CN107525602B - Middle-upper battery pack temperature detection circuit in battery pack serial body - Google Patents
Middle-upper battery pack temperature detection circuit in battery pack serial body Download PDFInfo
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- CN107525602B CN107525602B CN201710731753.3A CN201710731753A CN107525602B CN 107525602 B CN107525602 B CN 107525602B CN 201710731753 A CN201710731753 A CN 201710731753A CN 107525602 B CN107525602 B CN 107525602B
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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
- 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
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Abstract
The invention discloses an upper battery pack temperature detection circuit in a battery pack serial body, which comprises a thermistor temperature detection circuit, a resistance signal conversion circuit, a reference voltage generation circuit, a lower battery pack voltage circuit and an operational amplifier differential circuit, wherein the thermistor temperature detection circuit is connected with the lower battery pack voltage circuit; the input end of the reference voltage generating circuit is respectively connected with the anode and the cathode of the upper battery pack to output reference voltage, and the resistance signal is converted into a voltage signal by the resistance signal converting circuit; and the operational amplifier differential circuit subtracts the voltage value of the lower battery pack and outputs a voltage signal corresponding to the temperature signal of the upper battery pack in the battery pack serial body. According to the invention, by designing the reference voltage generating circuit and the operational amplifier differential circuit of the upper battery pack, the part of the voltage signal representing the temperature signal in the upper battery pack, which is influenced by the lower battery pack, is eliminated, so that the voltage signal representing the temperature signal integrally moves downwards to the range of voltage which can be identified by the processor, and the temperature detection accuracy of the upper battery pack is improved.
Description
Technical Field
The invention relates to the field of circuits, in particular to a circuit for detecting the temperature of an upper battery pack in a battery pack serial body.
Background
The battery pack is a sealed whole assembled by one or more battery cells and corresponding battery cell management circuits, a thermistor which changes along with the temperature is connected between a temperature joint and a negative joint in an external interface, and the thermistor is attached to the battery cells in the battery pack and used for detecting the temperature of the battery cells in the pack outside so as to take protective measures when necessary. When a battery power supply part is designed in the circuit design, if a single battery pack with enough battery cores is not selected, but two or more battery packs which are already mature and mass-produced are adopted for series power supply, because the voltage signal which is acquired by the thermistor of the upper battery pack and represents the temperature is relative to the total negative voltage after the plurality of battery packs are connected in series, the voltage signal which is acquired by the thermistor of the upper battery pack and represents the temperature is integrally lifted by the lower battery pack, conversion processing is needed, and the voltage range which can be identified by a signal processor is converted on the premise of not losing temperature information. The technical problem of accurately detecting the temperature of an upper battery pack is that the temperature detection of the upper battery pack is ignored in the industry or directly, the temperature of the upper battery pack is presumed according to the temperature data of a lower battery pack in a series connection relation, but the dynamic characteristics of each battery pack are difficult to keep consistent from time to time, so that the monitoring risk degree exists; or the detection circuit for the temperature of the upper package is too complex, the power consumption is large, the cost is high, and the stability is insufficient.
Therefore, the prior art has yet to be improved.
Disclosure of Invention
The invention mainly aims to provide a temperature detection circuit for an upper battery pack in a battery pack serial body, and aims to overcome the technical defects of the temperature detection circuit for the upper battery pack in the existing battery pack serial body.
The invention provides an upper battery pack temperature detection circuit in a battery pack serial body, which comprises a thermistor temperature detection circuit, a resistance signal conversion circuit, a reference voltage generation circuit, a lower battery pack voltage circuit and an operational amplifier differential circuit, wherein the thermistor temperature detection circuit is connected with the lower battery pack voltage circuit;
one end of the thermistor temperature detection circuit is connected with the negative electrode end of the upper battery pack, and the other end of the thermistor temperature detection circuit is connected with the input end of the circuit for converting the resistance signal into the voltage signal;
the input end of the reference voltage generating circuit is respectively connected with the anode and the cathode of the upper battery pack to output reference voltage, and the output end of the reference voltage generating circuit is connected with the input end of the circuit for converting the resistance signal into the voltage signal so as to convert the resistance signal of the circuit for detecting the temperature by the thermistor into the voltage signal;
the input end of the operational amplifier differential circuit is respectively connected with the output end of the circuit for converting the resistance signal into the voltage signal and the output end of the voltage circuit of the lower battery pack, and the output end of the operational amplifier differential circuit outputs the voltage signal corresponding to the temperature signal of the upper battery pack in the series connection body of the battery packs.
Preferably, the reference voltage generating circuit comprises a voltage stabilizer and two voltage stabilizing resistors;
the voltage stabilizer is connected between the anode and the cathode of the upper battery pack; the two voltage-stabilizing resistors comprise a first voltage-stabilizing resistor and a second voltage-stabilizing resistor which are connected in series, the first voltage-stabilizing resistor is connected between the anode and the reference electrode of the voltage stabilizer, and the second voltage-stabilizing resistor is connected between the cathode and the reference electrode of the voltage stabilizer.
Preferably, the reference voltage generating circuit comprises a first triode serving as a voltage-stabilizing adjusting tube and having strong loading capacity;
the first triode is connected between the voltage stabilizer and the second voltage stabilizing resistor; the base electrode of the first triode is connected with the cathode of the voltage stabilizer, the collector electrode of the first triode is connected with the anode of the upper battery pack, and the emitting electrode of the first triode is connected with the second voltage stabilizing resistor.
Preferably, a resistor is connected between the base and the collector of the first triode so as to supply power to the base of the first triode and also supply power to the voltage stabilizer, and a reverse voltage clamping prevention diode is connected between the base and the emitter of the first triode in a reverse direction so as to prevent a PN junction between the base and the emitter of the first triode from being broken down by reverse spike voltage.
Preferably, the reference voltage generating circuit further includes a diode; the anode of the diode is connected with the anode of the upper battery pack, and the cathode of the diode is connected with the collector of the first triode.
Preferably, the reference voltage generating circuit further includes a capacitor; the capacitor is connected in parallel with two ends of the first voltage-stabilizing resistor and the second voltage-stabilizing resistor which are connected in series.
Preferably, the resistance signal conversion to voltage signal circuit comprises a voltage dividing resistor connected in series with a thermistor, so as to convert the resistance signal of the thermistor temperature detection circuit into a voltage signal in combination with the reference voltage generated by the reference voltage generation circuit.
Preferably, the operational amplifier differential circuit comprises a standby low-power-consumption control circuit, one end of the standby low-power-consumption control circuit is connected with the circuit for converting the resistance signal into the voltage signal, and the other end of the standby low-power-consumption control circuit is connected with the voltage circuit of the lower battery pack.
Preferably, the standby-time low-power consumption control circuit comprises a main board voltage source, a second triode and two MOS switches;
the main board voltage source is connected with the base electrode of the second triode so as to control the second triode to be switched on or switched off;
the two MOS switches are respectively positioned at the lower battery pack voltage circuit and one end of the voltage signal circuit for converting the resistance signal into the output voltage signal of the voltage signal circuit, and the control grids of the two MOS switches are respectively connected to the collector of the second triode.
Preferably, the device also comprises a signal output acquisition circuit; the signal output acquisition circuit is connected with the output end of the operational amplifier differential circuit;
the signal output acquisition circuit comprises an MCU processor or an AD device so as to perform data processing on the obtained voltage signal representing the temperature information.
The invention has the technical effects that: according to the invention, by designing the reference voltage generating circuit and the operational amplifier differential circuit of the upper battery pack, the part of the voltage signal representing the temperature signal in the upper battery pack, which is influenced by the lower battery pack, is eliminated, so that the voltage signal representing the temperature signal integrally moves downwards to the range of voltage which can be identified by the processor, and the temperature detection accuracy of the upper battery pack is improved. The upper battery pack temperature detection circuit in the battery pack serial body not only solves the problem of upper battery pack temperature detection, but also is designed with an upper battery pack temperature detection circuit which is small in power consumption, high in accuracy, good in stability, small in complexity and low in cost, provides an effective temperature control mode for battery application, and accelerates the expansion speed of the new energy application field.
Drawings
Fig. 1 is a schematic diagram of a module structure of a temperature detection circuit of an upper battery pack in a series of battery packs according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a battery pack string according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a circuit for detecting the temperature of a battery pack in a series of battery packs according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a reference voltage generating circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a lower battery pack voltage circuit and an operational amplifier differential circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a principle of temperature measurement by serially connecting resistors and dividing the voltage according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, an embodiment of the present invention provides an upper battery pack 2 temperature detection circuit in a battery pack serial body, including a thermistor temperature detection circuit 100, a resistance signal to voltage signal conversion circuit 200, a reference voltage generation circuit 300, a lower battery pack 1 voltage circuit 400, and an operational amplifier differential circuit 500;
one end of the thermistor temperature detection circuit 100 is connected with the negative end of the upper battery pack 2, and the other end is connected with the input end of the resistance signal conversion to voltage signal circuit 200;
the input end of the reference voltage generating circuit 300 is respectively connected with the positive electrode and the negative electrode of the upper battery pack 2 to output reference voltage, and the output end of the reference voltage generating circuit 300 is connected with the input end of the resistance signal converting circuit 200 so as to convert the resistance signal of the thermistor temperature detecting circuit 100 into a voltage signal;
the input end of the operational amplifier differential circuit 500 is connected with the output end of the circuit 200 for converting the resistance signal into the voltage signal and the output end of the voltage circuit 400 of the lower battery pack 1, respectively, and the output end of the operational amplifier differential circuit 500 outputs the voltage signal corresponding to the temperature information of the upper battery pack 2 in the battery pack serial body.
Referring to fig. 2, the embodiment of the present invention takes two battery packs connected in series to form a series connection body as an example, and includes an upper battery pack 2 and a lower battery pack 1, and a thermistor 20 and a thermistor 10 connected to a negative electrode of a detection battery pack are respectively present in the upper battery pack 2 and the lower battery pack 1 so as to detect the temperature of the corresponding battery pack. A series connection body formed by connecting a plurality of battery packs in series can be named as a battery pack 1, a battery pack 2, a battery pack 3, … and a battery pack n from bottom to top respectively, each battery pack is provided with a corresponding thermistor 10, a corresponding thermistor 20, a corresponding thermistor 30, a corresponding thermistor … and a corresponding thermistor n0 which are connected with the negative electrode of each battery pack, in the embodiment, two battery packs are connected in series to form a series connection body, and the temperature signal detected at a T2 position is B1 relative to the total negative-In terms of voltage, upper batteryThe temperature signal of package 2 is raised by battery package 1 is whole down, so the temperature parameter that T2 department detected is not the real-time temperature of last battery package, takes place data distortion, is unfavorable for the temperature of battery package in real-time management and control, has the potential safety hazard. The temperature detection distortion of the upper battery pack n near the total positive electrode after the plurality of battery packs are connected in series is serious. Referring to fig. 3, fig. 1 and fig. 5, in the embodiment of the present invention, a reference voltage generating circuit 300 is designed to generate a respective reference voltage, for example, 5V, with respect to a negative electrode of each battery pack, and the reference voltage generating circuit 300 is respectively connected to the thermistor temperature detecting circuit 100 of each battery pack, so that each battery pack performs temperature detection at the respective reference voltage, so as to improve detection accuracy; UP5V reference voltage with high accuracy and good stability is generated by the positive electrode and the negative electrode of the upper battery pack 2, and then the reference voltage is converted into a T2 voltage signal by a series voltage dividing resistor R1 in the voltage signal circuit 200 through a resistance signal. Simultaneously, the operational amplifier differential circuit 500 subtracts B2 in the T2 voltage signal-The voltage, i.e., the real-time voltage B1+ of the lower package 1 is subtracted to get rid of the influence of the lower package 1. The battery pack to be detected at the position, close to the total positive pole, of a series body formed by connecting a plurality of battery packs in series is a battery pack n, the battery packs between the battery pack n and the total negative pole are respectively a battery pack (n-1), a battery pack (n-2), …, a battery pack 2 and a battery pack 1, and the temperature signals of the battery packs in the series body can be accurately detected one by repeating the descending process, for example, the voltage signal output by a thermistor of an upper battery pack 2 is 20.9V, the voltage of a lower battery pack 1 is 20V, the voltage signal corresponding to the temperature signal of the upper battery pack is only 0.9V, and the voltage signal corresponding to the temperature signal acquired by the thermistor of the upper battery pack 2 is seriously distorted due to the voltage interference of the lower battery pack 1. In the embodiment of the invention, the voltage signal of the lower battery pack 1 is removed to obtain the real voltage signal corresponding to the temperature signal of the upper battery pack 2, so that the problem of temperature signal distortion of the upper battery pack 2 is solved; meanwhile, the voltage signals of the lower battery pack 1 included in the upper battery pack 2 are removed, so that the voltage signals corresponding to the temperature signals of the upper battery pack 2 integrally move downwards to a voltage range which can be identified by a processor in the signal output acquisition circuit 700, and the temperature signals are output more accurately. Electricity in the embodiments of the present inventionGo up battery package 2 temperature detect circuit in the battery package series connection body, not only solved last battery package 2 temperature detect problem, it is small to have designed power consumptive moreover, and the accuracy is high, the stability is good, the little and with low costs last battery package 2 temperature detect circuit of complexity, provides effectual temperature management and control mode for the application of battery package series connection body for the expanding speed of new forms of energy application field. The reference voltage in this embodiment is determined according to the operating voltage range of the processor in the signal output acquisition circuit 700, and other voltage values such as 3.3V may be selected as the reference voltage in the embodiments of the present invention. In the operational amplifier differential circuit 500 of the embodiment of the present invention, the operational amplifier U2 uses the operational amplifier U2 used by the original motor in the system, and the operational amplifier U2 of the embodiment of the present invention does not increase the cost because the operational amplifier U2 used by the original motor is idle in the a path and the B path. The input terminal of the voltage circuit 400 of the lower battery pack 1 in the embodiment of the present invention is the positive terminal of the lower battery pack 1, and is the negative terminal of the upper battery pack 2 due to the series connection relationship.
Referring to fig. 4, the reference voltage generating circuit 300 includes a regulator U4 and two regulator resistors;
the voltage stabilizer U4 is connected between the anode and the cathode of the upper battery pack; the two voltage-stabilizing resistors comprise a first voltage-stabilizing resistor R47 and a second voltage-stabilizing resistor R45 which are connected in series, the first voltage-stabilizing resistor R47 is connected between the anode and the reference electrode of the voltage stabilizer U4, and the second voltage-stabilizing resistor R45 is connected between the cathode and the reference electrode of the voltage stabilizer.
The voltage stabilizer U4 of the embodiment of the invention is a voltage stabilizing integrated circuit with low power consumption, high accuracy and good stability, and is used for providing stable voltage as a reference and improving the accuracy of temperature detection. The resistance values and precision specification parameters of the two voltage stabilizing resistors are the same, such as: the resistance values are all 10K, and the precision is all ± 1%, so as to raise the fixed 2.5V precision voltage provided inside the voltage regulator U4 to the above-mentioned reference voltage 5V required by the embodiment of the present invention.
Further, the reference voltage generating circuit 300 further includes a first transistor Q3;
the first triode Q3 is connected between the voltage stabilizer U4 and the second voltage stabilizing resistor R45; the base electrode of the first triode Q3 is connected with the cathode of the voltage stabilizer U4, the collector electrode of the first triode Q3 is connected with the anode of the upper battery pack 2, and the emitting electrode of the first triode Q3 is connected with the second voltage-stabilizing resistor R45.
In the embodiment of the invention, the first triode Q3 is a voltage-stabilizing regulating tube and shares the difference voltage part of the input unstable voltage and the output 5V stable voltage, namely the input voltage is equal to the voltage drop of Q3 plus the output voltage, and the output voltage is stabilized after the unstable input voltage is regulated in real time by Q3. In addition, Q3 has strong current endurance capability to improve the load capability of the reference voltage generating circuit 300. In another embodiment of the present invention, the first transistor Q3 may be replaced by a resistor as a regulator when the current is small.
Further, a resistor R29 is connected between the base and the collector of the first triode Q3 to supply power to the base of Q3 and the U4, and a reverse voltage prevention clamping diode D5 is connected between the base and the emitter of the first triode Q3 in a reverse direction to prevent the PN junction between the base and the emitter of the first triode Q3 from being broken down by reverse spike voltage, so that the first triode Q3 is protected from being damaged, and the service life of the first triode Q3 is prolonged.
Further, the reference voltage generating circuit 300 further includes a diode D1;
the anode of the diode D1 is connected with the anode of the upper battery pack 2, and the cathode of the diode D1 is connected with the collector of the first triode Q3, so that current backflow caused by misoperation is prevented, and normal operation of the circuit is guaranteed.
Further, the reference voltage generating circuit 300 further includes a capacitor C3; the capacitor C3 is connected in parallel with two ends of the first voltage-stabilizing resistor R47 and the second voltage-stabilizing resistor R45 which are connected in series, so that filtering is carried out before the reference voltage is output, and the stability of the reference voltage is improved.
Further, the circuit 200 for converting the resistance signal into the voltage signal includes a voltage dividing resistor R connected in series with the thermistor 201The thermistor detects the resistance signal of the temperature circuit 100 with the reference voltage generated by the reference voltage generating circuit 300Converted into a voltage signal.
Referring to FIG. 6, RTFor a thermistor, also called a temperature resistor, as the name implies, the resistance value changes with the temperature change, and the temperature and the resistance value have a one-to-one correspondence relationship, so that the current temperature is known by knowing the current resistance value.
The principle of the resistor series voltage division temperature measurement is as follows:
U＝RI＝(R1+RT)I；
UT＝RTI；
UT/U＝RTI/[(R1+RT)I]＝RT/(R1+RT)；
UT＝U*RT/(R1+RT)＝5V*RT/(10KΩ+RT)；
in the embodiment of the invention, the reference voltage is 5V, and the divider resistor R1Is 10K omega; t represents the temperature, RTIs a function of T, I represents the current.
Let RTF (T), then UT5f (t)/(10+ f (t)); so UTIs a function of T, let UTG (T), then UTG (T) 5f (T)/(10+ f (T)), then T g(-1)(UT) To obtain UTThe value, the temperature T can be obtained.
Further, the operational amplifier differential circuit 500 includes a standby low power consumption control circuit 600, one end of the standby low power consumption control circuit 600 is connected to the voltage signal circuit 200 for converting the resistance signal, the other end of the standby low power consumption control circuit is connected to the voltage circuit 400 of the lower battery pack 1, the standby low power consumption control circuit 600 further includes a control end, and the control end is a main board voltage source which is absent in standby and is available when the device is started.
The standby-time low-power-consumption control circuit 600 of the embodiment of the invention can realize low power consumption of the temperature detection circuit of the upper battery pack 2 in the battery pack serial body in a non-operating state so as to realize energy conservation.
Further, the standby-time low power consumption control circuit 600 includes a main board voltage source +16V, a second transistor Q7, and two MOS switches Q4 and Q9;
the main board voltage source +16V is connected with the base electrode of the second triode Q7 so as to control the second triode Q7 to be switched on or switched off;
the two MOS switches Q4 and Q9 are respectively located at the lower battery pack 1 voltage circuit 400 and the end of the voltage signal circuit 200 for converting the resistance signal into the output voltage signal, and the control gates of the two MOS switches Q4 and Q9 are respectively connected to the collector of the second transistor Q7.
In the embodiment of the invention, when the temperature detection circuit of the upper battery pack 2 in the battery pack serial body is in a non-operating state, the collector and the emitter of the second triode Q7 are disconnected, so that the two MOS switches Q4 and Q9 which are respectively positioned at the voltage circuit 400 of the lower battery pack 1 and one end of the voltage signal circuit 200 for converting the resistance signal into the voltage signal output by the voltage signal circuit are in a disconnected state, and the temperature detection circuit of the upper battery pack 2 is in a non-operating state; after the power-on, a main board voltage source +16V is available from the beginning, a voltage value is given to activate the second triode Q7, so that a path is formed between the collector and the emitter of the second triode, and then a voltage difference exists between the source and the gate of each of the two MOS switches Q4 and Q9, the voltage difference enables the source and the drain of each of the Q4 and Q9 to be communicated, and then the two paths of voltages are sent to the input end of the operational amplifier U2 to be subjected to subtraction operation, so that the temperature detection circuit of the upper battery pack 2 enters a working state. In the embodiment of the invention, one main board voltage source is + 16V. In another embodiment of the present invention, the voltage value of one motherboard voltage source may be other voltage values that satisfy the application.
Further, the device also comprises a signal output acquisition circuit 700; the signal output acquisition circuit 700 is connected with the output end of the operational amplifier differential circuit 500;
the signal output acquisition circuit 700 includes an MCU processor or an AD device, and performs data processing on the obtained voltage signal representing the temperature information.
In the embodiment of the invention, the reference voltage generating circuit 300 with small power consumption and the operational amplifier differential circuit 500 are designed, so that the part of the voltage signal representing the temperature information in the upper battery pack 2, which is influenced by the lower battery pack 1, is eliminated, the voltage signal representing the temperature information integrally moves downwards to the voltage range which can be identified by the processor of the signal output acquisition circuit 700, and the temperature detection accuracy of the upper battery pack 2 is improved. The upper battery pack 2 temperature detection circuit in the battery pack series body in the embodiment of the invention not only solves the technical problem of upper battery pack 2 temperature detection, but also designs the upper battery pack 2 temperature detection circuit which has the advantages of low power consumption, high accuracy, good stability, small complexity and low cost, provides an effective temperature control mode for the combined application of the battery packs, and accelerates the expansion speed of the new energy application field.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. An upper battery pack temperature detection circuit in a battery pack serial body is characterized by comprising a thermistor temperature detection circuit, a resistance signal conversion circuit, a reference voltage generation circuit, a lower battery pack voltage circuit and an operational amplifier differential circuit;
one end of the thermistor temperature detection circuit is connected with the negative electrode end of the upper battery pack, and the other end of the thermistor temperature detection circuit is connected with the input end of the circuit for converting the resistance signal into the voltage signal;
the input end of the reference voltage generating circuit is respectively connected with the anode and the cathode of the upper battery pack to output reference voltage, and the output end of the reference voltage generating circuit is connected with the input end of the circuit for converting the resistance signal into the voltage signal so as to convert the resistance signal of the circuit for detecting the temperature by the thermistor into the voltage signal;
the input end of the operational amplifier differential circuit is respectively connected with the output end of the circuit for converting the resistance signal into a voltage signal and the output end of the voltage circuit of the lower battery pack, and the output end of the operational amplifier differential circuit outputs a voltage signal corresponding to a temperature signal of the upper battery pack in the series-connected body of the battery packs;
the reference voltage generating circuit comprises a voltage stabilizer and two voltage stabilizing resistors;
the voltage stabilizer is connected between the anode and the cathode of the upper battery pack; the two voltage-stabilizing resistors comprise a first voltage-stabilizing resistor and a second voltage-stabilizing resistor which are connected in series, the first voltage-stabilizing resistor is connected between the anode and the reference electrode of the voltage stabilizer, and the second voltage-stabilizing resistor is connected between the cathode and the reference electrode of the voltage stabilizer;
the reference voltage generating circuit comprises a first triode;
the first triode is connected between the voltage stabilizer and the second voltage stabilizing resistor; the base electrode of the first triode is connected with the cathode of the voltage stabilizer, the collector electrode of the first triode is connected with the anode of the upper battery pack, and the emitter electrode of the first triode is connected with the second voltage stabilizing resistor;
a resistor is connected between the base electrode and the collector electrode of the first triode so as to supply power to the base electrode of the first triode and supply power to the voltage stabilizer at the same time, and a reverse voltage prevention clamping diode is connected between the base electrode and the emitter electrode of the first triode in a reverse direction so as to prevent a PN junction between the base electrode and the emitter electrode of the first triode from being broken down by reverse spike voltage;
the reference voltage generating circuit further includes a diode;
the anode of the diode is connected with the anode of the upper battery pack, and the cathode of the diode is connected with the collector of the first triode;
the reference voltage generating circuit further comprises a capacitor; the capacitor is connected in parallel with two ends of the first voltage-stabilizing resistor and the second voltage-stabilizing resistor which are connected in series.
2. The upper battery pack temperature detection circuit in a battery pack series body according to claim 1, wherein the resistance signal conversion to voltage signal circuit includes a voltage dividing resistor connected in series with a thermistor to convert the resistance signal of the thermistor temperature detection circuit to a voltage signal in conjunction with the reference voltage generated by the reference voltage generation circuit.
3. The upper battery pack temperature detection circuit in a battery pack series connection body according to claim 1, wherein the operational amplifier differential circuit includes a standby low power consumption control circuit, one end of the standby low power consumption control circuit is connected to the circuit for converting the resistance signal into the voltage signal, and the other end of the standby low power consumption control circuit is connected to the voltage circuit of the lower battery pack.
4. The upper battery pack temperature detection circuit in the battery pack series body according to claim 3, wherein the standby low power consumption control circuit includes a main board voltage source, a second triode and two MOS switches;
the main board voltage source is connected with the base electrode of the second triode so as to control the second triode to be switched on or switched off;
the two MOS switches are respectively positioned at the lower battery pack voltage circuit and one end of the voltage signal circuit for converting the resistance signal into the output voltage signal of the voltage signal circuit, and the control grids of the two MOS switches are respectively connected with the collector electrode of the second triode.
5. The upper battery pack temperature detection circuit in a battery pack series body according to claim 1, further comprising a signal output acquisition circuit; the signal output acquisition circuit is connected with the output end of the operational amplifier differential circuit;
the signal output acquisition circuit comprises an MCU processor or an AD device so as to perform data processing on the obtained voltage signal.
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| CN114563101B (en) * | 2022-02-28 | 2024-09-06 | 重庆长安新能源汽车科技有限公司 | High-precision temperature acquisition circuit, method and vehicle |
| TWI833540B (en) * | 2023-01-05 | 2024-02-21 | 固緯電子實業股份有限公司 | Voltage detection circuit |
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| JP2001035542A (en) * | 1999-07-26 | 2001-02-09 | Nec Saitama Ltd | Detection method for battery pack and mobile terminal |
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| JP5338047B2 (en) * | 2007-08-07 | 2013-11-13 | ミツミ電機株式会社 | Battery pack |
| CN101609978A (en) * | 2008-06-20 | 2009-12-23 | 鸿富锦精密工业（深圳）有限公司 | Battery overheat protecting device and method |
| CN101446494A (en) * | 2008-11-27 | 2009-06-03 | 北京航空航天大学 | Temperature detection circuit for satellite-borne optical fiber gyroscope |
| CN205843837U (en) * | 2016-07-21 | 2016-12-28 | 安徽江淮汽车股份有限公司 | A kind of set of cells multichannel temperature testing circuit |
| CN106696733A (en) * | 2016-12-14 | 2017-05-24 | 芜湖市吉安汽车电子销售有限公司 | Anti-combustion monitoring system for new energy battery pack |
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2017
- 2017-08-23 CN CN201710731753.3A patent/CN107525602B/en active Active
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Effective date of registration: 20210201 Address after: 321000 No.16 Hongyun Road, Lanjiang street, Lanxi City, Jinhua City, Zhejiang Province (self declaration) Patentee after: Zhejiang Xindong Energy Technology Co.,Ltd. Address before: 518000, 1st floor, 2nd floor, A-B area, 2nd floor, D area-9th floor, Yihe Road, Shiyan Street, Baoan District, Shenzhen City, Guangdong Province Patentee before: SUNWODA ELECTRONICS Co.,Ltd. |