Li-ion charger with protection: understanding pin connections for battery and load

TECHNICAL SUPPORT Batteries & Power
1

Customer:

I have technical questions about this charger: (1) Do I connect the load to OUT (+) and OUT (-)? There’s also an OUT connector with just dots instead of + and - symbols, which confuses me. (2) What does the BAT label mean? Can I connect the battery directly to the BAT pads instead of using the JST connector? I want to remove the JST connector and solder wires directly to either the JST connector or the BAT pads. Does polarity matter on the BAT pads the same way it does on the JST connector, or does it not matter? And which option (JST connector or BAT pads) is better? (3) What does the IN label mean? I assume it’s not relevant for what I need.

Original message (Croatian)

[name removed]
RIJEKA - HR EU
[name removed] d.o.o. OSIJEK - HR EU [email removed]

Poštovani, ako mogu dobiti odgovore na ove tehničke upite: ( PITANJE 1. ) Dali se na priloženom punjaču spajam na OUT (+) i OUT (-) za ono što trebam napajati, a zbunjuje me OUT koji nema + i - nego samo sitne točke.
( PITANJE 2. ) Ako mogu dobiti objašnjenje što znači oznaka BAT = BATERIJA !? Dali bateriju mogu spojiti na tim mjestima BAT da ne moram ići preko JST KONEKTORA, a koji ću svakako maknuti jer mi smeta i žice ću direktno lemiti na JST KONEKTOR ili BAT !?
Dali je bitno gdje spajam ( crvenu i crnu ) žicu kao na JST KONEKTORU tvornički ili je nebitno mislim na BAT, a dok ću na JST KONEKTOR spojiti kako ide tvornički crna i crvena ako ne može opcija na BAT što mi ide u korist BAT opcija !?
( PITANJE 3. ) Što znači oznaka IN, a što mi je vjerojatno nebitno za ono što meni treba !?

Attachment omitted in migration: IMG_20230521_215734_169~2.jpg

Originally submitted via email support on 22 May 2023. Migrated to the forum for community visibility.

2

Soldered Support:

The pinout for the charger can be found at Li-ion-charger-with-protection-hardware-design/OUTPUTS/V1.1.1/Li-ion charger with protection Pinout.jpg at main · SolderedElectronics/Li-ion-charger-with-protection-hardware-design · GitHub. The schematic and CAD files are also available in the same GitHub repository. For connecting the load, use the OUT+ and OUT- pins.

The charger has multiple connection options. The USB connector is for input voltage to charge the battery. If you don’t want to use USB-C, we’ve provided 2 pins for connecting external 5V power (IN+ and IN- pins). For battery connection there are also 2 options: first is to connect the battery to the JST connector, which is simpler and faster; second is to solder wires to the BAT+ and BAT- pins. It’s important that you connect only the battery to these pins because this is how the protection circuit on the charger works correctly. So you can connect the battery to these pins as you described. The OUT pins are the output and are connected after the protection circuit on the board. Polarity matters on the BAT pads the same way as on the JST connector (red wire to BAT+, black wire to BAT-). If you have further questions about connections, feel free to ask.

Original message (Croatian)

  1. Pinout za punjač možete pronaći na Li-ion-charger-with-protection-hardware-design/OUTPUTS/V1.1.1/Li-ion charger with protection Pinout.jpg at main · SolderedElectronics/Li-ion-charger-with-protection-hardware-design · GitHub
    Također na istom GitHub repozitoriju se nalazi i shema te CAD datoteke za navedeni proizvod. Kod spajanja za trošilo koristiti OUT+ i OUT- pinove.

  2. Punjač ima više mogućnosti spajanja. USB konektor je za ulazni napon s kojim punite bateriju. Ako ne želite koristiti USB-C ostavili smo 2 pina za spojiti vanjsko napajanje od 5V (IN+ i IN- pinovi). Za spajanje baterije isto postoji 2 opcije. Prva je da bateriju spojite na JST konektor što je jednostavnije i brže, a druga je da zalemite žice na pinove BAT + i BAT - te tako spojite bateriju. Važno je da na te pinove spajate samo bateriju jer samo tako će zaštita s punjača raditi ispravno. Dakle možete spojiti bateriju na te pinove kako ste i napisali. OUT pinovi su izlaz te su oni spojeni nakon zaštite na pločici. Nadam se da sam barem malo pojasnio što je koji pin te da će spajanje biti lakše.

  3. Objašnjeno u prethodnom odgovoru.

Ako je još nešto nejasno oko spajanja slobodno pitajte.