CN216696605U - Battery temperature detection circuit - Google Patents
Battery temperature detection circuit Download PDFInfo
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- CN216696605U CN216696605U CN202122704443.7U CN202122704443U CN216696605U CN 216696605 U CN216696605 U CN 216696605U CN 202122704443 U CN202122704443 U CN 202122704443U CN 216696605 U CN216696605 U CN 216696605U
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Abstract
The utility model discloses a battery temperature detection circuit, comprising: the temperature detection unit is positioned on the battery, and the first voltage division unit and the main control chip are positioned on the mainboard; the temperature detection unit is used for detecting the temperature of the battery and outputting a detection signal to the main control chip through the first voltage division unit, the temperature detection unit is respectively connected with the first voltage division unit and the main control chip through connectors, and the first voltage division unit is connected with the main control chip; the temperature detection unit is connected with the grounding end of the mainboard through the connector. The temperature detection unit outputs detection signals to the main control chip through the first voltage division unit, the main control chip correspondingly obtains the temperature of the battery according to the detection signals, the temperature detection unit is connected with the grounding end of the mainboard through the connector, the grounding end of the mainboard is used as a reference ground in the detection loop, the level is 0V all the time, the influence of extra impedance in the battery on the detection result is avoided, and therefore the detection accuracy is improved.
Description
Technical Field
The utility model relates to the technical field of battery detection, in particular to a battery temperature detection circuit.
Background
With the continuous development of the electronic industry, mobile terminals have become a main tool for people to communicate and undertake part of productivity. The temperature of the battery of the mobile terminal is particularly important for detecting the temperature of the battery because the battery is heated during the use of the mobile terminal, which causes the stability of the mobile terminal to be reduced.
At present, the detection method of the battery in the mobile terminal is that a main control chip on a mainboard determines the resistance value of a thermistor on the battery by receiving a voltage signal of a temperature detection loop, and then the temperature of the battery is obtained correspondingly according to the resistance value of the thermistor and a temperature relation table. However, in the prior art, the thermistor is grounded through the battery protection board, because the wiring impedance of the battery protection board and the contact impedance of the thermistor and the connector exist in the detection loop, the reference ground level of the thermistor is not 0V, and the battery temperature correspondingly obtained by the main control chip according to the voltage signal is based on the condition that the reference ground level of the thermistor is 0V, so that a large error exists between the detected temperature and the actual temperature of the battery.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the utility model provides a battery temperature detection circuit to there is the line impedance of walking of protection shield and the contact impedance of connector in solving because of detecting the return circuit, there is the problem of great error in detection temperature and actual temperature.
In order to solve the technical problems, the utility model adopts the technical scheme that:
a battery temperature detection circuit comprising: the temperature detection unit is positioned on the battery, and the first voltage division unit and the main control chip are positioned on the mainboard;
the temperature detection unit is used for detecting the temperature of the battery and outputting a detection signal to the main control chip through the first voltage division unit, the temperature detection unit is respectively connected with the first voltage division unit and the main control chip through connectors, and the first voltage division unit is connected with the main control chip;
the temperature detection unit is connected with the grounding end of the mainboard through the connector.
Further, the connector includes:
one end of the temperature detection pin is connected with the temperature detection unit, and the other end of the temperature detection pin is respectively connected with the first voltage division unit and the main control chip;
and one end of the grounding pin is connected with the temperature detection pin, and the other end of the grounding pin is connected with the grounding end of the mainboard.
Further, the temperature detection unit comprises a thermistor, and the thermistor is respectively connected with the temperature detection pin and the grounding pin.
Furthermore, the first voltage division unit comprises a first resistor, one end of the first resistor is connected with the first power supply terminal, and the other end of the first resistor is connected with the temperature detection pin and the main control chip respectively.
Furthermore, the battery voltage divider also comprises an identification unit positioned on the battery and a second voltage dividing unit positioned on the mainboard;
the identification unit is used for outputting an identification signal to the main control chip through the second voltage division unit, the connector is respectively connected with the identification unit and the second voltage division unit, and the second voltage division unit is connected with the main control chip;
the identification unit is connected with the grounding end of the mainboard through the connector.
Furthermore, the connector further comprises an identification pin, one end of the identification pin is connected with the identification unit, and the other end of the identification pin is respectively connected with the second voltage division unit and the main control chip.
Further, the identification unit comprises a second resistor, and the second resistor is respectively connected with the identification pin and the grounding pin.
Furthermore, the second voltage division unit comprises a third resistor, one end of the third resistor is connected with the second power supply terminal, and the other end of the third resistor is connected with the identification pin and the main control chip respectively.
Further, the connector further includes:
the positive electrode pin is respectively connected with the positive electrode of the battery and the power supply input end of the mainboard;
and the negative electrode pin is respectively connected with the negative electrode of the battery and the grounding end of the mainboard.
Further, the thermistor is an NTC thermistor.
The utility model has the beneficial effects that: compared with the prior art, the temperature detection unit outputs the detection signal to the main control chip through the first voltage division unit, the main control chip correspondingly obtains the battery temperature according to the detection signal, the temperature detection unit is connected with the grounding end of the mainboard through the connector, the grounding end of the mainboard is used as a reference ground in the detection loop, the level is always 0V, the influence of extra impedance in the battery on the detection result is avoided, and therefore the detection accuracy is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art battery temperature sensing circuit;
FIG. 2 is a schematic block diagram of a battery temperature detection circuit according to an embodiment of the present invention;
FIG. 3 is another schematic block diagram of a battery temperature detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a battery temperature detection circuit according to an embodiment of the present invention.
Description of reference numerals:
100. a battery; 110. a temperature detection unit; 120. an identification unit; 200. a main board; 210. a first voltage division unit; 220. a main control chip; 230. a second voltage division unit; 300. a connector is provided.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 2 to 4, an embodiment of the present invention is: a battery temperature detection circuit is used for detecting the battery temperature of a mobile terminal.
Referring to fig. 1, a batteryThe positive electrode P +, the negative electrode P-, the third resistor R3, and the thermistor R4 are connected to the main board 200 of the mobile terminal through the connector 300. The thermistor R4 is an NTC (negative temperature coefficient) thermistor, the negative electrode P-of the battery is connected to the ground terminal of the motherboard 200 through the connector 300 and the battery protection board, the contact impedance of the connector 300 and the routing impedance of the power protection board are identified by an additional impedance R5, which is about 20m Ω, the motherboard 200 is provided with a first resistor R1 connected to the thermistor R4 through the connector 300 and a second resistor R2 connected to the third resistor R3, and the level of the motherboard ground terminal is always 0V. Since the reference ground of the thermistor R4 is the ground (point a) of the battery protection board, the voltage at point a dynamically changes with the magnitude of the charge and discharge current during charge and discharge. Illustratively, for a fast 6A current, the level V of the reference ground of the thermistor R4 is setAIs composed of
VA＝R5*I5＝0.02Ω*6A＝0.12V
The pull-up power supply of the thermistor R4 is VIO _1, the input voltage is 2.8V, and the resistance value of the first resistor R1 is 24k omega. Assuming that the actual temperature of the battery is 45 ℃, the reference resistance value of the thermistor R4 is 4.911 Komega according to the resistance value of the thermistor R4 and the temperature relation table, and the level of the detection signal TH _ ADC received by the main control chip is 4.911 Komega
The main control chip calculates according to the level of the detection signal TH _ ADC, the calculated resistance value of the thermistor R4 is recorded as R4 ', and the calculation result of R4' is
The corresponding battery temperature obtained by the main control chip according to the calculated resistance value R4' and the resistance value and temperature relation table of the thermistor is 37 ℃, and the difference of the actual temperature of the battery is 8 ℃, so that the error of the temperature detection result is large.
In order to solve the technical problems, the utility model adopts the technical scheme that: a battery temperature detection circuit is applied to temperature detection of a battery of a mobile terminal.
Referring to fig. 2 and 4, the battery temperature detecting circuit includes: a connector 300, a temperature detection unit 110 on the battery 100, and a first voltage division unit 210 and a main control chip 220 on the main board 200; the temperature detection unit 110 is configured to detect a temperature of the battery 100 and output a detection signal TH _ ADC to the main control chip 220 through the first voltage division unit 210, the temperature detection unit 110 is respectively connected to the first voltage division unit 210 and the main control chip 220 through a connector 300, and the first voltage division unit 210 is connected to the main control chip 220; the temperature detection unit 110 is connected to the ground of the main board 200 through the connector 300.
The working principle of the battery temperature detection circuit of the embodiment is as follows: the battery 100 passes through the mainboard 200 is connected to connector 300, promptly the temperature detection unit 110 connects first partial pressure unit 210, and the input voltage warp first partial pressure unit 210 partial pressure, later pass through behind the temperature detection unit 110 to the earthing terminal of mainboard 200, the temperature detection unit 110 to main control chip 220 exports detected signal TH _ ADC, main control chip 220 basis detected signal TH _ ADC and resistance temperature relation table derive the temperature of battery 100. In the whole detection loop, the ground terminal of the main board 200 is used as a reference ground, and the ground terminal level of the temperature detection unit 110 is always 0V, so that compared with the prior art, the detection loop is not affected by the contact impedance of the connector 300 and the wiring impedance of the battery protection board, thereby improving the accuracy of temperature detection.
Specifically, the connector 300 includes: one end of the temperature detection pin TH is connected to the temperature detection unit 110, and the other end of the temperature detection pin TH is connected to the first voltage division unit 210 and the main control chip 220, respectively; the temperature detection circuit comprises a grounding pin GND, wherein one end of the grounding pin GND is connected with the temperature detection pin TH, and the other end of the grounding pin GND is connected with the grounding end of the mainboard 200.
As can be understood, by providing the temperature detection pin TH, a communication channel dedicated to transmitting the detection signal TH _ ADC is formed between the temperature detection unit 110 and the main control chip 220; by providing the ground pin GND, the ground terminal of the temperature detection unit 110 is grounded with the ground terminal of the motherboard 200 as a reference ground, so as to avoid the contact impedance of the connector 300 and the wiring impedance of the battery protection board from affecting the detection result.
Specifically, the temperature detecting unit 110 includes a thermistor R4, and the thermistor R4 is connected to the temperature detecting pin TH and the ground pin GND, respectively. Further, the first voltage division unit 210 includes a first resistor R1, one end of the first resistor R1 is connected to the first power supply terminal, and the other end of the first resistor R1 is connected to the temperature detection pin TH and the main control chip 220, respectively. In this embodiment, the thermistor R4 is an NTC thermistor, and the resistance of the thermistor R4 decreases as the temperature of the battery 100 increases. For example, assuming that the temperature of the battery 100 is 45 ℃, the corresponding resistance value of the thermistor R4 is 4.911k Ω, the first power supply terminal VIO _1 is connected with an input voltage of 2.8V, the resistance value of the first resistor R1 is 24k Ω, the ground plane of the motherboard 200 is 0V, the level of the reference ground (point B) of the thermistor R4 is 0V, and the detection signal TH _ ADC received by the main control chip 220 has a value of 0V
The main control chip calculates according to the detection signal TH _ ADC to obtain a calculated resistance value R4' of the thermistor R4
Therefore, it can be seen that the calculated resistance value R4' of the thermistor R4 calculated by the main control chip 220 according to the detection signal TH _ ADC is equal to the actual resistance value, and the corresponding temperature value is consistent with the actual temperature of the battery 100.
Referring to fig. 1, in the battery temperature detection circuit of the prior art, a third resistor R3 is used to be connected to a main control chip 220 to identify an ID (Identity document) of a battery 100, and an identification signal ID _ ADC is output to the main control chip 220 after voltage division is performed by a second resistor R2, since a point a of the third resistor R3 is also selected as a reference ground and is affected by an extra impedance R5 in an identification loop, the main control chip 220 identifies error information according to the identification signal ID _ ADC, and normal charging and discharging of the battery 100 cannot be performed.
Referring to fig. 3 and 4, in order to solve the above problem, in the present embodiment, the battery temperature detection circuit further includes an identification unit 120 located on the battery 100 and a second voltage division unit 230 located on the motherboard 200; the identification unit 120 is configured to output an identification signal ID _ ADC to the main control chip 220 through the second voltage division unit 230, the connector 300 is respectively connected to the identification unit 120 and the second voltage division unit 230, and the second voltage division unit 230 is connected to the main control chip 220; the identification unit 120 is connected to the ground of the main board 200 through the connector 300.
It can be understood that the identification unit 120 is connected to the second voltage division unit 230, the input voltage is divided by the second voltage division unit 230, and then passes through the identification unit 120 and then reaches the ground terminal of the motherboard 200, the identification unit 120 outputs the identification signal ID _ ADC to the main control chip 220, and the main control chip 220 confirms the information and the on-site state of the battery 100 according to the identification signal ID _ ADC. In the entire identification loop, the ground terminal of the main board 200 is used as a reference ground, and the ground terminal level of the identification unit 120 is always 0V, so that compared with the prior art, the identification loop is not affected by the contact impedance of the connector 300 and the wiring impedance of the battery protection board, thereby preventing the main control chip 220 from identifying error information.
Specifically, the connector 300 further includes an identification pin ID, one end of the identification pin ID is connected to the identification unit 120, and the other end of the identification pin ID is respectively connected to the second voltage division unit 230 and the main control chip 220. Further, the identification unit 120 includes a second resistor R2, and the second resistor R2 is respectively connected to the identification pin ID and the ground pin GND. The second voltage dividing unit 230 includes a third resistor R3, one end of the third resistor R3 is connected to the second power supply terminal, and the other end of the third resistor R3 is connected to the identification pin ID and the main control chip 220, respectively.
In this embodiment, the second power supply terminal receives an input voltage, the input voltage is divided by the second resistor R2, then passes through the identification pin ID and the third resistor R3, and returns to the ground terminal of the motherboard 200 through the ground pin GND, so that the main control chip 220 is prevented from identifying wrong error information due to the fact that the identification signal ID _ ADC in the identification loop is affected by the additional impedance R5.
Specifically, the connector 300 further includes: a positive electrode pin P +, which is respectively connected to the positive electrode of the battery and the power supply input end VBATT of the motherboard 200; the negative pin P-is connected to the negative electrode of the battery and the ground terminal of the motherboard 200, respectively.
In summary, in the battery temperature detection circuit provided by the utility model, the temperature detection unit outputs a detection signal to the main control chip through the first voltage division unit, the identification unit outputs an identification signal to the main control chip through the second voltage division unit, the main control chip correspondingly obtains the battery temperature according to the detection signal and obtains the battery information and the in-place state according to the identification signal, the temperature detection unit and the identification unit are both connected with the grounding end of the main board through the connector, the grounding end of the main board is used as a reference ground in the detection loop, and the level is always 0V, so that the influence of extra impedance in the battery on the detection result is avoided, and the detection accuracy is improved; on the other hand, the main control chip is prevented from identifying the battery information by mistake, so that the battery can not be charged and discharged normally.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the contents of the present specification and the drawings, or applied to the related technical fields directly or indirectly, are included in the scope of the present invention.
Claims (10)
1. A battery temperature detection circuit, comprising: the temperature detection unit is positioned on the battery, and the first voltage division unit and the main control chip are positioned on the mainboard;
the temperature detection unit is used for detecting the temperature of the battery and outputting a detection signal to the main control chip through the first voltage division unit, the temperature detection unit is respectively connected with the first voltage division unit and the main control chip through a connector, and the first voltage division unit is connected with the main control chip;
the temperature detection unit is connected with the grounding end of the mainboard through the connector.
2. The battery temperature detection circuit according to claim 1, wherein the connector comprises:
one end of the temperature detection pin is connected with the temperature detection unit, and the other end of the temperature detection pin is respectively connected with the first voltage division unit and the main control chip;
and one end of the grounding pin is connected with the temperature detection pin, and the other end of the grounding pin is connected with the grounding end of the mainboard.
3. The battery temperature detection circuit according to claim 2, wherein the temperature detection unit includes thermistors connected to the temperature detection pin and the ground pin, respectively.
4. The battery temperature detection circuit of claim 3, wherein the first voltage division unit comprises a first resistor, one end of the first resistor is connected to the first power supply terminal, and the other end of the first resistor is connected to the temperature detection pin and the main control chip respectively.
5. The battery temperature detection circuit according to claim 2, further comprising an identification unit located on the battery and a second voltage division unit located on the main board;
the identification unit is used for outputting an identification signal to the main control chip through the second voltage division unit, the connector is respectively connected with the identification unit and the second voltage division unit, and the second voltage division unit is connected with the main control chip;
the identification unit is connected with the grounding end of the mainboard through the connector.
6. The battery temperature detection circuit of claim 5, wherein the connector further comprises an identification pin, one end of the identification pin is connected to the identification unit, and the other end of the identification pin is respectively connected to the second voltage division unit and the main control chip.
7. The battery temperature detection circuit of claim 6, wherein the identification unit comprises a second resistor, the second resistor being connected to the identification pin and the ground pin, respectively.
8. The battery temperature detection circuit of claim 7, wherein the second voltage division unit comprises a third resistor, one end of the third resistor is connected to the second power supply terminal, and the other end of the third resistor is connected to the identification pin and the main control chip respectively.
9. The battery temperature detection circuit of claim 1, wherein the connector further comprises:
the positive electrode pin is respectively connected with the positive electrode of the battery and the power supply input end of the mainboard;
and the negative electrode pin is respectively connected with the negative electrode of the battery and the grounding end of the mainboard.
10. The battery temperature detection circuit of claim 3, wherein the thermistor is an NTC thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122704443.7U CN216696605U (en) | 2021-11-05 | 2021-11-05 | Battery temperature detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122704443.7U CN216696605U (en) | 2021-11-05 | 2021-11-05 | Battery temperature detection circuit |
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| CN216696605U true CN216696605U (en) | 2022-06-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110913A (en) * | 2023-10-13 | 2023-11-24 | 荣耀终端有限公司 | Battery detection circuit, electronic device, and battery detection method |
| CN117723162A (en) * | 2024-02-07 | 2024-03-19 | 荣耀终端有限公司 | Battery temperature detection circuit, electronic device, and battery temperature detection method |
-
2021
- 2021-11-05 CN CN202122704443.7U patent/CN216696605U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110913A (en) * | 2023-10-13 | 2023-11-24 | 荣耀终端有限公司 | Battery detection circuit, electronic device, and battery detection method |
| CN117110913B (en) * | 2023-10-13 | 2024-04-05 | 荣耀终端有限公司 | Battery detection circuit, electronic device, and battery detection method |
| CN117723162A (en) * | 2024-02-07 | 2024-03-19 | 荣耀终端有限公司 | Battery temperature detection circuit, electronic device, and battery temperature detection method |
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