CN220136518U - Battery pack temperature detection circuit - Google Patents
Battery pack temperature detection circuit Download PDFInfo
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- CN220136518U CN220136518U CN202321604978.XU CN202321604978U CN220136518U CN 220136518 U CN220136518 U CN 220136518U CN 202321604978 U CN202321604978 U CN 202321604978U CN 220136518 U CN220136518 U CN 220136518U
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- 238000001514 detection method Methods 0.000 title claims abstract description 76
- 230000003287 optical effect Effects 0.000 claims abstract description 38
- 239000013307 optical fiber Substances 0.000 claims abstract description 36
- 239000003990 capacitor Substances 0.000 claims description 58
- 230000003321 amplification Effects 0.000 claims description 15
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 230000003750 conditioning effect Effects 0.000 claims 1
- 238000009529 body temperature measurement Methods 0.000 abstract description 10
- 101000869896 Homo sapiens Death-inducer obliterator 1 Proteins 0.000 description 7
- 101001053773 Homo sapiens Type I iodothyronine deiodinase Proteins 0.000 description 7
- 101001053754 Homo sapiens Type II iodothyronine deiodinase Proteins 0.000 description 7
- 102100024063 Type I iodothyronine deiodinase Human genes 0.000 description 7
- 102100024060 Type II iodothyronine deiodinase Human genes 0.000 description 7
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a battery pack temperature detection circuit which comprises a driving module, a light emitting module, an optical fiber, a first light detection module and a controller, wherein the driving module is connected with the light emitting module, and the light emitting module and the driving module are both connected with a power supply; the input end of the optical fiber is coupled with the light emitting module, and the output end of the optical fiber is coupled with the first light detection module; the first light detection module is also connected with the controller. According to the utility model, the temperature detection of the battery pack is realized through the optical fiber and the optical detection module, the temperature measurement precision is improved, and the temperature measurement stability is ensured.
Description
Technical Field
The utility model relates to the technical field of battery pack temperature detection, in particular to a battery pack temperature detection circuit.
Background
The temperature of the power battery has great influence on the performance, the service life and the safety of the power battery, and the temperature of the power battery plays a significant role in the BMS performance of the battery management system.
At present, an NTC thermistor is generally used as a temperature sensor to monitor the temperature of a power battery in an electric automobile, but the NTC thermistor is easily influenced by special working environments such as high temperature, high voltage, strong electromagnetic field and the like, so that temperature errors are caused, and the accuracy of temperature measurement is reduced.
Disclosure of Invention
Therefore, the utility model aims to provide at least one battery pack temperature detection circuit, which realizes the temperature detection of the battery pack through the optical fiber and the optical detection module, improves the temperature measurement precision and ensures the temperature measurement stability.
The utility model mainly comprises the following aspects:
in a first aspect, an embodiment of the present utility model provides a battery pack temperature detection circuit, where the battery pack temperature detection circuit includes a driving module, a light emitting module, an optical fiber, a first light detection module and a controller, the optical fiber is disposed inside a battery pack, the driving module is connected with the light emitting module, and the light emitting module and the driving module are both connected with a power supply; the input end of the optical fiber is coupled with the light emitting module, and the output end of the optical fiber is coupled with the first light detection module; the first light detection module is also connected with the controller.
In one possible implementation manner, the driving module comprises a voltage-stabilizing anti-reflection circuit, an operational amplification module and a power enhancement module, wherein the voltage-stabilizing anti-reflection circuit is connected with the input ends of the power supply and the operational amplification module respectively, the output end of the operational amplification module is connected with the input end of the power enhancement module, the first output end of the power enhancement module is connected with the light-emitting module, and the second output end of the power enhancement module is grounded.
In one possible implementation manner, the voltage stabilizing anti-reflection circuit comprises a first resistor, a second resistor, a first capacitor and an anti-reflection diode, the operational amplification module comprises a first operational amplifier, a second operational amplifier, a third resistor, a fourth resistor and a first adjusting resistor, one end of the first resistor is connected with a power supply, the other end of the first resistor is respectively connected with the positive input end of the first operational amplifier, one end of the second resistor, one end of the first capacitor and the negative electrode of the anti-reflection diode, and the other end of the second resistor is connected with the other end of the first capacitor and the positive electrode of the anti-reflection diode and then grounded; the negative input end of the first operational amplifier is connected with one end of a first adjusting resistor, the positive power input end of the first operational amplifier is connected with a power supply, the other end of the first adjusting resistor is grounded with the negative power input end of the first operational amplifier, the output end of the first operational amplifier is respectively connected with one end of a third resistor and the positive input end of the second operational amplifier, and the other end of the third resistor is connected with one end of the first adjusting resistor; the negative input end of the second operational amplifier is connected with the power enhancement module, the positive power input end of the second operational amplifier is connected with the power supply, the negative power input end of the second operational amplifier is grounded, the output end of the second operational amplifier is connected with one end of the fourth resistor, and the other end of the fourth resistor is connected with the power enhancement module.
In one possible implementation manner, the power enhancement module comprises a first triode, a second triode, a fifth resistor and a second capacitor, wherein a base electrode of the first triode is connected with the other end of the fourth resistor, and an emitter electrode of the first triode is respectively connected with a base electrode of the second triode and a negative input end of the second operational amplifier; the collector of the first triode and the collector of the second triode are connected with one end of the light-emitting module, the emitter of the second triode is respectively connected with one end of the fifth resistor and one end of the second capacitor, and the other end of the fifth resistor is connected with the other end of the second capacitor and then grounded.
In one possible implementation manner, the light emitting module comprises a light emitting diode and a sixth resistor, wherein one end of the sixth resistor is connected with a power supply, the other end of the sixth resistor is connected with the positive electrode of the light emitting diode, and the negative electrode of the light emitting diode is respectively connected with the collector electrode of the first triode and the collector electrode of the second triode; the light emitting diode is also coupled to one end of the optical fiber.
In one possible implementation manner, the battery pack temperature detection circuit further comprises a second optical detection module and an ultralow offset voltage operational amplifier, wherein the first optical detection module is connected with the positive input end of the ultralow offset voltage operational amplifier, the second optical detection module is connected with the negative input end of the ultralow offset voltage operational amplifier, the positive power input end of the ultralow offset voltage operational amplifier is connected with a power supply, and the negative voltage input end of the ultralow offset voltage operational amplifier is grounded; the output end of the ultralow offset voltage operational amplifier is connected with the controller.
In one possible implementation manner, the first optical detection module comprises a first optical detector, a first phase lead correction module, a third operational amplifier, a seventh resistor, an eighth resistor, a ninth resistor, a second adjusting resistor and a third capacitor, wherein the positive electrode of the first optical detector is connected with the negative input end of the third operational amplifier, the negative electrode of the first optical detector is connected with one end of the first phase lead correction module and then grounded, the other end of the first phase lead correction module is connected with the positive input end of the third operational amplifier, the positive voltage input end of the third operational amplifier is connected with a power supply, the negative voltage input end of the third operational amplifier is grounded, and the first optical detector is further coupled with the other end of the optical fiber; the output end of the third operational amplifier is respectively connected with one end of a seventh resistor and one end of a second regulating resistor, the other end of the seventh resistor is respectively connected with one end of an eighth resistor and the positive input end of the ultralow offset voltage operational amplifier, and the other end of the eighth resistor is grounded; one end of the ninth resistor is connected with one end of the third capacitor and then connected with the negative input end of the third operational amplifier, and the other end of the ninth resistor is connected with the other end of the third capacitor and then connected with the other end of the second regulating resistor.
In one possible implementation manner, the second light detection module comprises a second light detector, a second phase lead correction module, a fourth operational amplifier, a tenth resistor, an eleventh resistor, a twelfth resistor and a fourth capacitor, wherein the positive electrode of the second light detector is connected with the negative input end of the fourth operational amplifier, the negative electrode of the second light detector is connected with one end of the second phase lead correction module and then grounded, the other end of the second phase lead correction module is connected with the positive input end of the fourth operational amplifier, the positive voltage input end of the fourth operational amplifier is connected with a power supply, and the negative voltage input end of the fourth operational amplifier is grounded; one end of the tenth resistor is connected with one end of the fourth capacitor and then is connected with the negative input end of the fourth operational amplifier, and the other end of the tenth resistor is connected with the other end of the fourth capacitor and then is respectively connected with the output end of the fourth operational amplifier and one end of the eleventh resistor; the other end of the eleventh resistor is connected with one end of the twelfth resistor and the negative input end of the ultralow offset voltage operational amplifier respectively, and the other end of the twelfth resistor is connected with the output end of the ultralow offset voltage operational amplifier.
In one possible implementation manner, the first phase lead correction module in the first light detection module further comprises a thirteenth resistor and a fifth capacitor, and the second phase lead correction module comprises a fourteenth resistor and a sixth capacitor, wherein one end of the thirteenth resistor is connected with one end of the fifth capacitor and then connected with the negative electrode of the first light detector in the first light detection module, and the other end of the thirteenth resistor is connected with the other end of the fifth capacitor and then connected with the positive input end of the third operational amplifier; one end of the fourteenth resistor is connected with one end of the sixth capacitor and then connected with the negative electrode of the second optical detector, and the other end of the fourteenth resistor is connected with the other end of the sixth capacitor and then connected with the positive input end of the fourth operational amplifier.
In one possible implementation manner, the battery pack temperature detection circuit further comprises a fifth operational amplifier, a fifteenth resistor, a sixteenth resistor and a third regulating resistor, wherein one end of the fifteenth resistor is connected with the output end of the ultralow offset voltage operational amplifier, the other end of the fifteenth resistor is connected with the positive input end of the fifth operational amplifier, the negative input end of the fifth operational amplifier is respectively connected with one end of the sixteenth resistor and one end of the third regulating resistor, the positive voltage input end of the fifth operational amplifier is connected with a power supply, the negative voltage input end of the fifth operational amplifier is grounded, the other end of the sixteenth resistor is grounded, and the output end of the fifth operational amplifier is respectively connected with the other end of the third regulating resistor and the controller.
The battery pack temperature detection circuit provided by the embodiment of the utility model comprises a driving module, a light emitting module, an optical fiber, a first light detection module and a controller, wherein the driving module is connected with the light emitting module, and the light emitting module and the driving module are both connected with a power supply; the input end of the optical fiber is coupled with the light emitting module, and the output end of the optical fiber is coupled with the first light detection module; the first light detection module is also connected with the controller. According to the utility model, the temperature detection of the battery pack is realized through the optical fiber and the optical detection module, the temperature measurement precision is improved, and the temperature measurement stability is ensured.
In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.
However, this type of temperature sensor is mainly made by combining an oxidized compound of high-purity metal elements such as Mn with a semiconductor technology through a ceramic technology, and the working principle of the NTC thermistor is as follows: when the temperature increases or decreases, the number of carriers increases or decreases, respectively, and the internal resistance adaptability decreases or increases.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, 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 utility model 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 shows a first battery pack temperature detection circuit according to an embodiment of the present utility model;
fig. 2 shows a second battery pack temperature detection circuit according to an embodiment of the present utility model;
fig. 3 shows a third battery pack temperature detection circuit according to an embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model, and it should be understood that the drawings in the present utility model are for the purpose of illustration and description only and are not intended to limit the scope of the present utility model. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this disclosure, illustrates operations implemented according to some embodiments of the present utility model. It should be appreciated that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to or removed from the flow diagrams by those skilled in the art under the direction of the present disclosure.
In addition, the described embodiments are only some, but not all, embodiments of the utility model. The components of the embodiments of the present utility model 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 utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art based on embodiments of the utility model without making any inventive effort, fall within the scope of the utility model.
The temperature of the power battery has a great influence on the performance, the service life and the safety of the power battery. As shown in Table 1, it is generally desirable that the battery operate in the temperature range of 20-35℃, which allows for optimal power output and input to the vehicle, maximum available energy, and maximum cycle life.
List one
As can be seen from the first table, the temperature plays a significant role in BMS performance, and in order to further improve the battery utilization rate, prevent the battery from being excessively discharged (charged), control the battery working condition, increase the service life of the battery, and require a built-in temperature sensor in the battery pack to monitor the battery pack temperature.
NTC thermistors are now commonly used as temperature sensors to monitor the battery pack temperature, but thermistors NTC have the following drawbacks:
(1) the consistency is poor;
(2) the temperature resistance is poor, except for the special, the general temperature range is 0-150 ℃, the high temperature is easy to generate large drift, the permanent failure is seriously possibly generated, for example, the irreversible resistance drift of NTC is possibly caused by the high temperature during welding, the 5% drift is generally possibly caused, and in some areas such as northeast, the working performance of NTC is also greatly influenced by the excessively low temperature in cold winter;
(3) nonlinear and weak, limiting the application of thermistor NTCs;
(4) the components are easy to age, and the stability is poor;
(5) when the thermistor provides an output voltage signal, a self-heating effect is generated by an excessive bias current, which is a measurement error, if heat cannot be dissipated in time, the temperature of the NTC will rise, then the resistance will drop, at which time the current will increase significantly, the NTC will become hotter, and the cycle may eventually cause the NTC to burn out or even fire.
Based on this, the embodiment of the utility model provides a battery pack temperature detection circuit, which realizes the temperature detection of a battery pack through an optical fiber and a light detection module, improves the temperature measurement precision and ensures the temperature measurement stability, and specifically comprises the following steps:
referring to fig. 1, fig. 1 shows a first battery pack temperature detection circuit according to an embodiment of the utility model. As shown in fig. 1, a battery pack temperature detection circuit provided in an embodiment of the present utility model includes:
a drive module 1, a light emitting module 2, an optical fiber 3, a first light detection module 4 and a controller 5.
In a preferred embodiment, the driving module is connected to the light emitting module 2 and the power supply VCC, respectively, the light emitting module 2 is further connected to the power supply VCC, the input end of the optical fiber 3 is coupled to the light emitting module 2, the output end of the optical fiber 3 is coupled to the first light detecting module 4, and the first light detecting module 4 is further connected to the controller 5, wherein the optical fiber 3 is placed inside the battery pack.
In the utility model, the light emitting module 2 generates an optical signal under the driving of the power supply VCC and the driving module 1, the optical fiber 3 is used as a transmission medium of the optical signal, the optical signal generated by the light emitting module 2 is transmitted to the first light detecting module 4, and the first light detecting module 4 converts the received optical signal into a current signal and transmits the current signal to the controller 5.
Wherein, the power supply VCC can be a 5V external power supply.
Referring to fig. 2, fig. 2 shows a second battery pack temperature detection circuit according to an embodiment of the utility model. As shown in fig. 2, the driving module 1 includes a voltage stabilizing and anti-reflection circuit 11, an operational amplification module 12, and a power enhancement module 13.
Preferably, the voltage stabilizing anti-reverse circuit 11 is respectively connected with the power supply VCC and the input end of the operational amplification module 12, the output end of the operational amplification module 12 is connected with the input end of the power enhancement module 13, the first output end of the power enhancement module 13 is connected with the light emitting module 2, and the second output end of the power enhancement module 13 is grounded.
In an example, as shown in fig. 2, the battery pack temperature detection circuit further includes a second light detection module 6 and an ultralow offset voltage operational amplifier 7, where the ultralow offset voltage operational amplifier 7 may be an AD-OP07 operational amplifier.
Preferably, the first optical detection module 4 is connected with the positive input end in+ of the ultralow offset voltage operational amplifier 7, the second optical detection module 6 is connected with the negative input end IN-of the ultralow offset voltage operational amplifier 7, the positive power input end v+ of the ultralow offset voltage operational amplifier 7 is connected with the power supply VCC, the negative voltage input end of the ultralow offset voltage operational amplifier 7 is grounded to GND, and the output end of the ultralow offset voltage operational amplifier 7 is connected with the controller 5.
Referring to fig. 3, fig. 3 shows a third battery pack temperature detection circuit according to an embodiment of the utility model. As shown in fig. 3, the voltage stabilizing anti-reflection circuit 11 includes a first resistor R1, a second resistor R2, a first capacitor C1, and an anti-reflection diode D1, and the operational amplifier module 12 includes a first operational amplifier 121, a second operational amplifier 122, a third resistor R3, a fourth resistor R4, and a first adjusting resistor R01.
Preferably, one end of the first resistor R1 is connected to the power supply VCC, the other end of the first resistor R1 is connected to the positive input terminal in+ of the first operational amplifier 121, one end of the second resistor R2, one end of the first capacitor C1 and the negative electrode of the anti-reflection diode D1, and the other end of the second resistor R2 is connected to the other end of the first capacitor C1 and the positive electrode of the anti-reflection diode D1 and then grounded GND.
The negative input end IN-of the first operational amplifier 121 is connected with one end of a first adjusting resistor R01, the positive power input end V+ of the first operational amplifier 121 is connected with a power supply VCC, the negative power input end V-of the first operational amplifier 121 is grounded GND, the other end of the first adjusting resistor R01 is grounded GND, the output end of the first operational amplifier 121 is respectively connected with one end of a third resistor R3 and the positive input end IN+ of a second operational amplifier 122, and the other end of the third resistor R3 is connected with one end of the first adjusting resistor R01.
The negative input terminal IN-of the second operational amplifier 122 is connected to the power enhancing module 13, the positive power input terminal v+ of the second operational amplifier 122 is connected to the power supply VCC, the negative power input terminal V-of the second operational amplifier 122 is grounded GND, the output terminal of the second operational amplifier 122 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the power enhancing module 13.
The input current of the light emitting module 2 can be changed by changing the resistance value of the first adjusting resistor R01, so that the power of the light signal generated by the light emitting module 2, that is, the light intensity of the light signal generated by the light emitting module 2 is adjusted, specifically, before the circuit of the utility model is applied, the first adjusting resistor R01 is adjusted and fixed to a fixed value according to the type selected by the light emitting diode in the light emitting module 2, so that the light emitting module 2 generates a stable light signal, the first operational amplifier can select LF356 and the second operational amplifier can select OP177, the power supply VCC generates a voltage signal through the actions of the first operational amplifier 121 and the first adjusting resistor R01, and the voltage signal is input to the second operational amplifier 122, so as to realize chopper amplification of the voltage signal.
In a preferred embodiment, as shown in fig. 3, the power boost module 13 includes a first transistor DIO1, a second transistor DIO2, a fifth resistor R5, and a second capacitor C2.
The base b of the first triode DIO1 is connected to the other end of the fourth resistor R4, and the emitter e of the first triode DIO1 is connected to the base b of the second triode DIO2 and the negative input terminal IN-of the second operational amplifier 122, respectively.
The collector C of the first triode DIO1 and the collector C of the second triode DIO2 are connected with one end of the light-emitting module 2, the emitter e of the second triode DIO2 is respectively connected with one end of the fifth resistor R5 and one end of the second capacitor C2, and the other end of the fifth resistor R5 and the other end of the second capacitor C2 are connected with the ground GND.
The collector c of the first triode DIO1 and the collector c of the second triode DIO2 are connected in parallel, so as to improve the output power of the light emitting module 2.
As shown in fig. 3, the light emitting module 2 includes a light emitting diode LED and a sixth resistor R6.
Preferably, one end of the sixth resistor R6 is connected to the power supply VCC, the other end of the sixth resistor R6 is connected to the positive electrode of the light emitting diode LED, the negative electrode of the light emitting diode LED is connected to the collector e of the first triode DIO1 and the collector e of the second triode DIO2, respectively, and the light emitting diode LED is further coupled to one end of the optical fiber 3.
As shown in fig. 3, the first light detection module 4 includes a first light detector 41, a first phase lead correction module 42, a third operational amplifier 43, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second adjustment resistor R02, and a third capacitor C3.
Preferably, the positive electrode of the first photodetector 41 is connected to the negative input terminal IN-of the third operational amplifier 43, the negative electrode of the first photodetector 41 is connected to one end of the first phase lead correction module 42 and then to the ground GND, the other end of the first phase lead correction module 42 is connected to the positive input terminal in+ of the third operational amplifier 43, the positive voltage input terminal v+ of the third operational amplifier 43 is connected to the power supply VCC, the negative voltage input terminal V-of the third operational amplifier 43 is grounded GND, and the first photodetector 41 is further coupled to the other end of the optical fiber 3.
The output end of the third operational amplifier 43 is respectively connected with one end of a seventh resistor R7 and one end of a second adjusting resistor R02, the other end of the seventh resistor R7 is respectively connected with one end of an eighth resistor R8 and the positive input end IN+ of the ultralow offset voltage operational amplifier 7, and the other end of the eighth resistor R8 is grounded GND.
One end of the ninth resistor R9 is connected to one end of the third capacitor C3 and then to the negative input terminal IN-of the third operational amplifier 43, and the other end of the ninth resistor R9 is connected to the other end of the third capacitor C3 and then to the other end of the second adjustment resistor R02.
The first phase lead correction module 42 includes a thirteenth resistor R13 and a fifth capacitor C5, wherein one end of the thirteenth resistor R13 is connected to one end of the fifth capacitor C5 and then connected to the negative electrode of the first photodetector 41, and then grounded, and the other end of the thirteenth resistor R13 is connected to the other end of the fifth capacitor C5 and then connected to the positive input terminal v+ of the third operational amplifier 43.
Specifically, the first photodetector 41 is configured to receive natural light and an optical signal generated by the light emitting diode transmitted by the optical fiber 3 and convert the optical signal into a current signal, the first phase lead correction module 42 formed by the other end of the thirteenth resistor R13 and the fifth capacitor C5 is configured to perform phase lead correction to offset phase lag caused by capacitors distributed throughout the circuit, the photocurrent output by the third operational amplifier 43 can be changed by changing the resistance of the second adjusting resistor R02, the second adjusting resistor R02 can be adjusted to a suitable fixed value according to actual requirements before the circuit of the present utility model is applied, and the third operational amplifier 43 can employ the LF358.
The second light detection module 6 includes a second light detector 61, a second phase lead correction module 62, a fourth operational amplifier 63, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a fourth capacitor C4.
Preferably, the positive electrode of the second photodetector 61 is connected to the negative input terminal IN-of the fourth operational amplifier 63, the negative electrode of the second photodetector 61 is connected to one end of the second phase lead correction module 62 and then to the ground GND, the other end of the second phase lead correction module 62 is connected to the positive input terminal in+ of the fourth operational amplifier 63, the positive voltage input terminal v+ of the fourth operational amplifier 63 is connected to the power supply VCC, and the negative voltage input terminal V-of the fourth operational amplifier 63 is grounded GND.
One end of the tenth resistor R10 is connected to one end of the fourth capacitor C4 and then to the negative input terminal IN-of the fourth operational amplifier 63, and the other end of the tenth resistor R10 is connected to the other end of the fourth capacitor C4 and then to the output terminal of the fourth operational amplifier 63 and one end of the eleventh resistor R11, respectively.
The other end of the eleventh resistor R11 is connected to one end of the twelfth resistor R12 and the negative input terminal IN-of the ultralow offset voltage operational amplifier 7, respectively, and the other end of the twelfth resistor R12 is connected to the output terminal of the ultralow offset voltage operational amplifier 7.
The second phase lead correction module 62 includes a fourteenth resistor R14 and a sixth capacitor C6, where one end of the fourteenth resistor R14 is connected to one end of the sixth capacitor C6 and then connected to the negative electrode of the second photodetector 61, and the other end of the fourteenth resistor R14 is connected to the other end of the sixth capacitor C6 and then connected to the positive input terminal v+ of the fourth operational amplifier 63.
Specifically, the second photodetector 61 is configured to receive natural light and convert the natural light into a current signal, the second phase lead correction module 62 formed by the fourteenth resistor R14 and the sixth capacitor C6 is configured to perform phase lead correction to offset phase lag caused by capacitors distributed throughout the circuit, and the fourth operational amplifier 63 may employ the LF358.
In one embodiment of the present utility model, the first photodetector 41 and the second photodetector 61 may each employ a PIN photodetector, wherein the PIN photodetector core is a PN junction formed of P-type and N-type semiconductor materials, and when the semiconductor materials absorb light energy, a volt effect is generated on the PN junction to convert the light signal into an electrical signal.
In the utility model, the two input ends of the ultralow offset voltage operational amplifier respectively receive the electric signals transmitted by the first optical detection module and the second optical detection module to form a differential operational amplifier effect, and the ultralow offset voltage operational amplifier can be used for eliminating common mode signals between the first optical detection module and the second optical detection module, namely eliminating the influence of natural light on optical signals transmitted by optical fibers.
As shown in fig. 3, the battery pack temperature detection circuit further includes a fifth operational amplifier 8, a fifteenth resistor R15, a sixteenth resistor R16, and a third adjusting resistor R03, where the fifth operational amplifier 8, the fifteenth resistor R15, the sixteenth resistor R16, and the third adjusting resistor R03 together complete the second-stage amplification of the electric signal output from the ultralow offset voltage operational amplifier 7.
One end of a fifteenth resistor R15 is connected with the output end of the ultralow offset voltage operational amplifier 7, the other end of the fifteenth resistor R15 is connected with the positive input end IN+ of the fifth operational amplifier 8, the negative input end IN-of the fifth operational amplifier 8 is respectively connected with one end of a sixteenth resistor R16 and one end of a third regulating resistor R03, the other end of the sixteenth resistor R16 is grounded GND, and the output end of the fifth operational amplifier 8 is respectively connected with the other end of the third regulating resistor R03 and the controller 5;
the positive voltage input v+ of the fifth operational amplifier 8 is connected to the power supply VCC, and the negative voltage input V-ground GND of the fifth operational amplifier 8.
The fifth operational amplifier 8 can adopt an AD-OP07 to form a two-stage amplifying circuit with the ultra-low offset voltage operational amplifier 7, and the third adjusting resistor R03 is used for adjusting the electric signal output by the fifth operational amplifier 8 finally by the adjusting circuit and can be adjusted to a fixed value before the utility model is applied.
In the present utility model, as shown in fig. 3, a power supply VCC sequentially performs amplification processing by a first operational amplifier 121 and a second operational amplifier 122 to obtain an amplified driving signal, and the driving signal is transmitted to a light emitting diode LED through modulation of driving power by a first triode DIO1 and a second triode DIO2 to drive the light emitting diode LED to emit light to generate an optical signal.
The first light detector 41 receives the light signal and natural light generated by the light emitting diode LED through the optical fiber 3 and converts the light signal and natural light into an electrical signal, meanwhile the second light detector 61 receives the natural light and generates a corresponding electrical signal, the electrical signal generated by the first light detector 41 is transmitted to the ultra-low offset voltage operational amplifier 7 through the third operational amplifier 43, and the electrical signal generated by the second light detector 61 is transmitted to the ultra-low offset voltage operational amplifier 7 through the fourth operational amplifier 63.
The ultralow offset voltage operational amplifier 7 performs differential modulation on the two received electrical signals, eliminates the electrical signal corresponding to the natural light part in the electrical signal generated by the first optical detector 41, outputs the differential electrical signal through the output end of the ultralow offset voltage operational amplifier 7, and transmits the differential electrical signal to the fifth operational amplifier 8 for secondary amplification, and transmits the amplified signal to the controller.
Because the electrical signal obtained by the conversion of the optical detector and the light intensity of the light signal generated by the light emitting diode are in a direct proportion relation, and the optical fiber 3 is arranged in the battery pack and is influenced by the change of the environment temperature in the battery pack, the size or refractive index of the optical fiber 3 can be changed along with the temperature, so that the light intensity of the light signal transmitted by the optical fiber 3 is in a direct proportion relation with the temperature, the light signal received by the first optical detector is changed along with the temperature of the battery pack, the electrical signal generated by the first optical detector is changed along with the temperature, and the controller can determine the current generated by the light emitting diode through the relation between the elements in the battery pack temperature detection circuit and the element model value, and further determine the temperature in the battery pack through the direct proportion relation between the current generated by the light emitting diode and the light intensity and the direct proportion relation between the light intensity and the temperature, that is said is, that is, the change of the light intensity formed by the optical fiber transmitted by the output electrical signal can be known under the temperature influence, so that the change of the temperature can be known, and the temperature is monitored.
That is, the present utility model is advantageous in that:
the photoelectric conversion technology is utilized to measure and monitor the temperature of the battery core in the battery pack of the new energy automobile in real time, replaces the original NTC temperature-sensitive resistor, avoids a series of defects generated by the temperature measurement of the NTC temperature-sensitive resistor, and improves the durability, the anti-interference capability, the sensitivity, the stability and the accuracy of the BMS temperature sensor.
The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (10)
1. A battery pack temperature detection circuit is characterized by comprising a driving module, a light emitting module, an optical fiber, a first light detection module and a controller, wherein the optical fiber is arranged inside a battery pack,
the driving module is connected with the light-emitting module, and the light-emitting module and the driving module are also connected with a power supply;
the input end of the optical fiber is coupled with the light emitting module, and the output end of the optical fiber is coupled with the first light detection module;
the first light detection module is also connected with the controller.
2. The battery pack temperature detection circuit according to claim 1, wherein the driving module comprises a voltage stabilizing and anti-reflection circuit, an operational amplification module and a power enhancement module,
the voltage stabilizing anti-reverse circuit is respectively connected with a power supply and the input end of the operational amplification module, the output end of the operational amplification module is connected with the input end of the power enhancement module, the first output end of the power enhancement module is connected with the light-emitting module, and the second output end of the power enhancement module is grounded.
3. The battery pack temperature detection circuit of claim 2, wherein the voltage stabilizing and anti-reflection circuit comprises a first resistor, a second resistor, a first capacitor and an anti-reflection diode, the operational amplification module comprises a first operational amplifier, a second operational amplifier, a third resistor, a fourth resistor and a first adjusting resistor,
one end of the first resistor is connected with the power supply, the other end of the first resistor is respectively connected with the positive input end of the first operational amplifier, one end of the second resistor, one end of the first capacitor and the negative electrode of the anti-reflection diode, and the other end of the second resistor is grounded after being connected with the other end of the first capacitor and the positive electrode of the anti-reflection diode;
the negative input end of the first operational amplifier is connected with one end of the first adjusting resistor, the positive power input end of the first operational amplifier is connected with the power supply, the other end of the first adjusting resistor is grounded with the negative power input end of the first operational amplifier, the output end of the first operational amplifier is respectively connected with one end of the third resistor and the positive input end of the second operational amplifier, and the other end of the third resistor is connected with one end of the first adjusting resistor;
the negative input end of the second operational amplifier is connected with the power enhancement module, the positive power input end of the second operational amplifier is connected with the power supply, the negative power input end of the second operational amplifier is grounded, the output end of the second operational amplifier is connected with one end of the fourth resistor, and the other end of the fourth resistor is connected with the power enhancement module.
4. The battery pack temperature detection circuit of claim 3, wherein the power boost module comprises a first transistor, a second transistor, a fifth resistor, and a second capacitor,
the base electrode of the first triode is connected with the other end of the fourth resistor, and the emitter electrode of the first triode is respectively connected with the base electrode of the second triode and the negative input end of the second operational amplifier;
the collector of the first triode and the collector of the second triode are connected with one end of the light-emitting module, the emitter of the second triode is respectively connected with one end of the fifth resistor and one end of the second capacitor, and the other end of the fifth resistor is connected with the other end of the second capacitor and then grounded.
5. The battery pack temperature detection circuit of claim 4, wherein the light emitting module comprises a light emitting diode and a sixth resistor,
one end of the sixth resistor is connected with the power supply, the other end of the sixth resistor is connected with the positive electrode of the light emitting diode, and the negative electrode of the light emitting diode is respectively connected with the collector electrode of the first triode and the collector electrode of the second triode;
the light emitting diode is also coupled to one end of the optical fiber.
6. The battery pack temperature detection circuit of claim 1, further comprising a second photo detection module and an ultra low offset voltage operational amplifier,
the first optical detection module is connected with the positive input end of the ultralow offset voltage operational amplifier, the second optical detection module is connected with the negative input end of the ultralow offset voltage operational amplifier, the positive input end of the power supply of the ultralow offset voltage operational amplifier is connected with the power supply, and the negative voltage input end of the ultralow offset voltage operational amplifier is grounded;
and the output end of the ultralow offset voltage operational amplifier is connected with the controller.
7. The battery pack temperature detection circuit of claim 6, wherein the first light detection module comprises a first light detector, a first phase lead correction module, a third operational amplifier, a seventh resistor, an eighth resistor, a ninth resistor, a second adjustment resistor, and a third capacitor,
the positive electrode of the first optical detector is connected with the negative input end of the third operational amplifier, the negative electrode of the first optical detector is connected with one end of the first phase lead correction module and then grounded, the other end of the first phase lead correction module is connected with the positive input end of the third operational amplifier, the positive voltage input end of the third operational amplifier is connected with a power supply, the negative voltage input end of the third operational amplifier is grounded, and the first optical detector is further coupled with the other end of the optical fiber;
the output end of the third operational amplifier is respectively connected with one end of the seventh resistor and one end of the second regulating resistor, the other end of the seventh resistor is respectively connected with one end of the eighth resistor and the positive input end of the ultralow offset voltage operational amplifier, and the other end of the eighth resistor is grounded;
one end of the ninth resistor is connected with one end of the third capacitor and then connected with the negative input end of the third operational amplifier, and the other end of the ninth resistor is connected with the other end of the third capacitor and then connected with the other end of the second regulating resistor.
8. The battery pack temperature detection circuit of claim 6, wherein the second light detection module comprises a second light detector, a second phase lead correction module, a fourth operational amplifier, a tenth resistor, an eleventh resistor, a twelfth resistor, and a fourth capacitor,
the positive electrode of the second optical detector is connected with the negative input end of the fourth operational amplifier, the negative electrode of the second optical detector is connected with one end of the second phase lead correction module and then grounded, the other end of the second phase lead correction module is connected with the positive input end of the fourth operational amplifier, the positive voltage input end of the fourth operational amplifier is connected with a power supply, and the negative voltage input end of the fourth operational amplifier is grounded;
one end of the tenth resistor is connected with one end of the fourth capacitor and then connected with the negative input end of the fourth operational amplifier, and the other end of the tenth resistor is connected with the other end of the fourth capacitor and then connected with the output end of the fourth operational amplifier and one end of the eleventh resistor respectively;
the other end of the eleventh resistor is connected with one end of the twelfth resistor and the negative input end of the ultralow offset voltage operational amplifier respectively, and the other end of the twelfth resistor is connected with the output end of the ultralow offset voltage operational amplifier.
9. The battery pack temperature detection circuit of claim 8, wherein the first phase lead correction module of the first light detection module further comprises a thirteenth resistor and a fifth capacitor, the second phase lead correction module comprises a fourteenth resistor and a sixth capacitor,
one end of the thirteenth resistor is connected with one end of the fifth capacitor and then connected with the negative electrode of the first light detector in the first light detection module, and the other end of the thirteenth resistor is connected with the other end of the fifth capacitor and then connected with the positive input end of the third operational amplifier;
one end of the fourteenth resistor is connected with one end of the sixth capacitor and then connected with the negative electrode of the second optical detector, and the other end of the fourteenth resistor is connected with the other end of the sixth capacitor and then connected with the positive input end of the fourth operational amplifier.
10. The battery pack temperature detection circuit of claim 6, further comprising a fifth operational amplifier, a fifteenth resistor, a sixteenth resistor, and a third conditioning resistor,
wherein one end of the fifteenth resistor is connected with the output end of the ultralow offset voltage operational amplifier, the other end of the fifteenth resistor is connected with the positive input end of the fifth operational amplifier, the negative input end of the fifth operational amplifier is respectively connected with one end of the sixteenth resistor and one end of the third regulating resistor, the positive voltage input end of the fifth operational amplifier is connected with the power supply, the negative voltage input end of the fifth operational amplifier is grounded,
the other end of the sixteenth resistor is grounded, and the output end of the fifth operational amplifier is respectively connected with the other end of the third adjusting resistor and the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321604978.XU CN220136518U (en) | 2023-06-21 | 2023-06-21 | Battery pack temperature detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321604978.XU CN220136518U (en) | 2023-06-21 | 2023-06-21 | Battery pack temperature detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220136518U true CN220136518U (en) | 2023-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321604978.XU Active CN220136518U (en) | 2023-06-21 | 2023-06-21 | Battery pack temperature detection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN220136518U (en) |
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2023
- 2023-06-21 CN CN202321604978.XU patent/CN220136518U/en active Active
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