KR20200054760A - Apparutus for heating battery and battery pack comprising the same - Google Patents

Abstract

According to the present invention, a battery heating device includes: a coil which is accommodated in a housing that accommodates a battery cell and wound around at least a portion of the battery cell; and a processor which conducts or blocks the alternating current flowing through the coil based on a cell temperature of the battery cell. When the cell temperature is less than a reference cell temperature, the processor can conduct an alternating current flowing through the coil so that an induced current flows through the battery cell to heat the battery cell.

Description

A battery heating device and a battery pack comprising the same {Apparutus for heating battery and battery pack comprising the same}

The present invention relates to a battery heating device and a battery pack including the same, and more specifically, by placing a coil in a housing for housing the battery cell, and the arranged coil to induce an electric current flowing in the battery cell, the battery cell is high speed It relates to a battery heating device for heating and a battery pack comprising the same.

In recent years, as the demand for portable electronic products such as laptops, video cameras, and portable telephones has rapidly increased, and the development of storage batteries, robots, satellites, etc. for energy storage has started in earnest, it has become possible for high-performance secondary batteries that can be repeatedly charged and discharged. Korean studies are being actively conducted.

Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are free of charge and discharge because they have little memory effect compared to nickel-based secondary batteries, Self-discharge rate is very low and it is spotlighted due to advantages such as high energy density.

The secondary battery has an optimal operating temperature range, and for example, there is a problem in that output is lowered and a required voltage and current are not output in a low temperature state of 0 ° C or lower.

 In order to cope with such a problem, a technique of heating a secondary battery using air heated using a heating air conditioning apparatus is used, but there is a problem in that power consumption is high in heating air due to low thermal efficiency of heating.

Accordingly, there is a need for a battery heating technology that heats a secondary battery at a low temperature with high efficiency and high speed.

An object of the present invention is to provide a battery heating device and a battery pack including the same, by allowing an induction current to flow through a battery cell in a low temperature state without using a heating resistor or a heating and air conditioning device. have.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned can be understood by the following description, and will be more clearly understood by embodiments of the present invention. In addition, it will be readily appreciated that the objects and advantages of the present invention can be realized by means of the appended claims and combinations thereof.

The battery heating apparatus according to the present invention for solving the above technical problem is a coil which is accommodated in a housing for housing a battery cell and wound around at least a portion of the battery cell; And a processor that energizes or blocks the alternating current flowing through the coil based on the cell temperature of the battery cell.

Preferably, when the cell temperature is less than the reference cell temperature, the processor may conduct an alternating current flowing through the coil so that an induced current flows through the battery cell to heat the battery cell.

Preferably, the coil may be wound on the outer circumferential surface or outer circumference of the battery cell.

Preferably, the housing is formed with a coil induction groove inside, and the coil can be coupled to the coil induction groove.

Preferably, the coil can be wound so as to face the outer surface of the battery cell.

Preferably, the housing is formed with a coil holder for fixing the coil on the inner surface, and the coil can be fitted into the coil holder.

Preferably, the coil can be wound between the positive electrode and the negative electrode of the battery cell.

Preferably, the processor may control the output of the AC current source of the AC current so that the frequency of the AC current increases or decreases in response to the cell temperature.

Preferably, the processor may control the AC current source of the AC current so that the frequency of the AC current increases or decreases in response to the cell temperature.

The battery pack according to the present invention may include the battery heating device.

The vehicle according to the present invention may include the battery heating device.

According to the present invention, the AC cell is energized in a coil accommodated in a housing housing a battery cell and wound around at least a portion of the battery cell, thereby rapidly heating the battery cell through induction heating to prevent deterioration of the battery cell due to low temperature. can do.

1 is a view showing a connection configuration of a battery heating device and a battery pack including the same according to the present invention.
2 is a view for explaining a winding structure in which the coil of the battery heating device according to an embodiment of the present invention is wound around a battery cell.
3 is a view for explaining a coil induction groove formed in a housing according to an embodiment of the present invention.
4 is a view for explaining a winding structure in which the coil of the battery heating device according to another embodiment of the present invention is wound on one side of a battery cell.
5 is a view for explaining the coil holder formed in the housing according to another embodiment of the present invention.
6 is a view for explaining a coiling structure in which the coil of the battery heating device according to another embodiment of the present invention is wound inside a battery cell.

The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, and accordingly, a person skilled in the art to which the present invention pertains can easily implement the technical spirit of the present invention. In the description of the present invention, when it is determined that detailed descriptions of known technologies related to the present invention may unnecessarily obscure the subject matter of the present invention, detailed descriptions will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings are used to indicate the same or similar components.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a view showing a connection configuration of a battery heating device according to the present invention and a battery pack including the same, and FIG. 2 illustrates a winding structure in which the coil of the battery heating device according to an embodiment of the present invention is wound around a battery cell 3 is a view for explaining a coil induction groove formed in a housing according to an embodiment of the present invention.

 1 and 2, the battery pack 10 according to the present invention may include a battery heating device 100 and a battery cell 11. In addition, the battery pack 10 receives an AC current from the charger 20, converts it into DC current, and outputs it to the battery cell 11, the converter 12, receives the DC current from the battery cell 11, and converts it into AC current. It may further include an inverter 13 to convert and output to the motor (30).

That is, the battery pack 10 according to the present invention may be included in a vehicle driven through electrical energy to supply power for driving the motor 30 or to receive power from an external charger 20 to be charged.

The battery heating apparatus 100 according to an embodiment of the present invention may include a coil 110, a first switch 121, a second switch 122, a sensing unit 130 and a processor 140. In addition, the battery heating device 100 may further include a housing 111.

The coil 110 may be accommodated in a housing 111 accommodating the battery cell 11 and wound around at least a portion of the battery cell 11.

As illustrated in FIG. 2, the coil 110 may be accommodated in the housing 111 together with the battery cell 11 and wound on an outer circumferential surface or outer periphery of the battery cell 11. More specifically, when the shape of the battery cell 11 is a rectangular parallelepiped, the coil 110 is wound around the outer circumferential surface of the battery cell 11, and when the shape of the battery cell 11 is cylindrical, the coil 110 is a battery It may be wound around the outer periphery of the cell 11.

As shown in FIG. 3, the housing 111 may have a coil induction groove 111a formed therein so that the coil 110 is wound and fixed to the battery cell 11. The coil 110 may be fitted to the coil induction groove 111a to be fixed and accommodated inside the housing 111.

By this winding method, the coil 210 is uniformly arranged along the coil induction groove 111a formed inside the housing 111 and may not be easily separated from the housing 111.

Meanwhile, FIGS. 1 to 3 illustrate that one battery cell 11 is included in the battery pack 10, but a plurality of battery cells may be included in the battery pack 10. Accordingly, when a plurality of battery cells are included in the battery pack 10, the coil 110 may be wound for each of the plurality of battery cells. In addition, each of the plurality of battery cells is housed in the housing 111, and the coil 110 can also be stored and fixed in each housing 111.

Alternatively, a plurality of battery cells are accommodated in one housing 111 so that they are in close contact with each other, and one coil 110 may be wound around the entire plurality of battery cells.

Meanwhile, as shown in FIGS. 1 and 2, the coil 110 is electrically connected to each of the charger 20 and the motor 30 to receive AC current from the charger 20 and the motor 30. . That is, the coil 110 may receive an AC current from the charger 20 or the motor 30, which is an AC current source outputting AC current.

Accordingly, an alternating current flows through the coil 110, and an induced current flows through the conductor included in the battery cell 11 to be wound, so that the battery cell 11 can be heated.

At this time, the conductor included in the battery cell 11 may be a conductive pouch located at the outermost side of the battery cell 11.

The first switch 121 may change the operating state in response to the control signal output from the processor 140, thereby turning on or off the AC current flowing from the charger 20 to the coil 110.

Specifically, the first switch 121 may energize an alternating current flowing from the charger 20 to the coil 110 when the operating state is changed to a turn-on state, and when the operating state is changed to a turn-off state, the charger 20 ) Can block the alternating current flowing from the coil 110.

The second switch 122 may change the operating state in response to the control signal output from the processor 140, thereby turning on or off the AC current flowing from the motor 30 to the coil 110.

Specifically, the second switch 122 may energize the alternating current flowing from the motor 30 to the coil 110 when the operating state is changed to a turn-on state, and when the operating state is changed to a turn-off state, the motor 30 ) Can block the alternating current flowing from the coil 110.

The sensing unit 130 may measure the cell temperature of the battery cell 11. That is, the sensing unit 130 may be positioned around the battery cell 11 or in close contact with one side of the battery cell 11 to measure the cell temperature. The sensing unit 130 outputs a temperature signal indicating the cell temperature to the processor 140, and the processor 140 converts the temperature signal into a digital signal to be used in the process of heating the battery cell 11.

To this end, the sensing unit 130 may be provided with a temperature sensor.

The processor 140 may conduct or block AC current flowing through the coil 110 based on the cell temperature of the battery cell 11. Specifically, the processor 140 determines whether the cell temperature is less than the reference cell temperature, and when the determination result shows that the cell temperature is less than the reference cell temperature, controls the operating state of the first switch 121 or the second switch 122 The AC current flowing through the coil 110 may be energized.

Here, the reference cell temperature may be a temperature at which the battery cell 11 begins to deteriorate due to low temperature. For example, the reference cell temperature may be 0 ° C.

When the battery cell 11 is being charged by receiving power from the charger 20 or is electrically connected to the charger 20, the processor 140 operates when the cell temperature is less than the reference cell temperature. Can be turned on. Accordingly, an alternating current flows from the charger 20 to the coil 110, so that the induced current flows to the battery cell 11 and the battery cell 11 may be heated.

In addition, when the battery cell 11 is being charged by receiving power from the motor 30, the processor 140 controls the operating state of the second switch 122 to a turn-on state when the cell temperature is less than a reference cell temperature. Can be. Accordingly, an alternating current flows from the motor 30 to the coil 110, so that the induced current flows to the battery cell 11 and the battery cell 11 may be heated.

Meanwhile, the processor 140 may control the charger 20 and the motor 30, which are AC current sources of the AC current, so that the frequency of the AC current increases or decreases in response to the cell temperature. Specifically, the processor 140 may set the maximum cell temperature from the reference cell temperature to a plurality of temperature sections, and set the frequency of the alternating current for each temperature section differently.

Using this, the processor 140 controls the charger 20 and the motor 30 so that the alternating current output from the charger 20 and the motor 30 is output at a frequency corresponding to a temperature section including the current cell temperature. can do.

For example, as shown in Table 1 below, the reference cell temperature, the maximum cell temperature, the temperature section, and the frequency of the AC current for each temperature section may be set.

Reference cell temperature 0 ℃ Max cell temperature 20 ℃ 1st temperature section (0 ℃ -10 ℃) Set frequency 200 kHz Second temperature section (0 ℃ to 10 ℃) Set frequency 100 kHz

At this time, the processor 140, when the cell temperature is included in the first temperature range, the charger 20 and the frequency of the alternating current output from the charger 20 and the motor 30 is 200 kHz, which is the frequency set in the first temperature range, and The motor 30 can be controlled.

Subsequently, when the cell temperature is increased and included in the second temperature section, the processor 140 generates a charger 20 such that the frequency of the alternating current output from the charger 20 and the motor 30 becomes 100 kHz, which is the frequency set in the second temperature section. ) And the motor 30 can be controlled.

Finally, when the cell temperature reaches the maximum cell temperature, the processor 140 controls the operating states of the first switch 121 and the second switch 122 to be turned off so that AC current does not flow through the coil 110. can do.

4 is a view for explaining a winding structure in which the coil of the battery heating apparatus according to another embodiment of the present invention is wound on one side of a battery cell, and FIG. 5 illustrates a coil holder formed in a housing according to another embodiment of the present invention It is a drawing for doing.

4 and 5, the coil 110 'and the housing 111' of the battery heating apparatus 100 according to another embodiment are the coil 110 and the housing ( 111) Since only the coiling target and the coil fixing configuration are different, repeated description will be omitted.

The coil 110 ′ of the battery heating device 100 according to another embodiment may be wound to face the outer surface of the battery cell 11. Specifically, the coil 110 'may be wound without a winding object inserted therein. In addition, one side of the coil 110 ′ may be faced to the outer surface of the battery cell 11 in a wound state.

At this time, in the housing 111 ', the coil holder 111a' for fixing the coil 110 'so as to face the outer surface of the battery cell 11 in a state where the coil 110' is wound may be formed on the inner surface. have.

The coil holder 111a 'is fitted in all directions of the circular coil 110' in a hook shape to fix the coil 110 'on the inner surface of the housing 111'.

Through this, the coil 110 'may induce an induction current to flow on any one of the outer surfaces of the battery cell 11, thereby heating the outer surfaces.

According to the configuration of the present invention, by intensively heating only the outer surface more frequently exposed to the low temperature environment among the outer surfaces of the battery cell 11, the cell temperature of the battery cell 11 can be managed with high efficiency.

6 is a view for explaining a winding structure in which the coil of the battery heating device according to another embodiment of the present invention is wound inside a battery cell.

Referring to FIG. 6, the coil 110 ″ of the battery heating apparatus 100 according to another embodiment differs only from a coiling target and a receiving position compared to the coil 110 of the battery heating apparatus 100 according to an embodiment. Because it is only, repeated description will be omitted.

The coil 110 "of the battery heating apparatus 100 according to another embodiment is located inside the battery cell 11 and can be wound between the positive electrode (+) and the negative electrode (-) of the battery cell (11). Specifically, the coil 110 "may be wound without a winding object inserted therein, and may face each of the positive electrode (+) and the negative electrode (-) in the wound state.

At this time, the coil 110 "may be stored together with the positive electrode (+) and the negative electrode (-) in the pouch of the battery cell 11 in a state wound between the positive electrode (+) and the negative electrode (-). .

Through this, the coil 110 "heats the positive electrode (+) and the negative electrode (-) by causing an induction current to flow in each of the positive electrode (+) and the negative electrode (-) inside the battery cell 11. I can do it.

According to the configuration of the present invention, by heating from the inside of the battery cell 11, it is possible to effectively prevent deterioration of the battery cell 11 due to low temperature and to rapidly increase the cell temperature.

Meanwhile, the battery pack according to the present invention may further include a case, a cartridge, and a bus bar for accommodating the battery module in addition to the plurality of battery modules. In particular, the battery pack according to the present invention may further include the battery heating device to control the cell temperature of the battery cell.

The battery heating device according to the present invention can be applied to an automobile such as an electric vehicle or a hybrid vehicle. That is, the vehicle according to the present invention may include a battery heating device according to the present invention.

The above-described present invention, the above-described embodiment and the accompanying drawings because it is possible for a person having ordinary knowledge in the technical field to which the present invention belongs, various substitutions, modifications and changes are possible without departing from the technical spirit of the present invention. It is not limited by.

100: battery heating device
110: coil
121: first switch
122: second switch
130: sensing unit
140: processor
10: battery pack
11: battery cell
12: converter
13: inverter
20: charger
30: motor

Claims (10)

A coil accommodated in a housing housing the battery cell and wound around at least a portion of the battery cell; And
It includes a processor for energizing or blocking the alternating current flowing through the coil based on the cell temperature of the battery cell,
The processor
When the cell temperature is less than the reference cell temperature, an alternating current flowing through the coil is energized so that an induced current flows through the battery cell to heat the battery cell.
Battery heating device.
According to claim 1,
The coil
A battery heating device wound around an outer circumferential surface or an outer periphery of the battery cell.
According to claim 2,
The housing
A battery heating device in which a coil induction groove is formed inside and the coil is fitted into the coil induction groove.
According to claim 1,
The coil
A battery heating device wound to face the outer surface of the battery cell.
According to claim 1,
The housing
A battery heating device in which a coil holder for fixing the coil is formed on an inner surface, and the coil is fitted into the coil holder.
According to claim 1,
The coil
A battery heating device wound between an anode electrode and a cathode electrode of the battery cell.
According to claim 1,
The processor
Battery heating device for controlling the output of the alternating current source of the alternating current so that the frequency of the alternating current increases or decreases in response to the cell temperature.
According to claim 1,
The processor
Battery heating device for controlling the AC current source of the AC current so that the frequency of the AC current increases or decreases in response to the cell temperature.
A battery pack comprising the battery heating device according to any one of claims 1 to 8.
A vehicle comprising the battery heating device according to any one of claims 1 to 8.

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