KR102248863B1 - Method and apparatus for controling temperature of a battery pack - Google Patents

Abstract

The present invention relates to a battery pack temperature control method and apparatus, and more specifically, when the battery pack is in a low temperature state, a heat generating unit is driven and a PWM signal having a different duty ratio is output according to the temperature of the driven heat generating unit. It relates to a battery pack temperature control method and apparatus capable of accurately and safely controlling the temperature of the battery pack according to the control.

Description

Battery pack temperature control method and apparatus {METHOD AND APPARATUS FOR CONTROLING TEMPERATURE OF A BATTERY PACK}

The present invention relates to a battery pack temperature control method and apparatus, and more specifically, when the battery pack is in a low temperature state, a heat generating unit is driven and a PWM signal having a different duty ratio is output according to the temperature of the driven heat generating unit. It relates to a battery pack temperature control method and apparatus capable of accurately and safely controlling the temperature of the battery pack according to the control.

A typical battery pack is composed of a rechargeable/dischargeable secondary battery, and such a secondary battery has a configuration comprising a plurality of assemblies including a plurality of unit cells. In addition, the cell is composed of a positive electrode current collector, a separator, an active material, an electrolyte, an aluminum thin film layer, and the like, and charging/discharging of the battery pack is performed by an electrochemical reaction, so that the battery is affected by the ambient temperature condition environment.

If charging/discharging is performed at a low temperature, the viscosity of the electrolyte increases and internal resistance increases, and the movement of lithium ions moving during charging/discharging slows down, resulting in a decrease in the life, stability, and driving performance of the battery pack. Occurs.

In order to solve the problem of lowering the internal temperature of the battery pack, conventionally, a heating part is attached to the Li-ion battery pack to increase the internal temperature of the battery pack.

However, the conventional technology simply attaches the heating component to the battery pack, and when the temperature of the heating component is increased to a value above an appropriate temperature, the temperature of the battery pack does not reach a predetermined appropriate driving temperature, so the driving of the heating component can be stopped. There wasn't. In addition, if this situation persists, the performance of the battery pack deteriorates to a small extent, and dangerous situations such as explosion and ignition may occur.

Therefore, there is a need to develop a technology that enables a safe and stable battery pack to be used even at a low temperature by controlling the heat generated by the heating component so that it does not exceed a predetermined range when the heating component is driven in a low temperature state.

KR 2012-0032218 A

The present invention provides a battery pack temperature control method and apparatus capable of using a safe and stable battery pack by controlling heat generation of a heating component driven at a low temperature.

In the battery pack temperature control method according to an embodiment of the present invention, in the method of controlling the temperature of the battery pack, the battery cell temperature measuring step of periodically measuring the temperature of the battery cell, the battery cell measured in the battery cell temperature measuring step When the temperature of is less than or equal to a preset first reference temperature value, the heating unit switch-on step of turning on the heating unit switch so that the heating unit is driven; , When the temperature of the battery cell measured in the battery cell temperature maintaining step of turning on/off the switch of the heating unit at a predetermined period and the battery cell temperature maintaining step is higher than a preset second reference temperature value, the heating unit switch is turned off. It is configured to include a sub-switch off step.

The battery cell temperature maintenance step includes a heating unit temperature measurement step of measuring a temperature of a heating unit supplied with current from a controlled switch turned on in the heating unit switch-on step, and a temperature of the heating unit measured in the heating unit temperature measurement step. When the measured temperature of the heating part is greater than or equal to a preset third reference temperature value as a result of the comparison result of the heating part temperature comparison step and the heating part temperature comparison step comparing with the set third reference temperature value, an initial with a predetermined initial duty ratio And a pulse modulation (PWM) signal output step of outputting a pulse modulation (PWM) signal as a control signal of the heat generating unit switch.

The predetermined initial duty ratio of the initial pulse modulation (PWM) signal is determined by a preset third reference temperature value.

When the initial pulse modulation (PWM) signal is output in the pulse modulation (PWM) signal output stage and the temperature measured when measuring the temperature of the heating unit is a preset third reference temperature value, the duty ratio of the output pulse modulation (PWM) signal Alternatively, a correction pulse modulated (PWM) signal with a reduced period is output.

A battery pack temperature control apparatus according to an embodiment of the present invention is a temperature control apparatus of a battery pack composed of a plurality of battery cells, a heating unit formed to surround the plurality of battery cells, and turning on/off current supply to the heating unit. And a BMS that outputs a pulse modulated (PWM) signal so that the heating unit switch is controlled on/off according to the temperature of the heating unit switch unit and the heating unit.

The BMS is a battery cell temperature measurement unit that measures the temperature of the battery cell, a heating unit temperature measurement unit that measures the temperature of the heating unit, the temperature measured by the battery cell temperature measurement unit, and the heating unit temperature measurement unit. Including a temperature comparison unit that compares the selected temperature with each reference temperature value, and a pulse modulation (PWM) signal output unit that outputs a pulse modulation (PWM) signal having a predetermined duty ratio according to the comparison result of the temperature comparison unit. It is composed.

The pulse modulation (PWM) signal output unit is a pulse having a predetermined first duty ratio for turning on the heat generating unit switch when the temperature of the battery cell measured by the battery cell temperature measuring unit is less than a preset first reference temperature value. Outputs a modulation (PWM) signal, and when the temperature of the battery cell measured by the battery cell temperature measuring unit is greater than or equal to a preset second reference temperature value, pulse modulation having a predetermined second duty ratio to turn off the heating unit switch (PWM) signal is output.

The BMS is configured to further include an on/off signal output unit for outputting an on/off switching control signal of the heat generating unit switch.

The pulse modulation (PWM) signal output unit generates an initial pulse modulation (PWM) signal having a predetermined initial duty ratio when the temperature of the heating unit measured by the heating unit temperature measuring unit is equal to or higher than a preset third reference temperature value. Output as a control signal of the sub switch.

The predetermined initial duty ratio of the initial pulse modulation (PWM) signal is determined by a preset third reference temperature value.

The BMS is configured to further include a BMS temperature measuring unit that measures temperatures of elements in the BMS.

The battery pack temperature control method and apparatus according to an embodiment of the present invention measure the temperature of the heating part attached to the battery pack and output a PWM signal having a predetermined duty ratio according to the measured temperature to stably and quickly increase the temperature of the battery pack. Can be controlled.

1 is a flow chart of a battery pack temperature control method according to an embodiment of the present invention.
2 is a flowchart of a battery cell temperature maintenance step in a method for controlling a temperature of a battery pack according to an exemplary embodiment of the present invention.
3 is an execution graph of a battery pack temperature control method according to an embodiment of the present invention.
4 is a block diagram of a battery pack temperature control device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the contents described in the accompanying drawings. However, the present invention is not limited or limited by the embodiments. The only embodiments are provided to complete the disclosure of the present invention, and to fully inform the scope of the invention to those of ordinary skill in the art.

In addition, terms including ordinal numbers such as first and second may be used to describe various elements, but the elements are not limited by the terms. These terms are only used for the purpose of identifying one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Terms used in the present invention have selected general terms that are currently widely used as possible while taking functions of the present invention into consideration, but this may vary according to the intention or precedent of a technician working in the field, the emergence of new technologies, and the like. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meaning of the terms will be described in detail in the description of the corresponding invention. Therefore, the terms used in the present invention should be defined based on the meaning of the term and the overall contents of the present invention, not a simple name of the term.

<Example 1>

Next, a battery pack temperature control method according to an embodiment of the present invention will be described.

The battery pack temperature control method of the present invention is a method of stably controlling the temperature of the battery pack by controlling the heat generation of the heating unit using a PWM signal and driving it when the battery cell is in a low temperature state.

1 is a flowchart of a method for controlling a temperature of a battery pack according to an exemplary embodiment of the present invention.

Referring to FIG. 1, in a method for controlling a temperature of a battery pack according to an embodiment of the present invention, a temperature of a battery cell is periodically measured (battery cell temperature measurement step: S110), and the measured temperature of the battery cell is a first reference temperature. When the value is less than the value, the heating unit switch is turned on so that the heating unit is driven (heating unit switch on step: S120).

The temperature of the battery cell is gradually increased by outputting a pulse width modulation (PWM) signal having a respective duty ratio according to the temperature of the heating unit driven in the heating unit switch-on step (S120) (battery cell temperature Maintenance step: S130).

When the temperature of the battery cell measured in the battery cell temperature maintaining step (S130) is greater than or equal to a preset second reference temperature value (S140), the heating unit switch is turned off (the heating unit switch off step: S150), and the battery cell If the temperature of the battery cell heated in the temperature maintaining step (S130) is less than a preset second reference temperature value (S140), the battery cell temperature maintaining step until the temperature of the battery cell reaches a preset second reference temperature value. Repeat (S130).

Here, the proper driving temperature of the battery cell during charging is 0 to 45°C, the proper driving temperature of the battery cell when discharging is -20 to 60°C, and the battery cell must maintain such an appropriate driving temperature. Therefore, the preset first reference temperature value is an appropriate minimum temperature at which the battery cell can be stably driven, and as an example, it is set to 5°C when charging and -10°C when discharging, but is not limited thereto. .

In addition, the preset second reference temperature value is set to 20°C when charging and 10°C when discharging, as an example, so that charging and discharging can be efficiently driven.

In addition, the battery cell temperature maintaining step (S130) will be described in detail with reference to FIG. 2.

2 is a flowchart of a battery cell temperature maintenance step in a method for controlling a temperature of a battery pack according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the temperature of the heating part supplied with current from the controlled switch turned on in the heating part switching on step (S120) is measured (heating part temperature measuring step: S131), and the heating part temperature measuring step (S131). The temperature measured in is compared with a preset third reference temperature value (heating unit temperature comparison step: S132).

When the measured temperature is equal to or greater than a preset third reference temperature value as a result of the comparison of the heating unit temperature comparison step (S132), an initial PWM signal having a predetermined initial duty ratio is output as a control signal of the heating unit switch ( PWM signal output step: S133).

In general, when the battery pack exceeds 68°C, the battery pack expands, and when the temperature of the battery pack is 177°C, an explosion occurs. Accordingly, the preset third reference temperature value is set to 55° C. as an exemplary embodiment to prevent deterioration or explosion of the battery pack due to heat of the heating unit, and this value is not limited thereto.

In addition, the predetermined initial duty ratio of the initial PWM signal is determined by a preset third reference temperature value. If the preset third reference temperature value is greater than 50°C, there is a risk of the battery pack swelling. As this increases, a predetermined initial duty ratio value is set to a small value (approximately 10 to 15%) and a PWM signal is output. If the preset third reference temperature value is less than 50°C, there is little risk of swelling of the battery pack. Therefore, the predetermined initial duty ratio value is set to an intermediate value (approximately 40-50%) to the battery pack. Protects from heat generated by the heating part.

In addition, when the initial PWM signal is output in the PWM signal output step (S133) and the temperature measured when measuring the temperature of the heating unit is still the third reference temperature value, a correction PWM signal that reduces the duty ratio or period of the output PWM signal Output so that the heat of the heating unit can be reduced.

Here, as an exemplary embodiment, the reduced duty ratio is set to decrease by 5%, and the period is set to decrease by 5 ms as an exemplary embodiment, but is not limited thereto.

In addition, such a reduction in duty ratio or period is made gradually. For example, if the duty ratio is set to 40% and output, the temperature of the battery cell is still less than the second reference temperature value, and the temperature of the heating unit is still controlled. 3 In the case of the reference temperature value, the PWM signal is output by reducing from 40% to 35%, and when the temperature of the battery cell measured again is still less than the second reference temperature value and the temperature of the heating part is still the third reference temperature value, 35% Reduce in steps of 5% by reducing from to 30%.

Similarly, if the cycle starts with 40 ms, if the temperature of the battery cell is still less than the second reference temperature value and the temperature of the heating part is still the third reference temperature value, the temperature of the battery cell is reduced from 40 ms to 35 ms, and the measured temperature of the battery cell again. If is still less than the second reference temperature value and the temperature of the heating part is still the third reference temperature value, it is gradually reduced by 5ms by reducing it from 35ms to 30ms.

Accordingly, by outputting such a correction PWM signal, the temperature of the battery cell can be increased while reducing the temperature of the heating unit.

Meanwhile, the performance of the battery pack temperature control method according to the temperature of the battery cell will be described in detail below with reference to FIG. 3.

3 is an execution graph of a method for controlling temperature of a battery pack according to an exemplary embodiment of the present invention.

Referring to FIG. 3, section 1 is a section below the first reference temperature value, and since it is a section in which performance of the battery cell may be degraded, the heating unit needs to be driven.

Sections 2 and 3 are sections in which the battery cells are normally driven.

(1) If the temperature of the battery cell is ①, the heating unit is driven, and even when the temperature of the battery cell becomes ② due to the driven heating unit, the heating unit is continuously driven.

When the temperature of the battery cell becomes ③ due to the driven heating unit, the driven heating unit is stopped because the temperature of the battery cell is a normal temperature.

(2) If the temperature of the battery cells that are periodically measured after the driving of the heating unit is stopped is ④ and ⑤, the temperature of the battery cell is normal, so the driving of the heating unit is not performed.

When the first and second reference temperature values are used, when the battery pack is in a low temperature state, it can be maintained for a certain period of time without continuous driving of the heating unit.

In addition, in the above embodiment, the temperature of the battery pack is rapidly increased by allowing the entire current to flow to the heating unit, and when the temperature of the heating unit reaches a preset third reference temperature value in the middle, the current is reduced to lower the temperature of the heating unit. It's a way to keep the battery pack warm while still being heated.

However, this method may cause a sudden temperature increase in the heating unit, and the temperature of the heating unit may not be rapidly decreased, so that the temperature of the battery cell can be gradually increased by using a method of applying controlled heat from the beginning.

When the temperature of the battery cell, which is periodically measured, is less than or equal to a preset first reference temperature value, an initial PWM signal having a predetermined initial duty ratio is output as a switching control signal of a heat generating unit switch driving the heat generating unit.

Here, as an example, the predetermined initial duty ratio is set to 10%.

In addition, when the temperature of the battery cell, which is periodically measured, is still less than or equal to a preset first reference temperature value, the temperature of the heating unit is measured. When the measured temperature of the heating unit is less than a preset third reference temperature value, a correction PWM signal obtained by increasing the duty ratio or period of the initial PWM signal is output.

Measuring the temperature of the battery cell and the heating unit until the battery cell is a preset second reference temperature value or the heating unit becomes a preset third reference temperature value, and outputting a correction PWM signal with an increased duty ratio or period. Repeat the method.

Here, if the temperature of the battery cell is still below the preset first reference temperature value, but the temperature of the heating unit is higher than the preset third reference temperature value, the PWM signal output is stopped to stop the driving of the heating unit from the beginning. Allows the additional to be driven.

Here, the preset third reference temperature value is generally set to 45° C. since swelling occurs when the battery pack exceeds 68° C., so that the temperature of the battery cell can be increased more safely than the above embodiment. do.

In addition, in order to increase the current, the duty ratio of the PWM signal must be increased or the period must be increased, so the duty ratio is increased by 3% as an example, and the period is set to increase by 3 ms as an example, but limited to this. It doesn't work.

Such an increase in duty ratio or period is made gradually. For example, if the duty ratio starts at 10%, the measured temperature of the battery cell is still less than the second reference temperature value, and the temperature of the heating part is the third reference temperature. In the case of a temperature value, increase it from 10% to 13%, and increase it from 13% to 16% when the temperature of the battery cell measured again is still less than the second reference temperature value and the temperature of the heating part is still the third reference temperature value. Increase in 3% increments.

Similarly, if the cycle starts with 10 ms, if the temperature of the battery cell still measured is still less than the second reference temperature value and the temperature of the heating part is the third reference temperature value, increase it from 10 ms to 13 ms, and measure the battery cell again. When the temperature of is still less than the second reference temperature value and the temperature of the heating part is still the third reference temperature value, it is increased in steps of 3 ms by increasing the temperature from 13 ms to 16 ms.

<Example 2>

Next, a battery pack temperature control apparatus according to an embodiment of the present invention will be described.

The battery pack temperature control apparatus of the present invention enables the temperature control of the battery pack to be stably and safely using a PWM signal for switching on/off the attached heating unit when the battery pack is low temperature.

4 is a block diagram of a battery pack temperature control apparatus according to an embodiment of the present invention.

Referring to FIG. 4, the battery pack temperature control apparatus 300 according to an exemplary embodiment of the present invention includes a plurality of battery cells 320 and formed to surround the battery cells 320. It includes a heating unit switch 340 for turning on/off the current supply to 330 and a BMS 310 outputting a PWM signal so that the heating unit switch 340 is controlled on/off according to the temperature of the heating unit.

Here, the heating unit 330 is configured using a pad, a heating wire, a liquid heater, or a metal heater, and is configured to surround and attach to the upper, lower, upper and lower portions of the battery cell 320, or on the side of the cell.

In addition, the BMS 310 that controls the driving of the heating unit 330 will be described in more detail below.

The BMS 310 includes a battery cell temperature measurement unit 311 for measuring the temperature of the battery cell 320, a heating unit temperature measurement unit 312 for measuring the temperature of the heating unit 330, and a battery cell temperature measurement. According to the comparison result of the temperature comparison unit 313 and the temperature comparison unit 313 comparing the temperature measured by the unit 311 and the temperature measured by the heating unit temperature measurement unit 312 with different reference temperature values, It is configured to include a PWM signal output unit 314 for outputting a PWM signal having a duty ratio of.

Strictly speaking, the battery cell temperature measuring unit 311 and the heating unit temperature measuring unit 312 are configured to command the temperature to be measured in each configuration.

Each of the battery cells 320 and the heating unit 330 attaches a temperature sensor and transmits the temperature sensed by the temperature sensor to the corresponding temperature measurement unit according to a command of each temperature measurement unit.

In addition, the BMS 310 is configured to additionally include a BMS temperature measuring unit that mounts a temperature sensor therein so that the temperature of elements in the BMS 310 can also be sensed. This configuration replaces the battery cell temperature measuring unit 311 or is added to the existing configuration to increase the accuracy of battery pack temperature control.

Further, in more detail, when the temperature measured by the battery cell temperature measuring unit 311 is less than or equal to a preset first reference temperature value, the PWM signal output unit 314 is configured to turn on the heating unit switch 340. When a PWM signal having a first duty ratio of is output and the temperature measured by the battery cell temperature measuring unit 311 is equal to or higher than a preset second reference temperature value, a predetermined agent for turning off the heating unit switch 340 2 Outputs a PWM signal with a duty ratio.

Here, the predetermined first duty ratio is set to 100%, and the predetermined second duty ratio is set to 0% to drive and stop the heating unit 330 through the PWM signal output unit 314. Make this possible.

In addition, a separate on/off signal output unit that outputs an on/off signal may be additionally configured to control only the on/off of the heating unit 330.

In addition, the proper driving temperature of the battery cell during charging is 0 to 45°C, the proper driving temperature of the battery cell when discharging is -20 to 60°C, and the battery cell must maintain such an appropriate driving temperature. Therefore, the preset first reference temperature value is an appropriate minimum temperature at which the battery cell can be stably driven, and as an example, it is set to 5°C when charging and -10°C when discharging, but is not limited thereto. .

In addition, the preset second reference temperature value is set to 20°C when charging and 10°C when discharging, as an example, so that charging and discharging can be efficiently driven.

In addition, the PWM signal output unit 314, when the temperature measured by the heating unit temperature measuring unit 312 is equal to or higher than a preset third reference temperature value, the heating unit switches the initial PWM signal having a predetermined initial duty ratio. It can be output as a control signal of 340.

In general, when the battery pack exceeds 68°C, the battery pack expands, and when the temperature of the battery pack is 177°C, an explosion occurs. Accordingly, the preset third reference temperature value is set to 55°C as an exemplary embodiment to prevent deterioration or explosion of the battery pack due to heat of the heating unit, and this value is not limited thereto.

In addition, since the predetermined initial duty ratio of the initial PWM signal is determined to a preset third reference temperature value, if the preset third reference temperature value is greater than 50°C, the risk of swelling of the battery pack increases. A PWM signal is output by setting a predetermined initial duty ratio value to a small value (approximately 10 to 15%). If the preset third reference temperature value is less than 50°C, there is little risk of swelling of the battery pack. Therefore, the predetermined initial duty ratio value is set to an intermediate value (approximately 40-50%) and the battery pack Is protected from heat generated by the heating unit 330.

Meanwhile, in the following, a method of driving the battery pack temperature control device 300 will be described in detail.

The battery pack temperature control device 300 periodically measures the temperature of the battery cell through the battery cell temperature measuring unit 311, and when the measured temperature of the battery cell is less than or equal to a preset first reference temperature value, the PWM signal output unit 314 or a separate ON/OFF signal output unit (not shown) to output an ON control signal to the heating unit switch 340 supplying current to the heating unit 330.

The temperature of the heating unit 330 driven through the ON control is measured through the heating unit temperature measurement unit 312 at a predetermined time designated by the user, and the measured temperature of the heating unit 330 is a temperature comparison unit 313 It is checked whether it is higher than the preset third reference temperature value through.

If the temperature of the heating unit 330 is equal to or higher than a preset third reference temperature value, the PWM signal output unit 314 outputs an initial PWM signal having a predetermined initial duty ratio to the heating unit switch 340. .

When the temperature of the heating unit 330 controlled through the PWM signal is still higher than the limit temperature during re-measurement of the heating unit temperature, the PWM signal output unit 314 is compensated by reducing the duty ratio or period of the output PWM signal. The PWM signal is output to reduce the heat of the heating unit and allow the battery cell 320 to be heated.

When such a control is repeated and the temperature of the battery cell 320 is equal to or higher than a preset second reference temperature value, the PWM signal output unit 314 or a separate on/off signal output unit (not shown) is the heating unit switch The off control signal is output so that the 340 can be off-controlled.

In another embodiment, when the battery cell is in a low temperature state, unlike the above embodiment, a PWM signal having a duty ratio controlled from the beginning is output to allow the temperature of the heating unit to gradually increase. Such a method prevents a sudden increase in temperature of the heating unit and can easily predict the temperature change of the heating unit.

The battery cell temperature measurement unit 311 periodically measures the temperature of the battery cell, and when the measured temperature of the battery cell is less than or equal to a preset first reference temperature value, it is transmitted to the heating unit 330 through the PWM signal output unit 314. A control signal is output to the heating unit switch 340 that supplies current. If the temperature of the battery cell 320 is still less than the preset first reference temperature value and the temperature of the heating unit 330 is less than the preset third reference temperature value, the PWM signal output unit 314 is Outputs a correction PWM signal that increases the duty ratio or stock price. The corrected PWM signal output of the PWM signal output unit 314 is repeated until the temperature of the battery cell 320 is equal to or higher than a preset second reference temperature value, and if the temperature of the heating unit 330 during driving When the temperature is higher than the preset third reference temperature value, the PWM signal output is stopped to stop the driving of the heating unit.

Then, the battery cell temperature measurement unit 311 measures the temperature of the battery cell, and since the battery cell 320 temperature has not yet reached the second reference temperature value, restarting is started and the PWM signal output unit 314 is A PWM signal having a low duty ratio is output to the heating unit switch 340 so that the temperature of the heated heating unit 330 can be lowered.

On the other hand, although the technical idea of the present invention has been described in detail according to the above embodiment, it should be noted that the above embodiment is for the purpose of explanation and not for the limitation thereof. In addition, a person of ordinary skill in the technical field of the present invention may be able to implement various embodiments within the described claims.

300: battery pack temperature controller
310: BMS
311: battery cell temperature measuring unit
312: heating part temperature measuring part
313: temperature comparison unit
314: PWM signal output unit
320: battery cell
330: heating part
340: heating part switch

Claims (11)

In the method of controlling the temperature of the battery pack,
A battery cell temperature measuring step of periodically measuring the temperature of the battery cell;
A heating unit switch-on step of turning on a heating unit switch to drive the heating unit when the temperature of the battery cell measured in the battery cell temperature measurement step is less than or equal to a preset first reference temperature value;
A battery cell temperature maintaining step of turning on/off a switch of the heating unit at a predetermined period when the heating unit temperature is higher than a predetermined temperature after the heating unit is driven in the heating unit switch-on step; And
A heating unit switch-off step of turning off the heating unit switch when the temperature of the battery cell measured in the battery cell temperature maintaining step is greater than or equal to a preset second reference temperature value;
Consists of including,
The battery cell temperature maintaining step,
A heating unit temperature measuring step of measuring a temperature of a heating unit to which current is supplied from a controlled switch turned on in the heating unit switching on step;
A heating unit temperature comparison step of comparing the temperature of the heating unit measured in the heating unit temperature measuring step with a preset third reference temperature value; And
When the measured temperature of the heating unit is equal to or higher than a preset third reference temperature value as a result of the comparison of the heating unit temperature comparison step, an initial pulse modulation (PWM) signal having a predetermined initial duty ratio is used as a control signal of the heating unit switch. Outputting a pulse modulated (PWM) signal;
Battery pack temperature control method comprising a. delete The method according to claim 1,
The battery pack temperature control method, characterized in that the predetermined initial duty ratio of the initial pulse modulation (PWM) signal is determined by a predetermined third reference temperature value.
The method according to claim 1,
When the initial pulse modulation (PWM) signal is output in the pulse modulation (PWM) signal output stage and the temperature measured when measuring the temperature of the heating unit is a preset third reference temperature value, the duty ratio of the output pulse modulation (PWM) signal Or outputting a correction pulse modulation (PWM) signal with a reduced period.
In the temperature control device of a battery pack composed of a plurality of battery cells,
A heating unit formed to surround the plurality of battery cells;
A heating unit switch unit for turning on/off current supply to the heating unit; And
A BMS outputting a pulse modulated (PWM) signal so that a switch of the heating unit is controlled on/off according to the temperature of the heating unit;
Consisting of including,
The BMS is,
A battery cell temperature measuring unit measuring the temperature of the battery cell;
A heating unit temperature measuring unit measuring the temperature of the heating unit;
A temperature comparison unit comparing the temperature measured by the battery cell temperature measurement unit and the temperature measured by the heating unit temperature measurement unit with respective reference temperature values;
A pulse modulation (PWM) signal output unit for outputting a pulse modulation (PWM) signal having a predetermined duty ratio according to the comparison result of the temperature comparison unit;
Consists of including,
The pulse modulation (PWM) signal output unit,
When the temperature of the battery cell measured by the battery cell temperature measuring unit is less than or equal to a preset first reference temperature value, a pulse modulation (PWM) signal having a predetermined first duty ratio for turning on the heating unit switch is output, and
When the temperature of the battery cell measured by the battery cell temperature measuring unit is greater than or equal to a preset second reference temperature value, a pulse modulated (PWM) signal having a predetermined second duty ratio for turning off the heating unit switch is output. Battery pack temperature control device. delete delete The method of claim 5,
The BMS is,
And an on/off signal output unit for outputting an on/off switching control signal of the heat generating unit switch.
The method of claim 5,
The pulse modulation (PWM) signal output unit,
When the temperature of the heating unit measured by the heating unit temperature measuring unit is higher than or equal to a preset third reference temperature value, an initial pulse modulation (PWM) signal having a predetermined initial duty ratio is output as a control signal of the heating unit switch. Battery pack temperature control device.
The method of claim 9,
The battery pack temperature control device, characterized in that the predetermined initial duty ratio of the initial pulse modulation (PWM) signal is determined by a predetermined third reference temperature value.
The method of claim 5,
The BMS is a battery pack temperature control apparatus, characterized in that it is configured to further include a BMS temperature measuring unit for measuring the temperature of the elements in the BMS.

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