Battery self-heating circuit, control method, equipment, system, vehicle and medium

Abstract

The embodiment of the invention provides a battery self-heating circuit, a control method, equipment, a system, a vehicle and a medium. The battery self-heating circuit comprises a motor, an inverter and a capacitor, the inverter, the motor and the capacitor form a resonance circuit, and the capacitor is also used for being connected with the battery pack, so that the battery pack can be self-heated by utilizing charging and discharging of the resonance circuit and the battery pack in a low-temperature environment, and the use performance of the battery pack at a low temperature is improved; the voltage at the two ends of the capacitor is configured to change based on the resonant frequency of the resonant circuit, so that the charging and discharging current of the resonant circuit can be increased, the flowing-out and flowing-in current of the battery pack is increased, and the battery heating power is maximized.

Description

Technical Field

[0001] This invention relates to the field of motor drive technology, and in particular to a battery self-heating system, a battery self-heating control method, a vehicle, and a medium. Background Technology

[0002] With the development and rapid popularization of electric vehicles, lithium-ion power batteries are widely used. Due to the inherent characteristics of batteries, low-temperature environments affect their charging and discharging efficiency. Lithium-ion batteries are particularly sensitive to low temperatures; at low temperatures, the internal resistance of lithium-ion batteries increases sharply, significantly limiting their discharge capacity and charging / discharging performance. This results in insufficient power performance and a significantly shortened driving range for electric vehicles in low-temperature environments. Furthermore, batteries are almost impossible to charge below -20°C; forcing them to charge can easily cause internal short circuits, posing safety hazards. "Low-temperature anxiety" has become a major pain point affecting user experience in the marketization of electric vehicles. Therefore, improving battery performance at low temperatures is one of the key issues that urgently needs to be addressed. Summary of the Invention

[0003] To address the aforementioned problems, embodiments of the present invention disclose a battery self-heating circuit, control method, device, system, vehicle, and medium.

[0004] In a first aspect, embodiments of the present invention provide a battery self-heating circuit, comprising: a motor, an inverter, and a capacitor;

[0005] The inverter, the motor, and the capacitor form a resonant circuit, and the capacitor is also used to connect the battery pack.

[0006] The voltage across the capacitor is configured to vary based on the resonant frequency of the resonant circuit.

[0007] Optionally, the inverter includes multi-phase bridge arms, and the resonant frequency of the resonant circuit varies based on the phase shift angle of the multi-phase bridge arms.

[0008] Optionally, the phase shift angle of the multiphase bridge arm varies based on the frequency of a preset audio signal.

[0009] Optionally, the voltage across the capacitor is configured to vary based on the amplitude of a preset audio signal.

[0010] Optionally, the voltage across the capacitor is controlled by adjusting the duty cycle of the modulation signal corresponding to the inverter.

[0011] Optionally, the battery self-heating circuit has a first operating mode, in which the voltage across the capacitor is configured to vary based on the resonant frequency of the resonant circuit in the first mode.

[0012] Optionally, if the self-heating power of the battery self-heating circuit is less than a preset power threshold, the battery self-heating circuit is in the first mode.

[0013] Optionally, the battery pack, the capacitor, the inverter, and the motor are connected in series to form a self-heating circuit, so that the capacitor participates in the charging or discharging process of the battery pack.

[0014] Optionally, one end of the battery pack is connected to one end of the capacitor, the other end of the capacitor is connected to the inverter, the midpoint of each phase arm of the inverter is connected to the multiphase motor coil of the motor, the multiphase motor coil is connected to the neutral point of the motor, and the neutral point of the motor is connected to the other end of the battery pack.

[0015] Optionally, a first switch is connected between the neutral point of the motor and the battery pack, and a second switch is connected between the capacitor and the battery pack;

[0016] The battery self-heating circuit has a first operating mode, in which the first switch and the second switch are configured to be turned on in the first mode.

[0017] Optionally, it may also include a control module;

[0018] The control module is used to control the voltage across the capacitor to change according to the resonant frequency of the resonant circuit.

[0019] Secondly, embodiments of the present invention provide a battery self-heating circuit control method, applied to the aforementioned battery self-heating circuit, the method comprising:

[0020] The voltage across the capacitor is controlled to vary, and the voltage across the capacitor is configured to vary based on the resonant frequency of the resonant circuit.

[0021] Optionally, the method further includes:

[0022] The resonant frequency of the resonant circuit is determined based on the phase misalignment angle of the multiphase bridge arm of the inverter.

[0023] Optionally, the method further includes:

[0024] The phase shift angle of the multiphase bridge arm of the inverter is controlled according to the frequency of the preset audio.

[0025] Optionally, controlling the voltage across the capacitor to change includes:

[0026] The voltage across the capacitor is controlled according to the preset audio amplitude.

[0027] Optionally, the voltage across the capacitor is controlled by adjusting the duty cycle of the modulation signal corresponding to the inverter.

[0028] Optionally, the battery self-heating circuit has a first operating mode, in which the voltage across the capacitor is configured to vary based on the resonant frequency of the resonant circuit in the first mode.

[0029] Optionally, if the self-heating power of the battery self-heating circuit is less than a preset power threshold, the battery self-heating circuit is in the first mode.

[0030] Optionally, the battery pack, the capacitor, the inverter, and the motor are connected in series to form a self-heating circuit, so that the capacitor participates in the charging or discharging process of the battery pack.

[0031] Optionally, one end of the battery pack is connected to one end of the capacitor, the other end of the capacitor is connected to the inverter, the midpoint of each phase arm of the inverter is connected to the multiphase motor coil of the motor, the multiphase motor coil is connected to the neutral point of the motor, and the neutral point of the motor is connected to the other end of the battery pack.

[0032] Optionally, a first switch is connected between the neutral point of the motor and the battery pack, and a second switch is connected between the capacitor and the battery pack;

[0033] The battery self-heating circuit has a first operating mode, in which the first switch and the second switch are configured to be turned on in the first mode.

[0034] Thirdly, the present invention discloses an electronic device including a processor connected to a memory storing a computer program, the processor being used to execute the computer program to implement the above-described battery self-heating control method.

[0035] Fourthly, the present invention discloses a battery self-heating system, including the battery self-heating circuit described above, and the battery self-heating system further includes a battery pack, which is connected to the battery self-heating circuit.

[0036] Fifthly, the present invention discloses a vehicle that includes the aforementioned battery self-heating circuit, or the aforementioned electronic equipment, or the aforementioned battery self-heating system.

[0037] In a sixth aspect, the present invention discloses a computer-readable storage medium comprising a computer program that, when run on a computer, causes the computer to perform the above-described battery self-heating control method.

[0038] The embodiments of the present invention have the following advantages:

[0039] The battery self-heating circuit includes a motor, an inverter, and a capacitor. The inverter, motor, and capacitor form a resonant circuit. The capacitor is also used to connect the battery pack, so that the battery pack can be self-heated by the charging and discharging of the resonant circuit and the battery pack in low-temperature environments, thereby improving the battery pack's performance at low temperatures. The voltage across the capacitor is configured to vary based on the resonant frequency of the resonant circuit, thereby increasing the charging and discharging current of the resonant circuit, and thus increasing the current flowing out of and into the battery pack, maximizing the battery heating power. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a structural block diagram of a battery self-heating circuit according to an embodiment of the present invention;

[0042] Figure 2 This is a structural block diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0043] Figure 3 This is a circuit diagram of a battery self-heating circuit according to an embodiment of the present invention;

[0044] Figure 4 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0045] Figure 5 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0046] Figure 6 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0047] Figure 7 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0048] Figure 8 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0049] Figure 9 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0050] Figure 10 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0051] Figure 11 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0052] Figure 12 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0053] Figure 13 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0054] Figure 14 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0055] Figure 15 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0056] Figure 16 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0057] Figure 17 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0058] Figure 18 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0059] Figure 19 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0060] Figure 20 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention;

[0061] Figure 21 This is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention.

[0062] Explanation of reference numerals in the attached figures:

[0063] Battery self-heating circuit 10, motor 11, inverter 12, capacitor C1, battery pack E1, control module 13. Detailed Implementation

[0064] Electric vehicles often experience slow charging, reduced range, and reluctance to use air conditioning or heating in winter. When ambient temperatures are extremely low, the internal batteries of electric vehicles may encounter the following problems: At low temperatures, lithium ions tend to deposit on the negative electrode, losing their electrical activity and potentially causing safety issues; during charging at low temperatures, lithium ions are prone to depositing on the negative electrode, becoming dead lithium, significantly reducing the battery's capacity. Furthermore, with continued use, these deposited lithium ions grow larger and larger, potentially causing internal short circuits and posing safety hazards; at low temperatures, the battery's discharge capacity is limited, which is detrimental to driving.

[0065] Existing technologies typically utilize PTC heaters or electric heating wire heaters to heat the coolant in the battery cooling circuit at low temperatures, thereby heating the battery cells to a predetermined temperature. Alternatively, heat can be generated by an air conditioning compressor to heat the cooling circuit and thus the battery. However, in ultra-low temperature environments, heaters or compressors have difficulty starting; they need to heat themselves before they can start and heat the battery, resulting in long heating times.

[0066] This invention proposes a battery self-heating circuit to improve the performance of electric vehicle batteries at low temperatures. To achieve this goal, the battery self-heating circuit of this invention includes a motor, an inverter, and a capacitor. The inverter, motor, and capacitor form a resonant circuit, and the capacitor is connected to the battery pack. This allows the battery pack to self-heat in low-temperature environments by utilizing the resonant circuit and the charging and discharging of the battery pack, thereby improving its performance at low temperatures. Simultaneously, the voltage across the capacitor is controlled based on the resonant frequency of the resonant circuit, which increases the charging and discharging current of the resonant circuit, thereby increasing the current flowing into and out of the battery pack and maximizing the battery heating power.

[0067] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0068] Reference Figure 1 The diagram shows a structural block diagram of a battery self-heating circuit according to an embodiment of the present invention. The battery self-heating circuit 10 may specifically include: a motor 11, an inverter 12, and a capacitor C1.

[0069] The inverter 12, the motor 11 and the capacitor C1 form a resonant circuit, and the capacitor is also used to connect the battery pack E1.

[0070] The voltage across capacitor C1 is configured to vary based on the resonant frequency of the resonant circuit.

[0071] In this embodiment of the invention, the equivalent inductance and capacitance of the motor can form a resonant circuit. The inductance of the motor's equivalent inductance can be controlled by an inverter, and the capacitor is connected to the battery pack. When the voltage across the capacitor changes based on the resonant frequency of the resonant circuit, the self-heating power of the battery self-heating circuit can be adjusted. Specifically, when the capacitor voltage deviates from the resonant frequency of the resonant circuit, the current flowing through the resonant circuit decreases, and the heat generated by the battery self-heating circuit decreases; when the capacitor voltage approaches the resonant frequency of the resonant circuit, the current flowing through the resonant circuit increases, and the heating power of the battery self-heating circuit increases.

[0072] This invention utilizes a resonant circuit composed of an inverter, a motor, and a capacitor to assist the battery pack in self-heating at low temperatures, thereby improving the battery pack's performance at low temperatures. By controlling the voltage across the capacitor based on the resonant frequency of the resonant circuit, the charging and discharging current of the resonant circuit can be increased, thereby increasing the current flowing out of and into the battery pack and maximizing the battery heating power.

[0073] Reference Figure 2 The diagram shows a structural block diagram of another battery self-heating circuit according to an embodiment of the present invention. The battery self-heating circuit 10 also includes a control module 13.

[0074] The control module 13 is used to control the voltage across the capacitor C1 to change according to the resonant frequency of the resonant circuit.

[0075] In this embodiment of the invention, the control module 13 can be connected to the battery pack E1, the motor 11, the inverter 12, and the capacitor C1, respectively, and is used to control the voltage across the capacitor C1 according to the resonant frequency of the resonant circuit. The control circuit can monitor the temperature of the battery pack in real time using a temperature sensor (such as a thermistor or thermocouple), and decide whether to start or stop the battery self-heating process based on a preset temperature threshold and the battery pack's operating status. Simultaneously, the control circuit can also monitor parameters such as the battery pack's voltage and current to prevent overheating, overcurrent, and other abnormal conditions, ensuring the safety of the battery pack.

[0076] It should be noted that in the battery self-heating circuit, the voltage across the capacitor is more than twice the voltage of the battery pack. If the voltage value of more than twice the battery pack exceeds the preset maximum voltage of the capacitor, the control circuit can perform circuit control according to the preset maximum voltage of the capacitor, so as to maximize the range of phase voltages that the motor can use while expanding the range of vehicle torque and power.

[0077] The voltage across the capacitor refers to its peak voltage or amplitude voltage, while the battery pack voltage refers to its average voltage or nominal voltage. Capacitors smooth DC voltage. To ensure circuit safety and reliability, capacitors are typically designed to withstand voltages higher than the battery pack voltage to ensure stable operation under various working conditions and prevent damage from transient voltage spikes.

[0078] Reference Figure 3 The diagram shows a circuit diagram of a battery self-heating circuit according to an embodiment of the present invention. The inverter 12 includes multi-phase bridge arms, and the resonant frequency of the resonant circuit varies based on the phase reversal angle of the multi-phase bridge arms. Specifically, each phase bridge arm of the inverter 12 includes two power switches, and the resonant frequency of the resonant circuit varies based on the phase reversal angle of the multi-phase bridge arms and the operating frequency of the power switches.

[0079] In this embodiment of the invention, the resonant frequency of the resonant circuit can be determined based on the phase reversal angle of the multiphase bridge arm and the operating frequency of the power switch. The correspondence between the resonant frequency of the resonant circuit, the phase reversal angle of the multiphase bridge arm, and the operating frequency of the power switch can be calibrated in advance by technicians in a laboratory. Specifically, during the experimental testing process, the current battery pack model, capacitor model, power switch model, and motor model can be recorded, and the resonant frequency of the resonant circuit corresponding to different phase reversal angles of the multiphase bridge arm and the operating frequency of the power switch can be measured. Thus, during the self-heating process of the battery self-heating circuit, the resonant frequency of the resonant circuit can be determined based on the battery pack model, capacitor model, power switch model, motor model, and the phase reversal angle of the multiphase bridge arm and the operating frequency of the power switch.

[0080] In one embodiment, the phase shift angle of the multiphase bridge arm varies based on the frequency of a preset audio signal; the voltage across the capacitor is configured to vary based on the amplitude of the preset audio signal; and the voltage across the capacitor is controlled by adjusting the duty cycle of the modulation signal corresponding to the inverter.

[0081] In this embodiment of the invention, the preset audio can be an analog signal whose amplitude varies with time, and the modulation signal can be a PWM (Pulse Width Modulation) signal. The preset audio can be converted into PWM to achieve digital processing and output of the audio. Based on the amplitude of the preset audio, the duty cycle of the PWM signal can be adjusted, and the duty cycle of the PWM signal determines the ratio of the on-time to the cycle time of the power switch. By adjusting the duty cycle, the average voltage output by the inverter can be changed, thereby controlling the voltage across the capacitor. Specifically, the larger the amplitude of the preset audio, the higher the duty cycle of the PWM signal; the smaller the amplitude of the preset audio, the lower the duty cycle of the PWM signal. The preset audio can be pleasant music.

[0082] The frequency of the PWM signal determines the switching frequency of the power switch. By adjusting the frequency of the PWM signal, the operating frequency of the power switch can be controlled. For example, setting the PWM signal frequency to 10kHz means the switching frequency of the power switch device is 10kHz. Increasing the PWM signal frequency increases the operating frequency of the power switch, while decreasing it decreases it. A lower operating frequency results in a larger phase current ripple in the power switch's bridge arm, which can increase the heat generated by the battery pack.

[0083] The phase shift angle of the multiphase bridge arm is determined based on the preset audio frequency. Then, the resonant frequency of the resonant circuit is determined based on the phase shift angle of the multiphase bridge arm. Finally, the frequency of the voltage across the capacitor is controlled based on the resonant frequency of the resonant circuit, so that the voltage across the capacitor can oscillate according to the preset audio frequency.

[0084] This invention uses pleasant music to set a pulse width modulation signal, which in turn controls the operating frequency of the power switches of the multi-phase bridge arm of the inverter, causing the voltage across the capacitor to change according to the amplitude of a preset audio value. Simultaneously, the frequency of the voltage across the capacitor is controlled based on the resonant frequency of the resonant circuit, causing the voltage across the capacitor to oscillate according to the frequency of the preset audio value. Thus, while changing the self-heating power of the battery self-heating circuit, pleasant music can be emitted to mask noise and improve the user's driving experience.

[0085] In one embodiment, the battery self-heating circuit operates in a first mode, wherein the voltage across the capacitor is configured to vary based on the resonant frequency of the resonant circuit in the first mode; specifically, when the self-heating power of the battery self-heating circuit is less than a preset power threshold, the battery self-heating circuit is in the first mode.

[0086] like Figure 3 As shown, when the battery self-heating circuit is in the first mode, one end of the battery pack E1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the inverter 12. The midpoint of each phase arm of the inverter 12 is connected to the multi-phase motor coil of the motor 11, and the multi-phase motor coil is connected to the neutral point of the motor 11. The neutral point of the motor 11 is connected to the other end of the battery pack E1. The battery pack E1, the capacitor C2, the inverter 12, and the motor 11 constitute a self-heating circuit so that the capacitor C1 participates in the charging or discharging process of the battery pack E1.

[0087] In this embodiment of the invention, when the self-heating power of the battery self-heating circuit is less than a preset power threshold, the control circuit determines that the self-heating power of the circuit needs to be increased. At this time, a capacitor can be connected in series between the battery pack and the inverter. The voltage provided by the battery pack can be boosted and provided to the capacitor. The boosted battery pack voltage can increase the phase voltage range of the inverter. At the same time, by controlling the voltage across the capacitor based on the resonant frequency of the resonant circuit, the charging and discharging current of the self-heating circuit can be increased, thereby increasing the current flowing out of and into the battery pack, and thus increasing the heating power of the self-heating circuit.

[0088] In one embodiment, a first switch is connected between the neutral point of the motor 11 and the battery pack E1, and a second switch is connected between the capacitor C1 and the battery pack E1; the first switch and the second switch are configured to be turned on in the first mode.

[0089] like Figure 3As shown, the first switch can be switch K5, and the second switch can be switch K2. When switches K5 and K1 are engaged, switches K0, K2, K3, and K4 are disengaged. The positive lead of battery pack E1 is connected to the neutral line N of motor 11 through switch K5. When the battery pack is discharging, the current flows out from the positive terminal of the battery pack, passes through switch K5, the motor, the upper half of the inverter bridge arm, capacitor C1, and switch K1 in sequence, and then returns to the negative terminal of the battery pack. When the battery pack is charging, the current flows in the opposite direction to the battery pack discharge.

[0090] The battery self-heating circuit may also include a DC charging / discharging port, which is connected in parallel with capacitor C1 via switches K3 and K4. The DC charging / discharging port serves as the interface for energy exchange between the battery self-heating circuit and external power sources and devices, providing multiple functions such as charging, discharging, energy recovery, and data communication. When the battery pack is charging, it can be connected to an external DC power source (such as a charging station or solar panel) for rapid charging; when the battery pack is discharging, it can output electrical energy through the DC charging / discharging port to power external devices (such as power tools or emergency power supplies).

[0091] This invention allows control of the self-heating power of the battery self-heating circuit through at least one of the following: the operating frequency of the inverter's power switch, the amplitude of the voltage change across the capacitor, or the frequency of the capacitor voltage. When the operating frequency of the inverter's power switch is reduced, or the magnitude and frequency of the voltage change across the capacitor are controlled based on the resonant frequency of the resonant circuit, causing a significant increase in the current flowing into and out of the battery pack, the internal resistance of the battery pack heats up during charging and discharging, thereby improving the heating efficiency of the battery pack.

[0092] This invention allows for adjustments to the inverter's power switch operating frequency, the phase between multi-phase bridge arms, and the phase reversal angle to alter the resonant frequency of the self-heating circuit. The capacitor voltage is then adjusted based on this resonant frequency. This maximizes the battery's self-heating power while maintaining motor torque, improving battery pack performance. Furthermore, the capacitor voltage oscillates according to a preset audio amplitude and frequency, producing pleasant sounds that mask noise. Adjusting the phase between bridge arms also modulates the ripple of the battery's charging and discharging current, thus regulating the heating and heat generation of the battery cells.

[0093] While changing the phase between the inverter's bridge arms, the equivalent inductance of the resonant circuit also changes. The resonant frequency between the battery, electronic control unit, motor, and capacitor also changes. The voltage across the capacitor can be adjusted according to the resonant frequency of the resonant circuit, thereby altering the sound produced by the self-heating circuit and maximizing the self-heating frequency. When the voltage across the capacitor oscillates at a preset audio frequency, it can produce pleasant music while changing the self-heating power of the battery's self-heating circuit, masking noise.

[0094] It should be noted that the battery self-heating circuit of this invention can have various circuit topology connections, such as... Figures 4 to 21 As shown below. (Combined with...) Figures 4 to 21 The various circuit topology connection forms of the battery self-heating circuit in the embodiments of the present invention will be described in detail.

[0095] Reference Figure 4 The diagram illustrates another battery self-heating circuit according to an embodiment of the present invention. The first switch can be switch K5, and the second switch can be switch K1. During battery self-heating, switches K5 and K1 are engaged, while switches K0, K2, K3, K4, and K6 are disengaged. The positive lead of battery pack E1 is connected to the neutral line N of motor 11 via switch K5. When the battery pack discharges, current flows from the positive terminal of the battery pack, passing sequentially through switch K5, the motor, the upper half-bridge arm of the inverter, capacitor C1, and switch K1, before returning to the negative terminal of the battery pack. When the battery pack is charging, the current flows in the opposite direction to the battery pack discharge.

[0096] Reference Figure 5 The diagram illustrates another battery self-heating circuit according to an embodiment of the present invention. The first switch can be switch K5, and the second switch can be switch K2. During battery self-heating, switches K2, K4, and K5 are engaged, while switches K0, K1, K3, and K6 are disengaged. The negative lead of battery pack E1 is connected to the neutral line N of motor 11 via switch K5. When the battery pack discharges, current flows from the positive terminal of the battery pack, passing sequentially through switch K2, capacitor C1, the lower half-bridge arm of the inverter, the motor, switch K4, and switch K5, before returning to the negative terminal of the battery pack. When the battery pack is charging, the current flow direction is opposite to that during battery pack discharge.

[0097] Reference Figure 6 The diagram illustrates another battery self-heating circuit according to an embodiment of the present invention. The first switch can be switch K5, and the second switch can be switch K1. During battery self-heating, switches K5 and K1 are engaged, while switches K2, K3, and K4 are disengaged. The positive lead of battery pack E1 is connected to the neutral line N of motor 11 via switch K5. When the battery pack discharges, current flows from the positive terminal of the battery pack, passing sequentially through switch K5, the motor, the upper half-bridge arm of the inverter, capacitor C1, and switch K1, before returning to the negative terminal of the battery pack. When the battery pack is charging, the current flow direction is opposite to that during battery pack discharge.

[0098] Reference Figure 7 The diagram shows a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. (Refer to...) Figure 8The diagram illustrates another battery self-heating circuit according to an embodiment of the present invention. The first switch can be switch K5, and the second switch can be switch K1. When the second switch is open, capacitor C1 is not connected to the circuit. During the battery self-heating process, switches K5 and K2 are engaged, while switches K0, K1, K3, and K4 are disengaged. Figure 7 As shown in the diagram, when the battery pack discharges, the current flowing from the positive terminal of battery pack E1 can pass through switch K2, from the upper half-bridge arm of inverter 12, through motor 11 and switch K5, and then flow into the negative terminal of battery pack E1. Figure 8 As shown, when the battery pack is charging, the current flows in the opposite direction to the battery pack discharge.

[0099] Reference Figure 9 The diagram shows a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. (Refer to...) Figure 10 The diagram illustrates another battery self-heating circuit according to an embodiment of the present invention. The first switch can be switch K5, and the second switch can be switch K2. During battery self-heating, switches K2 and K4 are engaged, while switches K0, K1, K3, and K4 are disengaged. The negative terminal lead of battery pack E1 is connected to the neutral line N of motor 11 via switch K5. Figure 9 As shown, when the battery pack discharges, the current flows from the positive terminal of the battery pack, passes sequentially through switch K2, capacitor C1, the lower half-bridge arm of the inverter, the motor, and switch K5, before returning to the negative terminal of the battery pack; when the battery pack is charging, the current flows in the opposite direction to the battery pack discharge. Figure 10 As shown, when the battery pack is charging, the current flows in the opposite direction to the battery pack discharge.

[0100] Reference Figure 11 The diagram shows a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. (Refer to...) Figure 12 The diagram illustrates another battery self-heating circuit according to an embodiment of the present invention. The first switch can be switch K5, and the second switch can be switch K2. When the second switch is open, capacitor C1 is not connected to the circuit. During battery self-heating, switches K5 and K1 are engaged, while switches K0, K2, K3, and K4 are disengaged. The positive lead of battery pack E1 is connected to the neutral line N of motor 11 via switch K5. Figure 11 As shown, when the battery pack discharges, the current flows from the positive terminal of the battery pack, passes sequentially through switch K5, the motor, the lower half-bridge arm of the inverter, and switch K1, before returning to the negative terminal of the battery pack. Figure 12 As shown, when the battery pack is charging, the current flows in the opposite direction to the battery pack discharge.

[0101] Reference Figure 13 The diagram shows a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. (Refer to...) Figure 14The diagram illustrates another battery self-heating circuit according to an embodiment of the present invention. The first switch can be switch K5, and the second switch can be switch K1. During battery self-heating, switches K5 and K1 are engaged, while switches K0, K2, K3, and K4 are disengaged, and capacitor C1 is connected to the circuit. The positive lead of battery pack E1 is connected to the neutral line N of motor 11 via switch K5. Figure 13 As shown, when the battery pack discharges, the current flows out from the positive terminal of the battery pack, passes sequentially through switch K5, the motor, the upper half of the inverter bridge, capacitor C1, and switch K1, before returning to the negative terminal of the battery pack. Figure 14 As shown, when the battery pack is charging, the current flows in the opposite direction to the battery pack discharge.

[0102] Reference Figure 15 The diagram shows a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. (Refer to...) Figure 16 The diagram illustrates another battery self-heating circuit according to an embodiment of the present invention. The first switch can be switch K2. When current flows through the lower half-bridge arm of inverter 12, capacitor C1 is not connected to the circuit. During battery self-heating, switches K1 and K2 are engaged, and switch K0 is disengaged. The positive lead of battery pack E1 is connected to the neutral line N of motor 11 via switch K2. Figure 15 As shown, when the battery pack discharges, the current flowing from the positive terminal of battery pack E1 passes sequentially through motor 11, the lower half-bridge arm of inverter 12, and switch K1 before flowing into the negative terminal of battery pack E1. Figure 16 As shown, when the battery pack is charging, the current flows in the opposite direction to the battery pack discharge.

[0103] Reference Figure 17 The diagram shows a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. (Refer to...) Figure 18 The diagram illustrates another battery self-heating circuit according to an embodiment of the present invention. The first switch can be switch K2. When current flows through the upper half-bridge arm of inverter 12, capacitor C1 is connected to the circuit. During battery self-heating, switches K1 and K2 are engaged, and switch K0 is disengaged. The positive lead of battery pack E1 is connected to the neutral line N of motor 11 via switch K2. Figure 17 As shown, when the battery pack discharges, the current flowing from the positive terminal of battery pack E1 passes sequentially through motor 11, the upper half-bridge arm of inverter 12, bus capacitor C1, and switch K1 before flowing into the negative terminal of battery pack E1. Figure 18 As shown, when the battery pack is charging, the current flows in the opposite direction to the battery pack discharge.

[0104] Reference Figure 19This diagram illustrates a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. The first switch can be switch K2. When current flows through the upper half-bridge arm of inverter 12, capacitor C1 is connected to the circuit; when current flows through the lower half-bridge arm of inverter 12, capacitor C1 is not connected to the circuit. The circuit components may include: battery pack E1, a six-phase motor, a six-phase inverter, bus capacitor C1, resistor R, and switches K0, K1, and K2. During battery self-heating, switches K1 and K2 are engaged, and switch K0 is disengaged. The positive lead of battery pack E1 is connected to the neutral line N of the six-phase motor via switch K2. During charging and discharging of the battery pack, the current flow direction is... Figure 15-18 same.

[0105] Reference Figure 20 This diagram illustrates a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. The first switch can be switch K2. When current flows through the upper half-bridge arm of inverter 12, capacitor C1 is connected to the circuit; when current flows through the lower half-bridge arm of inverter 12, capacitor C1 is not connected to the circuit. During battery self-heating, switches K1 and K2 are engaged, and switch K0 is disengaged. The positive lead of battery pack E1 is connected to the neutral line N of motor 11 via switch K2. During charging and discharging of the battery pack, the current flow direction is... Figure 15-18 same.

[0106] Reference Figure 21 The diagram illustrates another battery self-heating circuit according to an embodiment of the present invention. The first switch can be switch K2, and capacitor C1 is not connected to the circuit. During battery self-heating, switches K1 and K2 are engaged, and switch K0 is disengaged. The positive lead of battery pack E1 is connected to the neutral line N of motor 11 via switch K2. When the battery pack discharges, current flows from the positive terminal of the battery pack, sequentially through switch K2, the motor, the lower half-bridge arm of the inverter, and switch K1, before returning to the negative terminal of the battery pack; when the battery pack is charging, the current flow direction is opposite to that of the battery pack discharge.

[0107] This invention allows the capacitor to participate in the charging and discharging process of the battery pack by controlling the voltage of the capacitor to oscillate according to a preset audio amplitude and frequency. During charging and discharging, the battery pack does not have a parallel capacitor, resulting in a significant increase in the current flowing into and out of the battery pack. This, in turn, accelerates the heating rate of the battery pack. The charging and discharging process causes the internal resistance of the battery pack to heat up, thus improving the heating efficiency of the battery pack.

[0108] This invention also provides a battery self-heating circuit control method, applied to the aforementioned battery self-heating circuit, the method comprising:

[0109] The voltage across the capacitor is controlled to vary, and the voltage across the capacitor is configured to vary based on the resonant frequency of the resonant circuit.

[0110] In this embodiment of the invention, the method further includes:

[0111] The resonant frequency of the resonant circuit is determined based on the phase misalignment angle of the multiphase bridge arm of the inverter.

[0112] In this embodiment of the invention, the method further includes:

[0113] The phase shift angle of the multiphase bridge arm of the inverter is controlled according to the frequency of the preset audio.

[0114] In this embodiment of the invention, controlling the voltage across the capacitor to change includes:

[0115] The voltage across the capacitor is controlled according to the preset audio amplitude.

[0116] In this embodiment of the invention, the voltage across the capacitor is controlled by adjusting the duty cycle of the modulation signal corresponding to the inverter.

[0117] In this embodiment of the invention, the operating mode of the battery self-heating circuit includes a first mode, wherein the voltage across the capacitor is configured to vary based on the resonant frequency of the resonant circuit in the first mode.

[0118] In this embodiment of the invention, when the self-heating power of the battery self-heating circuit is less than a preset power threshold, the battery self-heating circuit is in the first mode.

[0119] In this embodiment of the invention, the battery pack, the capacitor, the inverter, and the motor are connected in series to form a self-heating circuit, so that the capacitor participates in the charging or discharging process of the battery pack.

[0120] In this embodiment of the invention, one end of the battery pack is connected to one end of the capacitor, the other end of the capacitor is connected to the inverter, the midpoint of each phase arm of the inverter is connected to the multiphase motor coil of the motor, the multiphase motor coil is connected to the neutral point of the motor, and the neutral point of the motor is connected to the other end of the battery pack.

[0121] In this embodiment of the invention, a first switch is connected between the neutral point of the motor and the battery pack, and a second switch is connected between the capacitor and the battery pack;

[0122] The battery self-heating circuit has a first operating mode, in which the first switch and the second switch are configured to be turned on in the first mode.

[0123] This invention can change the resonant frequency of the resonant circuit by adjusting the phase between the multi-phase bridge arms and the phase reversal angle, and adjust the voltage and frequency of the capacitor according to the resonant frequency. This maximizes the battery self-heating power while ensuring the motor torque, thus improving the performance of the battery pack. At the same time, the voltage of the capacitor changes according to the amplitude and frequency of a preset audio value, which can produce pleasant music and mask noise.

[0124] As the method embodiments are basically similar to the system embodiments, the description is relatively simple, and relevant parts can be found in the description of the system embodiments.

[0125] It should be noted that, for the sake of simplicity, the method embodiments are all described as a series of actions. However, those skilled in the art should understand that the embodiments of the present invention are not limited to the described order of actions, because according to the embodiments of the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily essential to the embodiments of the present invention.

[0126] This invention also provides an electronic device, including a processor connected to a memory storing a computer program, the processor executing the computer program to implement the above-described battery self-heating control method.

[0127] This invention also provides a battery self-heating system, including the battery self-heating circuit described above. The battery self-heating system further includes a battery pack, which is connected to the battery self-heating circuit.

[0128] The present invention also provides a vehicle that includes the above-described battery self-heating circuit, or the above-described electronic device, or the above-described battery self-heating system.

[0129] This invention also provides a computer-readable storage medium including a computer program that, when run on a computer, causes the computer to perform the above-described battery self-heating control method.

[0130] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0131] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, apparatus, or computer program products. Therefore, embodiments of the present invention can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of the present invention can take the form of computer program products embodied on one or more machine-readable media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0132] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0133] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0134] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0135] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0136] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0137] The present invention provides a detailed description of a battery self-heating circuit, control method, device, system, vehicle, and medium. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A battery self-heating circuit, characterized in that, include: Motor, inverter, and capacitor; The inverter, the motor, and the capacitor form a resonant circuit, and the capacitor is also used to connect the battery pack. The voltage across the capacitor is configured to vary based on the resonant frequency of the resonant circuit.

2. The battery self-heating circuit according to claim 1, characterized in that, The inverter includes multi-phase bridge arms, and the resonant frequency of the resonant circuit varies based on the phase shift angle of the multi-phase bridge arms.

3. The battery self-heating circuit according to claim 2, characterized in that, The phase shift angle of the multiphase bridge arm varies based on the frequency of a preset audio signal.

4. The battery self-heating circuit according to claim 1, characterized in that, The voltage across the capacitor is configured to vary based on the amplitude of a preset audio signal.

5. The battery self-heating circuit according to claim 1, characterized in that, The voltage across the capacitor is controlled by adjusting the duty cycle of the modulation signal corresponding to the inverter.

6. The battery self-heating circuit according to claim 2, characterized in that, The battery self-heating circuit has a first operating mode, in which the voltage across the capacitor is configured to vary based on the resonant frequency of the resonant circuit in the first mode.

7. The battery self-heating circuit according to claim 6, characterized in that, When the self-heating power of the battery self-heating circuit is less than a preset power threshold, the battery self-heating circuit is in the first mode.

8. The battery self-heating circuit according to claim 2, characterized in that, The battery pack, the capacitor, the inverter, and the motor are connected in series to form a self-heating circuit, so that the capacitor participates in the charging or discharging process of the battery pack.

9. The battery self-heating circuit according to claim 8, characterized in that, One end of the battery pack is connected to one end of the capacitor, and the other end of the capacitor is connected to the inverter. The midpoint of each phase arm of the inverter is connected to the multi-phase motor coil of the motor. The multi-phase motor coil is connected to the neutral point of the motor. The neutral point of the motor is connected to the other end of the battery pack.

10. The battery self-heating circuit according to claim 9, characterized in that, A first switch is connected between the neutral point of the motor and the battery pack, and a second switch is connected between the capacitor and the battery pack; The battery self-heating circuit has a first operating mode, in which the first switch and the second switch are configured to be turned on in the first mode.

11. The battery self-heating circuit according to any one of claims 1-10, characterized in that, It also includes a control module; The control module is used to control the voltage across the capacitor to change according to the resonant frequency of the resonant circuit.

12. A method for controlling a battery self-heating circuit, characterized in that, Applied to the battery self-heating circuit as described in any one of claims 1-11, the method comprises: The voltage across the capacitor is controlled to vary, and the voltage across the capacitor is configured to vary based on the resonant frequency of the resonant circuit.

13. The method according to claim 12, characterized in that, The method further includes: The resonant frequency of the resonant circuit is determined based on the phase misalignment angle of the multiphase bridge arm of the inverter.

14. The method according to claim 13, characterized in that, The method further includes: The phase shift angle of the multiphase bridge arm of the inverter is controlled according to the frequency of the preset audio.

15. The method according to claim 12, characterized in that, The control of the voltage across the capacitor includes: The voltage across the capacitor is controlled according to the preset audio amplitude.

16. The method according to claim 12, characterized in that, The voltage across the capacitor is controlled by adjusting the duty cycle of the modulation signal corresponding to the inverter.

17. The method according to claim 13, characterized in that, The battery self-heating circuit has a first operating mode, in which the voltage across the capacitor is configured to vary based on the resonant frequency of the resonant circuit in the first mode.

18. The method according to claim 17, characterized in that, When the self-heating power of the battery self-heating circuit is less than a preset power threshold, the battery self-heating circuit is in the first mode.

19. The method according to claim 13, characterized in that, The battery pack, the capacitor, the inverter, and the motor are connected in series to form a self-heating circuit, so that the capacitor participates in the charging or discharging process of the battery pack.

20. The method according to claim 19, characterized in that, One end of the battery pack is connected to one end of the capacitor, and the other end of the capacitor is connected to the inverter. The midpoint of each phase arm of the inverter is connected to the multi-phase motor coil of the motor. The multi-phase motor coil is connected to the neutral point of the motor. The neutral point of the motor is connected to the other end of the battery pack.

21. The method according to claim 20, characterized in that, A first switch is connected between the neutral point of the motor and the battery pack, and a second switch is connected between the capacitor and the battery pack; The battery self-heating circuit has a first operating mode, in which the first switch and the second switch are configured to be turned on in the first mode.

22. An electronic device, characterized in that, The device includes a processor connected to a memory storing a computer program, the processor executing the computer program to implement the battery self-heating control method according to any one of claims 12-21.

23. A battery self-heating system, characterized in that, The battery self-heating system includes the battery self-heating circuit according to any one of claims 1-11, and further includes a battery pack connected to the battery self-heating circuit.

24. A vehicle, characterized in that, It includes the battery self-heating circuit according to any one of claims 1-11, or the electronic device according to claim 22, or the battery self-heating system according to claim 23.

25. A computer-readable storage medium, characterized in that, Includes a computer program that, when run on a computer, causes the computer to perform the battery self-heating control method according to any one of claims 12-21.

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