5.3.1.2. ADI ADES1830-based 16-Cell Slave v0.9.0

Note

The changelog for this release is found at v0.9.0.

5.3.1.2.1. Overview

Important

The following description only applies for the ADI ADES1830-based 16 cell BMS-Slave hardware version 0.9.0.

Hint

All connector pinouts described below follow the Convention for Molex Micro-Fit 3.0 Connector Pin Numbering.

5.3.1.2.2. Specifications

5.3.1.2.2.1. Electrical Ratings

The current consumption from the module has been measured at 57.6 V module voltage, which is equivalent to a cell voltage of 3.6 V per cell. No sense lines have been connected for this measurement (as the impact of cell voltage sensing is negligible on the current consumption).

Table 5.51 Electrical Ratings

Description

Minimum

Typical

Maximum

Unit

Battery Module Voltage

11

80

V

Single Battery Cell Voltage

0

5

V

Temperature Sensor Inputs

10k

\({\Omega}\)

Current consumption: AFE active

TBD

mA

5.3.1.2.2.2. Mechanical Dimensions

Table 5.52 Mechanical Dimensions

Description

Value

Unit

Width

100

mm

Length

160

mm

Height

15

mm

Weight

(TBC) 88

g

5.3.1.2.2.3. Block Diagram

The block diagram of the BMS-Slave is shown in Fig. 5.7.

../../../_images/16-adi-ades1830-v0.9.0.png

Fig. 5.7 BMS-Slave 16-Cell Block Diagram

5.3.1.2.2.4. Schematic and Board Layout

More information about the board schematic and layout files can be found in section Design Resources.

5.3.1.2.3. Functions

5.3.1.2.3.1. Cell Voltage Measurement

The cell voltage sense lines are input on the connector J400. The pinout is described in Table 5.53.

../../../_images/molex_connector-24pin.png
Table 5.53 Cell voltage sense connector

Pin

Signal

Direction

Description

1

VBAT-

Input

Battery module negative terminal

2

CELL_0+

Input

Cell 0 positive terminal

3

CELL_2+

Input

Cell 2 positive terminal

4

CELL_4+

Input

Cell 4 positive terminal

5

CELL_6+

Input

Cell 6 positive terminal

6

CELL_8+

Input

Cell 8 positive terminal

7

CELL_10+

Input

Cell 10 positive terminal

8

CELL_12+

Input

Cell 12 positive terminal

9

CELL_14+

Input

Cell 14 positive terminal

10

VBAT+

Input

Battery module positive terminal

11

not connected

-

-

12

not connected

-

-

13

CELL_0-

Input

Cell 0 negative terminal

14

CELL_1+

Input

Cell 1 positive terminal

15

CELL_3+

Input

Cell 3 positive terminal

16

CELL_5+

Input

Cell 5 positive terminal

17

CELL_7+

Input

Cell 7 positive terminal

18

CELL_9+

Input

Cell 9 positive terminal

19

CELL_11+

Input

Cell 11 positive terminal

20

CELL_13+

Input

Cell 13 positive terminal

21

CELL_15+

Input

Cell 15 positive terminal

22

not connected

-

-

23

not connected

-

-

24

not connected

-

-

The VBAT+ and VBAT- connection is used for the internal power supply of the slave board.

The cell input lines are filtered by differential capacitor filter: both possibilities are provided on the PCB of the BMS-Slave. More information on the corner frequency of this filtering can be found in the schematic. The differential capacitor filter can be used when noise is less frequent or the design is subjected to cost optimization.

5.3.1.2.3.2. Passive Cell Balancing

The passive balancing circuit is realized by a series connection of two 30 \({\Omega}\) discharge-resistors that can be connected to each single cell in parallel. The balancing process is controlled by the ADI ADES1830 monitoring IC. The resistor value of 2x 30 \({\Omega}\) results in a balancing current of about 60 mA at a cell voltage of 3.6 V. This current results in a power dissipation of about 0.2W per balancing channel (at 3.6 V).

5.3.1.2.3.3. Temperature Sensor Measurement

The cell temperature sensors are connected to the connectors J403.

The pinout is described in Table 5.54.

../../../_images/molex_connector-20pin.png
Table 5.54 Temperature sensor connector

Pin

Signal

Direction

Description

1

T-SENSOR_0

Input

NTC Sensor 0 terminal 1

2

T-SENSOR_1

Input

NTC Sensor 1 terminal 1

3

T-SENSOR_2

Input

NTC Sensor 2 terminal 1

4

T-SENSOR_3

Input

NTC Sensor 3 terminal 1

5

T-SENSOR_4

Input

NTC Sensor 4 terminal 1

6

T-SENSOR_5

Input

NTC Sensor 5 terminal 1

7

T-SENSOR_6

Input

NTC Sensor 6 terminal 1

8

T-SENSOR_7

Input

NTC Sensor 7 terminal 1

9

T-SENSOR_8

Input

NTC Sensor 8 terminal 1

10

T-SENSOR_9

Input

NTC Sensor 9 terminal 1

11

VBAT-

Input

NTC Sensor 0 terminal 2

12

VBAT-

Input

NTC Sensor 1 terminal 2

13

VBAT-

Input

NTC Sensor 2 terminal 2

14

VBAT-

Input

NTC Sensor 3 terminal 2

15

VBAT-

Input

NTC Sensor 4 terminal 2

16

VBAT-

Input

NTC Sensor 5 terminal 2

17

VBAT-

Input

NTC Sensor 6 terminal 2

18

VBAT-

Input

NTC Sensor 7 terminal 2

19

VBAT-

Input

NTC Sensor 8 terminal 2

20

VBAT-

Input

NTC Sensor 9 terminal 2

Standard 10 \({k\Omega}\) NTC resistors are recommended for use. When using other values than these, the series resistors (R517-R526) on the board may have to be adjusted. Please note that the accuracy of the internal voltage reference VREF2 decreases heavily with a load of over 3 mA. Using 10x 10 \({k\Omega}\) NTC resistors with the corresponding 10 \({k\Omega}\) series resistors results in a current of 1.5mA (at 20 °C) which is drawn from VREF2.

Each 10 temperature sensors are connected to an GPIO pin of the ADI ADES1830.

5.3.1.2.3.4. isoSPI Daisy Chain Connection

The data transmission between the slaves and between the slaves and BMS master uses the isoSPI interface. The isoSPI signals are input/output on the connectors J501/J402. The isoSPI ports are bidirectional, that means they can be used in forward and reverse direction. The isoSPI connections are isolated galvanically using pulse transformers (T500/T501).

The pinout of the isoSPI connectors is described in Table 5.55 and Table 5.56.

../../../_images/molex_connector-2pin.png
Table 5.55 isoSPI Daisy Chain Input Connectors

Pin

Daisy Chain

1

IN+ ADI ADES1830

2

IN- ADI ADES1830

Table 5.56 isoSPI Daisy Chain Output Connectors

Pin

Daisy Chain

1

OUT+ ADI ADES1830

2

OUT- ADI ADES1830

5.3.1.2.4. Software Driver Implementation

The driver implementation for this AFE is documented at ADI ADES1830.