Rhino 52-750 Ebike Battery 52V (14S3P) 21700 From EM3ev

Description

We finally did it, it wasn’t easy, but we finally developed our  Rhino 52-750 Ebike Battery with 42pcs of 2170/21700 cells, and we did it right. This a big step forward in every way from the original EM3ev 18650 rectangle batteries. Using the knowledge and experience we have gained over the years, we have made an even safer battery, if not the safest ebike battery on the market, with better energy density, with better fusible nickel terminations and an interconnect PCB (with fusing). Each battery is fitted with special foam that will prevent thermal runaway.

In making our new Rhino 52-750 Ebike Battery we also created a new, smarter BMS, with great logging capabilities, with high current, that fits in a tiny footprint. In fact, without the new custom BMS layout/dimensions, there would be no way to fit 42 cells in this case (at least not with reasonable cell to cell spacing anyway).

The battery will come with a discharge lead adaptor, or discharge tail. We offer XT90-S, XT60, Anderson Powerole or 4mm gold bullets.

So why is the Rhino 52-750 Ebike Battery, a step-change and why is the latest Rhino Rectangle Family from EM3ev a cut above the rest?

This is why:

• We assemble ALL our batteries in our factory, using custom parts we design and then manufacture on our own CNC machines. We don’t buy from Battery Pack Assemblers that sell at the lowest price to attract buyers, but then have to scrimp on everything, then assemble them as quickly/cheaply as possible, so they turn a profit. We don’t take chances when it comes to our batteries or your safety!
• We only source genuine A-grade genuine cells from the official sources.
  

  The safest battery

  Every cell in the pack is fused (just like almost all of the batteries we supply). We have been designing and manufacturing (in-house) our own battery terminations for several years already. Cell level fusing, means that in the event of an internal short circuit in the battery (which the BMS cannot protect against), then all that will happen is that some sacrificial links will safely open, preventing any of the cells or cabling from overheating and becoming dangerous. CNC spot welding ensures consistent weld quality and weld position. Finally, our new PCB design offers better internal cable management and routing. Safe by design!

• Our special fire-resistant foam ensures that even in the low, low-probability event of a thermal cell issue you’re still protected. Our batteries have truly changed the game when it comes to safety.
• The Rhino 52-750 Ebike Battery case is custom built and designed for 42 cells (the case itself is custom designed in-house by our team of experts). Each aluminium case is anodised to ensure corrosion and wear resistance. What you end up with is an extremely strong case that looks great.
• Our Rhino 52-750 Ebike Battery uses an in-house designed and manufactured CNC cell holder which keeps everything safe, solid and secure.
• Every cell in the pack is fused (just like almost all of the batteries we supply). We have been designing and manufacturing (in-house) our own battery terminations for several years already. Cell level fusing, means that in the event of an internal short circuit in the battery (which the BMS cannot protect against), then all that will happen is that some sacrificial links will safely open, preventing any of the cells or cabling from overheating and becoming dangerous. CNC spot welding ensures consistent weld quality and weld position. Finally, our new PCB design offers better internal cable management and routing. Safe by design!
• We use a high tech, fully programmable UL-certified Smart BMS, which is rated for genuine 40A continuous plus, with a programmable over-current trip set to >50A (which is ample for the intended application). Our BMS balances during charging (when charging and when at >50% charge) and therefore doesn’t require a full charge in order to balance. Auto power off function, auto power on and with a pre-charge function (no sparks, so long as the battery is powered off when linked to the controller).
• This is a 3-wire BMS with separate charge and discharge circuits. The charge port doesn’t not output the battery voltage and will avoid sparking if you forget to power on your charger prior to connecting it.
• We do have a battery parallel balancing device that can be used for running two batteries in parallel under all edge cases. The battery parallel balancing device works from 10S (36V) to 14S (52V). As long as the voltages of the two batteries are the same – eg. both are 14S etc. it will work with all cell types and capacities. The device has a max discharge current of 60A and regen is not permitted. Please contact us if you are interested in this device.
• High current charge plug comes as standard (approx. 8A rated). We don’t use the standard DC2.1 connector, that is only rated for 3A and is likely to melt at not much more than that. We would recommend a max of 2.5A for the DC 2.1 connector.
• We do all this and offer it at our usual low pricing, we don’t charge a premium for Safety and Reliability. Just because we offer low prices, it doesn’t mean we don’t stand behind our product if there is an issue. We have a proven track record of offering great after-sales support and warranty repairs/replacements. We will not leave you stuck (1 year Warranty, with several Support Centres World-Wide). Our batteries are designed to be easily repaired if the need arises.

Features of Rhino 52-750 Ebike Battery Case:

• The Rhino 52-750 Ebike Battery case is designed for 42 cells, including cell holder and BMS. We design and manufacture the CNC cell holder, so it is a snug fit inside the case.
• We have designed and manufactured custom terminations for this layout, with cell level fusing on every cell, whilst also minimising voltage drop, to make the Rhino 52-750 Ebike Battery 1 of the safest Ebike Batteries on the market (regardless of price).
• We have fitted 1 of the most advanced BMS you will find in any Ebike Battery to keep the battery safe, performing 100%, to be reliable for the long-term and to give the user access to data for info and diagnosis.
• Our Rhino 52-750 Ebike Battery comes with a high current charge plug, rated for around 8A.

A little info about EM3ev and their Batteries

EM3ev builds battery packs (and design/manufacture most of the key component parts on our own high-tech machines). We have been assembling all our own battery packs since around 2011. We build our own battery packs, as we want to do things right, we want to do everything we can to make our batteries safe and we want to innovate. EM3ev packs are always conservatively/accurately rated with regards to both their capacity and the discharge current they can provide, which will help to ensure our packs provide a long and reliable service life.

On top of all this, we stand behind our products (1 year warranty). And WE WILL fix any issues that occur (with minimum inconvenience, no cost to the customer and no we do not ask customers to return parts to China!). Here at EM3ev, we are not about hype, spin and self-promotion, our reputation was built the old fashioned way, by happy/satisfied customers.

Rhino 52-750 Ebike Battery Specs:

• 58.8V 2A (fan-less) or, 4A, 5A and 6A chargers are optional extras. These are good quality chargers (very reliable in our experience). (The charger may differ from the images shown).
• We conservatively rate the cells as 5Ah per cell.  Although the makers classes them a little higher than this. Like with any Li Ion type battery, best long term performance is obtained by not using all of the available capacity all of the time, and also, by not using the pack at high discharge rates which will cause excessive cell heating and premature aging.
• Cycle Life estimated at 500-700 cycles plus (1C discharge to 2.75V, 1C charge to 4.2V). Cycle life is extended by charging to 90%, limiting discharge to 90%. Our 6A charger has a switch for either ~30%, ~80% or 100% charge, or choose the Satiator for even more control. Our BMS doesn’t need a full charge to balance the pack, it will happily balance the pack with only 80 or 90% charge.
• Cycle Life will be reduced if the Pack is regularly used at continuous high discharge rates (our BMS does have over-temp protection if the battery gets too hot). Therefore, please match the battery pack to the rest of the kit to get the performance and long term usage you expect (see our suggested max discharge current below, for our recommendations).

Recommended Max Discharge Current for each Cell Type of the Rhino 52-750 Ebike Battery 52V Ebike Battery:

• Samsung 50GB: ~30A Continuous, 40A Max Burst Current

Please note we recommend a controller current rating (battery or rated current) of no more than 30A for this battery. Ignore the phase amp controller rating and go by the controller’s battery or rated current. The trip current is set to 50A for 1 second. 

Note: the cell manufacturers specs are higher than our recommendations above. It will not harm the battery to occasionally discharge at higher levels than our recommendations, but regular, sustained high discharge rates will degrade the battery more quickly and the battery voltage will sag at these high power levels. The Battery BMS is programmed to trip if cell temperatures reach 60degC during discharge and 45degC during charging.

Capacity Specs for each Cell Type of the Rhino 52-750 Ebike Battery 52V Ebike Battery:

• Samsung 50GB; 50.4V nominal, 15Ah, ~756Whrs

Note: the above figures are on a new battery in warm weather and at a discharge rate of ~0.5C. Cold temperatures or high discharge rates will result in reduced capacity. Capacity will degrade over time and usage. 52V batteries are not actually 52V. They are 50.4V as they use 14 series of 3.6V nominal cells (14*3.6V = 50.4V).

Rhino 52-750 Ebike Battery Weight and Dimensions:

• Maximum dimensions of: 158*81*220mm.
• Weight: approximately 4.5kg.