Tab inspection method and apparatus

1. A tab inspection method, wherein a tab protrudes from an end face of an electrode plate along a first direction, and the method comprises:

determining a first start position of the tab in a second direction of the electrode plate according to a first trigger manner, wherein the second direction is perpendicular to the first direction;

determining a second start position of the tab in the second direction of the electrode plate according to a second trigger manner; and

determining, according to a distance between the second start position and the first start position, whether a position of the tab on the electrode plate deviates;

wherein the first trigger manner is a manner for determining the position of the tab based on a change of a height of the electrode plate in the first direction, and the second trigger manner is a manner for determining the position of the tab based on a preset position of the tab on the electrode plate, and

wherein the method is performed by a tab inspection apparatus, the apparatus is connected to a sensor, the sensor comprises an emitting end and a receiving end, the emitting end and the receiving end are disposed opposite to each other on two sides of the electrode plate, so that the electrode plate moves in the second direction between the emitting end and the receiving end, the emitting end is configured to emit light, and the receiving end is configured to collect optical signals when the electrode plate moves to multiple different positions, to obtain multiple pieces of inspection data of the electrode plate at the different positions.

2. The method according to claim 1 , wherein the determining a first start position of the tab in a second direction of the electrode plate according to a first trigger manner comprises:

obtaining multiple pieces of inspection data of the electrode plate at multiple positions of the second direction, wherein the inspection data is inspection data corresponding to the height of the electrode plate in the first direction; and

determining, as the first start position of the tab, a position corresponding to inspection data that increases by a change exceeding a first threshold among the multiple pieces of inspection data.

3. The method according to claim 2 , wherein the first threshold is between 3 mm and 5 mm.

4. The method according to claim 2 , wherein the method further comprises:

determining M1 pieces of inspection data of the tab according to the multiple pieces of inspection data, wherein the M1 pieces of inspection data are inspection data of the tab at M1 consecutive positions of the second direction, the M1 pieces of inspection data are inspection data of a height of the tab in the first direction, and M1 is a positive integer greater than 1; and

determining, according to the M1 pieces of inspection data, whether a shape of the tab is normal.

5. The method according to claim 4 , wherein the determining M1 pieces of inspection data of the tab according to the multiple pieces of inspection data comprises:

determining, as initial inspection data, inspection data that increases by a change exceeding the first threshold among the multiple pieces of inspection data; and

determining, as the M1 pieces of inspection data of the tab, M1 pieces of consecutive inspection data starting from the initial inspection data.

6. The method according to claim 4 , wherein the determining, according to the M1 pieces of inspection data, whether a shape of the tab is normal comprises:

selecting N1 pieces of inspection data from the M1 pieces of inspection data, wherein N1<M1; and

determining, according to a relationship between the N1 pieces of inspection data and a second threshold, whether the tab is folded, wherein the second threshold is determined based on a preset height of the tab in the first direction.

7. The method according to claim 4 , wherein the determining, according to the M1 pieces of inspection data, whether a shape of the tab is normal comprises:

respectively selecting N2 pieces of inspection data and N3 pieces of inspection data from the M1 pieces of inspection data, wherein N2 and N3 are positive integers greater than 1, N2<M1, and N3<M1; and

determining, according to a relationship between the N2 pieces of inspection data and a third threshold and a relationship between the N3 pieces of inspection data and a fourth threshold, whether the tab is damaged, wherein the third threshold and the fourth threshold are determined based on the preset height of the tab in the first direction.

8. The method according to claim 7 , wherein the N2 pieces of inspection data are N2 pieces of inspection data in the middle of the M1 pieces of inspection data, and the N3 pieces of inspection data are N3 pieces of inspection data at two ends of the M1 pieces of inspection data.

9. The method according to claim 4 , wherein the method further comprises:

determining the position of the tab on the electrode plate according to the second trigger manner; and

determining, as the M2 pieces of inspection data of the tab, M2 pieces of inspection data corresponding to the position among the multiple pieces of inspection data, wherein the M2 pieces of inspection data comprise inspection data corresponding to the first start position, or the M1 pieces of inspection data comprise inspection data corresponding to the second start position.

10. The method according to claim 2 , wherein the method further comprises:

determining P pieces of inspection data of a non-tab region on the end face of the electrode plate according to the multiple pieces of inspection data, wherein the P pieces of inspection data are inspection data of the non-tab region at P different consecutive positions of the second direction, the P pieces of inspection data are inspection data corresponding to a height of the non-tab region in the first direction, and P is a positive integer greater than 1; and

determining, according to the P pieces of inspection data, whether a shape of the end face of the electrode plate is normal.

11. The method according to claim 10 , wherein the determining, according to the P pieces of inspection data, whether a shape of the end face of the electrode plate is normal comprises:

if differences between more than Q1 pieces of consecutive inspection data among the P pieces of inspection data and inspection data adjacent to the more than Q1 pieces of consecutive inspection data fall within a fifth threshold range, determining that the end face of the electrode plate is damaged, wherein Q1 is a preset value.

12. The method according to claim 10 , wherein the determining, according to the P pieces of inspection data, whether a shape of the end face of the electrode plate is normal comprises:

if absolute values of the Q2 pieces of inspection data among the P pieces of inspection data are greater than a sixth threshold, determining that a movement direction of the electrode plate deviates from the second direction in an inspection process.

13. The method according to claim 1 , wherein the determining a second start position of the tab in the second direction of the electrode plate according to a second trigger manner comprises:

determining the second start position according to a preset distance between the electrode plate and a preset position.

14. The method according to claim 1 , wherein the determining, according to a distance between the second start position and the first start position, whether a position of the tab on the electrode plate deviates comprises:

if the distance between the second start position and the first start position is equal to 0, determining that the tab does not deviate; and/or

if the distance between the second start position and the first start position is greater than 0, determining that the tab deviates.

15. The method according to claim 14 , wherein if it is determined that the tab deviates, the method further comprises:

if the distance between the second start position and the first start position is less than a seventh threshold, determining that the position of the tab on the electrode plate needs to be adjusted; and/or

if the distance between the second start position and the first start position is greater than a seventh threshold, determining that a section of the tab on the electrode plate needs to be removed.

16. The method according to claim 1 , wherein multiple tabs disposed in the second direction on the end face of the electrode plate have different heights.

17. The method according to claim 1 , wherein the sensor is configured to inspect the tab in a process of die-cutting the electrode plate to form the tab; or the sensor is configured to inspect the tab in a process of winding the electrode plate to form an electrode component.

18. A tab inspection apparatus, configured to perform the method according to claim 1 .

19. A tab inspection apparatus, comprising a processor and a memory, wherein the memory is configured to store a computer program, and the processor is configured to invoke the computer program to execute the tab inspection method according to claim 1 .