The start and stop system is a system that provides a vehicle to start and stop quickly for the purpose of fuel saving and environmental protection. In fact, the start-off system is a complete system,including generator, battery, start up motor, battery management system, and power management system. Compared with conventional vehicles without stopping, these conts are complete lyent star different in design, and are designed aroging current is very large, the start up, the generator's charglitable for high frequency start-up and the batter needs to be suitable to charge and discharge with a larger current .Among them, the battery is a vulnerable and the frequency of replacement is relatively high.
Can fuel vehicles replace lead-acid batteries with lithium-ion batteries to solve the problem of poor durability of starting batteries?
Drivers who believe that vehicle usage frequencyincreases after engine shutdown and battery replacement frequency also rises, have probably thought about this issue; but they may also wonderwhy "no" cars use lithium batteries instead of lead-acidbatteries
Actually, such statements are too absolute;many electric vehicles use 12V batteries that areithiumion batteries, and individuals using plugn hybrid cars also useiron-lithium 12V batteries,and even fuel-powered cars have been retrofitteclater on- so there is no such thing as 'absence'. Which battery type car manufacturers choose entirely depends on their planning for design and manufacturing cost investment, as well as their "environmental awareness.
01 Cost Difference Analysis;
The manufacturing cost oflead-acid batterie!was once the lowest, and the capacity standardfor automotive "Type Q" (starting battery) is relatively low, roughly divided into three levels Low:12V-35Ah,Medium:12V-45Ah,High:12V-55 Perhaps this parameter standard will make man car enthusiasts feeling credible. Will a car use a smallcapacity electric battery of 35 amps? The answer istrue, but it is mostly found in some of the more well-known joint venture brands of cars. The procuremencost of such electric batteries will of course be verylow, and the average price ofa brand new12V-75A batteries in the automotive parts market can also be controlled at about 350 yuan, which shows how lowthe cost of low-capacity batteries used in these vehicles is. However, some vehicles use 65-75Ah batteries, which actually have relatively high costs; thus, the reason for notupgrading to lithium-ion batteries is mainly that such technical planning was not made at the beginning of vehicle design. Engine compartment space layout, starter battery base design,
and the quality and other parameters of the battery pack are designed for lead-acid batteries. Switching to a lithium battery pack would have far-reaching consequences, making the upgrade far from straightforward.
Are lithium batteries really that expensive?
Actually, this view is also incorrect, as lithium batteries come in multiple types. These include lithium titanate, lithium cobaltate, nickel cobalt aluminum, nickel cobalt manganese, and lithium iron phosphate.
The manufacturing costs for the first four types are indeed high, as elements like titanium and cobalt are expensive. Cobalt prices are particularly volatile, since over 60% of global production comes from the Democratic Republic of Congo—an unstable African nation recently hit by severe volcanic eruptions, making cobalt supply and pricing even harder to control.
This is why some suppliers and automakers are researching cobalt-free batteries, though cost control remains a significant challenge. Consequently, such ternary lithium batteries are unsuitable for use in gasoline-powered vehicles.
Key point: Lithium iron phosphate batteries can fully replace lead-acid batteries because their manufacturing costs are very low, the general standards are as follows: 3.2–3.7V 55Ah ≤ 120 yuan, 3.2–3.7V 72Ah ≤ 150 yuan.
When batteries are connected in series,“capacity remains unchanged”while“voltage increases.”Therefore, connecting just four iron-lithium batteries in series can meet the v oltage requirements for automotive use;the cost for a medium-capacity battery does not exceed 500 yuan.
This is precisely why national standard e-bikes are upgrading to LiFePO₄ batteries. After all, LiFePO₄ batteries offer several times the energy density of lead-acid batteries,meaning they deliver equivalent range with smaller size and lighter weight. For vehicles, this represents a lightweight, fuel-efficient solution. In the coming years, more vehicles will inevitably adopt this battery technology.
What are the advantages and disadvantages of lithium iron phosphate starter batteries?
The drawback of LiFePO₄ used to be their high cost, but iron-lithium batteries have perfectly avoided this issue.
Advantages of LiFePO₄ batteries include: high safety, extended lifespan, and low curb weight.
High-standard LiFePO₄ batteries have undergone“needle puncture short-circuit tests”by at least two brands; this means even when pierced by a steel needle, the battery neither ignites nor generates significant heat. The tested low-density batteries outperform lead-acid batteries, while high-density variants reach 140Wh/kg.
Lead-acid batteries have a short lifespan, typically failing after about 350 full charge-discharge cycles. Each cycle causes sulfation of the plates, where partially irreversible lead sulfate crystals adhere to the plates, significantly reducing the efficiency of active material reactions. Once severe sulfation occurs, the battery can no longer be recharged, ending its service life.
LiFePO₄ batteries are generally believed to develop“issues”after 1,000 to 2,000 full charge-discharge cycles, as electric vehicle manufacturers often cite this figure in their analyses. However, the actual concept is that after approximately 2,000 full cycles, the battery capacity will decrease by 20% to 30%.