Model-free quantitative diagnosis of internal short circuit for lithium
Multi-fault diagnosis for series-connected lithium-ion battery pack with reconstruction-based contribution based on parallel PCA-KPCA Appl Energy, 324 ( 2022 ), Article 119678, 10.1016/j.apenergy.2022.119678
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Management of imbalances in parallel-connected lithium-ion battery packs
This paper investigated the management of imbalances in parallel-connected lithium-ion battery packs based on the dependence of current distribution on cell chemistries, discharge C-rates, discharge time, and number of cells, and cell balancing methods. Experimental results show that the maximum current discrepancy between cells during
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Design of Controlled Charging Strategy for Parallel Operation of
An adequately engineered parallel modular battery pack system can improve overall reliability and safety. This paper uses a voltage-controlled bidirectional controller to mitigate the problems associated with the parallel connection with minimized complexity. As claimed by the results of the simulated controlled parallel modular battery pack
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Parallel battery pack charging strategy under various ambient
In this paper, in terms of the fast charging strategy of parallel battery packs, an appropriate model should be established to control side reactions under various ambient temperatures, so as to prevent side reactions. Firstly, the cell model was established by coupling the SPMe, degradation model and thermal model. Then, considering the
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Impact of Individual Cell Parameter Difference on the Performance
When cells are connected in parallel, the difference in Ohmic internal resistance between them causes branch current imbalance, low energy utilization in some individual cells, and a sharp expansion of unbalanced current at the end of discharge, which is prone to overdischarge and shortens battery life.
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Active equalization for lithium-ion battery pack via data-driven
In the text of global warming and shortage of fossil fuels, electric vehicles (EVs) have been seen as a promising alternative for conventional vehicles and become extremely popular in the recent years (Chen et al., 2022; Abu et al., 2023; Han et al., 2023) nsidering the limited voltage and capacity of one single lithium-ion battery cell, hundreds to thousands of
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Parallel battery pack charging strategy under various ambient
In this paper, in terms of the fast charging strategy of parallel battery packs, an appropriate model should be established to control side reactions under various ambient
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Switched‐Resistor Passive Balancing of Li‐Ion Battery
Balancing the charge on a battery pack connected in series and parallel is crucial due to manufacturing discrepancies and distinct performance of each cell in a standard battery pack. In this paper, a switched-resistor passive
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Integrated balancing method for series‐parallel battery
To reduce the inconsistency of battery packs, this study innovatively proposes an integrated active balancing method for series-parallel battery packs based on LC energy storage. Only one inductor and one
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Degradation in parallel-connected lithium-ion battery packs
Degradation in parallel-connected lithium-ion battery packs under thermal gradients cells were initially charged using a CC-CV charging protocol (1 C charge to 4.2 V, current cutoff of 0.01 C
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Integrated balancing method for series‐parallel battery packs
To reduce the inconsistency of battery packs, this study innovatively proposes an integrated active balancing method for series-parallel battery packs based on LC energy storage. Only one inductor and one capacitor are used to store energy to achieve the balance of each cell in a series-parallel battery pack. This design has the characteristics
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Study of the Characteristics of Battery Packs in Electric Vehicles
Abstract: This paper studies the characteristics of battery packs with parallel-connected lithium-ion battery (LiB) cells. To investigate the influence of the cell inconsistency problem in parallel-connected cells, a group of different degraded LiB cells were selected to build various battery packs and test them using a battery test bench.
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Analysisandestimationofthemaximumcirculatingcurrentduringthe
Thanks to the emerging technique of battery system reconfiguration, the originally series-connected batteries are possible to be reconnected in parallel. Then, the charge imbalance
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Optimal fast charging strategy for series-parallel configured lithium
This novel strategy has been validated on a commercial battery pack configured in three-parallel six-series (3P6S), showing an impressive charged capacity increase of 39.2 % in just 10 mins and 92.2 % in 53 mins at 25 °C, surpassing previous charging protocols. Impacts on pack parallel and serial branch resistances on pack charging performance
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Management of imbalances in parallel-connected lithium-ion battery packs
This paper investigated the management of imbalances in parallel-connected lithium-ion battery packs based on the dependence of current distribution on cell chemistries, discharge C-rates, discharge time, and number of cells, and cell balancing methods. Experimental results show that the maximum current discrepancy between cells during discharge occurs
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Application of different charging methods for lithium-ion battery packs
The results suggested that a Series configuration ACSC with relays that enable and disable the cells with upper voltage thresholds is the fastest method for charging SLB efficiently. However, Parallel connection was the technique that could reduce the voltage deviation. Despite that, the six methods are suitable for charging the SLB, and the application
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Analysisandestimationofthemaximumcirculatingcurrentduringthe
Thanks to the emerging technique of battery system reconfiguration, the originally series-connected batteries are possible to be reconnected in parallel. Then, the charge imbalance issue can be mitigated by taking advantage of the self-balancing effect during parallel operation.
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Bidirectional Active Equalization Control of Lithium Battery Pack
As shown in Figure 1, taking the series-connected lithium battery pack equalization unit composed of Bat1, Bat2, Bat3, and Bat4 as an example, each single battery is connected to four switching MOS tubes to form a bidirectional energy transfer circuit, and each MOS tube is connected in parallel with a current-continuing diode, which turns on the
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Multi-fault diagnosis of lithium battery packs based on
Failure design schematic for series-connected lithium-ion battery packs. The battery pack consists of eight 18,650 Li-ion ternary batteries connected in series, each with a rated capacity of 2.3 Ah. The specifications of the batteries are shown in Table 3, and the experimental apparatus is illustrated in Fig. 5. Table 3. Battery parameters. Argument Value;
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A comparison of battery-charger topologies for portable applications
The battery pack may include cells connected in series to achieve a higher voltage, and/or cells connected in parallel to achieve a higher capacity. The pack configuration directly imposes specific charger requirements, such as charging voltage and current. In addition to these factors, inside a battery-powered device, a charging source must be identified to replenish the battery
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A Review on Fast Charging/Discharging Effect in Lithium-Ion
In EVs, battery cells are connected in series and parallel combinations to generate the required power with heat during charging/discharging. Thus, it is essential to maintain a temperature range of 25–40 °C and extract the additional heat generated within the battery. Researchers have suggested that high Depth of Discharging (DOD) and charging
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Application of different charging methods for lithium-ion battery
The results suggested that a Series configuration ACSC with relays that enable and disable the cells with upper voltage thresholds is the fastest method for charging SLB
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Management of imbalances in parallel-connected lithium-ion
This paper investigated the management of imbalances in parallel-connected lithium-ion battery packs based on the dependence of current distribution on cell chemistries,
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A novel active cell balancing topology for serially connected Li-ion
In a Battery Management System (BMS), cell balancing plays an essential role in mitigating inconsistencies of state of charge (SoCs) in lithium-ion (Li-ion) cells in a battery stack.
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Switched‐Resistor Passive Balancing of Li‐Ion Battery Pack and
Balancing the charge on a battery pack connected in series and parallel is crucial due to manufacturing discrepancies and distinct performance of each cell in a standard battery pack. In this paper, a switched-resistor passive balancing-based method is proposed for balancing cells in a battery management system (BMS).
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Design of Controlled Charging Strategy for Parallel Operation of
An adequately engineered parallel modular battery pack system can improve overall reliability and safety. This paper uses a voltage-controlled bidirectional controller to mitigate the problems
Get a quote
Study of the Characteristics of Battery Packs in Electric Vehicles
Abstract: This paper studies the characteristics of battery packs with parallel-connected lithium-ion battery (LiB) cells. To investigate the influence of the cell inconsistency
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Impact of Individual Cell Parameter Difference on the
When cells are connected in parallel, the difference in Ohmic internal resistance between them causes branch current imbalance, low energy utilization in some individual cells, and a sharp expansion of unbalanced
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Parallel battery pack charging strategy under various ambient
Charging strategy for parallel battery pack is adopted to prevent side reactions. Electrochemical energy storage; Mechanical engineering; Energy Systems; Energy materials . Introduction. As the aggravation of environmental pollution and energy crisis, the use of new energy has become a hotspot, such as new energy vehicles and energy storage systems.
Get a quote6 FAQs about [Lithium battery packs connected in parallel to prevent mutual charging]
What is the charging capacity of a parallel battery pack?
For charging time, the charging capacity of the parallel battery pack is 20.50 Ah in 1964 s, which is equivalent to charging the battery pack at a constant current of 37.58 A (i.e., 1.25C). In addition, the effect is significantly better than the fast charging of CC-CV of 1C.
What happens if a lithium-ion battery is connected parallel?
Uneven electrical current distribution in a parallel-connected lithium-ion battery pack can result in different degradation rates and overcurrent issues in the cells. Understanding the electrical current dynamics can enhance configuration design and battery management of parallel connections.
How does a parallel battery pack work?
In other words, for a parallel battery pack, the initial input total current is the current of a cell multiplied by the number of branches. At the same time, as the charging process goes on, the overpotential will decrease, requiring subsequent control.
Why is the current distribution of a parallel battery pack difficult?
Compared to series battery packs, the current distribution of each branch for parallel battery pack is very inconsistent and complicated because of the resistances caused by the wire and welding ( Hosseinzadeh et al., 2021; Wu et al., 2021 ).
What is a parallel-connected battery pack?
3.4.2. Individual Cell Battery Parallel into the Battery Pack For a parallel-connected battery pack, the negative feedback formed by the coupling of parameters between individual cells can keep the current stable before the end of charge and discharge.
What causes a parameter difference in a battery pack?
(13) The parameter difference of the battery pack is caused due to the complex charging and discharging environment, temperature, and other external factors in the process of use, combined with differences in the capacity, internal resistance, and self-discharge rate of the individual cells in the manufacturing process.
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