Blog - Tests and diagnosis

GWL/Team Making Safety Tests

In April 2019, GWL Team has made extensive tests of various lithium cells to demonstrate the results of abuse and damage for these cells.

One part of the test was adirect short circuit dischargeof a fully charged TSWB Winston 40AH cell.

The photos show the preparation of the test.

Details of the Emergency Output for CPM1

Pin # 1 - Main Turn-on Impulse- 150 ms pulse to GND

The pin will be connected to GND for 150 ms when the board is powered on, or after the board has been reset (and restarted).

This pin is designed to give an impulse to the bistable relay or to give a power-on impulse to the auxiliary controls

Dogma: The energy of the regular “AA” cells = 1.43Wh

The AA cells are the primary one-time use cells. The nominal voltage ofthe AA cells is 1.5Vand their capacity in Ah usually not stated in the specification.It shows that people are fooled easily. ????

Image: you buy the milk in some box every day, but you never now how much liter

A battery pack keeps discharging “by it-self”

Email:Unfortunately, I do not have good news. We faced again a strange situation. The system was not used in the past 2 weeks, there was no grid shortage, the system was not used, and the BMS show that the battery pack was full, please see below the inverter log.

It is obvious from the voltage that&nb

We are moving electrons. A lot of them!

When cells are charged and discharged, the volume of the mass inside the cell is changing. This is because the electrons have a mass and this mass is added or removed when charged or discharged.

How many electrons are moved when working with the current of 1 Amp?

The electron flow produces current. T

BMS123 or GWL CPM? - Deeply discharged cells

As our customers are well aware, some type of protection module is necessary to use with every lithium battery for prevention of a deep discharge or overcharge.

I will use the example of our customer from Holland to describe how a significantly cheaper GWL CPM protection can often be the better choice th

GWL-CHL110AH - IFPE110 - Lithium Cell LiFePO4 (3.2V/110Ah)

The discharge diagrams for theat 36A, 55A and 100A currents.

GWL 40AH LTO Capacity Tests

The charge and discharge diagram for the LTO 40AH cells.

Customer requested to prove the real capacity before the shipment. We are happy to demonstrate that the cells meet the specifications as declared.

Overcharge of the TSWB cell

The diagram shows the overcharge of the TSWB cell and the temperature increase.

The cell is overcharged (after already being fully charged) gradually to 5V, 6V and 8V per cell. The temperature is monitored. The temperature reaches some 130*C.

The total time of the test is 30 minutes. During the test

Puncture test calb

CALB SE Series Puncture Test (video)

Result is simple: 100% save - no fire, no explosion, no overheating, no burning of the plastic case. Only the smoke from inside the cell caused by the internal short-circuit. ()