That depends entirely on the layout of the pack and how you set up the connections.
The thinner the strip is, the wider it has to be for the same cross section area, which is the real determining factor of “will X strip be enough for Y current?”
For example, people doing mountainboards often use a brick configuration (cells vertical) because height isn’t an issue because the battery is usually top-mounted in a box. For a brick config, you can use REALLY wide nickel, basically the width off the whole pack, like so:
This gives a HUGE cross section of nickel, because the current is not running along the length of the strip, but across it.
For a more conventional (flat) pack layout, you either need much thicker nickel, or more layers, (both ways are less-than-ideal), or just use something much more conductive than nickel for the thinner series connections, e.g. silicone wire. Check out ZackTetra’s awesome vendor thread for a great photo gallery of super clean and nicely laid out packs for some ideas.