Here's the [document|40686|service manual] for the camera.
In the parts list on p.29 (p.31 of 38 pdf) Item #39 it shows the part number for a silver battery cover - 10229103 and also a grey battery cover -10250668. Depends on whether the camera is silver or grey as I can't quite distinguish the colour from the image you posted.
Unfortunately searching online for either part number produced no results.
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Depending on the cost (plus shipping), you may wish to consider purchasing a [https://www.ebay.com.au/itm/186362064332?_skw=Casio+Exilim+EX-Z700+7.2+MP+Digital+Camera+Silver+Used+Untested+Good+Condition&itmmeta=01JG6VPFS3YG05QY3MNY5EXPMF&hash=item2b640b6dcc:g:N7gAAOSwaK1mANiW&itmprp=enc%3AAQAJAAABMHoV3kP08IDx%2BKZ9MfhVJKm0QVqPybqDZHHFtzp6LFn1qmdxc87Zya2gFN6Tr%2FIRAw8eE4H%2FfbOwn2wDojTGN0YPQWCUayNaKmhZISKJ1VTncoVwcWqfhP3934DCi4U8X6aqwk8xsk4M42sie6gL%2BLh%2FV6YNCbb78RRQgZpuz%2BzXtCrFegS6YG9a2rgFKPZqbXjooJJ8SGP3ds7q8lD5kN8PU8Z9u8MRlOWQgrYNp9I5rieRFRhsWEVFfOitsQCLWW03dSA3weG0qe81xkzlpTNqRFDo1Os15etFnaOufgRz8x6XZl0PsPBboH0XuJ4V%2Fku%2Biuf3WhTPNiPo8g96A87QQhjcYxOr%2FZWuIBjnacWepeRESM3jgiXbXM%2BFDyIUoL6u96KlddJoGEQofn7PcTI%3D%7Ctkp%3ABk9SR9L82duBZQ|used camera] and use it as a donor to restore your camera.
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There's also this [https://www.ebay.com.au/itm/395734700456?_skw=casio+ex+z700&itmmeta=01JG6VZ2S5W490AVRS0Z0HDQAJ&hash=item5c23a051a8:g:NFwAAOSwcnlmdU6A&itmprp=enc%3AAQAJAAAA0HoV3kP08IDx%2BKZ9MfhVJKl4Aa4uuCKX4hP0NcTZfIL5BfDhWZFTxnzbs%2BEVUDu9IiHvccWmXXUXlrlVwXXUlmai29ypCuG6epThky6lQXnwg%2FI0CPYMdrj79wjVhcS29GLIVy7g%2F%2BfA%2BYIfMMDcDzmxdR76IHWVwQ8h3rkpYgjzDOsKIwCJXOu6aaXi4%2BoJJB%2B63KD%2B7Z7FGzHgS0djve9qca2obWlSXYkJor4ul1HxB%2BpEqJbB7D0sOb75xRyRTOKY2o78P1E6a%2FLCCYrjKj8%3D%7Ctkp%3ABk9SR-Ks_NuBZQ|non working camera] if you don't mind the battery cover being red.
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Depending on the cost (plus shipping), you may wish to consider purchasing a [link|https://www.ebay.com.au/itm/186362064332?_skw=Casio+Exilim+EX-Z700+7.2+MP+Digital+Camera+Silver+Used+Untested+Good+Condition&itmmeta=01JG6VPFS3YG05QY3MNY5EXPMF&hash=item2b640b6dcc:g:N7gAAOSwaK1mANiW&itmprp=enc%3AAQAJAAABMHoV3kP08IDx%2BKZ9MfhVJKm0QVqPybqDZHHFtzp6LFn1qmdxc87Zya2gFN6Tr%2FIRAw8eE4H%2FfbOwn2wDojTGN0YPQWCUayNaKmhZISKJ1VTncoVwcWqfhP3934DCi4U8X6aqwk8xsk4M42sie6gL%2BLh%2FV6YNCbb78RRQgZpuz%2BzXtCrFegS6YG9a2rgFKPZqbXjooJJ8SGP3ds7q8lD5kN8PU8Z9u8MRlOWQgrYNp9I5rieRFRhsWEVFfOitsQCLWW03dSA3weG0qe81xkzlpTNqRFDo1Os15etFnaOufgRz8x6XZl0PsPBboH0XuJ4V%2Fku%2Biuf3WhTPNiPo8g96A87QQhjcYxOr%2FZWuIBjnacWepeRESM3jgiXbXM%2BFDyIUoL6u96KlddJoGEQofn7PcTI%3D%7Ctkp%3ABk9SR9L82duBZQ|used camera] and use it as a donor to restore your camera.
The service manual linked above shows how to safely disassemble the camera so that you can remove the battery cover from the donor camera and install it into your camera.
Hi @dongwook
You may be out of luck.
Here's the [document|40686|service manual] for the camera.
In the parts list on p.29 (p.31 of 38 pdf) Item #39 it shows the part number for a silver battery cover - 10229103 and also a grey battery cover -10250668. Depends on whether the camera is silver or grey as I can't quite distinguish the colour from the image you posted.
Unfortunately searching online for either part number produced no results.
Depending on the cost (plus shipping), you may wish to consider purchasing a [https://www.ebay.com.au/itm/186362064332?_skw=Casio+Exilim+EX-Z700+7.2+MP+Digital+Camera+Silver+Used+Untested+Good+Condition&itmmeta=01JG6VPFS3YG05QY3MNY5EXPMF&hash=item2b640b6dcc:g:N7gAAOSwaK1mANiW&itmprp=enc%3AAQAJAAABMHoV3kP08IDx%2BKZ9MfhVJKm0QVqPybqDZHHFtzp6LFn1qmdxc87Zya2gFN6Tr%2FIRAw8eE4H%2FfbOwn2wDojTGN0YPQWCUayNaKmhZISKJ1VTncoVwcWqfhP3934DCi4U8X6aqwk8xsk4M42sie6gL%2BLh%2FV6YNCbb78RRQgZpuz%2BzXtCrFegS6YG9a2rgFKPZqbXjooJJ8SGP3ds7q8lD5kN8PU8Z9u8MRlOWQgrYNp9I5rieRFRhsWEVFfOitsQCLWW03dSA3weG0qe81xkzlpTNqRFDo1Os15etFnaOufgRz8x6XZl0PsPBboH0XuJ4V%2Fku%2Biuf3WhTPNiPo8g96A87QQhjcYxOr%2FZWuIBjnacWepeRESM3jgiXbXM%2BFDyIUoL6u96KlddJoGEQofn7PcTI%3D%7Ctkp%3ABk9SR9L82duBZQ|used camera] and use it as a donor to restore your camera.
There's also this [https://www.ebay.com.au/itm/395734700456?_skw=casio+ex+z700&itmmeta=01JG6VZ2S5W490AVRS0Z0HDQAJ&hash=item5c23a051a8:g:NFwAAOSwcnlmdU6A&itmprp=enc%3AAQAJAAAA0HoV3kP08IDx%2BKZ9MfhVJKl4Aa4uuCKX4hP0NcTZfIL5BfDhWZFTxnzbs%2BEVUDu9IiHvccWmXXUXlrlVwXXUlmai29ypCuG6epThky6lQXnwg%2FI0CPYMdrj79wjVhcS29GLIVy7g%2F%2BfA%2BYIfMMDcDzmxdR76IHWVwQ8h3rkpYgjzDOsKIwCJXOu6aaXi4%2BoJJB%2B63KD%2B7Z7FGzHgS0djve9qca2obWlSXYkJor4ul1HxB%2BpEqJbB7D0sOb75xRyRTOKY2o78P1E6a%2FLCCYrjKj8%3D%7Ctkp%3ABk9SR-Ks_NuBZQ|non working camera] if you don't mind the battery cover being red.
The service manual linked above shows how to safely disassemble the camera so that you can remove the battery cover from the donor camera and install it into your camera.