阅读说明：本技术 电池温度检测电路 (Battery temperature detection circuit ) 是由 向文溢 于 2019-11-08 设计创作，主要内容包括：本发明实施例提供的电池温度检测电路,包括：电池和检测电路；电池包括第一检测电极、第二检测电极和热敏电阻,第一检测电极和第二检测电极分别与热敏电阻连接；检测电路包括第一检测电路和第二检测电路,第一检测电路和第一检测电极连接,第二检测电路和第二检测电极连接；第一检测电路包括数模转换电路,数模转换电路用于将第一检测电极输出的模拟信号转换为数字信号,以得到热敏电阻对应的电压值。直接通过第一检测电极和第二检测电极单独实现热敏电阻的电压检测,从而无需对接触阻抗导致的电压差进行补偿,有效保证了电池温度检测的准确性。(The battery temperature detection circuit provided by the embodiment of the invention comprises: a battery and a detection circuit; the battery comprises a first detection electrode, a second detection electrode and a thermistor, wherein the first detection electrode and the second detection electrode are respectively connected with the thermistor; the detection circuit comprises a first detection circuit and a second detection circuit, the first detection circuit is connected with the first detection electrode, and the second detection circuit is connected with the second detection electrode; the first detection circuit comprises a digital-to-analog conversion circuit, and the digital-to-analog conversion circuit is used for converting an analog signal output by the first detection electrode into a digital signal so as to obtain a voltage value corresponding to the thermistor. The voltage detection of the thermistor is directly realized through the first detection electrode and the second detection electrode, so that the voltage difference caused by contact impedance is not required to be compensated, and the accuracy of battery temperature detection is effectively guaranteed.)

1. A battery temperature detection circuit, comprising: a battery and a detection circuit;

the battery comprises a first detection electrode, a second detection electrode and a thermistor, wherein the first detection electrode and the second detection electrode are respectively connected with the thermistor;

the detection circuit comprises a first detection circuit and a second detection circuit, the first detection circuit is connected with the first detection electrode, and the second detection circuit is connected with the second detection electrode;

the first detection circuit comprises a digital-to-analog conversion circuit, and the digital-to-analog conversion circuit is used for converting an analog signal output by the first detection electrode into a digital signal so as to obtain a voltage value corresponding to the thermistor.

2. The circuit of claim 1, wherein the first detection circuit further comprises a voltage divider circuit and a first contact;

the voltage division circuit and the digital-to-analog conversion circuit are respectively connected with the first detection electrode through the first contact.

3. The circuit of claim 2, wherein the voltage divider circuit comprises a power supply terminal and a pull-up resistor;

the pull-up resistor is connected with the power end and the first contact respectively.

4. The circuit of claim 2, wherein the second detection circuit comprises a second contact and a ground;

the second detection electrode is also connected to the ground terminal through the second contact.

5. The circuit according to any of claims 1-4, wherein the first detection circuit and the second detection circuit are disposed in a motherboard of a terminal device.

6. The circuit of claim 1, wherein the battery further comprises: a power supply circuit;

the power supply circuit is used for charging or discharging the battery.

7. The circuit of claim 6, wherein the power supply circuit comprises a battery positive electrode, a battery negative electrode, a cell positive electrode, and a cell negative electrode;

the battery anode is connected with the battery cell anode, and the battery cathode is connected with the battery cell cathode;

the battery anode is further connected with the main board of the terminal equipment through a third contact, and the battery cathode is further grounded through a fourth contact so as to supply power to the main board of the terminal equipment.

8. The circuit of claim 7, wherein the power supply circuit further comprises a protection circuit, and wherein the protection circuit is connected to the battery positive electrode and the cell positive electrode respectively.

9. The circuit of claim 3, wherein the first contact, the second contact, the third contact, and the fourth contact are disposed in a battery holder of the terminal device.

10. The circuit according to claim 3, wherein the voltage value of the power source terminal is a predetermined voltage value, and the resistance value of the pull-up resistor is a predetermined resistance value.

Technical Field

The embodiment of the invention relates to a terminal technology, in particular to a battery temperature detection circuit.

Background

With the continuous development of the terminal field, the battery also plays an increasingly important role, wherein the detection of the temperature of the battery can effectively ensure the safety and effectiveness of the terminal.

At present, in conventional battery temperature detection, a voltage value of a thermistor in a battery is usually obtained through an electrode for temperature detection, then the temperature of the battery is determined through a corresponding relationship between the voltage value of the thermistor and the temperature, and meanwhile, contact impedance exists between each electrode of the battery and a battery holder, so that the voltage value of the thermistor obtained by the electrode for temperature detection has deviation, and therefore, a compensation algorithm is required to be added to compensate a voltage difference corresponding to the contact impedance so as to obtain a relatively accurate battery temperature.

However, the contact resistance varies between different terminals, and the contact resistance also varies with the use of the terminals, thereby causing a deviation in the temperature detection of the battery.

Disclosure of Invention

The embodiment of the invention provides a battery temperature detection circuit, which is used for overcoming the problem that the temperature detection of a battery has deviation due to contact resistance of an electrode of the battery.

In a first aspect, an embodiment of the present invention provides a battery temperature detection circuit, including: a battery and a detection circuit;

the battery comprises a first detection electrode, a second detection electrode and a thermistor, wherein the first detection electrode and the second detection electrode are respectively connected with the thermistor;

the detection circuit comprises a first detection circuit and a second detection circuit, the first detection circuit is connected with the first detection electrode, and the second detection circuit is connected with the second detection electrode;

the first detection circuit comprises a digital-to-analog conversion circuit, and the digital-to-analog conversion circuit is used for converting an analog signal output by the first detection electrode into a digital signal so as to obtain a voltage value corresponding to the thermistor.

In one possible design, the first detection circuit further includes a voltage divider circuit and a first contact;

the voltage division circuit and the digital-to-analog conversion circuit are respectively connected with the first detection electrode through the first contact.

In one possible design, the voltage divider circuit includes a power supply terminal and a pull-up resistor;

the pull-up resistor is connected with the power end and the first contact respectively.

In one possible design, the second detection circuit includes a second contact and a ground;

the second detection electrode is also connected to the ground terminal through the second contact.

In one possible embodiment, the first detection circuit and the second detection circuit are arranged in a main board of the terminal device.

In one possible design, the battery further includes: a power supply circuit;

the power supply circuit is used for charging or discharging the battery.

In one possible design, the power supply circuit includes a battery positive electrode, a battery negative electrode, a cell positive electrode, and a cell negative electrode;

the battery anode is connected with the battery cell anode, and the battery cathode is connected with the battery cell cathode;

the battery anode is connected with the main board of the terminal equipment through a third contact, and the battery cathode is grounded through a fourth contact so as to supply power to the main board of the terminal equipment.

In one possible design, the power supply circuit further includes a protection circuit, and the protection circuit is connected to the battery positive electrode and the cell positive electrode, respectively.

In one possible design, the first contact, the second contact, the third contact and the fourth contact are arranged in a battery holder of the terminal device.

In one possible design, the voltage value of the power source end is a preset voltage value, and the resistance value of the pull-up resistor is a preset resistance value.

The battery temperature detection circuit provided by the embodiment of the invention comprises: a battery and a detection circuit; the battery comprises a first detection electrode, a second detection electrode and a thermistor, wherein the first detection electrode and the second detection electrode are respectively connected with the thermistor; the detection circuit comprises a first detection circuit and a second detection circuit, the first detection circuit is connected with the first detection electrode, and the second detection circuit is connected with the second detection electrode; the first detection circuit comprises a digital-to-analog conversion circuit, and the digital-to-analog conversion circuit is used for converting an analog signal output by the first detection electrode into a digital signal so as to obtain a voltage value corresponding to the thermistor. The detection of the voltage value of the thermistor is directly realized through a loop formed by the first detection circuit, the first detection electrode, the thermistor, the second detection electrode and the second detection circuit, and the temperature of the battery can be correspondingly determined according to the voltage value of the thermistor.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a first schematic structural diagram of a battery temperature detection circuit according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a battery temperature detection circuit according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a battery temperature detection circuit according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The battery refers to a part of the space of a cup, a tank or other container or a composite container which contains electrolyte solution and metal electrodes to generate current, and can convert chemical energy into electric energy.

At present, in a conventional battery temperature detection scheme, a detection circuit for detecting the temperature of a battery and a power supply circuit for realizing charging and discharging of the battery are connected together, wherein a thermistor in the battery and a negative electrode of the battery share a ground terminal, when the battery is charged or discharged, a voltage is generated between the negative electrode and a battery holder due to contact impedance existing between the negative electrode of the battery and the battery holder, and since the thermistor and the negative electrode of the battery are commonly grounded, a voltage difference corresponding to the negative electrode causes a deviation in voltage detection of the thermistor, so that in order to eliminate a voltage difference between the negative electrode of the battery and the battery holder due to the contact impedance, a compensation algorithm needs to be added for the temperature detection of the battery, to compensate for a deviation in the voltage value of the thermistor caused in the battery temperature detection due to the contact resistance.

However, the contact impedance is uncertain, specifically, the contact impedance of each terminal device is different, so that the uniformity of the compensation algorithm cannot be realized, and in the use process of the terminal device, or due to objective factors such as environmental change or material aging, the contact impedance of the terminal device is changed, so that the temperature detection of the battery is deviated, and a certain risk is caused to the normal use of the battery.

In addition, the current of the battery terminal is required to be used in the compensation algorithm, and the current detected by the battery terminal and the required voltage value detected by the temperature are required to be sampled at the same time, so that the overall scheme implementation of the compensation algorithm is quite complex.

Based on the above-described problem that the temperature detection of the battery cannot be used normally due to the deviation or error caused by the contact impedance needing to be compensated when detecting the temperature of the battery, the present invention provides a battery temperature detection circuit, which is described below with reference to a specific embodiment and first with reference to fig. 1.

Fig. 1 is a schematic structural diagram of a battery temperature detection circuit according to an embodiment of the present invention, as shown in fig. 1, the circuit includes: a battery 10 and a detection circuit 20;

the battery 10 includes a first detection electrode 101, a second detection electrode 102, and a thermistor R1, the first detection electrode 101 and the second detection electrode 102 being connected to the thermistor R1, respectively;

the detection circuit 20 comprises a first detection circuit 201 and a second detection circuit 202, wherein the first detection circuit 201 is connected with the first detection electrode 101, and the second detection circuit 202 is connected with the second detection electrode 102;

the first detecting circuit 201 includes a digital-to-analog converting circuit 2011, and the digital-to-analog converting circuit 2011 is configured to convert an analog signal output by the first detecting electrode 101 into a digital signal, so as to obtain a voltage value corresponding to the thermistor R1.

First, the thermistor R1 in the battery 10 is explained in detail, the thermistor R1 is a kind of sensitive element, and is characterized in that the thermistor is sensitive to temperature, and shows different resistance values at different temperatures, specifically, each thermistor R1 corresponds to a respective temperature coefficient, and a corresponding relationship between the resistance value and the temperature value of the thermistor R1 can be determined according to the temperature coefficient, wherein the thermistor R1 can be divided into a positive temperature coefficient thermistor and a negative temperature coefficient thermistor according to the difference of the temperature coefficients, the positive temperature coefficient thermistor has a larger resistance value at a higher temperature, and the negative temperature coefficient thermistor has a lower resistance value at a higher temperature, wherein specific models, types, temperature coefficients, and the like of the thermistor R1 can be selected according to actual requirements, which is not limited in this embodiment.

In this embodiment, the corresponding relationship between the voltage value and the temperature value of the thermistor R1 can be correspondingly determined according to the corresponding relationship between the resistance value and the temperature value of the thermistor R1, so that when the voltage value of the thermistor R1 is determined, the current battery temperature can be correspondingly determined, and the battery temperature can be detected, and an implementation manner of determining the voltage value of the thermistor R1 will be described below.

Specifically, the detection circuit 20 in this embodiment is configured to detect a voltage across the thermistor R1, where the detection circuit 20 includes a first detection circuit 201 and a second detection circuit 202, the first detection circuit 201 is connected to a first detection electrode 101 in the battery, and the second detection circuit 202 is connected to a second detection electrode 102 in the battery, and in this embodiment, the first detection circuit 201 specifically includes a digital-to-analog conversion circuit 2011, where the digital-to-analog conversion circuit 2011 is configured to convert an analog signal output by the first detection electrode into a digital signal, so as to obtain a voltage value corresponding to the thermistor.

In a possible implementation manner, the first detection circuit 201 may include, for example, a power supply terminal and a digital-to-analog conversion circuit 2011, and the second detection circuit 202 may include, for example, a ground terminal, so that the power supply terminal and the digital-to-analog conversion circuit 2011 of the first detection circuit 201 and the ground terminal of the second detection circuit 202 form a loop through the second detection electrode 102 of the battery and the thermistor R1, thereby detecting the voltage across the thermistor R1.

In another possible implementation manner, for example, the first detection circuit 201 may include a ground terminal, and the second detection circuit 202 may include a power terminal and a digital-to-analog conversion circuit 2011, which is similar to the possible implementation manners described above, and details are not described here, and a person skilled in the art can understand that, as long as a loop can be formed among the first detection circuit 201, the first detection electrode 101, the thermistor R1, the second detection electrode 102, and the second detection circuit 202, detection of the voltage across the thermistor R1 can be achieved, and various possible circuit implementation manners thereof can be expanded according to actual needs.

After the voltage across the thermistor R1 is detected, the temperature of the battery can be determined according to the correspondence between the voltage and the temperature of the thermistor R1, thereby achieving the detection of the battery temperature.

Compared with the current implementation scheme, in the present embodiment, the temperature of the battery is detected by the first detection electrode 101 and the second detection electrode 102, so that the detection circuit and the power supply circuit can work independently, at this time, although there is contact impedance between the electrode of the battery and the battery holder, because the thermistor is the second detection circuit connected by the second detection electrode, it does not need to be connected in common with the other electrodes of the battery, so that there is no need to compensate for a voltage difference generated by the contact impedance existing between the electrode and the battery holder, the voltage value of the thermistor is directly detected to determine the temperature of the battery, and the accuracy of detecting the temperature of the battery is effectively ensured.

The battery temperature detection circuit provided by the embodiment of the invention comprises: a battery and a detection circuit; the battery comprises a first detection electrode, a second detection electrode and a thermistor, wherein the first detection electrode and the second detection electrode are respectively connected with the thermistor; the detection circuit comprises a first detection circuit and a second detection circuit, the first detection circuit is connected with the first detection electrode, and the second detection circuit is connected with the second detection electrode; the first detection circuit comprises a digital-to-analog conversion circuit, and the digital-to-analog conversion circuit is used for converting an analog signal output by the first detection electrode into a digital signal so as to obtain a voltage value corresponding to the thermistor. The detection of the voltage value of the thermistor is directly realized through a loop formed by the first detection circuit, the first detection electrode, the thermistor, the second detection electrode and the second detection circuit, and the temperature of the battery can be correspondingly determined according to the voltage value of the thermistor.

On the basis of the foregoing embodiment, the following describes in further detail the battery temperature detection circuit provided in the embodiment of the present invention with reference to fig. 2, where fig. 2 is a schematic structural diagram of the battery temperature detection circuit provided in the embodiment of the present invention, as shown in fig. 2:

the first detection circuit 201 further includes a voltage divider circuit 2012 and a first contact 2013;

the voltage dividing circuit 2012 and the digital-to-analog conversion circuit 2011 are connected to the first detection electrode 101 via first contacts 2013, respectively.

The voltage dividing circuit 2012 and the first contact 2013 may be disposed in a motherboard of the terminal, or may also be disposed in an external circuit module, and the external circuit module is further connected to the terminal, which is not limited in this embodiment, where the voltage dividing circuit 2012 is configured to divide the voltage of the detection loop where the thermistor is located, so as to ensure that the resistance value of the thermistor can be effectively detected, and a possible implementation manner of the voltage dividing circuit 2012 for detecting the resistance value of the voltage value of the thermistor is described in detail below.

Specifically, in the present embodiment, the digital-to-analog converter 2011 is connected to the thermistor R1 through the first contact 2013 and the first detection electrode 101, so that the digital-to-analog converter 2011 can sample the voltage value V of the thermistor R1_adcSecondly, according to the following formula one:

VDD is the voltage value of the power supply end, V_adcFor the voltage value of the thermistor R1, R2 is the resistance value of the pull-up resistor, and then according to the above formula one, the resistance value of the thermistor R1 can be calculated, because the resistance value of the thermistor R1 changes with the change of the temperature, the voltage dividing circuit 2012 needs to be arranged to effectively realize the measurement of the resistance value of the thermistor R1, and then the current battery temperature is determined according to the corresponding relationship between the resistance value of the thermistor R1 and the temperature.

In this embodiment, the voltage dividing circuit 2012 and the digital-to-analog conversion circuit 2011 are specifically connected to the first detection electrode 101 through the first contact 2013, specifically, referring to fig. 2, when the first detection electrode 101 contacts the first contact 2031, the voltage dividing circuit 2012, the digital-to-analog conversion circuit 2011 and the thermistor R1 are equivalently connected, so that effective detection of the voltage of the thermistor R1 can be realized, and the first contact 2031 and the first detection electrode 101 can be disconnected at any time, so that on the premise of ensuring that the battery is convenient to detach and assemble, connection and disconnection of the first detection electrode 101 and the first detection circuit 201 can be quickly realized.

The battery temperature detection circuit that this embodiment provided can make the battery conveniently dismantle and assemble through set up first contact in first detection circuitry to can effectively promote the operating efficiency of the disconnection of first detection electrode and first detection circuitry's connection, divide voltage to thermistor's voltage through setting up bleeder circuit simultaneously, guarantee thermistor's the validity that the voltage value detected.

On the basis of the above-described embodiment, the following description is continued with reference to fig. 2, see fig. 2:

the voltage dividing circuit 2012 includes a power source terminal VDD and a pull-up resistor R2; the pull-up resistor R2 is connected to the power source terminal VDD and the first contact 2013, respectively.

Wherein, the power supply terminal VDD is used for supplying power to the detection circuit 10, and the pull-up resistor R2 is respectively connected with the power supply terminal VDD and the first contact 2013, so that the voltage division function of the voltage division circuit 2012 can be quickly and effectively realized through the pull-up resistor R2,

in a possible implementation manner, the voltage value of the power supply end VDD is a preset voltage value, the resistance value of the pull-up resistor R2 is a preset resistance value, and the specific values of the preset voltage value and the preset resistance value can be selected according to actual requirements as long as the preset voltage value and the preset resistance value are known and do not change in the working process of the battery.

Through setting up preset voltage value and presetting the resistance value, avoided the voltage of power end to change or pull-up resistance's resistance value to change, the voltage detection's of thermistor that leads to inaccurate to can guarantee when carrying out thermistor's voltage detection, promote voltage detection's accuracy and validity.

In the present embodiment, the second detection circuit 202 includes a second contact 2021 and a ground GND

The second detection electrode 102 is also connected to the ground GND through the second contact 2021.

Specifically, in the case where the second contact 2021 is similar to the first contact 2013, the specific implementation manner thereof can refer to the above description about the first contact 2013, and the second detection electrode 102 is connected to the ground terminal GND through the second contact 2021, which is not required to be grounded in common with the electrode of the battery, so that when the voltage of the thermistor R1 is detected, the detection of the voltage is performed directly by the first detection electrode 101 and the second detection electrode 102.

It is understood that although there are contact impedances between the first detecting electrode 101 and the first contact 2013, and between the second detecting electrode 102 and the second contact 2021, the detecting circuit and the power supply circuit in this embodiment are separately provided, so that the large current generated by the power supply circuit does not pass through the first contact 2013 and the second contact 2021 connected to the thermistor, and the current flowing in the detecting circuit is very small, and the voltage difference between the contact and the detecting electrode caused by the small current is very small and can be ignored, while for the contact impedance existing between the contact and the battery positive pole or the battery negative pole in the control circuit, because the current in the battery and the control circuit is relatively large, the voltage difference generated by the corresponding contact impedance is relatively large, so when the thermistor R1 and the battery negative pole are grounded together, the voltage difference generated by the battery negative pole is not negligible, the correctness of the voltage detection of the thermistor can be ensured only by performing corresponding compensation, so that the embodiment sets the first detection electrode 101 and the second detection electrode 102, and sets the thermistor R1 to be grounded through the second detection electrode 102, thereby compensating the voltage difference generated by the control circuit of the battery without the need of compensating, and simultaneously effectively ensuring the correctness of the temperature detection of the battery.

Meanwhile, the battery terminal VDD is connected to the first detection electrode 101 through the first contact 2013, and the second detection electrode 102 is connected to the ground terminal GND through the second contact 2021, so that the thermistor R1 can be ensured to be located in a stable and effective detection loop, and meanwhile, an effective voltage can be ensured to exist at both ends of the thermistor.

In a possible implementation manner, the first detection circuit 201 and the second detection circuit 202 are disposed in the main board of the terminal device, so that the detection of the battery temperature can be realized through the main board of the terminal device, and the detection of the battery temperature does not need to be performed by an additional device, thereby effectively improving the practicability and universality of the detection of the battery temperature.

On the basis of the above embodiment, the battery provided by the present invention further includes a power supply circuit, the power supply circuit in the battery is described below with reference to fig. 3, fig. 3 is a schematic structural diagram three of the battery temperature detection circuit provided by the embodiment of the present invention, as shown in fig. 3:

the battery includes a power supply circuit 30 therein, wherein the power supply circuit 30 is used to charge or discharge the battery.

Specifically, the power supply circuit 30 may discharge the battery when the battery supplies power to the terminal device, and charge the battery when the battery needs to be charged, it can be understood that, when the power supply circuit 30 discharges the battery, for example, the battery may be placed in the terminal device, and the battery is charged through the terminal device, or the battery may be detached from the terminal device, and the battery is charged through a charging device corresponding to the battery, which is not limited in this embodiment.

In this embodiment, the power supply circuit 30 is provided, so that the normal operation of the battery can be ensured.

In the present embodiment, the power supply circuit 30 includes a battery positive electrode, a battery negative electrode, a battery cell positive electrode 1, and a battery cell negative electrode 2;

the positive electrode of the battery is connected with the positive electrode 1 of the battery core, and the negative electrode of the battery is connected with the negative electrode 2 of the battery core;

the positive electrode of the battery is also connected with the main board of the terminal device through a third contact 301, and the negative electrode of the battery is also grounded through a fourth contact 302 to supply power to the main board of the terminal device.

The battery cell is an electrochemical cell containing a positive electrode and a negative electrode, and is an electric power storage part in the battery, when the battery needs to supply power to the terminal equipment, the battery cell supplies power so as to realize the discharge of the battery, and when the battery needs to be charged, the battery cell charges so as to realize the electric power storage of the battery.

In this embodiment, the positive electrode of the battery is connected to the positive electrode of the battery cell 1, and meanwhile, the positive electrode of the battery is further connected to the main board of the terminal device through the third contact 301, and the negative electrode of the battery is connected to the negative electrode of the battery cell 2, and the negative electrode of the battery is further grounded through the fourth contact 302, so that the main board of the terminal device, the third contact 301, the positive electrode of the battery cell 1, the negative electrode of the battery cell 2, the fourth contact 302, and the ground terminal form a power supply loop to supply power to the main board of the terminal device, or the battery can be charged to the battery through the main board of the terminal device, for example, see fig. 3, the positive electrode of the battery in fig. 3 outputs a power supply voltage to the main board of the terminal device through.

It should be noted that, referring to fig. 3, the second detecting electrode 102 connected to the thermistor R1 is grounded through the second contact 2021, and the battery cathode is grounded through the fourth contact 302, and the thermistor R1 and the battery cathode are located in different loops, so that the voltage difference generated by the contact impedance between the battery cathode and the fourth contact 302 does not affect the voltage detection of the thermistor, thereby effectively ensuring the accuracy of the battery temperature detection.

The battery temperature detection circuit that this embodiment provided, be connected through battery positive pole and electric core positive pole, the battery negative pole is connected with electric core negative pole, and the battery positive pole still is connected with terminal equipment's mainboard through the third contact, the battery negative pole still is through fourth contact ground connection, with the mainboard power supply to terminal equipment, thereby can realize the function of charging and the function of discharging of battery, and the battery negative pole passes through fourth contact ground connection, not share ground connection with thermistor, thereby need not to compensate to the voltage difference that the battery negative pole leads to, the accuracy that battery temperature detected has been guaranteed.

On the basis of the above-described embodiment, the following description is continued with reference to fig. 3, as shown in fig. 3:

the power supply circuit 30 further includes a protection circuit 303, and the protection circuit 303 is respectively connected to the battery positive electrode and the battery cell positive electrode 1.

The protection circuit 303 of the battery is provided to avoid abnormal situations such as overcharge, overdischarge, overcurrent, short circuit, and ultra-high temperature charge and discharge of the battery, and the protection circuit 303 may include circuit devices such as a switching tube, a resistor, and a capacitor, for example.

In this embodiment, through setting up protection circuit, can effectively guarantee the security and the stability of battery work.

In an optional embodiment, the power supply circuit 30 of the battery further includes a cell internal resistance R3, where the cell internal resistance R3 is connected to the battery positive electrode and the cell positive electrode 1, respectively. Because chemical substances exist between the positive material and the negative material of the battery, the positive material and the negative material react with each other to form a potential difference, so that the battery generates electric energy, and the intermediate chemical substances necessarily have resistance, namely the cell internal resistance R3 described in this embodiment.

In a possible implementation manner, the first contact 2013, the second contact 2021, the third contact 301 and the fourth contact 302 are arranged in a battery holder of the terminal device, wherein the battery holder is a device for connecting a battery in the terminal device, and each contact in the battery holder of the terminal device is connected with the battery, so that the detection of the temperature of the battery can be directly realized through the terminal device, the practicability and universality of the detection of the temperature of the battery which is effectively promoted can be realized, and meanwhile, the battery can be effectively supplied with power to the terminal device, or the terminal device charges the battery, and the normal work of the battery is ensured.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.