KR102268638B1 - System and method for judging battery's replacement time - Google Patents

Abstract

The present invention provides a system and method for determining when to replace a battery. When the battery replacement timing determination system enters a sleep mode or a wake-up mode when the first battery and the second battery installed in the vehicle enter a sleep mode or a wake-up mode, the SOC (State) between the first battery and the second battery Of Charge) an SOC calculator that calculates a difference value, and if the calculated difference value exceeds a threshold, compares the SOC variation of each of the first battery and the second battery during the sleep mode to determine the larger of the SOC variation It includes a replacement time determining unit for notifying the replacement time of the battery having.

Description

SYSTEM AND METHOD FOR JUDGING BATTERY'S REPLACEMENT TIME}

The present invention relates to a system and method for determining when to replace a battery, and more particularly, to a battery replacement for a vehicle that provides the advantage of reducing the replacement cost and extending the life of the battery by determining the replacement of the vehicle battery in a timely manner and notifying the driver A timing judgment system and method are provided.

The battery generates electrical energy by the chemical action of the electrolyte to supply power to the device. A battery that is repeatedly charged and discharged to supply power ages over time, and as the battery ages, the amount of current charged in the battery is lost.

For example, when the charge/discharge cycle of a lithium-ion battery is repeated about 500 times and a nickel-manganese battery about 300 times, 60% of the initial capacity (rated capacity) is introduced into the battery. current decreases.

Accordingly, periodic battery replacement is required, and in the case of vehicle batteries, when the starter motor starts to feel weak, when the light is weak, when the discharge cycle is shortened to within 2-3 days, etc. are considered as the battery replacement time. It has an average cycle of 2 to 3 years or a mileage of 50,000 to 60,000 km.

As described above, when it is time to replace the vehicle battery, the driver checks the status indicator at the top of the battery, and replaces the battery when the status indicator is black or white even after charging.

However, the conventional battery replacement system is a system that simultaneously replaces two batteries connected in series or parallel, and the user does not recognize this fact and uses it despite the existence of usable batteries due to the different aging degrees of the two batteries. There is a problem of replacing all the possible batteries.

In addition, even if the user replaces one of the two batteries, which is determined to have a high degree of aging, timely replacement is rare, and thus there is a problem that adversely affects the life of the other battery.

In order to solve the above-described problem, the present invention measures the SOC (State Of Charge) value of batteries mounted in a vehicle, connected in series or in parallel, and using the measured SOC value of the batteries, replacement among two batteries is possible. An object of the present invention is to provide a battery replacement timing determination system and method for determining a required battery and notifying a driver thereof.

In the battery replacement timing determination system according to an aspect of the present invention for achieving the above object, when the first battery and the second battery enter a sleep mode, the first battery and the second battery immediately before the sleep mode Calculate a first SOC (State Of Charge) difference between the two batteries, and if the first battery and the second battery are in a wake-up mode, calculate a second SOC difference value between the first battery and the second battery in the wake-up mode and an SOC calculator for calculating a deviation between the calculated first SOC difference and the second SOC difference value, and when the calculated deviation exceeds a threshold, the SOC of each of the first battery and the second battery during the sleep mode and a replacement timing determining unit informing of replacement of a battery having a larger value among the SOC variation by comparing the variation.

Here, the SOC variation during the sleep mode means a difference between the SOC values measured just before the sleep mode and during the wakeup mode.

In addition, the battery replacement timing determination system according to an aspect of the present invention further includes an SOC measuring unit for measuring the SOC of the first battery and the second battery.

When the first battery and the second battery enter the sleep mode from the normal mode, the SOC measurement unit measures the SOC immediately before entering the sleep mode of the first battery and the second battery by using the current integration method.

And when the first battery and the second battery go through the sleep mode and wake-up mode, the SOC measuring unit checks the sleep mode maintenance time of the first battery and the second battery, and the sleep mode maintenance time is a preset time In case of abnormality, open circuit voltage (OCV) of the first battery and the second battery is measured to measure the SOC of the first battery and the second battery in the wake-up mode.

The first battery and the second battery have the same capacity, are connected to each other, and are mounted in a vehicle.

Meanwhile, in the method for determining when to replace a battery according to another aspect of the present invention, when the first battery and the second battery enter the sleep mode, the first SOC difference value between the first battery and the second battery immediately before the sleep mode is calculated. when the first battery and the second battery are in a wake-up mode, calculating a second SOC difference value between the first battery and the second battery in the wake-up mode, the calculated first SOC difference and calculating a deviation between the second SOC difference values and determining whether the calculated deviation exceeds a threshold value; if the calculated deviation exceeds a threshold value, each of the first battery and the second battery during the sleep mode and comparing the SOC variation to notify replacement of a battery having a larger value among the SOC variation.

Calculating the first SOC difference value includes measuring the SOCs of the first battery and the second battery just before the sleep mode by using a current integration method.

The calculating of the second SOC difference value may include checking sleep mode maintenance times of the first battery and the second battery, and when the sleep mode maintenance time is equal to or greater than a preset time, the first battery and the second battery and measuring the SOC of the first battery and the second battery in the wake-up mode by measuring the OCV.

Also, the SOC variation during the sleep mode means a difference between the SOC values measured just before the sleep mode and during the wakeup mode.

According to the present invention, a battery that needs to be selectively replaced among two batteries connected in series or parallel is determined and timely notified to the driver, thereby reducing the replacement cost and extending the life of the battery.

1 is a block diagram showing the configuration of a battery replacement time determination system according to an embodiment of the present invention.
2 is a flowchart illustrating a process of a method for determining when to replace a battery according to an embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains The scope of the present invention is determined by the description of the claims because it is only provided to fully inform the person who has the scope of the invention.

On the other hand, the terms used herein are for the purpose of describing the embodiments and are not intended to limit the present invention. As used herein, the singular also includes the plural, unless the phrase specifically states otherwise. As used herein, “comprises” and/or “comprising” refers to the presence of one or more other components, steps, operations and/or elements in a referenced element, step, operation and/or element. or addition is not excluded. Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the configuration of a battery replacement time determination system according to an embodiment of the present invention.

As shown in FIG. 1 , the battery replacement time determination system according to an embodiment of the present invention includes an SOC measurement unit 100 , an SOC calculation unit 110 , a replacement time determination unit 120 , and a driver notification unit 130 . includes

The SOC measuring unit 100 determines that the mode of the first battery 11 and the second battery 12 included in the battery pack 10 mounted on the vehicle is set to a normal mode when the vehicle is turned off. In the sleep mode, the SOC values of the first battery 11 and the second battery 12 just before entering the sleep mode are measured using the current integration method (Last SOC A, Last SOC B).

Here, the first battery 11 and the second battery 12 have the same capacity and may be batteries connected in series or parallel to each other.

And when the mode of the first battery 11 and the second battery 12 is switched from the sleep mode to the wake-up mode, the SOC measuring unit 100 determines that the first battery 11 and the second battery 12 ( 12), SOC values are measured in the wake-up mode of the first battery 11 and the second battery 12 by using the OCV (Open Circuit Voltage) (Recall SOC A, Recall SOC B).

In particular, when the SOC measurement unit 100 measures the SOC value during the wake-up mode operation of the first battery 11 and the second battery 12 , the first battery 11 and the second battery 12 are in the sleep mode. The holding time is checked, and when the sleep mode holding time is equal to or greater than a preset time, the SOC values (Recall SOC A, Recall SOC B) are calculated during the wake-up mode operation of the first battery 11 and the second battery 12 . .

Here, the preset time means a time for which the first battery 11 and the second battery 12 are stabilized, and may be a different set time (eg, 3 hours) according to the type and capacity of the battery.

Thereafter, the SOC measurement unit 100 performs SOC values (Last SOC A, Last SOC B, Recall SOC A, Recall SOC) of the first battery 11 and the second battery 12 immediately before entering the sleep mode and during the wake-up mode operation. B) is provided to the SOC calculator 110 .

The SOC calculator 110 sleeps using the SOC values (Last SOC A, Last SOC B) of the first battery 11 and the second battery 12 just before entering the sleep mode provided by the SOC measuring unit 100 . A first SOC difference value (Last SOC (AB)) between the first battery 11 and the second battery 12 just before entering the mode is calculated.

In addition, the SOC calculator 110 uses the SOC values (Recall SOC A, Recall SOC B) of the first battery 11 and the second battery 12 in the wake-up mode provided by the SOC measuring unit 100 . A second SOC difference value (Recall SOC (AB)) between the first battery 11 and the second battery 12 in the wake-up mode is calculated.

When the calculation of the first SOC difference value (Last SOC (AB)) and the second SOC difference value (Recall SOC (AB)) is completed, the SOC calculator 110 calculates the first SOC difference value (Last SOC (AB)) and a deviation (|Last SOC (AB)-Recall SOC (AB)|) between the second SOC difference value (Recall SOC (AB)) is calculated, and the calculated result value is provided to the replacement time determining unit 120 .

The replacement time determining unit 120 determines the difference between the first SOC difference value and the second SOC difference value provided by the SOC calculator 110 (|Last SOC (AB)-Recall SOC (AB)|) and a threshold (eg, 15%) to determine whether the threshold of deviation (|Last SOC (AB)-Recall SOC (AB)|) is exceeded.

If the deviation between the first SOC difference value and the second SOC difference value (|Last SOC (AB)-Recall SOC (AB)|) exceeds the threshold, the first battery 11 and the second battery 12 during the sleep mode ) Calculate each SOC variation (ΔSOC A, ΔSOC B).

Here, the SOC variation (ΔSOC A, ΔSOC B) is specifically the difference (SOC A (Last-Recall), SOC) between the SOC values measured by the SOC measuring unit 100 just before the sleep mode and during the wake-up mode operation. B (Last-Recall)). That is, ΔSOC A = SOC A (Last-Recall), ΔSOC B = SOC B (Last-Recall).

And the replacement timing determining unit 120 determines that replacement of the battery having a larger value among the SOC variation amounts (ΔSOC A, ΔSOC B) of the first battery 11 and the second battery 12 is necessary, Through the driver notification unit 130 mounted on the vehicle, it warns the driver that the battery needs to be replaced. In this case, the driver notification unit 130 may be an output device that outputs voice or text.

2 is a flowchart illustrating a process of a method for determining when to replace a battery according to an embodiment of the present invention.

As shown in FIG. 2 , in the method for determining when to replace a battery according to an embodiment of the present invention, first, the modes of the first battery and the second battery installed in the vehicle are checked, and the first battery and the second battery are normal. mode, the SOC values of the first battery and the second battery are calculated using the current integration method (S200).

In addition, when the vehicle is turned off and the first battery and the second battery are switched from the normal mode to the sleep mode, the SOC values of the first battery and the second battery just before entering the sleep mode are calculated and stored in memory (Last SOC A, Last SOC). B) (S210).

Thereafter, when the first battery and the second battery go through the sleep mode and switch to the wakeup mode, the sleep mode maintenance time is checked ( S220 ), and when the sleep mode maintenance time is equal to or longer than a preset time, the first battery and the second battery During the wakeup mode operation, the SOC value is measured using the OCVs of the first battery and the second battery (Recall SOC A, Recall SOC B) (S230).

Here, the preset time means a time for which the first battery and the second battery are stabilized, and may be a different set time (eg, 3 hours) according to the type and capacity of the battery.

When the SOC values (Last SOC A, Last SOC B, Recall SOC A, Recall SOC B) of the first and second batteries just before entering the sleep mode and during wakeup mode operation are completed, the measured SOC values immediately before entering the sleep mode are completed. A first SOC difference value (Last SOC (AB)) is calculated using the SOC values (Last SOC A, Last SOC B) of the first battery and the second battery. Then, a second SOC difference value Recall SOC(A-B) is calculated using the measured SOC values Recall SOC A and Recall SOC B of the first battery and the second battery during the wakeup mode operation.

When the calculation of the first SOC difference value (Last SOC (AB)) and the second SOC difference value (Recall SOC (AB)) is completed, the difference between the calculated first SOC difference value and the second SOC difference value (|Last SOC) (AB)-Recall SOC (AB)|) is calculated (S240).

When the calculation of the deviation between the first SOC difference value and the second SOC difference value (|Last SOC (AB)-Recall SOC (AB)|) is completed, the deviation between the first SOC difference value and the second SOC difference value (|Last SOC) (AB)-Recall SOC (AB)|), it is determined whether the threshold is exceeded.

And, when the deviation between the first SOC difference value and the second SOC difference value (|Last SOC (AB)-Recall SOC (AB)|) exceeds the threshold, the SOC variation amount of each of the first battery and the second battery during the sleep mode (ΔSOC A, ΔSOC B) is calculated (S250).

Here, the SOC variation (ΔSOC A, ΔSOC B) is specifically the difference between the SOC values measured immediately before the sleep mode and during the wakeup mode operation (SOC A (Last-Recall), SOC B (Last-Recall)) means That is, ΔSOC A = SOC A (Last-Recall), ΔSOC B = SOC B (Last-Recall).

When the calculation of the SOC variation (ΔSOC A, ΔSOC B) of each of the first battery and the second battery is completed, the larger value of the SOC variation (ΔSOC A, ΔSOC B) of each of the first and second batteries is calculated. It is determined that replacement of the battery is necessary ( S260 ), and the time to replace the battery is notified to the driver through a voice or text output device mounted on the vehicle.

The above description is merely illustrative of the technical idea of the present invention, and various modifications and variations are possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments expressed in the present invention are not intended to limit the technical spirit of the present invention, but to illustrate, and the scope of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas that are equivalent to or within the equivalent range should be construed as being included in the scope of the present invention.

Claims (10)

Measure or calculate the SOC values of a first battery and a second battery mounted in a vehicle and connected to each other, but the SOC value (Last SOC A) of the first battery when entering the sleep mode and the second battery when entering the sleep mode Measure or calculate the SOC value (Last SOC B) of , and when the first battery and the second battery are switched from the sleep mode to the wake-up mode, the sleep is the time during which the first battery and the second battery are stabilized When the duration of the mode is longer than a preset time, the SOC value of the first battery in the wakeup mode (Recall SOC A) and the SOC value of the second battery in the wakeup mode (Recall SOC B) are measured or a first SOC difference value between the first battery and the second battery (Last SOC A-Last SOC B), and a second SOC difference value between the first battery and the second battery (Recall SOC A- Recall) SOC calculator for calculating SOC B); and
When the difference between the first SOC difference value and the second SOC difference value exceeds a threshold, the SOC variation amount (ΔSOC A, ΔSOC B) of each of the first battery and the second battery during the sleep mode is compared. A replacement time determination unit notifying the replacement time of the battery having a larger value among the SOC variations
Battery replacement timing determination system comprising a.
delete According to claim 1,
The SOC calculator measures the SOC value (Last SOC A) of the first battery when entering the sleep mode and the SOC value (Last SOC B) of the second battery when entering the sleep mode by using the current integration method
Phosphorus battery replacement timing system.
delete delete According to claim 1,
Driver notification unit for outputting the battery replacement time determined by the replacement time determination unit to the driver by voice or text
Battery replacement timing determination system further comprising a.
(a) Measuring or calculating the SOC values of a first battery and a second battery that are mounted on the vehicle and connected to each other, the SOC value of the first battery (Last SOC A) when entering the sleep mode, and the SOC value when entering the sleep mode The time for which the first battery and the second battery are stabilized when the SOC value (Last SOC B) of the second battery is measured or calculated, and the first battery and the second battery are switched from the sleep mode to the wake-up mode When the duration of the sleep mode is greater than or equal to a preset time, the SOC value of the first battery in the wakeup mode (Recall SOC A) and the SOC value of the second battery in the wakeup mode (Recall SOC B) ) is measured or calculated, and a first SOC difference value between the first battery and the second battery (Last SOC A-Last SOC B), and a second SOC difference value between the first battery and the second battery (Recall SOC) calculating A- Recall SOC B); and
(b) when the difference between the first SOC difference value and the second SOC difference value exceeds a threshold, the amount of SOC change (ΔSOC A, ΔSOC B) of the first battery and the second battery during the sleep mode comparing and notifying the replacement time of a battery having a larger value among the SOC variation.
A method of determining when to replace the battery, including a.
8. The method of claim 7,
The step (a) is to measure the SOC value (Last SOC A) of the first battery when entering the sleep mode and the SOC value (Last SOC B) of the second battery when entering the sleep mode by using the current integration method
How to determine when to replace a phosphorus battery.
8. The method of claim 7,
The step (b) is to output the battery replacement time to the driver by voice or text
How to determine when to replace a phosphorus battery. delete

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