Battery cell, battery and battery device
By setting linear etching zones and sub-wire segments on the electrode sheet, the problem of insufficient wettability of the electrolyte is solved, the battery energy density and charging speed are improved, and the production cost is reduced.
Patent Information
- Application Number
- CN202421285641.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-06-05
AI Technical Summary
In the existing battery technology, the electrolyte has poor wetting properties, resulting in limited improvements in battery energy density and charging speed.
Linear etching zones and sub-wire segments are provided on the electrode sheet, and the wetting properties of the electrolyte are improved through these scribed structures.
By improving the wettability of the electrolyte, the energy density and charging speed of the battery are improved, while reducing production costs.
Smart Images
Figure CN222705522U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of battery technology, and in particular to a battery cell, a battery, and a battery device. Background Art
[0002] A battery device is often provided in an electric vehicle, and the battery device is used to provide power to the electric vehicle. The battery device includes a plurality of batteries, and the battery includes a housing, an electrolyte, and a pole piece, and the pole piece and the electrolyte are arranged in the housing. When the battery is working, the pole piece transmits charge through the electrolyte. In the related art, the electrolyte has poor wettability, which is not conducive to improving the battery energy density and charging speed.
[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention
[0004] The purpose of the present disclosure is to provide a battery cell, a battery and a battery device, thereby improving the wettability of the electrode liquid at least to a certain extent.
[0005] According to a first aspect of the present disclosure, a battery cell is provided, the battery cell comprising:
[0006] A pole piece, wherein the pole piece has a length direction and a width direction, the pole piece includes an active material area, the size of the active material area in the width direction of the pole piece is greater than or equal to 40 mm, the active material area includes at least one linear etching area, the linear etching area extends along the width direction of the pole piece, the linear etching area includes at least two sub-segments, the sub-segments extend along the width direction of the pole piece, and the first sub-segment and the second sub-segment are two adjacent sub-segments in the linear etching area.
[0007] According to a second aspect of the present disclosure, a battery is provided, comprising the above-mentioned battery cell.
[0008] According to a third aspect of the present disclosure, a battery device is provided, the battery device comprising the above-mentioned battery.
[0009] The battery cell provided by the embodiment of the present disclosure includes a pole piece, the pole piece includes an active material area, the active material area includes at least one linear etching area, the linear etching area includes a plurality of sub-segments, and the projection of the first sub-segment on the second sub-segment along the length direction does not overlap with the second sub-segment. By arranging the sub-segments on the pole piece, the wettability of the electrolyte can be improved, which is beneficial to improving the energy density and charging speed of the battery. The segmented scribing avoids the problem of excessive scribing length, the long working time of the scribing equipment during scribing, resulting in excessive temperature of the scribing equipment, and avoids the problem of insufficient energy in the rear section of the scribing due to too long a scribing time, resulting in insufficient depth of the rear section, thereby improving the uniformity of the scribing and being able to improve the efficiency of the scribing, thereby effectively reducing the production cost of the battery.
[0010] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.
[0012] Figure 1 A schematic diagram of a pole piece provided for an exemplary embodiment of the present disclosure;
[0013] Figure 2 Schematic diagrams of two pole pieces provided for exemplary embodiments of the present disclosure;
[0014] Figure 3 Schematic diagrams of three pole pieces provided for exemplary embodiments of the present disclosure;
[0015] Figure 4 Schematic diagrams of four pole pieces provided for exemplary embodiments of the present disclosure.
[0016] Description of reference numerals:
[0017] 10. Pole piece; 11. Active material region; 110. Linear etching region; 111. Sub-segment; 101. First sub-segment; 102. Second sub-segment. DETAILED DESCRIPTION
[0018] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.
[0019] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.
[0020] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.
[0021] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.
[0022] The exemplary embodiment of the present disclosure first provides a battery cell, such as Figure 1 and Figure 2 As shown, the battery cell includes a pole piece 10, and the pole piece 10 has a length direction (X direction) and a width direction (Y direction). The pole piece 10 includes an active material area 11. The size of the active material area 11 in the width direction of the pole piece 10 is greater than or equal to 40 mm. The active material area 11 includes at least one linear etching area 110, and the linear etching area 110 extends along the width direction of the pole piece 10. The linear etching area 110 includes at least two sub-segments 111, and the sub-segments 111 extend along the width direction of the pole piece 10. The first sub-segment 101 and the second sub-segment 102 are two adjacent sub-segments 111 in the linear etching area 110.
[0023] The battery cell provided by the embodiment of the present disclosure includes a pole piece 10, and the pole piece 10 includes an active material area 11. The active material area 11 includes at least one linear etching area 110. At least two sub-segments 111 are arranged in the linear etching area 110. By arranging the sub-segments 111 on the pole piece 10, the wettability of the electrolyte can be improved, which is beneficial to improving the battery energy density and charging speed. The segmented scribing avoids the problem of excessive scribing length, resulting in a long working time of the scribing equipment during scribing, resulting in excessive temperature of the scribing equipment. It also avoids the problem of insufficient energy in the rear section of scribing and insufficient depth of the rear section due to a long scribing time. The uniformity of scribing is improved, and the efficiency of scribing can be improved, thereby effectively reducing the production cost of the battery.
[0024] The battery cell provided by the embodiment of the present disclosure is described in detail below:
[0025] In the disclosed embodiment, the battery cell may be a wound battery cell or a stacked battery cell. In the wound battery cell, the electrode sheet 10 and the diaphragm are wound to form the battery cell. In the stacked battery cell, the electrode sheet 10 and the diaphragm are folded to form the battery cell.
[0026] The pole piece 10 includes a conductive layer and an active material layer coated on the surface of the conductive layer. The active material layer can be coated on one side of the conductive layer, or on both sides of the conductive layer. The active material layer forms an active material region 11 of the pole piece 10. One side of the pole piece 10 has an active material region 11, or both sides of the pole piece 10 are provided with active material regions 11. When active material regions 11 are provided on both sides of the pole piece 10, the active material regions 11 on both sides of the pole piece 10 can be overlapped in a direction perpendicular to the pole piece 10, or the active material regions 11 on both sides of the pole piece 10 can be staggered in a direction perpendicular to the pole piece 10.
[0027] The pole piece 10 has a length direction and a width direction that are perpendicular to each other. The length direction and the width direction of the pole piece 10 refer to the length direction and the width direction of the pole piece 10 in a flattened state. The length direction of the pole piece 10 can be understood as the conveying direction of the pole piece 10, and the width direction of the pole piece 10 is perpendicular to the conveying direction of the pole piece 10. It is worth noting that in the embodiment of the present disclosure, the length direction and the width direction of the pole piece 10 are named only for the convenience of description, which does not mean that the length direction is necessarily longer than the width direction.
[0028] A sub-segment 111 is provided on the pole piece 10, and the sub-segment 111 can be understood as a long and narrow groove. For example, the length of the sub-segment 111 is three times or more than the width of the sub-segment 111. The sub-segment 111 on the pole piece 10 can be a through groove that penetrates the pole piece 10, or the sub-segment 111 on the pole piece 10 can also be a blind groove that does not penetrate the pole piece 10. When the sub-segment 111 is a blind groove, the sub-segment 111 can penetrate the active material layer and terminate at the surface of the conductive layer; or the sub-segment 111 penetrates the active material layer and partially extends to the conductive layer; or the sub-segment 111 can be a blind groove that does not penetrate the active material layer. For example, the sub-segment 111 can be formed by laser processing.
[0029] The depth of the sub-segment 111 is 5 μm-505 μm. For example, the depth of the sub-segment 111 may be 5 μm, 10 μm, 50 μm, 100 μm, 200 μm, 300 μm, 400 μm or 505 μm.
[0030] The active material region 11 is provided with a plurality of linear etching regions 110, and the linear etching regions 110 extend along the width direction of the pole piece 10. For example, the linear etching regions 110 extend from one end of the active material region 11 along the width direction to the other end, and the plurality of linear etching regions 110 are arranged in sequence along the length direction of the pole piece 10. In the embodiment of the present disclosure, when the pole piece 10 is in a flattened state, the pole piece 10 is rectangular. On this basis, the active material region 11 is also roughly rectangular, and the linear etching regions 110 are rectangular regions arranged in sequence in the active material region 11. For example, the linear etching regions 110 are a plurality of rectangular regions arranged in sequence, and adjacent linear etching regions 110 are connected.
[0031] A plurality of sub-segments 111 are arranged in the linear etching area 110. The sub-segments 111 extend along the width direction of the electrode piece 10 in the linear etching area 110, that is, the length direction of the sub-segment 111 is along the width direction of the electrode piece 10. The projection of the first sub-segment 101 on the second sub-segment 102 along the length direction of the electrode piece 10 does not overlap (does not completely overlap) with the second sub-segment 102. The first sub-segment 101 and the second sub-segment 102 are two adjacent sub-segments 111 in the linear etching area 110. That is, any two sub-segments 111 in the linear etching area 110 are staggered in the length direction of the electrode piece 10. The size of a single sub-segment 111 in the linear etching area 110 in the width direction of the electrode piece 10 is smaller than the size of the active material area 11 in the width direction of the electrode piece 10. When a plurality of sub-line segments 111 are provided in the linear etching area 110 , the plurality of sub-line segments 111 in the linear etching area 110 may be processed simultaneously by a plurality of laser scribing devices.
[0032] By setting a plurality of segmented sub-segments 111 in the linear etching area 110, the length of a single sub-segment 111 is reduced, and the problem of the scribing equipment working for a long time at a time when forming the sub-segment 111, which is caused by the sub-segment 111 being too long, resulting in the scribing equipment temperature being too high, is avoided. The problem of insufficient energy in the rear section of the scribing and insufficient depth in the rear section caused by the long scribing time is also avoided, and the uniformity of the scribing is improved. The simultaneous processing of multiple sub-segments 111 is conducive to improving production efficiency. In addition, the staggered arrangement of multiple sub-segments 111 in the linear etching area 110 ensures that the linear etching area 110 has a relatively long sub-segment 111 in the width direction of the pole piece 10, which is conducive to improving the wettability of the electrolyte.
[0033] It should be noted that the linear etching area 110 mentioned in the embodiment of the present disclosure has the first sub-segment 101 and the second sub-segment 102, which does not mean that there are only two sub-segments 111 in the linear etching area 110. In actual applications, the number of sub-segments 111 in the linear etching area 110 can be two, three, four or more.
[0034] In a possible implementation, if Figure 2 As shown, in the same linear etching area 110, a plurality of sub-segments 111 are arranged along a straight line, and in the same linear etching area 110, there is a first gap between the first sub-segment 101 and the second sub-segment 102, and the dimension of the first gap along the width direction is b, and the width of the pole piece 10 is m. The ratio of b / m ranges from 0 to 15%, for example, b / m is 0.1%, 1%, 5%, 10% or 15%, etc.
[0035] The orthographic projections of the sub-segment 111 in the first linear etching area and the sub-segment 111 in the second linear etching area along the length direction of the pole piece at least partially overlap. The distance between the sub-segment 111 in the first linear etching area and the sub-segment 111 in the second linear etching area along the length direction of the pole piece 10 is a, and the first linear etching area and the second linear etching area are adjacent; that is, the distance between the two adjacent sub-segments 111 in the length direction of the pole piece 10 is a. The ratio of a / m ranges from 0.1% to 10%, for example, a / m is 0.1%, 1%, 5% or 10%, etc.
[0036] By setting the ratio range of a / m to 0.1%-10% and the ratio range of b / m to 0-15%, the normal operation of the two lasers and the protection of the foil between the two sub-segments 111 from damage are ensured, while the arrangement of the sub-segments 111 can also improve the electrolyte wetting performance.
[0037] It should be noted that the arrangement of multiple sub-line segments 111 along a straight line in the same linear etching area 110 in the embodiment of the present disclosure means that the multiple sub-line segments 111 in the same linear etching area 110 are approximately arranged along a straight line on the basis of ignoring processing errors.
[0038] On this basis, the length of the sub-line segment 111 is c, and the ratio of c / m ranges from 10% to 50%. For example, the ratio of c / m can be 10%, 15%, 18%, 20%, 30%, 40%, 47% or 50%.
[0039] The sub-segments 111 in the first linear etching area and the sub-segments 111 in the second linear etching area are aligned along the length direction, the ratio of a / m is in the range of 0.1%-10%, and the ratio of b / m is in the range of 0.1%-15%. The sub-segments 111 in the multiple linear etching areas 110 are arranged in parallel, and the laser movement trajectory and debugging parameters are highly consistent, which is conducive to the realization of the operation.
[0040] Among them, the number of sub-segments 111 in the first linear etching area is the same as the number of sub-segments 111 in the second linear etching area, and the distribution mode of the sub-segments 111 in the first linear etching area is the same as the distribution mode of the sub-segments 111 in the second linear etching area. That is, the sub-segments 111 in the first linear etching area correspond to the sub-segments 111 in the second linear etching area one by one. The sub-segments 111 in the first linear etching area and the sub-segments 111 in the second linear etching area are aligned along the length direction, which means that the sub-segments 111 in the first linear etching area are aligned with the corresponding sub-segments 111 in the second linear etching area. Alignment means that the sub-segments 111 in the first linear etching area are completely overlapped in the orthographic projection of the sub-segments 111 in the second linear etching area along the length direction of the pole piece 10 and the sub-segments 111 in the second linear etching area.
[0041] It is understandable that if Figure 3 As shown, when a plurality of collinear sub-segments 111 are arranged in the linear etching area 110, the sub-segments 111 in the first linear etching area and the sub-segments 111 in the second linear etching area can also be staggered along the length direction, and the ratio of a / m is in the range of 0.1%-10%, and the ratio of b / m is in the range of 0.1%-15%. In adjacent group division areas, the sub-segments 111 in one linear etching area 110 will be staggered with a sub-segment 111 in another linear etching area 110, ensuring that the orthographic projection of the sub-segments 111 in the length direction can basically cover the width of the electrode 10, ensuring the uniformity of the improvement of the electrolyte wetting performance of the electrode 10.
[0042] Among them, the number of sub-segments 111 in the first linear etching area is the same as the number of sub-segments 111 in the second linear etching area, and the distribution mode of the sub-segments 111 in the first linear etching area is the same as the distribution mode of the sub-segments 111 in the second linear etching area. That is, the sub-segments 111 in the first linear etching area correspond to the sub-segments 111 in the second linear etching area one by one. The sub-segments 111 in the first linear etching area and the sub-segments 111 in the second linear etching area are staggered along the length direction, which means that the sub-segments 111 in the first linear etching area and the corresponding sub-segments 111 in the second linear etching area are staggered. The staggered setting means that the sub-segments 111 in the first linear etching area along the length direction of the pole piece 10 are not completely overlapped in the orthographic projection of the sub-segments 111 in the second linear etching area and the sub-segments 111 in the second linear etching area.
[0043] In another possible implementation, if Figure 4 As shown, in the same linear etching area 110, the first sub-segment 101 and the second sub-segment 102 are not collinear, the distance between the first sub-segment 101 and the second sub-segment 102 along the length direction is a, and the orthographic projection of the first sub-segment 101 on the second sub-segment 102 along the length direction has an overlapped area, and the size of the overlapped area along the width direction is b. The width of the pole piece 10 is m, the ratio of a / m ranges from 0.1% to 5%, and the ratio of b / m ranges from 0 to 15%.
[0044] Because the first sub-segment 101 and the second sub-segment 102 are not colinear, the orthographic projection of the first sub-segment 101 on the second sub-segment 102 along the length direction has an overlapping area, so that the length of the sub-segment 111 can be set to be longer, thereby improving the electrolyte wetting performance.
[0045] On this basis, the length of the sub-segment 111 is c, and the ratio of c / m ranges from 10% to 90%. For example, the ratio of c / m is 10%, 14%, 20%, 30%, 40%, 50%, 55%, 60%, 70%, 80%, 88% or 90%.
[0046] When a plurality of non-collinear sub-segments 111 are arranged in the linear etching area 110, the sub-segments 111 in the first linear etching area and the sub-segments 111 in the second linear etching area are aligned along the length direction, and the ratio of a / m is in the range of 0.1%-10%, and the ratio of b / m is in the range of 0.1%-15%. The sub-segments 111 in the plurality of linear etching areas 110 are arranged in parallel, and the laser movement trajectory and debugging parameters are highly consistent, which is conducive to the realization of the operation.
[0047] Among them, the number of sub-segments 111 in the first linear etching area is the same as the number of sub-segments 111 in the second linear etching area, and the distribution mode of the sub-segments 111 in the first linear etching area is the same as the distribution mode of the sub-segments 111 in the second linear etching area. That is, the sub-segments 111 in the first linear etching area correspond to the sub-segments 111 in the second linear etching area one by one. The sub-segments 111 in the first linear etching area and the sub-segments 111 in the second linear etching area are aligned along the length direction, which means that the sub-segments 111 in the first linear etching area are aligned with the corresponding sub-segments 111 in the second linear etching area. Alignment means that the sub-segments 111 in the first linear etching area are completely overlapped in the orthographic projection of the sub-segments 111 in the second linear etching area along the length direction of the pole piece 10 and the sub-segments 111 in the second linear etching area.
[0048] It is understandable that when a plurality of non-collinear sub-segments 111 are provided in the linear etching area 110, the sub-segments 111 in the first linear etching area and the sub-segments 111 in the second linear etching area can also be staggered along the length direction, and the ratio of a / m is in the range of 0.1%-10%, and the ratio of b / m is in the range of 0.1%-15%. In adjacent group division areas, the sub-segments 111 in one linear etching area 110 will be staggered with a sub-segment 111 in another linear etching area 110, ensuring that the orthographic projection of the sub-segment 111 in the length direction can basically cover the width of the electrode 10, ensuring the uniformity of the improvement of the electrolyte wetting performance of the electrode 10.
[0049] Among them, the number of sub-segments 111 in the first linear etching area is the same as the number of sub-segments 111 in the second linear etching area, and the distribution mode of the sub-segments 111 in the first linear etching area is the same as the distribution mode of the sub-segments 111 in the second linear etching area. That is, the sub-segments 111 in the first linear etching area correspond to the sub-segments 111 in the second linear etching area one by one. The sub-segments 111 in the first linear etching area and the sub-segments 111 in the second linear etching area are staggered along the length direction, which means that the sub-segments 111 in the first linear etching area and the corresponding sub-segments 111 in the second linear etching area are staggered. The staggered setting means that the sub-segments 111 in the first linear etching area along the length direction of the pole piece 10 are not completely overlapped in the orthographic projection of the sub-segments 111 in the second linear etching area and the sub-segments 111 in the second linear etching area.
[0050] It should be noted that the pole piece 10 in the embodiment of the present disclosure may be a positive pole piece or a negative pole piece. The pole piece 10 may include a current collector (conductive layer) and an electrode coating (active material layer), and the electrode coating is coated on the surface of the current collector. In practical applications, the electrode powder can be mixed into a coating liquid, the coating liquid can be applied to the current collector, and then the pole piece 10 is formed through processes such as rolling and die cutting.
[0051] The current collector of the positive electrode sheet is an aluminum current collector, and a positive electrode material is coated on the surface of the aluminum current collector to form a positive electrode sheet. The current collector of the negative electrode sheet is a copper current collector, and a negative electrode material is coated on the copper current collector to form a negative electrode sheet. The thickness of the aluminum current collector is greater than that of the copper current collector. Of course, in other embodiments, the current collector may also be made of other materials, and the embodiments of the present disclosure are not limited thereto.
[0052] The battery cell provided by the embodiment of the present disclosure includes a pole piece 10, and the pole piece 10 includes an active material area 11, and the active material area 11 includes at least one linear etching area 110. At least two discontinuous sub-segments 111 are arranged in the linear etching area 110, and the projection of the first sub-segment 101 on the second sub-segment 102 along the length direction does not overlap with the second sub-segment 102. By arranging the sub-segments 111 on the pole piece 10, the wettability of the electrolyte can be improved, which is beneficial to improving the battery energy density and charging speed. The segmented sub-segments 111 avoid the problem of excessively long marking length, resulting in a long working time of the marking equipment during marking, resulting in excessively high temperature of the marking equipment, and avoid the problem of insufficient energy in the rear section of marking due to a long marking time, resulting in insufficient depth of the rear section, thereby improving the uniformity of marking and being able to improve the efficiency of marking, thereby effectively reducing the production cost of the battery.
[0053] The disclosed embodiment also provides a battery, the battery comprising a battery cell. The battery cell comprises a pole piece 10, the pole piece 10 has a length direction and a width direction perpendicular to each other, the pole piece 10 comprises an active material region 11, the size of the active material region 11 in the width direction is greater than or equal to 40 mm, the active material region 11 comprises at least one linear etching region 110, the linear etching region 110 extends from one end of the active material region 11 to the other end along the width direction, the linear etching region 110 has at least two discontinuous sub-segments 111, the sub-segments 111 extend along the width direction, and the projection of the first sub-segment 101 on the second sub-segment 102 along the length direction does not overlap with the second sub-segment 102, and the first sub-segment 101 and the second sub-segment 102 are two adjacent sub-segments 111 in the linear etching region 110.
[0054] The battery may be a prismatic battery, such as a quadrangular battery (square battery) or a hexagonal battery, or a cylindrical battery. In a prismatic battery, the cell may be a wound cell or a laminated cell, and in a cylindrical battery, the cell may be a wound cell.
[0055] Furthermore, the battery provided by the embodiment of the present disclosure may also include a shell, a pole and a current collector, etc. The shell has a receiving cavity, the battery cell is arranged in the receiving cavity of the shell, and an electrolyte is also arranged in the receiving cavity, and the battery cell is at least partially immersed in the electrolyte. The pole is arranged in the shell, and the pole is used as the electrode end of the battery. The current collector is arranged in the receiving cavity, and the current collector connects the battery cell and the pole. The pole piece 10 may also be provided with a pole ear, and the pole ear is connected to the current collector.
[0056] The battery provided by the embodiment of the present disclosure includes a battery cell, in which the electrode 10 includes an active material area 11, and the active material area 11 includes at least one linear etching area 110. At least two discontinuous sub-segments 111 are arranged in the linear etching area 110, and the projection of the first sub-segment 101 on the second sub-segment 102 along the length direction does not overlap with the second sub-segment 102. By arranging the sub-segments 111 on the electrode 10, the wettability of the electrolyte can be improved, which is beneficial to improving the energy density and charging speed of the battery. The segmented sub-segments 111 avoid the problem that the sub-segments 111 are too long, resulting in a long working time of the marking equipment during marking, resulting in excessive temperature of the marking equipment. The problem that the energy of the rear section of the marking is insufficient due to the long marking time is avoided, resulting in insufficient depth of the rear section, thereby improving the uniformity of the marking and being able to improve the efficiency of the marking, thereby effectively reducing the production cost of the battery.
[0057] The exemplary embodiments of the present disclosure further provide a battery device, which may include a battery. For example, the battery device may be a battery module or a battery pack.
[0058] The battery pack provided in the embodiment of the present disclosure can be applied to an electric vehicle. The battery pack is installed on the electric vehicle to provide energy to the electric vehicle. In practical applications, the battery pack can be installed on the frame of the electric vehicle. The battery pack can be fixedly connected to the frame. Alternatively, the battery pack can be a modular battery pack, which can be detachably connected to the vehicle body for easy replacement.
[0059] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.
Claims
1. A battery cell, characterized in that: The battery cell comprises: A pole piece, wherein the pole piece has a length direction and a width direction, the pole piece includes an active material area, the size of the active material area in the width direction of the pole piece is greater than or equal to 40 mm, the active material area includes at least one linear etching area, the linear etching area extends along the width direction of the pole piece, the linear etching area includes at least two sub-segments, the sub-segments extend along the width direction of the pole piece, and the first sub-segment and the second sub-segment are two adjacent sub-segments in the linear etching area.
2. The battery cell according to claim 1, characterized in that: Multiple sub-line segments in the same linear etching area are arranged along a straight line, and there is a first gap between two adjacent sub-line segments in the same linear etching area. The dimension of the first gap along the width direction of the pole piece is b, the width of the pole piece is m, and b / m is 0.1%-15%.
3. The battery cell according to claim 2, characterized in that: The orthographic projections of the sub-line segment in the first linear etching area and the sub-line segment in the second linear etching area along the length direction of the pole piece at least partially overlap, the first linear etching area and the second linear etching area are adjacent, the distance between the sub-line segment in the first linear etching area and the sub-line segment in the second linear etching area along the length direction of the pole piece is a, the width of the pole piece is m, and the ratio of a / m ranges from 0.1% to 10%.
4. The battery cell according to claim 1, characterized in that: In the same linear etching area, two adjacent sub-line segments are not collinear, the distance between the two sub-line segments along the length direction of the pole piece is a, the width of the pole piece is m, and the ratio of a / m is in the range of 0.1%-5%.
5. The battery cell according to claim 4, characterized in that: In the same linear etching area, the orthographic projection of the first sub-segment along the length direction of the pole piece and the orthographic projection of the second sub-segment along the length direction of the pole piece have an overlapping area, the size of the overlapping area along the width direction of the pole piece is b, the width of the pole piece is m, and b / m is 0-15%.
6. The battery cell according to claim 1, characterized in that: The length of the sub-line segment is c, and the ratio of c / m ranges from 10% to 90%.
7. The battery cell according to claim 1, characterized in that: The depth of the sub-line segment is 5 μm-505 μm.
8. The battery cell according to claim 1, characterized in that: The sub-line segments are formed by laser etching.
9. A battery, characterized in that: The battery comprises the battery cell according to any one of claims 1 to 8.
10. A battery device, characterized in that: The battery device comprises the battery according to claim 9.