Temperature protection circuit, protection chip, drive circuit and power supply device

Abstract

The present invention discloses a temperature protection circuit, a protection chip, a driving circuit and a power supply device. The temperature protection circuit includes: a voltage generation unit for generating at least one detection voltage; a protection trigger unit connected to a temperature-variable resistor component, the temperature-variable resistor component being used for generating a temperature-variable voltage and being capable of correspondingly changing the temperature-variable voltage according to the current temperature of the battery, the protection trigger unit being used for outputting a protection trigger signal according to the temperature-variable voltage and the at least one detection voltage; when the voltage generation unit generates at least two detection voltages, the protection trigger unit is configured to output a protection trigger signal according to the temperature-variable voltage and one detection voltage determined in a preset order. The above temperature protection circuit obtains a protection trigger signal through the temperature-variable voltage and the generated detection voltage, and does not need to implement different temperature protection functions by repeatedly setting the entire circuit structure, thereby simplifying the circuit structure and being beneficial to reducing power consumption and size area.

Description

Technical Field

[0001] The present invention relates to the technical field of battery protection, and particularly relates to a temperature protection circuit, a protection chip, a driving circuit and a power supply device. Background Art

[0002] In related applications, a battery can achieve over-temperature protection through a battery protection chip, so that power supply can be cut off when the temperature of the battery is too high or too low, preventing the battery from being damaged. In related technologies, determining whether to perform over-temperature protection can be achieved through a temperature-sensitive element. However, currently, the accuracy of this type of protection circuit is poor, and process consistency with other related components needs to be ensured. Moreover, the situation of temperature protection in a battery protection chip is complex, and high-temperature charging prohibition protection, high-temperature charge and discharge prohibition protection, low-temperature charging prohibition protection, and low-temperature charge and discharge prohibition protection are required, making the traditional temperature protection circuit consume a large amount of power and occupy a large size area. Summary of the Invention

[0003] Embodiments of the present invention provide a temperature protection circuit, a protection chip, a driving circuit and a power supply device.

[0004] A temperature protection circuit according to an embodiment of the present invention is used for over-temperature protection of a battery. The temperature protection circuit includes:

[0005] a voltage generation unit configured to generate at least one detection voltage; and

[0006] a protection trigger unit connected to a temperature-variable resistor. The temperature-variable resistor is configured to generate a temperature-variable voltage and can change the temperature-variable voltage according to the current temperature of the battery. The protection trigger unit is configured to output a protection trigger signal according to the temperature-variable voltage and at least one of the detection voltages, and the protection trigger signal is used to determine whether an over-temperature protection action is generated;

[0007] When the voltage generation unit generates at least two of the detection voltages, the at least two detection voltages respectively correspond to different voltage values, and the protection trigger unit is configured to output the protection trigger signal according to the temperature-variable voltage and one of the detection voltages determined in a preset order.

[0008] In the above temperature protection circuit, a protection trigger signal is obtained through the temperature-variable voltage and the generated detection voltage. Since the temperature-variable voltage corresponds to the current temperature of the battery, whether the current temperature of the battery is at a level that requires over-temperature protection can be reflected through the protection trigger signal, and different detection voltages can be generated by the voltage generation unit, without the need to repeat the entire circuit structure to implement different temperature protection functions, thus simplifying the circuit structure and being beneficial to reducing power consumption and size area.

[0009] In some embodiments, the voltage generating unit includes:

[0010] At least two voltage dividing resistive elements, which are connected in series in sequence to form a voltage dividing branch, and a voltage dividing point is formed at the position between two adjacent voltage dividing resistive elements;

[0011] Both ends of the voltage dividing branch are respectively connected to a high voltage end and a low voltage end, and a potential difference is formed between the high voltage end and the low voltage end, so that a corresponding one of the detection voltages is generated at the voltage dividing point.

[0012] In this way, the detection voltage can be generated through the voltage dividing potential.

[0013] In some embodiments, the temperature protection circuit includes:

[0014] A voltage selection unit, which includes at least one selection conduction element, and the selection conduction element is connected to the protection trigger unit and a corresponding one of the voltage dividing points, and the selection conduction element is used to selectively conduct or cut off the protection trigger unit and a corresponding one of the voltage dividing points;

[0015] When the voltage selection unit includes at least two selection conduction elements, the at least two selection conduction elements are configured to conduct the protection trigger unit and a corresponding one of the voltage dividing points in a preset order and maintain the corresponding duration, and make the protection trigger unit only connected to one voltage dividing point.

[0016] In this way, the detection voltage of the voltage dividing point can be conducted to the protection trigger unit through the selection conduction element.

[0017] In some embodiments, the temperature protection circuit includes:

[0018] A sampling unit, which is connected to the protection trigger unit, and the sampling unit is used to output a sampling signal according to the protection trigger signal when receiving a sampling detection signal.

[0019] In this way, continuous detection can be avoided through sampling processing to increase power consumption.

[0020] In some embodiments, the sampling unit includes:

[0021] At least one sampling element, which is connected to the protection trigger unit, and each sampling element corresponds to one sampling detection signal;

[0022] When the voltage generating unit generates at least two detection voltages, the sampling unit includes at least two sampling elements, and each sampling element corresponds to one detection voltage;

[0023] The sampling unit is configured to output the sampling signal according to the protection trigger signal through a corresponding one of the sampling components when determining one of the detection voltages in accordance with the preset order and receiving one of the sampling detection signals.

[0024] In this way, it is beneficial to reduce the complexity of component types and simplify the circuit layout.

[0025] In some embodiments, the temperature protection circuit includes:

[0026] A logic processing unit configured to receive the sampling signals output by at least two of the sampling components and generate a protection action signal, the level state of the protection action signal corresponding to the level state of the protection trigger signal.

[0027] In this way, it is beneficial to reduce the number of circuits.

[0028] In some embodiments, the logic processing unit includes:

[0029] At least one logic processing subunit, each logic processing subunit being configured to receive the sampling signals output by a corresponding part of at least two of the sampling components and generate a corresponding one of the protection action signals.

[0030] In this way, the processing efficiency can be further improved and the number of circuits can be reduced.

[0031] A protection chip according to an embodiment of the present invention is used for over-temperature protection of a battery. The protection chip includes:

[0032] The temperature protection circuit according to any one of the above embodiments; and

[0033] A logic control circuit configured to generate a drive signal according to the protection trigger signal, the drive signal being used to perform an over-temperature protection operation;

[0034] The over-temperature protection actions include an over-temperature charging protection action and an over-temperature charge-discharge protection action. When it is determined to perform the over-temperature charging protection action, the protection chip is configured to disconnect the path for supplying power from the conductive end to the battery. When it is determined to perform the over-temperature charge-discharge protection action, the protection chip is configured to disconnect the path for supplying power from the conductive end to the battery and the path for supplying power from the battery to the conductive end.

[0035] The above-mentioned protection chip obtains a protection trigger signal through the temperature-variable voltage and the generated detection voltage. Since the temperature-variable voltage corresponds to the current temperature of the battery, the protection trigger signal can be used to reflect whether the current temperature of the battery is at a level that requires over-temperature protection. Moreover, different detection voltages can be generated by the voltage generation unit, and there is no need to repeatedly set the entire circuit structure to achieve different temperature protection functions, thus simplifying the circuit structure and facilitating the reduction of power consumption and size area.

[0036] A drive circuit according to an embodiment of the present invention is used for over-temperature protection of a battery. The drive circuit includes:

[0037] The protection chip described in the above embodiment; and

[0038] A control conduction part, the control conduction part is connected to the protection chip and the battery;

[0039] When it is determined to execute the over-temperature charging protection action, the protection chip is used to drive the control conduction part to disconnect the path for supplying power to the battery from the conductive end. When it is determined to execute the over-temperature charge and discharge protection action, the protection chip is used to drive the control conduction part to disconnect the path for supplying power to the battery from the conductive end and the path for supplying power from the battery to the conductive end.

[0040] The above drive circuit obtains a protection trigger signal through the temperature-variable voltage and the generated detection voltage. Since the temperature-variable voltage corresponds to the current temperature of the battery, the protection trigger signal can be used to reflect whether the current temperature of the battery is at a level that requires over-temperature protection. Moreover, different detection voltages can be generated by the voltage generation unit, and there is no need to repeatedly set the entire circuit structure to achieve different temperature protection functions, thus simplifying the circuit structure and facilitating the reduction of power consumption and size area.

[0041] A power supply device according to an embodiment of the present invention includes:

[0042] A battery; and

[0043] The drive circuit described in the above embodiment, the drive circuit is connected to the battery.

[0044] The above power supply device obtains a protection trigger signal through the temperature-variable voltage and the generated detection voltage. Since the temperature-variable voltage corresponds to the current temperature of the battery, the protection trigger signal can be used to reflect whether the current temperature of the battery is at a level that requires over-temperature protection. Moreover, different detection voltages can be generated by the voltage generation unit, and there is no need to repeatedly set the entire circuit structure to achieve different temperature protection functions, thus simplifying the circuit structure and facilitating the reduction of power consumption and size area.

[0045] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0046] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0047] Figure 1 is a schematic circuit connection diagram of a power supply device according to an embodiment of the present invention;

[0048] Figure 2 is a schematic module diagram of a temperature protection circuit according to an embodiment of the present invention;

[0049] Figure 3 is a schematic circuit connection diagram of a temperature protection circuit according to an embodiment of the present invention;

[0050] Figure 4 is a schematic structural diagram of a sampling component according to an embodiment of the present invention;

[0051] Figure 5 is a schematic structural diagram of a logic processing unit according to an embodiment of the present invention;

[0052] Figure 6 is a timing diagram of a temperature protection circuit according to an embodiment of the present invention.

[0053] Description of the Reference Numerals:

[0054] 100, temperature protection circuit; 12, voltage generation unit; 14, protection trigger unit; 15, temperature-variable electrical component; 16, comparator; 18, first input terminal; 20, second input terminal; 22, output comparison terminal; 24, first inverter; 26, output inverting terminal; 28, TH pin; 30, voltage-dividing resistor component; 32, voltage-dividing branch; 34, high-voltage terminal; 36, low-voltage terminal; 38, voltage selection unit; 40, selection conduction component; 42, first conduction component; 46, second conduction component; 48, third conduction component; 50, fourth conduction component; 52, first gate terminal; 54, second gate terminal; 56, third gate terminal; 58, fourth gate terminal; 60, sampling unit; 62, sampling component; 64, first sampling component; 66, second sampling component; 68, third sampling component; 70, fourth sampling component; 72, first sampling input terminal; 74, second sampling input terminal; 75, sampling connection terminal; 76, sampling output terminal; 78, logic processing unit; 80, logic processing sub-unit; 82, first sub-unit; 84, second unit; 86, first logic processing input terminal; 88, second logic processing input terminal; 90, logic processing output terminal; 92, second inverter; 94, inverting output terminal;

[0055] 200. Protection chip; 102. Logic control circuit; 104. CO port; 106. DO port;

[0056] 300. Drive circuit; 108. Control conduction part; 110. First switching tube; 112. Second switching tube; 114. Conductive end;

[0057] 400. Power supply device; 116. Battery; 118. Charge pump; 120. Overcurrent protection circuit; 122. Voltage detection circuit; 124. Drive circuit; 126. Detection resistor. Detailed implementation manners

[0058] The following describes in detail the implementation manners of the present invention. Examples of the implementation manners are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The implementation manners described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0059] Please refer Figures 1 to 3 , a temperature protection circuit 100 according to an implementation manner of the present invention is used for over-temperature protection of the battery 116. The temperature protection circuit 100 includes a voltage generation unit 12 and a protection trigger unit 14. The voltage generation unit 12 is used to generate at least one detection voltage. The protection trigger unit 14 is connected to a temperature-variable resistor 15. The temperature-variable resistor 15 is used to generate a temperature-variable voltage and can change the temperature-variable voltage according to the current temperature of the battery 116. The protection trigger unit 14 is used to output a protection trigger signal according to the temperature-variable voltage and at least one detection voltage. The protection trigger signal is used to determine whether an over-temperature protection action is generated. When the voltage generation unit 12 generates at least two detection voltages, the at least two detection voltages respectively correspond to different voltage values. The protection trigger unit 14 is configured to output a protection trigger signal according to the temperature-variable voltage and a detection voltage determined in a preset order.

[0060] For the above temperature protection circuit 100, a protection trigger signal is obtained through the temperature-variable voltage and the generated detection voltage. Since the temperature-variable voltage corresponds to the current temperature of the battery 116, it is possible to reflect whether the current temperature of the battery 116 is at a level that requires over-temperature protection through the protection trigger signal, and different detection voltages can be generated by the voltage generation unit 12, without the need to repeat the entire circuit structure to implement different temperature protection functions, thereby simplifying the circuit structure and being beneficial to reducing power consumption and size area.

[0061] Specifically, the over-temperature protection includes high-temperature charging prohibition protection, high-temperature charge and discharge prohibition protection, low-temperature charging prohibition protection, and low-temperature charge and discharge prohibition protection. Figure 3In it, the voltage generating unit 12 can generate four detection voltages. Each detection voltage can correspond to a different voltage value. The four detection voltages can be the first voltage, the second voltage, the third voltage, and the fourth voltage respectively. The protection trigger unit 14 includes a comparator 16. The comparator 16 has a first input terminal 18, a second input terminal 20, and an output comparison terminal 22. The second input terminal 20 can be connected to the temperature-variable resistor 15. The temperature-variable resistor 15 can generate a temperature-variable voltage and can change the temperature-variable voltage accordingly according to the current temperature of the battery 116. That is to say, the temperature-variable resistor 15 can have a negative temperature voltage characteristic. The negative temperature voltage characteristic means that the higher the current temperature of the battery 116, the lower the temperature-variable voltage. In one embodiment, the temperature-variable voltage generated by the temperature-variable resistor 15 can be transmitted to the second input terminal 20, and a detection voltage generated by the voltage generating unit 12 can be transmitted to the first input terminal 18, and then compared by the protection trigger unit 14, and finally a protection trigger signal is output from the output comparison terminal 22. The protection trigger unit 14 can output a protection trigger signal according to the temperature-variable voltage and a detection voltage determined in a preset order, where the detection voltage is a fixed voltage set in a preset order, and then as the current temperature of the battery 116 changes, the temperature-variable voltage also changes, so that a corresponding protection trigger signal can be output. In one embodiment, when the temperature-variable voltage is greater than the detection voltage, the protection trigger signal output from the output comparison terminal 22 is at a low level. In one embodiment, when the temperature-variable voltage is less than the detection voltage, the protection trigger signal output from the output comparison terminal 22 is at a high level, so that the current temperature of the battery 116 can be reflected by the protection trigger signal whether it is at a level that requires over-temperature protection.

[0062] The protection trigger unit 14 further includes a first inverter 24. The first inverter 24 is connected to the output comparison terminal 22. The first inverter 24 has an output inversion terminal 26. In one embodiment, the protection trigger signal can be output through the output inversion terminal 26. In addition, in Figure 1 In it, a first switching tube 110 and a second switching tube 112 are provided in the circuit. The first switching tube 110 and the second switching tube 112 are connected to the positive electrode side of the battery 116, so that the battery 116 protection circuit is beneficial to positive terminal protection. In Figure 3 In it, the temperature protection circuit 100 is provided with a TH pin 28. The TH pin 28 can be connected to the temperature-variable resistor 15.

[0063] Please refer to Figure 3 , in some embodiments, the voltage generating unit 12 includes at least two voltage-dividing resistor components 30. At least two voltage-dividing resistor components 30 are connected in series in sequence to form a voltage-dividing branch 32. A voltage-dividing point is formed between two adjacent voltage-dividing resistor components 30. Both ends of the voltage-dividing branch 32 are respectively connected to a high-voltage end 34 and a low-voltage end 36. A potential difference is formed between the high-voltage end 34 and the low-voltage end 36, so that a corresponding detection voltage is generated at the voltage-dividing point.

[0064] In this way, a detection voltage can be generated through the divided voltage potential.

[0065] Specifically, in Figure 3 , the voltage generation unit 12 is provided with five voltage dividing resistor components 30. The five voltage dividing resistor components 30 can be sequentially connected in series to form a voltage dividing branch 32. The temperature protection circuit 100 is provided with four voltage dividing points. A voltage dividing point can be formed between two adjacent voltage dividing resistor components 30, and a corresponding detection voltage can be generated at each voltage dividing point. In the direction from the high voltage end 34 to the low voltage end 36, the voltage dividing points generated between two adjacent voltage dividing resistor components 30 can be respectively represented as the first point V1, the second point V2, the third point V3, and the fourth point V4. The detection voltages corresponding to the four voltage dividing potentials are respectively the first voltage, the second voltage, the third voltage, and the fourth voltage.

[0066] Please refer to Figure 3 , in some embodiments, the temperature protection circuit 100 includes a voltage selection unit 38. The voltage selection unit 38 includes at least one selection conduction component 40. The selection conduction component 40 is connected to the protection trigger unit 14 and a corresponding voltage dividing point. The selection conduction component 40 is used to selectively conduct or cut off the protection trigger unit 14 and a corresponding voltage dividing point. When the voltage selection unit 38 includes at least two selection conduction components 40, the at least two selection conduction components 40 are configured to sequentially conduct the protection trigger unit 14 and a corresponding voltage dividing point in a preset order and maintain the corresponding duration, and make the protection trigger unit 14 only connect to one voltage dividing point.

[0067] In this way, the detection voltage of the voltage dividing point can be conducted to the protection trigger unit 14 through the selection conduction component 40.

[0068] Specifically, in Figure 3 , the voltage selection unit 38 is provided with four selection conduction components 40, and the four selection conduction components 40 can be respectively the first conduction component 42, the second conduction component 46, the third conduction component 48, and the fourth conduction component 50. The first conduction component 42, the second conduction component 46, the third conduction component 48, and the fourth conduction component 50 can be connected to the comparator 16 through the first input terminal 18. The first conduction component 42 can be connected to the first point. The second conduction component 46 can be connected to the second point. The third conduction component 48 can be connected to the third point. The fourth conduction component 50 can be connected to the fourth point. In one embodiment, the selection conduction component 40 can conduct the protection trigger unit 14 and a corresponding voltage dividing point. In one embodiment, the selection conduction component 40 can cut off the protection trigger unit 14 and a corresponding voltage dividing point.

[0069] In one embodiment, the first conducting component 42 can conductively connect the protection trigger unit 14 through the source electrode in a preset order and conductively connect the first point in position through the drain electrode and maintain for a corresponding duration, while the second conducting component 46, the third conducting component 48, and the fourth conducting component 50 are disconnected, so that the protection trigger unit 14 is only connected to the first point in position, ensuring that the first voltage is transmitted to the protection trigger unit 14 for comparison with the temperature change voltage of the current temperature of the battery 116.

[0070] In one embodiment, the first conducting component 42 can conductively connect the protection trigger unit 14 through the source electrode in a preset order and conductively connect the first point in position through the drain electrode and maintain for a corresponding duration, while the second conducting component 46, the third conducting component 48, and the fourth conducting component 50 are disconnected, so that the protection trigger unit 14 is only connected to the first point in position, ensuring that the first voltage is transmitted to the protection trigger unit 14 for comparison with the temperature change voltage of the current temperature of the battery 116.

[0071] In one embodiment, the second conducting component 46 can conductively connect the protection trigger unit 14 through the source electrode in a preset order and conductively connect the second point in position through the drain electrode and maintain for a corresponding duration, while the first conducting component 42, the third conducting component 48, and the fourth conducting component 50 are disconnected, so that the protection trigger unit 14 is only connected to the second point in position, ensuring that the second voltage is transmitted to the protection trigger unit 14 for comparison with the temperature change voltage of the current temperature of the battery 116.

[0072] In one embodiment, the third conducting component 48 can conductively connect the protection trigger unit 14 through the source electrode in a preset order and conductively connect the third point in position through the drain electrode and maintain for a corresponding duration, while the first conducting component 42, the second conducting component 46, and the fourth conducting component 50 are disconnected, so that the protection trigger unit 14 is only connected to the third point in position, ensuring that the third voltage is transmitted to the protection trigger unit 14 for comparison with the temperature change voltage of the current temperature of the battery 116.

[0073] In one embodiment, the fourth conducting component 50 can conductively connect the protection trigger unit 14 through the source electrode in a preset order and conductively connect the fourth point in position through the drain electrode and maintain for a corresponding duration, while the first conducting component 42, the second conducting component 46, and the third conducting component 48 are disconnected, so that the protection trigger unit 14 is only connected to the fourth point in position, ensuring that the fourth voltage is transmitted to the protection trigger unit 14 for comparison with the temperature change voltage of the current temperature of the battery 116.

[0074] It should be noted that the selected conducting component 40 includes a PMOS transistor (P-channel metal-oxide-semiconductor field-effect transistor). The first conducting component 42 has a first gate terminal 52. The second conducting component 46 has a second gate terminal 54. The third conducting component 48 has a third gate terminal 56. The fourth conducting component 50 has a fourth gate terminal 58.

[0075] In addition, in one embodiment, when the first gate terminal 52 is at a high level, the comparator 16 can be used to detect whether to trigger the low-temperature charge and discharge prohibition protection. At this time, the first conducting component 42 is turned on, and the second conducting component 46, the third conducting component 48, and the fourth conducting component 50 are turned off. When the current temperature of the battery 116 is higher than the low-temperature charge and discharge prohibition protection threshold, the temperature-variable voltage is less than the first voltage, and the level output by the output comparison terminal 22 of the comparator 16 is at a high level. Then, the level of the protection trigger signal output by the output inversion terminal 26 of the first inverter 24 can become a low level. When the current temperature of the battery 116 is lower than the low-temperature charge and discharge prohibition protection threshold, the temperature-variable voltage is greater than the first voltage, and the level output by the output comparison terminal 22 of the comparator 16 is at a low level. Then, the level of the protection trigger signal output by the output inversion terminal 26 of the first inverter 24 can become a high level.

[0076] In one embodiment, when the second gate terminal 54 is at a high level, the protection trigger unit 14 can be used to detect whether to trigger the low-temperature charging prohibition protection. At this time, the second conducting component 46 is turned on, and the first conducting component 42, the third conducting component 48, and the fourth conducting component 50 are turned off. When the current temperature of the battery 116 is higher than the low-temperature charging prohibition protection threshold, the temperature-variable voltage is less than the second voltage, and the level output by the output comparison terminal 22 of the comparator 16 is at a high level. Then, the level of the protection trigger signal output by the output inversion terminal 26 of the first inverter 24 can become a low level. When the current temperature of the battery 116 is lower than the low-temperature charging prohibition protection threshold, the temperature-variable voltage is greater than the second voltage, and the level output by the output comparison terminal 22 of the comparator 16 is at a low level. Then, the level of the protection trigger signal output by the output inversion terminal 26 of the first inverter 24 can become a high level.

[0077] In one embodiment, when the third gate terminal 56 is at a high level, the protection trigger unit 14 can be used to detect whether to trigger the high-temperature charging prohibition protection. At this time, the third conducting component 48 is turned on, and the first conducting component 42, the second conducting component 46, and the fourth conducting component 50 are turned off. When the current temperature of the battery 116 is lower than the high-temperature charging prohibition protection threshold, the temperature-variable voltage is greater than the third voltage, and the protection trigger signal output by the output comparison terminal 22 of the comparator 16 is at a low level. When the current temperature of the battery 116 is higher than the high-temperature charging prohibition protection threshold, the temperature-variable voltage is less than the third voltage, and the protection trigger signal output by the output comparison terminal 22 of the comparator 16 is at a high level.

[0078] In one embodiment, when the fourth gate terminal 58 is at a high level, the protection trigger unit 14 can be used to detect whether to trigger the high-temperature charge and discharge prohibition protection. At this time, the fourth conducting member 50 is turned on, and the first conducting member 42, the second conducting member 46, and the third conducting member 48 are turned off. When the current temperature of the battery 116 is lower than the high-temperature charge and discharge prohibition protection threshold, the temperature change voltage is greater than the fourth voltage, and the protection trigger signal output by the output comparison terminal 22 of the comparator 16 is at a low level. When the current temperature of the battery 116 is higher than the high-temperature charge and discharge prohibition protection threshold, the temperature change voltage is less than the fourth voltage, and the protection trigger signal output by the output comparison terminal 22 of the comparator 16 is at a high level.

[0079] Please refer to Figure 2 and Figure 3 , in some embodiments, the temperature protection circuit 100 includes a sampling unit 60. The sampling unit 60 is connected to the protection trigger unit 14. The sampling unit 60 is configured to output a sampling signal according to the protection trigger signal when receiving a sampling detection signal.

[0080] In this way, the power consumption can be avoided from increasing due to continuous detection through sampling processing.

[0081] Specifically, in Figure 2 , the sampling unit 60 can be connected to the protection trigger unit 14. The temperature protection circuit 100 can send a sampling detection signal to the sampling unit 60. In one embodiment, when the sampling unit 60 receives a sampling detection signal, the protection trigger unit 14 can send a protection trigger signal to the sampling unit 60, and the sampling unit 60 can output a sampling signal according to the protection trigger signal. That is to say, through the sampling unit 60 for sampling processing, and then obtaining samples for detection in a certain time period, there is no need to continuously detect the entire temperature protection circuit 100, thereby avoiding the increase in power consumption due to continuous detection.

[0082] Please refer to Figure 3 , Figure 4 and Figure 6 , in some embodiments, the sampling unit 60 includes at least one sampling member 62. The sampling member 62 is connected to the protection trigger unit 14. Each sampling member 62 corresponds to a sampling detection signal. When the voltage generating unit 12 generates at least two detection voltages, the sampling unit 60 includes at least two sampling members 62, and each sampling member 62 corresponds to a detection voltage. The sampling unit 60 is configured to output a sampling signal according to the protection trigger signal through a corresponding sampling member 62 when determining one of the detection voltages in a preset order and receiving a sampling detection signal.

[0083] In this way, it is beneficial to reduce the complexity of component types and simplify the circuit layout.

[0084] Specifically, in Figure 4In [the figure], the sampling unit 60 is provided with four sampling components 62, and the four sampling components 62 can be respectively a first sampling component 64, a second sampling component 66, a third sampling component 68, and a fourth sampling component 70. In an embodiment, when the first gate terminal 52 is at a high level, the first conducting component 42 conducts, and the first voltage can be determined. The comparator 16 can output a protection trigger signal according to the comparison between the first voltage and the temperature-varying voltage and after the processing of the first inverter 24. The first sampling component 64 can output a sampling signal according to the received protection trigger signal and the sampling detection signal corresponding to the first sampling component 64. In an embodiment, when the second gate terminal 54 is at a high level, the second conducting component 46 conducts, and the second voltage can be determined. The comparator 16 can output a protection trigger signal according to the comparison between the second voltage and the temperature-varying voltage and after the processing of the first inverter 24. The second sampling component 66 can output a sampling signal according to the received protection trigger signal and the sampling detection signal corresponding to the second sampling component 66. In an embodiment, when the third gate terminal 56 is at a high level, the third conducting component 48 conducts, and the third voltage can be determined. The comparator 16 can output a protection trigger signal according to the comparison between the third voltage and the temperature-varying voltage. The third sampling component 68 can output a sampling signal according to the received protection trigger signal and the sampling detection signal corresponding to the third sampling component 68. In an embodiment, when the fourth gate terminal 58 is at a high level, the fourth conducting component 50 conducts, and the fourth voltage can be determined. The comparator 16 can output a protection trigger signal according to the comparison between the fourth voltage and the temperature-varying voltage. The fourth sampling component 70 can output a sampling signal according to the received protection trigger signal and the sampling detection signal corresponding to the fourth sampling component 70.

[0085] In addition, the sampling component 62 includes a trigger. The sampling component 62 has a first sampling input terminal 72, a second sampling input terminal 74, a sampling connection terminal 75, and a sampling output terminal 76. Please refer to Figure 6, in one embodiment, when the level of the first gate terminal 52 is low, the first conducting component 42 is disconnected, the first sampling component 64 can receive a corresponding sampling detection signal, the first sampling component 64 can be reset, the second sampling input terminal 74 of the first sampling component 64 can become low level, and the first sampling input terminal 72 of the first sampling component 64 is disconnected from the sampling output terminal 76 of the first sampling component 64. When the first sampling component 64 is reset, the sampling signal output by the sampling output terminal 76 of the first sampling component 64 is low level. In one embodiment, when the level of the first gate terminal 52 is high, the first conducting component 42 is conducting, and the first voltage can be compared with the temperature-varying voltage in the comparator 16. When the first voltage is less than the temperature-varying voltage, the level output by the output comparison terminal 22 is low level, and finally the protection trigger signal output by the output inverting terminal 26 is high level. The first sampling component 64 can receive a corresponding sampling detection signal. When the first gate terminal 52 is high, there can be a preset duration. The sampling connection terminal 75 of the first sampling component 64 can be connected to the first gate terminal 52. The second sampling input terminal 74 of the first sampling component 64 can change from low level to high level within the preset duration. The first sampling input terminal 72 of the first sampling component 64 can be connected to the output inverting terminal 26, and the level of the first sampling input terminal 72 of the first sampling component 64 can be high level. The first sampling input terminal 72 of the first sampling component 64 is conducting with the sampling output terminal 76 of the first sampling component 64, and the sampling signal output by the sampling output terminal 76 of the first sampling component 64 is high level.

[0086] In one embodiment, when the level of the second gate terminal 54 is low, the second conducting component 46 is turned off, the second sampling component 66 can receive a corresponding sampling detection signal, the second sampling component 66 can be reset, the second sampling input terminal 74 of the second sampling component 66 can become low level, and the first sampling input terminal 72 of the second sampling component 66 is disconnected from the sampling output terminal 76 of the second sampling component 66. When the second sampling component 66 is reset, the sampling signal output by the sampling output terminal 76 of the second sampling component 66 is low level. In one embodiment, when the level of the second gate terminal 54 is high, the second conducting component 46 is turned on, and the second voltage can be compared with the temperature-varying voltage in the comparator 16. When the second voltage is less than the temperature-varying voltage, the level output by the output comparison terminal 22 is low level, and finally the protection trigger signal output by the output inverting terminal 26 is high level. The second sampling component 66 can receive a corresponding sampling detection signal. When the second gate terminal 54 is high, there can be a preset duration. The sampling connection terminal 75 of the second sampling component 66 can be connected to the second gate terminal 54. The second sampling input terminal 74 of the second sampling component 66 can change from low level to high level within the preset duration. The first sampling input terminal 72 of the second sampling component 66 can be connected to the output inverting terminal 26, and the level of the first sampling input terminal 72 of the second sampling component 66 can be high level. The first sampling input terminal 72 of the second sampling component 66 is turned on with the sampling output terminal 76 of the first sampling component 64, and the sampling signal output by the sampling output terminal 76 of the second sampling component 66 is high level.

[0087] In one embodiment, when the level of the third gate terminal 56 is low, the third conducting component 48 is turned off, the third sampling component 68 can receive a corresponding sampling detection signal, the third sampling component 68 can be reset, the second sampling input terminal 74 of the third sampling component 68 can become low level, and the first sampling input terminal 72 of the third sampling component 68 is disconnected from the sampling output terminal 76 of the third sampling component 68. When the third sampling component 68 is reset, the sampling signal output by the sampling output terminal 76 of the third sampling component 68 is low level. In one embodiment, when the level of the third gate terminal 56 is high, the third conducting component 48 is turned on, and the third voltage can be compared with the temperature-varying voltage in the comparator 16. When the third voltage is greater than the temperature-varying voltage, the protection trigger signal finally output through the output comparison terminal 22 is high level. The third sampling component 68 can receive a corresponding sampling detection signal. When the third gate terminal 56 is high, there can be a preset duration. The sampling connection terminal 75 of the third sampling component 68 can be connected to the third gate terminal 56. The second sampling input terminal 74 of the third sampling component 68 can change from low level to high level within the preset duration. The first sampling input terminal 72 of the third sampling component 68 can be connected to the output comparison terminal 22, and the level of the first sampling input terminal 72 of the third sampling component 68 can be high level. The first sampling input terminal 72 of the third sampling component 68 is turned on with the sampling output terminal 76 of the third sampling component 68, and the sampling signal output by the sampling output terminal 76 of the third sampling component 68 is high level.

[0088] In one embodiment, when the level of the fourth gate terminal 58 is low, the fourth conducting component 50 is turned off, and the fourth sampling component 70 can receive a corresponding sampling detection signal. The fourth sampling component 70 can be reset, the second sampling input terminal 74 of the fourth sampling component 70 can become low level, and the first sampling input terminal 72 of the fourth sampling component 70 is disconnected from the sampling output terminal 76 of the fourth sampling component 70. When the fourth sampling component 70 is reset, the sampling signal output by the sampling output terminal 76 of the fourth sampling component 70 is low level. In one embodiment, when the level of the fourth gate terminal 58 is high, the fourth conducting component 50 is turned on, and the fourth voltage can be compared with the temperature-variable voltage in the comparator 16. When the fourth voltage is greater than the temperature-variable voltage, the protection trigger signal finally output through the output comparison terminal 22 is high level. The fourth sampling component 70 can receive a corresponding sampling detection signal. When the fourth gate terminal 58 is high, there can be a preset duration. The sampling connection terminal 75 of the fourth sampling component 70 can be connected to the fourth gate terminal 58. The second sampling input terminal 74 of the fourth sampling component 70 can change from low level to high level within the preset duration. The first sampling input terminal 72 of the fourth sampling component 70 can be connected to the output comparison terminal 22, and the level of the first sampling input terminal 72 of the fourth sampling component 70 can be high level. The first sampling input terminal 72 of the fourth sampling component 70 is conducted with the sampling output terminal 76 of the fourth sampling component 70, and the sampling signal output by the sampling output terminal 76 of the fourth sampling component 70 is high level.

[0089] Please combine Figure 2 and Figure 4 , in some embodiments, the temperature protection circuit 100 includes a logic processing unit 78. The logic processing unit 78 is configured to receive the sampling signals output by at least two sampling components 62 and generate a protection action signal. The level state of the protection action signal corresponds to the level state of the protection trigger signal.

[0090] In this way, it is beneficial to reduce the number of lines.

[0091] Specifically, in one embodiment, the logic processing unit 78 can receive the sampling signals output by the first sampling component 64 and the second sampling component 66 and generate a protection action signal. In one embodiment, the logic processing unit 78 can receive the sampling signals output by the third sampling component 68 and the fourth sampling component 70 and generate a protection action signal. In one embodiment, the logic processing unit 78 can receive the sampling signals output by the first sampling component 64, the second sampling component 66, the third sampling component 68, and the fourth sampling component 70 and generate a protection action signal. That is to say, through the processing efficiency of the logic processing unit 78, it is beneficial to reduce the number of lines.

[0092] Since the level of the sampling signal is consistent with the level of the protection trigger signal, and the level of the protection action signal is consistent with the level of the sampling signal, the level of the protection action signal can be made consistent with the level of the protection trigger signal. In one embodiment, when the level of the protection trigger signal is low, the level of the protection action signal is low. In one embodiment, when the level of the protection trigger signal is high, the level of the protection action signal is high.

[0093] Please combine Figure 4 and Figure 5 , in some embodiments, the logic processing unit 78 includes at least one logic processing subunit 80. Each logic processing subunit 80 is configured to receive the sampling signals output from a corresponding part of at least two sampling elements 62 and generate a corresponding protection action signal.

[0094] In this way, the processing efficiency can be further improved and the number of lines can be reduced.

[0095] Specifically, in Figure 5 , the logic processing unit 78 is provided with two logic processing subunits 80. The two logic processing subunits 80 can be the first subunit 82 and the second subunit respectively. In one embodiment, one logic processing subunit 80 can receive the sampling signals output from a corresponding part of the first sampling element 64 and the fourth sampling element 70 and generate a corresponding protection action signal. In one embodiment, one logic processing subunit 80 can receive the sampling signals output from a corresponding part of the second sampling element 66 and the third sampling element 68 and generate a corresponding protection action signal.

[0096] The logic processing subunit 80 has a first logic processing input terminal 86, a second logic processing input terminal 88, and a logic processing output terminal 90. The logic processing unit 78 further includes a second inverter 92. The second inverter 92 has an inverted output terminal 94. In one embodiment, the sampling output terminal 76 of the first sampling member 64 can be connected to the second logic processing input terminal 88 of the second subunit. The sampling output terminal 76 of the fourth sampling member 70 can be connected to the first logic processing input terminal 86 of the second subunit. After the sampling signals corresponding to a part of the outputs of the first sampling member 64 and the fourth sampling member 70 are processed by the second subunit logic, a corresponding protection action signal can be output through the logic processing output terminal 90 of the second subunit. The logic processing output terminal 90 of the second subunit is connected to the second inverter 92, and the protection action signal is output from the inverted output terminal 94 after being processed by the second inverter 92. In one embodiment, the sampling output terminal 76 of the second sampling member 66 can be connected to the second logic processing input terminal 88 of the first subunit 82. The sampling output terminal 76 of the third sampling member 68 can be connected to the first logic processing input terminal 86 of the first subunit 82. After the sampling signals corresponding to a part of the outputs of the second sampling member 66 and the third sampling member 68 are processed by the first subunit 82 logic, a corresponding protection action signal can be output through the logic processing output terminal 90 of the first subunit 82. The logic processing output terminal 90 of the first subunit 82 is connected to the second inverter 92, and the protection action signal is output from the inverted output terminal 94 after being processed by the second inverter 92.

[0097] In addition, in one embodiment, when the sampling output terminals 76 of both the second sampling member 66 and the third sampling member 68 are at low level, after being processed by the first subunit 82 and then delivered to the second inverter 92, the level finally output from the inverted output terminal 94 is at low level. In one embodiment, when the sampling output terminal 76 of the second sampling member 66 is at high level or the sampling output terminal 76 of the third sampling member 68 is at high level, after being processed by the first subunit 82 and then delivered to the second inverter 92, the level finally output from the inverted output terminal 94 is at high level. In one embodiment, when the sampling output terminals 76 of both the first sampling member 64 and the fourth sampling member 70 are at low level, after being processed by the second subunit and then delivered to the second inverter 92, the level finally output from the inverted output terminal 94 is at low level. In one embodiment, when the sampling output terminal 76 of the first sampling member 64 is at high level or the sampling output terminal 76 of the fourth sampling member 70 is at high level, after being processed by the second subunit and then delivered to the second inverter 92, the level finally output from the inverted output terminal 94 is at high level.

[0098] Please refer Figure 1 and Figure 5, a protection chip 200 according to an embodiment of the present invention is used for over-temperature protection of the battery 116. The protection chip 200 includes the temperature protection circuit 100 and the logic control circuit 102 of any one of the above embodiments. The logic control circuit 102 is used to generate a drive signal according to a protection trigger signal. The drive signal is used to perform an over-temperature protection operation. The over-temperature protection actions include an over-temperature charging protection action and an over-temperature charge-discharge protection action. When it is determined to perform the over-temperature charging protection action, the protection chip 200 is configured to disconnect the path for supplying power from the conductive terminal 114 to the battery 116. When it is determined to perform the over-temperature charge-discharge protection action, the protection chip 200 is configured to disconnect the path for supplying power from the conductive terminal 114 to the battery 116 and the path for supplying power from the battery 116 to the conductive terminal 114.

[0099] The above protection chip 200 obtains a protection trigger signal through a temperature-variable voltage and a generated detection voltage. Since the temperature-variable voltage corresponds to the current temperature of the battery 116, the protection trigger signal can be used to reflect whether the current temperature of the battery 116 is at a level that requires over-temperature protection. Moreover, different detection voltages can be generated by the voltage generation unit 12, and there is no need to repeatedly set the entire circuit structure to implement different temperature protection functions, thus simplifying the circuit structure and being beneficial to reducing power consumption and size area.

[0100] Specifically, the protection chip 200 further includes a CO port 104 and a DO port 106. In one embodiment, when it is determined to perform the over-temperature charging protection action, the CO port 104 outputs a low level and the DO port 106 outputs a high level. The protection chip 200 can disconnect the path for supplying power from the conductive terminal 114 to the battery 116, thereby implementing over-temperature charging prohibition protection. In one embodiment, when it is determined to perform the over-temperature charge-discharge protection action, the CO port 104 outputs a low level and the DO port 106 outputs a low level. The protection chip 200 can disconnect the path for supplying power from the conductive terminal 114 to the battery 116 and the path for supplying power from the battery 116 to the conductive terminal 114, thereby implementing over-temperature charge-discharge prohibition protection.

[0101] In addition, in another embodiment, when both the CO port 104 and the DO port 106 output high levels, the protection chip 200 can connect the path for supplying power from the conductive terminal 114 to the battery 116 and the path for supplying power from the battery 116 to the conductive terminal 114, and the battery 116 can be charged and discharged.

[0102] A drive circuit 300 according to an embodiment of the present invention is used for over-temperature protection of the battery 116. The drive circuit 300 includes the protection chip 200 and the control conduction part 108 of the above embodiment. The control conduction part 108 is connected to the protection chip 200 and the battery 116. When it is determined to perform the over-temperature charging protection action, the protection chip 200 is used to drive the control conduction part 108 to disconnect the path for supplying power from the conductive end 114 to the battery 116. When it is determined to perform the over-temperature charge and discharge protection action, the protection chip 200 is used to drive the control conduction part 108 to disconnect the path for supplying power from the conductive end 114 to the battery 116 and the path for supplying power from the battery 116 to the conductive end 114.

[0103] For the above drive circuit 300, a protection trigger signal is obtained through the temperature-variable voltage and the generated detection voltage. Since the temperature-variable voltage corresponds to the current temperature of the battery 116, it is possible to reflect whether the current temperature of the battery 116 is at a level that requires over-temperature protection through the protection trigger signal, and different detection voltages can be generated by the voltage generation unit 12, without the need to repeatedly set the entire circuit structure to implement different temperature protection functions, thereby simplifying the circuit structure and being beneficial to reducing power consumption and size area.

[0104] Specifically, the control conduction part 108 includes a first switch tube 110 and a second switch tube 112. The first switch tube 110 is connected to the conductive end 114. The first switch tube 110 is connected to the second switch tube 112. The second switch tube 112 is connected to the battery 116. The first switch tube 110 and the second switch tube 112 are connected to the protection chip 200. In one embodiment, when it is determined to perform the over-temperature charging protection action, the protection chip 200 can control the first switch tube 110 to conduct and the second switch tube 112 to disconnect, thereby disconnecting the path for supplying power from the conductive end 114 to the battery 116, and thus realizing over-temperature prohibited charging protection. In one embodiment, when it is determined to perform the over-temperature charge and discharge protection action, the protection chip 200 can control the first switch tube 110 and the second switch tube 112 to disconnect, thereby disconnecting the path for supplying power from the conductive end 114 to the battery 116 and the path for supplying power from the battery 116 to the conductive end 114, and thus realizing over-temperature prohibited charge and discharge protection.

[0105] Please refer Figure 1 to, a power supply device 400 according to an embodiment of the present invention includes a battery 116 and the drive circuit 300 of the above embodiment. The drive circuit 300 is connected to the battery 116.

[0106] The above-mentioned power supply device 400 obtains a protection trigger signal through the temperature-variable voltage and the generated detection voltage. Since the temperature-variable voltage corresponds to the current temperature of the battery 116, the protection trigger signal can be used to reflect whether the current temperature of the battery 116 is at a level that requires over-temperature protection. Moreover, different detection voltages can be generated by the voltage generation unit 12, eliminating the need to repeatedly set up the entire circuit structure to achieve different temperature protection functions, thus simplifying the circuit structure and facilitating power consumption and size reduction.

[0107] Specifically, the power supply device 400 further includes a main body (not shown in the figure). The battery 116 and the drive circuit 300 can be disposed within the main body. When the power supply device 400 charges and discharges to the outside, the conduction path from the conductive end 114 to the battery 116 and the disconnection of the conduction path from the battery 116 to the conductive end 114 can be controlled by controlling the conduction part 108, thereby realizing over-temperature charging prohibition protection and over-temperature charge and discharge prohibition protection.

[0108] In addition, the main body further includes a charge pump 118, a drive circuit 124, an over-current protection circuit 120, and a voltage detection circuit 122. The charge pump 118 can boost the voltage of the battery 116 and is used to supply power to the drive circuit 124 so that it can turn on the first switch tube 110 and the second switch tube 112 for charging and discharging. The voltage of the drive circuit 124 comes from the charge pump 118. The drive circuit 124 can control the outputs of the CO port 104 and the DO port 106 to protect the charging and discharging of the power supply device 400 by receiving the output of the logic control circuit 102. The over-current protection circuit 120 can be used to monitor the magnitude of the charging and discharging current of the power supply device 400 by detecting the pressure difference of the detection resistor 126, and when the charging and discharging current is too large, the charging and discharging protection of the power supply device 400 is achieved through the logic control circuit 102. The voltage detection circuit 122 can achieve overcharge and over-discharge protection of the battery 116 by detecting the voltage magnitude of the battery 116.

[0109] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0110] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A temperature protection circuit for over-temperature protection of a battery, characterized in that, the temperature protection circuit includes: a voltage generation unit for generating at least one detection voltage; and a protection trigger unit connected to a temperature-variable resistor. The temperature-variable resistor is used to generate a temperature-variable voltage and can change the temperature-variable voltage according to the current temperature of the battery. The protection trigger unit is used to output a protection trigger signal according to the temperature-variable voltage and at least one of the detection voltages, and the protection trigger signal is used to determine whether an over-temperature protection action is generated; when the voltage generation unit generates at least two of the detection voltages, the at least two detection voltages respectively correspond to different voltage values, and the protection trigger unit is configured to output the protection trigger signal according to the temperature-variable voltage and one of the detection voltages determined in a preset order; and a sampling unit connected to the protection trigger unit. The sampling unit is used to output a sampling signal according to the protection trigger signal when receiving a sampling detection signal; wherein, the sampling unit includes: at least one sampling component connected to the protection trigger unit, and each sampling component corresponds to one of the sampling detection signals; when the voltage generation unit generates at least two of the detection voltages, the sampling unit includes at least two of the sampling components, and each sampling component corresponds to one of the detection voltages; the sampling unit is configured to, when determining one of the detection voltages in the preset order and receiving one of the sampling detection signals, output the sampling signal through a corresponding one of the sampling components according to the protection trigger signal.

2. The temperature protection circuit according to claim 1, characterized in that, the voltage generation unit includes: at least two voltage-dividing resistor components, the at least two voltage-dividing resistor components are connected in series in sequence to form a voltage-dividing branch, and a voltage-dividing point is formed at the position between two adjacent voltage-dividing resistor components; both ends of the voltage-dividing branch are respectively connected to a high-voltage end and a low-voltage end, and a potential difference is formed between the high-voltage end and the low-voltage end so that a corresponding one of the detection voltages is generated at the voltage-dividing point.

3. The temperature protection circuit according to claim 2, characterized in that, the temperature protection circuit includes: a voltage selection unit including at least one selection conduction component. The selection conduction component is connected to the protection trigger unit and a corresponding one of the voltage-dividing points, and the selection conduction component is used to selectively conduct or cut off the protection trigger unit and a corresponding one of the voltage-dividing points; when the voltage selection unit includes at least two selection conduction components, the at least two selection conduction components are configured to conduct the protection trigger unit and a corresponding one of the voltage-dividing points in a preset order in sequence and maintain the corresponding duration, and make the protection trigger unit only connected to one of the voltage-dividing points.

4. The temperature protection circuit according to claim 1, characterized in that, the temperature protection circuit includes: A logic processing unit, configured to receive the sampling signals output by at least two of the sampling components and generate a protection action signal, the level state of the protection action signal corresponding to the level state of the protection trigger signal.

5. The temperature protection circuit according to claim 4, wherein, the logic processing unit includes: at least one logic processing sub-unit, each logic processing sub-unit being configured to receive the sampling signals output by a corresponding part of at least two of the sampling components and generate a corresponding one of the protection action signals.

6. A protection chip, configured to perform over-temperature protection on a battery, wherein, the protection chip includes: the temperature protection circuit according to any one of claims 1-5; and a logic control circuit, configured to generate a drive signal according to the protection trigger signal, the drive signal being used to perform an over-temperature protection operation; the over-temperature protection actions include over-temperature charging protection actions and over-temperature charge-discharge protection actions. In the case of determining to perform the over-temperature charging protection action, the protection chip is configured to disconnect the path for supplying power from the conductive terminal to the battery. In the case of determining to perform the over-temperature charge-discharge protection action, the protection chip is configured to disconnect the path for supplying power from the conductive terminal to the battery and the path for supplying power from the battery to the conductive terminal.

7. A drive circuit, configured to perform over-temperature protection on a battery, wherein, the drive circuit includes: the protection chip according to claim 6; and a control conduction part, the control conduction part being connected to the protection chip and the battery; In the case of determining to perform the over-temperature charging protection action, the protection chip is used to drive the control conduction part to disconnect the path for supplying power from the conductive terminal to the battery. In the case of determining to perform the over-temperature charge-discharge protection action, the protection chip is used to drive the control conduction part to disconnect the path for supplying power from the conductive terminal to the battery and the path for supplying power from the battery to the conductive terminal.

8. A power supply device, wherein, it includes: a battery; and the drive circuit according to claim 7, the drive circuit being connected to the battery.

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