SVG is an XML, you can use this python script to generate slices. Actually, it does not slice it, but uses same copy of input file with different values of viewBox to show only target area.

svg_slice.py

#!/usr/bin/env python

"""
    Generate slices

        python svg_slice.py 2 1 askUbuntu.svg

    ie: 2x1 grid

    Then use Inkscape to export PDF for each slice/cell

        for i in $(ls cell_*); do inkscape $i --export-pdf=$i.pdf; done;
"""


import sys, os.path
import xml.etree.ElementTree as ET

fin=sys.argv[-1]
hsplit=int(sys.argv[1])
vsplit=int(sys.argv[2])

tree = ET.parse(fin)
root = tree.getroot()

hstep=float(root.attrib['width'])/hsplit
vstep=float(root.attrib['height'])/vsplit

root.attrib['width']=str(hstep)
root.attrib['height']=str(vstep)

for i in range(hsplit):
    for j in range(vsplit):
        root.attrib['viewBox']='%.4f %.4f %.4f %.4f' % (i*hstep, j*vstep, hstep, vstep)
        tree.write('cell_%i-%i_%s' % (i,j,os.path.basename(fin)))