Single-port multi-channel temperature detection circuit, lithium battery and electronic equipment

Abstract

The utility model provides a single-port multi-channel temperature detection circuit, a lithium battery and electronic equipment, and belongs to the technical field of temperature detection. Wherein each output end of the shift register is respectively connected with the control end of one temperature detection module, and the temperature detection modules are respectively arranged in different areas of the lithium battery; the first output end and the second output end of the voltameter are connected with the second input end and the third input end of the shifting register respectively, and the voltameter outputs control signals to the shifting register through the first output end and the second output end so as to control output signals of the output ends of the shifting register and further control on-off of the temperature detection modules; the temperature sampling end of the voltameter is connected with the output end of each temperature detection module, and the voltameter samples the temperature value detected by each temperature detection module through the temperature sampling end. According to the invention, the temperature detection range of the lithium battery can be expanded, and the precision of the temperature detection result of the lithium battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of temperature detection, in particular to a single-port multi-path temperature detection circuit, a lithium battery and an electronic device. BACKGROUND

[0002] A negative temperature coefficient (NTC) thermistor is a sensor resistor, the resistance of the NTC thermistor changes with temperature, by monitoring the terminal voltage of the NTC thermistor, and converting the terminal voltage into corresponding digital information through a digital converter, the temperature value sampled by the NTC thermistor can be obtained. Therefore, the NTC thermistor is widely used in NTC temperature detection circuits, and the NTC temperature detection circuit is often arranged in the battery system of an electronic device, the real-time temperature of the battery during the operation of the electronic device is monitored through the NTC temperature detection circuit, and the safety of the operation of the electronic device is ensured.

[0003] In related technologies, a mobile phone battery includes an NTC interface, an NTC temperature detection circuit is connected through the NTC interface, and the temperature of the entire mobile phone battery is detected through the NTC temperature detection circuit.

[0004] However, when detecting the temperature of the mobile phone battery based on the related technology, the detection area of the NTC temperature detection circuit is limited, and the temperature distribution of the entire mobile phone battery cannot be covered, which leads to inaccurate temperature detection results of the mobile phone battery. Invention content

[0005] The purpose of the present application is to provide a single-port multi-path temperature detection circuit, a lithium battery and an electronic device, which can expand the temperature detection range of the lithium battery, and improve the accuracy of the temperature detection results of the lithium battery.

[0006] Embodiments of the present application are implemented as follows:

[0007] In a first aspect, a single-port multi-path temperature detection circuit is provided, which includes an electric quantity meter, a shift register and a plurality of temperature detection modules. The shift register includes a plurality of output terminals, and each output terminal of the shift register is connected to a control terminal of a temperature detection module. Each temperature detection module is arranged in a different region of a lithium battery.

[0008] The input end of the electric quantity meter and the first input end of the shift register are connected to a power supply voltage, the first output end of the electric quantity meter is connected to the second input end of the shift register, and the second output end of the electric quantity meter is connected to the third input end of the shift register. The electric quantity meter outputs control signals to the shift register through the first output end and the second output end to control the output signals of the output ends of the shift register, and the shift register controls the on-off of each temperature detection module under the control of the electric quantity meter.

[0009] The temperature sampling end of the electric quantity meter is connected to the output end of each temperature detection module, and the input end of each temperature detection module is grounded. The electric quantity meter samples the temperature values detected by each temperature detection module through the temperature sampling end.

[0010] As a possible implementation manner, the first output end of the electric quantity meter is a clock signal output end, and the second output end is a reset signal output end.

[0011] As a possible implementation manner, the second input end of the shift register is a clock signal input end, and the third input end is a reset signal input end.

[0012] As a possible implementation manner, each temperature detection module includes a temperature detection unit and a switch unit.

[0013] The input end of each switch unit is grounded, the control end of each switch unit is connected to one output end of the shift register, the output end of each switch unit is connected to one end of each temperature detection unit, and the other end of each temperature detection unit is connected to the temperature sampling end of the electric quantity meter.

[0014] As a possible implementation manner, each switch unit includes an N-type metal oxide semiconductor transistor.

[0015] The source of each N-type metal oxide semiconductor transistor is grounded, the gate of each N-type metal oxide semiconductor transistor is connected to one output end of the shift register, and the drain of each N-type metal oxide semiconductor transistor is connected to one end of each temperature detection unit.

[0016] As a possible implementation manner, each temperature detection unit includes a thermistor.

[0017] One end of each thermistor is connected to the drain of each N-type metal oxide semiconductor transistor, and the other end of each thermistor is connected to the temperature sampling end of the electric quantity meter.

[0018] As a possible implementation manner, each switch unit further includes a parasitic diode.

[0019] The input end of each parasitic diode is connected with the source of each N-type metal oxide semiconductor transistor, and the output end of each parasitic diode is connected with the drain of each N-type metal oxide semiconductor transistor.

[0020] As a possible implementation manner, the coulometer further comprises a ground terminal, and the shift register further comprises a ground terminal.

[0021] The second aspect of the embodiment of the present application provides a lithium battery, which comprises the single-port multi-channel temperature detection circuit of the first aspect.

[0022] The third aspect of the embodiment of the present application provides an electronic device, which comprises the lithium battery of the second aspect.

[0023] The beneficial effects of the embodiment of the present application include:

[0024] The single-port multi-channel temperature detection circuit provided by the embodiment of the present application comprises a coulometer, a shift register and a plurality of temperature detection modules, wherein the input end of the coulometer and the first input end of the shift register are both used for accessing a power supply voltage, the first output end of the coulometer is connected with the second input end of the shift register, the second output end of the coulometer is connected with the third input end of the shift register, the coulometer sends a control signal to the shift register through the first output end and the second output end, and the shift register adjusts the output level of each output end under the control of the coulometer; each output end of the shift register is connected with the control end of one temperature detection module, the output end of each temperature detection module is connected with the temperature sampling end of the coulometer, each temperature detection module is turned on or turned off under the action of the output level of the output end of the shift register connected with the temperature detection module, and the coulometer samples the temperature data detected by the turned-on temperature detection module through the temperature sampling end. In addition, each temperature detection module is distributed in different regions of the lithium battery, and the range of temperature detection of the lithium battery can be expanded. In this way, the range of temperature detection of the lithium battery can be expanded, and the accuracy of the temperature detection result of the lithium battery can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0026] Figure 1 The structure diagram of the first single-port multi-channel temperature detection circuit provided by the embodiment of the present application;

[0027] Figure 2 A structure schematic diagram of a second single-port multi-path temperature detection circuit provided by an embodiment of the present application is shown in FIG. 10B.

[0028] Figure 3 A structure schematic diagram of a third single-port multi-path temperature detection circuit provided by an embodiment of the present application is shown in FIG. 10C.

[0029] Figure 4 A structure schematic diagram of a fourth single-port multi-path temperature detection circuit provided by an embodiment of the present application is shown in FIG. 10D.

[0030] Figure 5 A temperature detection timing diagram of a single-port multi-path temperature detection circuit provided by an embodiment of the present application is shown in FIG. 10E.

[0031] Figure 6 A structure schematic diagram of a lithium battery provided by an embodiment of the present application is shown in FIG. 10F.

[0032] Figure 7 A structure schematic diagram of an electronic device provided by an embodiment of the present application is shown in FIG. 10G.

[0033] BRIEF DESCRIPTION OF DRAWINGS: 10: a single-port multi-path temperature detection circuit; 101: a coulometer; 102: a shift register; 103: a temperature detection module; 1031: a temperature detection unit; 311: a thermistor; 1032: a switch unit; 321: an N-type metal oxide semiconductor transistor; 322: a parasitic diode; 20: a lithium battery; 30: an electronic device. DETAILED DESCRIPTION

[0034] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0036] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, thus, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0037] In the description of the present application, it should be noted that the terms "first", "second", "third" and the like are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance. It should also be noted that, unless otherwise specified and limited, the terms "set", "install", "connect", "connect" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] At present, only one NTC interface is included in the mobile phone battery for connecting a temperature detection circuit, and the detection temperature of the entire mobile phone battery is obtained through one NTC interface via one temperature detection circuit. According to the detection temperature value received by the NTC interface, the temperature detection result of the entire mobile phone battery is determined. However, this scheme has the problem that the detection area of the NTC temperature detection circuit is limited and cannot cover the temperature distribution of the entire mobile phone battery, thereby resulting in inaccurate temperature detection result of the mobile phone battery.

[0039] Therefore, the embodiment of the present application provides a single-port multi-path temperature detection circuit, which distributes multiple temperature detection modules in multiple regions on a lithium battery of an electronic device, the control ends of the temperature detection modules are respectively connected with an output end of a shift register, the input end of the shift register is connected with the output end of a coulometer, and the temperature sampling end of the coulometer is respectively connected with the output end of each temperature detection module. After the power-on initialization is completed, the coulometer controls the shift register according to a preset clock sequence, the shift register adjusts the level output by each output end under the control of the coulometer, so as to control the on-off of each temperature detection module, the coulometer obtains the temperature value detected by each temperature detection module through the temperature sampling end, and the coulometer determines the running temperature detection result of the lithium battery according to the obtained temperature value. In this way, the temperature detection range of the lithium battery can be expanded, and the precision of the temperature detection result of the lithium battery can be improved.

[0040] The single-port multi-path temperature detection circuit provided by the embodiment of the present application will be explained and described in detail in combination with the drawings.

[0041] Figure 1 A structure diagram of a single-port multi-path temperature detection circuit provided by the present application is shown in the figure. The method can be applied to a lithium battery in an electronic device, which can be a mobile phone device. Referring to Figure 1The single-port multi-path temperature detection circuit 10 provided by the embodiment of the present application comprises: an electric quantity meter 101, a shift register 102, and a plurality of temperature detection modules 103. The shift register 102 comprises a plurality of output terminals, and each output terminal of the shift register 102 is connected to a control terminal of one temperature detection module 103. Each temperature detection module 103 is arranged in a different region of the lithium battery 20.

[0042] Optionally, the electric quantity meter 101 can be used not only to receive the temperature collected by each temperature detection module 103, but also to have other functions such as electric quantity management. The present application does not make a specific limitation on this. In the embodiment provided by the present application, only the part of the function of the electric quantity meter 101 participating in the temperature sampling of the lithium battery 20 is applied, for example, the electric quantity meter 101 controls the shift register 102, the shift register 102 controls the running state of each temperature detection module 103, the electric quantity meter 101 collects the temperature data detected by each temperature detection module 103, and the like.

[0043] Optionally, the shift register 102 can be shifted to the left or right under the action of each shift pulse, so that each temperature detection module 103 performs temperature detection periodically according to the timing specified by the electric quantity meter 101.

[0044] The input terminal of the electric quantity meter 101 and the first input terminal of the shift register 102 are both used to access a power supply voltage. The first output terminal of the electric quantity meter 101 is connected to the second input terminal of the shift register 102, and the second output terminal of the electric quantity meter 101 is connected to the third input terminal of the shift register 102. The electric quantity meter 101 is used to output control signals to the shift register 102 through the first output terminal and the second output terminal, so as to control the output signals of each output terminal of the shift register 102. The shift register 102 controls the on-off of each temperature detection module 103 under the control of the electric quantity meter 101.

[0045] Optionally, the input terminal of the electric quantity meter 101 and the first input terminal of the shift register 102 can be connected to the same power supply, or can be connected to different power supplies respectively. The power supply voltage is mainly used to provide working voltage for the electric quantity meter 101 and the shift register 102, so as to ensure that the electric quantity meter 101 and the shift register 102 can normally operate.

[0046] Optionally, the electric quantity meter 101 transmits a control signal to the second input end of the shift register 102 via the first output end, and transmits another control signal to the third input end of the shift register 102 via the second output end, and the shift register 102 adjusts the output signals of the output ends of the shift register 102 under the action of the two control signals output by the electric quantity meter 101, and each temperature detection module 103 is turned on or turned off under the action of the output signal of the output end of the shift register 102 connected thereto. It is worth noting that the control signals sent by the electric quantity meter 101 to the shift register 102 are all digital signals, and the output signals of the output ends of the shift register 102 are all level signals, which can be either high level or low level.

[0047] Optionally, the temperature detection module 103 can be realized by a temperature detection circuit, that is, the temperature detection module 103 can be realized by an NTC temperature detection circuit.

[0048] The temperature sampling ends of the electric quantity meter 101 are connected with the output ends of each temperature detection module 103 respectively, the input ends of each temperature detection module 103 are grounded, and the electric quantity meter 101 samples the temperature values detected by each temperature detection module 103 via the temperature sampling ends.

[0049] Optionally, the temperature sampling ends of the electric quantity meter 101 are connected with the output ends of each temperature detection module 103 respectively, the electric quantity meter 101 is connected with multiple temperature detection circuits via one temperature sampling end, the electric quantity meter 101 samples the detected temperature values of each temperature detection circuit in turn according to a certain time sequence via one temperature sampling end, and each temperature detection module 103 does not interfere with each other and is independent of each other.

[0050] In the embodiment of the present application, a single-port multi-channel temperature detection circuit is composed of an electric quantity meter, a shift register and multiple temperature detection modules. The input end of the electric quantity meter and the first input end of the shift register are both used to access the power supply voltage, the first output end of the electric quantity meter is connected with the second input end of the shift register, the second output end of the electric quantity meter is connected with the third input end of the shift register, the electric quantity meter sends control signals to the shift register through the first output end and the second output end, and the shift register adjusts the output levels of the output ends under the control of the electric quantity meter; the output ends of the shift register are connected with the control ends of one temperature detection module respectively, the output ends of each temperature detection module are connected with the temperature sampling ends of the electric quantity meter, each temperature detection module is turned on or turned off under the action of the output level of the output end of the shift register connected thereto, and the electric quantity meter samples the temperature data detected by the turned-on temperature detection module via the temperature sampling end. In addition, each temperature detection module is distributed in different regions of the lithium battery, which can expand the range of temperature detection of the lithium battery. In this way, the range of temperature detection of the lithium battery can be expanded, and the accuracy of the temperature detection result of the lithium battery can be improved.

[0051] In a possible implementation, referring to Figure 2 The first output end of the power meter 101 is a clock signal output end, and the second output end of the power meter 101 is a reset signal output end.

[0052] Optionally, the power meter 101 sends a clock signal to the shift register 102 via the first output end, and the power meter 101 sends a reset signal to the shift register 102 via the second output end. The clock signal is a periodic timing signal with a time interval and is preset. The clock signal can function to coordinate the operation of various components. The clock signal can provide a unified time standard for the single-port multi-channel temperature detection circuit 10, so that the power meter 101, the shift register 102, and each temperature detection module 103 can perform temperature sampling according to a correct running order and time period. The clock signal is generated by a crystal oscillator in the power meter 101 and is used to synchronize the timing of the circuit, thereby ensuring the stability and correctness of the circuit.

[0053] Optionally, the reset signal is used to reset the shift register 102 when an active clock edge of the clock signal arrives. The reset signal can force the single-port multi-channel temperature detection circuit 10 to be set in a determined working state, ensuring that the single-port multi-channel temperature detection circuit 10 enters a stable and determined state of operation.

[0054] In a possible implementation, referring to Figure 2 The second input end of the shift register 102 is a clock signal input end, and the third input end of the shift register 102 is a reset signal input end.

[0055] Optionally, the shift register 102 receives the clock signal sent by the power meter 101 via the second input end, and the shift register 102 receives the reset signal sent by the power meter 101 via the third input end. The shift register 102 controls the on-off time of each temperature detection module 103 under the action of the clock signal. The shift register 102 enters a control running phase of controlling each temperature detection module 103 under the action of the reset signal. Each temperature detection module 103 performs temperature sampling under the control of the shift register 102. The power meter 101 samples the temperature value detected by each temperature detection module 103 in sequence according to the timing of the clock signal via the temperature sampling end.

[0056] In a possible implementation, referring to Figure 3 Each temperature detection module 103 includes a temperature detection unit 1031 and a switch unit 1032.

[0057] Optionally, the temperature detection unit 1031 is configured to collect the ambient temperature of the area where the temperature detection module 103 is located in real time, and the switch unit 1032 is configured to respond to the output signal of the output end of the shift register 102, so that the temperature detection module 103 transmits the detected temperature value to the temperature sampling end of the coulometer 101.

[0058] The input end of each switch unit 1032 is grounded, the control end of each switch unit 1032 is connected with one output end of the shift register 102 respectively, the output end of each switch unit 1032 is connected with one end of each temperature detection unit 1031 respectively, and the other end of each temperature detection unit 1031 is connected with the temperature sampling end of the coulometer 101.

[0059] Optionally, the switch unit 1032 is configured to control the on-off between the temperature detection module 103 and the temperature sampling end of the coulometer 101. When the switch unit 1032 is turned on under the output level of the output end of the shift register 102 connected with the control end of the switch unit 1032, the temperature detection module 103 transmits the temperature data detected by the temperature detection unit 1031 to the temperature sampling end of the coulometer 101; otherwise, when the switch unit 1032 is turned off under the output level of the output end of the shift register 102 connected with the control end of the switch unit 1032, the temperature detection module 103 is in an off state, and the coulometer 101 cannot obtain the temperature data detected by the temperature detection module 103.

[0060] In a possible implementation, referring to Figure 4 Each switch unit 1032 comprises an N-type metal oxide semiconductor transistor 321.

[0061] The source of each N-type metal oxide semiconductor transistor 321 is grounded, the gate of each N-type metal oxide semiconductor transistor 321 is connected with one output end of the shift register 102 respectively, and the drain of each N-type metal oxide semiconductor transistor 321 is connected with one end of each temperature detection unit 1031 respectively.

[0062] Optionally, when the N-type metal oxide semiconductor transistor 321 is turned on under the high level output by the output end of the shift register 102 connected with the gate of the N-type metal oxide semiconductor transistor 321, the temperature detection module 103 transmits the temperature data detected by the temperature detection unit 1031 to the temperature sampling end of the coulometer 101; otherwise, when the N-type metal oxide semiconductor transistor 321 is turned off under the low level output by the output end of the shift register 102 connected with the gate of the N-type metal oxide semiconductor transistor 321, the temperature detection module 103 is in an off state, and the coulometer 101 cannot obtain the temperature data detected by the temperature detection module 103.

[0063] In a possible implementation, referring to Figure 4Each of the temperature detection units 1031 comprises a thermistor 311.

[0064] Optionally, the thermistor 311 can be implemented by an NTC resistor, and the thermistor 311 can be regarded as a sensor resistor for collecting the ambient temperature value of the region where the thermistor 311 is located in real time.

[0065] One end of each of the thermistors 311 is connected to the drain of each of the N-type metal oxide semiconductor transistors 321, and the other end of each of the thermistors 311 is connected to the temperature sampling end of the power meter 101.

[0066] Optionally, when the N-type metal oxide semiconductor transistor 321 is turned on when the output end of the shift register 102 connected to the gate of the N-type metal oxide semiconductor transistor 321 outputs a high level, the temperature detection module 103 transmits the temperature data detected by the thermistor 311 to the temperature sampling end of the power meter 101; otherwise, when the N-type metal oxide semiconductor transistor 321 is turned off when the output end of the shift register 102 connected to the gate of the N-type metal oxide semiconductor transistor 321 outputs a low level, the temperature detection module 103 is in an open circuit state, and the power meter 101 cannot obtain the temperature data detected by the thermistor 311 in the temperature detection module 103.

[0067] In one possible implementation, referring to Figure 4 Each of the switch units 1032 further comprises a parasitic diode 322.

[0068] Optionally, the parasitic diode 322 can effectively prevent damage to the N-type metal oxide semiconductor transistor 321 when the power supply is reversely connected.

[0069] The input end of each of the parasitic diodes 322 is connected to the source of each of the N-type metal oxide semiconductor transistors 321, and the output end of each of the parasitic diodes 322 is connected to the drain of each of the N-type metal oxide semiconductor transistors 321.

[0070] Optionally, the parasitic diode 322 of the N-type metal oxide semiconductor transistor 321 has the same effect as a common diode, and is turned on when the power supply of the N-type metal oxide semiconductor transistor 321 is connected in the normal direction, and is turned off when the power supply of the N-type metal oxide semiconductor transistor 321 is reversely connected. For example, when the source of the N-type metal oxide semiconductor transistor 321 is connected to the positive, and the drain of the N-type metal oxide semiconductor transistor 321 is connected to the negative, the parasitic diode 322 of the N-type metal oxide semiconductor transistor 321 is turned on; otherwise, when the source of the N-type metal oxide semiconductor transistor 321 is connected to the negative, and the drain of the N-type metal oxide semiconductor transistor 321 is connected to the positive, the parasitic diode 322 of the N-type metal oxide semiconductor transistor 321 is turned off.

[0071] In one possible implementation, referring to Figure 4 The power meter 101 further comprises a ground terminal, and the shift register 102 further comprises a ground terminal.

[0072] Optionally, the power meter 101 is grounded via the ground terminal, and the excess charge in the power meter 101 can be discharged. Similarly, the shift register 102 is grounded via the ground terminal, and the excess charge in the shift register 102 can be discharged.

[0073] Figure 5 A temperature detection timing diagram of the single-port multi-channel temperature detection circuit provided in the present application is shown in FIG. 10. Figure 5 The single-port multi-channel temperature detection circuit 10 provided in the embodiments of the present application comprises eight temperature detection modules 103, but this does not mean that the single-port multi-channel temperature detection circuit 10 provided in the embodiments of the present application can only be expanded into an 8-channel temperature detection circuit, which is not limited in the present application.

[0074] It should be noted that the N-type metal oxide semiconductor transistor is referred to as NMOS transistor hereinafter, the eight output terminals are represented by V1, V2, V3, V4, V5, V6, V7 and V8 respectively, the N-type metal oxide semiconductor transistors in the eight temperature detection modules are represented by NMOS transistor Q1, NMOS transistor Q2, NMOS transistor Q3, NMOS transistor Q4, NMOS transistor Q5, NMOS transistor Q6, NMOS transistor Q7 and NMOS transistor Q8 respectively, and the thermistors in the eight temperature detection modules are represented by RT1, RT2, RT3, RT4, RT5, RT6, RT7 and RT8 respectively.

[0075] The specific working principle of the single-port multi-path temperature detection circuit provided in the embodiments of the present application is as follows: S1, initialization stage: the power meter 101 and the shift register 102 start power-on, the power meter 101 and the shift register 102 enter the initialization stage, the power meter 101 pulls up the clock signal CLK to high level 1, at the same time, pulls up the reset signal RST to high level 1, and after the initialization of the power meter 101 and the shift register 102 is completed, the shift register 102 quickly pulls down the clock signal CLK to low level 0, at the same time, pulls down the reset signal RST to low level 0, and the output levels of the 8 output ends of the shift register 102 are all pulled down to low level 0; S2, temperature data acquisition stage: after the initialization stage is ended, the power meter 101 pulls up the clock signal CLK from low level 0 to high level 1, when the effective rising edge of the clock signal arrives, the shift register 102 is synchronously shifted, the output level of the V1 output end is set to high level 1, the N-type metal oxide semiconductor transistor Q1 connected with the V1 output end is turned on, the temperature data detected by the thermistor RT1 is transmitted to the temperature sampling end of the power meter 101, the power meter 101 samples the temperature data detected by the thermistor RT1 during the clock signal CLK is high level 1, and it is defaulted that the temperature data sampling of the thermistor RT1 is completed during the CLK is high level 1, after the temperature data sampling of the thermistor RT1 is completed, the power meter 101 quickly pulls down the clock signal CLK from high level 1 to low level 0, when the falling edge arrives, the shift register 102 sets the output level of the V1 output end to low level 0, the temperature detection module in which the RT1 and the NMOS tube Q1 are located is turned off, when the clock signal CLK is low level 0, it is determined that the temperature data sampled by the thermistor RT1 is all transmitted; after the temperature data detected by the thermistor RT1 is all released, the power meter 101 pulls up the clock signal CLK from low level 0 to high level 1, when the rising edge of the clock signal arrives, the shift register 102 is synchronously shifted, the output level of the V2 output end is set to high level 1, the N-type metal oxide semiconductor transistor Q2 connected with the V2 output end is turned on, the temperature data detected by the thermistor RT2 is transmitted to the temperature sampling end of the power meter 101, the power meter 101 samples the temperature data detected by the thermistor RT2 during the clock signal CLK is high level 1, after the temperature data sampling of the thermistor RT2 is completed, the power meter 101 quickly pulls down the clock signal CLK from high level 1 to low level 0, when the falling edge arrives, the shift register 102 sets the output level of the V2 output end to low level 0, the temperature detection module in which the RT2 and the NMOS tube Q2 are located is turned off, when the clock signal CLK is low level 0, it is determined that the temperature data sampled by the thermistor RT2 is all transmitted.After the temperature data detected by the thermistor RT2 is released completely, the clock signal CLK is pulled from low level 0 to high level 1 by the coulometer 101, and the shift register 102 is synchronously shifted when the rising edge of the clock signal arrives, so that the output level of the V3 output end is set to high level 1, and the N-type metal oxide semiconductor transistor Q3 connected to the V3 output end is turned on. The thermistor RT3 transmits the temperature data detected to the temperature sampling end of the coulometer 101, and the coulometer 101 samples the temperature data detected by the thermistor RT3 during the period when the clock signal CLK is at high level 1. After the temperature data sampling of the thermistor RT3 is completed, the clock signal CLK is quickly pulled from high level 1 to low level 0 by the coulometer 101, and the output level of the V3 output end is set to low level 0 by the shift register 102 when the falling edge arrives, so that the temperature detection module in which the thermistor RT3 and the NMOS transistor Q3 are located is turned off. When the clock signal CLK is at low level 0, it is determined that the thermistor RT3 has transmitted all the sampled temperature data completely. After the temperature data detected by the thermistor RT3 is released completely, the clock signal CLK is pulled from low level 0 to high level 1 by the coulometer 101, and the shift register 102 is synchronously shifted when the rising edge of the clock signal arrives, so that the output level of the V4 output end is set to high level 1, and the N-type metal oxide semiconductor transistor Q4 connected to the V4 output end is turned on. The thermistor RT4 transmits the temperature data detected to the temperature sampling end of the coulometer 101, and the coulometer 101 samples the temperature data detected by the thermistor RT4 during the period when the clock signal CLK is at high level 1. After the temperature data sampling of the thermistor RT4 is completed, the clock signal CLK is quickly pulled from high level 1 to low level 0 by the coulometer 101, and the output level of the V4 output end is set to low level 0 by the shift register 102 when the falling edge arrives, so that the temperature detection module in which the thermistor RT4 and the NMOS transistor Q4 are located is turned off. When the clock signal CLK is at low level 0, it is determined that the thermistor RT4 has transmitted all the sampled temperature data completely.After the thermal resistance RT4 releases all the detected temperature data, the electric quantity meter 101 pulls up the clock signal CLK from the low level 0 to the high level 1, and the shift register 102 is synchronously shifted when the rising edge of the clock signal arrives, so as to set the output level of the V5 output end to the high level 1, and the N-type metal oxide semiconductor transistor Q5 connected with the V5 output end is turned on. The thermal resistance RT5 transmits the detected temperature data to the temperature sampling end of the electric quantity meter 101, and the electric quantity meter 101 samples the temperature data detected by the thermal resistance RT5 during the high level 1 of the clock signal CLK. After the temperature data sampling of the thermal resistance RT5 is completed, the electric quantity meter 101 quickly pulls down the clock signal CLK from the high level 1 to the low level 0, and the output level of the V5 output end is set to the low level 0 by the shift register 102 when the falling edge arrives, so that the temperature detection module in which the thermal resistance RT5 and the NMOS transistor Q5 are located is turned off. When the clock signal CLK is at the low level 0, it is determined that the thermal resistance RT5 has completely transmitted the sampled temperature data. After the thermal resistance RT5 releases all the detected temperature data, the electric quantity meter 101 pulls up the clock signal CLK from the low level 0 to the high level 1, and the shift register 102 is synchronously shifted when the rising edge of the clock signal arrives, so as to set the output level of the V6 output end to the high level 1, and the N-type metal oxide semiconductor transistor Q6 connected with the V6 output end is turned on. The thermal resistance RT6 transmits the detected temperature data to the temperature sampling end of the electric quantity meter 101, and the electric quantity meter 101 samples the temperature data detected by the thermal resistance RT6 during the high level 1 of the clock signal CLK. After the temperature data sampling of the thermal resistance RT6 is completed, the electric quantity meter 101 quickly pulls down the clock signal CLK from the high level 1 to the low level 0, and the output level of the V6 output end is set to the low level 0 by the shift register 102 when the falling edge arrives, so that the temperature detection module in which the thermal resistance RT6 and the NMOS transistor Q6 are located is turned off. When the clock signal CLK is at the low level 0, it is determined that the thermal resistance RT5 has completely transmitted the sampled temperature data.After the temperature data detected by the thermistor RT6 is released completely, the electric quantity meter 101 pulls the clock signal CLK from low level 0 to high level 1, when the rising edge of the clock signal arrives, the shift register 102 is synchronously shifted, and the output level of the V7 output end is set to high level 1, the N-type metal oxide semiconductor transistor Q7 connected with the V7 output end is turned on, the temperature data detected by the thermistor RT7 is transmitted to the temperature sampling end of the electric quantity meter 101, the electric quantity meter 101 samples the temperature data detected by the thermistor RT7 during the clock signal CLK is at high level 1, after the temperature data sampling of the thermistor RT7 is completed, the electric quantity meter 101 quickly pulls the clock signal CLK from high level 1 to low level 0, when the falling edge arrives, the shift register 102 sets the output level of the V7 output end to low level 0, the temperature detection module in which the thermistor RT7 and the NMOS transistor Q7 are located is turned off, when the clock signal CLK is at low level 0, it is determined that the temperature data sampled by the thermistor RT7 is completely transmitted; after the temperature data detected by the thermistor RT6 is released completely, the electric quantity meter 101 pulls the clock signal CLK from low level 0 to high level 1, when the rising edge of the clock signal arrives, the shift register 102 is synchronously shifted, and the output level of the V8 output end is set to high level 1, the N-type metal oxide semiconductor transistor Q8 connected with the V8 output end is turned on, the temperature data detected by the thermistor RT8 is transmitted to the temperature sampling end of the electric quantity meter 101, the electric quantity meter 101 samples the temperature data detected by the thermistor RT8 during the clock signal CLK is at high level 1, after the temperature data sampling of the thermistor RT8 is completed, the electric quantity meter 101 quickly pulls the clock signal CLK from high level 1 to low level 0, when the falling edge arrives, the shift register 102 sets the output level of the V8 output end to low level 0, the temperature detection module in which the thermistor RT8 and the NMOS transistor Q8 are located is turned off, when the clock signal CLK is at low level 0, it is determined that the temperature data sampled by the thermistor RT8 is completely transmitted; during the continuous running of the electric quantity meter 101 and the shift register 102, the 8-way temperature detection module continuously and circularly samples the temperature according to the above timing; S3, ending data collection: the electric quantity meter 101 and the shift register 102 end the power-on, and the electric quantity meter 101 and the shift register 102 end the temperature data sampling.

[0076] The following describes the lithium battery and electronic equipment to which the single-port multi-way temperature detection circuit provided in the present application is applied, and the specific implementation process and technical effects are described above, and the following will not be described again.

[0077] Figure 6 is a structural schematic diagram of a lithium battery provided by the embodiment of the present application, referring to Figure 6The lithium battery 20 provided by the embodiment of the present application comprises the single-port multi-channel temperature detection circuit 10, and the single-port multi-channel temperature detection circuit 10 is used for comprehensively monitoring the temperature of the lithium battery 20, and the implementation principle and technical effects are consistent with the above, and the present application will not be repeated here.

[0078] Figure 7 is a structural schematic diagram of an electronic device provided by the embodiment of the present application, referring to Figure 7 The electronic device 30 provided by the embodiment of the present application comprises the lithium battery 20, the lithium battery 20 is used for providing a power supply signal for the operation of the electronic device 30, and the single-port multi-channel temperature detection circuit 10 is used for comprehensively monitoring the temperature of the lithium battery, and the present application will not be repeated here.

[0079] The above is merely a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, and all should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0080] The above is merely a preferred embodiment of the present application, and is not used for limiting the present application, and the present application can have various changes and changes for the person skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A single-port multi-channel temperature detection circuit, characterized in that, The single-port multi-channel temperature detection circuit comprises an electric quantity meter, a shift register and a plurality of temperature detection modules, the shift register comprises a plurality of output terminals, and each output terminal of the shift register is connected with a control terminal of one temperature detection module; each temperature detection module is arranged in a different region of the lithium battery. An input terminal of the electric quantity meter and a first input terminal of the shift register are both used for connecting a power supply voltage, a first output terminal of the electric quantity meter is connected with a second input terminal of the shift register, a second output terminal of the electric quantity meter is connected with a third input terminal of the shift register, the electric quantity meter is used for outputting control signals to the shift register through the first output terminal and the second output terminal to control output signals of each output terminal of the shift register, and the shift register controls on-off of each temperature detection module under control of the electric quantity meter. Temperature sampling terminals of the electric quantity meter are connected with output terminals of each temperature detection module, and input terminals of each temperature detection module are grounded; the electric quantity meter samples temperature values detected by each temperature detection module through the temperature sampling terminals.

2. The single port multiplexed temperature sensing circuit of claim 1, wherein, The first output terminal of the electric quantity meter is a clock signal output terminal, and the second output terminal is a reset signal output terminal.

3. The single port multiplexed temperature sensing circuit of claim 2, wherein, The second input terminal of the shift register is a clock signal input terminal, and the third input terminal is a reset signal input terminal.

4. The single port multiplexed temperature sensing circuit of claim 1, wherein, Each temperature detection module comprises a temperature detection unit and a switch unit. Input terminals of each switch unit are grounded, control terminals of each switch unit are connected with one output terminal of the shift register respectively, output terminals of each switch unit are connected with one end of each temperature detection unit respectively, and the other end of each temperature detection unit is connected with a temperature sampling terminal of the electric quantity meter.

5. The single port multiplexed temperature sensing circuit of claim 4, wherein, Each switch unit comprises an N-type metal oxide semiconductor transistor. Sources of each N-type metal oxide semiconductor transistor are grounded, gates of each N-type metal oxide semiconductor transistor are connected with one output terminal of the shift register respectively, and drains of each N-type metal oxide semiconductor transistor are connected with one end of each temperature detection unit respectively.

6. The single port multiplexed temperature sensing circuit of claim 5, wherein, Each temperature detection unit comprises a thermistor. One end of each thermistor is connected with a drain of each N-type metal oxide semiconductor transistor, and the other end of each thermistor is connected with a temperature sampling terminal of the electric quantity meter.

7. The single port multiplexed temperature sensing circuit of claim 5, wherein, Each switch unit further comprises a parasitic diode. Input terminals of each parasitic diode are connected with sources of each N-type metal oxide semiconductor transistor respectively, and output terminals of each parasitic diode are connected with drains of each N-type metal oxide semiconductor transistor respectively.

8. The single port multiplexed temperature sensing circuit of claim 1, wherein, The electric quantity meter further comprises a grounding terminal, and the shift register further comprises a grounding terminal.

9. A lithium battery, characterized by The lithium battery comprises the single-port multi-channel temperature detection circuit according to any one of claims 1-8.

10. An electronic device, comprising: The electronic device comprises the lithium battery according to claim 9.

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