KR-20260065305-A - VEHICHLE BETTERY CHARGING METHOD AND VEHICLE BATTERY CHARGING CONTOROL DEVICE

KR20260065305AKR 20260065305 AKR20260065305 AKR 20260065305AKR-20260065305-A

Abstract

A battery charging control method for a vehicle according to one embodiment of the present invention may include the steps of determining whether the battery SOC is normal and the vehicle driving distance, obtaining battery data by measuring at least one of the open circuit voltage, charging current, charging current accumulation, and internal resistance of the battery, classifying a failure type of the battery based on the battery data, and adjusting the charging voltage of the battery according to the classified failure type.

Inventors

임경현

Assignees

현대자동차주식회사
기아 주식회사

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (19)

A step for determining whether the battery SOC is normal and the vehicle driving range; A step of obtaining at least one battery data among the open circuit voltage (OCV), charging current, integrated charging current, and internal resistance of the battery; A step of classifying the failure type of the battery based on the battery data; and A method for charging a vehicle battery, comprising the step of adjusting the charging voltage of the battery according to the above-classified failure type.
In paragraph 1, A method for charging a vehicle battery, wherein the above battery includes a 12V battery.
In paragraph 1, The step of determining whether the battery SOC is normal and the vehicle driving range is, A method for charging a vehicle battery, comprising: instructing to diagnose a battery failure based on SOH when the above SOC is determined to be normal and the above vehicle driving distance is below a set value.
In paragraph 1, A method for charging a vehicle battery, wherein the step of acquiring battery data and the step of classifying the failure type are performed when the SOC is abnormal or the vehicle driving distance is determined to be greater than or equal to a set value in the step of determining whether the battery SOC is normal and the vehicle driving distance.
In paragraph 1, The step of determining whether the battery SOC is normal and the vehicle driving range is, A method for charging a vehicle battery, comprising determining an untrusted state of the SOC and/or an unlearned state of the SOC when the above SOC is determined to be abnormal.
In paragraph 1, The above failure type is, A method for charging a vehicle battery comprising at least one of a short circuit, corrosion, and sulfation of the electrode plates of the battery.
In paragraph 6, The step of analyzing the failure type of the battery based on the measured data is: A method for charging a vehicle battery, comprising classifying the charge current of the battery as a short circuit when the charge current accumulation amount is greater than or equal to a set accumulation amount value and the open circuit voltage is less than or equal to a first reference voltage value.
In paragraph 6, The step of analyzing the failure type of the battery based on the measured data is: A method for charging a vehicle battery, comprising classifying corrosion when the internal resistance of the battery is greater than or equal to a set resistance value and the open circuit voltage is greater than or equal to a second reference voltage value.
In paragraph 6, The step of analyzing the failure type of the battery based on the measured data is: A method for charging a vehicle battery, comprising classifying it as sulphation when the charging current of the battery is less than or equal to a set current value and the open circuit voltage is less than or equal to a third reference voltage value.
In paragraph 6, The step of adjusting the charging voltage of the battery according to the above-classified failure type is, A method for charging a vehicle battery, comprising lowering the battery charging voltage to a first charging voltage or lower in the case of the above-mentioned electrode plate short circuit and the above-mentioned corrosion, and raising the battery charging voltage to a second charging voltage or higher in the case of the above-mentioned sulfation.
Memory containing computer instructions for battery charging control; and It includes one or more processors that execute the computer instructions stored in the memory, As the above one or more processors execute the above computer instructions, Determine whether the battery SOC is normal and the vehicle's driving range, and Battery data is obtained by measuring at least one of the Open Circuit Voltage (OCV), charging current, integrated charging current, and internal resistance of the above battery, and Based on the above battery data, classify the failure types of the above battery, and A vehicle battery charging control device that adjusts the charging voltage of the battery according to the above-classified fault types.
In Paragraph 11, The above battery is a vehicle battery charging control device including a 12V battery.
In Paragraph 11, Determining whether the above battery SOC is normal and the vehicle driving range is, A vehicle battery charging control device comprising: a command to diagnose a battery failure based on SOH when the above SOC is determined to be normal and the above vehicle driving distance is below a set value.
In Paragraph 11, Determining whether the above battery SOC is normal and the vehicle driving range is, A vehicle battery charging control device comprising determining an unreliable SOC state and/or an unrelearned SOC state when the above SOC is determined to be abnormal.
In Paragraph 11, The above failure type is, A vehicle battery charging control device comprising at least one of a short circuit, corrosion, and sulfation of the electrode plates of the battery.
In paragraph 15, Analyzing the failure type of the battery based on the above-mentioned measured data is, A vehicle battery charging control device comprising classifying the charge current of the battery as a short circuit when the accumulated charge current is greater than or equal to a set accumulated value and the open circuit voltage is less than or equal to a first reference voltage value.
In paragraph 15, Analyzing the failure type of the battery based on the above-mentioned measured data is, A vehicle battery charging control device comprising classifying corrosion when the internal resistance of the battery is greater than or equal to a set resistance value and the open circuit voltage is greater than or equal to a second reference voltage value.
In paragraph 15, Analyzing the failure type of the battery based on the above-mentioned measured data is, A vehicle battery charging control device comprising classifying as sulphation when the charging current of the battery is less than or equal to a set current value and the open circuit voltage is less than or equal to a third reference voltage value.
In paragraph 15, Adjusting the charging voltage of the battery according to the above-classified failure types is, A vehicle battery charging control device comprising lowering the battery charging voltage to a first charging voltage or lower in the case of the above electrode plate short circuit and the above corrosion, and raising the battery charging voltage to a second charging voltage or higher in the case of the above sulfation.

Description

Vehicle battery charging method and vehicle battery charging control device The present invention relates to a method for charging a vehicle battery and a vehicle battery charging control device. The present invention relates to a battery management system (BMS) for an electric vehicle and related charging logic, and in particular to a technology capable of effectively performing fault diagnosis when the state of charge (SOC) of the battery is unreliable and/or unlearned. Conventional electric vehicle battery management systems perform battery charging and fault diagnosis based on State of Charge (SOC). However, if the SOC is unreliable or has not been learned, it becomes difficult to accurately determine the battery's condition, making fault diagnosis challenging. In particular, if the battery is left discharged for a long period or if the charging and discharging cycles are irregular, the SOC is prone to falling into an unstable state. Due to these issues, battery management systems may fail to perform proper recharge or diagnose battery failures early. Furthermore, existing technology cannot effectively control the battery charging logic when the State of Charge (SOC) is unreliable, posing a risk of degraded battery performance or shortened lifespan. Therefore, a new management system is required that can accurately diagnose the battery status when the SOC is in an unreliable and/or unlearned state. Existing technologies have limitations in that, when the SOC is unstable, they cannot accurately measure the battery charge status, leading to missed charging times or a failure to detect battery failure until it actually occurs. To solve these problems, the present invention proposes a new charging logic that improves battery life by detecting battery failure early and extending the period during which rechargeable charging is possible, even when the SOC is in an unreliable and/or unlearned state. FIG. 1 is a flowchart of a supplementary logic according to one embodiment of the present invention. FIG. 2 is a flowchart diagram of a vehicle battery charging method according to one embodiment of the present invention. The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. The suffixes "module" and "part" used in this specification are used merely for nominal distinction between components and should not be interpreted as presupposing that they are physically or chemically distinguished or separated, or that they can be distinguished or separated in this way. Terms containing ordinal numbers, such as “first,” “second,” etc., may be used to describe various components, but said components are not limited by said terms. These terms may be used solely in a nominal sense to distinguish one component from another, and their sequential meaning is determined not by such nomenclature but by the context of the description. The term “and/or” is used to include any combination of the multiple items in question. For example, “A and/or B” means including all three cases, such as “A,” “B,” and “A and B.” When it is stated that one component is "connected" or "joined" to another component, it should be understood that while it may be directly connected or joined to that other component, there may also be other components in between. The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application. Furthermore, "unit," "control unit," "control device," or "controller" are merely terms widely used to name devices that control the corresponding function, and do not imply a generic function unit. For example, a device referred to by these names may include a communicati