Heating control circuit, heating control system and vehicle

Abstract

The invention relates to a heating control circuit, a heating control system and a vehicle, and the heating control circuit comprises an input sub-circuit and a driving sub-circuit. The input sub-circuit is used for receiving a first control signal, is switched on in response to the first control signal and outputting a second control signal, and is switched off in response to the situation that the first control signal is not received; the first end of the driving sub-circuit is connected with the heating element, the heating element is connected with the power supply end, the second end of the driving sub-circuit is connected with the first grounding end, and the third end of the driving sub-circuit is connected with the input sub-circuit to receive a second control signal; the driving sub-circuit is used for responding to a second control signal to be switched on, so that a path is formed between the power supply end and the first grounding end; or the input sub-circuit is switched off under the condition that the input sub-circuit is switched off. The heating control circuit can flexibly adjust the power of the heating element.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a heating control circuit, a heating control system and a vehicle. Background Art

[0002] In low temperature environments, the discharge capacity and charging efficiency of power batteries will be significantly reduced, which will affect the vehicle's mileage and driving experience. In order to solve the impact of low temperature on power batteries, power batteries can currently be heated through heating films, thereby heating the battery cells to increase the operating temperature of the power batteries.

[0003] The application number is CN207852865U, and the name of the invention is low-temperature battery pack. It discloses a technical solution: by adding a heating film to the battery pack, and using the battery BMS to detect the temperature sensor built into each battery to control the heating temperature, when the temperature is low, low-temperature heating is performed using the series-connected heating film, and charging is performed only after the temperature rises to a certain value.

[0004] The application number is CN113270912A, and the invention name is a battery charging isolation heating control technology method, which discloses a technical solution: when charging the battery in a low-temperature environment, the isolation circuit is turned on, and the heating film is powered by the charger, while the charging MOS is turned off and the battery is not charged; when the battery temperature is heated to a charging temperature, the heating is turned off and the charging MOS is turned on to charge the battery. In other words, charging and heating are isolated from each other. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that when a heating element is used to heat a battery, the power of the heating element is constant, so that if the power of the heating element is too large, it is easy to cause safety problems, and if the power is too small, the temperature rise rate is low under low temperature conditions, causing poor battery charging and discharging performance.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] According to the first aspect of the present application, a heating control circuit is provided, comprising: an input subcircuit and a driving subcircuit. The input subcircuit is used to receive a first control signal, conduct and output a second control signal in response to the first control signal, and shut down in response to not receiving the first control signal; the first end of the driving subcircuit is connected to the heating element, the heating element is connected to the power supply end, the second end of the driving subcircuit is connected to the first ground end, and the third end of the driving subcircuit is connected to the input subcircuit to receive the second control signal; the driving subcircuit is used to conduct in response to the second control signal so that a path is formed between the power supply end and the first ground end; or shut down when the input subcircuit is shut down.

[0008] According to the above technical means, after the input subcircuit in the heating control circuit receives the first control signal and turns on, and outputs the second control signal, the driving subcircuit turns on, so the heating control circuit can control the driving subcircuit to turn on through the first control signal, and then heat the heating element. In this way, the actual output average power of the heating element can be dynamically adjusted by adjusting the input time of the first control signal, and the actual output average power of the heating element can achieve variable power control from 0 to the maximum power output of the heating element. Not only can it avoid safety problems caused by excessive temperature of the heating element, but under low temperature conditions, the power of the heating element can also be increased to increase the heating rate of the heating element. Therefore, the heating control circuit can flexibly adjust the power size of the heating element.

[0009] In a possible implementation, the driving subcircuit includes: a first transistor and a first resistor; the control end of the first transistor is connected to the third end of the driving subcircuit, the first end of the first transistor is connected to the first end of the driving subcircuit, and the second end of the first transistor is connected to the second end of the driving subcircuit; the first end of the first resistor is connected to the control end of the first transistor, and the second end of the first resistor is connected to the second end of the first transistor.

[0010] According to the above technical means, the driving subcircuit in the heating control circuit provided by the present application can be turned on in response to the second control signal by setting the first transistor and the first resistor, so as to form 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.

[0011] In one possible implementation, the input subcircuit includes: an isolation optocoupler; the positive input terminal of the isolation optocoupler is used to receive a first control signal, the negative input terminal of the isolation optocoupler is connected to the second ground terminal, the positive output terminal of the isolation optocoupler is used to receive a voltage stabilization signal, and the negative output terminal of the isolation optocoupler is connected to the third terminal of the driving subcircuit.

[0012] According to the above-mentioned technical means, the heating control circuit provided in the present application adopts an isolation optocoupler, which can realize electrical isolation between circuits, effectively prevent interference and damage between circuits, and improve the stability and reliability of the heating control circuit.

[0013] In a possible implementation, the heating control circuit further includes: a voltage stabilizing subcircuit; the voltage stabilizing subcircuit is connected to the power supply end and to the positive pole of the input end of the isolation optocoupler; the voltage stabilizing subcircuit is used to receive the power signal output by the power supply end and provide a voltage stabilizing signal to the isolation optocoupler based on the power signal.

[0014] According to the above-mentioned technical means, the heating control circuit provided in the present application forms a high-voltage to low-voltage voltage stabilizing circuit, which can provide a stable voltage for the first transistor, and has a simple structure, avoiding the use of a dedicated isolated power supply module, thereby saving costs.

[0015] In a possible implementation, the voltage stabilizing subcircuit includes: a transistor, a voltage regulator and a capacitor; the positive electrode of the voltage regulator is connected to the control end of the transistor, and the negative electrode of the voltage regulator is connected to the first ground end; the first end of the transistor is connected to the power supply end, and the second end of the transistor is connected to the first electrode of the capacitor and the positive electrode of the output end of the isolation optocoupler; the second electrode of the capacitor is connected to the first ground end.

[0016] According to the above technical means, the heating control circuit provided in the present application provides a stable voltage for the first transistor through a voltage regulator tube, and forms a high-voltage to low-voltage voltage regulator circuit with a simple structure, avoiding the use of a dedicated isolated power supply module, and saving costs.

[0017] In a possible implementation, the voltage stabilizing subcircuit also includes: a second resistor and a third resistor; the first ends of the second resistor and the third resistor are both connected to the power supply end; the second end of the second resistor is connected to the first end of the transistor; the second end of the third resistor is connected to the control end of the transistor and the positive electrode of the voltage stabilizing tube.

[0018] According to the above-mentioned technical means, a second resistor and a third resistor are arranged in the heating control circuit provided in the present application, wherein the second resistor can limit the power in the heating control circuit to ensure the normal operating temperature of each part of the circuit components, and the third resistor can play a role of voltage divider to stabilize the voltage between the third resistor and the voltage regulator tube, which is conducive to forming a high-voltage to low-voltage voltage regulator circuit in the heating control circuit.

[0019] In a possible implementation, the input subcircuit further includes: a fourth resistor and a fifth resistor; the fourth resistor is connected to the positive input terminal of the isolation optocoupler; and the fifth resistor is connected between the negative output terminal of the isolation optocoupler and the third terminal of the drive subcircuit.

[0020] According to the above technical means, the heating control circuit provided in the present application can control the magnitude of the current in the circuit through the fourth resistor and the fifth resistor to ensure that the isolation optocoupler can be normally turned on.

[0021] According to the second aspect of the present application, a heating control system is provided, comprising: a heating control circuit in any of the above embodiments, a heating element and a controller. The heating element is connected to a driving subcircuit in the heating control circuit; the heating element is used to heat a battery, and the battery is connected to the heating element as a power supply terminal; the controller is connected to an input subcircuit; the controller is used to provide a first control signal to the input subcircuit in the heating control circuit, and the first control signal is used to control the conduction of the input subcircuit.

[0022] According to the above technical means, the heating control system provided by the present application, the heating element is used to heat the battery, so when the battery is under low temperature conditions, the input time of the first control signal can be increased to increase the actual output average power of the heating element, increase the heating rate of the heating element, and then increase the heating rate of the battery to improve the charging and discharging performance of the battery. When the battery temperature is too high, the first control signal can be stopped from being input to stop heating the heating element, and then stop heating the battery. Alternatively, the input time of the first control signal can be reduced to reduce the actual output average power of the heating element, reduce the heating rate of the heating element, and then reduce the heating rate of the battery to avoid safety problems caused by excessive battery temperature. Therefore, the heating control system provided in this embodiment can not only avoid safety problems caused by excessive battery temperature, but also realize dynamic control of the power of the heating element according to different usage scenarios of the battery, and can solve the problem of low temperature heating and low temperature heating rate of the heating element caused by insufficient power of the heating element.

[0023] In a possible embodiment, the heating control system also includes: a temperature sensor, used to detect the temperature of the battery and send the detected temperature value to the controller; the controller is used to provide a first control signal to the input subcircuit based on the battery temperature being less than or equal to the first temperature threshold; based on the battery temperature being greater than or equal to the first temperature threshold, stop providing the first control signal to the input subcircuit.

[0024] According to the above-mentioned technical means, the heating control system provided in the present application can obtain the temperature of the battery in real time and accurately by setting a temperature sensor, so as to facilitate timely dynamic control of the actual output average power of the heating element, thereby avoiding safety problems caused by excessively high battery temperature, or poor battery charging and discharging performance caused by excessively low battery temperature.

[0025] In a possible embodiment, the controller is specifically used to continuously provide a first control signal to the input subcircuit when a first preset condition is met; until the temperature of the battery is greater than or equal to a first temperature threshold, and then stop providing the first control signal to the input subcircuit; wherein the first preset condition includes: the battery is connected to the charging port, the difference between the maximum power of the charging port and the maximum power of the battery is greater than or equal to the maximum power of the heating element, and the temperature of the battery is less than or equal to the first temperature threshold; or, the battery is discharging to the load, the difference between the maximum power of the battery and the maximum power of the load is greater than or equal to the maximum power of the heating element, and the temperature of the battery is less than or equal to the first temperature threshold; or, the battery is in a state of neither charging nor discharging to the load, the maximum power of the battery is greater than or equal to the maximum power of the heating element, and the temperature of the battery is less than or equal to the first temperature threshold.

[0026] According to the above technical means, the heating control system provided in the present application can avoid safety problems caused by excessive battery temperature.

[0027] In a possible embodiment, the controller is specifically used to intermittently provide a first control signal to the input subcircuit when a second preset condition is met; until the temperature of the battery is greater than or equal to a first temperature threshold, and then stop providing the first control signal to the input subcircuit; wherein the second preset condition includes: the battery is connected to the charging port, the difference between the maximum power of the charging port and the maximum power of the battery is less than the maximum power of the heating element, and the temperature of the battery is less than or equal to the first temperature threshold; or, the battery discharges to the load, the difference between the maximum power of the battery and the maximum power of the load is less than the maximum power of the heating element, and the temperature of the battery is less than or equal to the first temperature threshold.

[0028] According to the above-mentioned technical means, the heating control system provided in the present application can not only avoid safety problems caused by excessive battery temperature, but also avoid the actual output average power of the heating element being too large when the battery is charged, resulting in the battery being unable to charge when the battery is heated; or the battery reverse discharge causing insufficient vehicle power when the vehicle is driving.

[0029] In a possible implementation, in the process of intermittently providing the first control signal to the input subcircuit, each provision of the first control signal lasts for a first preset duration, and a second preset duration is spaced between two adjacent provision of the first control signal.

[0030] According to the above technical means, the heating control system provided in the present application can dynamically adjust the actual average output power of the heating element.

[0031] In a possible implementation, the first preset time length is t1, the second preset time length is t2, t1 / (t1+t2)=P×U2 / R; wherein 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 is the difference between the maximum power of the charging port and the maximum power of the battery, or the difference between the maximum power of the battery and the maximum power of the load.

[0032] According to the above-mentioned technical means, the heating control system provided in the present application can dynamically adjust the actual output average power of the heating element to avoid the actual output average power of the heating element being too large, resulting in the battery being unable to charge when the battery is heated; or the battery reverse discharge causing the vehicle to lack power when the vehicle is driving.

[0033] Beneficial effects of the present invention:

[0034] (1) The heating control circuit provided in the present application can control the conduction of the driving subcircuit through the first control signal, thereby heating the heating element. In this way, the actual output average power of the heating element can be dynamically adjusted by adjusting the input time of the first control signal, and the actual output average power of the heating element can achieve variable power control from 0 to the maximum power output of the heating element. Not only can it avoid safety problems caused by excessive temperature of the heating element, but under low temperature conditions, the power of the heating element can also be increased to increase the heating rate of the heating element. Therefore, the heating control circuit can flexibly adjust the power size of the heating element.

[0035] (2) The driving subcircuit in the heating control circuit provided by the present application can be turned on in response to the second control signal by setting the first transistor and the first resistor, so as to form 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.

[0036] (3) The heating control circuit provided in the present application adopts an isolation optocoupler, which can achieve electrical isolation between circuits, effectively prevent interference and damage between circuits, and improve the stability and reliability of the heating control circuit.

[0037] (4) The heating control circuit provided in the present application forms a high-voltage to low-voltage voltage stabilizing circuit, which can provide a stable voltage for the first transistor, and has a simple structure, avoiding the use of a dedicated isolated power supply module, thereby saving costs.

[0038] (5) A second resistor and a third resistor are provided in the heating control circuit provided in the present application, wherein the second resistor can limit the power in the heating control circuit to ensure the normal operating temperature of each circuit component, and the third resistor can play a role of voltage divider to stabilize the voltage between the third resistor and the voltage regulator tube, which is conducive to forming a high-voltage to low-voltage voltage regulator circuit in the heating control circuit.

[0039] (6) The heating control circuit provided in the present application can control the magnitude of the current in the circuit through the fourth resistor and the fifth resistor to ensure that the isolation optocoupler can be normally turned on.

[0040] (7) In the heating control system provided by the present application, the heating element is used to heat the battery. Therefore, when the battery is under low temperature conditions, the input time of the first control signal can be increased to increase the actual output average power of the heating element, increase the heating rate of the heating element, and then increase the heating rate of the battery to improve the charging and discharging performance of the battery. When the battery temperature is too high, the first control signal can be stopped from being input to stop heating the heating element, and then stop heating the battery. Alternatively, the input time of the first control signal can be reduced to reduce the actual output average power of the heating element, reduce the heating rate of the heating element, and then reduce the heating rate of the battery to avoid safety problems caused by excessive battery temperature. Therefore, the heating control system provided in this embodiment can not only avoid safety problems caused by excessive battery temperature, but also realize dynamic control of the power of the heating element according to different usage scenarios of the battery, and can solve the problem of low temperature heating and low temperature heating rate caused by insufficient power of the heating element. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 Shown is a structural diagram of a heating control circuit shown as an exemplary embodiment;

[0042] Figure 2 Shown is a structural diagram of a heating control system shown as an exemplary embodiment;

[0043] Figure 3 The figure shows a control flow chart of a heating process of a heating control system according to an exemplary embodiment;

[0044] Figure 4 A control flow chart of another heating control system during a heating process is shown as an exemplary embodiment;

[0045] In the figure, Q1 is an input subcircuit, Q2 is a driving subcircuit, Q3 is a voltage stabilizing subcircuit, M is a heating element, Y is a power supply terminal, D1 is a first ground terminal, D2 is a second ground terminal, T1 is a first transistor, T2 is a triode, R1 is a first resistor, R2 is a second resistor, R3 is a third resistor, R4 is a fourth resistor, R5 is a fifth resistor, W is an isolation optocoupler, W is a voltage stabilizing tube, C is a capacitor, K is a controller, BMS is a battery management system, 10 is a battery, 100 is a battery cooling plate, 101 is a temperature sensor, and 102 is a thermal conductive adhesive. DETAILED DESCRIPTION

[0046] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0048] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or relative positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. Unless otherwise specified, the above-mentioned directional description can be flexibly set in the process of actual application under the condition that the relative positional relationship shown in the accompanying drawings is met.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In the present application, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, article or device including the element.

[0051] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0052] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0053] In low temperature environments, the discharge capacity and charging efficiency of power batteries will be significantly reduced, which will affect the vehicle's mileage and driving experience. In order to solve the impact of low temperature on power batteries, power batteries can currently be heated by heating elements to heat the battery cells to increase the operating temperature of the power batteries.

[0054] The working principle of the heater is to convert electrical energy into thermal energy using the electrothermal effect. Therefore, when using the heater for heating, if the power of the heater is too high, the heater may overheat, causing safety problems. At the same time, when charging at low temperatures, due to the limitation that the power of the external charging equipment is not high (home charging cables are generally around 3kW), the power of the heater cannot be too high. The power of the heater is generally less than 2kW, and the total output capacity of the charging equipment is lower than the power of the heater. This will cause the battery to fail to charge when the heating is turned on, or the temperature rise rate of the battery heated by the heater is low, much lower than that of a liquid thermal battery, resulting in slow charging, long low-temperature charging time leading to insufficient low-temperature power, or reverse discharge of the battery.

[0055] In order to solve the above technical problems, the embodiment of the present disclosure provides a heating control circuit, referring to Figure 1 , including: an input sub-circuit Q1 and a driving sub-circuit Q2.

[0056] The input sub-circuit Q1 is used to receive a first control signal, to be turned on and output a second control signal in response to the first control signal, and to be turned off in response to not receiving the first control signal;

[0057] The first end of the driving sub-circuit Q2 is connected to the heating element M, the heating element M is connected to the power supply terminal Y, the second end of the driving sub-circuit Q2 is connected to the first ground terminal D1, and the third end of the driving sub-circuit Q2 is connected to the input sub-circuit Q1 to receive the second control signal; the driving sub-circuit Q2 is used to be turned 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 be turned off when the input sub-circuit is turned off.

[0058] The heating control circuit provided in this embodiment is that after the input subcircuit Q1 in the heating control circuit receives the first control signal and turns on, and outputs the second control signal, the driving subcircuit Q2 turns on. Therefore, the heating control circuit can control the driving subcircuit Q2 to turn on through the first control signal, thereby heating the heating element M. In this way, the actual output average power of the heating element M can be dynamically adjusted by adjusting the input time of the first control signal, and the actual output average power of the heating element M can achieve variable power control from 0 to the maximum power output of the heating element M. Not only can the safety problem caused by the excessive temperature of the heating element M be avoided, but under low temperature conditions, the power of the heating element M can also be increased to increase the heating rate of the heating element M. Therefore, the heating control circuit can realize flexible adjustment of the power size of the heating element.

[0059] In some embodiments, when the heating element M needs to be heated, continue to refer to Figure 1 The first control signal may be input through the controller K, and the first control signal includes a high level signal. When the heating element M does not need to be heated, the first control signal does not need to be input, and in this case, the controller K inputs a low level signal.

[0060] In some embodiments, the heating element M includes multiple heating films. The multiple heating films can be connected in parallel, or in series, or in a combination of series and parallel. In the case where multiple heating films are connected in parallel, the positive and negative electrodes of the multiple heating films are connected respectively. The parallel connection method can ensure that each heating film can work independently. Even if one of the heating films fails, it will not affect the normal operation of other heating films; at the same time, the parallel connection can also adjust the power and number of the heating films according to actual needs to meet different heating needs. In the case where multiple heating films are connected in series, strict control of the current or voltage passing through each heating film can be achieved. In the case where multiple heating films are connected in series and in parallel, the advantages of parallel and series connections can be taken into account, that is, not only the reliability and flexibility of the system can be improved, but also specific current or voltage requirements can be met.

[0061] In some embodiments, reference Figure 1The driving subcircuit Q2 includes: a first transistor T1 and a first resistor R1; the control end of the first transistor T1 is connected to the third end of the driving subcircuit Q2, the first end of the first transistor T1 is connected to the first end of the driving subcircuit Q2, and the second end of the first transistor T1 is connected to the second end of the driving subcircuit Q2; the first end of the first resistor R1 is connected to the control end 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. By setting the first transistor T1 and the first resistor R1 to be turned on in response to the second control signal, a path is formed between the power supply terminal Y and the first ground terminal D1, and the heating element M is heated. Therefore, the heating control circuit has a simple structure and saves costs.

[0062] Exemplarily, the first transistor T1 includes an insulated gate bipolar transistor (IGBT), which is a composite fully controlled voltage-driven power semiconductor device that combines a metal oxide semiconductor field effect transistor (MOSFET) and a bipolar transistor (BJT). Therefore, the first transistor T1 uses an insulated gate bipolar transistor, which can make the first transistor T1 have the advantages of high input impedance, low driving power, simple control circuit, fast switching speed, high operating frequency, and low saturation voltage drop.

[0063] Exemplarily, the first resistor R1 includes a pull-down resistor. Since the pull-down resistor can connect an uncertain signal to the first ground terminal D1 through a resistor, the signal at the second end of the first resistor R1 is fixed at a low level. This ensures that when there is no valid signal input, the second end of the first resistor R1 will not malfunction due to external interference due to being in a suspended state.

[0064] In some embodiments, continue to refer to Figure 1 , the input subcircuit Q1 includes: an isolation optocoupler W; the positive electrode of the input terminal of the isolation optocoupler W is used to receive the first control signal, the negative electrode of the input terminal of the isolation optocoupler W is connected to the second ground terminal D2, the positive electrode of the output terminal of the isolation optocoupler W is used to receive the voltage stabilization signal, and the negative electrode of the output terminal of the isolation optocoupler W is connected to the third terminal of the driving subcircuit Q2. Among them, the isolation optocoupler W includes a light-emitting device (such as a light-emitting diode LED) and a light-receiving device (such as a phototransistor or a photoresistor). The heating control circuit adopts the isolation optocoupler W, and there is no direct electrical connection between the light-emitting device and the light-receiving device, so that electrical isolation between circuits can be achieved, interference and damage between circuits can be effectively prevented, and the stability and reliability of the heating control circuit can be improved.

[0065] In some embodiments, continue to refer to Figure 1The heating control circuit also includes: a voltage stabilizing subcircuit Q3; the voltage stabilizing subcircuit Q3 is connected to the power supply terminal Y and to the positive electrode of the input terminal of the isolation optical coupler W; the voltage stabilizing subcircuit Q3 is used to receive the power signal output by the power supply terminal Y, and provide the voltage stabilizing signal to the isolation optical coupler W based on the power signal. In this way, the circuit forms a high-voltage to low-voltage stabilizing circuit, which can provide a stable voltage for the first transistor T1, and has a simple structure, avoids the use of a dedicated isolation power module, and saves costs.

[0066] In some embodiments, the voltage stabilizing subcircuit Q3 includes: a transistor T2, a voltage stabilizing diode W and a capacitor C; the positive electrode of the voltage stabilizing diode W is connected to the control end of the transistor T2, and the negative electrode of the voltage stabilizing diode W is connected to the first ground end D1; the first end of the transistor T2 is connected to the power supply end Y, and the second end of the transistor T2 is connected to the first electrode of the capacitor C and the positive electrode of the output end of the isolation optocoupler W; the second electrode of the capacitor C is connected to the first ground end D1.

[0067] In some embodiments, the first end of the transistor T2 is a collector, the second end of the transistor T2 is an emitter, and the control end of the transistor T2 is a base.

[0068] In some embodiments, the voltage stabilizing subcircuit Q3 further includes: a second resistor R2 and a third resistor R3; the first ends of the second resistor R2 and the third resistor R3 are both connected to the power supply terminal Y; the second end of the second resistor R2 is connected to the first end of the transistor T2; the second end of the third resistor R3 is connected to the control end of the transistor T2 and the positive electrode of the voltage stabilizing tube W. Among them, the second resistor R2 can limit the power in the heating control circuit to ensure the normal operating temperature of each part of the circuit components, and the third resistor R3 can play a role in voltage division to stabilize the voltage between the third resistor R3 and the voltage stabilizing tube W, which is conducive to forming a high-voltage to low-voltage voltage stabilizing circuit in the heating control circuit.

[0069] In some embodiments, the second resistor R2 includes a power resistor, and the third resistor R3 includes a voltage-dividing resistor. Specifically, the collector of the transistor T2 is connected to the power supply terminal Y through the power resistor, the emitter of the transistor T2 is respectively connected to the first electrode of the capacitor C and the positive electrode of the output terminal of the isolation optocoupler W, the second electrode of the capacitor C is connected to the first ground terminal D1, the control end of the transistor T2 is simultaneously connected to the voltage regulator W and the third resistor R3, the other end of the voltage regulator W is connected to the first ground terminal D1, and the other end of the third resistor R3 is connected to the power supply terminal Y. The voltage regulator W and the third resistor R3 form a voltage stabilizing circuit, and a stable voltage is output at the connection point between the voltage regulator W and the third resistor R3. For example, taking the base of transistor T2 with a 16V voltage input as an example, when the base voltage of transistor T2 is higher than the emitter voltage of 0.6V, transistor T2 is turned on, and the current enters the collector of transistor T2 from the power supply terminal Y through the second resistor R2, and is output from the emitter to charge the capacitor C, and the voltage of the emitter rises. When the base voltage and the emitter voltage are lower than 0.6V, transistor T2 is turned off to form a regulated power supply of about 16V. In this way, the heating control circuit forms a high-voltage to low-voltage regulated circuit to provide a control power supply for the first transistor T1. The structure is simple, and the use of a dedicated isolation power supply module is avoided, and the cost is low.

[0070] In some embodiments, the input subcircuit Q1 further includes: a fourth resistor R4 and a fifth resistor R5; the fourth resistor R4 is connected to the positive electrode of the input end of the isolation optocoupler W; the fifth resistor R5 is connected between the negative electrode of the output end of the isolation optocoupler W and the third end of the driving subcircuit Q2. The magnitude of the current in the circuit can be controlled by the fourth resistor and the fifth resistor to ensure that the isolation optocoupler can be normally turned on.

[0071] In some embodiments, the fourth resistor R4 includes a current limiting resistor, and the fifth resistor R5 includes a current limiting resistor.

[0072] In some embodiments, a heating control system is also provided, in combination with reference Figure 1 and Figure 2 , comprising: the heating control circuit in any of the above embodiments, a heating element M and a controller K. The heating element M is connected to the driving subcircuit in the heating control circuit; the heating element M is used to heat the battery 10, and the battery 10 is connected to the heating element M as a power supply terminal Y; the controller K is connected to the input subcircuit; the controller K is used to provide a first control signal to the input subcircuit in the heating control circuit, and the first control signal is used to control the input subcircuit to be turned on.

[0073] The controller K may include a battery management system BMS and a first switch K1, the battery management system BMS is configured to input a first control signal, and the first switch K1 is configured to control the disconnection and conduction between the battery management system BMS and the input subcircuit Q1.

[0074] In the heating control system provided in this embodiment, the heating element M is used to heat the battery 10. Therefore, when the battery 10 is under low temperature conditions, the input time of the first control signal can be increased to increase the actual output average power of the heating element M, increase the heating rate of the heating element M, and then increase the heating rate of the battery 10 to improve the charging and discharging performance of the battery 10. When the temperature of the battery 10 is too high, the first control signal can be stopped from being input to stop heating the heating element M, and then stop heating the battery 10. Alternatively, the input time of the first control signal can be reduced to reduce the actual output average power of the heating element M, reduce the heating rate of the heating element M, and then reduce the heating rate of the battery 10 to avoid safety problems caused by excessive battery temperature. Therefore, the heating control system provided in this embodiment can not only avoid safety problems caused by excessively high battery temperature 10, but also dynamically control the power of the heating element M according to different usage scenarios of the battery 10 (for example, driving, stationary or charging), which can solve the problem of low temperature heating and low temperature heating rate caused by insufficient power of the heating element M.

[0075] In some embodiments, the heating control system further includes: a temperature sensor 101, which is used to detect the temperature of the battery 10 and send the detected temperature value to the controller K; the controller K is used to provide a first control signal to the input subcircuit based on the temperature of the battery 10 being less than or equal to a first temperature threshold (for example, 60°C); and stop providing the first control signal to the input subcircuit based on the temperature of the battery being greater than or equal to the first temperature threshold. By setting the temperature sensor 101, the temperature of the battery can be obtained in real time and accurately, so that it is convenient to realize dynamic control of the actual output average power of the heating element M in a timely manner, and it can avoid safety problems caused by excessively high temperature of the battery 10, or problems of poor battery charging and discharging performance caused by excessively low temperature of the battery 10.

[0076] In some embodiments, the controller K includes a battery management system BMS and a first switch K1, the battery management system BMS is configured to input a first control signal, and the first switch K1 is configured to control the disconnection and conduction between the battery management system BMS and the input subcircuit Q1.

[0077] In some embodiments, the heating element M is arranged on the battery cooling plate 100 and connected to the bottom of the battery 10 through the thermal conductive adhesive 102. A temperature sensor 101 is installed between the bottom of the battery 10 and the heating element M and is connected to the battery management system BMS through an acquisition line for measuring the bottom temperature of the battery 10.

[0078] In some embodiments, reference Figure 3The controller is specifically used to continuously provide the first control signal to the input subcircuit when the first preset condition is met; until the temperature of the battery 10 is greater than or equal to the first temperature threshold, stop providing the first control signal to the input subcircuit Q1; wherein the first preset condition includes: the battery is connected to the charging port, the difference between the maximum power of the charging port and the maximum power of the battery is greater than or equal to the maximum power of the heating element, and the temperature of the battery is less than or equal to the first temperature threshold; or, the battery is discharged 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, and the temperature of the battery is less than or equal to the first temperature threshold; or, the battery is in a state of neither charging nor discharging to the load, the maximum power of the battery 10 is greater than or equal to the maximum power of the heating element, and the temperature of the battery is less than or equal to the first temperature threshold. In this way, safety problems caused by excessive battery temperature can be avoided.

[0079] In one possible implementation, reference Figure 4 , the controller is specifically used to intermittently provide the first control signal to the input subcircuit when the second preset condition is met; until the temperature of the battery is greater than or equal to the first temperature threshold, stop providing the first control signal to the input subcircuit; wherein the second preset condition includes: the battery is connected to the charging port, the difference between the maximum power of the charging port and the maximum power of the battery is less than the maximum power of the heating element (in this case, the heating element cannot be supported to work at full power), and the temperature of the battery is less than or equal to the first temperature threshold; or, the battery is discharged to the load, the difference between the maximum power of the battery and the maximum power of the load is less than the maximum power of the heating element, and the temperature of the battery is less than or equal to the first temperature threshold. In this way, not only can the safety problem caused by the excessive temperature of the battery 10 be avoided, but also when the battery is charged and the maximum power of the external charging port is insufficient, the actual output average power of the heating element can be avoided to be too large, resulting in the battery being unable to charge when the battery is heated; or, when the vehicle is driving, the reverse discharge of the battery causes the problem of insufficient vehicle power.

[0080] In a possible implementation, in the process of intermittently providing the first control signal to the input subcircuit, each time the first control signal is provided, it lasts for a first preset time length t1, and there is a second preset time length t2 between two adjacent first control signal providings. In this way, the actual output average power of the heating element M can be dynamically adjusted.

[0081] In a possible implementation manner, 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 M, and R is the resistance of the heating element M; 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. Wherein, t1 and t need to be obtained through actual system calibration. If t1 is too large, the instantaneous heating power will be too large, causing the battery 10 to perform reverse discharge as a whole. If t1 is too small, the heating control system may not respond and high-frequency interference may occur.

[0082] The heating control system provided in this embodiment can realize variable power control of the heating element M to meet the battery heating needs of high-power heating scenarios, achieve a larger battery temperature rise rate, and even better than the heating rate of water heating; as well as meet the battery heating needs of low-power heating scenarios, realize low-power heating under limited power conditions, and prevent the problem of reverse battery discharge during charging and heating.

[0083] The heating control system provided in this embodiment can meet various scenarios such as battery 10 charging, driving, and stationary. The heating power can be adjusted arbitrarily, and the maximum power can reach more than 16kW. The fastest temperature rise rate of battery 10 heating can reach 2°C / min, and the minimum power can reach less than 50W. It can be used to keep the battery warm in low temperature environments. At the same time, it can meet the scenarios where the charging equipment capacity is insufficient, such as home charging. By dynamically adjusting the heating power, the problem of overall battery discharge in the process of charging and heating can be prevented.

[0084] The embodiment of the present disclosure further provides a vehicle, comprising: a heating control system according to any of the above embodiments and a battery 10, wherein the battery 10 is connected as a power supply terminal Y to a heating element M in the heating control system, and the heating element M is connected to the battery 10.

[0085] Contact settings.

[0086] The heating element M is arranged in contact with the battery 10, which can be, for example, Figure 2 The heating element M is arranged on the battery cooling plate 100, and a thermal conductive adhesive 102 is provided between the heating element M and the battery cooling plate 100. The heating element M is connected to the bottom of the battery 10 through the thermal conductive adhesive 102. A temperature sensor 101 is installed between the bottom of the battery 10 and the heating element M. The temperature sensor 101 is connected to the battery management system BMS through an acquisition line to measure the temperature of the bottom of the battery.

[0087] In some embodiments, the heating element M includes a plurality of heating films, and the plurality of heating films are evenly arranged at the bottom of the entire battery 10, which is conducive to uniform heating of the entire battery 10.

[0088] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A heating control circuit, characterized in that: include: an input subcircuit (Q1) for receiving a first control signal, being turned on and outputting a second control signal in response to the first control signal, and being turned off in response to not receiving the first control signal; a driving subcircuit (Q2), wherein a first end of the driving subcircuit (Q2) is connected to a heating element (M), the heating element (M) is connected to a power supply end (Y), a second end of the driving subcircuit (Q2) is connected to a first ground end (D1), and a third end of the driving subcircuit (Q2) is connected to the input subcircuit (Q1) to receive the second control signal; The driving subcircuit (Q2) is used to be turned 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 turned off when the input subcircuit is turned off.

2. The heating control circuit according to claim 1, characterized in that: The driving subcircuit (Q2) comprises: a first transistor (T1) and a first resistor (R1); The control end of the first transistor (T1) is connected to the third end of the driving sub-circuit (Q2), the first end of the first transistor (T1) is connected to the first end of the driving sub-circuit (Q2), and the second end of the first transistor (T1) is connected to the second end of the driving sub-circuit (Q2); A first end of the first resistor (R1) is connected to a control end of the first transistor (T1), and a second end of the first resistor (R1) is connected to a second end of the first transistor (T1).

3. The heating control circuit according to claim 1, characterized in that: The input subcircuit (Q1) comprises: an isolation optocoupler (W); The positive pole of the input terminal of the isolation optocoupler (W) is used to receive the first control signal, the negative pole of the input terminal of the isolation optocoupler (W) is connected to the second ground terminal (D2), the positive pole of the output terminal of the isolation optocoupler (W) is used to receive the voltage stabilization signal, and the negative pole of the output terminal of the isolation optocoupler (W) is connected to the third terminal of the drive sub-circuit (Q2).

4. The heating control circuit according to claim 3, characterized in that: The heating control circuit further comprises: a voltage stabilizing subcircuit (Q3); The voltage stabilizing subcircuit (Q3) is connected to the power supply end (Y) and to the positive input end of the isolation optical coupler (W); The voltage stabilizing subcircuit (Q3) is used to receive the power supply signal output by the power supply terminal (Y), and provide the voltage stabilizing signal to the isolation optical coupler (W) based on the power supply signal.

5. The heating control circuit according to claim 4, characterized in that: The voltage stabilizing subcircuit (Q3) comprises: a triode (T2), a voltage stabilizing tube (W) and a capacitor (C); The positive electrode of the voltage regulator tube (W) is connected to the control end of the triode (T2), and the negative electrode of the voltage regulator tube (W) is connected to the first grounding end (D1); The first end of the transistor (T2) is connected to the power supply end (Y), and the second end of the transistor (T2) is connected to the first electrode of the capacitor (C) and the positive electrode of the output end of the isolation optical coupler (W); The second electrode of the capacitor (C) is connected to the first ground terminal (D1).

6. The heating control circuit according to claim 5, characterized in that: The voltage stabilizing subcircuit (Q3) further includes: a second resistor (R2) and a third resistor (R3); The first ends of the second resistor (R2) and the third resistor (R3) are both connected to the power supply terminal (Y); The second end of the second resistor (R2) is connected to the first end of the transistor (T2); The second end of the third resistor (R3) is connected to the control end of the transistor (T2) and the positive electrode of the voltage regulator (W).

7. The heating control circuit according to any one of claims 3 to 6, characterized in that: The input subcircuit (Q1) further includes: a fourth resistor (R4) and a fifth resistor (R5); The fourth resistor (R4) is connected to the positive electrode of the input end of the isolation optical coupler (W); The fifth resistor (R5) is connected between the negative electrode of the output terminal of the isolation optical coupler (W) and the third terminal of the driving sub-circuit (Q2).

8. A heating control system, characterized in that: include: The heating control circuit according to any one of claims 1 to 7; A heating element (M) connected to the driving subcircuit (Q2) in the heating control circuit; the heating element (M) is used to heat the battery (10), and the battery (10) is connected to the heating element (M) as a power supply terminal (Y); A controller (K) is connected to the input subcircuit (Q1); the controller (K) is used to provide a first control signal to the input subcircuit (Q1) in the heating control circuit, and the first control signal is used to control the conduction of the input subcircuit (Q1).

9. The heating control system according to claim 8, characterized in that: The heating control system further comprises: a temperature sensor (101) for detecting the temperature of the battery (10) and sending the detected temperature value to the controller (K); The controller (K) is used to provide the first control signal to the input subcircuit (Q1) based on the temperature of the battery (10) being less than or equal to a first temperature threshold; Based on the temperature of the battery (10) being greater than or equal to a first temperature threshold, supplying the first control signal to the input subcircuit (Q1) is stopped.

10. The heating control system according to claim 9, characterized in that: The controller (K) is specifically configured to, when a first preset condition is met, continuously provide the first control signal to the input subcircuit (Q1); until the temperature of the battery (10) is greater than or equal to a first temperature threshold, stop providing the first control signal to the input subcircuit (Q1); Wherein, 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 a 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 neither charging nor discharging to a 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.

11. The heating control system according to claim 9, characterized in that: The controller (K) is specifically configured to, when a second preset condition is met, intermittently provide the first control signal to the input subcircuit (Q1); until the temperature of the battery (10) is greater than or equal to a first temperature threshold, stop providing the first control signal to the input subcircuit (Q1); Wherein, 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 a 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.

12. The heating control system according to claim 11, characterized in that: In the process of intermittently providing the first control signal to the input sub-circuit (Q1), each time the first control signal is provided, it lasts for a first preset time length, and a second preset time length is separated from two adjacent times of providing the first control signal.

13. The heating control system according to claim 12, characterized in that: The first preset time length is t1, the second preset time length is t2, t1 / (t1+t2)=P×U 2 / R; wherein 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.

14. A vehicle, characterized in that: include: The heating control system according to any one of claims 8 to 13; A battery (10), the battery (10) being connected to a heating element (M) in the heating control system as a power supply terminal (Y), the heating element (M) being arranged in contact with the battery (10).

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