I've read all geocode service api documentation but haven't found anything about batch geocoding. May be I miss something and there is possibility to make a batch requests?
No. There is no way you can batch geocode a bunch of addresses but you can use the directions api to geocode up to 8 addresses. In the business class it allows up to 24 addresses. Read about it: https://developers.google.com/maps/documentation/javascript/directions. You can also try http://code.google.com/p/google-maps-tsp-solver/.
Yes you can. There are different limits for a free account vs an enterprise account. There is also a limit on how fast you can send requests per second.
来源：https://stackoverflow.com/questions/13858376/does-google-geocoding-api-v3-supports-batch-geocoding