GWL BMS EasyT
Technical Specification
Product description
The module for protection of a battery cell or a cell block against overheating. The EasyT modules can be functionally connected together with the EasyV modules to create basic protection for 12, 24, 48 V etc. One or two thermal sensors can be connected to one EasyT module.
- Simple, durable, and reliable electrical design (without SW)
- Simple wiring and installation of the module
- Output galvanic isolation (bistable relay)
- Galvanically isolated input for common reset of modules (optocoupler)
Possibilities of use
- Basic protection for simple systems (backup power, caravans, huts...)
- Duplicate (backup) protection for advanced BMS systems
- Duplicate warning system for control systems
- Meets the condition of an automatic shutdown on failure without software elements
- In combination with the BMS Easy module, it meets the basic requirements of the IEC 62619 standard for battery system protection
Feature description
If the temperature of the monitored cell or cell block is below the specified operating maximum, the output relay of the module is connected in the COM - NO position and the signal LED flashes at an interval of about 3 s. If the temperature rises above the permissible limit, the relay switches to the COM - NC position and the LED does not flash.
WARNING: If the power supply is interrupted, the relay will not switch to the COM - NC position.
Temperature sensors
The EasyT uses PT1000 temperature sensors to sense temperature, which can be placed anywhere in the battery pack. GWL recommends placing the sensors on the terminals or jumpers of the battery packs. The basic wire length (0.5 m) of the PT1000 can be adjusted as required without affecting the measured values.
WARNING: If only one sensor is used, the second unused sensor input must be short-circuited.
Outputs description, basic diagram
A circuit board with labeled terminals for DC power supply, reset button, LED indication, temperature sensors, and control signals (COM, NC). It shows connections for a protected battery pack via temperature sensors and a reset voltage impulse input.
Technical specification
| Input / Output / Features / Property | Value | Note |
|---|---|---|
| Operating (supply) voltage | 4.5 – 30 V | Above 30 V the fuse will switch off |
| Self-consumption | Max. 8 mA | With power supply voltage up to 24 V and current up to 6 mA |
| Relay switching at Tmax. | Up to 55°C | The typical shutdown value is 55°C, 55°C is the maximum temperature at which the module must shut down. |
| Max. switching power of the relay | DC 30 V / 1 A DC 60 V / 0.5 A DC 200 V / 0.1 A | Do not use for direct switching of power contactors |
| Dielectric strength of the relay | 1000 Vrms | |
| Switching on the board or resetting after Tmax passed | The button on the board or with remote signal reset | Press or use signal min. 3 s, max. 60 s |
| Status indication - board on | Green LED | Flashes after 3 s |
| Status indication - board off | Green LED | Does not flash, does not light |
| Board dimensions | 60 x 40 x 23 mm | 23 mm (height of the board including components) |
| Weight | 22 g | |
| Type of temperature sensor | PT 1000 | The basic line length is 0.5m, it can be extended |
| Maximum voltage between the temperature sensor and board power | 500 V | |
| Remote reset/start input voltage | 9 – 200 V | DC, AC |
| Relay consumption during start/reset pulse | 7.3 mA |
Examples of use
BASIC WIRING OF EASYV AND EASYT MODULES FOR VOLTAGE AND TEMPERATURE PROTECTION OF A 12V BATTERY
A wiring diagram showing the connection of battery cells to voltage protection and thermal protection modules. It illustrates the protected output and the power supply for starting or resetting the EasyT module. Key components like contactor KM1, fuses FU1, FU2, FU3, and switch S1 are indicated.
If a cell goes out of the allowed voltage range or the temperature of the cell block exceeds the allowed temperature, the relay on the corresponding Easy module switches to the NC position, and contactor KM1 loses voltage on the coil and disconnects the power.
WARNING: The EasyT module must be powered from the protected output so that it is not further discharged by the EasyT module's own consumption after the battery is disconnected at U min. Resetting or starting the module must be done simultaneously using the button on the board and the auxiliary button S1.
WARNING: If the switching load on the coil of the power contactor is greater than the switching capability of the relays on the Easy modules, an auxiliary relay with the necessary contact parameters must be added to the system. The inductive nature of the load must also be taken into account.
BASIC BATTERY CELL PROTECTION ACCORDING TO IEC 62619 WITH AN EXTERNAL SOURCE OF THE CONTROL CIRCUITS
A schematic illustrating basic battery cell protection according to IEC 62619 using an external source for control circuits. It depicts a battery pack, control modules (EasyT, power contactor, auxiliary relay), and connections for a 24V DC backup power supply. This setup allows the robust and durable BMS Easy system without software to provide basic (backup, emergency) functions alongside an advanced digital superstructure.
GWL Group a.s.
Průmyslová 11, 102 00 Prague 10
Czech Republic, European Union
Visit us at www.gwl.eu
GWL Group a.s.
GWL Group a.s.