WO-2026091452-A1 - HEATING CONTROL CIRCUIT, HEATING CONTROL SYSTEM, AND VEHICLE

WO2026091452A1WO 2026091452 A1WO2026091452 A1WO 2026091452A1WO-2026091452-A1

Abstract

A heating control circuit, a heating control system, and a vehicle. The heating control circuit comprises an input sub-circuit and a driving sub-circuit. The input sub-circuit is configured to receive a first control signal, to be turned on in response to the first control signal, to output a second control signal, and to be turned off in response to not receiving the first control signal. A first end of the driving sub-circuit is connected to a heating member, the heating member is connected to a power supply end, a second end of the driving sub-circuit is connected to a first ground end, and a third end of the driving sub-circuit is connected to the input sub-circuit to receive the second control signal. The driving sub-circuit is configured to be turned on in response to a second control signal, so that a path is formed between the power supply end and the first ground end, or to be turned off when the input sub-circuit is turned off.

Inventors

PU, Jiang
TANG, Guofeng
LIU, QINGSHAN
CHEN, YONG
YU, Cheng

Assignees

深蓝汽车科技有限公司

Dates

Publication Date: 20260507
Application Date: 20250508
Priority Date: 20241030

Claims (14)

A heating control circuit, comprising: The input sub-circuit (Q1) is configured to receive a first control signal, turn on in response to the first control signal and output a second control signal, and turn off in response to not receiving the first control signal. A drive sub-circuit (Q2) has a first terminal connected to a heating element (M), a heating element (M) connected to a power supply terminal (Y), a second terminal connected to a first ground terminal (D1), and a third terminal connected to an input sub-circuit (Q1) to receive the second control signal. The drive sub-circuit (Q2) is configured to turn on in response to the second control signal to form a path between the power supply terminal (Y) and the first ground terminal (D1); or to turn off when the input sub-circuit (Q1) is turned off.
According to claim 1, the heating control circuit, wherein the driving sub-circuit (Q2) comprises: a first transistor (T1) and a first resistor (R1); The control terminal of the first transistor (T1) is connected to the third terminal of the driving sub-circuit (Q2), the first terminal of the first transistor (T1) is connected to the first terminal of the driving sub-circuit (Q2), and the second terminal of the first transistor (T1) is connected to the second terminal of the driving sub-circuit (Q2). The first end of the first resistor (R1) is connected to the control terminal of the first transistor (T1), and the second end of the first resistor (R1) is connected to the second end of the first transistor (T1).
The heating control circuit according to claim 1 or 2, wherein the input sub-circuit (Q1) includes: an isolation optocoupler (W); The positive input terminal of the isolation optocoupler (W) is configured to receive the first control signal, the negative input terminal of the isolation optocoupler (W) is connected to the second ground terminal (D2), the positive output terminal of the isolation optocoupler (W) is configured to receive a regulated signal, and the negative output terminal of the isolation optocoupler (W) is connected to the third terminal of the driver sub-circuit (Q2).
The heating control circuit according to claim 3 further includes: a voltage regulator sub-circuit (Q3); The voltage regulator sub-circuit (Q3) is connected to the power supply terminal (Y) and to the positive input terminal of the isolation optocoupler (W); The voltage regulator sub-circuit (Q3) is configured to receive the power signal output from the power supply terminal (Y) and provide the regulated signal to the isolation optocoupler (W) based on the power signal.
According to claim 4, the heating control circuit, wherein the voltage regulator sub-circuit (Q3) comprises: a transistor (T2), a Zener diode (W1), and a capacitor (C); The positive terminal of the Zener diode (W1) is connected to the control terminal of the transistor (T2), and the negative terminal of the Zener diode (W1) is connected to the first ground terminal (D1). The first end of the transistor (T2) is connected to the power supply terminal (Y), and the second end of the transistor (T2) is connected to the first terminal of the capacitor (C) and the positive terminal of the output terminal of the isolation optocoupler (W). The second terminal of the capacitor (C) is connected to the first ground terminal (D1).
According to the heating control circuit of claim 5, the voltage regulator sub-circuit (Q3) further includes: a second resistor (R2) and a third resistor (R3); The first terminals of both the second resistor (R2) and the third resistor (R3) are connected to the power supply terminal (Y); The second terminal of the second resistor (R2) is connected to the first terminal of the transistor (T2); The second terminal of the third resistor (R3) is connected to the control terminal of the transistor (T2) and the positive terminal of the Zener diode (W1).
The heating control circuit according to any one of claims 3 to 6, wherein the input sub-circuit (Q1) further includes: a fourth resistor (R4) and a fifth resistor (R5); The fourth resistor (R4) is connected to the positive terminal of the input of the isolation optocoupler (W); The fifth resistor (R5) is connected between the negative terminal of the output terminal of the isolation optocoupler (W) and the third terminal of the driver sub-circuit (Q2).
A heating control system, comprising: Heating control circuit according to any one of claims 1 to 7; A heating element (M) is connected to the drive sub-circuit (Q2) in the heating control circuit; the heating element (M) is configured as a heating battery (10), and the battery (10) is connected to the heating element (M) as the power supply terminal (Y); and A controller (K) is connected to the input sub-circuit (Q1); the controller (K) is configured to provide a first control signal to the input sub-circuit (Q1) in the heating control circuit, the first control signal being configured to control the input sub-circuit (Q1) to turn on.
The heating control system according to claim 8 further includes: a temperature sensor (101) configured to detect the temperature of the battery (10) and send the detected temperature value to the controller (K); The controller (K) is also configured to: If it is determined that the temperature of the battery (10) is less than or equal to the first temperature threshold, then the first control signal is provided to the input sub-circuit (Q1); If it is determined that the temperature of the battery (10) is greater than or equal to the first temperature threshold, then the first control signal is stopped from being supplied to the input sub-circuit (Q1).
According to the heating control system of claim 9, the controller (K) is further configured to continuously provide the first control signal to the input sub-circuit (Q1) when a first preset condition is met; The first control signal is stopped being supplied to the input sub-circuit (Q1) until the temperature of the battery (10) is greater than or equal to the first temperature threshold. The first preset condition includes: The battery (10) is connected to a charging port, the difference between the maximum power of the charging port and the maximum power of the battery (10) is greater than or equal to the maximum power of the heating element (M), and the temperature of the battery (10) is less than or equal to a first temperature threshold; or, The battery (10) discharges to the load, the difference between the maximum power of the battery (10) and the maximum power of the load is greater than or equal to the maximum power of the heating element (M), and the temperature of the battery (10) is less than or equal to a first temperature threshold; or, The battery (10) is in a state of not charging and not discharging to the load, the maximum power of the battery (10) is greater than or equal to the maximum power of the heating element (M), and the temperature of the battery (10) is less than or equal to a first temperature threshold.
According to claim 9, the heating control system wherein the controller (K) is further configured to intermittently provide the first control signal to the input sub-circuit (Q1) when a second preset condition is met; The first control signal is stopped being supplied to the input sub-circuit (Q1) until the temperature of the battery (10) is greater than or equal to the first temperature threshold. The second preset condition includes: The battery (10) is connected to a charging port, the difference between the maximum power of the charging port and the maximum power of the battery (10) is less than the maximum power of the heating element (M), and the temperature of the battery (10) is less than or equal to a first temperature threshold; or, The battery (10) discharges to the load, the difference between the maximum power of the battery (10) and the maximum power of the load is less than the maximum power of the heating element (M), and the temperature of the battery (10) is less than or equal to a first temperature threshold.
According to the heating control system of claim 11, in the process of intermittently providing the first control signal to the input sub-circuit (Q1), each provision of the first control signal lasts for a first preset duration, and the interval between two adjacent provisiones of the first control signal is a second preset duration.
According to the heating control system of claim 12, the first preset duration is t1, the second preset duration is t2, and t1/(t1+t2)＝P×U 2 /R; where P is the average available power of the heating element, U is the voltage across the heating element, and R is the resistance of the heating element. The average available power of the heating element (M) is the difference between the maximum power of the charging port and the maximum power of the battery (10), or the difference between the maximum power of the battery (10) and the maximum power of the load.
A vehicle comprising: The heating control system according to any one of claims 8 to 13; and A battery (10) is connected to the heating element (M) in the heating control system as the power supply terminal (Y), and the heating element (M) is in contact with the battery (10).

Description

Heating control circuit, heating control system and vehicle This application claims priority to Chinese patent application No. 202411533141.X, filed on October 30, 2024, the entire contents of which are incorporated herein by reference. Technical Field This disclosure relates to the field of power battery technology, and in particular to a heating control circuit, a heating control system, and a vehicle. Background Technology In low-temperature environments, the discharge capacity and charging efficiency of power batteries decrease significantly, thus affecting the vehicle's driving range and driving experience. To address the impact of low temperatures on power batteries, heating films can be used to heat the battery cells, thereby increasing the battery's operating temperature. Summary of the Invention The purpose of this disclosure is to address the following issues when heating a battery with a heating element: if the power of the heating element is constant, excessive power may cause safety problems; if the power is too low, the temperature rise rate will be too low under low temperature conditions, resulting in poor battery charging and discharging performance. In a first aspect, a heating control circuit is provided, comprising: an input sub-circuit and a drive sub-circuit. The input sub-circuit is configured to receive a first control signal, turn on in response to the first control signal and output a second control signal, and turn off in response to not receiving the first control signal; a first terminal of the drive sub-circuit is connected to a heating element, the heating element is connected to a power supply terminal, a second terminal of the drive sub-circuit is connected to a first ground terminal, and a third terminal of the drive sub-circuit is connected to the input sub-circuit to receive the second control signal; the drive sub-circuit is configured to, in response to the second control signal, turn on to form a path between the power supply terminal and the first ground terminal; or, turn off when the input sub-circuit is turned off. According to the above technical means, after the input sub-circuit in the heating control circuit receives the first control signal and turns on, and outputs the second control signal, the drive sub-circuit turns on. Therefore, the heating control circuit can control the drive sub-circuit to turn on through the first control signal, thereby heating the heating element. In this way, the actual average output power of the heating element can be dynamically adjusted by adjusting the input time of the first control signal, and the actual average output power of the heating element can achieve variable power control from 0 to the maximum power output of the heating element. This not only avoids safety problems caused by excessive temperature of the heating element, but also increases the power of the heating element to improve the heating rate under low temperature conditions. Therefore, the heating control circuit can flexibly adjust the power of the heating element. In one possible implementation, the driving sub-circuit includes: a first transistor and a first resistor, wherein the control terminal of the first transistor is connected to a third terminal of the driving sub-circuit, a first terminal of the first transistor is connected to a first terminal of the driving sub-circuit, and a second terminal of the first transistor is connected to a second terminal of the driving sub-circuit. The first terminal of the first resistor is connected to the control terminal of the first transistor, and the second terminal of the first resistor is connected to the second terminal of the first transistor. Based on the above-described technical means, the driving sub-circuit in the heating control circuit provided in some embodiments of this disclosure can be turned on in response to a second control signal by setting a first transistor and a first resistor, forming a path between the power supply terminal and the first ground terminal to heat the heating element. Therefore, the heating control circuit has a simple structure and saves costs. In one possible implementation, the input sub-circuit includes: an isolation optocoupler, the positive terminal of which is configured to receive a first control signal, the negative terminal of which is connected to a second ground terminal, the positive terminal of which is configured to receive a regulated signal, and the negative terminal of which is connected to a third terminal of the drive sub-circuit. Based on the above-mentioned technical means, the heating control circuit provided in some embodiments of this disclosure adopts an isolation optocoupler, which can realize electrical isolation between circuits, effectively prevent interference and damage between circuits, and thus improve the stability and reliability of the heating control circuit. In one possible implementation, the heating control circuit further includes