CN116053659A - Heating control circuit and battery pack - Google Patents

Abstract

The invention provides a heating control circuit and a battery pack, wherein the heating control circuit mainly comprises a first temperature acquisition module, a temperature judgment module, an oscillation suppression module, a heating control module and a heating module, wherein the first temperature acquisition module is used for outputting a first real-time voltage, the temperature judgment module is respectively and electrically connected with the first temperature acquisition module and a reference voltage end, the oscillation suppression module is respectively and electrically connected with the first temperature acquisition module and the temperature judgment module, the heating control module is respectively and electrically connected with the temperature judgment module and a first heating driving voltage end, and the heating module is electrically connected with the heating control module. Through setting up shock suppression module, avoid first real-time voltage and reference voltage to appear the condition that the size is close and lead to heating control module to start repeatedly, ensure heating module normal operating.

Description

Heating control circuit and battery pack

Technical Field

The invention relates to the technical field of battery heating control, in particular to a heating control circuit and a battery pack.

Background

There is still a wide room for improvement in battery thermal management technology, whether in the automotive or aviation industries, and particularly in low-temperature environments, battery thermal management technology is attracting much attention from the industry. The reason for this is that under the low temperature condition, the activity of the internal substances of the battery is greatly reduced, so that the battery is difficult to provide enough voltage for the power utilization terminal, and the normal operation of the power utilization terminal is affected. Therefore, in order to ensure the normal operation of the power end, the battery in the low-temperature environment needs to be correspondingly heated.

In the related art, the heating control of the low-temperature battery is realized by using a pure hardware circuit, and some factors which cannot realize stable heating still exist. The reason for this is mainly that the pure hardware circuit cannot accurately determine the temperature threshold value of the heating start, so that the heating control circuit repeatedly oscillates in the heating start and heating stop processes, and core components including the battery cannot work based on the working temperature, so that the normal work of the power utilization terminal is affected.

Therefore, the above problems are in need of treatment.

Disclosure of Invention

The embodiment of the invention provides a heating control circuit and a battery pack, which can avoid the occurrence of heating oscillation and ensure that heating components can work normally in a low-temperature environment.

In a first aspect, an embodiment of the present invention provides a heating control circuit including:

the first temperature acquisition module is used for outputting a first real-time voltage, and the first real-time voltage changes based on the change of the real-time temperature;

the temperature judging module is electrically connected with the first temperature collecting module and the reference voltage end respectively and is used for outputting a second real-time voltage based on the first real-time voltage and the reference voltage output by the reference voltage end;

The oscillation suppression module is electrically connected with the first temperature acquisition module and the temperature judgment module respectively, and is used for adjusting the first real-time voltage based on the second real-time voltage;

the heating control module is electrically connected with the temperature judging module and the first heating driving voltage end respectively, and is used for outputting the first heating driving voltage provided by the first heating driving voltage end based on the second real-time voltage;

the heating module is electrically connected with the heating control module and is used for heating based on the first heating driving voltage.

In an embodiment, the first temperature sampling module includes a first temperature sensing unit and a first sampling unit;

the first end of the first temperature-sensitive unit is electrically connected with a first power supply end, and the second end of the first temperature-sensitive unit is electrically connected with the temperature judging module, the first end of the first sampling unit and the oscillation suppression module respectively; the first temperature-sensitive unit is used for detecting the change of the real-time temperature;

the second end of the first sampling unit is electrically connected with the grounding end, and the first sampling unit is used for outputting a first real-time voltage based on the real-time temperature change.

In one embodiment, the temperature determination module includes a comparator;

the first input end of the comparator is electrically connected with the reference voltage end, the second input end of the comparator is electrically connected with the first temperature acquisition module, and the output end of the comparator is electrically connected with the heating control module.

In an embodiment, the oscillation suppression module includes a second sampling unit, a switch unit, and a voltage division unit;

the second sampling unit is electrically connected with the temperature judging module, the switch unit and the grounding end respectively, and is used for collecting the second real-time voltage and outputting a third real-time voltage to the switch unit according to the second real-time voltage;

the switch unit is respectively and electrically connected with the voltage dividing unit and the first temperature acquisition module, and is used for controlling the on-off state of the voltage dividing unit based on the third real-time voltage;

the voltage dividing unit is electrically connected with the first temperature sampling module and is used for adjusting the first real-time voltage.

In an embodiment, the second sampling unit includes a first sampling resistor, a second sampling resistor, and a first capacitor;

The first end of the first sampling resistor is electrically connected with the temperature judging module, and the second end of the first sampling resistor is electrically connected with the first end of the second sampling resistor and the switch unit respectively;

the second end of the second sampling resistor is electrically connected with the grounding end;

the first end of the first capacitor is electrically connected with the first end of the second sampling resistor, and the second end of the first capacitor is electrically connected with the second end of the second sampling resistor.

In an embodiment, the switching unit comprises a first switching tube;

the grid electrode of the first switching tube is electrically connected with the second sampling unit, one of the source electrode and the drain electrode of the first switching tube is electrically connected with the voltage dividing unit, and the other of the source electrode and the drain electrode of the first switching tube is electrically connected with the first temperature sampling module.

In one embodiment, the voltage dividing unit includes at least one voltage dividing resistor;

the first end of the voltage dividing resistor is electrically connected with the first temperature sampling module, and the second end of the voltage dividing resistor is electrically connected with the switch unit.

In one embodiment, the heating control module comprises a second switching tube and a third switching tube;

the grid electrode of the second switching tube is electrically connected with the temperature judging module, one of the source electrode and the drain electrode of the second switching tube is electrically connected with the grounding end, and the other of the source electrode and the drain electrode of the second switching tube is electrically connected with the grid electrode of the third switching tube;

One of a source electrode and a drain electrode of the third switching tube is electrically connected with the first heating driving voltage end, and the other of the source electrode and the drain electrode of the third switching tube is electrically connected with the heating module.

In one embodiment, the heating control circuit further comprises a microprocessor module;

the micro-processing module is respectively and electrically connected with the heating control module and the heating module, and is used for providing a second heating driving voltage for the heating module based on the second real-time voltage;

the heating module heats based on the second heating driving voltage.

In an embodiment, the heating control circuit further includes a second temperature acquisition module;

the second temperature acquisition module is connected with the micro-processing module and is used for outputting a fourth real-time voltage, and the fourth real-time voltage changes based on the change of the real-time temperature;

the micro-processing module provides the second heating driving voltage to the heating module based on the fourth real-time voltage.

In one embodiment, the battery pack heating control circuit further comprises a communication module;

the communication module is electrically connected with the micro-processing module, and is used for carrying out information interaction with the outside based on the second real-time voltage and the fourth real-time voltage.

In an embodiment, the heating control circuit further comprises a power supply module;

the power supply module is electrically connected with the first temperature collecting module, the temperature judging module, the reference voltage end and the first heating driving voltage end respectively, and the power supply module is used for providing corresponding voltages for the first temperature collecting module, the temperature judging module, the reference voltage end and the first heating driving voltage end respectively.

In a second aspect, embodiments of the present invention provide a battery pack including a battery body and any one of the heating control circuits of the foregoing embodiments.

The embodiment of the invention has the beneficial effects that:

in the embodiment of the invention, the oscillation suppression module is arranged in the heating control circuit, so that the heating control module is prevented from being repeatedly started due to the condition that the first real-time voltage and the reference voltage are close in size, and the normal operation of the heating module is prevented from being influenced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a first configuration of a heating control circuit according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a second configuration of a heating control circuit according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a third configuration of a heating control circuit according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a fourth configuration of a heating control circuit according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a fifth configuration of a heating control circuit according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a sixth configuration of a heating control circuit according to an embodiment of the present invention;

fig. 7 is a seventh structural schematic diagram of a heating control circuit provided by an embodiment of the present invention;

fig. 8 is a schematic diagram of an eighth configuration of a heating control circuit provided by an embodiment of the present invention;

FIG. 9 is a schematic circuit diagram of a heating control circuit according to an embodiment of the present invention;

fig. 10 is a ninth structural schematic diagram of a heating control circuit provided by an embodiment of the present invention;

fig. 11 is a schematic view of a tenth configuration of a heating control circuit provided by an embodiment of the present invention;

fig. 12 is an eleventh structural schematic diagram of a heating control circuit provided by an embodiment of the present invention;

Fig. 13 is a twelfth structural diagram of a heating control circuit according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and description only, and is not intended to limit the invention.

Referring to fig. 1, fig. 1 is a schematic diagram of a first structure of a heating control circuit according to an embodiment of the invention. As shown in fig. 1, the heating control circuit 100 includes a first temperature sampling module 10, a temperature judging module 20, a heating control module 30, a heating module 40, and an oscillation suppression module 50. Specifically, the temperature judging module 20 is electrically connected to the first temperature collecting module 10 and the reference voltage terminal Vref, the oscillation suppressing module 50 is electrically connected to the first temperature collecting module 10 and the temperature judging module 20, the heating control module 30 is electrically connected to the temperature judging module 20 and the first heating driving voltage terminal Ven1, and the heating module 40 is electrically connected to the heating control module 30.

The first temperature sampling module 10 is configured to output a first real-time voltage, where the first real-time voltage changes based on a change of a real-time temperature. It should be appreciated that the first temperature acquisition module 10 is capable of detecting a real-time temperature of a specific object and converting the detected real-time temperature into a first real-time voltage. The specific object may be a battery or a circuit board (Printed Circuit Board, PCB) of a battery management system.

The temperature determining module 20 is configured to output a second real-time voltage based on the first real-time voltage and the reference voltage output by the reference voltage terminal Ven 1. It should be appreciated that the voltage value of the second real-time voltage outputted by the temperature determining module 20 is determined by the voltage value of the reference voltage and the voltage value of the first real-time voltage.

The oscillation suppression module 50 is configured to adjust the first real-time voltage based on the second real-time voltage, so as to adjust a voltage value difference between the first real-time voltage and the reference voltage, and avoid the oscillation of the temperature judgment module 20 when the voltage values of the first real-time voltage and the reference voltage are close to each other, so that the heating control module 30 is repeatedly started, and the normal operation of the heating module is further affected.

The heating control module 30 is configured to output the first heating driving voltage provided by the first heating driving voltage terminal Ven1 to the heating module 40 based on the second real-time voltage output by the temperature determining module 20. It should be appreciated that whether the first heating driving voltage terminal Ven1 outputs the first heating driving voltage to the heating module 40 depends on the voltage value of the second real-time voltage.

Wherein the heating module 40 is used for heating based on the first heating driving voltage. It should be appreciated that the heating module 40 heats the specific object of the first temperature acquisition module 10 based on the first heating driving voltage, so as to ensure that the specific object can work normally in a low temperature environment. The heating module 40 may be embodied as a heating plate, an integrated circuit, which converts electric energy into heat energy.

In the heating control circuit provided by the embodiment, through setting up the vibration suppression module, the condition that voltage value size is close appears in first real-time voltage and reference voltage to can avoid heating control module to start repeatedly and take place to vibrate, and then guarantee heating module normal operating.

In an embodiment provided in the present application, please refer to fig. 2, fig. 2 is a schematic diagram of a second structure of a heating control circuit according to an embodiment of the present invention. As shown in fig. 2, the difference between the present embodiment and the foregoing embodiment is that, in the heating control circuit 100 provided in the present embodiment, the first temperature sensing module 10 includes a first temperature sensing unit 101 and a first sampling unit 102.

Specifically, the first end of the first temperature-sensitive unit 101 is electrically connected to the first power supply end, and the second end of the first temperature-sensitive unit 101 is electrically connected to the first ends of the temperature determining module 20 and the first sampling unit 102, respectively. A second terminal of the first sampling unit 102 is electrically connected to a ground terminal. That is, the first temperature-sensitive unit 101 and the first sampling unit 102 are serially connected between the first power supply terminal V1 and the ground terminal.

The first temperature-sensitive unit 101 is configured to detect a real-time temperature change, that is, the first temperature-sensitive unit 101 may be configured to detect a real-time temperature change of a battery, a circuit board, or other circuit components, and convert the real-time temperature change into an electrical signal change.

Specifically, the first temperature-sensitive unit 101 may be a temperature-sensitive resistor. The temperature-sensitive resistor may have different resistance values at different temperatures, and in the case that the voltage provided by the first power supply terminal V1 is a constant voltage, the temperature-sensitive resistor may change the voltage drop between the first terminal of the first temperature-sensitive unit 101 and the second terminal of the first temperature-sensitive unit 101 based on the change of the self resistance value. Therefore, the temperature-sensitive resistor can convert the temperature change into the voltage-dividing parameter change of the temperature-sensitive resistor in the circuit, so that the voltage-dividing parameter of the first sampling unit 102 in the circuit correspondingly changes, and the first real-time voltage output by the first sampling unit 102 changes based on the real-time temperature change. Correspondingly, the first temperature-sensitive unit 101 may also be a temperature sampling element such as a resistance temperature detector, an integrated circuit temperature sensor, etc. Therefore, the specific temperature sensing element of the first temperature sensing unit 101 can be selected according to the actual requirement.

The voltage at the first end of the first sampling unit 102 is a first real-time voltage.

Specifically, the first sampling unit 102 may include at least one sampling resistor to output the first real-time voltage to the temperature determination module 20. When the first sampling unit 102 includes a plurality of sampling resistors, the plurality of sampling resistors may be connected in series or in parallel. The equivalent resistance of the first sampling unit 102 can be set based on the sampling resistors according to actual requirements, and the number of the sampling resistors, the resistance of the corresponding sampling resistors and the connection relation between the sampling resistors are set.

In order to ensure that the first sampling unit 102 outputs a stable first real-time voltage, a temperature sampling voltage stabilizing capacitor may be disposed in the first temperature sampling module 10, so that a first end of the temperature sampling voltage stabilizing capacitor is electrically connected to a first end of the first temperature sensitive unit 101, and a second end of the temperature sampling voltage stabilizing capacitor is electrically connected to a second end of the first temperature sensitive unit 101.

In an embodiment provided in the present application, please refer to fig. 3, fig. 3 is a schematic diagram of a third structure of a heating control circuit according to an embodiment of the present invention. As shown in fig. 3, the present embodiment differs from the foregoing embodiment in that, in the heating control circuit 100 provided in the present embodiment, the temperature judgment module 20 includes a comparator U1. The first input end of the comparator U1 is electrically connected with the reference voltage end Vref, the second input end of the comparator U1 is electrically connected with the first temperature acquisition module 10, and the output end of the comparator U1 is electrically connected with the heating control module 30.

The comparator U1 compares the voltage of the first input terminal with the voltage of the second input terminal, and outputs a second real-time voltage to the output terminal based on the comparison result. Specifically, as shown in fig. 3, the first input end of the comparator U1 is a positive phase input end, the second input end of the comparator U1 is a negative phase input end, and if the voltage of the positive phase input end is greater than the voltage of the negative phase input end, the second real-time voltage output by the output end of the comparator U1 is a high level voltage; if the voltage of the positive phase input terminal is smaller than the voltage of the negative phase input terminal, the second real-time voltage output by the output terminal of the comparator U1 is a low-level voltage. The voltage value of the second real-time voltage is variable, and the heating control module 30 and the oscillation suppression module 50 can adjust the operating state based on the changed second real-time voltage.

The comparator U1 is further electrically connected to a power supply terminal Vop and a ground terminal, where the power supply terminal Vop is used for providing a working voltage required by the comparator U1.

It should be noted that fig. 3 only illustrates that the first input terminal of the comparator U1 is a positive phase input terminal, and the second input terminal of the comparator U1 is a negative phase input terminal. Based on the technical conception of the present embodiment, a person skilled in the art may select one of the first input terminal and the second input terminal as the normal phase input terminal according to the actual situation.

It should be noted that, in the temperature determining module 20 of the present embodiment, at least one resistor may be further disposed between the first input terminal of the comparator U1 and the reference voltage terminal Vref to divide the reference voltage provided by the reference voltage terminal Vref, so as to avoid the reference voltage from being excessively large. In order to ensure that the reference voltage terminal Vref provides stable reference voltage, a voltage stabilizing capacitor can be arranged at the reference voltage terminal Vref, so that one end of the voltage stabilizing capacitor is electrically connected with the reference voltage terminal Vref, and the other end of the voltage stabilizing capacitor is electrically connected with the grounding terminal.

Correspondingly, at least one resistor can be further arranged between the second input end of the comparator U1 and the first temperature acquisition module 10 so as to divide the first real-time voltage provided by the first temperature acquisition module 10 and avoid overlarge first real-time voltage.

Correspondingly, a voltage stabilizing capacitor can be further arranged at the comparator power supply end Vop of the comparator U1, one end of the voltage stabilizing capacitor is electrically connected with the comparator power supply end Vop, and the other end of the voltage stabilizing capacitor is electrically connected with the grounding end, so that stable working voltage is provided by the comparator power supply end Vop.

In an embodiment provided in the present application, please refer to fig. 4, fig. 4 is a schematic diagram of a fourth structure of a heating control circuit according to an embodiment of the present invention. As shown in fig. 4, the difference between the present embodiment and the foregoing embodiment is that, in the heating control circuit 100 provided in the present embodiment, the oscillation suppression module 50 includes a second sampling unit 501, a switching unit 502, and a voltage dividing unit 503.

The second sampling unit 501 is electrically connected to the temperature determining module 20, the switching unit 502, and the ground terminal, respectively. The second sampling unit 501 is configured to collect a second real-time voltage, and output a third real-time voltage to the switching unit 502 according to the second real-time voltage.

The switch unit 502 is electrically connected to the voltage dividing unit 503 and the first temperature sampling module 10. The switching unit 502 is configured to control the on-off state of the voltage dividing unit 503 based on the third real-time voltage provided by the second sampling unit 501. It should be appreciated that whether the voltage dividing unit 503 is in the on-state or the off-state depends on the response of the switching unit 502 based on the third real-time voltage.

The voltage dividing unit 503 is electrically connected to the first temperature sampling module 10. The voltage dividing unit 503 is used for adjusting the first real-time voltage.

Specifically, referring to fig. 5, fig. 5 is a schematic diagram of a fifth structure of a heating control circuit according to an embodiment of the present invention. As shown in fig. 5, the second sampling unit 501 includes a first sampling resistor R1, a second sampling resistor R2, and a first capacitor C51.

The first end of the first sampling resistor R1 is electrically connected to the temperature judging module 20, and the second end of the first sampling resistor R1 is electrically connected to the first end of the second sampling resistor R2 and the switching unit 502, respectively.

The second end of the second sampling resistor R2 is electrically connected with the grounding end. Therefore, the first sampling resistor R1 and the second sampling resistor R2 are serially connected between the temperature judging module 20 and the ground terminal, and the voltage at the first terminal of the second sampling resistor R2 is the third real-time voltage. Since the first sampling resistor R1 and the second sampling resistor R2 are both constant-value resistors, the voltage at the second sampling resistor R2 changes based on the change of the second real-time voltage, that is, the third real-time voltage changes based on the change of the second real-time voltage.

The first end of the first capacitor C51 is electrically connected to the first end of the second sampling resistor R2, and the second end of the first capacitor C51 is electrically connected to the second end of the second sampling resistor R2. The purpose of the first capacitor C51 is to ensure a stable third real-time voltage output.

Specifically, referring to fig. 6, fig. 6 is a schematic diagram of a sixth structure of a heating control circuit according to an embodiment of the present invention. As shown in fig. 6, the switching unit 502 includes a first switching tube T1. Specifically, the gate of the first switching tube T1 is electrically connected to the second sampling unit 501, one of the source and the drain of the first switching tube T1 is electrically connected to the voltage dividing unit 503, and the other of the source and the drain of the first switching tube T1 is electrically connected to the first temperature sampling module 10.

The first switching tube T1 may be a metal oxide semiconductor field effect transistor (MOSFET, abbreviated as MOS tube). The MOS tube is used as a voltage control component, when a certain voltage value exists between the grid electrode and the source electrode of the MOS tube, the MOS tube is in a conducting state, otherwise, the MOS tube is in a cutting-off state. Correspondingly, the first switching tube T1 can be selected from an NPN triode and a PNP triode according to actual needs.

Therefore, in the present embodiment, the first switching tube T1 can be switched between the on state and the off state based on the gate of the first switching tube T1 being connected to the third real-time voltage provided by the second sampling unit 501. Since the third real-time voltage is varied, the on or off state of the first switching tube T1 is also varied.

Specifically, referring to fig. 7, fig. 7 is a schematic diagram of a seventh structure of a heating control circuit according to an embodiment of the present invention. As shown in fig. 7, the voltage dividing unit 503 includes at least one voltage dividing resistor.

Taking the voltage dividing unit 503 as an example, the voltage dividing unit includes a third voltage dividing resistor R51, specifically, a first end of the third voltage dividing resistor R51 is electrically connected to the first temperature sampling module 10, and a second end of the third voltage dividing resistor R51 is electrically connected to the switch unit 502. If the switch unit 502 is in a conducting state, the third voltage dividing resistor R51 and the first temperature sampling module form a parallel path, so as to adjust the first real-time voltage of the first temperature sampling module 10; if the switching unit 502 is in the off state, no loop is formed between the first end and the second end of the third voltage dividing resistor R51, and the first real-time voltage of the first temperature sampling module 10 is not adjusted.

It should be understood that in other embodiments, the voltage dividing unit 503 may further include a third voltage dividing resistor R51 and a fourth voltage dividing resistor R52 connected in parallel, so that in general, the resistance of the voltage dividing unit 503 is an equivalent resistance of the third voltage dividing resistor R51 and the fourth voltage dividing resistor R52 connected in parallel. If one of the third voltage dividing resistor R51 and the fourth voltage dividing resistor R52 is damaged or broken, the other one of the third voltage dividing resistor R51 and the fourth voltage dividing resistor R52 may still form a parallel connection relationship with the first temperature sampling module 10, so as to adjust the first real-time voltage, thereby improving the stability of the heating control circuit.

In an embodiment provided in the present application, please refer to fig. 8, fig. 8 is an eighth structural schematic diagram of a heating control circuit provided in an embodiment of the present invention. As shown in fig. 8, the difference between the present embodiment and the foregoing embodiment is that, in the heating control circuit 100 provided in the present embodiment, the heating control module 30 includes the second switching tube T2 and the third switching tube T3.

The grid electrode of the second switching tube T2 is electrically connected with the temperature judging module, one of the source electrode and the drain electrode of the second switching tube T2 is electrically connected with the grounding end, and the other of the source electrode and the drain electrode of the second switching tube T2 is electrically connected with the grid electrode of the third switching tube.

One of the source and the drain of the third switching tube is electrically connected to the first heating driving voltage terminal Ven1, and the other of the source and the drain of the third switching tube is electrically connected to the heating module 40.

Specifically, the gate of the second switching tube T2 is connected to the second real-time voltage and is in a conductive state, the ground voltage of the ground terminal is provided to the gate of the third switching tube T3, and the third switching tube T3 is in a conductive state based on the ground voltage of the ground terminal, so that the third switching tube T3 provides the first driving heating voltage of the first driving heating voltage terminal Ven1 to the heating module 40, so that the heating module 40 converts the first driving heating voltage into heat energy. Specifically, when the gate of the second switching tube T2 is turned on by the second real-time voltage and is in the off state, the third switching tube T3 is also in the off state, and the heating module 40 is not in the operating state.

It should be noted that, in order to prevent the voltage value of the gate of the second switching tube T2 from being excessively large, a voltage dividing resistor may be serially connected between the temperature determining module 20 and the gate of the second switching tube T2 to protect the second switching tube T2. In addition, to ensure the stability of the voltage connected to the gate of the second switching tube T2, a voltage stabilizing resistor and a voltage stabilizing capacitor may be disposed between the gate of the second switching tube T2 and one of the source and the drain of the second switching tube.

Similarly, a voltage dividing resistor may be serially connected between the gate of the third switching tube T3 and the other one of the source and the drain of the second switching tube T2, and a voltage stabilizing resistor and a voltage stabilizing capacitor may be also arranged between the gate of the third switching tube T3 and the first driving and heating voltage end Ven 1.

Referring to fig. 9, fig. 9 is a schematic circuit diagram of a heating control circuit according to an embodiment of the invention. As shown in fig. 9, the heating control circuit 100 includes a first temperature sampling module 10, a temperature judging module 20, a heating control module 30, a heating module 40, and an oscillation suppression module 50.

Specifically, the first temperature sensing module 10 includes a first temperature sensing unit 101 and a first sampling unit 102. Specifically, the first temperature-sensitive unit 101 includes a first temperature-sensitive resistor R01 and a temperature-sampling voltage-stabilizing capacitor C01. For convenience of the following schematic description, the first temperature-sensitive resistor R01 is a negative temperature coefficient thermistor, that is, the higher the temperature is, the lower the self resistance value of the first temperature-sensitive resistor R01 is. Specifically, the first sampling unit 102 includes a third sampling resistor R02.

The first end of the first temperature-sensitive resistor R01 is electrically connected with the first power supply end V1, and the second end of the first temperature-sensitive resistor R01 is electrically connected with the first node a. The first end of the temperature-collecting voltage-stabilizing capacitor C01 is electrically connected with the first end of the first temperature-sensitive resistor R01, and the second end of the temperature-collecting voltage-stabilizing capacitor C01 is electrically connected with the first node A. The first end of the third sampling resistor R02 is electrically connected with the first node A, the second end of the third sampling resistor R02 is electrically connected with the fourth node D, and the fourth node D is electrically connected with the grounding end. Therefore, the first temperature-sensitive resistor R01 and the third sampling resistor R02 are serially connected between the first power supply terminal V1 and the ground terminal.

The first temperature-sensitive resistor R01 may be disposed on a surface of the battery or the circuit board to be tested, so as to sense a real-time temperature of the battery or the circuit board, and based on a transformation of the real-time temperature, a resistance value of the first temperature-sensitive resistor R01 is changed. When the resistance of the third sampling resistor R02 is a fixed value and the voltage provided by the first power supply terminal V1 is a constant voltage, the voltage at the first node a will change along with the change of the resistance of the first temperature-sensitive resistor R01, and it should be understood that the voltage at the first node a is the first real-time voltage output by the first temperature sampling module 10. Specifically, the voltage provided by the first power supply terminal V1 is 5V.

Specifically, the temperature determining module 20 includes a comparator U1, a first voltage dividing resistor R21, a second voltage dividing resistor R22, a first voltage stabilizing capacitor C21, and a second voltage stabilizing capacitor C22.

The first end of the first voltage dividing resistor R21 is electrically connected to the reference voltage terminal Vref, and the second end of the first voltage dividing resistor R21 is electrically connected to the non-inverting input terminal of the comparator U1. The first end of the first voltage stabilizing capacitor C21 is electrically connected to the reference voltage terminal Vref, and the second end of the first voltage stabilizing capacitor C21 is electrically connected to the ground terminal. The first end of the second voltage dividing resistor R22 is electrically connected to the first node a, and the second end of the second voltage dividing resistor R22 is electrically connected to the negative phase input end of the comparator U1. The output end of the comparator U1 is electrically connected with the second node B, and the comparator U1 is also electrically connected with the power supply end Vop and the grounding end of the comparator respectively. Specifically, the reference voltage provided by the reference voltage terminal Vref is 2.5V, and the voltage provided by the comparator power supply terminal Vop is 5V.

It should be appreciated that the voltage at the second node B is the second real-time voltage. The comparator U1 is used for comparing the voltage of the negative phase input end with the voltage of the positive phase input end. When the voltage of the positive phase input end is larger than that of the negative phase input end, the comparator U1 provides a high-level voltage to the second node B; the comparator U1 provides a low voltage to the second node B when the voltage at the positive phase input is less than the voltage at the negative phase input.

The oscillation suppression module 50 includes a second sampling unit 501, a switching unit 502, and a voltage dividing unit 503. Specifically, the second sampling unit 501 includes a first sampling resistor R1, a second sampling resistor R2, and a first capacitor C51. The switching unit 502 includes a first switching tube T1. The voltage dividing unit 503 includes a third voltage dividing resistor R51 and a fourth voltage dividing resistor R52.

Specifically, a first end of the first sampling resistor R1 is electrically connected to the second node B, and a second end of the first sampling resistor R1 is electrically connected to the third node C. The first end of the second sampling resistor R2 is electrically connected with the third node, and the second end of the second sampling resistor R2 is electrically connected with the fourth node D. The first end of the first capacitor C51 is electrically connected to the third node C, and the second end of the first capacitor C51 is electrically connected to the fourth node D. It should be appreciated that the voltage of the third node C is a third real-time voltage.

Specifically, the gate of the first switching tube T1 is electrically connected to the third node C, one of the source and the drain of the first switching tube T1 is electrically connected to the ground, and the other of the source and the drain of the first switching tube T1 is electrically connected to the first end of the third voltage dividing resistor R51 and the first end of the fourth voltage dividing resistor R52, respectively. It should be understood that when the voltage at the third node C is a high level voltage, the first switching tube T1 is in a conductive state; when the voltage at the third node C is a low level voltage, the first switching tube T1 is in an off state.

That is, when the voltage of the non-inverting input terminal of the comparator U1 is greater than the voltage of the non-inverting input terminal thereof, and thus the comparator U1 outputs the high-level voltage to the second node B, the first switching tube T1 is turned on, thereby controlling the voltage dividing unit 503 to adjust the voltage at the first node a.

It should be noted that the purpose of this arrangement is to avoid that the heating control module is repeatedly in the heating-on state and the heating-off state when the voltages of the positive phase input terminal and the negative phase input terminal of the comparator U1 are equal, so as to inhibit the oscillation of the heating control circuit 100.

Specifically, the second end of the third voltage dividing resistor R51 is electrically connected to the first node a. The second terminal of the fourth voltage dividing resistor R52 is electrically connected to the first node a.

That is, when the first switching transistor T1 is in the on state, the third voltage dividing resistor R51, the fourth voltage dividing resistor R52, and the third sampling resistor R02 are connected in parallel, so that the resistance of the equivalent resistor formed by the third voltage dividing resistor R51, the fourth voltage dividing resistor R52, and the third sampling resistor R02 is smaller than the resistance of the third sampling resistor R02, and thus the voltage division between the first temperature sensitive resistor R01 and the third sampling resistor R02 is changed, so that the voltage at the first node a becomes smaller, that is, the first real-time voltage becomes smaller. Based on this, the voltage difference between the positive-phase input terminal and the negative-phase input terminal of the comparator U1 increases, and the oscillation occurring in the heating control circuit 100 is suppressed.

The heating control module 30 includes a fifth third voltage dividing resistor R51, a sixth voltage dividing resistor R33, a first voltage stabilizing resistor R32, a second voltage stabilizing resistor R34, a third voltage stabilizing capacitor C31, a fourth voltage stabilizing capacitor C32, a second switching tube T2, and a third switching tube T3.

Specifically, the first end of the fifth third voltage dividing resistor R51 is electrically connected to the second node B, and the second end of the fifth third voltage dividing resistor R51 is electrically connected to the gate of the second switching tube T2. One of the source and the drain of the second switching tube T2 is electrically connected to the ground terminal, and the other of the source and the drain of the second switching tube T2 is electrically connected to the first terminal of the sixth voltage dividing resistor R33.

The first end of the first voltage stabilizing resistor R32 is electrically connected to the gate of the second switching tube T2, and the second end of the first voltage stabilizing resistor R32 is electrically connected to one of the source and the drain of the second switching tube T2. The first end of the third voltage stabilizing capacitor C31 is electrically connected to the gate of the second switching tube T2, and the second end of the third voltage stabilizing capacitor C31 is electrically connected to one of the source and the drain of the second switching tube T2.

The second end of the sixth voltage dividing resistor R33 is electrically connected to the gate of the third switching tube T3. One of the source and the drain of the third switching tube T3 is electrically connected to the first heating driving voltage terminal Ven1, and the other of the source and the drain of the third switching tube T3 is electrically connected to the heating module 40. Specifically, the first heating driving voltage provided by the first heating driving voltage terminal Ven1 is 28V.

The first end of the second voltage stabilizing resistor R34 is electrically connected to the first heating driving voltage end Ven1, and the second end of the second voltage stabilizing resistor R34 is electrically connected to the gate of the third switching tube T3. The first end of the fourth voltage stabilizing capacitor C32 is electrically connected to the first heating driving voltage end Ven1, and the second end of the fourth voltage stabilizing capacitor C32 is electrically connected to the gate of the third switching tube T3.

The heating control module 30 may further include a zener diode D1. The positive electrode of the zener diode D1 is electrically connected to the gate of the third switching tube T3, and the negative electrode of the zener diode D1 is electrically connected to the first heating driving voltage terminal Ven 1.

The heating module 40 includes a circuit heating plate, wherein a positive electrode of the circuit heating plate is electrically connected with the other of the source electrode and the drain electrode of the third switching tube T3, and a negative electrode of the circuit heating plate is electrically connected with a ground terminal.

In an embodiment provided in the present application, please refer to fig. 10, fig. 10 is a schematic diagram of a ninth structure of a heating control circuit according to an embodiment of the present invention. As shown in fig. 10, this embodiment is different from the foregoing embodiments in that the heating control circuit 100 provided in this embodiment further includes a microprocessor module 60.

Wherein the microprocessor module 60 is electrically connected to the temperature judging module 20 and the heating module 40, respectively. The micro-processing module 60 may be configured to provide a second heating driving voltage to the heating module 40 based on the second real-time voltage provided by the temperature determining module 20, so that the heating module 40 heats based on the second heating driving voltage.

Specifically, the micro-processing module 60 includes at least one micro-processing chip (MCU), and the micro-processing chip carries a matching algorithm to control the working state of the heating module 40 based on the obtained second real-time voltage. Thus, the heating control circuit 100 provided in this embodiment has both a hardware logic judgment circuit and a software logic judgment circuit.

It should be noted that the micro-processing module 60 may also convert the received second real-time voltage into the first real-time temperature according to the matching algorithm, and store the second real-time voltage and the corresponding first real-time temperature.

It should be emphasized that the micro-processing chip itself has a certain requirement on the ambient temperature, that is, when the ambient temperature of the micro-processing chip is lower than the working temperature of the micro-processing chip, the micro-processing chip cannot control the heating module 40 to heat. Therefore, when the micro-processing chip cannot work, the heating control circuit 100 provided in this embodiment can still control the heating module 40 to heat, so that the hardware logic judgment circuit and the software logic judgment circuit are combined together to perform a complementary function; the micro-processing chip meeting the low-temperature work can be developed or used instead, and the production cost of the heating control circuit is reduced.

In an embodiment provided in the present application, please refer to fig. 11, fig. 11 is a schematic diagram of a tenth structure of a heating control circuit provided in an embodiment of the present invention. As shown in fig. 11, the difference between the present embodiment and the foregoing embodiment is that the heating control circuit 100 provided in the present embodiment further includes a second temperature sampling module 70.

The second temperature acquisition module 70 is electrically connected with the micro-processing module 60. The second temperature acquisition module 70 may detect the temperature of the specific object and output a fourth real-time voltage to the micro-processing module 60 based on the detected temperature. I.e. the fourth real time voltage is varied based on the real time temperature. The specific object may be a battery or a circuit board of a battery management system.

Specifically, the second temperature sampling module 70 may include one of temperature-sensitive resistors, a resistor temperature detector, an integrated circuit temperature sensor, and the like. The specific temperature pickup element of the second temperature pickup module 70 may be selected according to actual requirements.

Therefore, the micro-processing module 60 can also convert the received fourth real-time voltage into the second real-time temperature according to the matching algorithm, and store the fourth real-time voltage and the corresponding second real-time temperature.

In the heating control circuit 100 provided in this embodiment, one of the first temperature collecting module 10 and the second temperature collecting module 70 may be disposed on the battery to detect the temperature environment of the battery, so as to ensure that the battery can work normally in a low temperature environment, and meanwhile, the other of the first temperature collecting module 10 and the second temperature collecting module 70 may be disposed on the circuit board to detect the temperature environment of the circuit board, so as to ensure that the circuit board can work normally in a low temperature environment. The heating of the battery and the heating of the circuit board can be controlled in a low-temperature environment.

In an embodiment provided in the present application, please refer to fig. 12, fig. 12 is an eleventh structural diagram of a heating control circuit provided in an embodiment of the present invention. As shown in fig. 12, the difference between the present embodiment and the foregoing embodiment is that the heating control circuit 100 provided in the present embodiment further includes a communication module 80.

The communication module 80 is electrically connected to the micro-processing module 60, and the communication module 80 is configured to perform information interaction with the outside based on the second real-time voltage and the fourth voltage acquired by the micro-processing module 60. It should be understood that the communication module 80 is used as an interaction medium for connecting the micro-processing module 60 with the outside, and specifically, the communication module 80 can interact information between the second real-time voltage, the fourth real-time voltage, the first real-time temperature of the first temperature acquisition module 10, and the second real-time temperature of the second temperature acquisition module 70 acquired by the micro-processing module 60 and the outside. Specifically, the communication module 80 may include a SIT3490 chip.

In an embodiment provided in the present application, please refer to fig. 13, fig. 13 is a schematic diagram illustrating a twelfth structure of a heating control circuit according to an embodiment of the present invention. As shown in fig. 13, this embodiment is different from the foregoing embodiment in that, in the heating control circuit 100 provided in this embodiment, a power supply module 90 is further included.

The power supply module 90 is electrically connected to the first temperature sampling module 10, the temperature judging module 20, the reference voltage terminal Vref, the first heating driving voltage terminal Ven1, the microprocessor module 60, the second temperature sampling module 70, and the communication module 80, respectively. The power supply module 90 is configured to provide corresponding voltages to the first temperature sampling module 10, the temperature judging module 20, the reference voltage terminal Vref, the first heating driving voltage terminal Ven1, the microprocessor module 60, the second temperature sampling module 70, and the communication module 80, respectively. The microprocessor module 60 may also obtain the voltage parameter of the power supply module 90, and perform information interaction to the outside through the communication module 80.

The embodiment of the application also provides a battery pack, which includes the heating control circuit 100 and the battery body according to any of the foregoing embodiments. In this embodiment, the battery body is heated and controlled by the heating control circuit 100, so that the battery body is ensured to work normally in a low-temperature environment.

The foregoing has outlined rather broadly the more detailed description of embodiments of the invention, wherein the principles and embodiments of the invention are explained in detail using specific examples, the above examples being provided solely to facilitate the understanding of the method and core concepts of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present invention, the present description should not be construed as limiting the present invention.

Claims (13)

1. A heating control circuit, comprising:

the first temperature acquisition module is used for outputting a first real-time voltage, and the first real-time voltage changes based on the change of the real-time temperature;

the temperature judging module is electrically connected with the first temperature collecting module and the reference voltage end respectively and is used for outputting a second real-time voltage based on the first real-time voltage and the reference voltage output by the reference voltage end;

the oscillation suppression module is electrically connected with the first temperature acquisition module and the temperature judgment module respectively, and is used for adjusting the first real-time voltage based on the second real-time voltage;

the heating control module is electrically connected with the temperature judging module and the first heating driving voltage end respectively, and is used for outputting the first heating driving voltage provided by the first heating driving voltage end based on the second real-time voltage;

the heating module is electrically connected with the heating control module and is used for heating based on the first heating driving voltage.

2. The heating control circuit of claim 1, wherein the first temperature acquisition module comprises a first temperature sensitive unit and a first sampling unit;

the first end of the first temperature-sensitive unit is electrically connected with a first power supply end, and the second end of the first temperature-sensitive unit is electrically connected with the temperature judging module, the first end of the first sampling unit and the oscillation suppression module respectively; the first temperature-sensitive unit is used for detecting the change of the real-time temperature;

the second end of the first sampling unit is electrically connected with the grounding end, and the first sampling unit is used for outputting a first real-time voltage based on the real-time temperature change.

3. The heating control circuit of claim 1, wherein the temperature determination module comprises a comparator;

the first input end of the comparator is electrically connected with the reference voltage end, the second input end of the comparator is electrically connected with the first temperature acquisition module, and the output end of the comparator is electrically connected with the heating control module.

4. The heating control circuit according to claim 1, wherein the oscillation suppression module includes a second sampling unit, a switching unit, and a voltage dividing unit;

The second sampling unit is electrically connected with the temperature judging module, the switch unit and the grounding end respectively, and is used for collecting the second real-time voltage and outputting a third real-time voltage to the switch unit according to the second real-time voltage;

the switch unit is respectively and electrically connected with the voltage dividing unit and the first temperature acquisition module, and is used for controlling the on-off state of the voltage dividing unit based on the third real-time voltage;

the voltage dividing unit is electrically connected with the first temperature sampling module and is used for adjusting the first real-time voltage.

5. The heating control circuit of claim 4, wherein the second sampling unit comprises a first sampling resistor, a second sampling resistor, and a first capacitor;

the first end of the first sampling resistor is electrically connected with the temperature judging module, and the second end of the first sampling resistor is electrically connected with the first end of the second sampling resistor and the switch unit respectively;

the second end of the second sampling resistor is electrically connected with the grounding end;

the first end of the first capacitor is electrically connected with the first end of the second sampling resistor, and the second end of the first capacitor is electrically connected with the second end of the second sampling resistor.

6. The heating control circuit of claim 4, wherein the switching unit comprises a first switching tube;

the grid electrode of the first switching tube is electrically connected with the second sampling unit, one of the source electrode and the drain electrode of the first switching tube is electrically connected with the voltage dividing unit, and the other of the source electrode and the drain electrode of the first switching tube is electrically connected with the first temperature sampling module.

7. The heating control circuit of claim 4, wherein the voltage dividing unit comprises at least one voltage dividing resistor;

the first end of the voltage dividing resistor is electrically connected with the first temperature sampling module, and the second end of the voltage dividing resistor is electrically connected with the switch unit.

8. The heating control circuit of claim 1, wherein the heating control module comprises a second switching tube and a third switching tube;

the grid electrode of the second switching tube is electrically connected with the temperature judging module, one of the source electrode and the drain electrode of the second switching tube is electrically connected with the grounding end, and the other of the source electrode and the drain electrode of the second switching tube is electrically connected with the grid electrode of the third switching tube;

one of a source electrode and a drain electrode of the third switching tube is electrically connected with the first heating driving voltage end, and the other of the source electrode and the drain electrode of the third switching tube is electrically connected with the heating module.

9. The heating control circuit of any of claims 1-8, wherein the heating control circuit further comprises a microprocessor module;

the micro-processing module is respectively and electrically connected with the heating control module and the heating module, and is used for providing a second heating driving voltage for the heating module based on the second real-time voltage;

the heating module heats based on the second heating driving voltage.

10. The heating control circuit of claim 9, wherein the heating control circuit further comprises a second temperature acquisition module;

the second temperature acquisition module is electrically connected with the micro-processing module and is used for outputting a fourth real-time voltage, and the fourth real-time voltage changes based on the change of the real-time temperature;

the micro-processing module provides the second heating driving voltage to the heating module based on the fourth real-time voltage.

11. The heating control circuit of claim 10, wherein the heating control circuit further comprises a communication module;

the communication module is electrically connected with the micro-processing module, and is used for carrying out information interaction with the outside based on the second real-time voltage and the fourth real-time voltage.

12. The heating control circuit of any one of claims 1-8, further comprising a power supply module;

the power supply module is electrically connected with the first temperature collecting module, the temperature judging module, the reference voltage end and the first heating driving voltage end respectively, and the power supply module is used for providing corresponding voltages for the first temperature collecting module, the temperature judging module, the reference voltage end and the first heating driving voltage end respectively.

13. A battery pack comprising a battery body and a heating control circuit according to any one of claims 1 to 12.

Images