KR-20260067342-A - BATTERY MANAGEMENT SYSTEM AND BATTERY MANAGEMENT METHOD

KR20260067342AKR 20260067342 AKR20260067342 AKR 20260067342AKR-20260067342-A

Abstract

A battery management system and a battery management method are provided. The battery management system according to the present invention includes a sensing unit for acquiring charging status information of a battery pack, a control unit for determining a target cooling intensity based on the charging status information, and a communication unit for transmitting a cooling control request indicating the target cooling intensity to a battery cooling device.

Inventors

이종우
김진수
이창희

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260512
Application Date: 20251103
Priority Date: 20241105

Claims (15)

A sensing unit for acquiring charging status information of a battery pack; A control unit that determines a target cooling intensity based on the above charging status information; and A communication unit that transmits a cooling control request indicating the above-mentioned target cooling intensity to a battery cooling device; A battery management system including
In paragraph 1, The above sensing unit is, A battery management system that monitors charging status information while the battery pack is being charged according to a multi-stage constant current charging protocol.
In paragraph 1, The above target cooling intensity is, A battery management system comprising a target value for at least one of the flow rate and temperature of the refrigerant supplied by the battery cooling device.
In paragraph 1, The above control unit is, Based on the ambient temperature indicated by the above charging status information, one of the cooling control maps among the plurality of cooling control maps associated with the plurality of ambient temperature ranges is selected, and A battery management system that determines the target cooling intensity by inputting the pack temperature and pack SOC indicated by the above charging status information into the above selected cooling control map.
In paragraph 4, Each of the above plurality of cooling control maps is, A battery management system comprising a lookup table including multiple target cooling intensities according to a combination of multiple pack SOC ranges and multiple pack temperature ranges.
In paragraph 5, A battery management system in which at least one of the above plurality of target cooling intensities is greater than the reference cooling intensity.
In paragraph 5, Among the plurality of target cooling intensities above, at least one target cooling intensity associated with a pack temperature range below a predetermined damping temperature is greater than a reference cooling intensity, and A battery management system in which, among the plurality of target cooling intensities, all target cooling intensities associated with a pack temperature range greater than the attenuation temperature are greater than the reference cooling intensities.
In paragraph 4, The cooling control range of the cooling control map associated with a relatively high ambient temperature range among the plurality of cooling control maps above is, A battery management system that is extended or strengthened compared to the cooling control range of a cooling control map associated with a relatively low ambient temperature range among the plurality of cooling control maps above.
A battery pack comprising a battery management system according to any one of paragraphs 1 through 8.
Battery pack pursuant to Paragraph 9; and A battery cooling device provided for cooling the above battery pack; An electric vehicle including
Step of obtaining charging status information of the battery pack; A step of determining a target cooling intensity based on the above charging status information; and A step of transmitting a cooling control request indicating the above-mentioned target cooling intensity to a battery cooling device; A battery management method including
In Paragraph 11, The step of determining the above target cooling intensity is, A step of selecting one of a plurality of cooling control maps associated with a plurality of ambient temperature ranges based on the ambient temperature indicated by the above charging status information; and A step of determining the target cooling intensity by inputting the pack temperature and pack SOC indicated by the above charging status information into the selected cooling control map; A battery management method including
In Paragraph 12, Each of the above plurality of cooling control maps is, A battery management method comprising a lookup table including multiple target cooling intensities according to a combination of multiple pack SOC ranges and multiple pack temperature ranges.
In Paragraph 12, Among the plurality of target cooling intensities above, at least one target cooling intensity associated with a pack temperature range below a predetermined damping temperature is greater than a reference cooling intensity, and A battery management method in which all target cooling intensities associated with a pack temperature range greater than the attenuation temperature among the plurality of target cooling intensities are greater than the reference cooling intensities.
In Paragraph 12, The cooling control range of the cooling control map associated with a relatively high ambient temperature range among the plurality of cooling control maps above is, A battery management method that is extended or strengthened compared to the cooling control range of a cooling control map associated with a relatively low ambient temperature range among the plurality of cooling control maps above.

Description

Battery Management System and Battery Management Method The present invention relates to a cooling control technology for preventing prolonged charging caused by overheating of a battery pack while charging. This application is a priority claim application for Korean Patent Application No. 10-2024-0155533 filed on November 5, 2024, and all contents disclosed in the specification and drawings of said application are incorporated into this application by reference. Recently, as the demand for portable electronic products such as laptops, video cameras, and mobile phones has increased rapidly, and the development of electric vehicles, energy storage batteries, robots, and satellites has accelerated, research on high-performance batteries capable of repeated charging and discharging is actively underway. Currently commercialized batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium batteries. Among these, lithium batteries are gaining attention for their advantages, such as the ability to freely charge and discharge with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density. Various rapid charging technologies are being utilized to reduce the charging time of electric vehicle battery packs. Since the temperature of the battery pack tends to rise sharply during rapid charging, there is a high need to simultaneously cool the battery pack during charging. For cooling battery packs, a method is generally employed in which refrigerant is supplied to the inlet of a cooling network configured in the form of tubes, and the temperature of the refrigerant discharged through the outlet is lowered as it passes through the network before being recirculated to the inlet of the cooling network. However, conventional cooling methods maintain the flow rate and/or temperature of the refrigerant only at a constant, predetermined fixed value. According to conventional methods, the cooling intensity is insufficient to sufficiently cool the battery pack, so there is a high possibility that the battery pack will overheat even during refrigerant circulation. In addition, if the temperature of the battery pack exceeds a predetermined threshold, safety measures, such as forcibly reducing the charging speed, may be automatically executed to protect the battery pack from severe thermal damage, performance degradation, and fire hazards. If the charging speed is reduced, the charging time of the battery pack is inevitably extended. The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a schematic diagram showing the configuration of an electric vehicle including a battery management system according to one embodiment of the present invention. Figure 2 is a drawing referenced to explain an example of the coupling relationship between the battery block and the sensing unit shown in Figure 1. Figure 3 is a diagram referenced to schematically illustrate an example of the coupling relationship between a battery pack and a cooling network. Figures 4 and 5 are reference drawings used to schematically illustrate an example of the coupling relationship between a cooling network and a cooling circulation unit. Figure 6 is a diagram referenced to explain an example of charging status information of a battery pack during charging. Figure 7 is a diagram referenced to explain another example of charging status information of a battery pack during charging. Figure 8 is a diagram referenced to explain another example of charging status information of a battery pack during charging. FIGS. 9 to 11 are drawings referenced to illustrate exemplary cooling control maps according to the present invention. FIG. 12 is a flowchart referenced to schematically explain a battery management method according to another embodiment of the present invention. FIG. 13 is a flowchart referenced to illustrate an example of a set of routines that may be included in step S1220 of FIG. 12. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments