Electrode sheet, electrode core, battery, battery apparatus and electrical device

Abstract

An electrical device, the electrical device comprising a battery or a battery apparatus, the battery apparatus comprising a battery, the battery comprising an electrode core, and the electrode core comprising an electrode sheet. The electrode sheet comprises a tab and an electrode sheet body, the tab being connected to one end of the electrode sheet body in the length direction; in the length direction, the electrode sheet body has a plurality of regions arranged in sequence; the areas of the regions are the same, and each of the regions is provided with a through hole; in the length direction, the ratio of the total area of the through hole in each of the regions to the total area of the corresponding region is an open area ratio, denoted as A. The region closest to the tab is set as a first region, and the open area ratio of the first region is denoted as A1; the region adjacent to the first region is set as a second region, and the open area ratio of the second region is denoted as A2; likewise, the open area ratio of an n-th region is denoted as An, where A(n-1)≤An, and at least one A(n-1)<An.

Description

Pole piece, pole core, battery, battery device and electric equipment

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202421519517.7, filed on June 28, 2024, and entitled "A pole piece, pole core, battery, battery device and electric equipment", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a pole piece, pole core, battery, battery device and electric equipment. BACKGROUND

[0004] Lithium batteries are widely used in energy storage devices, mobile power sources and automotive fields. A lithium battery is composed of multiple single cells, the energy density of the single cell determines the energy density of the lithium battery, and the single cell is formed by winding or stacking pole pieces. In order to enable the pole piece to effectively absorb and store electrolyte, and to shorten the diffusion path of lithium ions, it is often necessary to punch holes in the pole piece during the preparation of the pole piece. The structure of a lithium ion battery includes positive and negative pole pieces, a separator, electrolyte and a shell, and when the battery is charging and discharging, the reaction of active materials, battery polarization and battery internal resistance will all generate heat. When the temperature of the lithium battery is 70-80℃, the heat generated by the battery is mainly reaction heat, and when the temperature is lower than this, the Joule heat generated by the battery internal resistance accounts for a large proportion. The working temperature of a general lithium battery is below 70℃, so the heat generated by the battery is mainly formed by internal resistance.

[0005] Compared with general pole pieces, the punched pole piece can improve the adhesion capacity of the active material, can adjust the mass distribution of the pole piece, and can prolong the cycle life of the battery. However, when the battery generates heat, the position with the highest temperature affects the rate performance and the applicable ambient temperature of the battery, and the ordinary punched pole piece does not solve the problem of uneven heating of the pole piece, i.e., the mass distribution of the pole piece is not reasonable enough, which is not conducive to improving the fast charging performance of the battery and prolonging the cycle life of the battery. In view of this, we propose a pole piece, pole core, battery, battery device and electric equipment.

[0006] DISCLOSURE

[0007] The purpose of the present application is to provide a pole piece, pole core, battery and electric equipment. By providing a pole piece that punches holes in the length direction of the regions distributed in sequence, the temperature distribution of the pole piece during operation can be more uniform, the weight of the pole piece can be reduced, the specific capacity of the battery quality can be improved, the fast charging performance of the battery can be improved, and the cycle life of the battery can be prolonged.

[0008] To achieve this purpose, the present application adopts the following technical solutions:

[0009] The application provides a pole piece, which comprises a pole tab and a pole piece body, the pole tab is connected to one end of the pole piece body along a length direction, the pole piece body is provided with a plurality of regions arranged in sequence along the length direction, the area of each region is the same, and each region is provided with a through hole; along the length direction, the ratio of the total area of the through holes in each region to the total area of the corresponding region is a porosity, denoted as A, the region closest to the pole tab is the first region, the porosity of the first region is denoted as A1, the region adjacent to the first region is the second region, the porosity of the second region is denoted as A2, and the porosity of the nth region is denoted as An, A(n-1)≤An and there is at least one A(n-1)<An.

[0010] Optionally, 10%≤A≤80%.

[0011] Optionally, the pole piece body is provided with nine regions along the length direction.

[0012] Further, the porosity of each region is A1=A2=A3=A4=A5=A6=10%, A7=A8=20%, A9=40% and / or the porosity of each region is A1=A2=A3=A4=10%, A5=A6=A7=A8=20%, A8=30%, A9=50%.

[0013] Optionally, the porosity of each region increases in sequence along the length direction.

[0014] Optionally, the plurality of through holes are regularly arranged or irregularly arranged.

[0015] Optionally, each region is provided with a plurality of through holes, and the plurality of through holes have the same aperture.

[0016] Optionally, the shapes of the plurality of through holes are circular and / or polygonal respectively.

[0017] A pole core comprises the pole piece.

[0018] A battery comprises the pole core.

[0019] A battery device comprises the battery.

[0020] A power consumption device comprises the battery or the battery device.

[0021] The purpose of the present application is to provide a pole piece, a pole core, a battery and an electrical equipment. By providing a pole piece with regions sequentially distributed and perforated in the length direction, the temperature distribution of the pole piece during operation can be more uniform, the weight of the pole piece can be reduced, the specific capacity of the battery quality can be improved, the fast charging performance of the battery can be improved, and the battery life can be prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0022] The following drawings for the embodiments of the present application are hereby incorporated into the present application as part of the present application for the purpose of understanding the present application. The embodiments of the present application and the description thereof shown in the drawings are used to explain the principles of the present application.

[0023] FIG. 1 is a schematic diagram of the overall structure of a pole piece with multiple regions perforated according to an embodiment of the present application;

[0024] FIG. 2 is a schematic diagram of temperature distribution simulation of a general pole piece;

[0025] FIG. 3 is a schematic diagram of temperature distribution simulation of a general perforated pole piece;

[0026] FIG. 4 is a schematic diagram of temperature distribution simulation of a pole piece with regions perforated in the length direction according to an embodiment of the present application;

[0027] FIG. 5 is a table of positive pole piece perforation rate and simulation temperature difference results according to an embodiment of the present application;

[0028] FIG. 6 is a table of negative pole piece perforation rate and simulation temperature difference results according to an embodiment of the present application;

[0029] FIG. 7 is a schematic diagram of a regionally perforated positive pole piece according to an embodiment of the present application;

[0030] FIG. 8 is a schematic diagram of a regionally perforated negative pole piece according to an embodiment of the present application;

[0031] FIG. 9 is a schematic block diagram of a pole core according to an embodiment of the present application;

[0032] FIG. 10 is a schematic block diagram of a battery according to an embodiment of the present application;

[0033] FIG. 11 is a schematic block diagram of a battery device according to an embodiment of the present application;

[0034] FIG. 12 is a schematic block diagram of an electrical equipment according to an embodiment of the present application;

[0035] FIG. 13 is another schematic block diagram of an electrical equipment according to an embodiment of the present application;

[0036] Reference signs: pole core 100, battery 200, battery device 300, electrical equipment 400; pole piece 1, pole lug 11, pole piece body 12, through hole 2, region 3, first region 31, second region 32. DETAILED DESCRIPTION

[0037] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to unnecessarily obscure the present application.

[0038] The present application will be further described by examples with reference to the drawings. It is to be understood that the following examples are illustrative of specific embodiments of the application and are not intended to limit the scope of the application. In addition, it is to be understood that the drawings are only schematic and that, therefore, specific features can have not been depicted to the scale.

[0039] In the description of the present embodiments, the term "length direction" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or structure referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In order to make the temperature distribution of the pole piece more uniform during operation, without significantly increasing the battery charge and discharge temperature rise, while retaining the advantages of the punched pole piece, reducing the weight of the pole piece, improving the specific capacity of the battery quality, improving the fast charging performance of the battery and prolonging the service life of the battery, the present embodiment provides a pole piece, a battery cell, a battery and an electrical equipment.

[0041] As shown in FIG. 1, the pole piece 1 includes a pole tab 11 and a pole piece body 12, and a plurality of regions 3 are arranged in sequence along the length direction of the pole piece 1, the region 3 is completely located in the pole tab 11, the pole tab 11 is connected to one end of the pole piece body 12 along the length direction, and the length direction is from the pole tab 11 to the pole piece body 12. Each region 3 is provided with a through hole 2, and the through hole 2 is arranged in the region 3, that is, the through hole 2 is arranged in the pole piece body 12, and the pole tab 11 is not provided with the through hole 2. The areas of the regions 3 are the same, the shapes of the regions 3 are the same, the regions 3 are sequentially distributed along the length direction of the pole piece 1, that is, arranged in sequence from the pole tab 11 to the pole piece body 12. Along the length direction of the pole piece 1, the ratio of the total area of the through holes 2 in each region 3 to the total area of the corresponding region 3 is the opening rate, denoted as A, the region 3 closest to the pole tab 11 is set as the first region 31, the opening rate of the first region 31 is denoted as A1, the region 3 adjacent to the first region 31 is set as the second region 32, the opening rate of the second region 32 is denoted as A2, and the opening rate of the nth region 3 is denoted as An, and the characteristic is that A(n-1)≤An and at least one A(n-1)<An, that is, from the pole tab 11 along the length direction, the farther the region 3 is from the pole tab 11, the higher the opening rate is, that is, the farther the region 3 is from the pole tab 11, the larger the area of the through holes 2 in the region 3 is, and at least one region 3 has an opening rate An greater than the opening rate A(n-1) of another adjacent region 3 closer to the pole tab 11.

[0042] Optionally, 10%≤A≤80% is provided, that is, when the opening rate of the region 3 in the set region 3 of the pole tab body 12 is between 10% and 80%, that is, the ratio of the punched area to the area of the region 3 is between 10% and 80%, the heat dissipation effect of the pole piece 1 during work is better, and the temperature distribution of the pole piece 1 is more uniform.

[0043] The calculation method of the opening rate of a certain region 3 is that the pole piece body 12 is evenly divided into a plurality of regions 3 along the length direction, the total area of each region 3 is equal, denoted as S1, one or more through holes 2 are arranged in each region 3, and the total area of the one or more through holes 2 is denoted as S2, and the opening rate A of each region 3 is the ratio of the total area S1 of the region 3 to the total area S2 of all the through holes 2 in the region 3, that is, A=S2 / S1.

[0044] As can be seen from FIG. 2, FIG. 3 and FIG. 4, that is, as can be seen from the temperature simulation diagram of the general pole piece and the temperature distribution simulation diagram of the general open hole pole piece, the general pole piece is a pole piece without through holes 2 on the pole piece body 12, and the general open hole pole piece has no limitation on the total area and position of the open holes. The color of the temperature in the temperature distribution simulation diagram of the general open hole pole piece is more uniform than that in the temperature simulation diagram of the general pole piece in the working state, and the color distribution of the temperature in the temperature distribution simulation diagram of the length direction regional open hole pole piece is more uniform than that in the temperature distribution simulation diagram of the general open hole pole piece, that is, the temperature distribution of the general open hole pole piece in the working state is more uniform than that of the general pole piece, and the temperature distribution of the length direction regional open hole pole piece is more uniform than that of the general open hole pole piece in the working state.

[0045] In the present embodiment, 9 regions 3 are provided along the length direction of the pole piece 1, that is, the positive pole piece and the negative pole piece are divided into 9 regions 3 along the length direction thereof, the area of each region 3 is equal, and the regions 3 are sequentially distributed along the length direction, and are respectively denoted as A1, A2, A3, A4, A5, A6, A7, A8 and A9.

[0046] As shown in FIG. 5, temperature difference measurement is performed on the sub-region positive plate with different combinations of opening rates. Among them, the first group of opening rates of the positive plate is set as: A1=0%, A2=0%, A3=0%, A4=0%, A5=0%, A6=10%, A7=0%, A8=0%, A9=0%, and the experimental calculation result is: the highest temperature is 40.58℃, the lowest temperature is 37.528℃, and the temperature difference is 3.052℃. The second group of opening rates of the positive plate is set as: A1=5%, A2=5%, A3=5%, A4=5%, A5=5%, A6=5%, A7=5%, A8=5%, A9=5%, and the experimental calculation result is: the highest temperature is 44.258℃, the lowest temperature is 37.365℃, and the temperature difference is 6.893℃. The third group of opening rates of the positive plate is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=10%, A7=10%, A8=10%, A9=10%, and the experimental calculation result is: the highest temperature is 42.249℃, the lowest temperature is 39.363℃, and the temperature difference is 2.886℃. The fourth group of opening rates of the positive plate is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=10%, A7=10%, A8=10%, A9=20%, and the experimental calculation result is: the highest temperature is 42.32℃, the lowest temperature is 39.727℃, and the temperature difference is 2.593℃. The fifth group of opening rates of the positive plate is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=10%, A7=10%, A8=20%, A9=20%, and the experimental calculation result is: the highest temperature is 42.408℃, the lowest temperature is 39.995℃, and the temperature difference is 2.413℃. The sixth group of opening rates of the positive plate is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=10%, A7=20%, A8=20%, A9=20%, and the experimental calculation result is: the highest temperature is 42.522℃, the lowest temperature is 40.19℃, and the temperature difference is 2.332℃. The seventh group of opening rates of the positive plate is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=20%, A7=20%, A8=20%, A9=20%, and the experimental calculation result is: the highest temperature is 42.799℃, the lowest temperature is 40.798℃, and the temperature difference is 2.001℃. The eighth group of opening rates of the positive plate is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=20%, A7=20%, A8=20%, A9=30%, and the experimental calculation result is: the highest temperature is 42.482℃, the lowest temperature is 40.605℃, and the temperature difference is 1.877℃.The ninth group of positive electrode plate opening ratio is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=10%, A7=20%, A8=20%, A9=30%, and the experimental calculation result is: the highest temperature is 42.985℃, the lowest temperature is 41.428℃, and the temperature difference is 1.53℃. The tenth group of positive electrode plate opening ratio is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=10%, A7=20%, A8=20%, A9=40%, and the experimental calculation result is: the highest temperature is 42.579℃, the lowest temperature is 41.16℃, and the temperature difference is 1.419℃. The eleventh group of positive electrode plate opening ratio is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=20%, A6=20%, A7=20%, A8=30%, A9=50%, and the experimental calculation result is: the highest temperature is 42.221℃, the lowest temperature is 40.08℃, and the temperature difference is 2.141℃. The twelfth group of positive electrode plate opening ratio is set as: A1=80%, A2=80%, A3=80%, A4=80%, A5=80%, A6=80%, A7=80%, A8=80%, A9=80%, and the experimental calculation result is: the highest temperature is 146.05℃, the lowest temperature is 73.681℃, and the temperature difference is 72.369℃. The thirteenth group of positive electrode plate opening ratio is set as: A1=90%, A2=90%, A3=90%, A4=90%, A5=90%, A6=90%, A7=90%, A8=90%, A9=90%, and the experimental calculation result is: the highest temperature is 300.67℃, the lowest temperature is 102.5℃, and the temperature difference is 198.17℃.

[0047] As shown in FIG. 6, temperature difference measurement is performed on the sub-region negative pole piece with different combinations of opening rates. Among them, the first group of opening rates of the negative pole piece is set as: A1=0%, A2=0%, A3=0%, A4=0%, A5=0%, A6=10%, A7=0%, A8=0%, A9=0%, and the experimental calculation result is: the highest temperature is 43.131℃, the lowest temperature is 36.746℃, and the temperature difference is 6.385℃. The second group of opening rates of the negative pole piece is set as: A1=5%, A2=5%, A3=5%, A4=5%, A5=5%, A6=5%, A7=5%, A8=5%, A9=5%, and the experimental calculation result is: the highest temperature is 43.426℃, the lowest temperature is 39.779℃, and the temperature difference is 3.647℃. The third group of opening rates of the negative pole piece is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=10%, A7=10%, A8=10%, A9=10%, and the experimental calculation result is: the highest temperature is 45.006℃, the lowest temperature is 38.715℃, and the temperature difference is 6.291℃. The fourth group of opening rates of the negative pole piece is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=10%, A7=10%, A8=10%, A9=20%, and the experimental calculation result is: the highest temperature is 45.047℃, the lowest temperature is 39.008℃, and the temperature difference is 6.039℃. The fifth group of opening rates of the negative pole piece is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=10%, A7=10%, A8=20%, A9=20%, and the experimental calculation result is: the highest temperature is 45.131℃, the lowest temperature is 39.714℃, and the temperature difference is 5.417℃. The sixth group of opening rates of the negative pole piece is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=10%, A7=10%, A8=20%, A9=30%, and the experimental calculation result is: the highest temperature is 45.187℃, the lowest temperature is 39.976℃, and the temperature difference is 5.211℃. The seventh group of opening rates of the negative pole piece is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=10%, A7=20%, A8=20%, A9=30%, and the experimental calculation result is: the highest temperature is 45.269℃, the lowest temperature is 40.144℃, and the temperature difference is 5.125℃. The eighth group of opening rates of the negative pole piece is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=10%, A6=20%, A7=20%, A8=20%, A9=30%, and the experimental calculation result is: the highest temperature is 45.394℃, the lowest temperature is 40.252℃, and the temperature difference is 5.142℃.The ninth group of negative electrode sheet opening ratio is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=20%, A6=20%, A7=20%, A8=20%, A9=30%, and the experimental calculation result is: the highest temperature is 45.442°C, the lowest temperature is 40.756°C, and the temperature difference is 4.686°C. The tenth group of negative electrode sheet opening ratio is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=20%, A6=20%, A7=20%, A8=30%, A9=40%, and the experimental calculation result is: the highest temperature is 45.489°C, the lowest temperature is 41.711°C, and the temperature difference is 3.778°C. The eleventh group of negative electrode sheet opening ratio is set as: A1=10%, A2=10%, A3=10%, A4=10%, A5=20%, A6=20%, A7=20%, A8=30%, A9=50%, and the experimental calculation result is: the highest temperature is 46.221°C, the lowest temperature is 43.08°C, and the temperature difference is 3.141°C. The twelfth group of negative electrode sheet opening ratio is set as: A1=80%, A2=80%, A3=80%, A4=80%, A5=80%, A6=80%, A7=80%, A8=80%, A9=80%, and the experimental calculation result is: the highest temperature is 117.28°C, the lowest temperature is 79.629°C, and the temperature difference is 37.651°C. The thirteenth group of negative electrode sheet opening ratio is set as: A1=90%, A2=90%, A3=90%, A4=90%, A5=90%, A6=90%, A7=90%, A8=90%, A9=90%, and the experimental calculation result is: the highest temperature is 213.55°C, the lowest temperature is 114.08°C, and the temperature difference is 99.47°C.

[0048] As shown in FIG. 5 and FIG. 6, the highest temperature of the general positive electrode sheet in working state is 40.58°C, the lowest temperature of the general positive electrode sheet in working state is 37.528°C, the maximum temperature difference of the general positive electrode sheet in working state is 3.052°C, the highest temperature of the length direction regionally opened positive electrode sheet is 42.579°C, the lowest temperature of the length direction regionally opened positive electrode sheet is 41.16°C, and the maximum temperature difference of the length direction regionally opened positive electrode sheet in working state is 1.419°C. The highest temperature of the general negative electrode sheet in working state is 43.131°C, the lowest temperature of the general negative electrode sheet in working state is 36.746°C, the maximum temperature difference of the general negative electrode sheet in working state is 6.385°C, the highest temperature of the length direction regionally opened negative electrode sheet is 46.221°C, the lowest temperature of the length direction regionally opened negative electrode sheet is 43.08°C, and the maximum temperature difference of the length direction regionally opened negative electrode sheet in working state is 3.141°C. Here, the general electrode sheet is an unopened electrode sheet, and in working state, the temperature difference of the length direction regionally opened electrode sheet is the smallest compared with the ordinary opened electrode sheet.

[0049] In the present embodiment, it can be seen from FIG. 5 that when the opening ratio of the positive electrode tab area is A1=A2=A3=A4=A5=A6=10%, A7=A8=20%, and A9=40%, the temperature difference is the smallest, and the temperature distribution is more uniform. It can be seen from FIG. 6 that when the opening ratio of the negative electrode tab area is A1=A2=A3=A4=10%, A5=A6=A7=A8=20%, A8=30%, and A9=50%, the temperature difference is the smallest. In the above comparison between the general tab and the general opening tab, whether the tab is opened is a single variable. In the comparison between the general opening tab and the length direction regionally opening tab, whether the length direction is regionally opened is a single variable. The single variable in FIG. 5 and FIG. 6 is the opening ratio.

[0050] Alternatively, the opening ratio of each region increases in turn along the length direction, that is, in the direction from the tab to the tab body, the opening ratio An of the next region is greater than the opening ratio A(n-1) of the previous region.

[0051] Alternatively, a plurality of through holes 2 are arranged in each region 3, and the plurality of through holes 2 have the same aperture.

[0052] The shape and distribution of the through hole 2 are not limited, and the through hole 2 can be circular or square or other shapes. The through hole 2 can be arranged in equidistant distribution or arranged in other regular distribution or irregular distribution.

[0053] The present application provides a pole core 100, which comprises the pole tab 1 of any of the above embodiments, as shown in FIG. 9. By arranging the regionally opening in the pole core 100, the pole tab 1 with the opening ratio A(n-1)≤An and at least one A(n-1)<An is improved, the heat uniformity of the pole core 100 in the working state is improved, and the mass of the pole core 100 is reduced.

[0054] The present application provides a battery 200, which comprises the pole core 100 of any of the above embodiments, as shown in FIG. 10.

[0055] The present application provides a battery device 300, which comprises the battery 200 of any of the above embodiments, as shown in FIG. 11.

[0056] Specifically, the battery device 300 of the present application refers to a device capable of converting the chemical energy stored therein into electrical energy, that is, a device capable of converting the pre-stored energy into electrical energy for external use. The battery device 300 can be charged and store electrical energy, or can be discharged to supply power to other external devices. It can be understood that the battery device 300 can include but is not limited to a battery pack, a battery module, or a battery system, etc.

[0057] Specifically, the power consuming device 400 disclosed in the present application includes the battery device 300 of any of the above embodiments or the battery 200 of any of the above embodiments, as shown in FIGS. 12 and 13. The power consuming device 400 can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric automobile, a ship or a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric plane toy, etc., and the spacecraft can include an airplane (including a drone), a rocket, a space shuttle, a spacecraft, etc.

[0058] In summary, the embodiments of the present application provide an electrode sheet 1, an electrode core 100, a battery 200, a battery device 300 and a power consuming device 400, which can effectively solve the problem of uneven heating of the electrode sheet 1, i.e., the problem of unreasonable mass distribution of the electrode sheet 1, which is not conducive to improving the fast charging performance of the battery and prolonging the cycle life of the battery.

[0059] Obviously, the above embodiments of the present application are only examples for clarity, and are not intended to limit the embodiments of the present application. Those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. It is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made in the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. An electrode (1), characterized in that, The electrode (1) includes an electrode tab (11) and an electrode body (12). The electrode tab (11) is connected to one end of the electrode body (12) along the length direction. Along the length direction, the electrode body (12) has a plurality of regions (3) arranged in sequence. Each region (3) has the same area, and each region (3) has a through hole (2). Along the length direction, the ratio of the total area of ​​the through hole (2) in each region (3) to the total area of ​​the corresponding region (3) is the aperture ratio, denoted as A. The region (3) closest to the tab (11) is designated as the first region (31), and the aperture ratio of the first region (31) is denoted as A1. The region (3) adjacent to the first region (31) is designated as the second region (32), and the aperture ratio of the second region (32) is denoted as A2. Similarly, the aperture ratio of the nth region (3) is denoted as An, where A(n-1)≤An and there exists at least one A(n-1)<An.

2. The electrode (1) according to claim 1, characterized in that, 10％≤A≤80％。 3. The electrode (1) according to claim 1 or 2, characterized in that, The electrode body (12) has 9 regions (3) along the length direction.

4. The electrode (1) according to claim 3, characterized in that, The aperture ratios of each of the aforementioned regions (3) are: A1 = A2 = A3 = A4 = A5 = A6 = 10%, A7 = A8 = 20%, A9 = 40%, or The opening ratios of each region (3) are: A1 = A2 = A3 = A4 = 10%, A5 = A6 = A7 = A8 = 20%, A8 = 30%, A9 = 50%.

5. The electrode (1) according to any one of claims 1-4, characterized in that, Along the length direction, the aperture ratio of each region (3) increases sequentially.

6. The electrode (1) according to any one of claims 1-5, characterized in that, The multiple through holes (2) are arranged regularly or irregularly.

7. The electrode (1) according to any one of claims 1-6, characterized in that, Each region (3) is provided with a plurality of through holes (2), and the plurality of through holes (2) have the same aperture.

8. The electrode (1) according to any one of claims 1-7, characterized in that, The shapes of the plurality of through holes (2) are circular and / or polygonal, respectively.

9. An electrode core (100), characterized in that, Includes the electrode (1) as described in any one of claims 1-8.

10. A battery (200), characterized in that, Including the electrode core (100) as described in claim 9.

11. A battery device (300), characterized in that, Includes the battery (200) as described in claim 10.

12. An electrical appliance (400), characterized in that, Includes the battery (200) as described in claim 10 or the battery device (300) as described in claim 11.

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