Current collector, pole piece, battery cell and vehicle

Abstract

The utility model discloses a current collector, a pole piece, a battery cell and a vehicle. The current collector comprises a base material layer, a first conductive layer and a second conductive layer. Wherein the base material layer has a set thickness direction, and the base material layer is provided with a first side and a second side which are opposite in direction along the thickness direction; the first conductive layer is arranged on the surface of the first side of the substrate layer; the second conductive layer is arranged on the surface of the second side of the base material layer; wherein the base material layer is provided with a first through hole penetrating along the thickness direction, at least one of the first conductive layer and the second conductive layer is provided with a second through hole penetrating along the thickness direction, and at least part of the plurality of second through holes can be communicated with the first through hole to form a passage for electrolyte to flow, so that the wettability of the electrolyte to the current collector is improved, and the current collector is prevented from being damaged. The conduction performance of ions is enhanced, and the electrical performance of the current collector is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, and in particular to a current collector, a pole piece and a battery core. Background Art

[0002] In the related art, the current collector is an important component in new energy batteries, which has the function of collecting the current generated by active materials (positive electrode active materials such as lithium iron phosphate, lithium manganese iron phosphate, lithium cobalt oxide, etc., negative electrode active materials such as graphite, graphene, carbon nanotubes, etc.) to form a larger current output. The use of composite current collectors can further improve energy density, toughness and elongation. However, the existing composite current collectors are still insufficient in their ability to conduct ions and cannot meet the development needs of new energy batteries. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a current collector that can enhance the wettability of the current collector and enhance the ion conduction performance and improve the electrical performance of the current collector when the first conductive layer and the second conductive layer are used to carry active materials with different polarities.

[0004] The utility model also provides a pole piece having the current collector.

[0005] The utility model also provides a battery core having the pole piece.

[0006] The utility model also provides a vehicle with the battery core.

[0007] The current collector according to the first embodiment of the utility model includes:

[0008] A substrate layer having a set thickness direction, wherein the substrate layer has a first side and a second side facing opposite directions along the thickness direction;

[0009] A first conductive layer, disposed on a surface of the first side of the substrate layer;

[0010] A second conductive layer is disposed on the surface of the second side of the substrate layer;

[0011] Among them, the substrate layer is provided with a first through hole penetrating along the thickness direction, and at least one of the first conductive layer and the second conductive layer is provided with a second through hole penetrating along the thickness direction, and at least part of the plurality of second through holes can be connected with the first through hole to form a passage for the flow of electrolyte.

[0012] The current collector according to the embodiment of the utility model has at least the following beneficial effects: at least part of the multiple first through holes provided in the conductive layer can be combined with the second through holes provided in the substrate layer to form a passage for the flow of electrolyte, thereby improving the wettability of the electrolyte to the current collector and enhancing the conductivity of ions, thereby improving the electrical properties of the current collector.

[0013] According to some embodiments of the present invention, the porosity of the substrate layer is 40%-60%, and / or the pore size of the first through hole is 0.01 μm-0.3 μm.

[0014] According to some embodiments of the present invention, the diameter of the first through hole provided in the first conductive layer is 1 μm-30 μm, and / or the porosity of the first conductive layer is 10%-30%.

[0015] According to some embodiments of the present invention, the diameter of the second through hole provided in the second conductive layer is 1 μm-30 μm, and / or the porosity of the second conductive layer is 10%-30%.

[0016] According to some embodiments of the present invention, the thickness of the substrate layer is 1 μm-100 μm.

[0017] According to some embodiments of the present invention, the thickness of the first conductive layer is 0.5 μm-60 μm, and / or the thickness of the second conductive layer is 0.5 μm-60 μm.

[0018] According to some embodiments of the present invention, the first conductive layer and the second conductive layer are used to carry active materials with different polarities.

[0019] According to some embodiments of the present invention, the first conductive layer is used to carry the positive electrode active material, and the second conductive layer is used to carry the negative electrode active material:

[0020] Wherein, the thickness of the first conductive layer is 0.5 μm-30 μm;

[0021] And / or, the thickness of the second conductive layer is 0.5 μm-60 μm.

[0022] The pole piece according to the second aspect of the present invention includes:

[0023] The current collector provided by the embodiment of the first aspect above;

[0024] A first active material layer, coated on the first conductive layer;

[0025] The second active material layer is coated on the second conductive layer.

[0026] The pole piece according to the embodiment of the utility model has at least the following beneficial effects: the pole piece includes the current collector provided by the above-mentioned second aspect embodiment, and at least has all the effects of the current collector. When the ion conductivity and electrical performance of the current collector are improved, the electrical performance of the pole piece is also improved accordingly.

[0027] According to some embodiments of the present invention, the first active material layer and the second active material layer have opposite polarities.

[0028] The battery cell according to the third aspect of the present utility model is characterized by comprising the pole piece provided by the second aspect of the present utility model.

[0029] The battery cell according to the embodiment of the utility model has at least the following beneficial effects: the battery cell includes the pole piece provided by the embodiment of the second aspect mentioned above, and at least has all the advantages of the pole piece.

[0030] A vehicle according to a fourth embodiment of the utility model includes the battery cell provided by the third embodiment.

[0031] The vehicle according to the embodiment of the utility model has at least the following beneficial effects: the vehicle includes the battery cell provided by the embodiment of the third aspect mentioned above, and at least has all the advantages of the battery cell.

[0032] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0034] Figure 1 It is a cross-sectional view of the current collector of the embodiment of the utility model;

[0035] Figure 2 It is a cross-sectional view of a pole piece according to an embodiment of the utility model.

[0036] Reference numerals:

[0037] The current collector 100, the substrate layer 110, the first conductive layer 120, the second conductive layer 130, the first through hole 140, and the second through hole 150;

[0038] The first active material layer 200 and the second active material layer 300 . DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0043] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] As an important component in new energy batteries, the current collector has the function of collecting the current generated by the active material to form a larger current output. The use of composite current collectors can further improve energy density, toughness and elongation. However, the existing composite current collectors are still insufficient in conducting ions and cannot meet the development needs of new energy batteries.

[0045] Reference Figure 1The first embodiment of the utility model provides a current collector 100, including a substrate layer 110, a first conductive layer 120 and a second conductive layer 130. The substrate layer 110 has a set thickness direction, and the substrate layer 110 has a first side and a second side facing oppositely along the thickness direction, and the substrate layer 110 is made of an insulating material. The first conductive layer 120 is arranged on the surface of the first side of the substrate layer 110; the second conductive layer 130 is arranged on the surface of the second side of the substrate layer 110; the substrate layer 110 is provided with a first through hole 140 penetrating along the thickness direction, and at least one of the first conductive layer 120 and the second conductive layer 130 is provided with a plurality of second through holes 150 penetrating along the thickness direction, and the second through holes 150 arranged in the first conductive layer 120 and / or the second conductive layer 130 can be combined with the first through holes 140 arranged in the substrate layer 110 to form a passage for the flow of electrolyte.

[0046] The second through hole 150 provided in the conductive layer can be combined with the first through hole 140 provided in the substrate layer 110 to form a passage for the flow of electrolyte, and the substrate layer 110 is made of an insulating material, and the substrate layer 110 allows ions to pass freely while isolating electrons, thereby improving the wettability of the electrolyte to the current collector 100 and enhancing the ion conductivity, thereby improving the electrical performance of the current collector 100. In addition, the second through hole 150 provided in the first conductive layer 120 and / or the second conductive layer 130 does not need to be completely combined with the first through hole 140 provided in the substrate layer 110, and the aperture of the second through hole 150 provided in the first conductive layer 120 and / or the second conductive layer 130 does not need to be equal to the aperture of the first through hole 140 provided in the substrate layer 110, and only at least partial combination is required to achieve the circulation of the electrolyte.

[0047] At the same time, the second through holes 150 provided in the first conductive layer 120 and / or the second conductive layer 130 can also be used to store electrolyte. When a large amount of electrolyte is consumed in the later stage of the battery cell cycle, the second through holes 150 provided in the first conductive layer 120 and / or the second conductive layer 130 can still provide electrolyte to the corresponding active material layer, thereby ensuring the wetting of the active material layer, reducing the possibility of lithium deposition on the electrode in the later stage of the cycle, and improving the service life of the battery.

[0048] In addition, the first conductive layer 120 and / or the second conductive layer 130 is a porous structure with a set porosity. Compared with the conductive layer with a non-porous structure, the conductive layer with a porous structure can reduce the weight proportion of the current collector 100 in the electrode, thereby improving the energy density when the electrode is applied to the battery cell. Moreover, when the current collector is applied to the battery cell, although the multiple second through holes 150 increase the transport resistance of electrons on the first conductive layer 120 and / or the second conductive layer 130, the multiple second through holes 150 also increase the specific surface area of ​​the first conductive layer 120 and / or the second conductive layer 130, thereby improving the diffusion rate of molecules and the efficiency of electrochemical reactions, and the interface impedance will also be reduced accordingly. Therefore, the conductivity of the conductive layer provided with multiple second through holes 150 may still be greater than or equal to the conductivity of the conductive layer without a porous structure.

[0049] It is understandable that the second through hole 150 provided in the first conductive layer 120 and / or the second conductive layer 130 can be manufactured by a processing method in the prior art, such as by laser drilling.

[0050] In some embodiments, the substrate layer 110 is composed of one or more of PP (polypropylene), PE (polyethylene), PVDF (polyvinylidene fluoride), PAN (polyacrylonitrile), PMMA (polymethyl methacrylate), BC (bacterial cellulose), PET (polyethylene terephthalate), PI (polytetrafluoroethylene), PTFE (polytetrafluoroethylene), etc. The substrate layer 110 made of the above materials can achieve good insulation properties to ensure the safety of the current collector 100 during use.

[0051] In some embodiments, the porosity of the substrate layer 110 is 40%-60%, and / or the pore size of the first through hole 140 is 0.01μm-0.3μm. The porosity of the substrate layer 110 can be selected as 40%, 45%, 50%, 55%, 60% or any other value in the range of 40%-60%, and the pore size of the first through hole 140 can be selected as 0.01μm, 0.05μm, 0.1μm, 0.15μm, 0.20μm, 0.25μm, 0.30μm or any other value in the range of 0.01μm-0.3μm. Since the substrate layer 110 is made of an insulating material with a porosity of 40%-60%, when the substrate layer 110 is applied to the pole piece, the substrate layer 110 can be used as a diaphragm and has the function of allowing lithium ions or sodium ions to pass freely while isolating electrons, so the pore size of the first through hole 140 needs to be larger than the particle size of lithium ions or sodium ions.

[0052] The porosity of the substrate layer 110 determines the transport performance of the composite current collector 100. A higher porosity can provide a faster ion transport speed, which helps to improve the charge and discharge speed and performance of the current collector 100 when applied to a battery. However, the porosity of the substrate layer 110 cannot be too high. Too high a porosity may cause the mechanical properties of the substrate to decrease, and the voids in the substrate layer 110 may reduce the structural strength, toughness and ductility of the substrate. When the current collector 100 is subjected to external impact or internal stress, the substrate layer 110 with a larger porosity is more likely to deform, rupture or be damaged.

[0053] In addition, the porosity of the substrate layer 110 also affects the thermal conductivity of the composite current collector 100. The substrate layer 110 with a higher porosity usually has a lower thermal conductivity, which directly leads to slow heat transfer, which is not conducive to the heat dissipation and temperature control of the battery. Therefore, the substrate layer 110 needs to select a suitable porosity to balance the contradiction between ion mass transfer performance and thermal conductivity.

[0054] In some embodiments, the thickness of the substrate layer 110 is 1 μm-100 μm. The thickness of the substrate layer 110 can be selected to be 1 μm, 3 μm, 5 μm, 8 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm or any other value in the range of 1 μm-100 μm. The thickness of the substrate layer 110 directly affects the strength and durability of the current collector 100. A thicker substrate layer 110 can provide better mechanical support and compressive resistance, making the current collector 100 more stable and reliable when subjected to fluid pressure or external impact. However, a thicker substrate means more raw materials are used, which increases the manufacturing cost of the current collector 100 and the weight of the final product. At the same time, the increase in the thickness of the substrate layer 110 will also increase the distance of ion transmission, which will lead to a decrease in ion transport efficiency. Therefore, the thickness of the substrate layer 110 is selected to be 1μm-100μm. While ensuring the strength of the substrate layer 110, the weight proportion of the current collector 100 in the electrode is low and the ion transport efficiency can be guaranteed.

[0055] In some embodiments, the pore size of the second through hole 150 provided in the first conductive layer 120 is 1 μm-30 μm and / or the porosity of the first conductive layer 120 is 10%-30%. The pore size of the second through hole 150 provided in the first conductive layer 120 can be selected as 1 μm, 3 μm, 5 μm, 8 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm or any other value in the range of 0.5 μm-30 μm, and the porosity of the first conductive layer 120 can be selected as 10%, 15%, 20%, 25%, 30% or any other value in the range of 10%-30%. The porosity of the first conductive layer 120 should not be too high or too low. When the porosity of the first conductive layer 120 is too high, for example, greater than 30%, although the first conductive layer 120 has a good conduction effect on the electrolyte, it will cause the mechanical strength of the first conductive layer 120 to be reduced, and it is easy to be damaged and short-circuited when subjected to external impact or internal stress; and when the porosity of the first conductive layer 120 is too low, for example, less than 10%, it will cause the first conductive layer 120 to have insufficient conduction performance for the electrolyte, which will reduce the electrical performance of the current collector 100. Similarly, the selection of the aperture size of the second through hole 150 also needs to consider the impact on the conductive performance, mechanical strength and the penetration effect of the electrolyte.

[0056] In some embodiments, the pore size of the second through hole 150 provided in the second conductive layer 130 is 1 μm-30 μm and / or the porosity of the second conductive layer 130 is 10%-30%. The pore size of the pores of the second conductive layer 130 can be selected as 1 μm, 3 μm, 5 μm, 8 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm or any other value in the range of 0.5 μm-30 μm, and the porosity of the second conductive layer 130 can be selected as 10%, 15%, 20%, 25%, 30% or any other value in the range of 10%-30%. The selection principle of the pore size and porosity of the second through hole 150 provided in the second conductive layer 130 is the same as the selection principle of the pore size and porosity of the second through hole 150 provided in the first conductive layer 120, and will not be repeated here.

[0057] In some embodiments, the thickness of the first conductive layer 120 and / or the second conductive layer 130 is 0.5 μm-60 μm. The first conductive layer 120 and / or the second conductive layer 130 need to select a suitable thickness to balance the conductivity and weight. If the thickness of the first conductive layer 120 is large, the thicker first conductive layer 120 has a lower resistance and can provide higher conductivity, and is more difficult to be damaged or broken when subjected to force, and has better mechanical strength, but it will lead to a higher weight and cost of the current collector 100, and the flexibility of the first conductive layer 120 is correspondingly reduced. A too thin conductive layer is also easily affected by mechanical stress, such as vibration or impact, resulting in damage to the current collector 100 or a decrease in conductivity, and vice versa. The thickness of the first conductive layer 120 and / or the second conductive layer 130 may be selected to be 0.5 μm, 1 μm, 3 μm, 5 μm, 8 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm or any other value between 0.5 μm and 60 μm.

[0058] When the current collector 100 is applied to the pole piece, the conductive layer carries active material, and the active material particles can be embedded in the second through hole 150, thereby improving the bonding strength between the active material layer and the conductive layer. When mechanical abuse occurs, such as a steel needle puncture test, the possibility of the active material layer being separated from the conductive layer after being penetrated by the steel needle is reduced, thereby reducing the probability of a short circuit in the battery cell.

[0059] Reference Figure 2 , the first conductive layer 120 and the second conductive layer 130 can be used to carry active materials with the same or opposite polarities. When the first conductive layer 120 and the second conductive layer 130 are used to carry active materials with opposite polarities, the current collector 100 is a bipolar current collector. When the current collector 100 is applied to the pole piece, the substrate layer 110 can be used as a diaphragm, thereby reducing the use of diaphragms when making battery cells. When the first conductive layer 120 and / or the second conductive layer 130 are used to carry positive electrode active materials, the conductive layer can be made of at least one of Al, Ni, stainless steel, Fe, and Ti, or a combination of two of them. When the first conductive layer 120 and / or the second conductive layer 130 are used to carry negative electrode active materials, the conductive layer can be made of at least one of Cu, Ni, stainless steel, Fe, and Ti, or a combination of two of them.

[0060] In some embodiments, the first conductive layer 120 is used to carry the positive electrode active material, which is used to provide ions when participating in the reaction. The positive electrode active material can be selected from the positive electrode active materials commonly used in the prior art, such as one or more combinations of lithium iron phosphate, lithium iron manganese phosphate, lithium cobalt oxide, lithium iron manganese, nickel cobalt manganese lithium, etc. The second conductive layer 130 is used to carry the negative electrode active material, which is used to receive ions when participating in the reaction. The negative electrode active material can be selected from the negative electrode active materials commonly used in the prior art, such as one or more combinations of graphite, graphene, carbon nanotubes, etc. Among them, the thickness of the first conductive layer 120 is 0.5μm-30μm; and / or, the thickness of the second conductive layer 130 is 0.5μm-60μm. When the first conductive layer 110 carries positive electrode active material and the second conductive layer 120 carries negative electrode active material, the thickness of the first conductive layer 120 can be selected to be 0.5μm, 1μm, 3μm, 5μm, 8μm, 10μm, 15μm, 20μm, 25μm, 30μm or any other value in the range of 0.5μm-30μm; the thickness of the second conductive layer 130 can be selected to be 0.5μm, 1μm, 3μm, 5μm, 8μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm or any other value in the range of 0.5μm-60μm.

[0061] Since the particle size of the negative electrode active material particles is different from that of the positive electrode active material particles, generally speaking, the particles of the negative electrode active material are larger than the particles of the positive electrode active material, and thus the thickness selection range of the second conductive layer 130 is correspondingly increased compared to the first conductive layer 120, so as to ensure that the active material particles in the second active material layer 300 can be embedded in the second through holes 150 provided in the second conductive layer 130 with a sufficient depth, thereby ensuring the bonding strength between the second active material layer 300 and the second conductive layer 130, and improving the safety of the battery.

[0062] Reference Figure 2 The second embodiment of the utility model provides a pole piece, characterized in that it includes a first active material layer 200, a second active material layer 300 and the current collector 100 provided in the first embodiment. The first active material layer 200 is coated on the first conductive layer 120; the second active material layer 300 is coated on the second conductive layer 130. The pole piece includes the current collector 100 provided in the first embodiment, and at least has all the advantages of the current collector 100. When the ion conductivity and electrical performance of the current collector 100 are improved, the electrical performance of the pole piece is also improved accordingly.

[0063] The third aspect of the present invention provides a battery cell (not shown in the figure), including the pole piece provided by the second aspect of the present invention. Among them, the number of pole pieces is one, and the polarity of the first active material layer 200 is opposite to that of the second active material layer 300. When the battery cell includes only one pole piece, the substrate layer 110 in the current collector 100 can realize the function of a diaphragm. For example, when the polarity of the first active material layer 200 is positive, the polarity of the second active material layer 300 is negative, and the lithium ions generated on the second active material layer 300 are transferred to the first active material layer 200 through the substrate layer 110, while the electrons are transported on the conductive layer, that is, the first conductive layer 120 is connected to the positive output end of the battery cell, and the second conductive layer 130 is connected to the negative output end of the battery cell. The area of ​​the pole piece can be determined according to actual needs, so that applications requiring thinner batteries such as ultra-thin batteries and paper batteries can be realized.

[0064] The fourth embodiment of the utility model provides another battery cell (not shown in the figure), including a separator and the pole piece provided by the second embodiment. The battery cell provided in the present application can also be a wound structure battery cell or a laminated structure battery cell, in which case the polarity of the first active material layer 200 and the second active material layer 300 can be the same or different.

[0065] When the battery cell is a wound structure battery cell, the battery cell also includes a diaphragm, and the number of pole pieces is two. The diaphragm is arranged between the two pole pieces, and the two pole pieces and the diaphragm are wound to form a battery cell. When the polarity of the first active material layer 200 and the second active material layer 300 is the same, the two pole pieces are respectively a positive pole piece and a negative pole piece, and the electrolyte is transported through the diaphragm; when the polarity of the first active material layer 200 and the second active material layer 300 is different, the first active material layer 200 on one pole piece and the second active material layer 300 on the other pole piece are arranged oppositely, and at this time, the first active material layer 200 on the pole piece can react with the second active material layer 300 arranged on the pole piece itself through the conductive layer and the substrate layer 100, and can also react with the second active material layer 300 on the other pole piece.

[0066] Alternatively, when the battery cell is a laminated structure battery cell, the diaphragm is folded in a "Z" shape, the number of pole pieces is multiple, the multiple pole pieces are stacked, and the diaphragm is arranged between adjacent pole pieces. Similarly, when the polarity of the first active material layer 200 and the second active material layer 300 are the same, the polarity of the adjacent pole pieces is opposite along the thickness direction of the pole piece; and when the polarity of the first active material layer 200 and the second active material layer 300 are different, along the thickness direction of the pole piece, the first active material layer 200 and the second active material layer 300 of the adjacent pole pieces are arranged oppositely, and the first active material layer 200 on the pole piece can react with the second active material layer 300 arranged on the pole piece itself through the conductive layer and the substrate layer 100, and can also react with the second active material layer 300 on another pole piece.

[0067] The fifth aspect embodiment of the present application also provides a vehicle (not shown in the figure), the vehicle includes the battery cell provided by the third aspect and / or the fourth aspect embodiment, and at least includes all the advantages of the battery cell. The vehicle is a new energy vehicle, which can be a hybrid vehicle or a pure electric vehicle. Specifically, the vehicle can be a private car, such as a sedan, SUV, MPV or pickup truck. The vehicle can also be an operating vehicle, such as a van, a bus, a small truck or a large trailer.

[0068] The embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A current collector, characterized in that: include: A substrate layer having a set thickness direction, wherein the substrate layer has a first side and a second side facing opposite directions along the thickness direction; A first conductive layer, disposed on a surface of the first side of the substrate layer; A second conductive layer is disposed on the surface of the second side of the substrate layer; Among them, the substrate layer is provided with a plurality of first through holes penetrating along the thickness direction, and at least one of the first conductive layer and the second conductive layer is provided with a plurality of second through holes penetrating along the thickness direction, and at least part of the plurality of second through holes can be connected with the first through holes to form a passage for the flow of electrolyte.

2. The current collector according to claim 1, characterized in that: The porosity of the substrate layer is 40%-60%, and / or the pore size of the first through hole is 0.01 μm-0.3 μm.

3. The current collector according to claim 1, characterized in that: The aperture of the second through hole provided in the first conductive layer is 1 μm-30 μm, and / or the porosity of the first conductive layer is 10%-30%.

4. The current collector according to claim 1, characterized in that: The second through holes provided in the second conductive layer have a pore size of 1 μm-30 μm, and / or the porosity of the second conductive layer is 10%-30%.

5. The current collector according to claim 1, characterized in that: The thickness of the substrate layer is 1 μm-100 μm.

6. The current collector according to claim 1, characterized in that: The thickness of the first conductive layer is 0.5 μm-60 μm, and / or the thickness of the second conductive layer is 0.5 μm-60 μm.

7. The current collector according to claim 1, characterized in that: The first conductive layer and the second conductive layer are used to carry active materials with different polarities.

8. The current collector according to claim 7, characterized in that: The first conductive layer is used to carry the positive electrode active material, and the second conductive layer is used to carry the negative electrode active material: Wherein, the thickness of the first conductive layer is 0.5 μm-30 μm; And / or, the thickness of the second conductive layer is 0.5 μm-60 μm.

9. A pole piece, characterized in that: include: The current collector according to any one of claims 1 to 8; A first active material layer, coated on the first conductive layer; The second active material layer is coated on the second conductive layer.

10. The pole piece according to claim 9, characterized in that: The first active material layer and the second active material layer have opposite polarities.

11. A battery cell, characterized in that: Including the pole piece as described in claim 9 or 10.

12. A vehicle, characterized in that Comprising the battery cell as claimed in claim 11.

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