TWI454012B - 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 and the polarization will increase, thereby causing the capacity of the battery to decrease.

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 invention provides a heating circuit for a battery, the battery comprising a first battery E1 and a second battery E2, the heating circuit comprising: a first charging and discharging circuit, the first charging and discharging electricity The circuit is connected to the first battery E1, and includes a first damping element R1 connected in series, a first current memory element L1, a first switching device, and a first charge storage element C; and a second charging and discharging circuit, the The second charging and discharging circuit is connected to the second battery E2, and includes a second damping element R2, a second current memory element L2, a second switching device, and the first charge memory element C connected in series.

With the heating circuit of the battery provided by the present invention, it is possible to simultaneously heat a plurality of batteries by controlling the first switching device and/or the second switching device, or to separately heat some of the plurality of batteries. In addition, when the power of the plurality of batteries is unbalanced, the battery with more energy can be stored to the first charge storage element C through a charge and discharge circuit, and then the energy stored in the first charge memory element C is further A charge and discharge circuit is returned to the battery with less energy, thereby achieving the purpose of balancing the balance of the plurality of batteries.

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

100‧‧‧Switch Control Module

L1‧‧‧First Current Memory Element

L2‧‧‧Second current memory element

R1‧‧‧First damping element

R2‧‧‧second damping element

E1‧‧‧First battery

E2‧‧‧second battery

K3‧‧‧ first bidirectional switch

K4‧‧‧Second bidirectional switch

K5‧‧‧ third bidirectional switch

K6, K6a, K6b‧‧‧ first switch

D11, D11a, K6b‧‧‧ first unidirectional semiconductor components

D12, D12a, D12b‧‧‧ second unidirectional semiconductor components

K7‧‧‧second switch

R3, R4, R6‧‧‧ resistors

101‧‧‧Polar reversal unit

J1‧‧‧First single pole double throw switch

J2‧‧‧Second single pole double throw switch

C‧‧‧First charge memory element

D3‧‧‧ third unidirectional semiconductor component

L3‧‧‧ current memory component

K9, K1a, K1b, K7a, K7b‧‧ ‧ switch

102‧‧‧DC-DC Module

C1‧‧‧Second charge memory element

Q6‧‧‧bidirectional switch

a, b, c, d‧‧‧

D4, D5, D6, D7, D8‧‧‧ unidirectional semiconductor components

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

N1‧‧‧ first node

N2‧‧‧ second node

T1‧‧‧ first transformer

T2‧‧‧second transformer

Time period t1, t2, t3‧‧

IE1, IE2, IC‧‧‧ current

VC‧‧‧ voltage

T‧‧‧ work cycle

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 of a heating circuit of a battery provided by the present invention; and FIGS. 2A to 2F are respectively schematic views of an embodiment of the first switching device and/or the second switching device in FIG. 1 . Fig. 3 is a schematic view showing a first embodiment of a heating circuit for a battery provided by the present invention; and Figs. 4A to 4C are respectively an implementation of the polarity inversion unit in Fig. 3; 4D is a schematic view of a specific embodiment of a DC-DC module in FIG. 4C; FIG. 5A is a schematic view showing a second embodiment of a heating circuit of a battery provided by the present invention; 5A is a waveform timing diagram corresponding to the heating circuit; FIG. 6A is a schematic diagram of a third embodiment of the heating circuit of the battery provided by the present invention; and FIG. 6B is a waveform timing diagram corresponding to the heating circuit of FIG. 6A .

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 switch of the device itself can realize the on-off control, and can be a one-way switch, for example, 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 with reversed-current diode (Insulated Gate Bipolar) Transistor, insulated gate bipolar transistor, etc.; when referred to hereinafter, the term "bidirectional switch" refers to a bi-directionally conductive switch that can be controlled by an electrical signal or with on-off control according to the characteristics of the device itself. a switch, such as a MOSFET or an IGBT with an anti-freewheeling diode; 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" refers to any device that can implement charge storage, such as a capacitor, etc.; as referred to hereinafter, the term "current memory element" refers to any device that can store current, such as an inductor, etc.; as referred to below, the term " "Forward" refers to the direction in which energy flows from the battery to the tank circuit, and 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 (such as lithium-ion batteries, nickel-cadmium batteries, nickel-hydrogen batteries or lead-acid batteries, etc.); The term "damping element" refers to any device that obstructs the flow of current to achieve energy consumption, such as electrical resistance, etc.; when referred to hereinafter, the term "main circuit" refers to the battery and damping element, the switching device, and the storage. A circuit in which circuits can be connected in series.

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 refer to a battery pack that contains internal parasitic resistance and parasitic inductance; therefore, those skilled in the art should understand that when the "battery" does not contain internal parasitic resistance and parasitic inductance, or internal parasitic resistance When the resistance of the resistance and the inductance of the parasitic inductance are small, the first damping element R1 and the second damping element R2 refer to the externally connected damping element, and the first current memory element L1 and the second current memory element L2 Is the battery's external current memory component; when the "battery" contains internal parasitic electricity In the battery pack with resistance and parasitic inductance, the first damper elements R1 and R2 may refer to both the damper element external to the battery and the parasitic resistance inside the battery pack, and likewise, the first current memory element L1 and the second current memory element. L2 can refer to the current memory component connected to the battery or the 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, the heating condition of the battery and the stop heating condition can be set according to the actual environmental conditions, so as to more accurately control the temperature of the battery, thereby ensuring the charge and discharge performance of the battery.

Fig. 1 is a schematic view showing a heating circuit of a battery provided by the present invention. As shown in FIG. 1, the present invention provides a heating circuit for a battery, the battery comprising a first battery E1 and a second battery E2, the heating circuit comprising: a first charging and discharging circuit, the first charging and discharging circuit and the first The battery E1 is connected, including a first damping element R1 connected in series, a first current memory element L1, a first switching device 1, and a first charge storage element C; and a second charging and discharging circuit, the second charging and discharging circuit and the The second battery E2 is connected, and includes a second damping element R2 connected in series, a second current memory element L2, a second switching device 2, and a first charge memory element C.

The first damper element R1 and the second damper element R2 may be parasitic resistances inside the first battery E1 and the second battery E2, respectively, and the first current memory element L1 and the second current memory element L2 may be the first battery E1, respectively. And the parasitic inductance inside the second battery E2.

The heating circuit may further include a switch control module 100. The switch control module 100 is connected to the first switch device 1 and the second switch device 2 for controlling the first switch device. 1 and switching of the second switching device 2 such that when the first switching device 1 and/or the second switching device 2 are turned on, energy reciprocates between the first battery E1 and the first charging and discharging circuit And/or energy reciprocatingly flowing between the second battery E2 and the second charging and discharging circuit, thereby causing the first damping element R1 and/or the second damping element R2 to generate heat, thereby achieving heating of the battery. .

The switch control module 100 can be a single controller. By setting the internal program, the on/off control of different external switches can be realized. The switch control module 100 can also be multiple controllers, for example, for each The external switch is provided with the corresponding switch control module 100, and 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.

Preferably, the switch control module 100 is configured to control the first switching device 1 to be turned on and the second switching device 2 to be turned off when the power of the first battery E1 is greater than the power of the second battery E2, and the first battery E1 is given The first charge storage element C is charged; after that, when the current in the first charge and discharge circuit is zero through the positive half cycle, the switch control module 100 controls the first switch device 1 to be turned off, and the second switch device 2 Turning on, the first charge storage element C charges the stored amount of electricity into the second battery E2, thereby achieving the purpose of battery energy equalization.

2A to 2F are schematic views respectively showing an embodiment of the first switching device and/or the second switching device in Fig. 1. Various embodiments of the first switching device and/or the second switching device will be described below with reference to FIG. 2A and FIG. 2F.

In order to realize the reciprocating flow of energy between the battery and the charging and discharging circuit, according to an embodiment of the present invention, the first switching device 1 and/or the second switching device 2 may be the first bidirectional switch K3, as shown in FIG. 2A. Shown. The switch control module 100 controls the turn-on and turn-off of the first bidirectional switch K3. When the battery needs to be heated, the first bidirectional switch K3 can be turned on, such as suspending heating. Alternatively, the first bidirectional switch K3 may be turned off when heating is not required.

The switching device is implemented by using a first bidirectional switch K3 alone, the circuit is simple, and the system area is small and easy to implement. However, in order to achieve the shutdown of the reverse current, the present invention also provides a preferred embodiment of the following switching device.

Preferably, the first switching device 1 and/or the second switching device 2 may comprise a first one-way branch for realizing energy flow from the battery to the charge and discharge circuit and a second single for realizing energy flow from the charge and discharge circuit to the battery To the branch, the switch control module 100 is coupled to one or both of the first one-way branch and the second one-way branch to control the turn-on and turn-off of the connected branch.

When the battery needs to be heated, turning on both the first one-way branch and the second one-way branch, such as suspending heating, may choose to turn off one or both of the first one-way branch and the second one-way branch When the heating is not required, both the first one-way branch and the second one-way branch can be turned off. Preferably, both the first one-way branch and the second one-way branch can be controlled by the switch control module 100, so that energy forward flow and reverse flow can be flexibly realized.

As another embodiment of the switching device, as shown in FIG. 2B, the first switching device 1 and/or the second switching device 2 may include a second bidirectional switch K4 and a third bidirectional switch K5, and a second bidirectional switch K4 and The three bidirectional switches K5 are connected in reverse to each other to form a first one-way branch and a second one-way branch, and the switch control module 100 is respectively connected to the second bidirectional switch K4 and the third bidirectional switch K5 for control The second bidirectional switch K4 and the third bidirectional switch K5 are turned on and off to control the on and off of the first one-way branch and the second one-way branch.

When the battery needs to be heated, the second bidirectional switch K4 and the third bidirectional switch K5 may be turned on, and if the heating is suspended, one or both of the second bidirectional switch K4 and the third bidirectional switch K5 may be selectively turned off. Turn off the second bidirectional switch K4 and the third bidirectional switch when heating is required K5 can be. The implementation of the switching device can control the conduction and the off of the first one-way branch and the second one-way branch, respectively, and flexibly realize the forward and reverse energy flow of the circuit.

As another embodiment of the switching device, as shown in FIG. 2C, the first switching device 1 and/or the second switching device 2 may include 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 unidirectional branch, the second unidirectional semiconductor component D12 constitutes a second unidirectional branch, and the switch control module 100 and the first The switch K6 is connected for controlling the on and off of the first one-way branch by controlling the on and off of the first switch K6. In the switching device shown in Fig. 2C, when heating is required, the first switch K6 can be turned on, and when heating is not required, the first switch K6 can be turned off.

The implementation of the switching device as shown in Fig. 2C, 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 provides another embodiment of the switching device. As shown in FIG. 2D, the first switching device 1 and/or the second switching device 2 may further include a second switch K7 located in the second one-way branch. The second switch K7 is connected in series with the second unidirectional semiconductor component D12, and the switch control module 100 is further connected to the second switch K7 for controlling the second one-way branch by controlling the on and off of the second switch K7. Turn on and off. Thus, in the switching device shown in Fig. 2D, since the switches (i.e., the first switch K6 and the second switch K7) are present on both of the one-way branches, the shut-off function in the forward and reverse flow of energy is provided.

Preferably, the first switching device 1 and/or the second switching device 2 may further comprise a resistor in series with the first one-way branch and/or the second one-way branch for reducing the current of the charging and discharging circuit and avoiding Excessive current causes damage to the battery. For example, the switch can be shown in Figure 2B A resistor R6 connected in series with the second bidirectional switch K4 and the third bidirectional switch K5 is added to obtain another implementation of the switching device, as shown in FIG. 2E. Also shown in Fig. 2F is an embodiment of a switching device obtained by connecting a resistor R3 and a resistor R4 in series on two unidirectional branches of the switching device shown in Fig. 2D.

For embodiments in which energy flows back and forth between the battery and the charge and discharge circuit, the switching device can be turned off at any point in one cycle or cycles, and the turn-off time of the switching device can be any time, such as flowing through the switching device. The current can be turned off when the current is forward/reverse, and when it is zero/non-zero. According to the required shutdown strategy, different implementation forms of the switching device can be selected. If it is only necessary to turn off the forward current flow, the implementation form of the switching device shown in FIG. 2A and FIG. 2C can be selected. If both forward current and reverse current need to be turned off, it is necessary to select two unidirectional branches as shown in Figure 2B and Figure 2D.

Fig. 3 is a schematic view showing a first embodiment of a heating circuit for a battery provided by the present invention. As shown in FIG. 3, the heating circuit of the present invention may further include a polarity inversion unit 101 connected to the first charge memory element C for voltage polarity of the first charge memory element C. Reverse. The switch control module 100 is connected to the first switching device 1, the second switching device 2, and the polarity reversing unit 101 for performing a negative half cycle of current in the first charging and discharging circuit and/or the second charging and discharging circuit. When it is zero, the first switching device 1 and/or the second switching device 2 are controlled to be turned off, and then the polarity inversion unit 101 is controlled to invert the polarity of the voltage of the first charge storage element C. Since the voltage of the first charge storage element C after polarity inversion can be added in series with the voltages of the first battery E1 and the second battery E2, when the first switching device 1 and/or the second switching device 2 are turned on again, The current in the first charge and discharge circuit and/or the second charge and discharge circuit is increased.

4A and 4C are schematic views of an embodiment of the polarity inversion unit in Fig. 3, respectively. Various embodiments for performing the polarity inversion unit 101 will be described below with reference to FIGS. 4A to 4C.

As an embodiment of the polarity inversion unit 101, as shown in FIG. 4A, the polarity inversion unit 101 includes a first single pole double throw switch J1 and a second single pole double throw switch J2, a first single pole double throw switch J1 and a second The single-pole double-throw switch J2 is respectively located at two ends of the first charge memory element C, and the incoming line of the first single-pole double-throw switch J1 is connected in the first and second charging and discharging circuits, and the first outgoing connection of the first single-pole double-throw switch J1 a first plate of the first charge memory element C, a second output line of the first single-pole double-throw switch J1 is connected to the second plate of the first charge memory element C, and an incoming line of the second single-pole double-throw switch J2 is connected In the first and second charging and discharging circuits, the first outgoing line of the second single-pole double-throw switch J2 is connected to the second plate of the first charge storage element C, and the second output of the second single-pole double-throw switch J2 is a wire is connected to the first plate of the first charge memory element C, and the switch control module 100 is further connected to the first single-pole double-throw switch J1 and the second single-pole double-throw switch J2, respectively, for changing the The respective single-pole double-throw switch J1 and the second single-pole double-throw switch J2 are respectively inserted And connection relationship to line voltage polarity reversing the charge of the first memory element C.

According to this embodiment, the connection relationship between the incoming and outgoing lines of the first single-pole double-throw switch J1 and the second single-pole double-throw switch J2 can be set in advance so that when the first switching device 1 and/or the second switching device 2 are When conducting, the incoming line of the first single-pole double-throw switch J1 is connected to its first outgoing line, and the incoming line of the second single-pole double-throwing switch J2 is connected to its first outgoing line, when the first switching device 1 and the second switching device 2 are turned off. When the switch control module 100 controls the incoming line of the first single-pole double-throw switch J1 to be switched to be connected to the second outgoing line thereof, and the incoming line of the second single-pole double-throw switch J2 is switched to be connected to the second outgoing line thereof, thereby The charge memory element C achieves the purpose of voltage polarity inversion.

As another embodiment of the polarity inversion unit 101, as shown in FIG. 4B, the polarity inversion unit 101 includes a third unidirectional semiconductor element D3, a current memory element L3, and a switch K9 connected in series, and the series circuit is connected in parallel At both ends of the first charge memory element C, the switch control module 100 is further connected to the switch K9 for inverting the voltage polarity of the first charge memory element C by controlling the switch K9 to be turned on.

According to the above embodiment, when the first switching device 1 and the second switching device 2 are turned off, the switch K9 can be controlled to be turned on by the switch control module 100, whereby the first charge storage element C and the third unidirectional semiconductor element D3 The current memory element L3 and the switch K9 form an LC tank circuit, and the first charge memory element C is discharged through the current memory element L3. After the current on the tank circuit flows through the negative half cycle, the current flowing through the current memory element L3 is zero. The purpose of inverting the polarity of the first charge memory element C voltage.

As another embodiment of the polarity inversion unit 101, as shown in FIG. 4C, the polarity inversion unit 101 includes a DC-DC module 102 and a second charge memory element C1, and the DC-DC module 102 and the first charge The memory component C and the second charge memory component C1 are respectively connected, and the switch control module 100 is further connected to the DC-DC module 102 for operating the first charge memory component C by controlling the operation of the DC-DC module 102. The energy is transferred to the second charge storage element C1, and the energy in the second charge storage element C1 is reversely transferred back to the first charge storage element C to achieve a reversal of the voltage polarity of the first charge storage element C. .

The DC-DC module 102 is a DC-DC converter circuit commonly used in the art for realizing voltage polarity reversal. The present invention does not impose any limitation on the specific circuit structure of the DC-DC module 102, as long as the first charge can be realized. The polarity of the voltage of the memory element C can be reversed, and those skilled in the art can add, replace or delete the components in the circuit according to the needs of the actual operation.

FIG. 4D is a schematic diagram of a specific embodiment of the DC-DC module 102 provided by the present invention. As shown in FIG. 4D, the DC-DC module 102 includes a bidirectional switch Q1, a bidirectional switch Q2, a bidirectional switch Q3, a bidirectional switch Q4, a first transformer T1, a unidirectional semiconductor component D4, a unidirectional semiconductor component D5, and a current memory. Element L4, bidirectional switch Q5, bidirectional switch Q6, second transformer T2, unidirectional semiconductor element 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.

The first leg, the fourth leg, and the fifth leg of the first transformer T1 are the same name end, and the second leg and the third leg 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 second charge memory device 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 and the bidirectional switch of the bidirectional switch Q1. The drain of Q3 is connected, the source of the bidirectional switch Q2 is connected to the drain of the bidirectional switch Q4, and the source of the bidirectional switch Q3 and the bidirectional switch Q4 is connected to the b terminal of the second charge storage element C1, thereby forming a full bridge circuit. At this time, the voltage polarity of the second charge memory element C1 is positive at the a terminal 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 C1 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 L4, and the other end of the current memory element L4 is connected to the d terminal of the second charge memory element C1; the 4 pin of the transformer T1 and the second charge storage element C1 C-terminal connection, unidirectional semiconductor component D8 The anode is connected to the d terminal of the second charge memory device C1, and the cathode of the unidirectional semiconductor device D8 is connected to the b terminal of the second charge memory device C1. At this time, the voltage polarity of the second charge memory device C1 is negative at the c terminal. The d end is positive.

The c-terminal of the second charge storage element C1 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 C, The 4 pin of the transformer T2 is connected to the a terminal of the first charge memory element C, 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 C1.

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 DC-DC module 102 is described below:

1. After the first switching device 1 and the second switching device 2 are turned off, the switch control module 100 controls the bidirectional switch Q5 and the bidirectional switch Q6 to be turned off, and controls the bidirectional switch Q1 and the bidirectional switch Q4 to be simultaneously turned on to form the A phase, and the control is performed. The bidirectional switch Q2 and the bidirectional switch Q3 are 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 circuit operates, the first charge memory element C The upper energy is transferred to the second charge storage element C1 through the first transformer T1, the unidirectional semiconductor element D4, the unidirectional semiconductor element D5, and the current memory element L4. At this time, the voltage polarity of the second charge memory element C1 is c-terminal. Negative, the d end is positive.

3. The switch control module 100 controls the bidirectional switch Q5 to be turned on, the second charge The memory element C1 forms a path with the first charge memory element C through the second transformer T2 and the unidirectional semiconductor element D8, whereby the energy on the second charge memory element C1 is reversely transferred to the first charge memory element C, wherein part The energy will be stored on the second transformer T2; at this time, the switch control module 100 controls the bidirectional switch Q5 to be turned off, the bidirectional switch Q6 is closed, and the second transformer T2 and the unidirectional semiconductor component D6 are stored on the second transformer T2. The energy is transferred to the first charge memory element C. At this time, the polarity of the voltage of the first charge memory element C is reversed to be negative at the a terminal and positive at the b terminal, thereby reversing the polarity of the voltage of the first charge storage device C. the goal of.

Fig. 5A is a schematic view showing a second embodiment of the heating circuit of the battery provided by the present invention. As shown in FIG. 5A, the first switching device 1 is a switch K1a, the second switching device 2 is a switch K1b, and the polarity inversion unit 101 includes a third unidirectional semiconductor device D3 and a switch K9 connected in series. And a current memory element L3 connected in parallel across the first charge memory element C to perform polarity inversion of the voltage of the first charge memory element C.

Fig. 5B is a waveform timing chart corresponding to the heating circuit of Fig. 5A. The operation of the heating circuit shown in Fig. 5A will be described below with reference to Fig. 5B. First, the switch control unit 100 controls the switch K1a and the switch K1b to be turned on, and the switch K9 is turned off. At this time, the first battery E1 and the second battery E2 simultaneously charge the first charge storage element C (see time period t1); When the current IE1 and the current IE2 of the first battery E1 and the second battery E2 are zero during the positive half cycle, the voltage VC of the first charge memory element C reaches a maximum value, and the energy stored by the first charge memory element C begins to be reversed. Up to the first battery E1 and the second battery E2, and ending when the current half IE1 and the current IE2 are zero (see the time period t2); after that, the switch control unit 100 controls the switch K1a, the switch K1b is turned off, and the switch K9 Turning on, the polarity inversion unit 101 starts polarity inversion of the first charge storage element C, and the polarity inversion occurs when the current IC flowing through the first charge memory element C is zero during the negative half period. End (see time period t3, at which point a complete duty cycle T is completed), the switch control unit 100 controls the switch K9 to turn off. Thereafter, the above operation can be looped so that current flows through the first damper element R1 and the second damper element R2, and the first damper element R1 and the second damper element R2 generate heat, thereby heating the first batteries E1 and E2.

FIG. 5B shows a case where the first batteries E1 and E2 are simultaneously heated, and of course, the first switching device 1 and the second switching device 2 can be controlled according to actual needs to achieve heating of a single battery. In addition, the turn-off control of the switch K1a and the switch K1b can be performed in the grid section shown in FIG. 5B.

Fig. 6A is a schematic view showing a third embodiment of the heating circuit of the battery provided by the present invention. As shown in FIG. 6A, the first switching device 1 includes a first one-way branch formed by the first switch K6a being connected in series with the first unidirectional semiconductor element D11a, and a switch K7a and the second unidirectional semiconductor element D12a. A second one-way branch formed in series, the first one-way branch and the second one-way branch being connected in anti-parallel. The second switching device 2 includes a first unidirectional branch formed by connecting the first switch K6b in series with the first unidirectional semiconductor element D11b and a second one formed by connecting the switch K7b and the second unidirectional semiconductor element D12b in series To the branch, the first one-way branch is connected in anti-parallel with the second one-way branch. The polarity inversion unit 101 includes a third unidirectional semiconductor element D3, a switch K9, and a current memory element L3 connected in series, the series circuit being connected in parallel across the first charge memory element C to apply voltage to the first charge memory element C. Perform polarity reversal.

Fig. 6B is a waveform timing chart corresponding to the heating circuit of Fig. 6A. The operation of the heating circuit shown in Fig. 6A will be described below with reference to Fig. 6B. First, the switch control unit 100 controls the first switch K6a to be turned on, and the switch K7b, the switch K9, the switch K7a, and the first switch K6b are turned off, at which time the second battery E2 charges the first charge storage element C (see time period t1); when When the current IE2 flowing through the second battery E2 is zero during the positive half cycle, the switch control unit 100 controls the first switch K6a to be turned off, and the switch K7b is turned on, at which time the energy stored by the first charge memory element C begins to be reversely charged to The first battery E1 ends when the current IE1 flowing through the first battery E1 is zero by the negative half cycle (see time period t2); after that, the switch control unit 100 controls the first switch K6a, the switch K7b to be turned off, and the switch K9 Turning on, the polarity inversion unit 101 starts polarity inversion of the first charge memory element C, and when the current IC flowing through the first charge memory element C is zero by the negative half period, the polarity inversion ends (see time period t3). At this time, a complete duty cycle T) is completed, and the switch control unit 100 controls the switch K9 to be turned off. After that, the above operation can be looped, so that the energy of the second battery E2 with more electric energy flows into the first charge memory element C, and then the first battery E1 with less electric charge flows through the first charge memory element C, thereby reaching the battery. The purpose of power balance. Moreover, during this period, a current flows through the first damper element R1 and the second damper element R2, and the first damper element R1 and the second damper element R2 generate heat, and the purpose of heating the first batteries E1 and E2 can also be achieved at the same time.

It should be noted that the battery returns its own energy to itself, which can achieve the purpose of heating the battery; the battery returns its own energy to itself and other batteries, which can achieve the function of battery heating and energy balance. Although the present specification describes only the heating circuit for the first battery E1 and the second battery E2, the present invention can be extended to a plurality of battery solutions to achieve simultaneous heating, separate heating, and power balance of the plurality of batteries. In addition, the duration of each of the above time periods is adjustable to control the effective current value of the battery.

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.

100‧‧‧Switch Control Module

L1‧‧‧First Current Memory Element

L2‧‧‧Second current memory element

R1‧‧‧First damping element

R2‧‧‧second damping element

E1‧‧‧First battery

E2‧‧‧second battery

Claims (15)

A heating circuit for a battery, the battery comprising a first battery and a second battery, the heating circuit comprising: a first charging and discharging circuit, the first charging and discharging circuit being connected to the first battery, comprising a series connected a damper element, a first current memory element, a first switching device, and a first charge storage element; and a second charge and discharge circuit, the second charge and discharge circuit being coupled to the second battery, including a second in series a damping element, a second current storage element, a second switching device, and the first charge storage element. The heating circuit of claim 1, wherein the first damping element and the second damping element are parasitic resistances inside the first battery and the second battery, respectively, the first current memory element and The second current memory element is a parasitic inductance inside the first battery and the second battery, respectively. The heating circuit of claim 1, wherein the heating circuit further comprises: a switch control module, wherein the switch control module is coupled to the first switch device and the second switch device for controlling the Turning on and off of the first switching device and the second switching device such that when the first switching device and/or the second switching device are turned on, energy reciprocates between the first battery and the first charging and discharging circuit Flow and/or energy reciprocates between the second battery and the second charge and discharge circuit. The heating circuit of claim 1, wherein the heating circuit further comprises: a switch control module, wherein the switch control module is coupled to the first switch device and the second switch device for When the electric quantity of the first battery is greater than the electric quantity of the second battery, the first switching device is controlled to be turned on, the second switching device is turned off, and the first battery charges the first charge storage element; When the current in the first charging and discharging circuit is zero during the positive half cycle, the switch control module controls the first switching device to be turned off and the second switching device to be turned on, and the first charge storage device stores the amount of power stored therein. Charged into the second battery. The heating circuit of claim 1, wherein the first switching device and/or the second switching device are first bidirectional switches. The heating circuit of claim 1, wherein the first switching device and the second switching device both comprise: a first one-way branch for achieving energy flow from the battery to the charge and discharge circuit; and a second one-way branch for achieving energy flow from the charge and discharge circuit to the battery, or the first switching device and the second switch One of the devices includes the first one-way branch and the second one-way branch. The heating circuit of claim 6, wherein the first switching device and/or the second switching device comprise: a second bidirectional switch; and a third bidirectional switch, the second bidirectional switch and The third bidirectional switches are reversely connected in series to each other to constitute the first one-way branch and the second one-way branch. The heating circuit of claim 6, wherein the first switching device and/or the second switching device comprise: a first switch; a first unidirectional semiconductor element, a second unidirectional semiconductor component, The first switch and the first unidirectional semiconductor element are connected in series to each other to constitute the first unidirectional branch; and the second unidirectional semiconductor element, the second unidirectional semiconductor element constitutes the second unidirectional branch. The heating circuit of the battery of claim 8, wherein the first switching device and/or the second switching device further comprises: a second switch located in the second one-way branch, The second switch is in series with the second unidirectional semiconductor component. The heating circuit of claim 6, wherein the first switching device further comprises a resistor in series with the first one-way branch and/or the second one-way branch; and/or The second switching device also includes a resistor in series with the first one-way branch and/or the second one-way branch. The heating circuit of claim 1, wherein the heating circuit further comprises: a polarity inversion unit coupled to the first charge storage element for the first charge storage element The polarity of the voltage is reversed. The heating circuit of claim 11, 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 single pole cutter Double throw switches are respectively located at two ends of the first charge memory element, and an input line of the first single pole double throw switch is connected in the first and second charge and discharge circuits, and the first one of the first single pole double throw switches Outgoing connection first a first plate of the charge memory element, a second output 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 first and second charging and discharging circuits, a first output line of the second single-pole double-throw switch is connected to a second electrode of the first charge memory element, and a second output line of the second single-pole double-throw switch A first plate of the first charge memory element is coupled. The heating circuit of claim 11, wherein the polarity inversion unit comprises: a third unidirectional semiconductor component, a current memory component and a switch connected in series, the series circuit being connected in parallel to the first charge memory Both ends of the component. The heating circuit of claim 11, wherein the polarity inversion unit comprises: a DC-DC module; and a second charge memory element, the DC-DC module and the first charge memory The component and the second charge storage component are respectively connected to transfer the electric quantity in the first charge storage element to the second charge storage element, and then reversely transfer the electric quantity in the second charge storage element back to the The first charge storage element is described to effect an inversion of the voltage polarity of the first charge storage element. The heating circuit of claim 11, wherein the heating circuit further comprises: a switch control module, wherein the switch control module is connected to the first switch device, the second switch device, and the polarity inversion unit, For controlling the first switching device and/or the second switching device to be turned off when the current in the first charging and discharging circuit and/or the second charging and discharging circuit is zero through a negative half cycle, and then controlling the polarity inversion unit to The polarity of the voltage of a charge memory element is reversed.