TWI493830B - 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, charging the battery will result in an increase in the impedance of the battery and an increase in polarization, resulting in a decrease in the capacity of the battery.

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 and an increase in polarization to cause a decrease in the capacity of the battery under low temperature conditions. 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 invention comprises a plurality of switching devices, a switch control module, a damping element R1, a storage circuit and a polarity reversing unit; a battery connection, the energy storage circuit includes a first current memory element L1 and a plurality of charge memory elements C1, and the plurality of charge memory elements C1 are connected in series with the plurality of switching devices to form a plurality of branches, the plurality of branches The circuits are connected in parallel with the first current memory element L1 and the damping element R1; the switch control module is connected to the switching device for controlling the switching device to be turned on and off, so that when the switching device is turned on, the energy is Reciprocatingly flowing between the battery and the energy storage circuit; the polarity inversion unit is connected to the energy storage circuit for inverting voltage polarity of the plurality of charge memory elements C1 after the switching device is turned on and off again .

The heating circuit provided by the invention can improve the charging and discharging performance of the battery, and since the energy storage circuit is connected in series with the battery in the heating circuit, when the battery is heated, the switching device can be prevented from being invalid due to the existence of the series connected charge memory element C1. The safety problem caused by excessive current during short circuit 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

3‧‧‧One-way switch

100‧‧‧Switch Control Module

101‧‧‧Polar reversal unit

C1‧‧‧ Charge Memory Element

C1a, C1b‧‧‧ charge memory unit

D1‧‧‧ unidirectional semiconductor components

D11‧‧‧ first unidirectional semiconductor component

D12‧‧‧Second unidirectional semiconductor component

E‧‧‧Battery

I _C1a ‧‧‧ Current

K1a, K1b‧‧‧ bidirectional switch

K2‧‧‧ switch

K3‧‧‧ first bidirectional switch

K4‧‧‧Second bidirectional switch

K5‧‧‧ third bidirectional switch

K6‧‧‧ first switch

K7‧‧‧second switch

L1‧‧‧First Current Memory Element

L2‧‧‧Second current memory element

R1‧‧‧damage element

R2, R3, R6‧‧‧ resistance

V _C1a ‧‧‧ voltage

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. Schematic diagram of an embodiment; FIG. 4 is a schematic diagram of an embodiment of the switching device of FIG. 1; FIG. 5 is a schematic diagram of an embodiment of the switching device of FIG. 1; 6 is a schematic view showing an embodiment of the switching device in FIG. 1; FIG. 7 is a schematic view showing an embodiment of the switching device in FIG. 1; and FIG. 8 is a polarity inverting unit in FIG. Schematic diagram of an embodiment; FIG. 9 is a schematic diagram of an embodiment of a polarity inversion unit in FIG. 1; and FIG. 10 is a schematic diagram of an embodiment of a one-way switch in FIG. 8 and FIG. 11 is a schematic diagram of an embodiment of a heating circuit of a battery provided by the present invention; FIG. 12 is a waveform diagram corresponding to a heating circuit of the battery provided in FIG. 11; and FIG. 13 is another diagram of a heating circuit of the battery provided by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 14 is a schematic view showing still another embodiment of a heating circuit for a battery provided by the present invention.

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 Device from The switch that realizes the on-off control of the body 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 effect. (Metal Oxide Semiconductor Field Effect Transistor, MOSFET) or IGBT (Insulated Gate Bipolar Transistor) with reversed-current diodes; when referred to below, the term "bidirectional switch" refers to It is a bi-directional switch that can realize on-off control by electric signal or on-off control according to the characteristics of the component itself, such as MOSFET or IGBT with anti-freewheeling diode; when mentioned below, 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 component" refers to any device that can implement charge storage, such as a capacitor or the like; when mentioned below , the term "current memory element" means any device that can store current, such as an inductor, etc.; 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 a primary battery (eg, a dry battery) , alkaline batteries, etc.) and secondary batteries (such as lithium-ion batteries, nickel-cadmium batteries, nickel-hydrogen batteries or lead-acid batteries, etc.); when referred to below, the term "damping element" means any hindrance to the flow of current The device for achieving energy consumption may be, for example, a resistor or the like.

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 resistance value of the internal parasitic resistance and the inductance value of the parasitic inductance is small, the damping element R1 refers to Is the external damper element of the battery The first current memory element L1 refers to a current storage element external to the battery; when the "battery" is a battery pack including internal parasitic resistance and parasitic inductance, the damping element R1 may be referred to as a damper element external to the battery, or Refers to the parasitic resistance inside the battery pack. Similarly, the first current memory element L1 may refer to a current storage element 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, 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.

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 plurality of switching devices 1, a switch control module 100, and a damping element R1. The energy storage circuit and the polarity inversion unit 101. In an embodiment of the invention, the energy storage circuit is connected to the battery E. The energy storage circuit includes a first current memory element L1 and a plurality of charge memory elements C1, a plurality of charge memory elements C1 and a plurality of switching devices 1 One-to-one correspondingly constitutes a plurality of branches in series, and the plurality of branches are connected in parallel with the first current memory element L1 and the damping element R1, and the switch control module 100 is connected to the switching device 1 for controlling the switching device 1 to be turned on and Turning off, so that when the switching device 1 is turned on, energy flows back and forth between the battery E and the energy storage circuit, and the polarity inversion unit 101 is connected to the energy storage circuit for turning off after the switching device 1 is turned on, The voltage polarities of the plurality of charge memory elements C1 are inverted. It should be noted that the above-mentioned energy storage circuit is only a preferred embodiment of the present invention, and the energy storage circuit can perform energy flow between the battery E and the battery E as long as it can satisfy the storage of energy. Therefore, those skilled in the art can base In this regard, the above-described energy storage circuit is equivalently modified or changed to achieve the effect of energy storage, and these should be included in the protection of the present invention.

Considering the different characteristics of different types of battery E, if the parasitic resistance and the parasitic inductance of 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 may also be a battery. Internal parasitic inductance.

The switch control module 100 can control the switching device 1 to cause energy to flow from the battery E to the respective charge storage elements C1 simultaneously or sequentially, and to cause energy to flow back to the battery E simultaneously or sequentially from the respective charge storage elements C1. Wherein, the above-mentioned energy "synchronous" flow to the respective charge memory elements C1 and "simultaneous" flow back to the battery E can be realized by controlling the respective switching devices of the plurality of branches to be simultaneously turned on. The above-described flow of energy to the respective charge storage elements C1 "sequentially" and "sequential" flow back to the battery can be achieved by controlling the respective switching devices 1 of the plurality of branches to be turned on in a certain order. For example, a plurality of switching devices 1 can be turned on at different times, so that different branches can be charged and discharged at different times; and a plurality of switching devices 1 can be grouped into switching device groups, and each switch in each switching device group The devices are turned on at the same time, and each group of switching devices is turned on at different times, so that different times of charging and discharging of the branches for each group of switching devices can be realized. Preferably, the switch control module 100 can control the switching device 1 such that energy flows simultaneously from the battery E to the plurality of charge storage elements C1, and energy flows from the respective charge storage elements C1 to the battery E in sequence. In this embodiment, when the current is flowing forward, the battery E is discharged, and the energy storage circuit can be simultaneously connected with the battery E to increase the current; when the current flows in the opposite direction, the battery E is charged, and the energy storage can be performed at this time. The circuit is in communication with the battery E in order to reduce the current flowing through the battery E.

The switching device 1 has various implementations, and the present invention does not limit the implementation of the switching device. As an embodiment of the switching device 1, the switching device 1 is a first bidirectional switch K3, as shown in Figure 2. 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. If the heating is suspended or the heating is not required, the first bidirectional switch K3 is turned off. can.

The switching device 1 is realized by using a first bidirectional switch K3 alone, the circuit is simple, the system area is small, and the implementation is easy, but the circuit function is obviously limited, for example, the reverse current cannot be turned off. In this regard, the invention also provides a preferred embodiment of the switching device 1 as follows.

Preferably, the switching device 1 comprises a first one-way branch for realizing energy flow from the battery to the energy storage circuit and a second one-way branch for realizing energy flow from the energy storage circuit to the battery, the switch control module 100 and the One or both of a one-way branch and a second one-way branch are connected to control the conduction and disconnection 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 1, as shown in FIG. 3, the switching device 1 may include a second bidirectional switch K4 and a third bidirectional switch K5, and the second bidirectional switch K4 and the third bidirectional switch K5 are connected in reverse series with each other. Forming a first one-way branch and a second one-way branch, the switch control module 100 is respectively connected to the second bidirectional switch K4 and the third bidirectional switch K5 for controlling the second bidirectional switch K4 and the third bidirectional switch K5 Turning on and off to control the turn-on and turn-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 pair when heating is required It can be to switch K5. The implementation of the switching device 1 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 1, as shown in FIG. 5, the switching device 1 may include a first switch K6, a first unidirectional semiconductor component D11, and a second unidirectional semiconductor component D12, a first switch K6 and a first The unidirectional semiconductor elements D11 are connected in series to each other to form a first unidirectional branch, and the second unidirectional semiconductor element D12 constitutes a second unidirectional branch, and the switch control module 100 is connected to the first switch K6 for controlling the first switch The turn-on and turn-off of K6 controls the turn-on and turn-off of the first one-way branch. In the switching device 1 shown in Fig. 5, 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 1 as shown in Fig. 5, 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. 6, the switching device 1 may further include a second switch K7 located in the second one-way branch, the second switch K7 and the second single The semiconductor control unit 100 is also connected in series with the second switch K7 for controlling the on and off of the second one-way branch by controlling the on and off of the second switch K7. Thus, in the switching device 1 shown in FIG. 6, 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. .

Preferably, the switching device 1 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 battery heating circuit to prevent damage to the battery caused by excessive current in the circuit. For example, a resistor R6 connected in series with the second bidirectional switch K4 and the third bidirectional switch K5 may be added to the switching device 1 shown in FIG. 3 to obtain another implementation of the switching device 1, as shown in FIG. An embodiment of the switching device 1 is also shown in Fig. 7, which is The two unidirectional branches in the switching device 1 shown in Fig. 6 are obtained by connecting a resistor R2 and a resistor R3, respectively.

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 plurality of switch devices 1 to be turned on simultaneously or sequentially, and the battery E and the energy storage circuit are connected in series to form a loop, and the battery E pairs the respective charge memory elements C1. Charging is performed. When the current in the loop passes through the current peak and the positive direction is zero, the charge memory element C1 starts to discharge, and the current flows from the charge memory 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 above charging and discharging process can be 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 charge memory element C1 does not completely flow back to the battery E, but some energy remains in the charge memory element C1, ultimately The voltage of the charge memory element C1 is close to or equal to the battery voltage, so that the energy flow from the battery E to the charge memory element C1 cannot be performed, which is disadvantageous for the loop operation of the heating circuit. Therefore, after the switching device 1 is turned on and off again, the present invention uses the polarity inversion unit 101 to invert the voltage polarity of the charge memory element C1, and the voltage of the charge memory element C1 after polarity inversion can be compared with the voltage of the battery E. The series addition is performed, and when the switching device 1 is turned on again, the discharge current in the heating circuit can be increased. 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 only the forward current flow is required to be turned off, the implementation of the switching device 1 shown in, for example, FIGS. 2 and 5 is selected. The form can be used. If both forward current and reverse current need to be turned off, it is necessary to select two unidirectional branch controllable switching devices as shown in Fig. 4, Fig. 6, and Fig. 7. . 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 the switch device 1 is turned off, so that the loop efficiency is high, and the current in the loop is zero and then turned off. The switching device 1 has less influence on the entire circuit.

As an embodiment of the polarity inversion unit 101, the polarity inversion unit 101 includes a plurality of inversion circuits, and the plurality of inversion circuits are connected in one-to-one correspondence with the plurality of charge memory elements C1, wherein as shown in FIG. 8, each The inverting circuit includes a unidirectional switch 3 and a second current memory element L2 connected in series with each other, and the switch control module 100 is further connected to the unidirectional switch 3 for controlling the unidirectional switch 3 to conduct the plurality of charge storage elements C1. The voltage polarity is reversed, and the inversion may be performed simultaneously for a plurality of charge storage elements C1, or may be performed in order.

As another embodiment of the polarity inversion unit 101, as shown in FIG. 9, the polarity inversion unit 101 includes a plurality of one-way switches 3 and one second current memory element L2, one end of the plurality of one-way switches 3 Corresponding to one end connected to the plurality of charge memory elements C1, the other end of the plurality of unidirectional switches 3 is connected to one end of the second current memory element L2, and the other end of the second current memory element L2 is connected to the plurality of charge memory elements C1 At the other end, the switch control module 100 is also connected to the unidirectional switch 3 for simultaneously or sequentially inverting the voltage polarities of the plurality of charge storage elements C1 by controlling the conduction of the unidirectional switch 3. In this embodiment, the polarity inversion process for the plurality of charge storage elements C1 can be implemented using only one second current memory element L2, saving the number of elements, and, preferably, the switch control module 100 is controlled. The on-time of the plurality of unidirectional switches 3 sequentially inverts the voltage polarities of the plurality of charge storage elements C1. In this manner, since the polarities of the plurality of charge storage elements C1 are not simultaneously inverted, it is more advantageous to reduce Small polarity inversion unit 101 The volume of the second current storage element L2 required in the middle is advantageously reduced in size and weight of the battery heating circuit.

Wherein, the unidirectional switch 3 can adopt any component capable of implementing on-off control of the unidirectional path. For example, the unidirectional switch 3 may adopt a configuration as shown in FIG. 10, that is, the unidirectional switch 3 may include a unidirectional semiconductor element D1 and a switch K2 which are connected in series with each other. The plurality of unidirectional switches may be implemented by using unidirectional semiconductor components and switches connected in series with each other; or a common switch may be used, for example, one end of a plurality of unidirectional semiconductor components are connected in series to one end of the same switch, and a plurality of The other end of the unidirectional semiconductor component is respectively connected to a plurality of charge memory components, and the other end of the switch is connected to the current memory component, which can reduce the number of switches in the heating circuit; or a common unidirectional semiconductor component can be used. Form, for example, connecting one end of the plurality of switches to one end of one unidirectional semiconductor component, the other ends of the plurality of switches are respectively connected to the plurality of charge memory elements, and the other end of the unidirectional semiconductor component is connected to the current memory component, The form can reduce the number of unidirectional semiconductor components in the heating circuit. The present invention does not limit the implementation of the unidirectional switch 3 of the polarity inversion unit 101 in the heating circuit as long as the control of the polarity inversion process for a plurality of charge memory elements can be realized.

The operation mode of the embodiment of the heating circuit of the battery E will be briefly described below with reference to FIGS. 11 to 14 , wherein FIG. 11 , FIG. 13 and FIG. 14 show various embodiments of the heating circuit of the battery E, Fig. 12 is a view showing a corresponding waveform diagram of the heating circuit of the battery E in Fig. 11. It should be noted that although the features and elements of the present invention are described with reference to FIG. 11 , FIG. 13 , and FIG. 14 in a specific combination, each feature or element can be used alone without other features and elements. , 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 11th, 13th Figure, the implementation shown in Figure 14. The portion of the grid in the waveform diagram shown in Fig. 12 indicates 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 can be adjusted as needed.

In the heating circuit of the battery E as shown in Fig. 11, the switching device 1 uses a bidirectional switch form (i.e., bidirectional switches K1a and K1b), and the bidirectional switch K1a and the charge memory element C1a are connected in series to form a first branch, and the bidirectional switch K1b and The charge memory element C1b is connected in series to form a second branch, and both branches are connected in series with the first current memory element L1, the damping element R1 and the battery E, respectively. The polarity inversion unit 101 takes the form of a shared second current memory element L2, and the unidirectional semiconductor element D1a and the switch K2a and the unidirectional semiconductor element D1b and the switch K2b respectively constitute two unidirectional switches 3 for controlling the charge memory element respectively The polarity reversal process of C1a and C1b. The switch control module 100 can control the turning on and off of K1a, K1b, K2a, and K2b. Fig. 12 is a view showing a current IC1a flowing through the charge storage element C1a, a voltage VC1a of the charge storage element C1a, a current IC1b flowing through the charge storage element C1b, and a voltage VC1b of the charge storage element C1b of the heating circuit shown in Fig. 11. The waveform diagram, the heating circuit shown in Fig. 11 can be operated as follows: a) The switch control module 100 controls the bidirectional switches K1a, K1b to be turned on, as in the t1 period shown in Fig. 12, the battery E passes through the two-way a circuit composed of the switch K1a, the charge memory element C1a, and a circuit composed of the bidirectional switch K1b and the charge memory element C1b are forward-discharged (as shown by the positive half cycle of the current IC1a, IC1b in the t1 period in FIG. 12) and Reverse charging (as shown by the negative half cycle of the current IC1a, IC1b in the t1 period in FIG. 12); b) the switch control module 100 controls the bidirectional switches K1a, K1b to be turned off when the reverse current is zero; The switch control module 100 controls the switch K2b to be turned on, and the charge memory element C1b The circuit composed of the unidirectional semiconductor element D1b, the second current memory element L2, and the switch K2b is discharged, and the purpose of voltage polarity reversal is achieved. Thereafter, the switch control module 100 controls the switch K2b to be turned off, as in the t2 in FIG. The time period is shown; d) the switch control module 100 controls the switch K2a to be turned on, and the charge memory element C1a is discharged through the loop formed by the unidirectional semiconductor element D1a, the second current memory element L2, and the switch K2a, and achieves the purpose of reversing the voltage polarity. Then, the switch control module 100 controls the switch K2a to be turned off, as shown in the t3 time period in FIG. 12; e) repeating steps a) to d), the battery E is continuously heated by charging and discharging until the battery E reaches the stop. Heating conditions up to now.

In the heating circuit of the battery E as shown in Fig. 13, the switching device 1 still adopts the bidirectional switch form (i.e., the bidirectional switches K1a and K1b) as shown in Fig. 11, and the bidirectional switch K1a is connected in series with the charge memory element C1a to constitute the first The branch, the bidirectional switch K1b and the charge memory element C1b are connected in series to form a second branch, and the two branches are respectively connected in series with the first current memory element L1, the damping element R1 and the battery E. The polarity inversion unit 101 still adopts a form in which the second current memory element L2 is shared. Unlike the polarity inversion unit in FIG. 11, the unidirectional semiconductor element D1a and the switches K2a and K2b are used in FIG. a one-way switch in the polarity inversion unit, one end of the switch K2a and the switch K2b is connected to one end of the unidirectional semiconductor element D1a, the other end is connected to the charge memory elements C1a and C1b, respectively, and the other end of the unidirectional semiconductor element D1a is connected to the Two current memory elements L2. The switch control module 100 can control the on and off of K1a, K1b, K2a, and K2b to control the operation of the entire heating circuit. The heating circuit of the battery E as shown in FIG. 13 is slightly different from the heating circuit shown in FIG. 11 in that the specific circuit structure of the one-way switch in the polarity inversion unit 101 is slightly different, and the operation process is basically similar. This will not be repeated here.

In the heating circuit of the battery E as shown in Fig. 14, the switching device 1 still adopts the bidirectional switch form (i.e., the bidirectional switches K1a and K1b) as shown in Fig. 11, and the bidirectional switch K1a is connected in series with the charge memory element C1a to constitute the first The branch, the bidirectional switch K1b and the charge memory element C1b are connected in series to form a second branch, and the two branches are respectively connected in series with the first current memory element L1, the damping element R1 and the battery E. The polarity inversion unit 101 still adopts a form in which the second current memory element L2 is shared. Unlike the polarity inversion unit in FIG. 11, the unidirectional semiconductor element D1a and the unidirectional semiconductor element D1b are employed in FIG. The switch K2a serves as a one-way switch in the polarity inversion unit, one end of the unidirectional semiconductor element D1a and the unidirectional semiconductor element D1b is connected to one end of the switch K2a, and the other ends of the unidirectional semiconductor element D1a and the unidirectional semiconductor element D1b are respectively connected To the charge storage elements C1a and C1b, the other end of the switch K2a is connected to the second current memory element L2. The switch control module 100 can control the on and off of K1a, K1b, and K2a to control the operation of the entire heating circuit. When the heating circuit shown in Fig. 14 is in operation, the bidirectional switch K1a can be controlled to be turned on, so that the battery E is charged and discharged through the branch where the charge memory element C1 is located, and then the bidirectional switch K1a is controlled to be turned off, and the control switch K2a is turned on. After performing polarity inversion on the charge memory element C1a to complete the polarity inversion of the charge memory element C1, the control switch K2a is turned off; subsequently, the bidirectional switch K1b can be controlled to be turned on, so that the battery E passes through the branch where the charge memory element C1b is located. The circuit performs a charging and discharging process, and then controls the bidirectional switch K1b to be turned off, and the control switch K2a is turned on to reverse the polarity of the charge storage element C1b, and after the polarity inversion of the charge storage element C1b is completed, the control switch K2a is turned off. This is repeated until the battery heating condition is reached.

The heating circuit provided by the invention can improve the charging and discharging performance of the battery, and in the heating circuit, the energy storage circuit and the switching device are connected in series with the battery, and when the battery is heated, the switching device can be avoided due to the existence of the series of charge memory elements. Safety caused by failure short circuit Problem, can effectively protect the battery. At the same time, the polarity reversing unit is further provided in the heating circuit of the present invention. When the switching device is turned off, the polarity reversing unit can invert the polarity of the charge storage element in the tank circuit, due to the charge after polarity inversion. The voltage of the memory element can be added in series with the voltage of the battery, and when the next control switch device is turned on, the discharge current in the heating circuit can be increased, thereby improving the operating efficiency of the heating circuit. Moreover, in the preferred embodiment of the present invention, a single inductor is used to perform polarity inversion, which saves the number of components and is advantageous for reducing the volume and weight of the heating circuit 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.

1‧‧‧Switching device

100‧‧‧Switch Control Module

101‧‧‧Polar reversal unit

C1‧‧‧ Charge Memory Element

E‧‧‧Battery

L1‧‧‧First Current Memory Element

R1‧‧‧damage element

Claims (12)

A heating circuit for a battery, the heating circuit comprising: a plurality of switching devices; a damping element; a storage circuit for connecting to a battery, the energy storage circuit comprising a first current memory element and a plurality of charges a memory element, wherein the plurality of charge memory elements are connected in series with the plurality of switching devices in a one-to-one correspondence to form a plurality of branches, the plurality of branches being connected in parallel with each other and the first current memory element and the damping element a switch control module, the switch control module being coupled to the switch device for controlling the switch device to be turned on and off, such that when the switch device is turned on, energy is in the battery and the a reciprocating flow between the energy storage circuits; and a polarity inversion unit connected to the energy storage circuit for pairing the plurality of charge memory elements when the switching device is turned on and then turned off The polarity of the voltage is reversed. The heating circuit of the battery of claim 1, wherein the polarity inversion unit comprises: a plurality of inverting circuits, and the plurality of inverting circuits are connected to the plurality of the charge memory elements in a one-to-one correspondence Each of the inverting circuits includes a unidirectional switch and a second current memory element connected in series with each other, and the switch control module is further connected to the one-way switch for controlling the one-way switch to be turned on. The voltage polarity of the charge storage elements is reversed. The heating circuit of the battery of claim 1, wherein the polarity inversion unit comprises: a plurality of one-way switches and one second current memory element, one end of the plurality of one-way switches being connected to one end of the plurality of charge memory elements in a one-to-one correspondence, and the other ends of the plurality of the one-way switches are connected to the other end One end of the second current memory element, the other end of the second current memory element is connected to the other end of the plurality of charge memory elements, and the switch control module is further connected to the one-way switch for passing The unidirectional switch is controlled to be turned on to simultaneously or sequentially reverse the voltage polarities of the plurality of charge storage elements. The heating circuit of claim 1, wherein the switching device is a first bidirectional switch. 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 The storage circuit is connected to the second one-way branch of the battery, wherein the switch control module is respectively connected to one or both of the first one-way branch and the second one-way branch, Used to control the turn-on and turn-off of the connected branch. The heating circuit of claim 5, wherein the switching device comprises: a second bidirectional switch; and a third bidirectional switch, wherein the second bidirectional switch and the third bidirectional switch are reversely connected in series to each other The first one-way branch and the second one-way branch, wherein the switch control module is respectively connected to the second bidirectional switch and the third bidirectional switch, for controlling the second bidirectional switch and the second The three bidirectional switches are turned on and off to control the turning on and off of the first one-way branch and the second one-way branch. The heating circuit of claim 5, wherein the switching device comprises: a first switch; a first unidirectional semiconductor element, the first switch and the first unidirectional semiconductor element being connected in series to each other to constitute the first unidirectional branch; and a second unidirectional semiconductor element, the second unidirectional semiconductor element constituting a second one-way branch, the switch control module is connected to the first switch, and is configured to control on and off of the first one-way branch by controlling on and off of the first switch Broken. The heating circuit of the battery of claim 7, wherein the switching device further comprises: a second switch located in the second one-way branch, the second switch and the second single The semiconductor component is connected in series, and the switch control module is further connected to the second switch for controlling the on and off of the second one-way branch by controlling the on and off of the second switch. The heating circuit of the battery of claim 5, wherein the switching device further comprises a resistor in series with the first one-way branch and/or the second one-way branch. The heating circuit of the battery according to any one of claims 1 to 9, wherein the switch control module has zero current flowing through the switching device after the switching device is turned on or After zero, the switching device is controlled to be turned off. The heating circuit of claim 1, wherein the switch control module controls a plurality of the switching devices such that energy flows from the battery simultaneously or sequentially to the respective charge storage elements and energy is simultaneously from the respective charge storage elements. Or flow to the battery in sequence. The heating circuit of the battery 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.