Battery pole core, battery, battery pack and electric equipment

Abstract

The invention provides a battery pole core, a battery, a battery pack and electric equipment. The battery pole core comprises a first pole piece and a second pole piece, wherein the first pole piece comprises a first pole piece body and at least one first pole lug, the first pole lug is connected to a first side edge of the first pole piece body and forms a first connecting part, the second pole piece comprises a second pole piece body and at least one second pole lug, and the second pole lug is connected to a third side edge of the second pole piece body and forms a second connecting part; the second pole piece and the first pole piece are stacked in an insulating mode, the at least one first connecting part and the at least one second connecting part are completely arranged in a staggered mode in the first direction, and the extending direction of the first pole lug deviates from the extending direction of the second pole lug. According to the invention, the problem that the service life of the battery is shortened due to failure of the edge of the connecting part of the tab and the pole core caused by lithium precipitation and sodium precipitation in the cycle process of the pole core due to high charge density at the connecting part of the tab and the pole core can be solved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] The battery is the power source that provides power for tools, mostly referring to the storage battery or rechargeable battery that powers electric cars, electric trains, electric bicycles, and golf carts.

[0003] Current batteries generally consist of a battery shell, a pole core and a cover assembly; the cover assembly is connected to the battery shell and encloses a mounting cavity, the pole core is arranged in the mounting cavity, and is connected to the cover assembly through the pole ears on the pole core.

[0004] In the related art, there is a problem of high charge density at the connection between the tab and the core, which causes lithium and sodium deposition in the core during the cycle, resulting in failure of the edge of the connection between the tab and the core, thereby reducing the service life of the battery. Summary of the Invention

[0005] The embodiments of the present application provide a battery core, a battery, a battery pack, and an electrical device. By completely staggering the first connecting portion and the second connecting portion, the current density between the positive and negative electrode tabs can be made more uniform during rapid charging and discharging of the positive and negative electrode sheets, so as to solve the problem that the charge density at the connection between the tabs and the core is high, thereby causing lithium and sodium deposition in the core during the cycle, resulting in failure of the edge of the connection between the tabs and the core, and thus reducing the service life of the battery.

[0006] The embodiments of this application provide the following technical solutions:

[0007] In a first aspect, the present application provides a battery core, comprising:

[0008] A first pole piece, the first pole piece includes a first pole piece body and at least one first pole tab, the first pole tab is connected to a first side of the first pole piece body and constitutes a first connecting portion;

[0009] A second pole piece, the second pole piece comprising a second pole piece body and at least one second pole tab, the second pole tab being connected to a third side edge of the second pole piece body and constituting a second connecting portion;

[0010] The second pole piece is insulated and stacked with the first pole piece;

[0011] Along the first direction, at least one first connecting portion and at least one second connecting portion are completely staggered;

[0012] The extension direction of the first electrode tab is opposite to the extension direction of the second electrode tab.

[0013] In some embodiments, the first pole piece has a plurality of first pole tabs, and the plurality of first connecting portions are spaced apart along the first direction; the second pole piece has a plurality of second pole tabs, and the plurality of second connecting portions are spaced apart along the first direction;

[0014] In the first direction, the plurality of first connection portions and the plurality of second connection portions are completely staggered.

[0015] In some embodiments, the first pole piece includes a plurality of first pole tabs.

[0016] A second connecting portion is provided in a gap between at least part of two adjacent first connecting portions along the first direction;

[0017] Along the first direction, the gap between two adjacent first connecting portions has a first distance L3;

[0018] Along the first direction, the second connecting portion has a first length A1;

[0019] The first distance L3 and the first length A1 satisfy:

[0020] L3≥A1.

[0021] In some embodiments, a second connection portion is provided in the gap between two adjacent first connection portions, and in the first direction, the second connection portion and the two adjacent first connection portions are completely staggered, and the first distance L3 and the first length A1 satisfy:

[0022] L3=n*A1;

[0023] Wherein, n≥1, and n is an integer.

[0024] In some embodiments, the first distance L3 and the first length A1 satisfy: L3=3*A1;

[0025] Along the first direction, gaps between the second connection portion and two adjacent first connection portions are equal.

[0026] In some embodiments, the second pole piece includes multiple second pole ears. Along the first direction, the gap length between two adjacent first connecting portions is equal to the length of the second connecting portion. The second connecting portion is arranged between the two first connecting portions so that the multiple first connecting portions and the multiple second connecting portions are alternately staggered.

[0027] In some embodiments, a plurality of second electrode tabs are provided, and the plurality of second electrode tabs are spaced apart along the first direction;

[0028] At least one first connection portion is provided in a gap between at least part of two adjacent second connection portions along the first direction, and the gap between the two adjacent second connection portions along the first direction has a second distance L4;

[0029] Along the first direction, the first connecting portion has a second length A2;

[0030] The second distance L4 and the second length A2 satisfy:

[0031] L4≥A2.

[0032] In some embodiments, a first connection portion is provided in a gap between at least part of two adjacent second connection portions along the first direction, and in the first direction, the first connection portion and the two adjacent second connection portions are completely staggered;

[0033] The second distance L4 and the second length A2 satisfy:

[0034] L4=m*A2;

[0035] Wherein, m≥1, m is an integer.

[0036] In some embodiments, along the first direction, gaps between a first connecting portion and two adjacent second connecting portions are equal.

[0037] In some embodiments, the first pole piece is provided with a plurality of first pole tabs, which are spaced apart along the first direction. Along the first direction, two first connection portions are provided in a gap between at least partially adjacent two second connection portions.

[0038] In some embodiments, along the first direction, two first connecting portions and two adjacent second connecting portions are completely staggered;

[0039] Along the first direction, the gap distances between the two first connection parts and the second connection part adjacent thereto are equal, and the gap distance between the second connection part and the first connection part adjacent thereto is equal to the gap distance between the two first connection parts.

[0040] In some embodiments, there are multiple first electrode tabs and multiple second electrode tabs, the multiple first electrode tabs have a first total flow area, the multiple second electrode tabs have a second total flow area, and the first total flow area is greater than or equal to the second total flow area.

[0041] In some embodiments, along the first direction, the first tab has a first length, the second tab has a second length, and the first length is equal to the second length;

[0042] Along the direction intersecting the first direction, the first tab has a first height H1, and the second tab has a second height H2;

[0043] The first height H1 and the second height H2 satisfy: H1 ≥ H2.

[0044] In some embodiments, along the first direction, the first tab has a first length, the second tab has a second length, and the first length is equal to the second length;

[0045] Along the direction intersecting the first direction, the first tab has a first height, and the second tab has a second height; the first height is equal to the second height;

[0046] The number of the first tabs is greater than the number of the second tabs.

[0047] In some embodiments, the second electrode has a second dressing area, and the first electrode has a first dressing area;

[0048] In the stacking direction, the orthographic projection of the second dressing area is inside the orthographic projection of the first dressing area;

[0049] The stacking direction is perpendicular to the first direction.

[0050] In some embodiments, the first pole piece has a second side; along the first direction, a gap between the second side and the first connecting portion closest to the second side has a first spacing L1;

[0051] Along the first direction, a gap between the second side and the second connecting portion closest to the second side has a second spacing L2;

[0052] The first distance and the second distance satisfy: L1≤L2.

[0053] In certain embodiments, the first electrode tab and / or the second electrode tab is at least one of a quadrilateral structure, a trapezoidal structure, a diamond structure, and a circular structure.

[0054] In some embodiments, the edge of the first electrode tab is a rounded structure and / or a chamfered structure;

[0055] And / or, the edge of the second electrode tab is a rounded structure or a chamfered structure.

[0056] In a second aspect, the present application provides a battery, comprising a housing, the housing being provided with a receiving cavity;

[0057] And a battery pole core, which is suitable for being arranged in a receiving cavity after being wound or stacked.

[0058] In a third aspect, the present application provides a battery pack comprising a battery.

[0059] In a fourth aspect, the present application provides an electrical device, including a battery or a battery pack.

[0060] In a battery pole core of this structure, at least one first connection portion and at least one second connection portion are completely staggered along a first direction, so as to avoid the high charge density areas of the second pole ear and the first pole ear being directly opposite each other. During rapid charging and discharging, the current density between the first pole ear and the second pole ear can be made more uniform, thereby reducing the occurrence of excessive local current density, reducing the occurrence of edge failure, and thus improving the service life of the battery.

[0061] Therefore, the battery electrode core provided in the present application can solve the problem that the charge density at the connection between the electrode tab and the electrode core is large, which causes lithium and sodium deposition in the electrode core during the cycle process, resulting in failure of the edge of the connection between the electrode tab and the electrode core, thereby reducing the service life of the battery.

[0062] In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by the battery core, battery, battery pack and electrical equipment provided by the embodiments of the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0064] Figure 1 A schematic diagram of the connection structure between the first electrode tab and the second electrode tab provided in an embodiment of the present application;

[0065] Figure 2 A second schematic diagram of the connection structure between the first electrode tab and the second electrode tab provided in an embodiment of the present application;

[0066] Figure 3 A third schematic diagram of the connection structure between the first electrode tab and the second electrode tab provided in an embodiment of the present application;

[0067] Figure 4 The fourth schematic diagram of the connection structure between the first electrode tab and the second electrode tab provided in the embodiment of the present application.

[0068] Description of reference numerals:

[0069] 100 - first electrode piece; 101 - first electrode tab; 102 - first dressing area; 103 - first connecting portion; 104 - first side edge; 105 - second side edge;

[0070] 200 - second electrode piece; 201 - second electrode tab; 202 - second dressing area; 203 - second connecting portion; 204 - third side;

[0071] L1-first distance; L2-second distance; L3-first distance; L4-second distance;

[0072] H1-first height; H2-second height;

[0073] A1-first length; A2-second length;

[0074] X - first direction. DETAILED DESCRIPTION

[0075] There is a cross-sectional change at the connection between the tab and the core. This cross-sectional change will cause the current to concentrate at the connection between the tab and the core, forming a local high charge density area.

[0076] In related technologies, the connection between the tab and the core of the positive electrode is arranged opposite the connection between the tab and the core of the negative electrode. During rapid charging and discharging, the current density at the connection between the tab and the core will increase significantly, thereby accelerating the imbalance of lithium ion insertion and extraction in the active material, leading to lithium precipitation or structural collapse. At the same time, excessive local current density can also lead to sodium precipitation. This will cause edge failure at the connection between the tab and the core, resulting in a shortened battery life.

[0077] The battery pole core provided in the embodiment of the present application has at least one first connection portion and at least one second connection portion completely staggered along the first direction, which can avoid the high charge density areas of the second pole ear and the first pole ear being directly opposite each other. During rapid charging and discharging, the current density between the first pole ear and the second pole ear can be made more uniform, thereby reducing the occurrence of excessive local current density, reducing the occurrence of edge failure, and thus improving the service life of the battery.

[0078] like Figure 1 As shown, the battery electrode core provided by the embodiment of the present application includes a first electrode piece 100 and a second electrode piece 200; wherein, the first electrode piece 100 includes a first electrode piece body and at least one first electrode ear 101, the first electrode ear 101 is connected to the first side 104 of the first electrode piece body and constitutes a first connecting portion 103, the second electrode piece includes a second electrode piece body and at least one second electrode ear 201, the second electrode ear 201 is connected to the third side 204 of the second electrode piece body and constitutes a second connecting portion 203, the second electrode piece 200 is insulated and stacked with the first electrode piece 100, and along the first direction X, at least one first connecting portion 103 and at least one second connecting portion 203 are completely staggered, and the extension direction of the first electrode ear 101 deviates from the extension direction of the second electrode ear 201.

[0079] It should be noted that the configuration shape of the first electrode tab 101 can be a quadrilateral structure, a trapezoidal structure, a diamond structure, a circular structure, or other irregular shapes, which are not limited here and can be selected according to actual use requirements.

[0080] It should be noted that the connection method between the first pole ear 101 and the first pole piece body can be: during the production process of the pole piece, a first empty foil area is usually provided on the edge of the first pole piece body, and the first pole ear 101 is formed by trimming or cutting the first empty foil area. At this time, the first pole ear 101 and the first pole piece body are integrally formed, and the first connecting portion 103 refers to the connection between the first pole ear 101 and the first empty foil area; or the paint on the first pole piece body is laser cleaned to form a clean metal surface, that is, a notch, and the first pole ear 101 and the notch on the first pole piece body are welded, that is, the first pole ear 101 and the first pole piece body are welded and fixed. At this time, the first connecting portion 103 refers to the welding point between the first pole ear 101 and the first pole piece body.

[0081] Furthermore, when the first electrode tab 101 is welded to the notch on the first electrode body, regardless of whether the notch on the first electrode body passes through the first side 104, the first electrode tab 101 extends outward relative to the first side 104, and thus the first electrode tab 101 is connected to the first side 104. In other words, any connection between the first electrode tab 101 and the first side 104 is considered to be a connection between the first electrode tab 101 and the first side 104.

[0082] It should be noted that the connection method between the second pole ear 201 and the second pole piece body can be: during the production process of the pole piece, a second empty foil area is usually provided at the edge of the second pole piece body, and the second pole ear 201 is formed by trimming or cutting the second empty foil area. At this time, the second pole ear 201 and the second pole piece body are integrally formed, and the second connecting portion 203 refers to the connection between the second pole ear 201 and the first empty foil area; or the paint on the second pole piece body is laser cleaned to form a clean metal surface, that is, a notch, and the second pole ear 201 and the notch on the second pole piece body are welded, that is, the second pole ear 201 and the second pole piece body are welded and fixed. At this time, the second connecting portion 203 refers to the welding point between the second pole ear 201 and the second pole piece body.

[0083] Furthermore, when the second pole tab 201 is welded to the notch on the second pole piece body, regardless of whether the notch on the second pole piece body passes through the third side 204, the second pole tab 201 extends outward relative to the third side 204, and thus the second pole tab 201 is connected to the third side 204. In other words, any connection between the second pole tab 201 and the third side 204 is considered to be a connection between the second pole tab 201 and the third side 204.

[0084] It should be noted that the first electrode sheet 100 is used to form one of the positive electrode sheet or the negative electrode sheet, and the second electrode sheet 200 is used to form the other of the positive electrode sheet or the negative electrode sheet.

[0085] In one embodiment, the first electrode 100 is a negative electrode, and the second electrode 200 is a positive electrode.

[0086] Furthermore, the area of ​​the positive electrode dressing region of the positive electrode sheet is smaller than the area of ​​the negative electrode dressing region of the negative electrode sheet, so that the lithium ions released by the positive electrode sheet can be completely absorbed by the negative electrode sheet.

[0087] It is understandable that the first electrode tab 101 has the above-mentioned shape, and the setting shape of the first electrode tab 101 can be changed according to the shape of the battery shell, thereby improving the adaptability of the first electrode tab 101.

[0088] It should be noted that the edge of the first electrode tab 101 may be a rounded structure, a chamfered structure, or other arc-shaped structures, which is not limited here and can be selected according to actual use requirements.

[0089] Furthermore, the edge of the first electrode tab 101 refers to the edge of the first electrode tab 101 away from the first connecting portion 103, or the edge of the first electrode tab 101 close to the first connecting portion 103. There is no limitation here and it can be selected according to actual usage requirements.

[0090] It is understood that the aforementioned structure at the edge of the first tab 101 can improve the wear resistance and aesthetics of the first tab 101. In certain embodiments, it can also reduce stress concentration at the first connecting portion 103 and prevent the side of the first tab 101 from puncturing the battery core, thereby providing safety protection for the core and extending the battery's service life.

[0091] It should be noted that the second electrode tab 201 may be in a quadrilateral structure, a trapezoidal structure, a diamond structure, a circular structure, or other irregular shapes, which are not limited here and can be selected according to actual use requirements.

[0092] It is understandable that the second pole tab 201 has the above-mentioned shape, and the setting shape of the second pole tab 201 can be changed according to the shape of the battery shell, thereby improving the adaptability of the second pole tab 201.

[0093] It should be noted that the edge of the second electrode tab 201 may be a rounded structure, a chamfered structure, or other arc-shaped structures, which is not limited here and can be selected according to actual use requirements.

[0094] Furthermore, the edge of the second electrode tab 201 refers to the edge of the second electrode tab 201 away from the second connecting portion 203, or the edge of the second electrode tab 201 close to the second connecting portion 203. There is no limitation here and it can be selected according to actual use requirements.

[0095] It is understood that the aforementioned structure at the edge of the second tab 201 can improve the wear resistance and aesthetics of the second tab 201. In certain embodiments, it can also reduce stress concentration at the second connecting portion 203 and prevent the side of the second tab 201 from puncturing the battery core, thereby providing safety protection for the core and extending the battery's service life.

[0096] The first pole piece 100 provided in the embodiment of the present application has a plurality of first pole tabs 101, and a plurality of first connecting portions 103 are arranged at intervals along the first direction X. The second pole piece 200 has a plurality of second pole tabs 201, and a plurality of second connecting portions 203 are arranged at intervals along the first direction X. In the first direction X, the plurality of first connecting portions 103 and the plurality of second connecting portions 203 are completely staggered.

[0097] It is understandable that increasing the number of first tabs 101 and second tabs 201 can increase the flow conduction area of ​​the battery core, thereby improving the fast charging performance of the battery core. It can also increase the heat dissipation area of ​​the battery core, thereby optimizing the heat generation of the battery core.

[0098] like Figure 2 As shown, the multiple first electrode tabs 101 provided in the embodiment of the present application have a first total flow area, and the multiple second electrode tabs 201 have a second total flow area, and the first total flow area is greater than or equal to the second total flow area.

[0099] It is understood that when the first total flow area is greater than the second total flow area, the flow capacity of the first electrode tab 101 can be greater than the flow capacity of the second electrode tab 201, thereby improving the performance of the electrode core; and the heat generation of the first electrode tab 101 can be reduced, thereby reducing the heat generation of the electrode core, thereby improving the performance of the battery. When the first total flow area is equal to the second total flow area, the heat generation of the electrode core can be more uniform.

[0100] It should be noted that the first total flow area is the flow area of ​​one first electrode tab 101 , or may be the sum of the flow areas of multiple first electrode tabs 101 . There is no limitation here and it can be selected according to actual use requirements.

[0101] It should be noted that the second total flow area is the flow area of ​​one second electrode tab 201 , or may be the sum of the flow areas of multiple second electrode tabs 201 . There is no limitation here and it can be selected according to actual use requirements.

[0102] In one embodiment, the battery pole core provided by the embodiment of the present application has a first pole tab 101 having a first length along a first direction X, a second pole tab 201 having a second length, and the first length is equal to the second length; along the intersection with the first direction X, the first pole tab 101 has a first height H1; along the intersection with the first direction X, the second pole tab 201 has a second height H2, and the first height H1 and the second height H2 satisfy: H1 ≥ H2.

[0103] It should be noted that the first height is: the distance between the connection between the first pole ear 101 and the first pole piece body and the outermost side of the first pole ear 101 along the first direction X; the second height is: the distance between the connection between the second pole ear 201 and the second pole piece body and the outermost side of the second pole ear 201 along the first direction X.

[0104] It should be noted that the angle between the first direction X and the angle intersecting the first direction X can be any value between 0 degrees and 180 degrees, which is not limited here and can be selected according to actual use requirements.

[0105] It is understandable that the first height H1 and the second height H2 satisfy: H1 ≥ H2, so that after the first pole piece 100 and the second pole piece 200 are flattened and welded, the current carrying capacity of the first pole tab 101 is greater than or equal to the second pole tab 201.

[0106] like Figure 3 As shown, in one embodiment, along the first direction X, the first pole tab 101 has a first length, the second pole tab 201 has a second length, and the first length is equal to the second length; along the direction intersecting the first direction X, the first pole tab 101 has a first height, the second pole tab 201 has a second height, and the first height is equal to the second height; the number of the first pole tabs 101 is greater than the number of the second pole tabs 201.

[0107] It can be understood that the use of the above-mentioned structure in the battery pole core can make the sum of the first total flow area greater than the sum of the second total flow area, so as to improve the performance of the pole core; and can reduce the heat generation of the first pole ear 101, thereby reducing the heat generation of the pole core, so as to improve the performance of the battery.

[0108] In the battery pole core provided by the embodiment of the present application, the first pole piece includes multiple first pole ears 101, and a second connection portion 203 is provided between at least partially adjacent two first connection portions 103 along the first direction X; along the first direction X, the gap between the two adjacent first connection portions 103 has a first distance L3; along the first direction X, the second connection portion 203 has a first length A1.

[0109] It should be noted that there are various different relationships between the first distance L3 and the first length A1. The relationship between the first distance L3 and the first length A1 will be described below with examples.

[0110] In a feasible implementation manner, the first distance L3 and the first length A1 satisfy: L3 ≥ A1.

[0111] It can be understood that the first distance L3 and the first length A1 satisfy: L3≥A1, so that after the second pole piece 200 and the first pole piece 100 are wound, they can avoid the high charge density areas of the second connection part 203 and the first connection part 103 facing each other, thereby reducing the risk of edge failure.

[0112] In another feasible embodiment, a second connection portion 203 is provided in the gap between two adjacent first connection portions 103, and in the first direction X, the second connection portion 203 and the two adjacent first connection portions 103 are completely staggered, and the first distance L3 and the first length A1 satisfy: L3 = n*A1; wherein n ≥ 1, and n is an integer.

[0113] It should be noted that the first distance L3 and the first length A1 satisfy: L3 = n*A1, so that after the second pole piece 200 and the first pole piece 100 are wound, they can avoid the high charge density areas of the second connection part 203 and the first connection part 103 facing each other, so as to reduce the risk of edge failure, thereby improving the performance of the pole core and extending the service life of the battery.

[0114] It is understandable that the specific relationship between the first distance L3 and the first length A1 is not limited and can be selected according to actual usage requirements.

[0115] It should be noted that the value of n can be any integer greater than or equal to 1, and there is no restriction here. It can be selected according to actual usage requirements.

[0116] It is understandable that the value of n can be any of the above values, so that the gap between adjacent first connection parts 103 can accommodate at least one second connection part 203, so that the first connection parts 103 and the second connection parts 203 are completely staggered.

[0117] It should be noted that, in one embodiment, the first distance L3 and the first length A1 satisfy: L3=3*A1, and along the first direction, the gap distances between the second connection portion 203 and the two adjacent first connection portions 103 are equal.

[0118] It can be understood that along the first direction, the distance of the gap between the second connecting portion 203 and the two adjacent first connecting portions 103 is equal, so that one second connecting portion 203 can be located between two adjacent first connecting portions 103, which can improve the setting accuracy of the second connecting portion 203; thereby, after the first pole piece 100 and the second pole piece 200 are wound, they can avoid the high charge density areas of the first connecting portion 103 and the second connecting portion 203 facing each other, so as to reduce the risk of edge failure, thereby improving the performance of the pole core and extending the service life of the battery.

[0119] It should be noted that the distance between the second connection portion 203 and the two adjacent first connection portions 103 along the first direction can be obtained by measuring the distance between the second connection portion 203 and the first connection portions 103 closest to the left and right sides along the first direction.

[0120] It should be noted that errors within the normal measurement range are also within the protection scope of the present invention.

[0121] Furthermore, the error range can be plus or minus 1 mm.

[0122] The second pole piece 200 provided in the embodiment of the present application includes multiple second pole ears 201. Along the first direction X, the gap length between two adjacent first connecting parts 103 is equal to the length of the second connecting part 203. The second connecting part 203 is arranged between the two first connecting parts 103 so that the multiple first connecting parts 103 and the multiple second connecting parts 203 are alternately staggered.

[0123] It can be understood that the above structure can avoid the high charge density areas of the second connecting part 203 and the first connecting part 103 being directly opposite to each other, so as to reduce the risk of edge failure, thereby improving the performance of the electrode core and extending the service life of the battery.

[0124] It should be noted that the embodiment of the present application provides a plurality of second pole tabs 201, and the plurality of second pole tabs 201 are arranged at intervals along the first direction X. Along the first direction X, at least one first connection portion 103 is provided in the gap between at least partially adjacent two second connection portions 203, and along the first direction X, the gap between two adjacent second connection portions 203 has a second distance L4; along the first direction X, the first connection portion 103 has a second length A2, and the second distance L4 and the second length A2 satisfy: L4 ≥ A2.

[0125] It can be understood that providing multiple second pole ears 201 can increase the current conduction area of ​​the pole core, thereby improving the performance of the battery; and can increase the heat dissipation area to accelerate the surface heat dissipation speed of the second pole piece 200, thereby reducing the surface temperature of the battery; the second distance L4 and the second length A2 satisfy: L4 ≥ A2, so that the second pole piece 200 and the first pole piece 100 can avoid the high charge density areas of the second connection part 203 and the first connection part 103 facing each other after winding, thereby reducing the risk of edge failure.

[0126] It should be noted that, along the first direction X, a first connection portion 103 is provided in the gap between at least partially two adjacent second connection portions 203, and in the first direction X, the first connection portion 103 and the two adjacent second connection portions 203 are completely staggered; the second distance L4 and the second length A2 satisfy: L4 = m*A2, where m≥1, and m is an integer.

[0127] It can be understood that the battery electrode core of this structure can avoid the high charge density areas of the second connecting part 203 and the first connecting part 103 facing each other after the second electrode plate 200 and the first electrode plate 100 are wound, so as to reduce the risk of edge failure, thereby improving the performance of the electrode core and extending the service life of the battery.

[0128] It should be noted that the value of m can be any integer greater than or equal to 1, and there is no restriction here. It can be selected according to actual usage requirements.

[0129] It is understandable that the value of m can be any of the above values, so that the gap between adjacent second connecting parts 203 can accommodate at least one first connecting part 103, so that the first electrode tab 101 and the second electrode tab 201 are completely staggered.

[0130] Furthermore, along the first direction X, the gaps between the first connection portion 103 and the two adjacent second connection portions 203 are equal.

[0131] It is understood that along the first direction X, the gaps between the first connecting portion 103 and the two adjacent second connecting portions 203 are equal, which can improve the processing accuracy of the first connecting portion 103 and the second connecting portion 203, and improve the aesthetics of the first pole tab 101 and the second pole tab 201. Furthermore, after the second pole piece 200 and the first pole piece 100 are wound, they can avoid the high charge density areas of the second connecting portion 203 and the first connecting portion 103 being directly aligned, thereby reducing the risk of edge failure, thereby improving the performance of the pole core and extending the service life of the battery.

[0132] like Figure 4As shown, the first pole piece 100 is provided with a plurality of first pole tabs 101 , which are spaced apart along the first direction X. Along the first direction X, two first connection portions 103 are provided in the gap between at least partially adjacent two second connection portions 203 .

[0133] It can be understood that by increasing the number of first pole tabs 101, the current conduction area of ​​the pole core can be increased, thereby improving the performance of the battery; and the heat dissipation area of ​​the first pole tab 101 can be increased to accelerate the surface heat dissipation speed of the first pole piece 100, thereby reducing the surface temperature of the battery.

[0134] Furthermore, along the first direction X, the two first connection parts 103 and the two adjacent second connection parts 203 are completely staggered, and along the first direction X, the gap distances between the two first connection parts 103 and the second connection parts 203 adjacent thereto are equal, and the gap distance between the second connection part 203 and the first connection part 103 adjacent thereto is equal to the gap distance between the two first connection parts 103.

[0135] It is understood that the above structure can completely stagger the two first connecting portions 103 and the two adjacent second connecting portions 203, thereby improving the processing accuracy of the first connecting portions 103 and the second connecting portions 203 and improving the aesthetics of the first and second pole tabs 101 and 201. Furthermore, after winding, the second pole piece 200 and the first pole piece 100 can avoid the high charge density areas of the second connecting portions 203 and the first connecting portions 103 being directly aligned, thereby reducing the risk of edge failure, thereby improving the performance of the pole core and extending the service life of the battery.

[0136] It should be noted that the second electrode 200 has a second dressing area 202, and the first electrode 100 has a first dressing area 102; in the stacking direction, the orthographic projection of the second dressing area 202 is inside the orthographic projection of the first dressing area 102, and the stacking direction is set perpendicular to the first direction X.

[0137] It should be noted that a diaphragm is provided between the second pole piece 200 and the first pole piece 100. The diaphragm is used to insulate and connect the second pole piece 200 and the first pole piece 100 to reduce the occurrence of a short circuit in the pole core caused by direct connection between the second pole piece 200 and the first pole piece 100, thereby protecting the battery safety.

[0138] In certain embodiments, when the first electrode sheet 100 is a negative electrode sheet and the second electrode sheet 200 is a positive electrode sheet, the orthographic projection of the second dressing area 202 along the stacking direction is within the orthographic projection of the first dressing area 102. This allows lithium ions released from the positive electrode sheet to be better absorbed by the negative electrode sheet. This also reduces the risk of failure at the negative electrode entry and tail ends of the wound battery, and reduces the risk of failure at the negative electrode edge of the wound battery, thereby extending the battery's service life.

[0139] It should be noted that the first pole piece 100 has a second side 105; along the first direction X, the gap between the second side 105 and the first connecting portion 103 closest to the second side 105 has a first spacing L1; along the first direction X, the gap between the second side 105 and the second connecting portion 203 closest to the second side 105 has a second spacing L2; the first spacing and the second spacing satisfy: L1≤L2.

[0140] It should be noted that the first side 104 and the second side 105 are arranged to intersect.

[0141] It is understood that in some embodiments, the second electrode sheet 200 and the first electrode sheet 100 are wound along the first direction X. In this case, the second electrode sheet 200 is located inside the first electrode sheet 100. This arrangement can increase the capacity of the battery. In some embodiments, when the first electrode sheet 100 forms the negative electrode sheet and the second electrode sheet 200 forms the positive electrode sheet, the above structure can also enable the lithium ions released by the positive electrode sheet to be better absorbed by the negative electrode sheet.

[0142] It should be noted that there are various corresponding relationships between the first spacing L1 and the second spacing L2. The relationship between the first spacing L1 and the second spacing is described below with examples.

[0143] In a feasible embodiment, the first distance L1 and the second distance L2 satisfy the following: L1 < L2.

[0144] It can be understood that in the battery core of this structure, L1<L2, the lithium ions released by the positive electrode sheet can be better absorbed by the negative electrode sheet.

[0145] In another possible embodiment, the first distance L1 and the second distance L2 satisfy the following: L1 = L2.

[0146] It can be understood that in the battery core of this structure, L1=L2, the lithium ions released by the positive electrode sheet can be better absorbed by the negative electrode sheet.

[0147] It is understandable that the corresponding relationship between the first spacing L1 and the second spacing L2 is not limited and can be selected according to actual use requirements. It only needs to ensure that the first spacing and the second spacing satisfy: L1≤L2.

[0148] An embodiment of the present application provides a battery, comprising a shell having a receiving cavity, and a battery core provided by any of the above embodiments, wherein the battery core is wound or stacked in the receiving cavity.

[0149] It should be noted that the battery can be a cylindrical battery, a wound or laminated soft-pack battery, a square aluminum shell battery, or a steel shell battery. In addition, the battery can be a lithium-ion battery or a sodium-ion battery.

[0150] Since the battery in this embodiment includes the battery core described in any of the above embodiments, the battery device includes the battery core structure and beneficial effects, which will not be further described in this embodiment.

[0151] An embodiment of the present application provides a battery pack, comprising the battery provided in the above embodiment.

[0152] An embodiment of the present application also provides an electrical device, comprising the battery or battery pack described in any of the above embodiments.

[0153] It should be noted that the electrical equipment includes electrical devices, and batteries or battery packs are used to provide electrical energy to the electrical devices.

[0154] The electrical equipment in the embodiments of the present application may be a vehicle. For example, the vehicle may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Accordingly, the electrical device may be the vehicle's drive mechanism or the vehicle's control system.

[0155] In addition, the electrical equipment may also be other energy storage devices, such as mobile phones, portable devices, laptop computers, electric toys, electric tools, ships and spacecraft, etc., among which the spacecraft may include airplanes, rockets, space shuttles or spacecraft.

[0156] Since the electrical device in this embodiment includes the battery or battery pack described in any of the above embodiments, the structure and beneficial effects of the battery or battery pack included in the electrical device will not be further elaborated in this embodiment.

[0157] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0158] It should be noted that references in this specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," and the like indicate that the described embodiment may include a particular feature, structure, or characteristic, but not necessarily every embodiment includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0159] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery core, characterized in that: include: A first pole piece (100), the first pole piece (100) comprising a first pole piece body and at least one first pole lug (101), the first pole lug (101) being connected to a first side edge of the first pole piece body and forming a first connecting portion (103); A second pole piece (200), the second pole piece (200) comprising a second pole piece body and at least one second pole lug (201), the second pole lug (201) being connected to a third side of the second pole piece body and forming a second connecting portion (203); The second pole piece (200) and the first pole piece (100) are insulated and stacked; Along the first direction, at least one of the first connecting portions (103) and at least one of the second connecting portions (203) are completely staggered; The extension direction of the first pole tab (101) deviates from the extension direction of the second pole tab (201).

2. A battery core according to claim 1, characterized in that: The first pole piece (100) has a plurality of first pole tabs (101), and a plurality of first connecting portions (103) are arranged at intervals along the first direction; the second pole piece (200) has a plurality of second pole tabs (201), and a plurality of second connecting portions (203) are arranged at intervals along the first direction; In the first direction, the plurality of first connection portions (103) and the plurality of second connection portions (203) are completely staggered.

3. The battery core according to claim 1, characterized in that: The first pole piece includes a plurality of first pole tabs (101), Along the first direction, a second connecting portion (203) is provided in the gap between at least partially adjacent two first connecting portions (103); Along the first direction, the gap between the two adjacent first connecting portions (103) has a first distance L3; Along the first direction, the second connecting portion (203) has a first length A1; The first distance L3 and the first length A1 satisfy: L3≥A1.

4. A battery core according to claim 3, characterized in that: A second connecting portion (203) is provided in the gap between two adjacent first connecting portions (103), and in the first direction, the second connecting portion (203) and the two adjacent first connecting portions (103) are completely staggered, and the first distance L3 and the first length A1 satisfy the following: L3=n*A1; Wherein, n≥1, and n is an integer.

5. The battery core according to claim 4, characterized in that: The first distance L3 and the first length A1 satisfy: L3=3*A1; Along the first direction, the gap distances between the second connecting portion (203) and the two adjacent first connecting portions (103) are equal.

6. The battery core according to claim 3, characterized in that: The second pole piece (200) comprises a plurality of second pole tabs (201); along the first direction, the gap length between two adjacent first connecting portions (103) is equal to the length of the second connecting portion (203); the second connecting portion (203) is arranged between the two first connecting portions (103), so that the plurality of first connecting portions (103) and the plurality of second connecting portions (203) are alternately staggered.

7. The battery core according to claim 1, characterized in that: A plurality of the second pole tabs (201) are provided, and the plurality of the second pole tabs (201) are spaced apart along the first direction; At least one first connection portion (103) is provided in a gap between at least partially adjacent two second connection portions (203) along the first direction, and the gap between the adjacent two second connection portions (203) along the first direction has a second distance L4; Along the first direction, the first connecting portion (103) has a second length A2; The second distance L4 and the second length A2 satisfy: L4≥A2.

8. The battery core according to claim 7, characterized in that: Along the first direction, one of the first connecting portions (103) is provided in a gap between at least two adjacent second connecting portions (203), and in the first direction, the first connecting portion (103) and the two adjacent second connecting portions (203) are completely staggered; The second distance L4 and the second length A2 satisfy: L4=m*A2; Wherein, m≥1, m is an integer.

9. The battery core according to claim 8, characterized in that: Along the first direction, the gap distances between the first connecting portion (103) and the two second connecting portions (203) adjacent thereto are equal.

10. The battery core according to claim 7, characterized in that: The first pole piece (100) is provided with a plurality of first pole tabs (101), the plurality of first pole tabs (101) being arranged at intervals along a first direction, and two first connecting portions (103) being provided in a gap between at least partially adjacent two second connecting portions (203) along the first direction.

11. The battery core according to claim 10, characterized in that: Along the first direction, two of the first connecting portions (103) and two adjacent second connecting portions (203) are completely staggered; Along the first direction, the gap distances between the two first connecting portions (103) and the second connecting portion (203) adjacent thereto are equal, and the gap distance between the second connecting portion (203) and the first connecting portion (103) adjacent thereto is equal to the gap distance between the two first connecting portions (103).

12. A battery core according to any one of claims 1 to 11, characterized in that: There are multiple first pole tabs (101), and there are multiple second pole tabs (201). The multiple first pole tabs (101) have a first total flow area, and the multiple second pole tabs (201) have a second total flow area. The first total flow area is greater than or equal to the second total flow area.

13. The battery core according to claim 12, characterized in that: Along the first direction, the first pole tab (101) has a first length, the second pole tab (201) has a second length, and the first length is equal to the second length; Along the first direction intersecting the first pole tab (101), the first pole tab (101) has a first height H1, and the second pole tab (201) has a second height H2; The first height H1 and the second height H2 satisfy: H1 ≥ H2.

14. The battery core according to claim 12, characterized in that: Along the first direction, the first pole tab (101) has a first length, the second pole tab (201) has a second length, and the first length is equal to the second length; Along the first direction intersecting the first pole tab (101), the first pole tab (101) has a first height, and the second pole tab (201) has a second height; the first height is equal to the second height; The number of the first pole tabs (101) is greater than the number of the second pole tabs (201).

15. A battery core according to any one of claims 1 to 11, characterized in that: The second electrode (200) has a second dressing area (202), and the first electrode (100) has a first dressing area (102); In the stacking direction, the orthographic projection of the second dressing area (202) is inside the orthographic projection of the first dressing area (102); The stacking direction is arranged perpendicular to the first direction.

16. The battery core according to claim 15, characterized in that: The first pole piece has a second side (105); along the first direction, a gap between the second side (105) and the first connecting portion (103) closest to the second side (105) has a first spacing L1; Along the first direction, the gap between the second side edge (105) and the second connecting portion (203) closest to the second side edge (105) has a second spacing L2; The first distance and the second distance satisfy: L1≤L2.

17. A battery core according to any one of claims 1 to 11, characterized in that: The first pole tab (101) and / or the second pole tab (201) is at least one of a quadrilateral structure, a trapezoidal structure, a diamond structure, and a circular structure.

18. A battery core according to any one of claims 1 to 11, characterized in that: The edge of the first tab (101) is a rounded structure and / or a chamfered structure; And / or, the edge of the second electrode tab (201) is a rounded structure or a chamfered structure.

19. A battery, characterized in that: It comprises a shell, wherein the shell is provided with a receiving cavity; And a battery pole core according to any one of claims 1-18, wherein the battery pole core is suitable for being arranged in the accommodating cavity after being wound or stacked.

20. A battery pack, characterized in that: A battery comprising the battery of claim 19.

21. An electrical device, characterized in that: Including a battery as claimed in claim 19, or a battery pack as claimed in claim 20.

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