CN218994558U - Battery temperature sampling circuit and electronic equipment - Google Patents
Battery temperature sampling circuit and electronic equipment Download PDFInfo
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- CN218994558U CN218994558U CN202223557729.8U CN202223557729U CN218994558U CN 218994558 U CN218994558 U CN 218994558U CN 202223557729 U CN202223557729 U CN 202223557729U CN 218994558 U CN218994558 U CN 218994558U
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Abstract
In the battery temperature sampling circuit, a temperature sampling module is respectively connected with a battery, a charging controller and a ground terminal, and a temperature compensation module is respectively connected with the battery, the charging controller and the ground terminal, so that the temperature sampling module obtains a first sampling voltage at the output terminal of the battery and sends the first sampling voltage to the charging controller; the temperature compensation module obtains a second sampling voltage between the output end and the ground end of the battery, and sends the second sampling voltage to the charging controller so that the charging controller can determine the current temperature of the battery after removing the second sampling voltage from the first sampling voltage. Compared with the prior art, the method and the device have the advantages that the current temperature of the battery is obtained by removing the second sampling voltage in the first sampling voltage, the influence of floating pressure between the output end and the ground end of the battery can be eliminated, and the temperature of the current battery is truly reflected.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery temperature sampling circuit and electronic equipment.
Background
With popularization of civil electronic products, charging technology is very different day by day, and high-current charging is already a bright spot of the electronic products. At different temperatures, the charging strategies of the lithium battery are also different, such as low temperature conditions, and the charging current needs to be reduced; if the temperature of the battery cell is too high, the charging protection battery cell is stopped in advance. To obtain the temperature of the battery cell, a temperature detection circuit is generally added to the related circuit of the battery, for example, a negative temperature coefficient (Negative Temperature Coefficient, NTC) circuit is added to the temperature detection circuit, and the temperature of the battery is monitored by detecting the voltage change through an analog-to-digital converter (Analog to Digital Converter, ADC). The accuracy of the NTC detection temperature is closely related to the charging strategy, and plays a vital role in battery safety and life.
For example, in order to obtain the battery temperature, an NTC resistor is usually connected in parallel to the output end of the battery, and the NTC resistor is placed around the battery, and is connected to the charging controller. The charging controller charges the battery, the ADC detects the NTC terminal voltage, and then the charging controller gives the current temperature according to the voltage table. However, in the actual process, because the battery and the charging controller are two independent units, for example, the battery and the charging controller are located on two circuit boards, when a technician installs the two units, the circuit board where the battery is located is usually welded on the circuit board where the charging controller is located, so that certain impedance exists between the circuit board where the battery is located and the circuit board where the charging controller is located, for example, the board-to-board contact impedance or the impedance of the circuit board where the battery is located, and the like, due to the existence of the impedance between the two circuit boards during charging and discharging, the ADC sampling voltage is higher than the actual value during heavy current charging, and the ADC sampling value jumps and is lower than the actual temperature at the moment of inserting the charger. And the discharge scene is opposite, and the temperature is higher than the actual temperature when large current is discharged.
Disclosure of Invention
The embodiment of the application discloses a battery temperature sampling circuit and electronic equipment, which are used for eliminating the influence of floating pressure between the output end and the ground end of a battery and truly reflecting the temperature of the current battery.
In a first aspect, the present application provides a battery temperature sampling circuit, applied to electronic equipment, electronic equipment still includes charge controller and battery, charge controller with the battery is connected, the circuit includes temperature sampling module and temperature compensation module, temperature sampling module respectively with the battery with charge controller is connected, temperature compensation module respectively with temperature sampling module charge controller and ground connection, wherein: the temperature sampling module is used for obtaining a first sampling voltage at the output end of the battery at the current temperature of the battery and sending the first sampling voltage to the charging controller, wherein the first sampling voltage comprises a voltage between the output end of the battery and the ground end; the temperature compensation module is configured to obtain a second sampling voltage between the output end of the battery and the ground end, and send the second sampling voltage to the charge controller, so that the charge controller determines the current temperature of the battery after removing the second sampling voltage from the first sampling voltage.
In one embodiment, the temperature compensation module includes a first analog-to-digital converter and a voltage detector, the voltage detector is respectively connected with the output end of the battery and the first analog-to-digital converter, and the first analog-to-digital converter is also connected with the charging controller; the voltage detector is used for collecting a first voltage parameter between the output end of the battery and the ground end; the first analog-to-digital converter is configured to convert the first voltage parameter into the second sampled voltage, and send the second sampled voltage to the charge controller, so that the charge controller determines a voltage difference between an output end of the battery and the ground end according to the second sampled voltage.
In one embodiment, the voltage detector includes a first resistor and a second resistor, the first resistor is connected to the output end of the battery and the first analog-to-digital converter, respectively, and the second resistor is connected to the first analog-to-digital converter and the ground, respectively.
In one embodiment, the voltage detector further includes a capacitor, and the capacitor is connected to the second resistor and the ground terminal respectively.
In one embodiment, the temperature sampling module includes a second analog-to-digital converter and a temperature detector, the temperature detector is respectively connected with the output end of the battery and the second analog-to-digital converter, and the second analog-to-digital converter is also connected with the charging controller; the temperature detector is used for acquiring a second voltage parameter at the output end of the battery at the current temperature of the battery; the second analog-to-digital converter is used for converting the second voltage parameter into the first sampling voltage and sending the first sampling voltage to the charging controller so that the charging controller can determine the current temperature of the battery according to the first sampling voltage and the pressure difference between the output end of the battery and the ground end.
In one embodiment, the temperature detector includes a thermistor and a third resistor, the thermistor is respectively connected with the output end of the battery and the second analog-to-digital converter, and the third resistor is respectively connected with the second analog-to-digital converter and the ground end.
In a second aspect, the application provides an electronic device, the electronic device includes a main board and a battery protection board, the main board includes a charge controller, the battery protection board includes a battery, the charge controller with the battery is connected, the electronic device still includes above-mentioned battery temperature sampling circuit, the circuit respectively with the battery with the charge controller is connected.
In one embodiment, the battery temperature sampling circuit includes a first analog-to-digital converter and a second analog-to-digital converter, both of which are located on the motherboard.
In one embodiment, the battery temperature sampling circuit includes a first resistor and a third resistor, where the first resistor and the third resistor are both located on the battery protection board.
In one embodiment, the charging controller, the first analog-to-digital converter and the second analog-to-digital converter are all integrated on the same chip.
In the battery temperature sampling circuit and the electronic device, the temperature sampling module of the battery temperature sampling circuit is respectively connected with the battery and the charging controller, the temperature compensation module of the battery temperature sampling circuit is respectively connected with the temperature sampling module, the charging controller and the ground terminal, so that the temperature sampling module obtains a first sampling voltage at the output terminal of the battery, the first sampling voltage is sent to the charging controller, and the first sampling voltage comprises the voltage between the output terminal of the battery and the ground terminal; the temperature compensation module obtains a second sampling voltage between the output end and the ground end of the battery, and sends the second sampling voltage to the charging controller so that the charging controller can determine the current temperature of the battery after removing the second sampling voltage from the first sampling voltage. Compared with the prior art, the method and the device have the advantages that the current temperature of the battery is obtained after the second sampling voltage in the first sampling voltage is removed, the influence of floating pressure between the output end and the ground end of the battery can be eliminated, and the temperature of the current battery is truly reflected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a battery temperature sampling circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a battery temperature sampling circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a battery temperature sampling circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a battery temperature sampling circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a battery temperature sampling circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It should be noted that the terms "comprising" and "having" and any variations thereof in the embodiments and figures herein are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
A battery temperature sampling circuit provided herein may be applied in a chargeable electronic device, which may be a terminal or communication terminal including, but not limited to, a device configured to receive/transmit communication signals via a wireline connection, such as via a public-switched telephone network (public switched telephone network, PSTN), a digital subscriber line (digital subscriber line, DSL), a digital cable, a direct cable connection, and/or another data connection/network and/or via a wireless interface, for example, to a cellular network, a wireless local area network (wireless local area network, WLAN), a digital television network such as a digital video broadcasting handheld (digital video broadcasting handheld, DVB-H) network, a satellite network, an amplitude-modulation-frequency modulation (amplitude modulation-frequency modulation, AM-FM) broadcast transmitter, and/or another communication terminal. A communication terminal configured to communicate via a wireless interface may be referred to as a "wireless communication terminal," wireless terminal, "and/or" mobile terminal. Examples of mobile terminals include, but are not limited to, satellites or cellular telephones; a personal communications system (personal communication system, PCS) terminal that may combine a cellular radiotelephone with data processing, facsimile and data communications capabilities; personal digital assistants (Personal Digital Assistant, PDA) that may include a radiotelephone, pager, internet/intranet access, web browser, organizer, calendar, and/or a global positioning system (global positioning system, GPS) receiver; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. In addition, the terminal can further comprise, but is not limited to, chargeable electronic devices with charging functions, such as electronic book readers, intelligent wearable devices, mobile power sources (such as charger, travel charger), electronic cigarettes, wireless mice, wireless keyboards, wireless headphones, bluetooth sound boxes and the like.
Fig. 1 is a schematic structural diagram of a battery temperature sampling circuit according to an embodiment of the present application, as shown in fig. 1, the circuit is applied to the above electronic device, the electronic device includes a charge controller 11 and a battery 12, the charge controller 11 is connected with the battery 12, the circuit includes a temperature sampling module 131 and a temperature compensation module 132, the temperature sampling module 131 is respectively connected with the battery 12, the charge controller 11 and a ground terminal 14, and the temperature compensation module 132 is respectively connected with the battery, the charge controller 11 and the ground terminal 14.
A temperature sampling module 131 for obtaining a first sampling voltage at the output terminal of the battery 12 at the current temperature of the battery 12, and transmitting the first sampling voltage to the charge controller 11, the first sampling voltage including a voltage between the output terminal of the battery 12 and the ground terminal 14;
the temperature compensation module 132 is configured to obtain a second sampling voltage between the output terminal of the battery 12 and the ground terminal 14, and send the second sampling voltage to the charge controller 11, so that the charge controller 11 determines the current temperature of the battery 12 after removing the second sampling voltage from the first sampling voltage.
It should be understood that the first sampled voltage obtained by the temperature sampling module 131 is used to reflect the current temperature of the battery 12, that is, when the current temperature of the battery 12 changes, the first sampled voltage will also change, and the charging controller 11 may obtain the current temperature of the battery 12 according to the specific value of the first sampled voltage, but since there is a backflow impedance between the ground 14 of the circuit board where the battery 12 is located and the ground 14 of the circuit board where the charging controller 11 is located in the prior art, the current temperature obtained directly through the first sampled voltage is not accurate, and the accurate temperature of the battery 12 can be obtained only by calculating the first sampled voltage and the second sampled voltage together.
Alternatively, the battery 12 may include a battery cell, a protection controller, and a field effect transistor, where an output end of the charge controller 11 is connected to a positive electrode of the battery cell, a negative electrode of the battery cell is connected to a drain electrode of the field effect transistor, a control end of the protection controller is connected to a gate electrode of the field effect transistor, and a source electrode of the field effect transistor is connected to the ground end 14. The protection controller is used for sending a control signal to the field effect transistor; the field effect tube is used for receiving a control signal of the protection controller and disconnecting or connecting the output end of the battery cell.
Alternatively, the first sampled voltage and the second sampled voltage may be collected by the temperature sampling module 131 and the temperature compensation module 132 in real time, or may be collected by the temperature sampling module 131 and the temperature compensation module 132 after receiving the collection control signal. The above-mentioned collection control signal may be sent to the temperature sampling module 131 and the temperature compensation module 132 by a detection module connected to the temperature sampling module 131 and the temperature compensation module 132, for example, after the detection module receives a trigger signal indicating that the charger is plugged into the electronic device, the detection module sends the collection control signal to the temperature sampling module 131 and/or the temperature compensation module 132, and the temperature sampling module 131 and the temperature compensation module 132 start to collect the first sampling voltage and the second sampling voltage respectively after receiving the collection control signal.
In the above battery temperature sampling circuit, by connecting the temperature sampling module 131 of the battery temperature sampling circuit with the battery 12 and the charge controller 11, respectively, the temperature compensation module 132 of the battery temperature sampling circuit is connected with the temperature sampling module 131, the charge controller 11 and the ground 14, respectively, so that the temperature sampling module 131 obtains a first sampling voltage at the output end of the battery 12, and sends the first sampling voltage to the charge controller 11, where the first sampling voltage includes a voltage between the output end of the battery 12 and the ground 14; the temperature compensation module 132 obtains a second sampling voltage between the output terminal of the battery 12 and the ground terminal 14, and sends the second sampling voltage to the charge controller 11, so that the charge controller 11 determines the current temperature of the battery 12 after removing the second sampling voltage from the first sampling voltage. Compared with the prior art, the current temperature of the battery 12 is obtained by removing the second sampling voltage in the first sampling voltage, so that the influence of floating pressure between the output end of the battery 12 and the ground end 14 can be eliminated, and the current temperature of the battery 12 is truly reflected.
Fig. 2 is a schematic structural diagram of a battery temperature sampling circuit according to an embodiment of the present application, as shown in fig. 2, based on the circuit shown in fig. 1, the temperature compensation module 132 includes a first analog-to-digital converter 1322 and a voltage detector 1321, the voltage detector 1321 is respectively connected to an output end of the battery 12 and the first analog-to-digital converter 1322, and the first analog-to-digital converter 1322 is further connected to the charge controller 11.
A voltage detector 1321 for acquiring a first voltage parameter between the output terminal of the battery 12 and the ground terminal 14;
the first analog-to-digital converter 1322 is configured to convert the first voltage parameter into a second sampled voltage, and send the second sampled voltage to the charge controller 11, so that the charge controller 11 determines a voltage difference between the output terminal of the battery 12 and the ground terminal 14 according to the second sampled voltage.
Optionally, the voltage detector 1321 may be connected at any position between the output end of the battery 12 and the ground end 14, so as to collect the first voltage parameter between the output end of the battery 12 and the ground end 14, where the specific position is set by a person skilled in the art according to the actual situation, which is not limited in this application.
Optionally, the voltage detector 1321 may include a first resistor 13211 and a second resistor 13212, where the first resistor 13211 is connected to the output terminal of the battery 12, the second resistor 13212, and the first analog-to-digital converter 1322, and the second resistor 13212 is further connected to the first analog-to-digital converter 1322 and the ground terminal 14, respectively.
Illustratively, as shown in fig. 3, taking the first resistor 13211 as a resistor Rx and the second resistor 13212 as a resistor Rux as an example, the voltage detector 1321 includes a resistor Rx and a resistor Rux, the resistor Rx is respectively connected to the output terminal of the battery 12, the resistor Rux and the first analog-to-digital converter 1322, and the resistor Rux is also respectively connected to the first analog-to-digital converter 1322 and the ground terminal 14. After obtaining the second sampled voltage Vi2 of the first analog-to-digital converter 1322, the charge controller 11 may calculate the floating voltage VAB between the output end of the battery 12 and the ground end 14 according to the second sampled voltage Vi2, where the calculation formula is as follows:
where VT is the voltage output from the charge controller 11 to the battery 12.
Optionally, the voltage detector 1321 may further include a capacitor, where the capacitor is connected to the second resistor 13212 and the ground 14, respectively.
In the above battery temperature sampling circuit, a temperature compensation module 132 including a first analog-to-digital converter 1322 and a voltage detector 1321 is provided, so that the voltage detector 1321 collects a first voltage parameter between an output terminal of the battery 12 and the ground terminal 14; the first analog-to-digital converter 1322 converts the first voltage parameter into a second sampling voltage, and sends the second sampling voltage to the charge controller 11, so that the charge controller 11 can accurately calculate the voltage difference between the output terminal of the battery 12 and the ground terminal 14 according to the second sampling voltage.
Fig. 4 is a schematic structural diagram of a battery temperature sampling circuit according to an embodiment of the present application, as shown in fig. 4, based on the circuit shown in fig. 2, the temperature sampling module 131 includes a second analog-to-digital converter 1312 and a temperature detector 1311, the temperature detector 1311 is respectively connected to an output end of the battery 12 and the second analog-to-digital converter 1312, and the second analog-to-digital converter 1312 is further connected to the charging controller 11.
A temperature detector 1311 for acquiring a second voltage parameter at the output of the battery 12 at the current temperature of the battery 12;
the second analog-to-digital converter 1312 is configured to convert the second voltage parameter into a first sampling voltage, and send the first sampling voltage to the charge controller 11, so that the charge controller 11 determines the current temperature of the battery 12 according to the first sampling voltage and the voltage difference between the output terminal of the battery 12 and the ground terminal 14.
Alternatively, the temperature detector 1311 may be connected at any position between the output end of the battery 12 and the ground 14, so long as the second voltage parameter at the output end of the battery 12 can be acquired, and the specific position is set by a person skilled in the art according to the actual situation, which is not limited in this application.
Alternatively, the temperature detector 1311 may include a thermistor 13111 and a third resistor 13112, where the thermistor 13111 is connected to the output terminal of the battery 12 and the second analog-to-digital converter 1312, and the third resistor 13112 is connected to the second analog-to-digital converter 1312 and the ground terminal 14, respectively.
Illustratively, as shown in fig. 5, taking the thermistor 13111 as a thermistor RNTC and the third resistor 13112 as a resistor Ru as an example, the voltage detector 1321 includes the thermistor RNTC and the resistor Ru, where the thermistor RNTC is respectively connected to the output terminal of the battery 12, the resistor Ru and the second analog-to-digital converter 1312, and the resistor Ru is also respectively connected to the second analog-to-digital converter 1312 and the ground terminal 14. After obtaining the first sampling voltage Vi1 of the second analog-to-digital converter 1312, the charge controller 11 may calculate the current resistance of the thermistor RNTC according to the first sampling voltage Vi1 and the differential pressure VAB between the output end of the battery 12 and the ground end 14, and further obtain the current temperature T of the battery 12 corresponding to the current resistance of the thermistor RNTC by querying the preset correspondence between the resistance of the thermistor 13111 and the temperature. The calculation formula of the current resistance value of the thermistor RNTC may be:
where VT is the voltage output from the charge controller 11 to the battery 12.
Optionally, the temperature detector 1311 may further include a capacitor, where the capacitor is connected to the third resistor 13112 and the ground 14, respectively.
Alternatively, the capacitance in the temperature detector 1311 and the capacitance in the voltage detector 1321 may be the same capacitance or different capacitances, which are set by those skilled in the art according to the actual situation, and the present application is not limited.
In the above battery temperature sampling circuit, the temperature sampling module 131 including the second analog-to-digital converter 1312 and the temperature detector 1311 is provided, so that the temperature detector 1311 collects the second voltage parameter at the output end of the battery 12; the second analog-to-digital converter 1312 converts the second voltage parameter into a first sampling voltage and sends the first sampling voltage to the charge controller 11, so that the charge controller 11 can accurately calculate the current temperature of the battery 12 according to the first sampling voltage and the voltage difference between the output terminal of the battery 12 and the ground terminal 14.
Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application, as shown in fig. 6, the electronic device may include a main board 60 and a battery protection board 61, the main board 60 includes a charge controller 11 and a ground terminal 14, the battery protection board 61 includes a battery 12, the battery 12 is respectively connected with the ground terminal 14 and the charge controller 11, and the electronic device further includes a battery temperature sampling circuit shown in any of fig. 1 to 5, where the circuit is respectively connected with the battery 12 and the charge controller 11.
Optionally, the battery temperature sampling circuit includes a first analog-to-digital converter 1322 and a second analog-to-digital converter 1312, where the first analog-to-digital converter 1322 and the second analog-to-digital converter 1312 are located on the motherboard 60.
Optionally, the battery temperature sampling circuit includes a first resistor 13211 and a third resistor 13112, where the first resistor 13211 and the third resistor 13112 are located on the battery protection board 61.
Optionally, the charge controller 11, the first analog-to-digital converter 1322 and the second analog-to-digital converter 1312 are integrated on the same chip.
In the above electronic device, the current temperature of the battery 12 is determined by removing the second sampling voltage from the first sampling voltage after the charging controller 11 obtains the first sampling voltage and the second sampling voltage. Compared with the prior art, the method and the device can eliminate the influence of impedance between the battery protection plate 61 where the battery 12 is positioned and the main board 60 where the charging controller 11 is positioned, and truly reflect the current temperature of the battery 12.
Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application, where, as shown in fig. 7, the electronic device may include a charge control chip Charger IC, a battery module, a resistor R1, a resistor R2, a resistor R3, and a thermistor R NTC The charging control chip comprises a voltage output pin VOUT, a first sampling pin ADC1, a reference voltage pin VTREF and a second sampling pin ADC2; the Battery module comprises a Battery, a first field effect transistor DFET, a second field effect transistor CFET and a protection controller Protect IC.
The voltage output pin VOUT is connected with the positive electrode of the Battery cell, the negative electrode of the Battery cell is connected with the drain electrode of the first field effect tube DFET, the first control end of the protection controller protection IC is connected with the grid electrode of the first field effect tube DFET, the source electrode of the first field effect tube DFET is connected with the drain electrode of the second field effect tube CFET, the second control end of the protection controller protection IC is connected with the grid electrode of the second field effect tube CFET, the source electrode of the second field effect tube CFET is connected with one end of the resistor R3, and the other end of the resistor R3 is connected with the ground. The source electrode of the second field effect transistor CFET is also connected with the thermistor R NTC Is connected with one end of a thermistor R NTC The other end of the thermistor R is connected with a first sampling pin ADC1 NTC The other end of the resistor Ru is also connected with one end of the resistor Ru, and the other end of the resistor Ru is respectively connected with the ground end and the reference voltage pin VTREF. The source of the second field effect transistor CFET is also connected with one end of a resistor Rx, the other end of the resistor Rx is connected with a second sampling pin ADC2, the other end of the resistor Rx is also connected with a resistor Rux, and the other end of the resistor Rux is respectively connected with a ground end and a reference voltage pin VTREF. Ground and resistor RAnd a capacitor is also connected between the resistor Rux and the x.
After obtaining the second sampling voltage Vi2 of the second sampling pin ADC2, the charge control chip charge IC may calculate the floating voltage VAB between the source and the ground of the second field effect transistor CFET according to the second sampling voltage Vi2, where the calculation formula is as follows:
after the charge control chip Charger IC obtains the first sampling voltage Vi1 of the first sampling pin ADC1, the thermistor R can be obtained by calculation through the first sampling voltage Vi1 and the VAB NTC Further obtaining the thermistor R by inquiring the corresponding relation between the preset thermistor resistance and the temperature NTC The current temperature T of the battery corresponding to the current resistance value of (a). Thermistor R NTC The calculation formula of the current resistance value of (2) can be:
further, it can be seen that:
that is, rntc is changed to be constant only with respect to the first sampling voltage Vi1 of the first sampling pin ADC1 and the second sampling voltage Vi2 of the second sampling pin ADC2, so that the temperature of the current battery cell can be accurately calculated.
In the description of embodiments of the present utility model, a description of reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present specification. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
It will be appreciated that references herein to the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are intended to be based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In addition, each functional unit in each embodiment of the present specification may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The foregoing description of the preferred embodiments is provided for the purpose of illustration only, and is not intended to limit the scope of the disclosure, since any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the disclosure are intended to be included within the scope of the disclosure.
Claims (10)
1. The utility model provides a battery temperature sampling circuit, its characterized in that is applied to electronic equipment, electronic equipment still includes charge controller and battery, charge controller with the battery is connected, the circuit includes temperature sampling module and temperature compensation module, temperature sampling module respectively with the battery charge controller and ground terminal are connected, temperature compensation module respectively with the battery charge controller and ground terminal are connected, wherein:
the temperature sampling module is used for obtaining a first sampling voltage at the output end of the battery at the current temperature of the battery and sending the first sampling voltage to the charging controller, wherein the first sampling voltage comprises a voltage between the output end of the battery and the ground end;
the temperature compensation module is configured to obtain a second sampling voltage between the output end of the battery and the ground end, and send the second sampling voltage to the charge controller, so that the charge controller determines the current temperature of the battery after removing the second sampling voltage from the first sampling voltage.
2. The circuit of claim 1, wherein the temperature compensation module comprises a first analog-to-digital converter and a voltage detector, the voltage detector being connected to the output of the battery and the first analog-to-digital converter, respectively, the first analog-to-digital converter being further connected to the charge controller;
the voltage detector is used for collecting a first voltage parameter between the output end of the battery and the ground end;
the first analog-to-digital converter is configured to convert the first voltage parameter into the second sampled voltage, and send the second sampled voltage to the charge controller, so that the charge controller determines a voltage difference between an output end of the battery and the ground end according to the second sampled voltage.
3. The circuit of claim 2, wherein the voltage detector comprises a first resistor and a second resistor, the first resistor being connected to the output of the battery and the first analog-to-digital converter, respectively, and the second resistor being connected to the first analog-to-digital converter and ground, respectively.
4. The circuit of claim 3, wherein the voltage detector further comprises a capacitor connected to the second resistor and the ground, respectively.
5. The circuit of claim 2, wherein the temperature sampling module comprises a second analog-to-digital converter and a temperature detector, the temperature detector being connected to the output of the battery and the second analog-to-digital converter, respectively, the second analog-to-digital converter being further connected to the charge controller;
the temperature detector is used for acquiring a second voltage parameter at the output end of the battery at the current temperature of the battery;
the second analog-to-digital converter is used for converting the second voltage parameter into the first sampling voltage and sending the first sampling voltage to the charging controller so that the charging controller can determine the current temperature of the battery according to the first sampling voltage and the pressure difference between the output end of the battery and the ground end.
6. The circuit of claim 5, wherein the temperature detector comprises a thermistor and a third resistor, the thermistor being coupled to the output of the battery and the second analog-to-digital converter, respectively, and the third resistor being coupled to the second analog-to-digital converter and ground, respectively.
7. An electronic device, characterized in that the electronic device comprises a main board and a battery protection board, the main board comprises a charging controller, the battery protection board comprises a battery, the battery is connected with the charging controller, the electronic device further comprises a battery temperature sampling circuit according to any one of claims 1-6, and the circuit is respectively connected with the battery and the charging controller.
8. The electronic device of claim 7, wherein the battery temperature sampling circuit comprises a first analog-to-digital converter and a second analog-to-digital converter, the first analog-to-digital converter and the second analog-to-digital converter each located on the motherboard.
9. The electronic device of claim 7, wherein the battery temperature sampling circuit comprises a first resistor and a third resistor, the first resistor and the third resistor both located on the battery protection plate.
10. The electronic device of claim 8, wherein the charge controller, the first analog-to-digital converter, and the second analog-to-digital converter are all integrated on a same chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223557729.8U CN218994558U (en) | 2022-12-27 | 2022-12-27 | Battery temperature sampling circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223557729.8U CN218994558U (en) | 2022-12-27 | 2022-12-27 | Battery temperature sampling circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN218994558U true CN218994558U (en) | 2023-05-09 |
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| CN202223557729.8U Active CN218994558U (en) | 2022-12-27 | 2022-12-27 | Battery temperature sampling circuit and electronic equipment |
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