Design and development of less than 1Kw Lithium rechargeable battery pack

이상범,이상현 한국인터넷방송통신학회 2018 International Journal of Internet, Broadcasting an Vol.10 No.3

Lithium-ion batteries have been used in energy storage systems (ESS), electric vehicles (EVs), etc. due to their high safety, fast charging and long lifecycle. This paper aims to improve the convenience of users by changing the wired battery stack used in the battery pack, wirelessly using RFID, reducing the internal volume of the battery pack, reducing the size of the battery pack. In this paper, we propose a battery management system which can provide the flexibility of battery pack expansion and maintenance by using lithium ion battery, battery management system (BMS) and wireless communication for light weight of 1Kw small battery pack. Also, by flexibly arranging the cell layout inside the battery pack and designing to reduce the size of the outer shape of the battery pack.

Design and development of less than 1Kw Lithium rechargeable battery pack

Kim, Sang-Bum,Lee, Sang-Hyun The Institute of Internet 2018 International Journal of Internet, Broadcasting an Vol.10 No.3

Lithium-ion batteries have been used in energy storage systems (ESS), electric vehicles (EVs), etc. due to their high safety, fast charging and long lifecycle. This paper aims to improve the convenience of users by changing the wired battery stack used in the battery pack, wirelessly using RFID, reducing the internal volume of the battery pack, reducing the size of the battery pack. In this paper, we propose a battery management system which can provide the flexibility of battery pack expansion and maintenance by using lithium ion battery, battery management system (BMS) and wireless communication for light weight of 1Kw small battery pack. Also, by flexibly arranging the cell layout inside the battery pack and designing to reduce the size of the outer shape of the battery pack.

Design and development of less than 1Kw Lithium rechargeable battery pack

Sang-Bum Kim,Sang-Hyun Lee 한국인터넷방송통신학회 2018 International Journal of Internet, Broadcasting an Vol.10 No.3

Lithium-ion batteries have been used in energy storage systems (ESS), electric vehicles (EVs), etc. due to their high safety, fast charging and long lifecycle. This paper aims to improve the convenience of users by changing the wired battery stack used in the battery pack, wirelessly using RFID, reducing the internal volume of the battery pack, reducing the size of the battery pack. In this paper, we propose a battery management system which can provide the flexibility of battery pack expansion and maintenance by using lithium ion battery, battery management system (BMS) and wireless communication for light weight of 1Kw small battery pack. Also, by flexibly arranging the cell layout inside the battery pack and designing to reduce the size of the outer shape of the battery pack.

Physical Treatment of Non-battery Components from Spent Battery Pack in Electric Vehicles

( Jeong-soo Sohn ),( Hong-in Kim ),( Dong-hyo Yang ),( Soo-kyung Kim ),( Kwang-hyun Bae ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-

The lithium-ion batteries used in electric vehicle are composed of one pack. This pack is composed of several modules and each module is composed of several cells. The weight of battery pack is above 200 kg but the weight percent of cell is only 60%. The other 40% is not lithium-ion cells but another components such as BMS(battery management system), PRA(power relay assembly), safety plug, cable, cooling system and pack case. Recycling technologies for valuable metals such as cobalt, nickel, manganese and lithium are now commercialized but non-battery components in battery pack of electric vehicles are not fully recycled. In order to complete the recycling of spent battery pack in electric vehicles, recycling of non-battery components is necessary in addition to lithium-ion cell recycling. So in this study, we introduced the physical treatment processes such as dismantlement, crushing, grinding, magnetic separation and size separation for non-battery components recycling. Some of nonbattery components are plastic materials and the others are plastics mixed with metals. These non-battery components are too bulky to transport and sometimes metal components should be separated from the plastics. After dismantling the spent battery pack, each parts were treated by shredder. Volume changes of each non-battery component wastes were measured before and after shredding and volume reducing ratio was examined. Also in the case of plastics mixed with metals such as BMS, PRA and cooling system, the separation between metal and non-metal was examined after crushing, size separation and magnetic separation.

전기자동차 직접 충전기술 동향 분석 및 고전압 배터리팩 설계기술 검토

나석진(Seok-Jin Na),김범준(Beom-Jun Kim),조인호(In-Ho Cho) 전력전자학회 2023 전력전자학회 논문지 Vol.28 No.3

The existing electric vehicle was released with a 400 V battery pack. Assuming that a battery pack of 80 kWh is made, a capacity of 200 Ah should be used for a 400 V battery pack. However, when using 200 Ah, the thickness and power loss of the wiring due to the current increase, and the heat generation loss also increases. To overcome this limitation, vehicles equipped with 800 V battery packs are recently being released. When the 800 V battery pack is mounted, the capacity is reduced by half, that is, 100 Ah, thereby reducing the thickness of the wiring, power, and heat generation loss and improving mileage and performance. Furthermore, the charging time caused by the rise in charging voltage is shortened, and the heat generation is reduced, simplifying the cooling system. Many studies have recently been conducted to increase the battery pack voltage to a high voltage of 800 V or higher. However, various considerations arise when designing a high-voltage battery pack, and this paper examines the voltage specifications of EV chargers and battery packs, analyzes the structure of battery packs that change to high voltages, and discusses high-voltage battery pack design technologies and considerations.

공랭식 배터리 팩 모듈의 채널 리브 형상에 따른 냉각 효율 향상 연구

김종민(Jong Min Kim),김흥규(Heung-Kyu Kim),장시열(Siyoul Jang) 한국자동차공학회 2023 한국 자동차공학회논문집 Vol.31 No.4

Precise temperature control in battery packs is critical for battery-operated vehicles such as electric and hybrid vehicles. In general, an air-cooled battery pack for a hybrid vehicle is closely packed with many battery modules that encapsulate several battery cells. The internal space design of the air-cooled battery pack for better air flow directly influences the cooling efficiency of the battery pack. Among the design shapes that influence the cooling efficiency of the battery pack, rib shapes are selected for the cost effective enhancement of cooling performance. The entire detailed space for cooling air passages in the battery pack is modeled for the FEM temperature and pressure development analysis. Rib designs of battery module are suggested for the best air cooling efficiency, and several designs are compared with respect to the small temperature rise and less pressure drop in the air-cooled battery pack. Based on the rib size analysis, the flow rate deviation value and temperature uniformity were improved by up to 86.36 % and 90 %, respectively. However, the flow space inside the air channel decreased, as shown by the 29.43 % decrease in pressure drop value.

자체 제작된 리튬이온 배터리팩의 과충전에 따른 화재위험성 연구

한용택,김일원,김시국 한국위험물학회 2022 한국위험물학회지 Vol.10 No.1

Lithium-ion battery packs are used in various electronic devices such as camping batteries, electric kickboard, and supplementary battery due to their high volumetric energy storage density. Recently, however, as more and more people make and use outdoor lithium-ion battery packs such as hiking, fishing, and camping, there is a battery fire while charging their own battery packs. This paper investigated the operating principle of these battery packs and conducted a study on the fire risk caused by overcharging in the presence or absence of lithium-ion batteries with the same capacity, lithium-ion batteries with different capacity, and PCM(Protection Circuit Module). As a result of the overcharging experiment, the battery pack was completely destroyed combustible gas and smoke generation near the lithium-ion battery anode of the battery pack without a protection circuit, followed by explosive combustion accompanied by flame. Vent and safety devices(PTC, CID) could be observed to have been lost due to overcharging explosion pressure.

Design of Temperature Control Battery Pack of Electric Vehicle using PCM Thermal Characteristics

Kyoojae Shin 대한전자공학회 2021 IEIE Transactions on Smart Processing & Computing Vol.10 No.6

This paper is about the thermal management of an electric vehicle battery pack with phase change materials. The battery pack safe operating temperature is 25 to 40°C. Under extreme conditions, the battery pack of electric vehicles will generates high heat during operation, so for this we proposed a thermal management of with phase change materials(pcms). At high heat genartion conditions, pcms will observe heat from battery pack. In addition, in extreme cold temperatures of zero degrees pcm will give warmth to battery pack. In this study, we analyzed the PCM properties and evaluated the hysteresis properties for effective heating and cooling of the battery pack. In order to perform optimal temperature control of the battery pack, a BTMS was designed and fabricated using the thermal characteristics of EG28 and EG26 PCMs and an optimized hysteresis PID control method. The proposed temperature control system was confirmed to be excellent through experiments.

Plenum의 공간 형상에 따른 공랭식 배터리 팩 냉각 유동 성능 연구

이건희,장시열 한국자동차공학회 2023 한국 자동차공학회논문집 Vol.31 No.5

The cooling of battery packs is essential for eco-friendly vehicles that use lithium-ion batteries to ensure long life and stability. Among the battery pack cooling methods, the air-cooling method has a small heat capacity, but it is economical, low in weight, and easy to maintain. It is important that the cooling performance of the air-cooled battery pack achieves uniformity in terms of air flow rate supplied to each air channel. In the air-cooled battery pack, the plenum forms appropriate pressure to supply uniform cooling air to each air channel. Therefore, the cooling performance is highly dependent on the spatial shape of the plenum. The plenum of the air-cooled battery pack is divided into a Divergence plenum, which supplies air to each air channel, and a Convergence plenum, which is the space flowing in from the air channel. Depending on the flow path, air-cooled battery packs can be called Z-type and U-type expressions. This research compared and analyzed the results(air flow rate, cell temperature, and pressure drop) based on the combination of the shape differences of the plenum in the air-cooled battery pack, whether its flow path is that of the Z-type or the U-type. Accordingly, it is expected to present a plan for designing a plenum space, depending on the flow type of the air-cooled battery pack.

IMPLEMENTATION OF DISCHARGING/CHARGING CURRENT SENSORLESS STATE-OF-CHARGE ESTIMATOR REFLECTING CELL-TOCELL VARIATIONS IN LITHIUM-ION SERIES BATTERY PACKS

C. Y. CHUN,B. H. CHO,J. KIM 한국자동차공학회 2016 International journal of automotive technology Vol.17 No.5

This paper offers novel insights to the design and implementation of an innovative state-of-charge (SOC) estimator for the lithium-ion (Li-Ion) series battery pack. The most interesting feature of this approach is that it can utilize information from each filtered terminal voltage of the Li-Ion cells connected in series for SOC estimation of the battery pack. Without actual sensing each discharging/charging current (DCC) applied to the Li-Ion cells, it is possible to extract each DCC estimation from the corresponding filtered terminal voltages with an equivalent electrical circuit model (EECM) identification of all Li-Ion cells in the battery pack. There are two advantages to SOC estimation of the battery pack with this approach. First, the proposal can be implemented simply and effectively, reducing the computational steps required for SOC estimation. By reducing computational steps, the proposal is expected to be more cost-effective. Second, the approach guarantees an improved SOC performance, even if the battery pack results in inevitable cell-to-cell variation among Li-Ion cells. Accordingly, there are fewer differences to previously estimated DCCs among Li-Ion cells. Specifically, all values from the estimated DCCs are properly compensated for by simultaneous parameter modification according to each cell’s electrochemical characteristics. Experimental results clearly demonstrate that our DCC sensorless SOC estimator provides robust SOC performance for the battery pack. This approach considered an experimental battery pack (12S1P) connected in series using 2.6 Ah LiCoO2 cells produced by Samsung SDI.