistor, and the single chip microcomputer is further used for controlling the cooling system to be switched on and off according to the acquired voltage values at two ends of the second resistor.
Optionally, the battery temperature acquisition device further comprises an alarm device, the single chip microcomputer is connected with the alarm device, and the single chip microcomputer controls the alarm device to be turned on and off according to the voltage values at the two ends of the second resistor.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a battery temperature sensor and a battery temperature acquisition device, wherein the battery temperature sensor is arranged in a battery; the battery temperature sensor comprises a first resistor, a second resistor and a thermistor; one end of the first resistor is connected with a power supply, and the other end of the first resistor is respectively connected with one end of the second resistor and one end of the thermistor; the other end of the second resistor is connected with the other end of the thermistor; and obtaining the current temperature value of the thermistor according to the voltage values at the two ends of the second resistor. The temperature acquisition point is moved from the surface of the battery to the interior of the battery, so that the temperature in the battery can be acquired in real time, and the accuracy of battery temperature data acquisition is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a battery temperature sensor according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a relationship between a resistance and a temperature of a thermistor according to an embodiment of the present invention;
FIG. 3 is a graph showing the relationship between the voltage across the second resistor and the temperature according to the embodiment of the present invention;
fig. 4 is a schematic diagram of an apparatus for installing a battery temperature sensor in a pouch battery according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an apparatus for mounting a battery temperature sensor in a cylindrical battery according to an embodiment of the present invention;
description of the symbols: 101. a first resistor 102, a second resistor 103, a thermistor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a battery temperature sensor and a battery temperature acquisition device, which can acquire the temperature in a battery in real time.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of a battery temperature sensor according to an embodiment of the present invention, and as shown in fig. 1, the battery temperature sensor according to the present invention is disposed inside the battery; the battery temperature sensor includes a first resistor 101, a second resistor 102, and a thermistor 103.
One end of the first resistor 101 is connected with a power supply, and the other end of the first resistor 101 is respectively connected with one end of the second resistor 102 and one end of the thermistor 103; the other end of the second resistor 102 is connected with the other end of the thermistor 103; and obtaining the current temperature value of the thermistor 103 according to the voltage value at the two ends of the second resistor 102.
In an alternative embodiment, the thermistor 103 of the present invention is a negative temperature coefficient thermistor.
The voltage value at the two ends of the second resistor 102 is
Wherein, U0Denotes a power supply, R0Represents a first resistance 101, R1Represents a second resistance 102, RNTCRepresents a thermistor 103, UR1Representing the value of the voltage across the second resistor.
Specifically, the battery temperature sensor of the present invention collects the temperature using an NTC type (negative temperature coefficient) thermistor, and the resistance of the thermistor 103 decreases as the temperature increases. The battery temperature sensor is composed of an NTC type (negative temperature coefficient) thermistor 103RNTCAnd a second resistor 102R1Connected in parallel and then connected with the first resistor 101R0Is formed by connecting in series, the voltage between the lines is 5V, one end of the thermistor 103 is grounded, and the first resistor R0One end is connected with a 5V power supply. By monitoring the voltage division U of the thermistor 103 according to the principle of series voltage divisionR1(parallel voltage division, second resistor 102R)1Equal to the magnitude of the thermistor 103 voltage) to obtain the current temperature value of the thermistor 103. The first resistor 101, the second resistor 102 and the thermistor 103 are integrated into a battery temperature sensor probe using resistive patches and are subjected to an insulating sealing process.
As an alternative embodiment, the resistance of the first resistor 101 is 1k Ω, and the resistance of the second resistor 102 is 10k Ω.
The invention also provides a battery temperature acquisition device, which comprises: a battery and the battery temperature sensor; the battery temperature sensor is arranged at the hollow part of the inner core of the battery, and the internal temperature value of the battery is obtained by collecting the current temperature value of the battery temperature sensor.
As an optional implementation manner, the battery temperature collecting apparatus of the present invention further includes: a diaphragm in which the battery temperature sensor is wrapped.
As an optional implementation manner, the battery temperature acquisition device further includes a single chip microcomputer and a cooling system, the single chip microcomputer is connected to the cooling system, the single chip microcomputer is used for acquiring voltage values at two ends of the second resistor 102, and the single chip microcomputer is further used for controlling the cooling system to be turned on and off according to the acquired voltage values at two ends of the second resistor 102.
As an optional implementation manner, the battery temperature acquisition device further includes an alarm device, the single chip microcomputer is connected to the alarm device, and the single chip microcomputer controls the alarm device to be turned on or off according to the voltage value at the two ends of the second resistor 102.
Specifically, the working range of the battery is approximately between-20 ℃ and 40 ℃ in the normal use process of the battery, and the internal normal temperature of the battery is approximately between 0 ℃ and 60 ℃. Research shows that when the internal temperature of the lithium ion battery is higher than 80 ℃, the battery starts to be abused by heat, so that the measurement range of the battery temperature sensor is fixed between-20 ℃ and 100 ℃.
The resistance of the thermistor 103 is 1k omega at 25 ℃, 6.6k omega at-20 ℃ and 0.105k omega at 100 ℃ as a result of table lookup. The change curve of the resistance of the NTC thermistor 103 with temperature is shown in fig. 2. To monitor the voltage UR1The linearity between the first resistor 101 and the temperature is better, the resistance value of the first resistor 101 is 1k omega, the resistance value of the second resistor 102 is 10k omega, and the first resistor and the second resistor are substituted into an expression
To obtain
UR1The curve of the value of (D) along with the change of the temperature is shown in FIG. 3, the curve is approximately linear, the linearity of the curve is better in the temperature range of-20 ℃ to 70 ℃, and the voltage U at the two ends of the thermistor 103R1With increasing temperatureGradually decreases. After 70 ℃, the slope of the curve becomes larger gradually, and the voltage drops slowly. At 25 ℃, UR1The size is 2.38V; at-20 ℃ UR1The value of (A) is at most 4V; at 70 ℃, UR1Size 0.92V; at 100 ℃, UR1Has a minimum value of 0.47V. Since the internal temperature of the battery is generally not higher than 60 ℃ at the normal operating temperature of the battery, and the battery is at risk of thermal runaway when the internal temperature exceeds 80 ℃. The early warning value of the monitoring voltage can be set to 0.8V if UR1And if the voltage is less than 0.8V, the single chip microcomputer controls the alarm device to be started to give out an alarm to inform drivers to get off in time, so that casualties caused by safety accidents are avoided. In addition, an early warning voltage can be set, if the temperature of the sensor is 50 ℃, the voltage can be lower than 1.5V, and the single chip microcomputer starts an active cooling system in the module after detecting the voltage drop, so that the temperature of the battery is reduced and kept at the normal working temperature.
By way of example
The electric core is mostly made in a winding mode, and the middle of the inner core is hollow. Due to the action of heat conduction, heat is accumulated at the hollow part of the inner core, and the temperature at the hollow part of the inner core of the battery can better reflect the real-time temperature inside the lithium ion battery. The battery temperature sensor is directly arranged at the center of the lithium ion battery to obtain the center temperature of the battery so as to early warn the thermal runaway of the lithium battery.
As shown in figure 4, in the soft package battery, the battery temperature sensor penetrates into the battery pack from the hole between two electrodes of the battery, the battery temperature sensor is positioned in the gap of the battery center winding core and wrapped in the diaphragm, and the insulation property and the accuracy of temperature collection are guaranteed.
As shown in fig. 5, in a cylindrical battery, for example, a 18650 battery is drilled at the center of a circle of a negative electrode of the battery, a battery temperature sensor is inserted into a steel core gap of the battery, a steel core and a diaphragm are arranged between a circuit of the battery temperature sensor and an electric core for isolation, and insulation performance of the battery temperature sensor is ensured while heat is rapidly transferred.
The gaps are sealed by glass cement at the holes of the soft package battery and the positive and negative ends of the steel core of the cylindrical battery, so that the sealing and waterproof performance of the battery is ensured, and volatilization of electrolyte and oxygen are prevented.
The battery with the battery temperature sensor arranged inside the battery is called as a thermal sensing battery, so that the internal temperature information of the battery can be output while the normal voltage and current input and output of the battery are ensured under the condition of not changing the size of the battery, and the thermal management of the battery has good practical value.
The invention moves the temperature acquisition point from the surface of the battery to the interior of the battery, provides the single battery capable of outputting the central temperature of the battery in real time, improves the accuracy of battery temperature data acquisition, reduces the calculation pressure of a processing system caused by estimating the temperature of the battery, and improves the efficiency of temperature data processing.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A battery temperature sensor, wherein said battery temperature sensor is disposed inside said battery; the battery temperature sensor comprises a first resistor, a second resistor and a thermistor;
one end of the first resistor is connected with a power supply, and the other end of the first resistor is respectively connected with one end of the second resistor and one end of the thermistor; the other end of the second resistor is connected with the other end of the thermistor; and obtaining the current temperature value of the thermistor according to the voltage values at the two ends of the second resistor.
2. The battery temperature sensor of claim 1, wherein the thermistor is a negative temperature coefficient thermistor.
3. The battery temperature sensor of claim 1, wherein the voltage across the second resistor has a value of
Wherein, U0Denotes a power supply, R0Denotes a first resistance, R1Denotes a second resistance, RNTCIndicating thermistor, UR1Representing the value of the voltage across the second resistor.
4. The battery temperature sensor according to claim 1, wherein the first resistor has a resistance of 1k Ω, and the second resistor has a resistance of 10k Ω.
5. A battery temperature collection device, characterized in that, battery temperature collection device includes: a battery and a battery temperature sensor according to any one of claims 1 to 4; the battery temperature sensor is arranged at the hollow part of the inner core of the battery, and the internal temperature value of the battery is obtained by collecting the current temperature value of the battery temperature sensor.
6. The battery temperature acquisition device of claim 5, further comprising: a diaphragm in which the battery temperature sensor is wrapped.
7. The battery temperature acquisition device of claim 5, further comprising a single chip microcomputer and a cooling system, wherein the single chip microcomputer is connected with the cooling system, the single chip microcomputer is used for acquiring voltage values at two ends of the second resistor, and the single chip microcomputer is further used for controlling the cooling system to be switched on and off according to the acquired voltage values at two ends of the second resistor.
8. The battery temperature acquisition device of claim 7, further comprising an alarm device, wherein the single chip microcomputer is connected with the alarm device, and the single chip microcomputer controls the on-off of the alarm device according to the voltage value at the two ends of the second resistor.
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| CN202010181887.4A CN111307318A (en) | 2020-03-16 | 2020-03-16 | Battery temperature sensor and battery temperature acquisition device |
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| CN202010181887.4A CN111307318A (en) | 2020-03-16 | 2020-03-16 | Battery temperature sensor and battery temperature acquisition device |
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| CN203352203U (en) * | 2013-04-16 | 2013-12-18 | 深圳宝嘉能源有限公司 | Mobile power supply capable of detecting battery temperature |
| CN204043815U (en) * | 2014-09-23 | 2014-12-24 | 黄小俊 | A kind of lithium battery Overtemperature alarm of solar street light |
| CN106840442A (en) * | 2015-12-04 | 2017-06-13 | 北京展讯高科通信技术有限公司 | A kind of battery temperature measuring system and method |
| CN209043481U (en) * | 2018-11-05 | 2019-06-28 | 奥动新能源汽车科技有限公司 | The detection system of the temperature of the pole of the connector of power battery |
| CN110515006A (en) * | 2019-10-09 | 2019-11-29 | 山东元齐新动力科技有限公司 | A kind of battery pack, the management method of battery pack and vehicle |
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2020
- 2020-03-16 CN CN202010181887.4A patent/CN111307318A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201303364Y (en) * | 2008-04-22 | 2009-09-02 | 中兴通讯股份有限公司 | Temperature monitoring module of mobile terminal battery and high-temperature monitoring circuit of mobile terminal battery |
| CN203352203U (en) * | 2013-04-16 | 2013-12-18 | 深圳宝嘉能源有限公司 | Mobile power supply capable of detecting battery temperature |
| CN204043815U (en) * | 2014-09-23 | 2014-12-24 | 黄小俊 | A kind of lithium battery Overtemperature alarm of solar street light |
| CN106840442A (en) * | 2015-12-04 | 2017-06-13 | 北京展讯高科通信技术有限公司 | A kind of battery temperature measuring system and method |
| CN209043481U (en) * | 2018-11-05 | 2019-06-28 | 奥动新能源汽车科技有限公司 | The detection system of the temperature of the pole of the connector of power battery |
| CN110515006A (en) * | 2019-10-09 | 2019-11-29 | 山东元齐新动力科技有限公司 | A kind of battery pack, the management method of battery pack and vehicle |
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Application publication date: 20200619 |
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