CN116878683A - Method for detecting internal temperature of battery and battery temperature detection circuit - Google Patents

Method for detecting internal temperature of battery and battery temperature detection circuit Download PDF

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Publication number
CN116878683A
CN116878683A CN202311000982.XA CN202311000982A CN116878683A CN 116878683 A CN116878683 A CN 116878683A CN 202311000982 A CN202311000982 A CN 202311000982A CN 116878683 A CN116878683 A CN 116878683A
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China
Prior art keywords
battery
temperature
detection
output
discharge
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CN202311000982.XA
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Chinese (zh)
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请求不公布姓名
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Tuoer Microelectronics Co ltd
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Tuoer Microelectronics Co ltd
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Priority to CN202311000982.XA priority Critical patent/CN116878683A/en
Publication of CN116878683A publication Critical patent/CN116878683A/en
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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
    • 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
    • G01K7/24—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 in a specially-adapted circuit, e.g. bridge circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery

Abstract

The application provides a method for detecting the internal temperature of a battery and a battery temperature detection circuit, which are used for acquiring the voltage values of two ends of a detection resistor in the battery temperature detection circuit, the internal resistance value of the battery and the heat resistance value of the battery for heat dissipation of the detection resistor in the battery temperature detection circuit; determining a current value of a current flowing in the battery temperature detection circuit based on the resistance value and the voltage value of the detection resistor; determining the battery heating power of the battery during power supply by using the internal resistance value and the current value of the battery; based on the battery heating power and the thermal resistance value, the internal temperature of the battery is determined in combination with the chip temperature detected by the battery protection circuit in the battery temperature detection circuit. Therefore, the internal temperature of the battery can be accurately detected on the premise that a temperature-sensitive resistor is not required to be additionally arranged, so that the accuracy of a battery temperature detection result is improved, and meanwhile, the detection cost can be reduced.

Description

Method for detecting internal temperature of battery and battery temperature detection circuit
Technical Field
The application relates to the technical field of battery detection, in particular to a method for detecting the internal temperature of a battery and a battery temperature detection circuit.
Background
In the use process of the battery, the temperature of the battery is detected to further ensure the safety of the battery. When the internal temperature of the battery is excessively high, it is necessary to prohibit the charge and discharge of the battery. If the temperature of the battery surface detected by the temperature sensitive resistor cannot accurately reflect the temperature inside the battery, potential safety hazards can be caused.
At present, a temperature-sensitive resistor is generally adopted to detect the temperature of the battery, however, the temperature-sensitive resistor is additionally arranged in the mode, and the detection of the temperature of the battery is realized by adding a corresponding pin; obviously, the mode of adding the temperature-sensitive resistor and the pins can certainly increase the measurement cost of the battery temperature; in addition, the temperature of the battery surface can be detected only by the temperature sensitive resistor, and in fact, the temperature inside the battery can be different from the temperature of the battery surface, particularly when the battery works with high current, the battery can generate heat, so that the temperature inside the battery is higher than the temperature of the battery surface; therefore, the internal temperature of the battery cannot be accurately detected using the temperature sensitive resistor.
Disclosure of Invention
Accordingly, the present application is directed to a method and a circuit for detecting the internal temperature of a battery, which can accurately detect the internal temperature of the battery without providing an additional temperature-sensitive resistor, so as to improve the accuracy of the battery temperature detection result and reduce the detection cost.
The embodiment of the application provides a method for detecting the internal temperature of a battery, which is applied to a battery temperature detection circuit; the detection method comprises the following steps:
acquiring voltage values at two ends of a detection resistor in the battery temperature detection circuit, a battery internal resistance value of a battery and a thermal resistance value of the battery for radiating heat to the detection resistor in the battery temperature detection circuit;
determining a current value of a current flowing in the battery temperature detection circuit based on a resistance value of the detection resistor and the voltage value;
determining battery heating power of the battery during power supply by utilizing the battery internal resistance value and the current value;
and based on the battery heating power and the thermal resistance value, determining the internal temperature of the battery by combining the chip temperature detected by the battery protection circuit in the battery temperature detection circuit.
In one possible implementation manner, the acquiring the voltage value across the detection resistor in the battery temperature detection circuit includes:
detecting a first output voltage of an IS terminal and a second output voltage of a GND terminal of the battery protection circuit respectively;
and determining the output voltage difference between the first output voltage and the second output voltage as the voltage value of the detection resistor.
In one possible embodiment, the detection method further includes:
and according to the comparison relation between the internal temperature of the battery and the temperature threshold value, determining the working state of the battery by controlling the level signal output by the CO end or the DO end of the battery protection circuit.
In one possible embodiment, the temperature threshold includes a charge over-temperature threshold, a discharge over-temperature threshold, a charge low-temperature threshold, and a discharge low-temperature threshold; the determining the working state of the battery by controlling the level signal output by the CO end or the DO end of the battery protection circuit according to the comparison relation between the internal temperature of the battery and the temperature threshold value comprises the following steps:
if the internal temperature is greater than the charging overtemperature threshold, controlling the CO end to output a low-level signal so as to enable the battery to be in a high-temperature charge inhibition state; or alternatively, the first and second heat exchangers may be,
if the internal temperature is greater than the discharge over-temperature threshold, controlling the DO end to output a low-level signal so as to enable the battery to be in a high-temperature discharge inhibition state; or alternatively, the first and second heat exchangers may be,
if the internal temperature is greater than the charging low-temperature threshold, controlling the CO end to output a low-level signal so as to enable the battery to be in a low-temperature charge inhibition state; or alternatively, the first and second heat exchangers may be,
and if the internal temperature is greater than the discharge low-temperature threshold, controlling the DO end to output a low-level signal so as to enable the battery to be in a low-temperature discharge forbidden state.
The embodiment of the application also provides a battery temperature detection circuit, which comprises a battery protection circuit, a detection resistor, a battery, a discharge MOS tube and a charging MOS tube;
the first end of the battery protection circuit is connected with the input positive electrode of the battery temperature detection circuit; the IS end of the battery protection circuit IS connected with the first end of the detection resistor; the GND end of the battery protection circuit is connected with the second end of the detection resistor; the DO end of the battery protection circuit is connected with the grid electrode of the discharge MOS tube; the CO end of the battery protection circuit is connected with the grid electrode of the charging MOS tube; the second end of the battery protection circuit is connected with the input cathode of the battery temperature detection circuit;
the battery anode of the battery is connected with the input anode; the battery cathode of the battery is connected with the ground terminal;
the second end of the detection resistor is also connected between the battery cathode and the ground end;
the source electrode of the discharge MOS tube is connected with the input cathode; the drain electrode of the discharging MOS tube is connected with the source electrode of the charging MOS tube; the drain electrode of the charging MOS tube is connected between the first end of the detection resistor and the CO end.
In one possible embodiment, the battery protection circuit includes a power calculation module, a temperature calculation module, a charge/discharge control module, a first driver, and a second driver;
the current input end of the power calculation module IS used as the IS end; the power output end of the power calculation module is connected with the power input end of the temperature calculation module;
the temperature output end of the temperature calculation module is connected with the first input end of the charge/discharge control module; the first output end of the charge/discharge control module is connected with the control signal input end of the first driver; the second output end of the charge/discharge control module is connected with the control signal input end of the second driver;
a first output end of the first driver is used as the CO end; a second output end of the first driver is used as the input negative electrode;
a first output end of the second driver is used as the DO end; the second output terminal of the second driver serves as the GND terminal.
In one possible implementation, the battery protection circuit further includes a voltage detection module, a discharge overcurrent detection module, and a short circuit detection module;
the input ends of the voltage detection module, the discharge overcurrent detection module and the short circuit detection module are connected with the input anode;
the output end of the voltage detection module is connected with the second input end of the charge/discharge control module; the output end of the discharge overcurrent detection module is connected with the third input end of the charge/discharge control module; the output end of the short circuit detection module is connected with the fourth input end of the charge/discharge control module.
In one possible implementation, the power calculation module includes a first analog-to-digital converter, a first multiplier, and a second multiplier;
the analog signal input end of the first analog-to-digital converter IS used as the current input end of the power calculation module and IS connected with the IS end; the digital signal output end of the first analog-to-digital converter is connected with the input end of the first multiplier; the output end of the first multiplier is connected with the input end of the second multiplier; the output end of the second multiplier is used as the power output end of the power calculation module.
In one possible implementation, the temperature calculation module includes a third multiplier, a first adder, a second analog-to-digital converter, and a temperature detection module;
the input end of the third multiplier is used as the power input end of the temperature calculation module; the output end of the third multiplier is connected with the first input end of the first adder; the output end of the first adder is used as the temperature output end of the temperature calculation module;
the analog signal input end of the second analog-to-digital converter is connected with the temperature voltage output end of the temperature detection module; the digital signal output end of the second analog-to-digital converter is connected with the second input end of the first adder;
the temperature detection module is used for detecting a thermal resistance value generated when the battery dissipates heat.
In one possible implementation, the temperature detection module includes a current source and a transistor;
the negative electrode of the current source is connected with the collector electrode of the transistor; the emitter of the transistor is grounded; and the base electrode of the transistor is used as a temperature voltage output end of the temperature detection module.
The embodiment of the application also provides electronic equipment, which comprises: the battery internal temperature detection device comprises a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, when the electronic device is running, the processor and the memory are communicated through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the battery internal temperature detection method.
The embodiment of the present application also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method for detecting the internal temperature of a battery as described above.
According to the method for detecting the internal temperature of the battery and the battery temperature detection circuit provided by the embodiment of the application, the voltage values of the two ends of the detection resistor in the battery temperature detection circuit, the internal resistance value of the battery and the thermal resistance value of the battery for detecting the heat dissipation of the resistor in the battery temperature detection circuit are obtained; determining a current value of a current flowing in the battery temperature detection circuit based on the resistance value and the voltage value of the detection resistor; determining the battery heating power of the battery during power supply by using the internal resistance value and the current value of the battery; based on the battery heating power and the thermal resistance value, the internal temperature of the battery is determined in combination with the chip temperature detected by the battery protection circuit in the battery temperature detection circuit. Therefore, the internal temperature of the battery can be accurately detected on the premise that a temperature-sensitive resistor is not required to be additionally arranged, so that the accuracy of a battery temperature detection result is improved, and meanwhile, the detection cost can be reduced.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for detecting an internal temperature of a battery according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a battery temperature detection circuit according to an embodiment of the present application;
FIG. 3 is one of the circuit schematic diagrams of the battery protection circuit of FIG. 2;
FIG. 4 is a schematic circuit diagram of the power calculation module shown in FIG. 3;
FIG. 5 is a schematic circuit diagram of the temperature calculation module shown in FIG. 3;
FIG. 6 is a schematic circuit diagram of the temperature detection module shown in FIG. 5;
FIG. 7 is a second schematic circuit diagram of the battery protection circuit of FIG. 2;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments of the present application, every other embodiment obtained by a person skilled in the art without making any inventive effort falls within the scope of protection of the present application.
According to research, at present, a temperature-sensitive resistor is generally adopted to detect the temperature of the battery, but the temperature-sensitive resistor is additionally arranged in the mode, and the detection of the temperature of the battery is realized by adding corresponding pins; obviously, the mode of adding the temperature-sensitive resistor and the pins can certainly increase the measurement cost of the battery temperature; in addition, the temperature of the battery surface can be detected only by the temperature sensitive resistor, and in fact, the temperature inside the battery can be different from the temperature of the battery surface, particularly when the battery works with high current, the battery can generate heat, so that the temperature inside the battery is higher than the temperature of the battery surface; therefore, the internal temperature of the battery cannot be accurately detected using the temperature sensitive resistor.
Based on the above, the embodiment of the application provides a method for detecting the internal temperature of a battery, which can accurately detect the internal temperature of the battery on the premise of not additionally arranging a temperature-sensitive resistor, can improve the accuracy of a battery temperature detection result, and can reduce the detection cost of the battery temperature.
Referring to fig. 1, fig. 1 is a flowchart of a method for detecting an internal temperature of a battery according to an embodiment of the application. A battery temperature detection circuit; as shown in fig. 1, a method for detecting an internal temperature of a battery according to an embodiment of the present application includes:
s101, acquiring voltage values at two ends of a detection resistor in the battery temperature detection circuit, a battery internal resistance value of a battery and a thermal resistance value of the battery for detecting heat dissipation of the resistor in the battery temperature detection circuit.
S102, determining a current value of a current flowing in the battery temperature detection circuit based on the resistance value of the detection resistor and the voltage value.
And S103, determining the battery heating power of the battery during power supply by using the battery internal resistance value and the current value.
And S104, based on the battery heating power and the thermal resistance value, combining the chip temperature detected by the battery protection circuit in the battery temperature detection circuit to determine the internal temperature of the battery.
The method for detecting the internal temperature of the battery can be used for determining the internal temperature of the battery by combining the battery heating power and the thermal resistance value of the battery with the chip temperature detected by the battery protection circuit in the battery temperature detection circuit, so that the detection of the internal temperature of the battery is realized on the premise of not setting a temperature-sensitive resistor, the accuracy of a temperature detection result is improved, and the cost of detecting the temperature of the battery is reduced.
In step S101, the voltage values at two ends of the detection resistor in the battery temperature detection circuit, the internal resistance value of the battery, and the thermal resistance value of the heat dissipation of the detection resistor in the battery temperature detection circuit during the operation of the battery are respectively obtained.
Here, the voltage value across the detection resistor may be determined by detecting the voltage difference between the IS terminal and the GND terminal in the battery protection circuit.
In one embodiment, the acquiring the detection resistance R in the battery temperature detection circuit i Voltage value at both ends, comprising:
step 1, respectively detecting a first output voltage of an IS terminal and a second output voltage of a GND terminal of the battery protection circuit.
In this step, the IS terminal and GND terminal provided in the battery protection circuit are respectively connected to the detection resistor R i Therefore, the detection resistor R can be determined by determining the voltage difference between the IS terminal and the GND terminal i The voltage values at both ends; at this time, the first output voltage at the IS terminal side and the second output voltage at the GND terminal side of the battery protection circuit are detected, respectively.
Step 2, determining the output voltage difference between the first output voltage and the second output voltage as the detection resistor R i Is a voltage value of (a).
The internal resistance value of the battery can be set according to different battery types in different products; the thermal resistance value of the battery for detecting the heat dissipation of the resistor in the battery temperature detection circuit can be set according to the actual measured values of different product designs.
In step S102, based on the determined detection resistance R i The resistance value and the voltage value of the battery are combined with the correlation between the resistance value, the current value and the voltage value to determine the current value of the current flowing in the battery temperature detection circuit, namely the current value I of the battery bat 。
In step S103, the obtained internal resistance value R of the battery is used esr And the determined current value I of the battery bat Combining the battery heating power with the battery internal resistance value R esr And the current value I of the battery bat The association relation between the two is used for determining the battery heating power P generated when the battery is powered bat 。
Specifically, the battery heating power P generated when the battery is powered is determined by the following formula bat ：
P bat ＝(I bat ) 2 .R esr ；
Wherein P is bat Is the heating power of the battery, I bat Is the current value of the battery, R esr Is the internal resistance value of the battery.
In step S104, based on the determined battery heating power and thermal resistance value, in combination with the chip temperature detected by the battery protection circuit in the battery temperature detection circuit, the internal temperature of the battery is determined during the operation of the battery.
Specifically, the internal temperature of the battery is determined by the following formula:
T bat ＝T c +P bat .R th ；
wherein T is c Is the chip temperature, P, detected by the battery protection circuit bat Is the heating power of the battery, R th The battery is used for detecting the heat resistance value of heat dissipation of a resistor in a battery temperature detection circuit, and T is bat Is the internal temperature of the battery.
Here, after the internal temperature of the battery is clarified, the operating state of the battery may be controlled to avoid potential safety hazards existing in the circuit.
In one embodiment, the detection method further comprises:
s105, according to the comparison relation between the internal temperature of the battery and the temperature threshold value, the working state of the battery is determined by controlling the level signal output by the CO end or the DO end of the battery protection circuit.
In the step, the internal temperature of the battery can be compared with different temperature thresholds, and the working state of the battery can be controlled by controlling the CO end or the DO end of the battery protection circuit to output a low-level signal according to the comparison relation between the internal temperature of the battery and the temperature thresholds.
The working states of the battery comprise a high-temperature charge prohibition state, a high-temperature discharge prohibition state, a low-temperature charge prohibition state and a low-temperature discharge prohibition state; the temperature threshold includes a charge over-temperature threshold, a discharge over-temperature threshold, a charge low-temperature threshold, and a discharge low-temperature threshold.
Therefore, when the internal temperature of the battery is abnormal, the battery can be controlled to be in a working state in time, and the potential safety hazard problem of the circuit is avoided.
In one embodiment, step S105 includes:
and if the internal temperature is greater than the charging overtemperature threshold, controlling the CO end to output a low-level signal so as to enable the battery to be in a high-temperature charge inhibition state.
In the step, the internal temperature is compared with the charge overtemperature threshold, if the internal temperature is larger than the charge overtemperature threshold, the CO end of the battery protection circuit is controlled to output a low-level signal so that the battery is in a high-temperature charge inhibition state, and the function of high-temperature charge inhibition is realized.
Or if the internal temperature is greater than the discharge over-temperature threshold, controlling the DO end to output a low-level signal so as to enable the battery to be in a high-temperature discharge forbidden state.
In the step, the internal temperature is compared with the discharge over-temperature threshold, and if the internal temperature is larger than the discharge over-temperature threshold, the DO end of the battery protection circuit is controlled to output a low-level signal so that the battery is in a high-temperature discharge inhibition state, and the high-temperature discharge inhibition function is realized.
Or if the internal temperature is greater than the charging low-temperature threshold, controlling the CO end to output a low-level signal so as to enable the battery to be in a low-temperature charge inhibition state;
in the step, the internal temperature is compared with the charging low temperature threshold, and if the internal temperature is larger than the charging low temperature threshold, the CO end of the battery protection circuit is controlled to output a low-level signal so as to enable the battery to be in a low-temperature charge inhibition state, thereby realizing the function of low-temperature charge inhibition.
Or if the internal temperature is greater than the discharge low temperature threshold, controlling the DO end to output a low-level signal so as to enable the battery to be in a low-temperature discharge forbidden state.
In the step, the internal temperature is compared with a discharge low temperature threshold, and if the internal temperature is larger than the discharge low temperature threshold, the DO end of the battery protection circuit is controlled to output a low-level signal so that the battery is in a low-temperature discharge inhibition state, and the low-temperature discharge inhibition function is realized.
According to the method for detecting the internal temperature of the battery, provided by the embodiment of the application, the voltage values of the two ends of the detection resistor in the battery temperature detection circuit, the internal resistance value of the battery and the heat resistance value of the battery for radiating heat to the detection resistor in the battery temperature detection circuit are obtained; determining a current value of a current flowing in the battery temperature detection circuit based on the resistance value and the voltage value of the detection resistor; determining the battery heating power of the battery during power supply by using the internal resistance value and the current value of the battery; based on the battery heating power and the thermal resistance value, the internal temperature of the battery is determined in combination with the chip temperature detected by the battery protection circuit in the battery temperature detection circuit. Therefore, the internal temperature of the battery can be accurately detected on the premise that a temperature-sensitive resistor is not required to be additionally arranged, so that the accuracy of a battery temperature detection result is improved, and meanwhile, the detection cost can be reduced.
Referring to fig. 2, fig. 2 is a schematic circuit diagram of a battery temperature detection circuit according to an embodiment of the application. As shown in fig. 2, a battery temperature detection circuit 200 provided in an embodiment of the present application includes: battery protection circuit 210, detection resistor 220, battery 230, discharge MOS transistor 240, and charge MOS transistor 250.
A first end of the battery protection circuit 210 is connected with an input positive electrode of the battery temperature detection circuit 200; the IS terminal of the battery protection circuit 210 IS connected to the first terminal of the detection resistor 220; the GND terminal of the battery protection circuit 210 is connected to the second terminal of the detection resistor 220; the DO end of the battery protection circuit 210 is connected to the gate of the discharge MOS tube 240, and further, the DO end can be utilized to control the discharge MOS tube 240 to be turned on or off by outputting a low-level signal to the discharge MOS tube 240, so as to achieve the purpose of changing the battery working state;
the CO end of the battery protection circuit 210 is connected to the gate of the charging MOS tube 250, and further, the CO end can be used to control the charging MOS tube 250 to be turned on or off by outputting a low-level signal to the charging MOS tube 250, so as to achieve the purpose of changing the battery working state;
the high level output by the CO end is equal to the power supply voltage input by the input anode; i.e. the positive voltage of the power supply; the low level output by the CO end is equal to the power supply voltage input by the input cathode; namely, the negative voltage of the power supply; the high level output by the DO end is equal to the power supply voltage input by the input anode; i.e. the positive voltage of the power supply; the low level output from the DO terminal is equal to the voltage at the GND terminal.
A second end of the battery protection circuit 210 is connected to an input cathode of the battery temperature detection circuit 200;
the battery positive electrode of the battery 230 is connected with the input positive electrode; the negative electrode of the battery 230 is connected with the ground;
the second end of the detection resistor 220 is further connected between the battery negative electrode of the battery 230 and the ground terminal;
the source electrode of the discharge MOS tube 240 is connected with the input cathode; the drain electrode of the discharging MOS tube 240 is connected with the source electrode of the charging MOS tube 250; the drain of the charging MOS transistor 250 is connected between the first end of the detection resistor 220 and the CO end.
In one embodiment, referring to fig. 3, fig. 3 is a schematic circuit diagram of the battery protection circuit in fig. 2. As shown in fig. 3, the battery protection circuit 210 includes a power calculation module 211 (PowCal), a temperature calculation module 212 (TempCal), a charge/discharge control module 213 (CTRL), a first driver 214, and a second driver 215;
the first driver 214 and the second driver 215 are each composed of an even number of inverters;
a current input terminal of the power calculation module 211 (PowCal) IS the IS terminal; the power output end of the power calculation module 211 (PowCal) is connected with the power input end of the temperature calculation module 212 (TempCal);
a temperature output terminal of the temperature calculation module 212 (TempCal) is connected to a first input terminal of the charge/discharge control module 213 (CTRL); a first output terminal of the charge/discharge control module 313 (CTRL) is connected to a control signal input terminal of the first driver 214; a second output terminal of the charge/discharge control module 213 (CTRL) is connected to a control signal input terminal of the second driver 215;
a first output of the first driver 214 serves as the CO terminal; a second output of the first driver 214 acts as the input cathode; the first driver 214 is configured to compare the battery internal temperature of the battery 230 with a charge over-temperature threshold and a charge under-temperature threshold.
A first output terminal of the second driver 215 serves as the DO terminal; a second output terminal of the second driver 215 is the GND terminal; the second driver 215 is used to compare the battery internal temperature of the battery 230 with the discharge over-temperature threshold and the discharge under-temperature threshold.
The power calculation module 211 (PowCal) is configured to determine a battery heating power generated by the battery 230 at a speed of supplying power, based on a battery internal resistance value of the battery 230 and a current value of the battery 230.
The temperature calculating module 212 (TempCal) receives the battery heating power output by the power output end of the power calculating module 211 through the power input end, and is configured to determine the internal temperature of the battery 230 based on the determined received battery heating power and the thermal resistance value of the battery 230 for detecting the heat dissipation of the resistor in the battery temperature detecting circuit, and in combination with the chip temperature detected by the battery protecting circuit 210.
The charge/discharge control module 213 (CTRL) receives the internal temperature output from the temperature output end of the temperature calculation module 212 through the first input end, and determines the output level of the CO end connection or the DO end connection by comparing the internal temperature with a temperature threshold, so as to control the on or off of the discharge MOS tube 240 and the charge MOS tube 250 through the output level, thereby realizing the control of the operating state of the battery 230.
The voltage input terminal of the charge/discharge control module 213 is connected to the input positive electrode.
In one embodiment, referring to fig. 4, fig. 4 is a schematic circuit diagram of the power calculation module shown in fig. 3. As shown in fig. 4, the power calculation module 211 includes a first analog-to-digital converter 2111, a first multiplier 2112, and a second multiplier 2113;
the analog signal input end of the first analog-to-digital converter 2111 IS connected to the IS end as the current input end of the power calculation module 211; the digital signal output end of the first analog-to-digital converter 2111 is connected with the input end of the first multiplier 2112; the output end of the first multiplier 2112 is connected with the input end of the second multiplier 2113; the output of the second multiplier 2113 is used as the power output of the power calculation module 211.
The first analog-to-digital converter 2111 IS used for converting the voltage value of the IS terminal from an analog signal to a digital signal.
In one embodiment, referring to fig. 5, fig. 5 is a schematic circuit diagram of the temperature calculating module shown in fig. 3. As shown in fig. 5, the temperature calculation module 212 includes a third multiplier 2121, a first adder 2122, a second analog-to-digital converter 2123, and a temperature detection module 2124;
an input of the third multiplier 2121 serves as a power input of the temperature calculation module 212; an output of the third multiplier 2121 is connected to a first input of the first adder 2122; an output of the first adder 2122 serves as a temperature output of the temperature calculation module 212;
the analog signal input end of the second analog-to-digital converter 2123 is connected with the temperature voltage output end of the temperature detection module 2124; the digital signal output of the second analog-to-digital converter 2123 is connected to the second input of the first adder 2122.
The temperature detection module 2124 is configured to detect a thermal resistance value of the battery 230 radiating heat to the detection resistor 220 in the battery temperature detection circuit; the temperature detection module 2124 transmits the thermal resistance value to the second analog-to-digital converter 2123 through a temperature voltage output terminal.
The second analog-to-digital converter 2123 is configured to convert the thermal resistance value output by the temperature detection module 2124 from an analog signal to a digital signal.
In one embodiment, referring to fig. 6, fig. 6 is a schematic circuit diagram of the temperature detection module shown in fig. 5. As shown in fig. 6, the temperature detection module 2124 includes a current source 21241 and a transistor 21242;
the negative electrode of the current source 21241 is connected to the collector of the transistor 21242; the emitter of the transistor 21242 is grounded; the base of the transistor 21242 serves as a temperature voltage output of the temperature sensing module 2124.
Wherein transistor 21242 (Q 1 ) V of (2) be The (base-emitter voltage), i.e., the VST voltage is a negative temperature coefficient voltage, may be used to reflect the temperature change information, and further, may determine a thermal resistance value of the battery 230 for radiating heat to the detection resistor 220 in the battery temperature detection circuit 200 according to the VST voltage of the transistor 21242, and output the thermal resistance value to the second analog-to-digital converter 2123.
In a preferred implementation, current source 21241 (I b ) A zero temperature coefficient current source may be employed.
In one embodiment, referring to fig. 7, fig. 7 is a second schematic circuit diagram of the battery protection circuit in fig. 2; as shown in fig. 7, the battery protection circuit further includes a voltage detection module 216 (VDet), a discharge over-current detection module 217 (EDI), and a short circuit detection module 218 (SC);
the input ends of the voltage detection module 216, the discharge overcurrent detection module 217 and the short circuit detection module 218 are all connected with the input anode;
an output terminal of the voltage detection module 216 is connected to a second input terminal of the charge/discharge control module 213; the voltage detection module 216 is configured to detect a voltage value in the battery temperature detection circuit 200, and an input terminal of the voltage detection module 216 inputs the detected voltage value to the charge/discharge control module 213 through a second input terminal of the charge/discharge control module 213.
The output end of the discharge overcurrent detection module 217 is connected with the third input end of the charge/discharge control module 213; the discharge overcurrent detection module 217 detects the charge and discharge current of the battery 230 to avoid the problem of discharge overcurrent of the battery.
An output terminal of the short circuit detection module 218 is connected to a fourth input terminal of the charge/discharge control module 213; the short circuit detection module 218 is configured to avoid a short circuit problem in the battery temperature detection circuit 200.
The battery temperature detection circuit provided by the embodiment of the application comprises a battery protection circuit, a detection resistor, a battery, a discharge MOS tube and a charging MOS tube; the first end of the battery protection circuit is connected with the input positive electrode of the battery temperature detection circuit; the IS end of the battery protection circuit IS connected with the first end of the detection resistor; the GND end of the battery protection circuit is connected with the second end of the detection resistor; the DO end of the battery protection circuit is connected with the grid electrode of the discharge MOS tube; the CO end of the battery protection circuit is connected with the grid electrode of the charging MOS tube; the second end of the battery protection circuit is connected with the input cathode of the battery temperature detection circuit; the battery positive electrode of the battery is connected with the input positive electrode; the battery cathode of the battery is connected with the ground terminal; the second end of the detection resistor is also connected between the negative electrode of the battery and the ground end; the source electrode of the discharge MOS tube is connected with the input cathode; the drain electrode of the discharging MOS tube is connected with the source electrode of the charging MOS tube; the drain electrode of the charging MOS tube is connected between the first end and the CO end of the detection resistor. Therefore, the internal temperature of the battery can be accurately detected on the premise that a temperature-sensitive resistor is not required to be additionally arranged, so that the accuracy of a battery temperature detection result is improved, and meanwhile, the detection cost can be reduced.
Referring to fig. 8, fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the application. As shown in fig. 8, the electronic device 800 includes a processor 810, a memory 820, and a bus 830.
The memory 820 stores machine-readable instructions executable by the processor 810, and when the electronic device 800 is running, the processor 810 and the memory 820 communicate through the bus 830, and when the machine-readable instructions are executed by the processor 810, the steps of the method for detecting the internal temperature of the battery in the method embodiment shown in fig. 1 can be executed, and detailed implementation manner can be referred to the method embodiment and will not be repeated herein.
The embodiment of the present application further provides a computer readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps of the method for detecting the internal temperature of the battery in the method embodiment shown in fig. 1 may be executed, and the specific implementation manner may refer to the method embodiment and will not be described herein.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Finally, it should be noted that: the above examples are only specific embodiments of the present application, and are not intended to limit the scope of the present application, but it should be understood by those skilled in the art that the present application is not limited thereto, and that the present application is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (10)

1. A method for detecting the internal temperature of a battery, characterized by being applied to a battery temperature detection circuit; the detection method comprises the following steps:
acquiring voltage values at two ends of a detection resistor in the battery temperature detection circuit, a battery internal resistance value of a battery and a thermal resistance value of the battery for radiating heat to the detection resistor in the battery temperature detection circuit;
determining a current value of a current flowing in the battery temperature detection circuit based on a resistance value of the detection resistor and the voltage value;
determining battery heating power of the battery during power supply by utilizing the battery internal resistance value and the current value;
and based on the battery heating power and the thermal resistance value, determining the internal temperature of the battery by combining the chip temperature detected by the battery protection circuit in the battery temperature detection circuit.
2. The method according to claim 1, wherein the step of obtaining the voltage value across the detection resistor in the battery temperature detection circuit includes:
detecting a first output voltage of an IS terminal and a second output voltage of a GND terminal of the battery protection circuit respectively;
and determining the output voltage difference between the first output voltage and the second output voltage as the voltage value of the detection resistor.
3. The method of detection according to claim 1, wherein the method of detection further comprises:
and according to the comparison relation between the internal temperature of the battery and the temperature threshold value, determining the working state of the battery by controlling the level signal output by the CO end or the DO end of the battery protection circuit.
4. The detection method according to claim 3, wherein the temperature threshold includes a charge over-temperature threshold, a discharge over-temperature threshold, a charge low-temperature threshold, and a discharge low-temperature threshold; the determining the working state of the battery by controlling the level signal output by the CO end or the DO end of the battery protection circuit according to the comparison relation between the internal temperature of the battery and the temperature threshold value comprises the following steps:
if the internal temperature is greater than the charging overtemperature threshold, controlling the CO end to output a low-level signal so as to enable the battery to be in a high-temperature charge inhibition state; or alternatively, the first and second heat exchangers may be,
if the internal temperature is greater than the discharge over-temperature threshold, controlling the DO end to output a low-level signal so as to enable the battery to be in a high-temperature discharge inhibition state; or alternatively, the first and second heat exchangers may be,
if the internal temperature is greater than the charging low-temperature threshold, controlling the CO end to output a low-level signal so as to enable the battery to be in a low-temperature charge inhibition state; or alternatively, the first and second heat exchangers may be,
and if the internal temperature is greater than the discharge low-temperature threshold, controlling the DO end to output a low-level signal so as to enable the battery to be in a low-temperature discharge forbidden state.
5. The battery temperature detection circuit is characterized by comprising a battery protection circuit, a detection resistor, a battery, a discharge MOS tube and a charging MOS tube;
the first end of the battery protection circuit is connected with the input positive electrode of the battery temperature detection circuit; the IS end of the battery protection circuit IS connected with the first end of the detection resistor; the GND end of the battery protection circuit is connected with the second end of the detection resistor; the DO end of the battery protection circuit is connected with the grid electrode of the discharge MOS tube; the CO end of the battery protection circuit is connected with the grid electrode of the charging MOS tube; the second end of the battery protection circuit is connected with the input cathode of the battery temperature detection circuit;
the battery anode of the battery is connected with the input anode; the battery cathode of the battery is connected with the ground terminal;
the second end of the detection resistor is also connected between the battery cathode and the ground end;
the source electrode of the discharge MOS tube is connected with the input cathode; the drain electrode of the discharging MOS tube is connected with the source electrode of the charging MOS tube; the drain electrode of the charging MOS tube is connected between the first end of the detection resistor and the CO end.
6. The battery temperature detection circuit of claim 5, wherein the battery protection circuit comprises a power calculation module, a temperature calculation module, a charge/discharge control module, a first driver, and a second driver;
the current input end of the power calculation module IS used as the IS end; the power output end of the power calculation module is connected with the power input end of the temperature calculation module;
the temperature output end of the temperature calculation module is connected with the first input end of the charge/discharge control module; the first output end of the charge/discharge control module is connected with the control signal input end of the first driver; the second output end of the charge/discharge control module is connected with the control signal input end of the second driver;
a first output end of the first driver is used as the CO end; a second output end of the first driver is used as the input negative electrode;
a first output end of the second driver is used as the DO end; the second output terminal of the second driver serves as the GND terminal.
7. The battery temperature detection circuit of claim 6, wherein the battery protection circuit further comprises a voltage detection module, a discharge over-current detection module, and a short circuit detection module;
the input ends of the voltage detection module, the discharge overcurrent detection module and the short circuit detection module are all connected with the input anode;
the output end of the voltage detection module is connected with the second input end of the charge/discharge control module; the output end of the discharge overcurrent detection module is connected with the third input end of the charge/discharge control module; the output end of the short circuit detection module is connected with the fourth input end of the charge/discharge control module.
8. The battery temperature detection circuit of claim 6, wherein the power calculation module comprises a first analog-to-digital converter, a first multiplier, and a second multiplier;
the analog signal input end of the first analog-to-digital converter IS used as the current input end of the power calculation module and IS connected with the IS end; the digital signal output end of the first analog-to-digital converter is connected with the input end of the first multiplier; the output end of the first multiplier is connected with the input end of the second multiplier; the output end of the second multiplier is used as the power output end of the power calculation module.
9. The battery temperature detection circuit of claim 6, wherein the temperature calculation module comprises a third multiplier, a first adder, a second analog-to-digital converter, and a temperature detection module;
the input end of the third multiplier is used as the power input end of the temperature calculation module; the output end of the third multiplier is connected with the first input end of the first adder; the output end of the first adder is used as the temperature output end of the temperature calculation module;
the analog signal input end of the second analog-to-digital converter is connected with the temperature voltage output end of the temperature detection module; the digital signal output end of the second analog-to-digital converter is connected with the second input end of the first adder;
the temperature detection module is used for detecting a thermal resistance value of heat dissipation of the battery to the detection resistor in the battery temperature detection circuit.
10. The battery temperature detection circuit of claim 9, wherein the temperature detection module comprises a current source and a transistor;
the negative electrode of the current source is connected with the collector electrode of the transistor; the emitter of the transistor is grounded; and the base electrode of the transistor is used as a temperature voltage output end of the temperature detection module.
CN202311000982.XA 2023-08-09 2023-08-09 Method for detecting internal temperature of battery and battery temperature detection circuit Pending CN116878683A (en)

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CN202311000982.XA CN116878683A (en) 2023-08-09 2023-08-09 Method for detecting internal temperature of battery and battery temperature detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311000982.XA CN116878683A (en) 2023-08-09 2023-08-09 Method for detecting internal temperature of battery and battery temperature detection circuit

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