SURFACE DENSITY DEVICE CALIBRATION APPARATUS AND SURFACE DENSITY DEVICE CALIBRATION METHOD

1 . An apparatus for calibrating a surface density measurement device, comprising:

a mounting bracket configured for mounting the surface density measurement device;

a standard member comprising multiple standard zones with different densities; and

an adjusting member connecting the standard member and the mounting bracket, wherein the adjusting member is configured to adjust positions of the multiple standard zones, such that the multiple standard zones move one by one to a testing position of the surface density measurement device.

2 . The apparatus according to claim 1 , wherein the standard member is rotatably disposed on the mounting bracket, the multiple standard zones are provided around a rotation center of the standard member, and the adjusting member is configured to drive the standard member to rotate relative to the mounting bracket, so as to adjust the positions of the multiple standard zones.

3 . The apparatus according to claim 1 , wherein the multiple standard zones are integrally formed.

4 . The apparatus according to claim 1 , wherein the mounting bracket further comprises a mounting disc, the multiple standard zones are provided around an outer side of the mounting disc, and the mounting disc is connected to the adjusting member.

5 . The apparatus according to claim 4 , wherein the standard zone and the mounting disc are integrally formed.

6 . The apparatus according to claim 4 , wherein the multiple standard zones are continuously provided along a circumferential direction of the mounting disc.

7 . The apparatus according to claim 2 , wherein one of the multiple standard zones is provided with a hollow portion.

8 . The apparatus according to claim 2 , wherein

the standard member further comprises a mounting disc, the mounting disc being connected to the mounting bracket, and the mounting disc being provided with multiple through holes spaced apart along a circumferential direction of the mounting disc;

the standard zones are mounted on the mounting disc, one standard zone covering one through hole; and

the mounting disc is connected to the adjusting member.

9 . The apparatus according to claim 8 , wherein the mounting disc is provided with a locking mechanism, the locking mechanism being configured to lock the standard zone to the mounting disc.

10 . The apparatus according to claim 9 , wherein the locking mechanism comprises a pressure ring and a connecting member, the pressure ring, the standard zone, and the mounting disc are stacked, the standard zone is located between the pressure ring and the mounting disc, and the connecting member connects the pressure ring and the mounting disc.

11 . The apparatus according to claim 8 , wherein the mounting disc is provided with a hollow portion, the hollow portion being staggered from the standard zone along the circumferential direction of the mounting disc.

12 . The apparatus according to claim 8 , wherein the standard zone comprises a coating layer and an electrode plate, a closed cavity is provided inside the coating layer, and the electrode plate is located in the closed cavity.

13 . The apparatus according to claim 1 , wherein thicknesses of the multiple standard zones gradually increase in a circumferential direction of the standard member.

14 . The apparatus according to claim 1 , wherein the standard member is movably disposed on the mounting bracket in a first direction, the multiple standard zones are arranged along the first direction, and the adjusting member is configured to drive the standard member to move along the first direction, so as to adjust the positions of the multiple standard zones relative to the mounting bracket.

15 . The apparatus according to claim 14 , wherein the multiple standard zones are integrally formed.

16 . The apparatus according to claim 15 , wherein the multiple standard zones are continuously provided along the first direction.

17 . The apparatus according to claim 14 , wherein thicknesses of the multiple standard zones gradually increase in the first direction.

18 . The apparatus according to claim 1 , wherein the standard zone is made of steel.

19 . A method for calibrating a surface density measurement device, performed by an apparatus that comprises a mounting bracket, a standard member comprising multiple standard zones with different densities, and an adjusting member connecting the standard member and the mounting bracket, the method comprising:

mounting the surface density measurement device to the mounting bracket;

measuring surface density values of the multiple standard zones using the surface density device;

obtaining relative surface density values of electrode plates corresponding to the multiple standard zones at a current ambient temperature; and

performing a linear regression analysis according to the surface density values of the multiple standard zones and the relative surface density values of the multiple standard zones, to calibrate the surface density measurement device through the standard member.

20 . The method according to claim 19 , wherein before obtaining the relative surface density values of electrode plates corresponding to the multiple standard zones at a current ambient temperature, the method further comprises:

calibrating the surface density device through the electrode plate at a given ambient temperature;

measuring surface density values of the multiple standard zones through the calibrated surface density measurement device to obtain the relative surface density values of the electrode plates corresponding to the multiple standard zones at the current ambient temperature; and

changing the ambient temperature and repeating the foregoing steps.

21 . The method according to claim 20 , wherein calibrating the surface density measurement device through the electrode plate comprises:

manufacturing multiple electrode plates with different surface densities;

measuring surface density values of the electrode plates through the surface density device;

obtaining actual surface density values of the electrode plates; and

performing a linear regression analysis according to the actual surface density values of the multiple electrode plates and the surface density values of the multiple electrode plates, to calibrate the surface density measurement device through the electrode plates.

22 . The method according to claim 21 , wherein obtaining the actual surface density values of the multiple electrode plates comprises:

sampling the multiple electrode plates separately;

weighing samples through a weighing device; and

calculating actual surface density values of the electrode plates corresponding to the samples based on weights and areas of the samples.

23 . The method according to claim 22 , wherein multiple samples are taken from each electrode plate, and the actual surface density value of each electrode plate is an average of surface density values of the corresponding multiple samples.

24 . The method according to claim 23 , wherein 6-12 samples are taken from each electrode plate.