CN218769987U - Battery core and battery - Google Patents
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- CN218769987U CN218769987U CN202222728094.7U CN202222728094U CN218769987U CN 218769987 U CN218769987 U CN 218769987U CN 202222728094 U CN202222728094 U CN 202222728094U CN 218769987 U CN218769987 U CN 218769987U
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Abstract
The present disclosure relates to a battery cell and a battery. The battery cell is formed by sequentially laminating and winding a first pole piece, a diaphragm and a second pole piece. The battery cell has a winding center portion extending in a longitudinal direction and first and second straight portions located on both sides of the winding center portion in a width direction perpendicular to the longitudinal direction, in a plane perpendicular to and on one side of a winding surface of the battery cell. One side of the first pole piece is electrically connected with a plurality of first pole lugs, and the plurality of first pole lugs are distributed on the first straight line part and the second straight line part after being wound. The plurality of first tabs are divided into a plurality of groups. The first tabs of the same group are overlapped in the width direction, so that the first tabs of the plurality of groups respectively form a plurality of first sub-electrodes according to grouping. Adjacent two first sub-electrodes in the plurality of first sub-electrodes have a spacing in the length direction. The plurality of first sub-electrodes collectively form a first electrode of the first pole piece.
Description
Technical Field
The embodiment of the disclosure relates to the field of batteries, in particular to a battery core and a battery.
Background
The lithium battery has the advantages of environmental protection, light weight, high energy density and the like, and is widely applied to the fields of mobile phones, electric tools and the like. In recent years, the market has made higher demands on the capacity of the cell. The square battery has high packaging reliability; the system has high energy efficiency; relatively light weight and high energy density; the structure is simpler, and the dilatation is convenient relatively, is the important option that improves energy density through improving monomer capacity at present. For the manufacture of the battery core, at present, two processes of lamination and winding are available, wherein the winding manufacture efficiency is high, so that the winding process is mostly adopted in the industry at present. For the winding process, a multi-tab die cutting mode is generally adopted in the industry at present to process the pole piece, then the multi-tab is aligned, and then the subsequent ultrasonic welding and laser welding are carried out. The power of welding machine has decided the number of piles restriction of utmost point ear, and power crosses lowly can't guarantee that all utmost point ears all are effectively welded, both influences the ability of overflowing, can't guarantee structural strength again, and the power is too high can make the utmost point ear on surface receive irreversible destruction, reduces the yields of battery. Therefore, a new tab structure is urgently needed to be developed.
The prior art scheme can increase the number of the lugs to a certain extent, and ensure the current-carrying capacity of the lugs, but the lug plates in the prior art are usually arranged at intervals (staggered among the lugs), and the problems of large internal resistance of the battery and uneven current distribution still exist to a certain extent because of certain distance at intervals. It is difficult to achieve the requirements of high power discharge.
SUMMERY OF THE UTILITY MODEL
The technical problem that this disclosure will solve is to the above-mentioned defect that exists among the prior art, this disclosure is based on this type of demand, has proposed a kind of electric core and battery, can increase the quantity of the utmost point ear of single electrode, improves the ability of overflowing of electric core, improves the power level of battery, can weld a plurality of sub-electrodes one by one again, makes the quantity of the utmost point ear of welding at every turn not increase, improves the mechanical strength of utmost point ear welding department, guarantees the effective welding of utmost point ear, reduces the battery internal resistance, makes utmost point ear current distribution more even.
According to one aspect of an embodiment of the present disclosure, an embodiment of the present disclosure provides a battery cell. The battery cell is formed by sequentially stacking and winding a first pole piece, a diaphragm and a second pole piece. The battery cell has a winding center portion extending in a longitudinal direction and first and second straight portions located on both sides of the winding center portion in a width direction perpendicular to the longitudinal direction, in a plane perpendicular to and on one side of a winding surface of the battery cell. One side of the first pole piece is electrically connected with a plurality of first pole lugs, the first pole lugs are distributed on the first linear portion and the second linear portion after being wound, and the first pole lugs are divided into a plurality of groups. The first tabs of the same group are overlapped in the width direction so that the first tabs of a plurality of groups respectively form a plurality of first sub-electrodes according to grouping. Two adjacent first sub-electrodes in the plurality of first sub-electrodes have a spacing in the length direction. The plurality of first sub-electrodes collectively form a first electrode of the first pole piece.
In some embodiments, adjacent two of the first sub-electrodes in the plurality of first sub-electrodes have a center-to-center distance d in the length direction. d is more than or equal to 1/2 (d) i +d i+1 ) In which d is i The length of the ith group of the first pole ear in the length direction is defined.
In some embodiments, projections of the plurality of first sub-electrodes on a plane perpendicular to the length direction at least partially coincide.
In some embodiments, the plurality of first tabs are divided into two or three groups to form two or three first sub-electrodes.
In some embodiments, a plurality of second tabs are electrically connected to one side of the second pole piece, the plurality of second tabs are distributed on the first linear portion and the second linear portion after being wound, and the plurality of second tabs are divided into a plurality of groups. The second tabs of the same group overlap in the width direction so that the first tabs of a plurality of groups form a plurality of second sub-electrodes according to grouping. Two adjacent second sub-electrodes in the plurality of second sub-electrodes have a spacing in the length direction. The plurality of second sub-electrodes collectively form a second electrode of the second pole piece.
In some embodiments, the first tab of the first pole piece and the second tab of the second pole piece are disposed on the same side or opposite sides of the cell.
In some embodiments, the lengths of the first tabs of the same group in the length direction are equal or different, and/or the lengths of the first tabs of different groups in the length direction are equal or different.
In some embodiments, a plurality of adjacent two of the first sub-electrodes in the plurality of first sub-electrodes have the same pitch in the length direction.
In some embodiments, a plurality of adjacent two of the first sub-electrodes in the plurality of first sub-electrodes have different pitches in the length direction.
In some embodiments, the number of the first tabs located at the first rectilinear portion is the same as the number of the first tabs located at the second rectilinear portion.
In some embodiments, the number of the first tabs located at the first rectilinear portion is different from the number of the first tabs located at the second rectilinear portion.
According to an aspect of the embodiments of the present disclosure, there is provided a battery cell including one or more of the above-described batteries.
The beneficial effects of the disclosed embodiment are that the power level of the battery can be further improved on the basis of improving the mechanical strength of the tab welding position, ensuring the effective welding of the tab and reducing the internal resistance of the battery, so that the current distribution of the tab is more uniform.
Drawings
Fig. 1 is a schematic view of a cell according to a first embodiment of the present disclosure;
fig. 2 is a schematic diagram of a first pole piece of a cell according to a first embodiment of the present disclosure;
fig. 3 is a partially enlarged view of a battery cell according to a first embodiment of the present disclosure;
fig. 4 is a schematic diagram of a cell according to a second embodiment of the present disclosure;
fig. 5 is a schematic diagram of a first pole piece of a cell according to a second embodiment of the present disclosure;
fig. 6 is a partially enlarged view of a cell according to a second embodiment of the present disclosure;
fig. 7 is a schematic view of a cell according to a third embodiment of the present disclosure;
fig. 8 is a schematic diagram of a first pole piece of a cell according to a third embodiment of the present disclosure;
fig. 9 is a partially enlarged view of a battery cell according to a third embodiment of the present disclosure.
Reference numerals:
(1: the battery core is provided with a battery core,
(10: the central portion is wound up and,
(11: a first straight line part, a second straight line part,
(12: a second straight line portion, which is provided with a first straight line portion,
(20: a first pole piece, a second pole piece,
(21: a first set of first tabs of the first pole piece,
(22: a second group of first tabs of the first pole piece,
223: a third group of first tabs of the first pole piece,
(24: a first sub-electrode of the first pole piece,
(27: a first electrode of the first pole piece,
(34: a second sub-electrode of the second pole piece,
(37: a second electrode of the second pole piece.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular structures, in order to provide a thorough understanding of the present disclosure. However, it will be apparent to one skilled in the art that the present disclosure may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, circuits, and methods are omitted so as not to obscure the description of the present disclosure with unnecessary detail.
Furthermore, in the description of the present disclosure, unless otherwise specified, expressions in the singular form may include a plural concept.
In the description of the present disclosure, it should be noted that the terms "top", "bottom", "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when products are used, and are merely used for convenience in describing and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present disclosure. Of course, the positional relationship between the components is subject to the actual orientation when the battery is attached to the corresponding device.
Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying a relative importance or order.
In addition, it should be noted that the features of the embodiments of the present disclosure may be arbitrarily combined with each other without being indicated as conflicting.
The embodiment of the disclosure provides a battery core and a battery.
Fig. 1 to 9 show a cell (1. The battery cell (1. The battery core (1. In a plane perpendicular to and on one side of the winding plane of the cell (1. The winding surface of the battery cell is a surface formed during the winding process of the battery cell, and for convenience of illustration, the battery cell of the embodiment of the present disclosure is placed in a state where the winding surface is vertical, and is not limited herein. More specifically, the first pole piece forms a plurality of linear winding surfaces when being wound, and the linear winding surfaces are positioned at two sides of the winding center part to form a first linear part and a second linear part respectively.
In an example, the cell (1.
One side (e.g. on the upper side of the wound cell) of the first pole piece (20. The plurality of first tabs are distributed between the first straight portion (11. In other words, the first rectilinear portion (11. A plurality of first tabs (21. For example, in the first and second embodiments, the first tabs are divided into two groups, a first group of first tabs (21) and a second group of first tabs (22. In the third embodiment, the first tabs are divided into three groups, that is, a first group first tab 221, a second group first tab 222, and a third group first tab 223.
The first tabs of the same group are overlapped in the width direction, so that the first tabs of the plurality of groups respectively form a plurality of first sub-electrodes according to grouping. For example, in the first and second embodiments, the first group of first tabs (21. In the third embodiment, the first group first tabs 221 are overlapped with each other in the width direction to form the first sub-electrodes 224, the second group first tabs 222 are overlapped with each other in the width direction to form the first sub-electrodes 225, and the third group first tabs 223 are overlapped with each other in the width direction to form the first sub-electrodes 226.
Two adjacent first sub-electrodes in the plurality of first sub-electrodes have a spacing in the length direction. For example, in the first and second embodiments, the first sub-electrode (24. In the third embodiment, the first sub-electrodes 224 and 225 and the first sub-electrodes 225 and 226 have center-to-center distances d and d' in the length direction, respectively.
The plurality of first sub-electrodes collectively form a first electrode of the first pole piece. For example, in the first and second embodiments, the first sub-electrode (24) and the first sub-electrode (25. In the third embodiment, the first sub-electrode 224, the first sub-electrode 225 and the first sub-electrode 226 together form the first electrode 227 of the first pole piece 220.
Therefore, by arranging the plurality of first tabs, the overcurrent capacity of the battery cell can be improved, and the power level of the battery is improved. A plurality of sub-electrodes with intervals in the length direction are formed by grouping a plurality of first lugs, and the plurality of sub-electrodes can be welded one by one, so that the number of the lugs welded at each time is not increased, the mechanical strength of the lug welding position is improved, the effective welding of the lugs is ensured, the internal resistance of a battery is reduced, and the current distribution of the lugs is more uniform.
In some embodiments, two adjacent first sub-electrodes of the plurality of first sub-electrodes have centers in the length directionThe spacing may be d ≧ 1/2 (d) i +d i+1 ) In which d is i The maximum length of the ith group of the first tabs in the length direction is shown. For example, in the first embodiment, the length of the first group of the first tabs 21 in the length direction is d 1 The length of the second group of the first tabs 22 in the length direction is d 2 The center-to-center distance d between the first sub-electrode 24 and the first sub-electrode 25 in the length direction is larger than or equal to 1/2 (d) i +d i+1 ). The researchers of the present disclosure found in the research that, at such a spacing, the welding effect of the sub-electrodes is better, and the current distribution of the tab is more uniform. It should be noted that the center-to-center distance d between the first sub-electrode 24 and the first sub-electrode 25 refers to a distance between a center point of the first sub-electrode 24 in the length direction and a center point of the first sub-electrode 25 in the length direction.
In some embodiments, the lengths of the first tabs of the same group in the length direction may be equal to make the current distribution more uniform.
In some embodiments, the lengths of the first tabs of the same group in the length direction may be unequal to facilitate welding. In this case, the distance between two adjacent first sub-electrodes in the length direction is determined by the shortest distance between the first tabs of different groups.
In some embodiments, the lengths of the different sets of first tabs in the length direction may be equal to make the current distribution more uniform.
In some embodiments, lengths of the different groups of the first tabs in the length direction may be unequal, so as to adjust the composition of the first sub-electrode according to the structure of the battery cell.
In some embodiments, projections of the plurality of first sub-electrodes on a plane perpendicular to the length direction may at least partially coincide to make the current distribution more uniform. In other words, the plurality of first sub-electrodes have aligned portions as viewed in the lengthwise direction. For example, in the second embodiment, the first sub-electrode 124 and the first sub-electrode 125 each include the first tabs distributed on the first straight portion 111 and the second straight portion 112, so that the projections of the first sub-electrode 124 and the first sub-electrode 125 on the plane perpendicular to the length direction may at least partially coincide (have aligned portions). In some embodiments, the projections of the plurality of first sub-electrodes on a plane perpendicular to the length direction may completely coincide, i.e. the plurality of first sub-electrodes are completely aligned, viewed in the length direction. For ease of understanding, in fig. 6 and 9, the first sub-electrode (124.
In some embodiments, the distance between two adjacent first sub-electrodes in the plurality of first sub-electrodes in the length direction may be the same, so that the current distribution is more uniform. In some embodiments, the distance between two adjacent first sub-electrodes in the plurality of first sub-electrodes in the length direction may also be different, so as to adjust the distribution of the first sub-electrodes according to the structure of the battery cell.
In some embodiments, the number of the first tabs located at the first straight portion is the same as the number of the first tabs located at the second straight portion, so that the current distribution is more uniform.
In some embodiments, one side (e.g., the upper side) of the second pole piece may be electrically connected with a plurality of second tabs. The plurality of second tabs are distributed after winding between the first rectilinear portion (11. In other words, the first rectilinear portion (11. The plurality of second ears are divided into a plurality of groups. For example, in the first and second embodiments, the second ears are divided into two groups. In a third embodiment, the second ears are grouped into three groups. The second tabs of the same group are overlapped in the width direction, so that the second tabs of the plurality of groups respectively form a plurality of second sub-electrodes according to the grouping. For example, in the first and second embodiments, the first group of second tabs are overlapped with each other in the width direction to form a second sub-electrode (34. In the third embodiment, the first group of second tabs are overlapped with each other in the width direction to form the second sub-electrode 234, the second group of second tabs are overlapped with each other in the width direction to form the second sub-electrode 235, and the third group of second tabs are overlapped with each other in the width direction to form the second sub-electrode 236. Two adjacent second sub-electrodes in the plurality of second sub-electrodes have a spacing in the length direction. For example, in the first and second embodiments, the second sub-electrode (34. In the third embodiment, the second sub-electrodes 234 and 235 and the second sub-electrodes 235 and 236 are spaced apart in the length direction, respectively. The plurality of second sub-electrodes collectively form a second electrode of the second pole piece. For example, in the first and second embodiments, the second sub-electrode (34, 134) and the second sub-electrode (35, 135) together form a second electrode (37. In the third embodiment, the second sub-electrode 234, the second sub-electrode 235, and the second sub-electrode 236 collectively form a second electrode 237 of the second pole piece.
It is noted that the configuration of the second pole piece may be the same as or similar to that of the first pole piece. In some embodiments, a second pole piece constructed similarly to the first pole piece in the first embodiment may be used in the second embodiment, without limitation. Meanwhile, although the second electrode in the embodiment of fig. 1 to 9 also adopts the above-mentioned sub-electrode configuration, in practice, the second electrode may also be formed by adopting other configurations, such as a single tab, a plurality of completely overlapped tabs, and the like, without being limited thereto.
In some embodiments, the first tab of the first pole piece and the second tab of the second pole piece may be disposed on the same side or on opposite sides of the cell. That is, the first side of the first pole piece and the second side of the second pole piece may be disposed in the same direction (i.e., on the same side of the battery cell) or in different directions (i.e., on opposite sides of the battery cell) during winding. In other words, the upper and lower sides of the cell may be provided with electrodes formed of tabs. Therefore, the first electrode formed by the first tab and the second electrode formed by the second tab may be located on the upper side or the lower side of the battery cell at the same time, or on the upper side and the lower side of the battery cell respectively.
In some embodiments, the first pole piece may be a positive pole piece and the second pole piece may be a negative pole piece.
It should be noted that, for convenience of illustration, the embodiment of fig. 1 to 9 only illustrates the case where the first electrode and the second electrode are located on the same side, and is not limited herein.
According to another aspect of the embodiments of the present disclosure, there is provided a battery including one or more of the battery cells described above. For example, a plurality of the above-described cells may be formed into a cell pack (e.g., by stacking) and connected using a connecting device to form a battery.
Hereinafter, various embodiments of the present disclosure are described in detail.
First embodiment
Fig. 1 to 3 show schematic views of a cell according to a first embodiment of the present disclosure. Fig. 1 is a schematic diagram of a battery cell 1 according to a first embodiment of the present disclosure. Fig. 2 is a schematic diagram of a first pole piece 20 of a battery cell 1 according to a first embodiment of the present disclosure. Fig. 3 is a partially enlarged view of the battery cell 1 according to the first embodiment of the present disclosure.
As shown in fig. 1 to 3, the battery cell 1 is formed by sequentially stacking and winding a first pole piece 20, a separator (not shown), and a second pole piece (not shown). Typically, the battery cell 1 is a square winding core. In a plane (i.e., a lateral plane shown in fig. 1) perpendicular to and on one side of the winding surface of the battery cell 1, the battery cell 1 has a winding center portion 10, a first straight portion 11, and a second straight portion 12, wherein the winding center portion 10 extends in the cell length direction, and the first straight portion 11 and the second straight portion 12 are located on both sides of the winding center portion 10 in the width direction perpendicular to the length direction. For convenience of illustration, the battery cell 1 is placed with the winding surface vertical, and a tab to be described below is provided on the upper side of the battery cell 1, which is not limited herein.
One side (i.e., upper side) of the first pole piece 20 is electrically connected with a plurality of first pole tabs (21. The plurality of first tabs are divided into a first group of first tabs 21 and a second group of first tabs 22. After winding, the first group of first tabs 21 are distributed in the first rectilinear portions 11, and the second group of first tabs 22 are distributed in the second rectilinear portions 12. The first group of first tabs 21 overlap in the width direction to form a first sub-electrode 24. The first group of first tabs 22 overlap in the width direction to form a first sub-electrode 25.
The first sub-electrodes 24 and the first sub-electrodes 25 are spaced apart in the length direction. The length of the first group of first tabs 21 in the length direction is d 1 The length of the second group of the first tab 22 in the length direction is d 2 The center-to-center distance d between the first sub-electrode 24 and the first sub-electrode 25 is greater than or equal to 1/2 (d) 1 +d 2 ). In other words, the center-to-center distance between the first sub-electrode 24 and the first sub-electrode 25 in the length direction is greater than or equal to the length d of the first group of first tabs 21 constituting the first sub-electrode 24 1 And a length d in the length direction of the first group of first tabs 22 constituting the first sub-electrodes 25 2 Average value of (a). The lengths of the first pole lugs in the same group in the length direction are equal.
The first sub-electrode 24 and the first sub-electrode 25 together form a first electrode 27 of the first pole piece 20. The first sub-electrode 24 and the first sub-electrode 25 are electrically connected after soldering to form a first electrode 27.
One side (i.e., the upper side) of the second pole piece is electrically connected with a plurality of second tabs. The plurality of second tabs are divided into a first group of second tabs and a second group of second tabs. After winding, the first set of second pole ears is distributed in the first linear portion 11 and the second set of second pole ears is distributed in the second linear portion 12. The first group of second tabs overlap in the width direction to form a second sub-electrode 34. The first group of second tabs are overlapped in the width direction to form the second sub-electrode 35.
The second sub-electrode 34 and the second sub-electrode 35 are spaced apart in the length direction. The length of the first group of second tabs in the length direction is d 3 The length of the second group of second pole lugs in the length direction is d 4 The center-to-center distance d between the second sub-electrode 34 and the second sub-electrode 35 b Has a dimension of d b ≥1/2*(d 3 +d 4 ). In other words, the center-to-center distance d in the length direction of the second sub-electrode 34 and the second sub-electrode 35 b Is greater than or equal to the length d of the first group of second tabs constituting the second sub-electrode 34 3 And a length d in the length direction of a first group of second tabs constituting the second sub-electrode 35 4 Average value of (a). The lengths of the second pole lugs in the same group in the length direction are equal。
The second sub-electrode 34 and the second sub-electrode 35 together form a second electrode 37 of the second pole piece. The second sub-electrode 34 and the second sub-electrode 35 are electrically connected after soldering to form a second electrode 37.
Although in the first embodiment, as shown in fig. 2, the first tabs 21 and 22 on the first pole piece 20 are alternately arranged, the first tabs on the first pole piece 20 may be arranged in other ways to obtain the arrangement of the first sub-electrodes 24 and the first sub-electrodes 25 shown in fig. 1 and 3, which is not limited herein.
It should be noted that although the configuration of the second electrode in the first embodiment is similar to that of the first electrode in the first embodiment, the configuration of the second electrode in the second embodiment or the third embodiment may also be used in cooperation with that of the first electrode in the first embodiment, or the second electrode provided in the existing electrode structure may also be used in cooperation with that of the first electrode in the first embodiment, which is not limited herein. Similarly, the second electrodes in the second embodiment and the third embodiment are also applicable to the above description, and are not described in detail later.
Second embodiment
Fig. 4 to 6 show schematic diagrams of cells according to a second embodiment of the present disclosure. The difference from the first embodiment is that in the second embodiment, the projections of the first sub-electrode 124 and the first sub-electrode 125 on a plane perpendicular to the length direction may at least partially coincide. In other words, the first sub-electrodes 124 and 125 have aligned portions when viewed in the length direction. Likewise, the projections of the second sub-electrode 134 and the second sub-electrode 135 on the plane perpendicular to the length direction may at least partially coincide.
Specifically, the first sub-electrode 124 and the first sub-electrode 125 each include a first tab distributed on the first and second straight parts 111 and 112. At least one of the rectilinear winding surfaces includes both the first tab 121 and the first tab 122. Therefore, the projections of the first sub-electrode 124 and the first sub-electrode 125 on the plane perpendicular to the length direction may at least partially coincide (there are the first tab 121 and the first tab 122 located on the same line). More specifically, the number of the first tabs 121 located at the first rectilinear portion 111 is greater than the number of the first tabs 121 located at the second rectilinear portion 112, and the number of the first tabs 122 located at the second rectilinear portion 112 is greater than the number of the first tabs 122 located at the first rectilinear portion 111. It is noted that there are other ways of distributing the first tab between the first rectilinear portion 111 and the second rectilinear portion 112, and the second embodiment is merely an example in which the space can be more fully utilized.
It should be noted that the projections of the first sub-electrode 124 and the first sub-electrode 125 on the plane perpendicular to the length direction may also completely coincide. In other words, the straight winding surface of each first tab 121 also includes a first tab 122, and vice versa.
Although in the second embodiment, as shown in fig. 5, the paired first tabs 121 and the paired first tabs 122 on the first pole piece 120 are alternately arranged (since the first tabs in the second embodiment are single, there is only a single first tab 121 on the leftmost side of fig. 4), the first tabs on the first pole piece 120 may be arranged in other ways to obtain the arrangement of the first sub-electrodes 124 and the first sub-electrodes 125 shown in fig. 4 and fig. 6, which is not limited herein.
Third embodiment
Fig. 7 to 9 show schematic diagrams of cells according to a third embodiment of the present disclosure. The difference from the second embodiment is that in the third embodiment, the first tabs are divided into three groups, that is, a first group first tab 221, a second group first tab 222, and a third group first tab 223 (the second tabs are also divided into three groups in the same way).
Specifically, the first group first tabs 221 are overlapped with each other in the width direction to form first sub-electrodes 224, the second group first tabs 222 are overlapped with each other in the width direction to form first sub-electrodes 225, and the third group first tabs 223 are overlapped with each other in the width direction to form first sub-electrodes 226. The first sub-electrode 224, the first sub-electrode 225 and the first sub-electrode 226 together form a first electrode 227 of the first pole piece 220.
In the third embodiment, the first sub-electrodes 224 and 225 and the first sub-electrodes 225 and 226 have center-to-center distances d and d' in the length direction, respectively. The center-to-center distance d between the first sub-electrode 224 and the first sub-electrode 225 in the longitudinal direction may be the same as or different from the center-to-center distance d' between the first sub-electrode 225 and the first sub-electrode 226 in the longitudinal direction.
Although the first sub-electrode 224 and the first sub-electrode 226 are completely overlapped and the first sub-electrode 225 is partially overlapped with the first sub-electrode 224 and the first sub-electrode 226 respectively in a projection on a plane perpendicular to the length direction, the first sub-electrode 224, the first sub-electrode 225 and the first sub-electrode 226 may be completely overlapped, completely misaligned or partially overlapped, and the like, which is not limited herein. More specifically, the number of the first tabs 221 located in the first linear portion 211 is greater than the number of the first tabs 221 located in the second linear portion 212, the number of the first tabs 222 located in the second linear portion 212 is greater than the number of the first tabs 222 located in the first linear portion 211, and the number of the first tabs 223 located in the first linear portion 211 is greater than the number of the first tabs 223 located in the second linear portion 212.
Although the present disclosure shows only the features of the first pole piece in detail, alternatively, all the features of the second pole piece may be provided in terms of the first pole piece.
The reader should understand that in the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and actual implementations may have additional divisions, for example, multiple features may be combined or integrated into another embodiment, or some features may be omitted.
While the present disclosure has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (10)
1. A battery cell, which is characterized in that,
the battery cell is formed by sequentially laminating and winding a first pole piece, a diaphragm and a second pole piece, and the battery cell is provided with a winding central part extending along the length direction and a first straight line part and a second straight line part which are positioned at two sides of the winding central part in the width direction perpendicular to the length direction in a plane perpendicular to the winding surface of the battery cell and positioned at one side of the winding surface,
one side of the first pole piece is electrically connected with a plurality of first pole lugs, the first pole lugs are distributed on the first straight line part and the second straight line part after being wound, the first pole lugs are divided into a plurality of groups,
the first tabs of the same group are overlapped in the width direction so that the first tabs of a plurality of groups respectively form a plurality of first sub-electrodes according to grouping,
two adjacent first sub-electrodes of the plurality of first sub-electrodes have a spacing in the length direction, and
the plurality of first sub-electrodes collectively form a first electrode of the first pole.
2. The cell of claim 1, wherein,
the plurality of first sub-unitsThe center-to-center distance between two adjacent first sub-electrodes in the electrode in the length direction is d more than or equal to 1/2 (d) i +d i+1 ) In which d is i The maximum length of the first tab in the length direction is the ith group.
3. The electrical core of claim 1,
projections of the plurality of first sub-electrodes on a plane perpendicular to the length direction at least partially coincide.
4. The cell of claim 1, wherein,
the plurality of first tabs are divided into two or three groups to form two or three first sub-electrodes.
5. The cell of claim 1, wherein,
one side of the second pole piece is electrically connected with a plurality of second pole lugs, the second pole lugs are distributed on the first straight line part and the second straight line part after being wound, the second pole lugs are divided into a plurality of groups,
the second tabs of the same group are overlapped in the width direction such that the first tabs of a plurality of groups form a plurality of second sub-electrodes according to grouping,
two adjacent ones of the plurality of second sub-electrodes have a spacing in the length direction, and
the plurality of second sub-electrodes collectively form a second electrode of the second pole piece.
6. The cell of claim 1, wherein,
the first pole lug of the first pole piece and the second pole lug of the second pole piece are arranged on the same side or the opposite side of the battery cell.
7. The cell of claim 1, wherein,
the lengths of the first tabs of the same group in the length direction are equal or different, and/or the lengths of the first tabs of different groups in the length direction are equal or different.
8. The electrical core of claim 1,
the distance between two adjacent first sub-electrodes in the plurality of first sub-electrodes in the length direction is the same or different.
9. The cell of claim 1, wherein,
the number of the first tabs located in the first linear portion may be the same as or different from the number of the first tabs located in the second linear portion.
10. A battery comprising one or more cells according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222728094.7U CN218769987U (en) | 2022-10-17 | 2022-10-17 | Battery core and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222728094.7U CN218769987U (en) | 2022-10-17 | 2022-10-17 | Battery core and battery |
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| Publication Number | Publication Date |
|---|---|
| CN218769987U true CN218769987U (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222728094.7U Active CN218769987U (en) | 2022-10-17 | 2022-10-17 | Battery core and battery |
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| CN (1) | CN218769987U (en) |
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- 2022-10-17 CN CN202222728094.7U patent/CN218769987U/en active Active
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