TWI465001B - Battery heating circuit - Google Patents

Description

Battery heating circuit

The invention belongs to the technical field of electronic devices, and in particular relates to a heating circuit of a battery.

Considering that cars need to travel under complex road conditions and environmental conditions, or that some electronic devices need to be used in poor environmental conditions, batteries that are power sources for electric vehicles or electronic devices need to adapt to these complex conditions. In addition to the need to consider these conditions, you also need to consider the battery life and battery charge and discharge loop performance, especially when the electric vehicle or electronic equipment is in a low temperature environment, it is more desirable that the battery has excellent low temperature charge and discharge performance and higher Input and output power performance.

In general, if the battery is charged under low temperature conditions, the impedance of the battery will increase, the polarization will increase, and the capacity of the battery will decrease, eventually resulting in a decrease in battery life.

SUMMARY OF THE INVENTION The object of the present invention is to provide a heating circuit for a battery in which the battery causes an increase in impedance of the battery under high temperature conditions and polarization is increased, thereby causing a decrease in the capacity of the battery. In order to maintain the capacity of the battery under low temperature conditions and improve the charge and discharge performance of the battery, the present invention provides a heating circuit for a battery.

The heating circuit of the battery provided by the present invention comprises a switching device, a switch control module, a damping element R1, a storage circuit and an energy limiting circuit, wherein the energy storage circuit is connected to the battery, and the energy storage circuit comprises a first Current memory element L1 and first charge memory element C1, damping element R1, switching device, first current memory element L1 and first charge memory element C1 is connected in series, and the switch control module is connected to the switch device, wherein the switch control module is configured to control the switch device to be turned on and off, so that when the switch device is turned on, energy is between the battery and the energy storage circuit Reciprocatingly flowing, the energy limiting circuit is used to limit the amount of current flowing from the tank circuit to the battery.

The heating circuit provided by the invention can improve the charge and discharge performance of the battery, and since the storage circuit is connected in series with the battery in the heating circuit, when the battery is heated, the switch can be avoided due to the presence of the first charge storage element C1 connected in series. The safety problem caused by excessive current when the device is short-circuited can effectively protect the battery.

Other features and advantages of the invention will be described in detail in the detailed description which follows.

1‧‧‧Switching device, foot

2‧‧‧First DC-DC module, foot

3‧‧‧Second DC-DC module, foot

4‧‧‧ Third DC-DC module, foot

5‧‧‧ feet

20‧‧‧ Freewheeling circuit

100‧‧‧Switch Control Module

101‧‧‧Voltage Control Unit

102‧‧‧Polar reversal unit

103‧‧‧Power recharge unit

a, b, c, d‧‧‧

C1‧‧‧First charge memory element

C2‧‧‧Second charge memory element

D3‧‧‧ fifth unidirectional semiconductor component

D4, D5, D6, D7, D8, D13, D14, D20‧‧‧ unidirectional semiconductor components

D11‧‧‧ first unidirectional semiconductor component

D12‧‧‧Second unidirectional semiconductor component

D15‧‧‧ third unidirectional semiconductor component

D16‧‧‧4th unidirectional semiconductor component

E‧‧‧Battery

K20‧‧‧ switch

I _L2 ‧‧‧Polar reversal loop current

I _main ‧‧‧ main loop current

J1‧‧‧First single pole double throw switch

J2‧‧‧Second single pole double throw switch

K6‧‧‧ first switch

K7‧‧‧second switch

K8‧‧‧ sixth switch

K9‧‧‧ fifth switch

K10‧‧‧ third switch

K11‧‧‧fourth switch

L1‧‧‧First Current Memory Element

L2‧‧‧ third current memory component

L3, L4‧‧‧ current memory components

L11‧‧‧Second current memory element

R1‧‧‧damage element

R5‧‧‧ resistance

N1‧‧‧ first node

N2‧‧‧ second node

Q1, Q2, Q3, Q4, Q5, Q6‧‧‧ bidirectional switch

S1, S2, S3, S4, S5, S6‧‧‧ bidirectional switch

Time period t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11, t12‧‧

T1‧‧‧ first transformer

T2‧‧‧second transformer

T3‧‧‧ third transformer

V _C1 ‧‧‧C1 voltage

T4‧‧‧fourth transformer

The drawings are intended to provide a further understanding of the invention, and are intended to be a In the drawings: Fig. 1 is a schematic view showing a heating circuit of a battery provided by the present invention; Fig. 2 is a schematic view showing an embodiment of a switching device in Fig. 1; and Fig. 3 is a view showing a switching device in Fig. 1. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 is a schematic view showing a preferred embodiment of a heating circuit for a battery provided by the present invention; FIG. 5 is a schematic view showing an embodiment of an energy superimposing unit in FIG. 4; 5 is a schematic diagram of an embodiment of a polarity inversion unit in the figure; FIG. 7 is a schematic diagram of an embodiment of a polarity inversion unit in FIG. 5; and FIG. 8 is a diagram of a polarity inversion unit in FIG. FIG. 9 is a schematic view showing an embodiment of a first DC-DC module in FIG. 8; FIG. 10 is a view showing a preferred embodiment of a heating circuit of a battery provided by the present invention; FIG. 11 is a schematic view showing a preferred embodiment of a heating circuit for a battery provided by the present invention; FIG. 12 is a schematic view showing an embodiment of a power refill unit in FIG. 11; and FIG. 13 is a view in FIG. A schematic diagram of an embodiment of a second DC-DC module; FIG. 14 is a schematic diagram of a preferred embodiment of a heating circuit for a battery provided by the present invention; and FIG. 15 is an energy superposition and transfer unit of FIG. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 16 is a schematic view showing a preferred embodiment of a heating circuit for a battery provided by the present invention; and Fig. 17 is a schematic view showing an embodiment of an energy consuming unit in Fig. 16; A schematic diagram of a preferred embodiment of a heating circuit for a battery provided by the present invention; FIG. 19 is a schematic diagram of a freewheeling circuit in the heating circuit of FIG. 18; and FIG. 20 is an embodiment of a heating circuit for a battery provided by the present invention FIG. 21 is a waveform timing diagram corresponding to the heating circuit of the battery shown in FIG. 20; FIG. 22 is a diagram of a heating circuit of the battery provided by the present invention. FIG. 23 is a waveform timing diagram corresponding to the heating circuit of the battery shown in FIG. 22; and FIG. 24 is another waveform timing diagram corresponding to the heating circuit of the battery shown in FIG. 22; Figure 25 is a schematic view showing an embodiment of a heating circuit for a battery provided by the present invention; Figure 26 is a waveform timing chart corresponding to a heating circuit of the battery shown in Figure 25; and Figure 27 is a waveform diagram shown in Figure 25 The first step when the battery heating circuit reverses the battery charge Equivalent circuit diagram; Fig. 28 is a second equivalent circuit diagram when the heating circuit of the battery shown in Fig. 25 reversely charges the battery; Fig. 29 is another corresponding to the heating circuit of the battery shown in Fig. 25. Waveform timing diagram.

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative and not restrictive.

It should be noted that, unless otherwise specified, the term "switch control module" is used to control the output of a corresponding control command (for example, a pulse waveform having a corresponding duty ratio) according to a set condition or a set time. A controller that is turned on or off correspondingly to a switching device connected thereto, for example, may be a PLC (Programmable Controller) or the like; when referred to hereinafter, the term "switch" refers to an on-off control that can be realized by an electrical signal or according to a The characteristics of the device itself can be controlled by on/off control, etc., and can be a one-way switch, such as a one-way switch composed of a bidirectional switch and a diode in series, or a bidirectional switch, such as a metal oxide semiconductor field. Metal Oxide Semiconductor Field Effect Transistor (MOSFET) or IGBT (Insulated Gate Bipolar Transistor) with reversed-current diodes; etc.; when referred to below, the term "bidirectional switch" Refers to the on/off control through electrical signals or on-off control based on the characteristics of the components themselves. a double-conducting switch, such as a MOSFET or an IGBT with an anti-freewheeling diode; etc.; when referred to hereinafter, a unidirectional semiconductor component refers to a semiconductor component having a unidirectional conduction function, such as a diode or the like; When referred to hereinafter, the term "charge memory element" means any electricity that can be realized A device that stores, such as a capacitor, etc.; when referred to hereinafter, the term "current memory element" refers to any device that can store current, such as an inductor, etc.; when referred to hereinafter, the term "forward" refers to energy from the battery to the reservoir. The direction in which the circuit can flow, the term "reverse" refers to the direction in which energy flows from the tank circuit to the battery; as referred to hereinafter, the term "battery" includes primary batteries (eg, dry batteries, alkaline batteries, etc.) and secondary batteries (eg, Lithium-ion battery, nickel-cadmium battery, nickel-hydrogen battery or lead-acid battery, etc.; when referred to hereinafter, the term "damping element" refers to any device that obstructs the flow of current to achieve energy consumption, such as electrical resistance, etc.; As referred to herein, the term "main circuit" refers to a circuit in which a battery is connected in series with a damping element, a switching device, and an energy storage circuit.

It should also be noted here that, in consideration of the different characteristics of different types of batteries, in the present invention, "battery" may refer to an inductance value that does not include internal parasitic resistance and parasitic inductance, or internal parasitic resistance and parasitic inductance. A smaller ideal battery can also be a battery pack that contains internal parasitic resistance and parasitic inductance. Therefore, those skilled in the art should understand that when the "battery" is an ideal battery that does not contain internal parasitic resistance and parasitic inductance, or the internal parasitic resistance and the parasitic inductance inductance value is small, the damping element R1 refers to A damping element external to the battery, the first current memory element L1 refers to a current memory element external to the battery; when the "battery" is a battery pack containing internal parasitic resistance and parasitic inductance, the damping element R1 can refer to the externally connected damping The component may also refer to a parasitic resistance inside the battery pack. Similarly, the first current memory element L1 may refer to a current memory component external to the battery or a parasitic inductance inside the battery pack.

In the embodiment of the present invention, in order to ensure the service life of the battery, the battery needs to be heated at a low temperature. When the heating condition is reached, the heating circuit is controlled to start working, and the battery is heated, and when the heating condition is stopped, the control is performed. The heating circuit stops working.

In the practical application of the battery, as the environment changes, According to the actual environmental conditions, the battery heating condition and the stop heating condition are set to more precisely control the temperature of the battery, thereby ensuring the charge and discharge performance of the battery.

In order to heat the battery E in a low temperature environment, the present invention provides a heating circuit for the battery E. As shown in FIG. 1, the heating circuit includes a switching device 1, a switch control module 100, a damping element R1, and an energy storage device. a circuit and an energy limiting circuit for connecting to the battery, the energy storage circuit comprising a first current memory element L1 and a first charge memory element C1, a damping element R1, a switching device 1, a first current The memory element L1 is connected in series with the first charge memory element C1, and the switch control module 100 is connected to the switch device 1. The switch control module 100 is used to control the switch device 1 to be turned on and off, so that when the switch device 1 is turned on Energy is reciprocated between the battery and the tank circuit, and the energy limiting circuit is used to limit the amount of current flowing from the tank circuit to the battery.

Considering the different characteristics of different types of batteries E, if the parasitic resistance value and the parasitic inductance self-inductance inside the battery E are large, the damping element R1 may also be a parasitic resistance inside the battery, and the first current memory element L1 It can also be a parasitic inductance inside the battery.

The switching device 1 is connected in series with the energy storage circuit, and can realize the reciprocating flow of energy between the battery E and the energy storage circuit when being turned on. The switching device 1 has various implementation manners, and the implementation manner of the switching device is not limited in the present invention. The switching device can include a first one-way branch for enabling energy flow from the battery to the energy storage circuit and a second one-way branch for enabling energy flow from the energy storage circuit to the battery, the switch control module 100 One or both of the first one-way branch and the second one-way branch are respectively connected to control the turning on and off of the connected branch. The energy limiting circuit may include a second current memory element L11 connected in series in the second one-way branch for limiting the amount of current flowing to the battery E.

As an embodiment of the switching device, as shown in FIG. 2 The switching device 1 includes a first switch K6, a first unidirectional semiconductor component D11, and a second unidirectional semiconductor component D12. The first switch K6 and the first unidirectional semiconductor component D11 are connected in series to form the first single To the branch, the second unidirectional semiconductor component D12 constitutes the second one-way branch, and the switch control module 100 is connected to the first switch K6 for controlling by turning on and off the first switch K6 The first one-way branch is turned on and off. The second current memory element L11 is connected in series with the second unidirectional semiconductor element D12. In the switch device 1 shown in Fig. 2, when the heating is required, the first switch K6 can be turned on, and when the heating is not required, the first switch K6 can be turned off.

The implementation of the switching device 1 as shown in Fig. 2, while realizing the flow of energy back and forth along relatively independent branches, does not enable the shutdown function of reverse flow of energy. The present invention also proposes another embodiment of the switching device 1. As shown in FIG. 3, the switching device 1 may further include a second switch K7 located in the second one-way branch, the second switch K7 and the The two unidirectional semiconductor elements D12 are connected in series, and the switch control module 100 is further connected to the second switch K7 for controlling the turning on and off of the second one-way branch by controlling the turning on and off of the second switch K7. Thus, in the switching device 1 shown in FIG. 3, since the switches are present on both of the one-way branches (ie, the first switch K6 and the second switch K7), the shutdown function is provided with both forward and reverse flow of energy. . The second current memory element L11 is connected in series between the second unidirectional semiconductor element D12 and the second switch K7 to effect a function of limiting the current flowing to the battery E.

According to the technical solution of the present invention, when it is required to heat the battery E, the switch control module 100 controls the switching device 1 to be turned on, the battery E and the energy storage circuit are connected in series to form a loop, and the battery E charges the first charge storage element C1 as a loop. When the current in the current passes through the current peak and the positive direction is zero, the first charge storage element C1 starts to discharge, and the current flows from the first charge storage element C1 back to the battery E, and the forward and reverse currents in the loop flow through the damping element. R1, by heating the damping element R1, can achieve the purpose of heating the battery E. The charging and discharging process is performed in a loop. When the temperature of the battery E rises to the stop heating condition, the switch control module 100 can control the switching device 1 to be turned off, and the heating circuit stops working.

During the above heating process, when current flows from the tank circuit back to the battery E, the energy in the first charge memory element C1 does not completely flow back to the battery E, but some energy remains in the first charge memory element C1. Finally, the voltage of the first charge storage element C1 is finally made close to or equal to the battery voltage, so that the energy flow from the battery E to the first charge storage element C1 cannot be performed, which is disadvantageous for the loop operation of the heating circuit. Therefore, in the preferred embodiment of the present invention, an additional unit that superimposes the energy in the first charge storage element C1 and the energy of the battery E, and transfers the energy in the first charge storage element C1 to other energy storage elements is added. . When a certain time is reached, the switching device 1 is turned off, and the energy in the first charge storage element C1 is superimposed, transferred, and the like. The switching device 1 can be turned off at any time point in one cycle or a plurality of cycles; the turn-off time of the switching device 1 can be any time, for example, when the current in the loop is forward/reverse, zero time/not Shutdown can be implemented at zero hour. According to the required shutdown strategy, different implementation forms of the switching device 1 can be selected. If it is only necessary to turn off the forward current flow, the implementation form of the switching device 1 shown in FIG. 2 can be selected, if necessary. When both forward current and reverse current can be turned off, it is necessary to select two unidirectional branches as shown in Figure 3 to control the switching device. Preferably, the switch control module 100 is configured to turn off the switch device 1 when the current flowing through the switch device 1 is zero after the switch device 1 is turned on or zero, so that the loop efficiency is high, and the current in the loop is zero. Turning off the switching device 1 has less effect on the entire circuit.

In order to improve the working efficiency of the heating circuit, according to a preferred embodiment of the present invention, as shown in FIG. 4, the heating circuit provided by the present invention may include an energy superimposing unit, and the energy storage unit The circuit connection is used to superimpose the energy in the energy storage circuit and the energy in the battery E after the switching device 1 is turned on and off. The energy superimposing unit increases the discharge current in the heating circuit when the switching device 1 is turned on again, thereby improving the operating efficiency of the heating circuit.

According to an embodiment of the present invention, as shown in FIG. 5, the energy superimposing unit includes a polarity inversion unit 102 connected to the energy storage circuit for turning on and off the switching device 1 After the disconnection, the polarity of the voltage of the first charge storage element C1 is reversed, and the polarity of the voltage of the first charge storage element C1 after polarity inversion is in series with the voltage of the battery E, when the switching device 1 is turned on again. The energy in the first charge memory element C1 can be superimposed with the energy in the battery E.

As an embodiment of the polarity inversion unit 102, as shown in FIG. 6, the polarity inversion unit 102 includes a first single pole double throw switch J1 and a second single pole double throw switch J2, the first single pole double throw switch J1 and a second single pole double throw switch J2 are respectively located at two ends of the first charge memory element C1, and an incoming line of the first single pole double throw switch J1 is connected in the energy storage circuit, the first single pole double throw switch a first output line of the first charge memory element C1 is connected to the first electrode of the first charge memory device C1, and a second output line of the first single-pole double-throw switch J1 is connected to the second electrode of the first charge memory element C1. The input line of the second single-pole double-throw switch J2 is connected to the energy storage circuit, and the first outgoing line of the second single-pole double-throw switch J2 is connected to the second plate of the first charge memory element C1. The second outgoing line of the second single-pole double-throw switch J2 is connected to the first plate of the first charge storage element C1, and the switch control module 100 is further connected to the first single-pole double-throw switch J1 and the second The single pole double throw switch J2 is respectively connected for changing the first single pole double throw switch J1 and The connection relationship between the incoming and outgoing lines of the second single-pole double-throw switch J2 reverses the voltage polarity of the first charge storage element C1.

According to the above embodiment, the first single pole double throw can be performed in advance The connection relationship between the incoming and outgoing lines of the switch J1 and the second single-pole double-throw switch J2 is set such that when the switching device K1 is turned on, the incoming line of the first single-pole double-throw switch J1 is connected to the first outgoing line thereof. The incoming line of the second single-pole double-throw switch J2 is connected to the first outgoing line. When the switching device K1 is turned off, the switch control module 100 controls the incoming line of the first single-pole double-throw switch J1 to switch to the second outgoing line. The incoming line of the second single-pole double-throw switch J2 is switched to be connected to its second outgoing line, thereby achieving the purpose of reversing the polarity of the voltage of the first charge storage element C1.

As another embodiment of the polarity inversion unit 102, as shown in FIG. 7, the polarity inversion unit 102 includes a fifth unidirectional semiconductor element D3, a third current memory element L2, and a fifth switch K9, the A charge storage element C1, a third current memory element L2 and a fifth switch K9 are sequentially connected in series to form a loop, the fifth unidirectional semiconductor element D3 being connected in series with the first charge storage element C1 and the third current memory element L2 or Between the third current memory element L2 and the fifth switch K9, the switch control module 100 is further connected to the fifth switch K9 for memorizing the first charge by controlling the fifth switch K9 to be turned on. The voltage polarity of the element C1 is reversed.

According to the above embodiment, when the switching device 1 is turned off, the fifth switch K9 can be controlled to be turned on by the switch control module 100, whereby the first charge storage element C1 and the fifth unidirectional semiconductor element D3 and the third current memory element are turned on. L2 and the fifth switch K9 form an LC oscillation circuit, and the first charge storage element C1 is discharged through the third current memory element L2. After the current on the oscillation circuit flows through the positive half cycle, the current flowing through the third current memory element L2 is zero. The purpose of reversing the polarity of the voltage of the first charge memory element C1 is achieved.

As still another embodiment of the polarity inversion unit 102, as shown in FIG. 8, the polarity inversion unit 102 includes a first DC-DC module 2 and a second charge memory element C2, the first DC-DC mode. Group 2 is connected to the first charge storage element C1 and the second charge memory element C2, respectively The switch control module 100 is further connected to the first DC-DC module 2 for transferring energy in the first charge storage element C1 to the first DC-DC module 2 by controlling the operation of the first DC-DC module 2 The second charge storage element C2 further reverses the energy in the second charge storage element C2 back to the first charge storage element C1 to achieve a reversal of the voltage polarity of the first charge storage element C1. .

The first DC-DC module 2 is a DC-DC converter circuit commonly used in the art for realizing voltage polarity inversion. The present invention does not impose any limitation on the specific circuit structure of the first DC-DC module 2, as long as It can be realized that the voltage polarity of the first charge memory element C1 is reversed, and those skilled in the art can add, replace or delete the elements in the circuit according to the actual operation.

FIG. 9 is an embodiment of the first DC-DC module 2 provided by the present invention. As shown in FIG. 9, the first DC-DC module 2 includes: a bidirectional switch Q1, a bidirectional switch Q2, and a bidirectional switch. Q3, bidirectional switch Q4, first transformer T1, unidirectional semiconductor component D4, unidirectional semiconductor component D5, current memory component L3, bidirectional switch Q5, bidirectional switch Q6, second transformer T2, unidirectional semiconductor component D6, unidirectional semiconductor Element D7 and unidirectional semiconductor element D8.

In this embodiment, the bidirectional switch Q1, the bidirectional switch Q2, the bidirectional switch Q3, and the bidirectional switch Q4 are MOSFETs, and the bidirectional switch Q5 and the bidirectional switch Q6 are IGBTs.

Wherein, the first leg, the fourth leg and the fifth pin of the first transformer T1 are the same name end, and the second leg and the third pin of the second transformer T2 are the same name end.

The anode of the unidirectional semiconductor device D7 is connected to the a terminal of the capacitor C1, the cathode of the unidirectional semiconductor device D7 is connected to the drain of the bidirectional switch Q1 and the bidirectional switch Q2, and the source of the bidirectional switch Q1 and the drain of the bidirectional switch Q3. Connected, the source of bidirectional switch Q2 is connected to the drain of bidirectional switch Q4, the source of bidirectional switch Q3, bidirectional switch Q4 and b of capacitor C1 The terminals are connected to form a full bridge circuit. At this time, the voltage polarity of the capacitor C1 is positive at the end a and negative at the b terminal.

In the full-bridge circuit, the bidirectional switch Q1, the bidirectional switch Q2 is an upper bridge arm, the bidirectional switch Q3, and the bidirectional switch Q4 are lower bridge arms, and the full bridge circuit is connected to the second charge storage element C2 through the first transformer T1. 1 leg of the first transformer T1 is connected to the first node N1, 2 legs are connected to the second node N2, and pins 3 and 5 are respectively connected to the anode of the unidirectional semiconductor element D4 and the unidirectional semiconductor element D5; the unidirectional semiconductor element D4 and the cathode of the unidirectional semiconductor element D5 are connected to one end of the current memory element L3, and the other end of the current memory element L3 is connected to the d terminal of the second charge memory element C2; the pin 4 of the transformer T1 and the second charge memory element C2 The c-terminal connection, the anode of the unidirectional semiconductor element D8 is connected to the d terminal of the second charge memory element C2, and the cathode of the unidirectional semiconductor element D8 is connected to the b terminal of the first charge memory element C1, at this time, the second charge memory element C2 The voltage polarity is negative at the c-end and positive at the d-end.

The c-terminal of the second charge storage element C2 is connected to the emitter of the bidirectional switch Q5, the collector of the bidirectional switch Q5 is connected to the 2 pin of the transformer T2, and the 1 leg of the transformer T2 is connected to the a end of the first charge storage element C1. The 4 pin of the transformer T2 is connected to the a terminal of the first charge memory element C1, the 3 pin of the transformer T2 is connected to the anode of the unidirectional semiconductor component D6, the cathode of the unidirectional semiconductor component D6 is connected to the collector of the bidirectional switch Q6, and the bidirectional switch Q6 The emitter is connected to the b terminal of the second charge memory element C2.

The bidirectional switch Q1, the bidirectional switch Q2, the bidirectional switch Q3, the bidirectional switch Q4, the bidirectional switch Q5, and the bidirectional switch Q6 are respectively turned on and off by the control of the switch control module 100.

The working process of the first DC-DC module 2 is described below:

1. After the switch device 1 is turned off, the switch control module 100 controls the bidirectional switch Q5, the bidirectional switch Q6 is turned off, the bidirectional switch Q1 is controlled, and the bidirectional switch is turned on. The Q4 is turned on at the same time to form the A phase, the bidirectional switch Q2 is controlled, and the bidirectional switch Q3 is simultaneously turned on to form the B phase, and the A phase and the B phase are alternately turned on to form a full bridge circuit to operate; 2. When the full bridge is When the circuit is in operation, the energy on the first charge memory element C1 is transferred to the second charge memory element C2 through the first transformer T1, the unidirectional semiconductor element D4, the unidirectional semiconductor element D5, and the current memory element L3. The voltage polarity of the charge memory element C2 is negative at the c-terminus and positive at the d-end.

3. The switch control module 100 controls the bidirectional switch Q5 to be turned on, and the first charge storage element C1 forms a path through the second transformer T2 and the unidirectional semiconductor element D8 and the second charge storage element C2, thereby, the second charge storage element The energy on C2 is reversely transferred to the first charge storage element C1, wherein part of the energy is stored on the second transformer T2; at this time, the switch control module 100 controls the bidirectional switch Q5 to be turned off and the bidirectional switch Q6 to be closed. Transferring the energy stored on the second transformer T2 to the first charge storage element C1 through the second transformer T2 and the unidirectional semiconductor element D6 to achieve reverse charging of the first charge storage element C1, at which time the first charge memory The polarity of the voltage of the element C1 is reversed such that the a terminal is negative and the b terminal is positive, thereby achieving the purpose of reversing the polarity of the voltage of the first first charge storage element C1.

In order to recycle energy in the energy storage circuit, in accordance with a preferred embodiment of the present invention, as shown in FIG. 10, the heating circuit provided by the present invention may include an energy transfer unit, the energy transfer unit and the energy storage The circuit is connected to transfer energy in the energy storage circuit to the energy storage element after the switching device 1 is turned on and then turned off. The energy transfer unit is intended to recycle energy in the storage circuit. The energy storage component can be an external capacitor, a low temperature battery or a power grid, and other electrical devices.

Preferably, the energy storage component is a battery E provided by the present invention, and the energy transfer unit includes a power recharge unit 103, and the power recharge unit 103 is connected to the energy storage circuit for being turned on at the switch device 1. After turning off again, the energy in the tank circuit is transferred to the battery E as shown in FIG.

According to the technical solution of the present invention, after the switching device 1 is turned off, the energy in the energy storage circuit is transferred to the battery E through the energy transfer unit, and the transferred energy can be recycled after the switching device 1 is turned on again. Improve the working efficiency of the heating circuit.

As an embodiment of the power recharging unit 103, as shown in FIG. 12, the power recharging unit 103 includes a second DC-DC module 3, the second DC-DC module 3 and the first electric charge. The memory component C1 and the battery E are respectively connected, and the switch control module 100 is further connected to the second DC-DC module 3 for controlling the second DC-DC module 3 to operate the first charge. The energy in the memory element C1 is transferred to the battery.

The second DC-DC module 3 is a DC-DC converter circuit commonly used in the art for implementing energy transfer. The present invention does not impose any limitation on the specific circuit structure of the second DC-DC module 3, as long as it can be implemented. The energy of the first charge storage element C1 can be transferred, and those skilled in the art can add, replace or delete the components in the circuit according to the actual operation.

FIG. 13 is an embodiment of the second DC-DC module 3 provided by the present invention. As shown in FIG. 13, the second DC-DC module 3 includes: a bidirectional switch S1, a bidirectional switch S2, and a bidirectional switch. S3, a bidirectional switch S4, a third transformer T3, a current memory element L4, and four unidirectional semiconductor elements. In this embodiment, the bidirectional switch S1, the bidirectional switch S2, the bidirectional switch S3, and the bidirectional switch S4 are all MOSFETs.

Wherein the 1st pin and the 3rd leg of the third transformer T3 are the same name end, and the negative electrodes of the two unidirectional semiconductor elements of the four unidirectional semiconductor elements are connected in groups, and the contacts pass through the current memory element L4 and the battery E The positive terminal is connected, the other two unidirectional semiconductor components are connected in a positive group, the contacts are connected to the negative terminal of the battery E, and the connection points between the groups and the third transformer are respectively The 3rd and 4th pins of T3 are connected, thereby forming a bridge rectifier circuit.

The source of the bidirectional switch S1 is connected to the drain of the bidirectional switch S3, the source of the bidirectional switch S2 is connected to the drain of the bidirectional switch S4, the drain of the bidirectional switch S1, the bidirectional switch S2 and the first charge storage element C1. The positive terminal is connected, and the source of the bidirectional switch S3 and the bidirectional switch S4 is connected to the negative terminal of the first charge storage element C1, thereby constituting a full bridge circuit.

In the full bridge circuit, the bidirectional switch S1, the bidirectional switch S2 is the upper arm, the bidirectional switch S3, the bidirectional switch S4 is the lower arm, the node of the third transformer T3 and the node between the bidirectional switch S1 and the bidirectional switch S3 Connection, 2 pin and node connection between bidirectional switch S2 and bidirectional switch S4.

The bidirectional switch S1, the bidirectional switch S2, the bidirectional switch S3, and the bidirectional switch S4 are respectively turned on and off by the control of the switch control module 100.

The following describes the working process of the second DC-DC module 3: 1. After the switching device 1 is turned off, the switch control module 100 controls the bidirectional switch S1 and the bidirectional switch S4 to be simultaneously turned on to form the A phase. Controlling the bidirectional switch S2 and the bidirectional switch S3 to be simultaneously turned on to form the B phase, and controlling the A phase and the B phase to alternately conduct to form a full bridge circuit for operation; 2. When the full bridge circuit operates, the first charge memory The energy on the component C1 is transferred to the battery E through the third transformer T3 and the rectifying circuit, and the rectifying circuit converts the input alternating current into a direct current output to the battery E for the purpose of recharging the electric quantity.

In order to enable the heating circuit provided by the present invention to recover energy in the energy storage circuit while improving work efficiency, according to a preferred embodiment of the present invention, as shown in FIG. 14, the heating circuit provided by the present invention may include An energy superposition and transfer unit connected to the energy storage circuit for transferring energy in the energy storage circuit to the energy storage element after the switching device 1 is turned on and off, and then storing The remaining energy in the energy circuit is superimposed on the energy in the battery. The energy superposition and transfer unit can both improve the working efficiency of the heating circuit and recycle the energy in the energy storage circuit.

The superposition of the remaining energy in the tank circuit with the energy in the battery can be achieved by inverting the polarity of the voltage of the first charge memory element C1. The polarity of the voltage of the first charge memory element C1 is reversed and its polarity is matched with the battery. The voltage polarity of E forms a series addition relationship, whereby the energy in the battery E can be superimposed with the energy in the first charge memory element C1 when the switching device 1 is turned on next time.

Therefore, according to an embodiment, as shown in FIG. 15, the energy superimposing and transferring unit includes a third DC-DC module 4, and the third DC-DC module 4 and the first charge storage element C1 and The battery control module 100 is further connected to the third DC-DC module 4 for controlling the third DC-DC module 4 to operate the first charge memory component C1. The energy in the energy transfer is transferred to the energy storage element, and then the remaining energy in the first charge memory element C1 is superimposed with the energy in the battery.

The third DC-DC module 4 is a DC-DC converter circuit commonly used in the art for implementing energy transfer and voltage polarity inversion. The present invention does not make any specific circuit structure of the third DC-DC module 4. The limitation is that as long as the energy transfer and voltage polarity inversion of the first charge storage element C1 can be realized, those skilled in the art can add, replace or delete the components in the circuit according to the actual operation.

As an embodiment of the third DC-DC module 4, as shown in FIG. 15, the third DC-DC module 4 includes: a bidirectional switch S1, a bidirectional switch S2, a bidirectional switch S3, a bidirectional switch S4, and a bidirectional switch. S5, a bidirectional switch S6, a fourth transformer T4, a unidirectional semiconductor element D13, a unidirectional semiconductor element D14, a current memory element L4, and four unidirectional semiconductor elements. In this embodiment, the bidirectional switch S1 and the bidirectional switch S2 The bidirectional switch S3 and the bidirectional switch S4 are MOSFETs, and the bidirectional switch S5 and the bidirectional switch S6 are IGBTs.

Wherein, the 1st pin and the 3rd pin of the fourth transformer T4 are the same name end, and the negative electrodes of the two unidirectional semiconductor elements of the four unidirectional semiconductor elements are connected in groups, and the contacts pass through the current memory element L4 and the positive of the battery E The terminals are connected, the other two unidirectional semiconductor components are connected in a positive group, the contacts are connected to the negative terminal of the battery E, and the mating points between the groups are respectively passed through the bidirectional switch S5 and the bidirectional switch S6 and the third transformer T3. The 3 pin and the 4 pin are connected, thereby constituting a bridge rectifier circuit.

The source of the bidirectional switch S1 is connected to the drain of the bidirectional switch S3, the source of the bidirectional switch S2 is connected to the drain of the bidirectional switch S4, and the drain of the bidirectional switch S1 and the bidirectional switch S2 is passed through the unidirectional semiconductor component D13 and the The positive terminal of the charge storage element C1 is connected, and the source of the bidirectional switch S3 and the bidirectional switch S4 is connected to the negative terminal of the first charge storage element C1 via the unidirectional semiconductor element D14, thereby constituting a full bridge circuit.

In the full bridge circuit, the bidirectional switch S1, the bidirectional switch S2 is the upper arm, the bidirectional switch S3, the bidirectional switch S4 is the lower arm, the node of the fourth transformer T4 and the node between the bidirectional switch S1 and the bidirectional switch S3 Connection, 2 pin and node connection between bidirectional switch S2 and bidirectional switch S4.

The bidirectional switch S1, the bidirectional switch S2, the bidirectional switch S3, the bidirectional switch S4, the bidirectional switch S5, and the bidirectional switch S6 are respectively turned on and off by the control of the switch control module 100.

The following describes the working process of the third DC-DC module 4: 1. After the switching device 1 is turned off, when it is required to perform power recharging on the first charge storage element C1 to achieve energy transfer, The switch control module 100 controls the bidirectional switches S5 and S6 to be turned on, and controls the bidirectional switch S1 and the bidirectional switch S4 to be simultaneously turned on to form the A phase, the control bidirectional switch S2, and the bidirectional switch S3 are simultaneously turned on to form the B phase, by controlling the phase A, Phase B alternately conducts Working to form a full bridge circuit; 2. When the full bridge circuit is operated, energy on the first charge storage element C1 is transferred to the battery E through the fourth transformer T4 and the rectifier circuit, and the rectifier circuit inputs the alternating current Converting to DC output to battery E, achieving the purpose of power refill; 3. When polarity reversal of the first charge storage element C1 is required to achieve energy superposition, the switch control module 100 controls the bidirectional switch S5 and the bidirectional switch S6 is turned off, and the bidirectional switch S1 and the bidirectional switch S4 or the bidirectional switch S2 and the bidirectional switch S3 are controlled to be turned on; at this time, the energy in the first charge storage element C1 passes through the positive terminal thereof and the bidirectional switch S1. The primary side of the fourth transformer T4, the bidirectional switch S4 is reversed back to its negative end, or is reversed back to its negative end by its positive terminal, the bidirectional switch S2, the primary side of the fourth transformer T4, and the bidirectional switch S3, using T4 The primary side magnetizing inductance achieves the purpose of inverting the polarity of the voltage of the first charge memory element C1.

According to another embodiment, the energy superposition and transfer unit may include an energy superimposing unit and an energy transfer unit, and the energy transfer unit is connected to the energy storage circuit for storing after the switching device 1 is turned on and then turned off. The energy in the energy circuit is transferred to the energy storage element, and the energy superimposing unit is connected to the energy storage circuit for using the remaining energy in the energy storage circuit and the battery in the battery after the energy transfer unit performs energy transfer The energy is superimposed.

Wherein, both the energy superimposing unit and the energy transfer unit can adopt the energy superimposing unit and the energy transfer unit provided by the foregoing embodiment of the present invention, and the purpose thereof is to realize energy transfer and superposition of the first electric charge memory element C1, which is specific Structure and function will not be described here.

As an embodiment of the present invention, in order to operate the heating circuit, the energy in the first charge storage element C1 can also be consumed. Therefore, as shown in FIG. 16, the heating circuit further includes an energy consuming unit connected to the first charge storage element C1, the energy consumption list The element is used to consume energy in the first charge storage element C1 after the switching device 1 is turned on and off.

The energy consuming unit can be used alone in the heating circuit. After the switching device 1 is turned on and then turned off, the energy in the first charge storage element C1 is directly consumed, and can also be combined with the above various embodiments, for example, the energy. The consuming unit may be combined with a heating circuit including an energy superimposing unit to consume energy in the first charge storage element C1 after the switching device 1 is turned on and off, and before the energy superimposing unit performs an energy superimposing operation, and may also include energy transfer. The heating circuit of the unit is combined to consume energy in the first charge memory element C1 after the switching device 1 is turned on and off, before the energy transfer unit performs energy transfer, or after the energy transfer unit performs energy transfer. The heating circuit of the superimposing and transferring unit combines to consume energy in the first charge storage element C1 after the switching device 1 is turned on and off, before the energy superposition and transfer unit performs energy transfer, or in the energy superposition and transfer unit. After the transfer, before the energy superposition, the first charge Recalling the energy consumption element C1 is performed, the present invention is not limited in this, and can more clearly understand the energy consumption during operation of the cell by the following embodiments.

According to an embodiment, as shown in FIG. 17, the energy consumption unit includes a voltage control unit 101 for voltages across the first charge memory element C1 when the switching device 1 is turned on and off again. The value is converted to a voltage set point. This voltage setting value can be set according to the needs of actual operation.

As shown in FIG. 17, the voltage control unit 101 includes a resistor R5 and a sixth switch K8, which are connected in series with each other and then connected in parallel at both ends of the first charge memory element C1. The switch control module 100 is further connected to the sixth switch K8, and the switch control module 100 is further configured to control the sixth switch after the control switch device 1 is turned on and off again. K8 is turned on. Thereby, the energy in the first charge memory element C1 can be consumed by the resistor R5.

Due to the existence of the current memory element, when the current flowing from the energy storage circuit to the battery is turned off, the switching device is turned off, and the sudden change of the current to zero may cause the inductance components such as the first current memory element L1 and the second current memory element L11 to be larger. Induced electromotive force may damage other circuit components in the circuit such as the switching device 1. In view of the above problems, preferably, as shown in FIG. 18, the heating circuit of the battery E provided by the present invention further includes a freewheeling circuit 20, which is capable of being turned off from the storage circuit to the battery E in the presence of the freewheeling circuit 20. After the switching device 1, the freewheeling circuit 20 is operated to protect other circuit components in the circuit. As shown in FIG. 19, the freewheeling circuit 20 may include a switch K20 and a unidirectional semiconductor component D20 connected in series with each other, and the switch control module 100 is connected to the switch K20 for flowing from the energy storage circuit to the battery. After the switching device 1 is turned off at the current, the control switch K20 is turned on, and after the current flowing from the storage circuit to the battery is a predetermined value of the current, the control switch K20 is turned off. One end of the freewheeling circuit 20 may be connected between the first current memory element L1 and the switching device 1, and the other end may be connected to the negative pole of the battery. In the heating circuit provided by the present invention, in addition to the first current memory element L1 in the main circuit, there is a second current memory element L11 for energy limiting on the second one-way branch of the switching device 1, preferably, The freewheeling circuit 20 has one end connected to the negative pole of the battery and the other end connected to the second one-way branch to cause a freewheeling current to flow through the second current memory element L11. For example, in the embodiment employing the switching device 1 as shown in Fig. 2, one end of the freewheeling circuit 20 is connected between the second unidirectional semiconductor element D12 and the second current memory element L11, and the other end is connected to the battery. The negative electrode of E; in the embodiment employing the switching device 1 as shown in Fig. 3, one end of the freewheeling circuit 20 is connected between the second switch K7 and the second current memory element L11, and the other end is connected to the battery The negative pole of E, so as to better play the role of freewheeling.

In order to save components and reduce the volume of the heating circuit, the present invention also provides a preferred embodiment such that the second current memory element L11 for energy limiting can also be used in the polarity inversion unit 102 to The voltage across the first charge memory element C1 acts when the polarity is reversed. In this preferred embodiment, as shown in FIG. 25, the switching device 1 can be in the form of a switching device as shown in FIG. 5, and the second current storage element L11 for energy limiting is connected in series to the switching device 1. Between the second unidirectional semiconductor component D12 and the second switch K7 of the second unidirectional branch; the heating circuit further includes a third unidirectional semiconductor component D15, a fourth unidirectional semiconductor component D16, and a third switch K10, a fourth switch K11; a cathode of the fourth unidirectional semiconductor element D16 is connected between the second switch K7 and the charge memory element L11, a positive stage is connected to one end of the fourth switch K11, and the other end of the fourth switch K11 is connected to the battery a negative stage; a positive side of the third unidirectional semiconductor element D15 is connected between the second unidirectional semiconductor element D12 and the charge memory element L11, a negative stage is connected to one end of the third switch K10, and the other end of the third switch K10 is connected To the negative level of the battery; the switch control module 100 is further connected to the third switch K10 and the fourth switch K11 for controlling the turning on and off of the third switch K10 and the fourth switch K11.

In this preferred embodiment, the switch control module 100 can employ various different turn-off strategies for the control of the first switches K6, K7, K10, and K11 in the heating circuit, as long as energy can be achieved in the battery E and the first The flow between the charge storage elements C1 and the voltage across the first charge storage element C1 can be reversed. For example, in one mode, when it is required to heat the battery, the switch control module 100 controls the first switch K6 and the second switch K7 to be turned on to cause energy to flow from the battery to the first charge storage element C1, and then from the first The charge memory element C1 flows to the battery (wherein the first switch K6 and the second switch K7 can be turned on at the same time, or the second switch K7 can be turned on after the first switch K6 is turned off); when the first charge memory element C1 The voltage value at the terminal reaches the first pre-value that is greater than the battery voltage. When the value is set, the second switch K7 is turned off, and the fourth switch K11 is turned on until the current flowing through the second current memory element L11 is zero, the fourth switch K11 is turned off, and the second switch K7 and the third switch K10 are turned on. The polarity of the voltage across the first charge memory element C1 is reversed. For another example, in another manner, when it is required to heat the battery, the switch control module 100 controls the first switch K6 and the second switch K7 to be turned on to cause energy to flow from the battery to the first charge storage element C1, and then The first charge memory element C1 flows to the battery; when the voltage value across the first charge memory element C1 reaches a second preset value that is less than or equal to the battery voltage, the second switch K7 is turned off, and the fourth switch K11 is turned on, when the current When the current through the second current memory element L11 reaches the second current setting value, the fourth switch K11 is turned off, the second switch K7 and the third switch K10 are turned on, and the current flowing through the second current memory element L11 reaches the first current. When the value is set, the third switch K10 is turned off to cause the energy in the second current memory element L11 to flow to the battery, and when the current flowing through the second current memory element L11 is zero, the second switches K7 and K10 are turned on to make the first charge The voltage polarity across the memory element C1 is reversed.

The switch control module 100 can be a single controller. The on/off control of different external switches can be implemented by setting the internal program. The switch control module 100 can also be multiple controllers. For example, a corresponding switch control module 100 is provided for each external switch. The plurality of switch control modules 100 can also be integrated into one body. The present invention does not limit the implementation form of the switch control module 100.

The operation mode of the embodiment of the heating circuit of the battery E will be briefly described below with reference to FIGS. 20 to 29, wherein FIG. 20, FIG. 22, and FIG. 25 show various embodiments of the heating circuit of the battery E, Fig. 21, Fig. 23 and Fig. 24, and Figs. 26 and 29 show corresponding waveform diagrams. It should be noted that although the features and elements of the present invention are described with reference to FIG. 20, FIG. 22, and FIG. 25 in a specific combination, each feature or element may have no other features or elements. It can be used alone or in various situations with or without other features and elements. The embodiment of the heating circuit of the battery E provided by the present invention is not limited to the implementations shown in Figs. 20, 22, and 25. The grid portion in the waveform diagrams shown in Fig. 21, Fig. 23 and Fig. 24, and Figs. 26 and 29 shows that a drive pulse can be applied to the switch one or more times during the period of time, and the width of the pulse It can be adjusted as needed.

In the heating circuit of the battery E as shown in Fig. 20, the first switch K6 and the first unidirectional semiconductor element D11 are connected in series to constitute a first unidirectional branch of the switching device 1, and the second unidirectional semiconductor element D12 constitutes a switching device. a second one-way branch of the second current storage element L11 is disposed as an energy limiting circuit in the second one-way branch, in series with the second unidirectional semiconductor component D12, the fifth unidirectional semiconductor component D3, the third current The memory element L2 and the fifth switch K9 constitute a polarity inversion unit 102, and the switch control module 100 can control the on and off of the fifth switch K9 and the first switch K6. Fig. 21 is a view showing a main circuit current, a C1 voltage, and a polarity reversal circuit current waveform of the heating circuit shown in Fig. 20. The operation of the heating circuit shown in Fig. 20 is as follows: a) The switch control module 100 Controlling that the first switch K6 is turned on, and the battery E performs forward discharge through the first switch K6, the first unidirectional semiconductor element D11, and the first charge memory element C1 (as shown in the time period t1 in FIG. 21), and passes the The two current memory elements L11 and the second unidirectional semiconductor element D12 are reversely charged (as shown by the time t2 in FIG. 21), and it can be seen from the time t2 of FIG. 21 that the second current memory element L11 exists. When the battery is charged, the main circuit current is limited to be small; b) the switch control module 100 controls the first switch K6 to turn off when the reverse current is zero; c) the switch control module 100 controls the fifth switch K9 Turning on, the polarity inversion unit 102 operates, and the first charge memory element C1 passes through the fifth one-way semiconductor element. The circuit composed of the device D3, the third current memory element L2 and the fifth switch K9 discharges and achieves the purpose of voltage polarity reversal. Thereafter, the switch control module 100 controls the fifth switch K9 to be turned off, as in the t3 in FIG. The time period is shown; d) steps a) to c) are repeated, and the battery E is continuously heated by charge and discharge until the battery E reaches the stop heating condition.

In the heating circuit of the battery E as shown in Fig. 22, the first switch K6 and the first unidirectional semiconductor element D11 are connected in series to constitute a first unidirectional branch of the switching device 1, the second unidirectional semiconductor element D12 and the second The switch K7 constitutes a second one-way branch of the switching device 1, and the second current memory element L11 is connected in series between the second unidirectional semiconductor element D12 and the second switch K7 to function as a current limiting, and the fifth unidirectional semiconductor element D3 The third current memory element L2 and the fifth switch K9 form a polarity inversion unit 102. The unidirectional semiconductor element D20 and the switch K20 are connected in series to form a freewheeling circuit, and one end of the freewheeling circuit is connected to the second current of the second one-way branch. Between the memory element L11 and the second switch K7, the other end of the freewheeling circuit is connected to the negative pole of the battery, and the switch control module 100 can control the conduction of the first switch K6, the second switch K7, the fifth switch K9 and the switch K20. Shut down. Fig. 23 and Fig. 24 are diagrams showing the main circuit current, the C1 voltage and the polarity reversal circuit current waveform of the heating circuit shown in Fig. 22, and the second switch K7 is turned on and off in one cycle in Fig. 23 Breaking, a single freewheeling is performed from the diode D20 when the second switch K7 is turned off, and the second switch K7 is controlled to be turned on and off a plurality of times during the reverse charging of the battery E in one cycle in FIG. When the second switch K7 is turned off multiple times, the current is renewed multiple times from the diode D20. The operation of the heating circuit shown in FIG. 22 is as follows: a) The switch control module 100 controls the first switch K6 to be turned on, and the battery E is performed by the first switch K6, the first unidirectional semiconductor component D11, and the first charge memory component C1. Positive discharge (as shown in the t1 time period in Fig. 23 and Fig. 24), after the positive discharge is completed, the switch control module 100 controls the second switch K7 to be turned on (as shown in Fig. 23) or controls the K7 Secondary conduction and shutdown (eg As shown in Fig. 24, the first charge storage element C1 reversely charges the battery E through the second switch K7, the second current memory element L11 and the second unidirectional semiconductor element D12 (as in the t2 time in Figs. 23, 24) As shown in the paragraph), since the presence of the second current memory element L11 limits the amount of current flowing to the battery E, the switch control module 100 controls the switch K20 to be turned on to maintain the freewheeling of the diode D20 when the K7 is turned off. The action is as shown in the t2 time period of FIG. 23 and FIG. 24; b) the switch control module 100 controls the second switch K7, K20 to be turned off when the reverse current is a current set value (eg, at zero time); c) The switch control module 100 controls the fifth switch K9 to be turned on, the polarity inversion unit 102 operates, and the first charge storage element C1 is discharged through a loop composed of the fifth unidirectional semiconductor element D3, the third current memory element L2, and the fifth switch K9. And achieving the purpose of reversing the polarity of the voltage of the first charge memory element C1, after which the switch control module 100 controls the fifth switch K9 to be turned off, as shown in the t3 time period in FIGS. 23 and 24; d) repeating step a) To c), the battery E is continuously heated by charging and discharging until the battery E reaches the stop Until the heating conditions are met.

In the heating circuit shown in FIG. 25, the first one-way branch of the switching device 1 is formed by the first switch K6 and the first unidirectional semiconductor element D11 in series, and the second unidirectional semiconductor element D12 and the second switch K7 are formed. a second one-way branch of the switching device 1, the second current memory element L11 is connected in series between the second unidirectional semiconductor element D12 and the second switch K7 to function as a current limiting; the fourth switch K11 and the fourth unidirectional semiconductor The branch formed by the component D16 acts as a freewheeling; the second switch K7, the second current memory element L11, the third unidirectional semiconductor component D15 and the third switch K10 and the first charge memory component C1 constitute the first charge memory component C1 The polarity inversion loop, and Fig. 26 is a waveform diagram showing the main circuit current, the C1 voltage, and the polarity inversion loop current of the heating circuit shown in Fig. 25. For ease of understanding, Figures 27 and 28 provide an equivalent circuit diagram for recharging. Combine Figure 26, the following describes a working process of the heating circuit shown in Figure 25:

a) The switch control module 100 controls the first switch K6 to be turned on, and the battery E performs forward discharge (as shown in the t1 period of FIG. 26); b) after the forward discharge is completed, the switch control module 100 controls the first switch K6 is turned off, and the second switch K7 is controlled to be turned on, and the first charge storage element C1 reversely charges the battery E through the second switch K7, the second current memory element L11, and the second unidirectional semiconductor element D12 (as shown in FIG. 26). During the t2 time period), during the reverse charging of the battery E, the second switch K7 can be controlled to be turned on and off a plurality of times to reduce the current flowing to the battery E, as in the t2 time period in FIG. And turning on the fourth switch K11 at the same time during the reverse charging or turning on the fourth switch K11 after turning off the second switch K7 in the presence of the current flowing to the battery, so that the fourth unidirectional semiconductor element D16 is freewheeling effect.

c) when the voltage of the first charge storage element C1 reaches a first preset value (the first preset value is greater than the battery voltage), the switch control module 100 controls the second switch K7 to be turned off, and turns on the fourth switch K11 To the freewheeling action; when the current flowing through the current memory element C1 is zero, the K11 is turned off, and the second switch K7 and the third switch K10 are turned on, the first charge memory element C1 passes through the second switch K7, the second current memory The element L11, the third unidirectional semiconductor element D15 and the third switch K10 are discharged, and the polarity of the first charge memory element C1 is reversed. Then, the switch control module 100 controls the second switch K7 and the third switch K10 to be turned off. As shown in the t3 time period in Fig. 26; d) repeating steps a) to c), the battery E is continuously heated by charging and discharging until the battery E reaches the stop heating condition.

Another alternative mode of operation for the heating circuit provided in Figure 25 is described below in conjunction with Figure 29:

a) the switch control module 100 controls the first switch K6 to be turned on, and the battery E performs forward discharge (consistent with the time t1 of FIG. 26); b) After the forward discharge is completed, the switch control module 100 controls the first switch K6 to be turned off, and controls the second switch K7 to be turned on and off a plurality of times, and the first charge storage element C1 passes through the second switch K7 and the second current memory. The element L11 and the second unidirectional semiconductor element D12 reversely charge the battery E (as shown in the period t0 to t8 in FIG. 29), and simultaneously turn on the switch K4 or in the presence of the flow battery during reverse charging. The current is turned off after the second switch K7 is turned off to turn on the switch K4 so that the fourth unidirectional semiconductor element D16 functions as a freewheeling. For example, at time t0, K7 is turned on, the first charge memory element C1 charges the battery E through K7, L11, D15, and simultaneously stores the second current memory element L11, when the current of the second current memory element L11 rises to the first current. When setting the value, as at time t1 in Figure 29, the second switch K7 is turned off, and K11 is turned on (K11 can be turned on before K7 is turned off until the end of the recharge), and the inductor passes through the fourth switch K11 and the fourth one-way. The semiconductor element D16 performs freewheeling; when the current of the second current memory element L11 drops to the second current setting value, as at time t2 in FIG. 29, the second switch K7 is turned on again to start the next recharge.

c) when the voltage of the first charge storage element C1 reaches a second preset value (the second preset value is less than or equal to the battery voltage, as shown in FIG. 29 is the case where the second preset value is equal to the battery voltage) The switch control module 100 controls the second switch K7 to be turned off, and turns on the fourth switch K11 to maintain a freewheeling action; when the current flowing through the second current memory element L11 reaches the second current set value, the fourth switch is turned off. K11, the second switch K7 and the third switch K10 are turned on, and the equivalent circuit at this time is as shown in FIG. 28, and the waveform is as shown in the time period from t8 to t12 in FIG. 29, and the third unidirectional semiconductor element D15, A circuit composed of the second switch K7, the second current memory element L11, the second unidirectional semiconductor element D12, and the third switch K10 pours energy on the first charge memory element C1 to the battery E, and then the first charge memory element C1 The voltage polarity at both ends is reversed. At time t8, K7 and K10 are simultaneously turned on, and the first charge memory element C1 passes through the second switch K7, the third unidirectional semiconductor element D15, and the third The switch K10 stores the second current memory element L11. When the current of the second current memory element L11 rises to the first current setting value, the third switch K10 is turned off at time t9 in FIG. 29, and the second current memory element is turned off. L11 is freewheeled by the second switch K7 and the second unidirectional semiconductor element D12; when the current flowing through the second current memory element L11 falls to the second current setting value, as at time t10 in FIG. 29, the third switch K10 is again Turn on, start the next charge back until the capacitor voltage reaches the voltage setting. Turning on the second switches K7 and K10 when the current flowing through the second current memory element L11 is zero to reverse the polarity of the voltage across the first charge memory element C1; d) repeating steps a) to c), the battery E continuously passes Heating is performed by charging and discharging until the battery E reaches the heating stop condition.

With the heating circuit provided by the present invention, since the energy storage circuit is connected in series with the battery E, when the battery E is heated, since the first charge storage element C1 connected in series exists, the safety problem caused by the failure of the switching device 1 in the short circuit can be avoided.

The preferred embodiments of the present invention have been described in detail above with reference to the drawings, but the present invention is not limited to the specific details of the embodiments described above, and various simple modifications can be made to the technical solutions of the present invention within the scope of the technical idea of the present invention. Simple variations are within the scope of the invention.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention has various possible combinations. The method will not be explained otherwise. In addition, any combination of various embodiments of the invention may be made as long as it does not deviate from the idea of the invention, and it should be regarded as the disclosure of the invention.

1‧‧‧Switching device

100‧‧‧Switch Control Module

C1‧‧‧First charge memory element

E‧‧‧Battery

L1‧‧‧First Current Memory Element

R1‧‧‧damage element

Claims (34)

A heating circuit for a battery, the heating circuit comprising: a switching device; a damping component; a energy storage circuit for connecting to a battery, the energy storage circuit comprising a first current memory component and a first a charge memory component, the damper component, the switch device, the first current memory component and the first charge memory component are connected in series; a switch control module, the switch control module is connected to the switch device, and the switch control module is used Controlling the switching device to be turned on and off such that when the switching device is turned on, energy flows back and forth between the battery and the energy storage circuit; and an energy limiting circuit for limiting energy storage by the energy storage circuit The amount of current that the circuit flows to the battery. The heating circuit of claim 1, wherein the switching device comprises a first one-way branch for realizing energy flow from the battery to the energy storage circuit and for realizing energy flow from the energy storage circuit a second one-way branch of the battery, the switch control module being respectively connected to one or both of the first one-way branch and the second one-way branch for controlling the connected branch Turn on and off. The heating circuit of claim 2, wherein the energy limiting circuit comprises a second current memory element, the second current memory element being connected in series in the second one-way branch. The heating circuit of claim 3, wherein the switching device comprises a first switch, a first unidirectional semiconductor component and a second unidirectional semiconductor component, the first switch and the first unidirectional semiconductor The components are connected in series to form the first one-way branch, the second unidirectional semiconductor component constitutes the second one-way branch, and the switch control module is connected to the first switch for controlling the first switch Turning on and off to control the turning on and off of the first one-way branch, the second current memory element being in series with the second unidirectional semiconductor element. The heating circuit of the battery of claim 4, wherein the switching device further comprises a second switch located in the second one-way branch, the second switch being in series with the second unidirectional semiconductor component The switch control module is further connected to the second switch, and is configured to control on and off of the second one-way branch by controlling on and off of the second switch, the second current memory component being connected in series Between the second unidirectional semiconductor component and the second switch. The heating circuit of claim 5, further comprising a third unidirectional semiconductor component, a fourth unidirectional semiconductor component, a third switch, and a fourth switch; the fourth unidirectional semiconductor a cathode of the element is connected between the second switch and the second current storage element, an anode is connected to one end of the fourth switch, and the other end of the fourth switch is connected to a negative pole of the battery; the third unidirectional semiconductor element An anode is connected between the second unidirectional semiconductor component and the second current memory component, a cathode is connected to one end of the third switch, and the other end of the third switch is connected to a negative pole of the battery; the switch control module Also with the third switch and The fourth switch is connected to control the turning on and off of the third switch and the fourth switch. The heating circuit of claim 6, wherein the switch control module is configured to: control the first switch and the second switch to be turned on to cause energy to flow from the battery to the first charge storage element and from the The first charge storage element flows to the battery; when the voltage value across the first charge storage element reaches a first predetermined value that is greater than the battery voltage, the second switch is turned off, and the fourth switch is turned on; The fourth switch is turned off when the current flowing through the second current storage element is zero, and the second switch and the third switch are turned on to reverse the polarity of the voltage across the first charge storage element. The heating circuit of claim 6, wherein the switch control module is configured to: control the first switch and the second switch to be turned on to cause energy to flow from the battery to the first charge storage element and from the The first charge storage element flows to the battery; when the voltage value across the first charge storage element reaches a second predetermined value that is less than or equal to the battery voltage, the second switch is turned off, and the fourth switch is turned on; When the current flowing through the second current storage element reaches the second current setting value, turning off the fourth switch, turning on the second switch and the third switch; when the current flowing through the second current memory element reaches a first current setting Turning off the third switch to cause energy in the second current storage element to flow to the battery; turning on the second switch and the third switch when the current flowing through the second current storage element is zero The polarity of the voltage across the first charge storage element is reversed. The heating circuit of claim 1, wherein the heating circuit further comprises an energy superimposing unit, wherein the energy superimposing unit is connected to the energy storage circuit, and the switch control module controls the switching device to be turned on and off again. Thereafter, the energy in the tank circuit is superimposed with the energy in the battery. The heating circuit of claim 9, wherein the energy superimposing unit comprises a polarity inversion unit connected to the energy storage circuit for after the switching device is turned on and off again, The polarity of the voltage of the first charge storage element is inverted. The heating circuit of claim 1, wherein the heating circuit further comprises an energy transfer unit coupled to the energy storage circuit for storing the energy storage after the switching device is turned on and off again The energy in the circuit is transferred to an energy storage element. The heating circuit of claim 11, wherein the energy storage unit is a battery, the energy transfer unit includes a power refill unit, and the power refill unit is connected to the energy storage circuit for the switch device. After the turn-on and then turn off, the energy in the tank circuit is transferred to the energy storage element. The heating circuit of claim 1, wherein the heating circuit further comprises an energy superimposing and transferring unit connected to the energy storage circuit; the energy superimposing and transferring unit is configured to: after the switching device is turned on and off again, The energy superposition and transfer unit transfers energy in the tank circuit to the energy storage element, after which the remaining energy in the tank circuit is superimposed with the energy in the battery. The heating circuit of claim 13, wherein the energy superimposing and transferring unit comprises an energy superimposing unit and an energy transfer unit, and the energy transfer unit is connected to the energy storage circuit for conducting the switching device. After turning off, energy in the energy storage circuit is transferred to the energy storage element, and the energy superimposing unit is connected to the energy storage circuit for performing energy transfer in the energy storage unit after the energy transfer unit performs energy transfer The remaining energy is superimposed with the energy in the battery. The heating circuit of claim 14, wherein the energy storage component is the battery, the energy transfer unit comprises a power refill unit, and the power refill unit is connected to the energy storage circuit for After the switching device is turned on and then turned off, the energy in the energy storage circuit is transferred to the energy storage device, and the energy superimposing unit includes a polarity inversion unit, and the polarity inversion unit is connected to the energy storage circuit for After the power recirculation unit performs energy transfer, the voltage polarity of the first charge storage element is inverted. The heating circuit of claim 13, wherein the energy superimposing and transferring unit comprises a third DC-DC module, the third DC-DC module and the first charge storage element and the battery respectively connection, The switch control module is further connected to the third DC-DC module for transferring energy in the first charge storage element to the energy storage element by controlling the operation of the third DC-DC module. The remaining energy in the first charge storage element is then superimposed with the energy in the battery. The heating circuit of claim 10 or 15, wherein the polarity inversion unit comprises a first single pole double throw switch and a second single pole double throw switch, the first single pole double throw switch and the second The single-pole double-throw switch is respectively located at two ends of the first charge memory element, and the input line of the first single-pole double-throw switch is connected in the energy storage circuit, and the first outgoing line of the first single-pole double-throw switch is connected to the first charge memory a first plate of the component, a second outlet of the first single-pole double-throw switch is connected to a second plate of the first charge memory element, and an incoming line of the second single-pole double-throw switch is connected in the energy storage circuit a first output line of the second single-pole double-throw switch is connected to the second plate of the first charge memory element, and a second output line of the second single-pole double-throw switch is connected to the first portion of the first charge memory element a switch board, the switch control module is further connected to the first single pole double throw switch and the second single pole double throw switch, respectively, for changing the first single pole double throw switch and the second single pole double throw switch respectively The connection relationship between the incoming line and the outgoing line The voltage polarity of the first charge storage element is reversed. The heating circuit of claim 10 or 15, wherein the polarity inversion unit comprises a fifth unidirectional semiconductor component, a third current memory component, and a fifth switch, the first charge memory component, The third current memory element and the fifth switch are sequentially connected in series to form a loop, the fifth unidirectional semiconductor element and the first charge memory element being connected in series Between the third current storage element or the third current storage element and the fifth switch, the switch control module is further connected to the fifth switch for controlling the fifth switch to be turned on. The polarity of the voltage of a charge memory element is reversed. The heating circuit of claim 10 or 15, wherein the polarity inversion unit comprises a first DC-DC module and a second charge memory element, the first DC-DC module and the first A charge memory component and the second charge memory component are respectively connected, the switch control module is further connected to the first DC-DC module, and is configured to control the first DC-DC module to operate the first Transferring energy from the charge storage element to the second charge storage element, and then transferring the energy in the second charge storage element back to the first charge storage element to achieve voltage polarity of the first charge storage element Reverse. The heating circuit of claim 12 or 15, wherein the power refill unit comprises a second DC-DC module, the second DC-DC module and the first charge storage element and the battery Connected separately, the switch control module is further connected to the second DC-DC module, for transferring energy in the first charge storage element to the battery by controlling the operation of the second DC-DC module . The heating circuit of claim 1, wherein the heating circuit further comprises an energy consuming unit connected to the first charge storage element, the energy consuming unit is configured to: after the switching device is turned on and off again, The energy in the first charge storage element is consumed. The heating circuit of claim 21, wherein the energy consuming unit comprises a voltage control unit, the voltage control unit is coupled to the first charge storage element, and after the switching device is turned on and off again, The voltage value across the first charge storage element is converted to a voltage set point. The heating circuit of claim 9, wherein the heating circuit further comprises an energy consuming unit connected to the first charge storage element, the energy consuming unit is configured to: after the switching device is turned on and off again, The energy superimposing unit consumes energy in the first charge storage element before performing energy superposition. The heating circuit of claim 23, wherein the energy consuming unit comprises a voltage control unit coupled to the first charge storage element for after the switching device is turned on and off again, Before the energy superposition unit performs energy superposition, the voltage value across the first charge storage element is converted into a voltage set value. The heating circuit of claim 11, wherein the heating circuit further comprises an energy consuming unit connected to the first charge storage element, the energy consuming unit is configured to: after the switching device is turned on and off again, The energy transfer unit consumes energy in the first charge storage element before energy transfer, or consumes energy in the first charge storage element after the energy transfer unit performs energy transfer. The heating circuit of claim 25, wherein the energy consuming unit comprises a voltage control unit, and the voltage control unit The first charge storage element is connected to convert the voltage value across the first charge storage element into a voltage set value, or in the energy, after the switch device is turned on and off again, before the energy transfer unit performs energy transfer. After the transfer unit performs energy transfer, the voltage value across the first charge storage element is converted into a voltage set value. The heating circuit of claim 13, wherein the heating circuit further comprises an energy consuming unit connected to the first charge storage element, the energy consuming unit is configured to: after the switching device is turned on and off again, Before the energy superposition and transfer unit performs energy transfer, the energy in the first charge storage element is consumed, or before the energy superposition and energy transfer after the energy transfer and transfer unit performs energy superposition, in the first charge storage element Energy is consumed. The heating circuit of claim 27, wherein the energy consuming unit comprises a voltage control unit coupled to the first charge storage element for after the switching device is turned on and off again, Before the energy superposition and transfer unit performs energy transfer, the voltage value across the first charge storage element is converted into a voltage set value, or the energy is superimposed and the energy transfer is performed after the transfer unit performs energy transfer, the first The voltage value across the charge memory element is converted to a voltage set point. The heating circuit according to any one of claims 22, 24, 26 and 28, wherein the voltage control unit comprises a resistor and a sixth switch, the resistor and the sixth switch being connected in series after being connected in parallel The two ends of the first charge memory element, the switch control module is further connected to the sixth The switch control module is further configured to control the sixth switch to be turned on after controlling the switch device to be turned on and off again. The heating circuit according to any one of claims 9-16, wherein the switch control module is configured to: when the current flowing through the switch device is zero after the switch device is turned on, or After zero, the switch is turned off. The heating circuit of any one of claims 4 or 5, further comprising a freewheeling circuit for using the energy flowing from the energy storage circuit to the battery After the switching device is turned off, energy flow to the battery is maintained. The heating circuit of claim 31, wherein one end of the freewheeling circuit is connected to a negative pole of the battery, and the other end is connected to the second one-way branch to cause a freewheeling current to flow through the second current Memory component. The heating circuit of claim 1, wherein the damping element is a parasitic resistance inside the battery, and the first current memory element is a parasitic inductance inside the battery. The heating circuit of claim 1, wherein the damping element is a resistor, the first current memory element is an inductor, and the first charge memory element is a capacitor.