CN221596536U - A pole piece assembly, battery and electrical equipment - Google Patents
A pole piece assembly, battery and electrical equipment Download PDFInfo
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- CN221596536U CN221596536U CN202323289327.9U CN202323289327U CN221596536U CN 221596536 U CN221596536 U CN 221596536U CN 202323289327 U CN202323289327 U CN 202323289327U CN 221596536 U CN221596536 U CN 221596536U
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Abstract
本申请提供了一种极片组件、电池及用电设备，极片组件包括正极片、负极片以及设置于正极片和负极片之间的隔膜，第一活性物质层开设有第一凹槽，正集流体部分暴漏于第一凹槽，正极耳位于第一凹槽内并与正集流体连接；第一活性物质层和第二活性物质层中的一者上开设第二凹槽；第一保护层设置于隔膜和正极片之间，且朝向第一凹槽的第二活性物质层上未设置保护层；在垂直正极片的方向上，第一凹槽的投影位于第一保护层内，第一保护层的投影位于第二凹槽内，第一凹槽的投影位于第二凹槽内。如此设置就能减少由极耳和保护胶导致的无效厚度，减少电池厚度的增加量，或者能够避免电池厚度增加，从而提升电池的能量密度，提升客户的使用感受。
The present application provides a pole piece assembly, a battery and an electrical device, wherein the pole piece assembly includes a positive pole piece, a negative pole piece and a separator disposed between the positive pole piece and the negative pole piece, wherein a first groove is provided in the first active material layer, a positive current collector is partially exposed in the first groove, and a positive pole ear is located in the first groove and connected to the positive current collector; a second groove is provided on one of the first active material layer and the second active material layer; a first protective layer is provided between the separator and the positive pole piece, and no protective layer is provided on the second active material layer facing the first groove; in a direction perpendicular to the positive pole piece, a projection of the first groove is located in the first protective layer, a projection of the first protective layer is located in the second groove, and a projection of the first groove is located in the second groove. Such a configuration can reduce the ineffective thickness caused by the pole ear and the protective glue, reduce the increase in the battery thickness, or avoid an increase in the battery thickness, thereby improving the energy density of the battery and enhancing the user experience of the customer.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a pole piece assembly, a battery and electric equipment.
Background
In order to improve the quick charge performance of the battery, a lug middle structure in a lithium ion battery is commonly applied, namely, the lug is welded in the middle of a pole piece, so that the internal resistance of the battery can be effectively reduced, and the quick charge effect is achieved. However, the structure in the tab brings a lot of problems, such as the need to paste a protective adhesive at the position in the tab to avoid the safety problem caused by the fact that the welding spot of the tab pierces the diaphragm; this results in tabs at the tab locations, protrusions of the protective paste causing an increase in the ineffective thickness of the battery, an increase in the thickness of the battery and a decrease in the energy density of the battery, and affecting the customer's use experience.
Disclosure of utility model
In view of the above, the present application provides a pole piece assembly, which solves the problems of increasing the thickness of the battery, reducing the energy density of the battery, and affecting the use feeling of customers. The application also provides a battery comprising the pole piece assembly. The application also provides electric equipment comprising the battery.
In order to achieve the above purpose, the present application provides the following technical solutions:
The pole piece assembly comprises a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece, the pole piece assembly further comprises a positive pole lug and a first protective layer, the positive pole piece comprises a positive current collector and a first active material layer arranged on at least one side surface of the positive current collector, the negative pole piece comprises a negative current collector and a second active material layer arranged on at least one side of the negative current collector,
The first active material layer is provided with a first groove, the positive current collector part is exposed in the first groove, the positive electrode lug is positioned in the first groove and connected with the positive current collector;
A second groove is formed in one of the first active material layer and the second active material layer;
The first protective layer is arranged between the diaphragm and the positive plate, and no protective layer is arranged on the second active material layer facing the first groove;
And in the direction perpendicular to the positive plate, the projection of the first groove is positioned in the first protection layer, the projection of the first protection layer is positioned in the second groove, and the projection of the first groove is positioned in the second groove.
Optionally, in a direction perpendicular to the positive plate, a sum of a thickness of the positive tab and a thickness of the first protective layer is less than or equal to a sum of depths of the first groove and the second groove; and the thickness of the first protective layer is smaller than or equal to the depth of the second groove.
Optionally, the positive electrode further comprises a third groove formed in one of the first active material layer and the second active material layer, wherein in the direction perpendicular to the positive electrode sheet, the projection of the first protective layer is positioned in the third groove, and the sum of the thickness of the positive electrode lug and the thickness of the first protective layer is smaller than or equal to the sum of the depths of the first groove, the second groove and the third groove; and the thickness of the first protective layer is smaller than the sum of the depths of the second groove and the third groove.
Optionally, the positive electrode tab further comprises a fourth groove formed in one of the first active material layer and the second active material layer, wherein in a direction perpendicular to the positive electrode tab, a projection of the positive electrode tab is located in the fourth groove, a projection of the fourth groove is located in the first protection layer, and a sum of a thickness of the positive electrode tab and a thickness of the first protection layer is smaller than or equal to a sum of depths of the first groove, the second groove and the fourth groove; and the thickness of the first protective layer is smaller than or equal to the depth of the second groove.
Optionally, the lithium ion battery further comprises a second protection layer arranged on one side of the diaphragm, close to the negative electrode plate, and in the direction perpendicular to the positive electrode plate, the projection of the second protection layer is positioned in the second groove; the sum of the thickness of the positive electrode lug, the thickness of the first protective layer and the thickness of the second protective layer is smaller than or equal to the sum of the depths of the first groove and the second groove; and the sum of the thicknesses of the first protective layer and the second protective layer is smaller than or equal to the depth of the second groove.
Optionally, the lithium ion battery further comprises a fifth groove formed in any one of the first active material layer and the second active material layer, and a third protective layer arranged on one side of the diaphragm, which is close to the negative plate, wherein in the direction perpendicular to the positive plate, the projection of the third protective layer is positioned in the fifth groove; the sum of the thicknesses of the positive electrode lug, the first protective layer and the third protective layer is smaller than or equal to the sum of the depths of the first groove, the second groove and the fifth groove; and the sum of the thicknesses of the first protective layer and the third protective layer is smaller than or equal to the sum of the depths of the second groove and the fifth groove.
Optionally, the first protection layers are at least two, and in the direction perpendicular to the positive plate, the at least two first protection layers are respectively disposed on two sides of the positive plate.
Optionally, the second grooves are at least two, and in a direction perpendicular to the positive plate, the at least two second grooves are respectively disposed on two sides of the positive plate.
Optionally, in a direction perpendicular to the positive electrode sheet, a projection of the third groove is located in the second groove, and/or a depth of the third groove is smaller than a depth of the second groove.
Alternatively to this, the method may comprise,
When the second groove, the third groove and/or the fourth groove are/is arranged on the first active material layer, the distance between the bottom of the second groove, the third groove and/or the fourth groove and the positive current collector, which are arranged on the first active material layer, is more than or equal to 1 mu m; and/or the number of the groups of groups,
When the second groove, the third groove and/or the fourth groove are/is arranged on the second active material layer, the distance between the bottom of the second groove, the third groove and/or the fourth groove and the negative current collector, which are arranged on the second active material layer, is more than or equal to 1 mu m.
Alternatively to this, the method may comprise,
In the length direction of the positive plate, the width of the first protective layer is N, and the width of the second groove is M, wherein M and N satisfy the following conditions: n is more than or equal to M and less than or equal to N+2mm; and/or the number of the groups of groups,
In the width direction of the positive plate, the length of the first protection layer is Q, and the length of the second groove is P, wherein Q and P satisfy the following conditions: q is more than or equal to P and less than or equal to Q+2mm.
Alternatively to this, the method may comprise,
On the length direction of the positive plate, the width of the fourth groove is L, the width of the welding end of the positive lug is K, and L and K satisfy the following conditions: k is more than or equal to L and less than or equal to K+4mm; and/or the number of the groups of groups,
In the width direction of the positive plate, the length of the fourth groove is R, and the length of the welding end of the positive tab is S, wherein R and S satisfy the following conditions: s is more than or equal to R and less than or equal to S+4mm.
A battery comprising a pole piece assembly as claimed in any one of the preceding claims.
An electric device comprises the battery.
According to the pole piece assembly provided by the application, the second groove is formed in one of the first active material layer and the second active material layer, the first protective layer is arranged between the diaphragm and the positive pole piece, the projection of the positive pole lug is positioned in the first protective layer in the direction perpendicular to the positive pole piece, the projection of the first protective layer is positioned in the second groove, and the projection of the first groove is positioned in the second groove.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a pole piece assembly according to a first embodiment provided in this embodiment;
FIG. 2 is a schematic illustration of a pole piece assembly in a second embodiment;
FIG. 3 is a schematic view of a pole piece assembly in a third embodiment;
FIG. 4 is a schematic view of a pole piece assembly in a fourth embodiment;
FIG. 5 is a schematic view of a pole piece assembly of a fifth embodiment;
FIG. 6 is a schematic view of a pole piece assembly of a sixth embodiment;
FIG. 7 is a schematic view of a pole piece assembly of a seventh embodiment;
FIG. 8 is a schematic view of a pole piece assembly in an eighth embodiment;
FIG. 9 is a schematic view of a pole piece assembly of a ninth embodiment;
fig. 10 is a schematic view of a pole piece assembly in a tenth embodiment.
In fig. 1-10:
1-positive plate, 2-negative plate, 3-diaphragm, 4-positive tab, 5-first protective layer, 6-second protective layer, 7-third protective layer, 8-first groove, 9-second groove, 10-third groove, 11-fourth groove and 12-fifth groove;
101-positive current collector, 102-first active material layer, 201-negative current collector, 202-second active material layer.
Detailed Description
The application provides a pole piece assembly. The application also provides a battery comprising the pole piece assembly. The application also provides electric equipment comprising the battery.
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in fig. 1 to 10, the embodiment of the present application provides a pole piece assembly, which is wound to form a winding structure, and then the winding structure may be combined with a case, an electrolyte, etc. to form a battery. The pole piece assembly mainly comprises a positive pole piece 1, a negative pole piece 2 and a diaphragm 3 arranged between the positive pole piece 1 and the negative pole piece 2, the pole piece assembly further comprises a positive pole lug 4 and a first protective layer 5, the positive pole piece 1 comprises a positive current collector 101 and a first active material layer 102 arranged on the surface of at least one side of the positive current collector 101, and the negative pole piece 2 comprises a negative current collector 201 and a second active material layer 202 arranged on the surface of at least one side of the negative current collector 201. The first active material layer 102 is provided with a first groove 8, a positive current collector 101 is partially exposed in the first groove 8, and the positive electrode lug 4 is positioned in the first groove 8 and connected with the positive current collector 101; the first recess 8 may be formed at a position where the first active material layer 102 is provided on both sides of the positive current collector 101, or at a position where the active material layer is provided on one side of the positive current collector 101; the positive electrode lug 4 is arranged in the first groove 8 and is connected with the positive current collector 101, so that the positive electrode lug 4 and the positive current collector 101 can be connected, and when the first groove 8 is arranged at the position where the first active material layers 102 are arranged on two sides of the positive current collector 101, the position is the middle position of the winding structure, and the positive electrode lug 4 is arranged at the position so as to realize the rapid charging of the battery formed by the winding structure.
Further, a second groove 9 is formed in one of the first active material layer 102 and the second active material layer 202; the first protective layer 5 is arranged between the separator 3 and the positive electrode sheet 1, and no protective layer is arranged on the second active material layer 202 facing the first groove 8; wherein, in the direction of perpendicular positive plate 1, the projection of anodal ear 4 is located first protective layer 5, and the projection of first recess 8 is located first protective layer 5, and the projection of first protective layer 5 is located second recess 9, and the projection of first recess 8 is located second recess 9. After the positive electrode lug 4 is welded to the positive current collector 101, a lug welding point is formed, the formed lug welding point is sharp and possibly punctures the diaphragm 3, so that the positive electrode lug 4 is in contact with the negative electrode plate 2, a safety problem is caused, a first protection layer 5 is arranged between the diaphragm 3 and the positive electrode plate 1, in addition, in the direction perpendicular to the positive electrode lug 4, the projection of the positive electrode lug 4 is positioned in the first protection layer 5, the diaphragm 3 can be prevented from being punctured by the lug welding point, and the battery is prevented from being shorted. Because the first protection layer 5 is provided, the first protection layer 5 can overlap to the positions of the two ends of the notch of the first groove 8, the first protection layer 5 overlapping to the positions of the two ends of the notch can increase the thickness of the pole piece assembly, the second groove 9 is formed in one of the first active material layer 102 and the second active material layer 202, and in the direction perpendicular to the positive pole piece 1, the projection of the first protection layer 5 is located in the second groove 9, and the ineffective thickness generated by the first protection layer 5 can be counteracted by the second groove 9. Correspondingly, when the thickness of the positive tab 4 exceeds the depth of the first groove 8, the second groove 9 also serves to offset the thickness of the positive tab 4, thereby increasing the energy density of the battery formed from the pole piece assembly.
It should be noted that, the first protection layer 5 is disposed between the separator 3 and the positive plate 1, where the first protection layer 5 may be disposed on a side of the first active material layer 102 near the separator 3, or may be disposed on a side of the separator 3 near the first active material layer 102, after the pole piece assembly is formed into a winding structure, the first protection layer 5 may be ensured to cover an upper side of the positive plate 1, so as to avoid the welding spot of the positive electrode tab 4 from piercing the separator 3, and play a role in protecting a battery. On this basis, no protective layer is provided on the second active material layer 202 facing the first groove 8, meaning that the protective layer not provided on the second active material layer 202 facing the first groove 8 is similar in structure to the first protective layer 5, and the second active material layer 202 facing the first groove 8 refers to the second active material layer 202 adjacent to the first groove 8 and corresponding to the first groove 8.
The direction perpendicular to the positive electrode sheet 1 is the direction indicated by the double-headed arrow Y in fig. 1.
It should be noted that, the first protective layer 5 is usually an insulating adhesive paper, the thickness of the insulating adhesive paper in the direction perpendicular to the positive plate 1 is usually 8 μm to 22 μm, and the thickness of the insulating adhesive paper is usually 10 μm to 16 μm, so that the depth of the second groove 9 is 8 μm to 22 μm, and the depth of the second groove 9 is required to be equal to or greater than the thickness of the first protective layer 5. The first protective layer 5 may also be a liquid glue or other insulating and protective material.
It should be noted that, fig. 1 is a schematic diagram of the second groove 9 being opened on the first active material layer 102 and the first protection layer 5 being disposed on the first active material layer 102, fig. 2 is a schematic diagram of the second groove 9 being opened on the first active material layer 102 and the first protection layer 5 being disposed on the membrane 3, fig. 3 is a schematic diagram of the second groove 9 being opened on the second active material layer 202 and the first protection layer 5 being disposed on the first active material layer 102, and fig. 4 is a schematic diagram of the second groove 9 being opened on the second active material layer 202 and the first protection layer 5 being disposed on the membrane 3.
It should be noted that the number of the first grooves 8 and the first protective layers 5 is not limited, and one or more first grooves 8 and one or more first protective layers 5 may be provided.
The pole piece assembly of the structure is provided with the second groove 9 on one of the first active material layer 102 and the second active material layer 202, the first protective layer 5 is arranged between the diaphragm 3 and the positive plate 1, the projection of the first groove 8 is positioned in the first protective layer 5 in the direction perpendicular to the positive plate 1, the projection of the first protective layer 5 is positioned in the second groove 9, the projection of the first groove 8 is positioned in the second groove 9, an accommodating space can be provided for the first protective layer 5 by arranging the second groove 9, the invalid thickness caused by the pole lugs and the protective adhesive can be reduced by arranging the second groove 9, the increase of the thickness of the battery can be reduced, or the increase of the thickness of the battery can be avoided, thereby improving the energy density of the battery and the use feeling of a customer.
In some embodiments, the sum of the thickness of the positive electrode tab 4 and the thickness of the first protective layer 5 is less than or equal to the sum of the depths of the first groove 8 and the second groove 9 in the direction perpendicular to the positive electrode sheet 1; and the thickness of the first protection layer 5 is less than or equal to the depth of the second groove 9. The thickness of the positive electrode tab 4 refers to the dimension in the direction perpendicular to the positive electrode sheet 1; the thickness of the first protective layer 5 refers to the dimension in the direction perpendicular to the positive electrode sheet 1; the depth of the first groove 8 refers to the dimension in the direction perpendicular to the positive electrode sheet 1, and it is further noted that, when the first groove 8 and the second groove 9 are both provided on the same active material layer, that is, in the state of fig. 1 or 2, the depth of the first groove 8 refers to the dimension between the groove bottom of the first groove 8 and the groove bottom of the second groove 9; the depth of the second groove 9 refers to the dimension of the second groove 9 in the direction perpendicular to the positive electrode sheet 1.
Specifically, the sum of the thickness of the positive electrode tab 4 and the thickness of the first protective layer 5 is less than or equal to the sum of the depths of the first groove 8 and the second groove 9, so that the thickness of the region where the positive electrode tab 4 is arranged is less than or equal to the thickness of the region where the positive electrode tab 4 is not arranged, and the invalid thickness of the region where the positive electrode tab 4 is arranged can be avoided. Further, the thickness of the first protection layer 5 is ensured to be smaller than or equal to the depth of the second groove 9, and the length of the first protection layer 5 needs to be larger than the length of the first groove 8 in the length direction of the positive plate 1, so that the first protection layer 5 can be ensured to completely cover the positive electrode lug 4, the thickness of the first protection layer 5 is ensured to be smaller than or equal to the depth of the second groove 9, the thickness of the first protection layer 5 area can be enabled to be smaller than or equal to the thickness of the first protection layer 5 area which is not set, and therefore invalid thickness generated in the first protection layer 5 area can be avoided.
It should be noted that, when the sum of the thickness of the positive electrode tab 4 and the thickness of the first protective layer 5 is less than or equal to the sum of the depths of the first groove 8 and the second groove 9, since the first protective layer 5 has a certain ductility, there may be a certain machining error during installation, that is, the sum of the thickness of the positive electrode tab 4 and the thickness of the first protective layer 5 is allowed to be slightly greater than the sum of the depths of the first groove 8 and the second groove 9, and the machining error is generally within 4 μm.
It should be further noted that, since the positive tab 4 may be deformed or the thickness of the positive tab 4 may be changed when the positive tab 4 is welded to the positive current collector 101, in this embodiment, the sum of the thickness of the positive tab 4 and the thickness of the first protection layer 5 is less than or equal to the sum of the depths of the first groove 8 and the second groove 9, wherein the thickness of the positive tab 4 refers to the thickness of the whole welded part after the welding formation of the positive tab 4.
In some embodiments, referring to fig. 5, the pole piece assembly further includes a third groove 10 formed on one of the first active material layer 102 and the second active material layer 202, wherein, in a direction perpendicular to the positive pole piece 1, a projection of the first protective layer 5 is located in the third groove 10, and a sum of a thickness of the positive pole tab 4 and a thickness of the first protective layer 5 is less than or equal to a sum of depths of the first groove 8, the second groove 9 and the third groove 10; and the thickness of the first protection layer 5 is smaller than the sum of the depths of the second groove 9 and the third groove 10. This can cancel the thicknesses of the positive electrode tab 4 and the first protective layer 5 beyond the first active material layer 102 and the second active material layer 202 in the direction perpendicular to the positive electrode sheet 1, and can avoid the occurrence of ineffective thicknesses. And the sum of the depths of the second groove 9 and the third groove 10 in this embodiment, together cancel the thickness of the first protective layer 5; the first, second and third grooves 8, 9 and 10 can also offset the thickness of the positive tab 4.
Regarding the opening positions of the second groove 9 and the third groove 10, the second groove 9 is illustratively opened on the first active material layer 102, and the third groove 10 is opened on the second active material layer; the second groove 9 is arranged on the second active material layer 202, and the third groove 10 is arranged on the first active material layer 102; the second groove 9 and the third groove 10 are respectively arranged on the first active material layer 102; the second recess 9 and the third recess 10 are both open on the second active material layer 202.
Further, on the basis of the above embodiment, in the direction perpendicular to the positive electrode sheet 1, the projection of the third groove 10 is located within the second groove 9, and/or the depth of the third groove 10 is smaller than the depth of the second groove 9. Specifically, taking the example of forming the second groove 9 on the first active material layer 102 and forming the third groove 10 on the second active material layer 202, the projection of the second groove 9 and the third groove 10 and the depth of the second groove 9 and the third groove 10 refer to parameters in the direction perpendicular to the positive electrode sheet 1.
In this embodiment, an alternative embodiment is provided, where the depths of the grooves of the third groove 10 and the second groove 9 are the same, and the projection of the third groove 10 is located in the second groove 9, that is, the size of the second groove 9 is larger than the size of the third groove 10 in the direction of the double arrow X, so that the volume of the first active material layer 102 on the positive electrode sheet 1 is smaller than the size of the second active material layer 202 on the negative electrode sheet 2, so that lithium precipitation of the negative electrode sheet 2 can be avoided when the battery formed by the above-mentioned electrode sheet assembly is charged.
In this embodiment, an alternative embodiment is also provided, where the third groove 10 and the second groove 9 are projected to overlap, and the depth of the third groove 10 is smaller than the depth of the second groove 9, that is, the depth of the second groove 9 is greater than the depth of the third groove 10 in the direction indicated by the double-headed arrow Y, so that the volume of the first active material layer 102 on the positive electrode sheet 1 is smaller than the size of the second active material layer 202 on the negative electrode sheet 2, and thus, lithium precipitation of the negative electrode sheet 2 can be avoided when the battery formed by the above-mentioned electrode sheet assembly is charged.
In this embodiment, a further alternative embodiment is provided, where the projection of the third groove 10 is located in the second groove 9, and the depth of the third groove 10 is smaller than the depth of the second groove 9, so that the volume of the first active material layer 102 on the positive electrode sheet 1 is further ensured to be smaller than the size of the second active material layer 202 on the negative electrode sheet 2, so that lithium precipitation from the negative electrode sheet 2 can be further avoided when the battery formed by the above-mentioned electrode sheet assembly is charged.
It should be noted that, when the third groove 10 is formed in the first active material layer 102 and the second groove 9 is formed in the second active material layer 202, in the direction perpendicular to the positive electrode sheet 1, the projection of the second groove 9 is located in the third groove 10, and/or, in the case where the depth of the second groove 9 is smaller than the depth of the third groove 10, the lithium precipitation of the negative electrode sheet 2 can be avoided by such a configuration.
In some embodiments, referring to fig. 6 and 7, the pole piece assembly further includes a fourth groove 11 formed on one of the first active material layer 102 and the second active material layer 202, in a direction perpendicular to the positive pole piece 1, a projection of the positive pole tab 4 is located in the fourth groove 11, and a projection of the fourth groove 11 is located in the first protection layer 5, and a sum of a thickness of the positive pole tab 4 and a thickness of the first protection layer 5 is less than or equal to a sum of depths of the first groove 8, the second groove 9 and the fourth groove 11; and the thickness of the first protection layer 5 is less than or equal to the depth of the second groove 9. This can cancel the thicknesses of the positive electrode tab 4 and the first protective layer 5 beyond the first active material layer 102 and the second active material layer 202 in the direction perpendicular to the positive electrode sheet 1, and an ineffective thickness can be avoided. And the depth of the second groove 9 in this embodiment counteracts the thickness of the first protective layer 5, the sum of the depths of the first groove 8 and the fourth groove 11 counteracts the thickness of the positive electrode tab 4, or the sum of the depths of the first groove 8, the second groove 9 and the fourth groove 11 counteracts the thickness of the positive electrode tab 4. Here, the projection of the positive electrode tab 4 is ensured to be located in the fourth groove 11, so that the depth of the fourth groove 11 can offset the ineffective thickness of the positive electrode tab 4 exceeding the first groove, further, the projection of the fourth groove 11 is ensured to be located in the first protection layer 5, the projection of the first protection layer 5 is ensured to be located in the second groove 9, the projection of the fourth groove 11 is ensured to be located in the second groove 9, and the grooving volume on the first active material layer 102 is larger than the grooving volume on the second active material layer 202, so that lithium precipitation of the negative electrode sheet 2 can be avoided when the battery formed by the electrode sheet assembly is charged.
Regarding the opening positions of the second groove 9 and the fourth groove 11, illustratively, the second groove 9 is opened on the first active material layer 102, and the fourth groove 11 is opened on the second active material layer; the second groove 9 is arranged on the second active material layer 202, and the fourth groove 11 is arranged on the first active material layer 102; the second groove 9 and the fourth groove 11 are respectively arranged on the first active material layer 102; the second recess 9 and the fourth recess 11 are both open on the second active material layer 202.
In some embodiments, referring to fig. 8, the pole piece assembly further includes a second protection layer 6 disposed on a side of the separator 3 near the negative pole piece 2, and in a direction perpendicular to the positive pole piece 1, a projection of the second protection layer 6 is located in the second groove 9; the sum of the thickness of the positive electrode lug 4 and the thicknesses of the first protective layer 5 and the second protective layer 6 is less than or equal to the sum of the depths of the first groove 8 and the second groove 9; and the sum of the thicknesses of the first protective layer 5 and the second protective layer 6 is less than or equal to the depth of the second groove 9. This can cancel out the thicknesses of the positive electrode tab 4, the first protective layer 5, and the second protective layer 6 beyond the first active material layer 102 and the second active material layer 202 in the direction perpendicular to the positive electrode sheet 1, and can avoid ineffective thicknesses. And the depth of the second groove 9 in this embodiment counteracts the thickness of the first protective layer 5 and the thickness of the second protective layer 6 at the same time, or the first groove 8 and the second groove 9 together counteract the thickness of the positive electrode tab 4.
The second groove 9 may be disposed on the first active material layer 102 or may be disposed on the second active material layer 202; and the second protection layer 6 is arranged on one side of the diaphragm 3 close to the negative electrode plate 2, and the first protection layer 5 can be arranged on one side of the positive electrode plate 1 close to the diaphragm 3 or on one side of the diaphragm 3 close to the positive electrode plate 1.
In some embodiments, referring to fig. 9 and 10, the pole piece assembly further includes a fifth groove 12 formed on any one of the first active material layer 102 and the second active material layer 202, and a third protection layer 7 disposed on one side of the separator 3 near the negative pole piece 2, wherein in a direction perpendicular to the positive pole piece 1, a projection of the third protection layer 7 is located in the fifth groove 12; the sum of the thicknesses of the positive electrode tab 4, the first protective layer 5 and the third protective layer 7 is less than or equal to the sum of the depths of the first groove 8, the second groove 9 and the fifth groove 12; and the sum of the thicknesses of the first protective layer 5 and the third protective layer 7 is less than or equal to the sum of the depths of the second groove 9 and the fifth groove 12. In this way, the sum of the depths of the first groove 8, the second groove 9, and the fifth groove 12 can cancel out the thicknesses of the positive electrode tab 4, the first protective layer 5, and the third protective layer 7 beyond the first active material layer 102 and the second active material layer 202 in the direction perpendicular to the positive electrode sheet 1, and an ineffective thickness can be avoided. And in this embodiment the sum of the depths of the second and fifth recesses 9, 12 together counteracts the sum of the thicknesses of the first and third protective layers 5, 7.
Regarding the arrangement positions of the second groove 9 and the fifth groove 12, illustratively, the second groove 9 is opened on the first active material layer 102, and the fifth groove 12 is opened on the second active material layer; the second groove 9 is formed on the second active material layer 202, and the fifth groove 12 is formed on the first active material layer 102; the second groove 9 and the fifth groove 12 are both arranged on the first active material layer 102; the second recess 9 and the fifth recess 12 are both open on the second active material layer 202. Regarding the arrangement positions of the first protective layer 5 and the third protective layer 7, the third protective layer 7 is illustratively arranged on the side of the separator 3 close to the negative electrode sheet 2, and the first protective layer 5 may be arranged on the side of the positive electrode sheet 1 close to the separator 3, or may be arranged on the side of the separator 3 close to the positive electrode sheet 1.
Further, in this embodiment, in the length direction of the positive electrode sheet 1, the length of the first protective layer 5 is greater than the length of the third protective layer 7, after the electrode sheet assembly is assembled into a winding structure, the first protective layer 5 is attached to the first active material layer 102, and the third protective layer 7 is attached to the second active material layer 202, so that the coverage of the first protective layer 5 to the first active material layer 102 is greater than the coverage of the third protective layer 7 to the second active material layer 202, and in this way, the exposed area of the second active material layer 202 is ensured to be greater than the exposed area of the first active material layer 102, and after the electrode sheet assembly is processed into a battery, lithium precipitation of the negative electrode sheet 2 can be avoided in the charge-discharge process.
In some embodiments, referring to fig. 1 to 10, at least two first protection layers 5 are provided, and in a direction perpendicular to the positive electrode sheet 1, at least two first protection layers 5 are respectively provided at both sides of the positive electrode sheet 1. Specifically, the first protection layer 5 is provided in two or more, and two first protection layers 5 are exemplarily provided for two first protection layers 5, and in a direction perpendicular to the positive electrode sheet 1, the two first protection layers 5 are respectively located at two sides of the positive electrode sheet 1. This is because, when the first grooves 8 are formed in the first active material layer 102, in order to increase the accommodation space in the positive electrode sheet 1, the first grooves 8 are generally formed in the first active material layer 102 on both sides of the positive current collector 101, and in order to prevent the other side of the positive current collector 101 from contacting the negative electrode sheet 2 adjacent to the other side, the first protective layer 5 is also formed on the other side, so that the protective effect of the first protective layer 5 can be further improved, and the safety performance of the battery can be improved.
Further, the first protective layers 5 located at both sides of the positive electrode sheet 1 are the same in thickness in the direction perpendicular to the positive electrode sheet 1. In the direction of perpendicular positive plate 1, guarantee that the thickness that is located the first protective layer 5 of positive plate 1 both sides is the same, so set up, can be after assembling into the electric core with above-mentioned pole piece subassembly, the thickness of the protective layer of positive tab 4 both sides is the same, the protective effect of the first protective layer 5 that is located both sides to positive tab 4 is similar. Moreover, the thicknesses of the first protection layers 5 on the two sides of the positive plate 1 are the same, so that after the pole piece assembly is assembled into a battery, the positive lugs 4 between the negative plates 2 on the two sides are ensured to be approximately arranged in the middle.
In addition, the second protective layers 6 are provided with at least two, and at least two second protective layers 6 are provided on both sides of the positive electrode sheet 1; correspondingly, at least two third protection layers 7 are arranged, and at least two third protection layers 7 are arranged on two sides of the positive plate 1. The second protection layer 6 and the third protection layer 7 are arranged on two sides of the positive plate 1, so that the first protection layers 5 arranged on two sides of the positive plate 1 can be matched, and the positive electrode lug 4 is subjected to double protection.
In some embodiments, the second grooves 9 are provided in at least two, and in a direction perpendicular to the positive electrode sheet 1, the at least two second grooves 9 are provided on both sides of the positive electrode sheet 1, respectively. It should be noted that the number of the second grooves 9 and the number of the first protective layers 5 may be the same, that is, the first second grooves 9 accommodate one first protective layer 5; the number of second grooves 9 and the number of first protective layers 5 may also be different, i.e. one second groove 9 accommodates a plurality of first protective layers 5, or a plurality of second grooves 9 accommodates one first protective layer 5. The second grooves 9 are formed on two sides of the positive plate 1, so that the active material layer can be grooved simultaneously by two or more lasers during grooving, and the grooving efficiency is improved.
Further, in the direction perpendicular to the positive electrode sheet 1, the second grooves 9 located on both sides of the positive electrode sheet 1 are the same in thickness. So configured, after the battery is assembled using the pole piece assembly, the positive tab 4 between the two negative pole pieces 2 is ensured to be approximately centered.
In addition, at least two third grooves 10 are provided, and in the direction perpendicular to the positive electrode sheet 1, at least two third grooves 10 are provided on both sides of the positive electrode sheet 1, respectively; correspondingly, at least two fourth grooves 11 are arranged, and in the direction perpendicular to the positive plate 1, at least two fourth grooves 11 are respectively arranged on two sides of the positive plate 1; the fifth grooves 12 are provided with at least two, and in the direction perpendicular to the positive electrode sheet 1, the at least two fifth grooves 12 are provided on both sides of the positive electrode sheet 1, respectively. Through setting up third recess 10, fourth recess 11 and fifth recess 12 in the both sides of positive plate 1, can cooperate first protective layer 5, second protective layer 6 and the third protective layer 7 that set up in the both sides of positive plate 1 like this to the setting of first protective layer 5, second protective layer 6 and third protective layer 7 of being convenient for promotes pole piece assembly overall structure's compactness.
In the direction perpendicular to the positive plate 1, if the positive tab 4 is thicker, that is, when the single-sided slot of the positive plate 1 cannot completely offset the thickness of the positive tab 4 beyond the first groove 8, the other side of the positive plate 1 is also slotted, that is, slots are formed on both sides of the positive current collector 101, so that the ineffective thickness generated by the positive tab 4 is offset; thus, the machining efficiency of the double-sided slotting of the positive plate 1 is higher, and the double-sided slotting welding is more convenient. It should be noted that, when slotting on both sides of the positive plate 1, protective layers are required to be arranged on both sides of the positive plate 1, so as to avoid short circuit when the above-mentioned pole plate assembly is assembled into a battery to work, and improve safety.
In some embodiments, the first groove 8, the second groove 9, the third groove 10, the fourth groove 11, the fifth groove 12, the first protection layer 5, the second protection layer 6, and the third protection layer 7 are all provided with one, and the positive tab 4 is disposed on one side of the positive current collector 101, and the grooves and the protection layers are all disposed between the positive current collector 101 of the positive tab 4 and the negative current collector 201 near one side of the positive current collector 101. Specifically, the grooves and the protective layers are arranged on the same side of the positive current collector 101, and the other side of the positive current collector 101 is not provided with grooves or protective layers, so that the number of the protective layers can be reduced, the increase of the ineffective thickness of the pole piece assembly is reduced, and materials can be saved; the number of the protective layers is reduced, so that the number of the grooves is reduced, or the overall opening depth of the grooves is reduced, so that the reduction amount of the first active material layer 102 and the second active material layer 202 is reduced, and the energy density of the battery formed by the pole piece assembly is improved; the first active material layer 102 on the positive current collector 101 side and the second active material layer 202 on the negative current collector 201 side are provided with grooves and a protective layer is attached, so that the workability of the pole piece assembly can be improved.
In some embodiments, when the second groove 9, the third groove 10 and/or the fourth groove 11 are/is formed on the first active material layer 102, a distance between a bottom of the second groove 9, the third groove 10 and/or the fourth groove 11 formed on the first active material layer 102 and the positive current collector 101 is 1 μm or more; and/or, when the second groove 9, the third groove 10 and/or the fourth groove 11 are/is opened on the second active material layer 202, a distance between a bottom of the groove of the second groove 9, the third groove 10 and/or the fourth groove 11, which are opened on the second active material layer 202, and the negative current collector 201 is greater than or equal to 1 μm. Specifically, the distance between the bottom of the second groove 9, the third groove 10 and/or the fourth groove 11 and the positive current collector 101 or the negative current collector 201 is ensured to be more than or equal to 1 μm, that is, the position where the second groove 9, the third groove 10 and/or the fourth groove 11 is not opened to the positive current collector 101 or the negative current collector 201 is located, and when unavoidable short circuit occurs at the position, the most dangerous short circuit between the positive current collector 101 and the second active material layer 202 or between the negative current collector 201 and the first active material layer 102 is avoided, and the risk of ignition of the lithium ion battery is reduced.
Illustratively, the distance between the groove bottoms of the second, third and/or fourth grooves 9, 10 and/or 11 and the positive current collector 101 or the negative current collector 201 may be: 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, etc.
In some embodiments, in the length direction of the positive electrode sheet 1, the width of the first protective layer 5 is N, and the width of the second groove 9 is M, where M and N satisfy: n is more than or equal to M and less than or equal to N+2mm. It should be noted that, the length direction of the positive plate 1 refers to the direction indicated by the double-headed arrow X in fig. 1, the width of the first protective layer 5 and the width of the second groove 9 both refer to the dimensions in the length direction of the positive plate 1, so that the relationship between the width of the first protective layer 5 and the width of the second groove 9 satisfies the above relationship, and a gap of 0-2 mm is reserved between the first protective layer 5 and the second groove 9 in the length direction of the positive plate 1, thereby improving the yield and efficiency of production, and the electrolyte can be stored during the gap to improve the liquid retention capacity of the battery and the cycle life of the lithium ion battery.
It should be noted that, in the length direction of the positive electrode sheet 1, the midpoints of the first protective layer 5 and the second groove 9 coincide, so that the distances from the two ends of the first protective layer 5 to the two ends of the second groove 9 are equal.
In the width direction of the positive electrode sheet 1, the length of the first protective layer 5 is Q, and the length of the second groove 9 is P, where Q and P satisfy: q is more than or equal to P and less than or equal to Q+2mm. It should be noted that, the width direction of the positive plate 1 is not shown in the figure, the width direction of the positive plate 1 refers to the direction of the double-headed arrow X and the double-headed arrow Y in fig. 1, and the length of the first protection layer 5 and the length of the second groove 9 refer to the dimension in the width direction of the positive plate 1, so that the relationship between the length of the first protection layer 5 and the length of the second groove 9 satisfies the above relationship, that is, a gap of 0-2 mm is reserved between the first protection layer 5 and the second groove 9 in the width direction of the positive plate 1, the yield and the efficiency of production are improved, electrolyte can be stored in the gap to improve the liquid retention amount of the battery, and the cycle life of the lithium ion battery is prolonged.
Illustratively, the gap between the first protective layer 5 and the second groove 9 may be 0mm, 0.5mm, 1mm, 1.5mm, 2mm in the length direction of the positive electrode sheet 1; accordingly, the gap between the first protective layer 5 and the second groove 9 may be 0mm, 0.5mm, 1mm, 1.5mm, 2mm in the width direction of the positive electrode sheet 1.
In some embodiments, in the length direction of the positive electrode tab 1, the width of the fourth groove 11 is L, and the width of the welding end of the positive electrode tab is K, where L and K satisfy: k is more than or equal to L and less than or equal to K+4mm; it should be noted that, the length direction of the positive plate 1 refers to the direction indicated by the double-headed arrow X in fig. 1, the width of the fourth groove 11 and the width of the welding end of the positive tab both refer to the dimensions in the length direction of the positive plate 1, so that the relationship between the width of the fourth groove 11 and the width of the welding end of the positive tab is ensured to satisfy the above relationship, that is, a gap of 0-4 mm is reserved between the fourth groove 11 and the welding end of the positive tab in the length direction of the positive plate 1, the yield and efficiency of production are improved, electrolyte can be stored during the gap to improve the liquid retention capacity of the battery, and the cycle life of the lithium ion battery is improved.
In the width direction of the positive electrode tab 1, the length of the fourth groove 11 is R, and the length of the welding end of the positive electrode tab is S, where R and S satisfy: s is more than or equal to R and less than or equal to S+4mm; it should be noted that, the width direction of the positive plate 1 is not shown in the figure, the width direction of the positive plate 1 refers to the direction of the double-headed arrow X and the double-headed arrow Y in fig. 1, and the length of the fourth groove 11 and the length of the welding end of the positive tab both refer to the dimension in the width direction of the positive plate 1, so that the relationship between the length of the fourth groove 11 and the length of the welding end of the positive tab is ensured to satisfy the above relationship, that is, a gap of 0-4 mm is reserved between the fourth groove 11 and the welding end of the positive tab in the width direction of the positive plate 1, the yield and the efficiency of production are improved, electrolyte can be stored during the gap to improve the liquid retention capacity of the battery, and the cycle life of the lithium ion battery is prolonged.
The welding end of the positive tab refers to a portion of the positive tab welded to the positive current collector.
Illustratively, in the length direction of the positive electrode tab 1, the gap between the fourth groove 11 and the welding end of the positive electrode tab is 0mm, 1mm, 2mm, 3mm, 4mm; in the width direction of the positive electrode tab 1, the gap between the fourth groove 11 and the welding end of the positive electrode tab is 0mm, 1mm, 2mm, 3mm, 4mm.
A battery comprises the pole piece assembly. The beneficial effects of the battery caused by the pole piece assembly are described above, and are not described in detail herein.
An electric device comprises the battery. The beneficial effects brought by the battery of the electric equipment are shown in the above description, and are not repeated here.
The basic principles of the present application have been described above in connection with specific embodiments, but it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be construed as necessarily possessed by the various embodiments of the application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not necessarily limited to practice with the above described specific details.
The block diagrams of the devices, apparatuses, devices, systems referred to in the present application are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.
It is also noted that in the apparatus, devices and methods of the present application, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present application.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It should be understood that the terms "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are used for more clearly describing the technical solutions, and are not intended to limit the scope of the present application.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (14)
1. The pole piece assembly comprises a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece, the pole piece assembly further comprises a positive pole lug and a first protective layer, the positive pole piece comprises a positive current collector and a first active material layer arranged on at least one side surface of the positive current collector, the negative pole piece comprises a negative current collector and a second active material layer arranged on at least one side of the negative current collector, and the pole piece assembly is characterized in that,
The first active material layer is provided with a first groove, the positive current collector part is exposed in the first groove, the positive electrode lug is positioned in the first groove and connected with the positive current collector;
A second groove is formed in one of the first active material layer and the second active material layer;
The first protective layer is arranged between the diaphragm and the positive plate, and no protective layer is arranged on the second active material layer facing the first groove;
And in the direction perpendicular to the positive plate, the projection of the first groove is positioned in the first protection layer, the projection of the first protection layer is positioned in the second groove, and the projection of the first groove is positioned in the second groove.
2. The pole piece assembly of claim 1, wherein a sum of a thickness of the positive tab and a thickness of the first protective layer in a direction perpendicular to the positive tab is equal to or less than a sum of depths of the first and second grooves; and the thickness of the first protective layer is smaller than or equal to the depth of the second groove.
3. The pole piece assembly of claim 1, further comprising a third groove opening on one of the first active material layer and the second active material layer, a projection of the first protective layer being located within the third groove in a direction perpendicular to the positive electrode sheet, a sum of a thickness of the positive electrode tab and a thickness of the first protective layer being less than or equal to a sum of depths of the first groove, the second groove, and the third groove; and the thickness of the first protective layer is smaller than the sum of the depths of the second groove and the third groove.
4. The pole piece assembly of claim 1, further comprising a fourth groove opening on one of the first active material layer and the second active material layer, a projection of the positive pole tab being located within the fourth groove in a direction perpendicular to the positive pole tab, and a projection of the fourth groove being located within the first protective layer, a sum of a thickness of the positive pole tab and a thickness of the first protective layer being less than or equal to a sum of depths of the first groove, the second groove, and the fourth groove; and the thickness of the first protective layer is smaller than or equal to the depth of the second groove.
5. The pole piece assembly of claim 1, further comprising a second protective layer disposed on a side of the separator adjacent the negative pole piece, and wherein a projection of the second protective layer is located within the second recess in a direction perpendicular to the positive pole piece; the sum of the thickness of the positive electrode lug, the thickness of the first protective layer and the thickness of the second protective layer is smaller than or equal to the sum of the depths of the first groove and the second groove; and the sum of the thicknesses of the first protective layer and the second protective layer is smaller than or equal to the depth of the second groove.
6. The pole piece assembly of claim 1, further comprising a fifth groove provided on either one of the first active material layer and the second active material layer, and a third protective layer provided on a side of the separator adjacent to the negative pole piece, a projection of the third protective layer being located within the fifth groove in a direction perpendicular to the positive pole piece; the sum of the thicknesses of the positive electrode lug, the first protective layer and the third protective layer is smaller than or equal to the sum of the depths of the first groove, the second groove and the fifth groove; and the sum of the thicknesses of the first protective layer and the third protective layer is smaller than or equal to the sum of the depths of the second groove and the fifth groove.
7. The pole piece assembly of claim 1, wherein the first protective layers are provided in at least two, and at least two of the first protective layers are provided on both sides of the positive electrode sheet in a direction perpendicular to the positive electrode sheet, respectively.
8. The pole piece assembly according to claim 1 or 7, wherein at least two second grooves are provided, and at least two second grooves are provided on both sides of the positive electrode sheet in a direction perpendicular to the positive electrode sheet, respectively.
9. A pole piece assembly according to claim 3, wherein the projection of the third recess is located within the second recess in a direction perpendicular to the positive pole piece and/or the depth of the third recess is less than the depth of the second recess.
10. The pole piece assembly of claim 3 or 4, wherein,
When the second groove, the third groove and/or the fourth groove are/is arranged on the first active material layer, the distance between the bottom of the second groove, the third groove and/or the fourth groove and the positive current collector, which are arranged on the first active material layer, is more than or equal to 1 mu m; and/or the number of the groups of groups,
When the second groove, the third groove and/or the fourth groove are/is arranged on the second active material layer, the distance between the bottom of the second groove, the third groove and/or the fourth groove and the negative current collector, which are arranged on the second active material layer, is more than or equal to 1 mu m.
11. The pole piece assembly of claim 1, wherein the pole piece assembly comprises a plurality of pole pieces,
In the length direction of the positive plate, the width of the first protective layer is N, and the width of the second groove is M, wherein M and N satisfy the following conditions: n is more than or equal to M and less than or equal to N+2mm; and/or the number of the groups of groups,
In the width direction of the positive plate, the length of the first protection layer is Q, and the length of the second groove is P, wherein Q and P satisfy the following conditions: q is more than or equal to P and less than or equal to Q+2mm.
12. The pole piece assembly of claim 4, wherein,
On the length direction of the positive plate, the width of the fourth groove is L, the width of the welding end of the positive lug is K, and L and K satisfy the following conditions: k is more than or equal to L and less than or equal to K+4mm; and/or the number of the groups of groups,
In the width direction of the positive plate, the length of the fourth groove is R, and the length of the welding end of the positive tab is S, wherein R and S satisfy the following conditions: s is more than or equal to R and less than or equal to S+4mm.
13. A battery comprising a pole piece assembly as claimed in any one of claims 1 to 12.
14. A powered device comprising the battery of claim 13.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323289327.9U CN221596536U (en) | 2023-12-04 | 2023-12-04 | A pole piece assembly, battery and electrical equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323289327.9U CN221596536U (en) | 2023-12-04 | 2023-12-04 | A pole piece assembly, battery and electrical equipment |
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| CN221596536U true CN221596536U (en) | 2024-08-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120048849A (en) * | 2025-04-24 | 2025-05-27 | 珠海冠宇电池股份有限公司 | Battery and electronic device |
| WO2026092213A1 (en) * | 2024-10-31 | 2026-05-07 | 比亚迪股份有限公司 | Electrode sheet, battery, and electronic device |
-
2023
- 2023-12-04 CN CN202323289327.9U patent/CN221596536U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2026092213A1 (en) * | 2024-10-31 | 2026-05-07 | 比亚迪股份有限公司 | Electrode sheet, battery, and electronic device |
| CN120048849A (en) * | 2025-04-24 | 2025-05-27 | 珠海冠宇电池股份有限公司 | Battery and electronic device |
| CN120048849B (en) * | 2025-04-24 | 2025-09-12 | 珠海冠宇电池股份有限公司 | Battery and electronic device |
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