When a divorce or child custody battle is not involved, a false claim of domestic violence may be made when one party is vindictive toward the other and wants to exact revenge. Or maybe a heated argument occurs and is misconstrued as actual violence.
Perhaps only shouting was involved, and no physical abuse or violence happened. Or perhaps physical contact was limited to grabbing an arm or a hand, but without actual violence. A claim still could be made that violence occurred, and that claim would have to be disproved by the accused