System structure overview EMUS BMS mini is a centralized battery management system that consists of a main controller and optional components that serve different purposes or amplifies the integrated ones. All of the populated pins and tabs of the main controller are described below:...
1. Connect BMS mini "Terminal (-)" with "-" of #1 Battery; 2. Connect BMS mini "Terminal (+)" with "+" of highest battery cell in a string; 3. Connector BAT1 has 9 pins and connects first 8 batteries of a battery pack. Connector BAT2 has 8 pins and connects remaining 8 batteries.
Wiring steps: 1. Connect BMS mini "Terminal (-)" with "-" of #1 Battery; 2. Connect BMS mini "Terminal (+)" with "+" of #7 Battery; 3. Connect wires from BAT1 connector to battery cells in a series. From lowest (#1) to highest (#7) potential.
Figure 2.3: Example system 36 V (10 battery cells) Connecting temperature sensors On the bottom of the BMS mini (refer to figure 2.5) there are five 2-pin connectors dedicated to external temperature sensors. External temperature sensor is shown in a Figure 2.4.
EMUS BMS mini to control it. The selection of a particular charging device should be done considering various aspects of the application, yet its output parameters are the most important from the battery management system’s point of view.
BMS will trigger ’Over-voltage’ protection and internal contactor will disconnect a charger, which will finish charging process. For this set-up firstly connect battery to BMS mini: connect "Battery (-)" to "Battery (-) terminal" and "Battery (+)" to "Battery (+) terminal" using power cables.
Non-CAN charger is presented. In this scenario Non-CAN charger is directly connected to the battery pack and controlled using low and high power relays. For this set-up firstly connect battery to BMS mini: connect "Battery (-)" to "Battery (-) Figure 2.7: Controlled Non-CAN charger installation diagram terminal"...
4.2. CAN charger is directly connected to a battery, but its control is performed over CAN Bus. Wiring diagram is shown in figure 2.9. Firstly connect battery to BMS mini: connect "Battery (-)" to "Battery (-) terminal" and "Battery (+)" to "Battery (+) terminal" using power cables. Now charger can be connected: using power cables connect "Charger (-) terminal"...
120 Ω terminating resistor would be applied to CAN Bus. Load installation On the left side of EMUS BMS mini (refer to figure 2.11) there are 2 power terminals: one is dedicated to connect battery and another one is for connecting load. Before connecting any device (load) you must power-up the BMS mini itself.
Battery tab. 3.1.2 Current Measurement EMUS BMS mini dual range integrated current sensor is an analog, hall-effect based current mea- surement device. The hall-effect measurement method also provides an inherent galvanic isolation between sensor ant the conducting part. There are two functionally identical types of the EMUS BMS mini dual range current sensor: internal and external.
3.2.1 Charge estimation State of Charge estimation in EMUS BMS mini is mainly based on the coulomb counting technique. The coulomb counting is done in sync with the current update process every newly determined momentary current value is multiplied by the update period, and the result, is accumulated as Battery Charge value (in Ah).
3.3.1 Using Non-CAN charging device Basic charging devices that do not have any EMUS BMS compatible interface for controlling their output current and voltage (also referred to as Non-CAN charging devices) are controlled by utilizing a special algorithm to turn them on an off using a switching device that is driven by a general purpose output pin mapped with ”Charger Enable”...
Maximum discharging current (continuous) — maximum allowed continuous discharging cur- rent. Battery Protections During charge and discharge EMUS BMS protects the battery cells from an operation beyond certain limits of its parameters: voltage, current, temperature. Description and configuration for each protection is described in the following chapters.
3.4.3 Charge Over-Current Protection Charge Over-Current protection disconnects charger contactor or disables charger itself if pin function "Charger enable" is activated whenever the measured charge current is above the threshold set by the corresponding "Activation Threshold” parameter value, thus preventing the high currents during regenerative processes from potentially damaging the battery cells.
Contactor pre-charge In a lot of different applications the battery that is managed by EMUS BMS connects to a load that has a substantial input capacitance. In such case, it is often desirable to limit the high in-rush current that occurs when the main contactor is closed in order to reduce stress to the internal components of the load device and prevent the contactor from welding.
2.4 GHz integrated wireless interface is designed to connect with smart-phones and PCs supporting the same wireless technology. "EMUS BMS mini" application has to be installed in order to connect BMS mini device used for information display and configuration. Smartphone acts as a CANopen client and communicates through EMUS BMS mini object dictionary.
Table are calculated based on the bit timing settings used in CAN-quipped Emus BMS Components, which were chosen according to the recommendations in CiA (CAN in Automation) 301 standard, and are optimal when nodes from different manufacturers are connected to the same CAN network.
Emus BMS components, therefore they should be connected to the bus either at its ends, or by branching the bus cable somewhere in the middle. When using the latter method, each wire of the branch cable, including the shield, should be connected to corresponding wire of the main bus cable by using a T connector, wire tap splices, or in the worst case, by soldering the wires together and covering them in heat-shrink tube.
Remappable GPIO Functions Description BMS mini supports remappable pins, which can be mapped with various different functions during configuration. The default function of one pin can be remapped onto another pin. These pins are also further divided into input and output categories. Each pin depending on its category has a set of standard and special mappable functions.
Figure 5.2: Input and output pin configuration: a) High voltage sensing input, b) Ground sensing input, c) High voltage output Configuration Using EMUS BMS mini mobile application each pin can be configured individually and effortless: In the main menu locate Configuration page Pin Functions tab;...
Analytics Statistics For diagnostic purposes, system keeps track of various pre-defined battery and BMS operation statis- tics and stores them internally. Each statistic, depending on its type, can consist of a corresponding main value, additional value, and a timestamp. A list of all statistics is provided in Table 6.1. Table 6.1: List of statistics and their descriptions Statistic Description...
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Over-voltage protection count The number of times Over-Voltage protection has been activated. Additionally contains the timestamp of the last occurrence. Discharge over-current protection The number of times Discharge Over-Current protection has been count activated. Additionally contains the timestamp of the last occurrence.
Events During operation, BMS keeps a log of the most recent events internally. It consists of 128 entries, each of which stores an event type identifier and occurrence timestamp. Once all 128 entries a filled, any new event replaces the oldest entry. All event types are described in the Table 6.2. Table 6.2: List of events and their descriptions Event Description...
Status Parameters Main BMS monitoring statuses and states are grouped into 4 groups. Each of the groups are described in the following lists. Battery group: State of Charge — indicates remaining charge in the battery pack. Measured in %. Energy Left — remaining energy in the battery pack. Measured in Wh. Total Energy —...
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Charging cycle count — count of charging times. Max. Charging current — Maximum registered charging current supplied by charging device. CAN charger connection state — presence of CAN charging device. Connected CAN charger model — CAN charging device model. CAN charger set voltage — voltage set for CAN charging device. Displayed as V. CAN charger set current —...
You can view it by clicking "View release notes" button. Device firmware can only be updated using user with administrative privileges. Follow these steps in order to update to the last available firmware version: 1. In EMUS mobile application navigate to Menu Update page. 2. Press button and wait until latest firmware file is downloaded.
"Login" Time and Date BMS mini system has it’s own time and date clock used to track exact occurrences of events and statistic values update. The time is displayed inside application menus or alongside related records. The main time details and configuration can be found in Profile menu -> Time window. This windows consist of these fields:...
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Item 1: displays current date and time that is known to BMS device. If "Time not set" or incorrect time is shown, it’s needed to be adjusted by pressing button (refer to Item 4). Set BMS time Item 2: displays uptime counter in seconds, started from device power up or restart. This indicates how long system is stable and correctly running.
Software Mobile application EMUS BMS mini is a freely available application for Android and in near future iOS devices, designed specifically for mon- itoring the battery status in an electric vehicle or energy stor- age application. Using this application, any smartphone or...
10.1.2 Electrical specifications Table 10.2: BMS mini Electric Specifications Item Value Number of cells 6 - 16 Battery cell voltage 1.000 V ... 4.950 V Battery pack voltage 12.0 V ... 67.2 V Operating temperature -40 C ... +80 C...
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