Electrode assembly and related battery, battery module

1. An electrode assembly, comprising:

a plurality of first type of electrode plates, at least one second type of electrode plate, and a diaphragm, which are arranged in an overlapping manner,

wherein the polarity of the plurality of first type of electrode plates is opposite to the polarity of the at least one second type of electrode plate, the diaphragm is configured to separate an adjacent first type of electrode plate from the at least one second type of electrode plate, and the plurality of first type of electrode plates comprises a first electrode plate and a second electrode plate,

wherein the first electrode plate comprises a first current collector, and the second electrode plate comprises a second current collector,

wherein the first current collector comprises a first conducting layer and a protective layer which are arranged in an overlapping manner along a direction vertical to a surface on which the plurality of first type of electrode plates and the at least one second type of electrode plate are overlapped, and the resistivity of the protective layer is greater than the resistivity of the first conducting layer, and the first current collector comprises two of the protective layers, respectively arranged at two sides of the first conducting layer, and

wherein the second current collector is composed of a second conducting layer.

2. The electrode assembly according to claim 1 , wherein the material of each of the two protective layers comprises at least one of the following: polymer matrix, conducting material, and inorganic filler.

3. The electrode assembly according to claim 2 , wherein the polymer matrix comprises at least one of the following: polyvinylidene fluoride polymer matrix and polyvinylidene chloride polymer matrix.

4. The electrode assembly according to claim 1 , wherein the material of the first conducting layer is the same as the material of the second conducting layer.

5. The electrode assembly according to claim 1 , wherein the materials of the first conducting layer and the second conducting layer are both metal.

6. The electrode assembly according to claim 1 , wherein the thickness of the first conducting layer is smaller than or equal to the thickness of the second conducting layer.

7. The electrode assembly according to claim 1 , wherein the difference between the thickness of the first current collector and the thickness of the second current collector is no greater than 5 μm.

8. The electrode assembly according to claim 1 , wherein an electrode plate at an outermost layer of the electrode assembly is the first electrode plate.

9. A battery, comprising:

a housing; and

an electrode assembly according to claim 1 , wherein the electrode assembly is arranged in the housing.

10. A battery module, comprising a plurality of batteries according to claim 9 .

11. A battery pack, comprising a plurality of battery modules according to claim 10 .

12. A device using the battery, comprising the battery according to claim 9 , wherein the battery is configured to provide electric energy for the device.

13. A manufacturing method of an electrode assembly, comprising:

providing a plurality of first type of electrode plates, at least one second type of electrode plate and a diaphragm, wherein the polarity of the plurality of first type of electrode plates is opposite to the polarity of the at least one second type of electrode plate, the diaphragm is configured to separate adjacent first type of electrode plate from the second type of electrode plate, the plurality of first type of electrode plates comprises a first electrode plate and a second electrode plate, the first electrode plate comprises a first current collector, the second electrode plate comprises a second current collector, wherein the first current collector comprises a first conducting layer and a protective layer which are arranged in an overlapping manner along a direction vertical to a surface on which the first type of electrode plate and the second type of electrode plate are overlapped, and the resistivity of the protective layer is greater than the resistivity of the first conducting layer, the first current collector comprises two of the protective layers, respectively arranged at two sides of the first conducting layer; the second current collector is composed of a second conducting layer; and

arranging the plurality of first type of electrode plates, at least one second type of electrode plate and the diaphragm in an overlapping manner.