KR-20260064067-A - Battery voltage detection device and battery assembly and vehicle comprising same

KR20260064067AKR 20260064067 AKR20260064067 AKR 20260064067AKR-20260064067-A

Abstract

A battery voltage detection device according to the present invention comprises: a main detection unit that detects the voltage of a corresponding battery among a plurality of batteries at a main cycle; a sub detection unit that detects the voltage of the corresponding battery separately from the main detection unit, but detects it at a sub cycle shorter than the main cycle; and a control unit configured to determine whether the voltage of the corresponding battery is abnormal based on the voltage values of the corresponding battery detected by the main detection unit and the sub detection unit, respectively.

Inventors

최제연

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (12)

A main detection unit that detects the voltage of a corresponding battery among multiple batteries at every main cycle; A sub-sensing unit that detects the voltage of the corresponding battery separately from the main sensing unit, and detects it at sub-cycles shorter than the main cycle; and A battery voltage detection device comprising a control unit configured to determine whether the voltage of the corresponding battery is abnormal based on the voltage values of the corresponding battery detected by the main detection unit and the sub detection unit, respectively.
In paragraph 1, A battery voltage detection device characterized in that the main detection unit is configured to transmit the first voltage value of the corresponding battery, detected at each main cycle, together with the voltage value of another battery included in the plurality of batteries, to the control unit.
In paragraph 1, A battery voltage sensing device characterized by including a plurality of main sensing units corresponding to each of the plurality of batteries.
In paragraph 3, The above main detection unit is, A first voltage value generation module configured to generate a first voltage value representing the voltage of the corresponding battery when the above main cycle arrives; and A battery voltage sensing device characterized by including a first communication module configured to transmit the first voltage value to another main sensing unit or the control unit.
In paragraph 1, A battery voltage detection device characterized in that the sub-sensing unit is configured to transmit the second voltage value to the control unit when the second voltage value of the corresponding battery detected at each sub-cycle does not fall within a predetermined reference range.
In paragraph 5, A battery voltage sensing device characterized in that the sub-sensing unit is configured to ignore or remove the second voltage value without transmitting it to the control unit when the second voltage value falls within the reference range.
In paragraph 1, The above sub-sensing unit is, A second voltage value generation module configured to generate a second voltage value representing the voltage of the corresponding battery when the above sub-cycle arrives; A judgment module configured to determine whether the above second voltage value falls within a predetermined standard range; and A battery voltage detection device characterized by including a second communication module configured to transmit the second voltage value to the control unit when it is determined that the second voltage value does not fall within the reference range, and not transmit the second voltage value to the control unit when it is determined that the second voltage value falls within the reference range.
In paragraph 1, A battery voltage sensing device characterized by including a plurality of sub-sensing units corresponding to each of the plurality of batteries.
In paragraph 1, A battery voltage detection device characterized in that, when the above control unit determines that the voltage of the corresponding battery is abnormal, the detection period of the sub-detection unit detecting the voltage of the corresponding battery is changed from the sub-period to a period shorter than the sub-period.
In paragraph 1, A battery voltage detection device characterized in that the above-described control unit is configured to adjust the charge or discharge amount of the corresponding battery when it is determined that the voltage of the corresponding battery is abnormal.
A battery assembly comprising a battery voltage sensing device according to any one of claims 1 to 10.
A vehicle comprising a battery voltage sensing device according to any one of claims 1 to 10.

Description

Battery voltage detection device and battery assembly and vehicle comprising same The present invention relates to a battery voltage sensing device and a battery assembly and a vehicle including the same, and more specifically, to a battery voltage sensing device for sensing the voltage of each of a plurality of batteries, and a battery assembly and a vehicle including the battery voltage sensing device. Generally, a secondary battery refers to a battery capable of repeated charging and discharging, such as lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. A battery cell, which is the most basic type of secondary battery, can provide an output voltage of approximately 2.5V to 4.2V. Recently, as these secondary batteries are applied to devices requiring high output voltage or large charging capacity, such as electric vehicles or Energy Storage Systems (ESS), battery assemblies containing multiple batteries (battery cells or battery modules) connected in series and/or parallel are being widely used. To ensure the safety and performance of such battery assemblies, appropriate measures must be taken for batteries among those included in the assembly that exhibit abnormal voltage changes. However, conventional Battery Management Systems (BMS) must sense and process the voltage values of multiple batteries during a sensing cycle of several hundred milliseconds, making it difficult to reduce the sensing cycle. As a result, existing technology has a problem in that it cannot detect instantaneous changes in battery voltage that occur during a time of several tens of microseconds, which is shorter than the sensing cycle of the BMS. FIG. 1 is a block diagram showing a battery voltage sensing device according to one embodiment of the present invention. FIG. 2 is a block diagram showing the main sensing unit of a battery voltage sensing device according to one embodiment of the present invention. FIG. 3 is a block diagram showing a sub-sensing unit of a battery voltage sensing device according to one embodiment of the present invention. FIG. 4 is a graph showing the main cycle in which the main detection unit of a battery voltage detection device according to one embodiment of the present invention detects the voltage of the battery. FIG. 5 is a graph showing the sub-cycle in which the sub-sensing unit of a battery voltage sensing device according to one embodiment of the present invention senses the voltage of the battery. Figure 6 is a flowchart showing an example of voltage detection operation by the main detection unit. Figure 7 is a flowchart showing an example of voltage detection operation by a sub-sensor. FIG. 8 is a drawing showing a battery assembly according to one embodiment of the present invention. FIG. 9 is a drawing showing a vehicle according to one embodiment of the present invention. Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings to clarify solutions corresponding to the technical problems of the present invention. However, in describing the present invention, if a description of related prior art would obscure the essence of the present invention, such description may be omitted. Furthermore, terms used in this specification are defined considering their functions in the present invention, and these may vary depending on the intentions or conventions of designers, manufacturers, etc. Therefore, the definitions of terms described below should be based on the content throughout this specification. FIG. 1 is a block diagram showing a battery voltage sensing device (100) according to one embodiment of the present invention. As illustrated in FIG. 1, a battery voltage detection device (100) according to one embodiment of the present invention includes a main detection unit (110), a sub-detection unit (120), and a control unit (130). The main detection unit (110) is configured to detect the voltage of a corresponding battery among a plurality of batteries B1 to Bn whenever a predetermined main cycle arrives. For example, the main detection unit 1 can detect the voltage of a corresponding battery B1 among a plurality of batteries B1 to Bn every main cycle. In this case, the main cycle can be determined according to the number of batteries to be detected by the battery voltage detection device (100). For example, the main cycle can be determined in the range from 100 [ms] to 1000 [ms]. The battery voltage detection device (100) may include a plurality of main detection units (main detection units 1 to n) corresponding to a plurality of batteries B1 to Bn, respectively. Additionally, each main detection unit (110) may be configured to transmit the voltage value of the corresponding battery detected during each main cycle to a control unit (130) described later. In one embodiment, each main detection unit (110) may be configured to transmit a first