MAC Ebike Kit -- 50v Long Case Pack

This case is internally constructed using CNC cell holders and every cell in the pack has a fusible link. In the worst case scenario, the links will open and prevent a dangerous short circuit condition. These parts are all designed, developed and manufactured in-house using our Full-Size ATC CNC Router and our 40T Precision Stamping Machine. Very few battery packs are built with these safety features and we are only able to offer these features on a small scale because we have invested in the machinery to do it in-house. An extruded case with a cross-section of 75*110mm is used, with CNC end plates and a gland to avoid water ingress. Our 40A continuous rated BMS is fitted so if high power cells are used, this compact case can provide huge power, with short term bursts of 80A or more possible. The discharge cable uses the XT90-S connector to avoid sparks and to help avoid the problems that can occur unless a pre-charge is used.

Features:



Aluminium case with CNC plastic end plates.

Cable gland and end plates are sealed to offer good water protection.

In-House machined, CNC cell holders, to support the cells and hold the internal structure firmly within the case. High temperature insulating materials used throughout the pack, where necessary, to provide mechanical and electrical insulation.

Specially designed and in-house manufactured cell terminations, that provide minimal voltage drop for normal operation, but will instantly fuse if any cell in the pack is subjected to an extreme short circuit condition. This is a failsafe, last resort, safety feature. The BMS will trip and isolate the battery in the event of an external short circuit, the cell level fuses will only trip due to an internal short, or severe mechanical damage.

Includes a BMS with Over Charge, Over Discharge, Over Current and Cell Balancing (~4.17V Balance Voltage).

PPTC thermal fuses used on all BMS balance wires. If a fault were to ever occur on any of the small balance wires which run around the battery pack, the fuse simply disconnects the connection and keeps everything safe. Once the fault condition is removed, function returns to normal.

Oversized high temperature cables and Over-Rated connectors used throughout, so they don't get hot or melt.

Every Pack is capacity tested and the printout including the actual discharge data is included with every battery.



Specification:



We use 14S (50.4V, based on 14*3.6V), not 13S (46.8V nominal, based on 13* 3.6V) like most others, so that means a working voltage of over 48V most of the time and it also means that you're getting that much more capacity than you would have had with an equivalent 13S Pack (14S offers 7.7% extra capacity, versus a 13S equivalent with same Ah).

We conservatively rate the cells as 2.10Ah (22P), 2.45Ah (25R), 3.15Ah (32E) and 2.95Ah (30Q), although the maker classes them a little higher than this and our test results generally exceed these values. 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.

Cycle Life estimated at 500-700 cycles (to 80% Retained) with 100% Charge and 100% discharge cycles (which most would never normally do on every cycle). Cycle life is extended (possibly doubled) by charging to 90% and limiting discharge to 90%, so you use 80% of the available capacity (most, but not all of the time). We make it easy to control the Charge voltage with our switching charger (58.8V 5A and Satiator offers the option to charge to less than a full charge). To accurately limit discharge the Cycle Analyst is a great tool. Using continuous High Discharge Rates over the recommended levels will cause cell heating and can shorten cycle life.

Charge Voltage of 58.8V for 100% charger, 57.4V for 90% Charge (our 58.8V 5A NCM charger includes a switch to charge to 100%, 90% and 50%). The Satiator Charger allows the battery to be charged to any state of charge. Our small 58.8V 2A charger are very reliable and cost effective, but be aware that charging takes longer with just a 2A charge rate.

Maximum Charge Current 12A max (10A recommended, this is BMS limited).

Discharge Current, max recommended continuous discharge current ~21A (22P), ~24A (32E), 40A plus (30Q and 25R).

Dimensions: 75mm thick. 110mm wide and 330mm long (not including cable gland).