CN114300796A - Battery with a battery cell - Google Patents
Battery with a battery cell Download PDFInfo
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- CN114300796A CN114300796A CN202111653292.5A CN202111653292A CN114300796A CN 114300796 A CN114300796 A CN 114300796A CN 202111653292 A CN202111653292 A CN 202111653292A CN 114300796 A CN114300796 A CN 114300796A
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- 230000003247 decreasing effect Effects 0.000 claims 2
- 239000003792 electrolyte Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a battery, which relates to the technical field of energy equipment, and comprises a shell and a plurality of battery units arranged in the shell, wherein each battery unit comprises a plurality of battery cell units; the battery cells are sequentially connected in series, and the battery cell units in each battery cell are connected in parallel; or, a plurality of battery units are connected in parallel, and a plurality of battery cell units in each battery unit are connected in series in sequence. The battery can connect all the electric core units in parallel to enable the battery to have high current, then a plurality of battery units are connected in series to enable the battery to have high voltage, a single battery has high current and high power, and the single battery can be used in occasions with high power requirements.
Description
Technical Field
The invention relates to the technical field of energy equipment, in particular to a battery.
Background
The existing lithium ion battery is generally in a cylindrical structure or a square structure, wherein a winding core is directly arranged in a circular shell of the battery in the cylindrical structure, and the winding core or a laminated battery core is arranged in a square aluminum shell of the battery in the square structure to form the battery structure. The existing battery only has a circular winding core or a laminated battery core, the voltage is the voltage of the single winding core or the single laminated battery core, the power is lower, a plurality of batteries are generally formed into a battery module on the occasions with high power requirements, the module is complex to manufacture, and more materials are required to be used.
Disclosure of Invention
The present invention is directed to solving at least one of the above-described problems.
In order to solve the above problems, the present invention provides a battery, including a casing and a plurality of battery units disposed in the casing, where the battery unit includes a plurality of cell units; the battery units are sequentially connected in series, and the battery cell units in each battery unit are connected in parallel; or, a plurality of the battery units are connected in parallel, and a plurality of the battery cell units in each battery unit are sequentially connected in series.
Compared with the prior art, the battery provided by the invention has the following beneficial effects:
the battery of the invention only has a shell, a plurality of battery units are integrated in the shell, each battery unit comprises a plurality of battery cell units, each battery cell unit comprises a positive plate and a negative plate, all the positive plates and all the negative plates in the shell share electrolyte, each battery unit can connect the battery cell units in parallel to enable the battery to have high current, then the battery has high voltage by connecting the battery cells in series, the single battery has high current and high power, and can be used in occasions with high power requirements. In the case of having the function of a battery module, the use of a large amount of materials is also omitted, for example, each existing battery in the battery module is separately produced, and a separate case is required, and the battery of the present invention has a plurality of cell units arranged in one case, and shares the electrolyte in the case, so that a large amount of materials required for the preparation of the existing battery module are omitted.
Furthermore, a plurality of the battery cell units of the battery unit are sequentially arranged along a set direction, each battery cell unit comprises a positive plate, a first diaphragm, a negative plate and a second diaphragm which are sequentially arranged along the set direction, each battery cell unit is provided with a positive pole lug unit and a negative pole lug unit, and the battery further comprises a battery positive pole lug and a battery negative pole lug;
in each battery unit, the positive pole lug units of a plurality of battery cell units are connected in parallel to form a combined positive pole lug, and the negative pole lug units of a plurality of battery cell units are connected in parallel to form a combined negative pole lug;
it is a plurality of the battery unit passes through make up anodal utmost point ear with make up the negative pole utmost point ear and establish ties in proper order, it is a plurality of in the direction of series connection of battery unit, one end make up anodal utmost point ear do the anodal utmost point ear of battery, the other end make up the negative pole ear do the negative pole utmost point ear of battery.
Further, in each of the battery cells, the positive electrode tab unit is located at one end of the battery cell, and the negative electrode tab unit is located at the other end of the battery cell;
in two adjacent battery units, the positive electrode tab unit of one battery unit and the negative electrode tab unit of the other battery unit are located on the same side.
Furthermore, the heights of the battery units in the vertical direction are the same, and diaphragm gaps are reserved between every two adjacent battery units and between the battery units and the corresponding inner walls of the shell.
Further, a plurality of the battery units are distributed in the shell around the vertical center line of the shell, the set direction is a first direction parallel to the horizontal plane, the lengths of the positive plates in the battery units are sequentially reduced or increased along the set direction, and the lengths of the negative plates in the battery units are sequentially reduced or increased, wherein the lengths of the positive plates and the lengths of the negative plates are in a second direction parallel to the horizontal plane, and the second direction is perpendicular to the first direction.
Further, the length of the first diaphragm is larger than the lengths of the adjacent positive plate and the adjacent negative plate; the length of the second diaphragm is larger than the lengths of the adjacent positive plate and the adjacent negative plate.
Further, the plurality of battery units are distributed in the shell around the vertical center line of the shell, the set direction is the vertical direction, and the sizes of the plurality of positive plates and the plurality of negative plates in the battery units are the same.
Further, at least some of the battery units in the plurality of battery units are arranged side by side in sequence.
Further, a third separator is disposed at the separator gap between the adjacent battery cells.
Further, the battery cell unit comprises a positive plate, a first diaphragm, a negative plate and a second diaphragm which are sequentially arranged, and the positive plate, the first diaphragm, the negative plate and the second diaphragm are wound into the battery cell unit with a set shape.
Drawings
Fig. 1 is a first schematic structural diagram of connection of each cell unit and each battery unit in a battery according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of connection between each battery cell unit and each battery unit in the battery according to the embodiment of the present invention;
fig. 3 is a third schematic structural diagram of connection between each battery cell unit and each battery unit in the battery according to the embodiment of the present invention;
fig. 4 is a schematic top cross-sectional view of a first cell distribution of a battery of an embodiment of the invention;
fig. 5 is a schematic front sectional view of a cell unit of a battery according to an embodiment of the present invention;
fig. 6 is a schematic top cross-sectional view of a second cell distribution of a battery of an embodiment of the invention;
fig. 7 is a schematic top cross-sectional view of a third cell distribution of a battery of an embodiment of the invention;
fig. 8 is a schematic top cross-sectional view of a fourth cell distribution of a battery according to an embodiment of the present invention.
Description of reference numerals:
1-battery unit, 11-battery cell unit, 111-positive plate, 1111-positive pole tab unit, 112-negative plate, 1121-negative pole tab unit, 113-first diaphragm, 114-second diaphragm, 2-third diaphragm, 3-shell, 4-parallel conductive piece, and 5-series conductive piece.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and 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 invention.
Also, in the drawings, the Z-axis represents a vertical, i.e., up-down position, and a positive direction of the Z-axis (i.e., an arrow direction of the Z-axis) represents up, and a negative direction of the Z-axis (i.e., a direction opposite to the positive direction of the Z-axis) represents down; in the drawings, the X-axis represents the longitudinal direction, i.e., the front-rear position, and the positive direction of the X-axis (i.e., the arrow direction of the X-axis) represents the front and the negative direction of the X-axis (i.e., the direction opposite to the positive direction of the X-axis) represents the rear; in the drawings, the Y-axis represents the lateral, i.e., left-right, position, and the positive direction of the Y-axis (i.e., the arrow direction of the Y-axis) represents the left, and the negative direction of the Y-axis (i.e., the direction opposite to the positive direction of the Y-axis) represents the right.
It should also be noted that the foregoing Z-axis, Y-axis, and X-axis are meant only to facilitate the description of the invention and to simplify the description, and are not meant to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.
Referring to fig. 1 to 4, a battery according to an embodiment of the present invention includes a housing 3 and a plurality of battery units 1 disposed in the housing, where each battery unit 1 includes a plurality of cell units 11; the battery units 1 are sequentially connected in series, and a plurality of battery cell units 11 in each battery unit are connected in parallel; alternatively, a plurality of battery units 1 are connected in parallel, and a plurality of battery cells 11 in each battery unit 1 are connected in series in sequence.
The battery of the embodiment only has one shell, a plurality of battery units 1 are integrated in the shell, each battery unit 1 further comprises a plurality of cell units 11, each cell unit 11 comprises a positive plate 111 and a negative plate 112, all the positive plates 111 and all the negative plates 112 in the shell 3 share electrolyte, in each battery unit 1, each cell unit 11 can be connected in parallel to enable the battery to have high current, then the plurality of battery units 1 are connected in series to enable the battery to have high voltage, the single battery has high current and high power, in some occasions with high power requirements, the single battery can be used as a PACK structure directly, a plurality of batteries are not required to be assembled into a battery module, and then the assembly process of the battery module is omitted, so that the cost is saved, secondly, compared with the existing battery module, the single battery of the embodiment also eliminates the use of a large amount of materials under the condition that the battery module can have the function of the battery module, for example, each existing battery in the battery module is separately produced and needs a separate housing, and the battery of the embodiment arranges a plurality of cell units 11 in one housing 3 and shares the electrolyte in the housing 3, thereby eliminating a large amount of materials needed by the preparation of the existing battery module.
Alternatively, referring to fig. 4 to 6, a plurality of the cell units of the battery unit are sequentially arranged along a set direction, and the cell unit 11 includes a positive electrode tab 111, a first separator 113, a negative electrode tab 112, and a second separator 114 that are sequentially arranged along the set direction.
Here, regarding a single battery unit 1, a plurality of battery units 11 included therein are sequentially arranged in a set direction, and pole pieces and separators in the battery units 11 are also arranged in the set direction, which is exemplarily illustrated in fig. 4, the battery shown in fig. 4 has four battery units 1, which is exemplarily illustrated in the battery unit 1 on the left, and all the positive pole pieces 111, the negative pole pieces 112, and the separators in the battery unit 1 are arranged in the following manner: from right to left, the positive electrode tab 111, the first separator 113, the negative electrode tab 112, the second separator 114, … …, the positive electrode tab 111, the first separator 113, the negative electrode tab 112, and the second separator 114 are arranged in such a manner that, for a single battery unit 1, the manufacturing process is simplified, and, with a significant distinction from other battery units 1, no confusion occurs when a plurality of battery cells 11 are connected in parallel and a plurality of battery cells 1 are connected in series in a single battery unit 1.
Optionally, referring to fig. 1 to 3, the cell unit is provided with a positive tab unit 1111 and a negative tab unit 1121, and the battery further includes a battery positive tab and a battery negative tab;
in each of the battery units 1, the positive electrode tab units 1111 of a plurality of the cell units 11 are connected in parallel to form a combined positive electrode tab, and the negative electrode tab units 1121 of a plurality of the cell units are connected in parallel to form a combined negative electrode tab;
it is a plurality of battery unit 1 passes through make up anodal utmost point ear with make up the negative pole utmost point ear and establish ties in proper order, it is a plurality of in battery unit 1's the direction of series connection, one end make up anodal utmost point ear do battery anodal utmost point ear, the other end make up the negative pole utmost point ear do battery negative pole utmost point ear.
Here, as shown in fig. 1, four battery units 1, which are sequentially referred to as a first battery unit, a second battery unit, a third battery unit and a fourth battery unit from top to bottom, each battery unit 1 has three cell units 11, the positive electrode tab units 1111 of the positive electrode sheets 111 in each battery unit 1 are connected in parallel by the parallel conductive member 4 to form a combined positive electrode tab, the negative electrode tab units 1121 of the negative electrode sheets 112 in each battery unit 1 are also connected in parallel by the parallel conductive member 4 to form a combined negative electrode tab, thereafter, the combined negative electrode tab of the first battery unit and the combined positive electrode tab of the second battery unit are connected by the series conductive member 5, the combined negative electrode tab of the second battery unit and the combined positive electrode tab of the third battery unit are connected by the series conductive member 5, the combined negative electrode tab of the third battery unit and the combined positive electrode tab of the fourth battery unit are connected by the series conductive member 5, and then realize the series connection of a plurality of battery units, so, the combination positive pole utmost point ear of first battery unit is as battery positive pole utmost point ear, and the combination negative pole utmost point ear of fourth battery unit is as battery negative pole utmost point ear.
Alternatively, in each of the battery cells 1, the positive electrode tab unit 1111 is located at one end of the battery cell 1, and the negative electrode tab unit 1121 is located at the other end of the battery cell 1;
in the adjacent two battery cells 1, the positive electrode tab unit 1111 of one battery cell 1 and the negative electrode tab unit 1121 of the other battery cell 1 are located on the same side.
Here, as shown in fig. 2, the positive electrode tab unit 1111 and the negative electrode tab unit 1121 may be located at the same side with respect to a single battery cell 1. As shown in fig. 3, the positive electrode tab unit 1111 and the negative electrode tab unit 1121 may be located on different sides with respect to a single battery unit 1, and the positive electrode tab unit 1111 of one battery unit 1 and the negative electrode tab unit 1121 of another battery unit 1 are located on the same side in two adjacent battery units 1, so that the length of the series-connection conductive member 5 and the space occupied in the case 3 may be reduced, and it may be more convenient to connect the battery units 1 in series.
In addition, as described above for the left battery cell in fig. 4, all the positive electrode tab 111, the negative electrode tab 112, and the separator in the left battery cell 1 are arranged in the following manner: from right to left, positive plate 111, first diaphragm 113, negative plate 112, second diaphragm 114, … …, positive plate 111, first diaphragm 113, negative plate 112, second diaphragm 114, so, this kind of arrangement can make the positive pole utmost point ear setting in adjacent electric core unit 11 more close, make the negative pole utmost point ear setting in adjacent electric core unit 11 also more close, reduce the use length of parallelly connected piece of conducting 4, also reduce the space in the casing 3 that parallelly connected piece of conducting 4 occupies.
Optionally, a direction from one side wall of the housing 3 to an opposite side wall is a vertical direction, cross-sectional shapes of the battery units 1 on any two horizontal planes are the same, and heights of the battery units 1 in the vertical direction are the same.
Here, the cross-sectional shapes of the battery cells 1 are the same in any two horizontal planes, that is, the top of each battery cell 1 extends to the top wall inside the case 3, and the bottom of each battery cell 1 extends to the bottom inside the case 3. Taking fig. 4 as an example, the positive electrode plates 111 and the negative electrode plates 112 are vertical, so that the top ends of each positive electrode plate 111 and each negative electrode plate 112 are flush, the top ends can all extend to the top wall in the housing 3, the bottom ends of each positive electrode plate 111 and each negative electrode plate 112 are flush, and the bottom ends can all extend to the bottom wall in the housing 3, so that the space utilization rate in the housing 3 is improved, and the energy density of the battery is improved.
Alternatively, referring to fig. 4, a plurality of battery units 1 are distributed in the housing 3 around a vertical center line of the housing 3, the set direction is a first direction parallel to a horizontal plane, lengths of the positive electrode tabs 111 in the battery units 1 decrease or increase in sequence along the set direction, and lengths of the negative electrode tabs 112 in the battery units 1 decrease or increase in sequence, wherein the lengths of the positive electrode tabs 111 and the lengths of the negative electrode tabs 112 are a second direction parallel to the horizontal plane, and the second direction is perpendicular to the first direction.
In the left battery unit 1 in fig. 4, the direction (first direction) is set as the Y-axis direction, the second direction (length direction of the pole piece) is set as the X-axis direction, the Y-axis direction is parallel to the horizontal plane, the X-axis is also parallel to the horizontal plane, and the X-axis and the Y-axis are perpendicular to each other.
Here, taking the left battery unit 1 in fig. 4 as an example, the cell unit 11 composed of the leftmost positive electrode tab 111, the negative electrode tab 112, the first separator 113, and the second separator 114 is a maximum-area cell unit, and the cell unit 11 composed of the rightmost positive electrode tab 111, the negative electrode tab 112, the first separator 113, and the second separator 114 is a minimum-area cell unit.
Alternatively, referring to fig. 4 and 7, the battery case 3 may include not only four battery units 1, but also five battery units 1, and specifically, depending on the shape of the case 3, if the case is a regular quadrilateral case, one battery unit 1 may be disposed on each of four sides, and if the case is a regular pentagonal case, one battery unit 1 may be disposed on each of five sides, and in each battery unit 1, the pole piece area of the maximum area cell unit 11 is similar to the area of one side wall on the circumferential side of the case.
Alternatively, referring to fig. 4, the length of the first separator 113 is greater than the length of the adjacent positive electrode tab 111, and the length of the first separator 113 is greater than the length of the adjacent negative electrode tab 112; the length of the second separator 114 is greater than the lengths of the adjacent positive electrode tab 111 and the adjacent negative electrode tab 112.
The length of the diaphragm is designed to be slightly longer than that of the adjacent pole pieces, so that the adjacent positive and negative pole pieces are prevented from contacting and short-circuiting, and meanwhile, the first diaphragm and the second diaphragm which are slightly longer than the adjacent pole pieces can prevent short-circuiting between the adjacent battery units 1 because the plurality of battery units 1 are annularly arranged.
Alternatively, referring to fig. 5, a plurality of battery units 1 are distributed in the housing 3 around a vertical center line of the housing 3, the set direction is a vertical direction, and the plurality of positive electrode tabs 111 and the plurality of negative electrode tabs 112 in the battery units 1 are all the same size.
Here, as shown in fig. 5, the pole pieces may also be stacked in a vertical direction, in which case, the positive pole piece 111 and the negative pole piece 112 have the same or similar size, so that when the single battery unit 1 has a larger power, the electrolyte in the common casing 3 is used, so that the current and the voltage of each battery cell 11 have the same consistency and the safety is high.
Alternatively, referring to fig. 8, at least some of the battery units 1 in the plurality of battery units 1 are arranged side by side in sequence.
Here, in the case of a rectangular case, three battery cells 1 are arranged in sequence in fig. 8, and the three battery cells 1 may be arranged in sequence in a manner consistent with the aforementioned setting direction, so that it is easier to connect the respective battery cells 1 in series.
Optionally, referring to fig. 6, the cell unit 11 includes a positive electrode tab 111, a first separator 113, a negative electrode tab 112, and a second separator 114, which are sequentially disposed, and the positive electrode tab 111, the first separator 113, the negative electrode tab 112, and the second separator 114 are wound into the cell unit 11 with a set shape.
Here, in a single cell unit 11, the pole pieces and the diaphragm may be arranged in a stacked manner, or may be in a winding manner, as shown in fig. 6, the left battery unit 1 has three cell units 11, the shapes of the wound cell units 11 match, each battery unit is in a predetermined shape as a whole, and may be in various structures such as a triangle, a rectangle, a trapezoid, or a polygon, a side surface shape of the cell unit 11 corresponding to the inner wall of the casing 3 is fitted to the inner wall of the casing 3, and the utilization rate of the internal space of the casing 3 is high.
Optionally, the shape of the plurality of battery units 1 on the same horizontal plane is the same, and diaphragm gaps are left between two adjacent battery units 1 and between the battery units 1 and the corresponding inner walls of the housing 3.
Here, a third separator 2 is disposed between the adjacent battery cells 1 at the separator gap, which can ensure that there is no short circuit between the adjacent battery cells 1.
Here, regardless of the shape of the battery cell 1, only a separator gap in which only one separator can be arranged is left between the battery cell 1 and the battery cell 1, and only a separator gap in which only one separator can be arranged is left between the battery cell 1 and the corresponding inner wall of the case 3, so that the utilization rate of the space in the case 3 is increased to the maximum possible extent, and the battery energy density is improved. The plurality of battery units 1 have the same shape in the horizontal plane, as shown in fig. 4, 6 and 7, each battery unit 1 has an isosceles trapezoid shape in the horizontal plane, and each isosceles trapezoid has the same size, as shown in fig. 8, each battery unit 1 has a rectangular shape in the horizontal plane, and the plurality of battery units 1 having the same cross-sectional shape can fill the space of the entire case 3 as much as possible.
The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A battery, characterized by comprising a case (3) and a plurality of battery cells (1) disposed within the case (3), the battery cells (1) comprising a plurality of cell units (11); the battery units (1) are sequentially connected in series, and the battery cell units (11) in each battery unit (1) are connected in parallel; or a plurality of battery units (1) are connected in parallel, and a plurality of battery cell units (11) in each battery unit (1) are connected in series in sequence.
2. The battery according to claim 1, wherein a plurality of the cell units (11) of the battery unit (1) are arranged in sequence along a set direction, the cell units (11) include a positive electrode tab (111), a first separator (113), a negative electrode tab (112), and a second separator (114) arranged in sequence along the set direction, the cell units are provided with a positive electrode tab unit (1111) and a negative electrode tab unit (1121), the battery further includes a battery positive electrode tab and a battery negative electrode tab;
in each battery unit (1), positive pole tab units (1111) of a plurality of battery cell units (11) are connected in parallel to form a combined positive pole tab, and negative pole tab units (1121) of the plurality of battery cell units are connected in parallel to form a combined negative pole tab;
a plurality of battery unit (1) passes through make up anodal utmost point ear with make up the negative pole utmost point ear and establish ties in proper order, and is a plurality of on the direction of series connection of battery unit (1), one end make up anodal utmost point ear do battery anodal utmost point ear, the other end make up the negative pole utmost point ear do battery negative pole utmost point ear.
3. The battery according to claim 2,
in each of the battery cells (1), the positive electrode tab unit (1111) is located at one end of the battery cell (1), and the negative electrode tab unit (1121) is located at the other end of the battery cell (1);
in the adjacent two battery cells (1), the positive electrode tab unit (1111) of one battery cell (1) and the negative electrode tab unit (1121) of the other battery cell (1) are located on the same side.
4. The battery according to claim 2, wherein the height of each of the plurality of battery cells (1) in the vertical direction is the same, and a separator gap is left between each two adjacent battery cells (1) and between each battery cell (1) and the corresponding inner wall of the case (3).
5. The battery according to claim 4, wherein a plurality of the battery cells (1) are distributed in the case (3) around a vertical center line of the case (3), the set direction is a first direction parallel to a horizontal plane, a plurality of the positive electrode tabs (111) in the battery cells (1) are sequentially decreased or increased in length along the set direction, and a plurality of the negative electrode tabs (112) in the battery cells (1) are sequentially decreased or increased in length, wherein the lengths of the positive electrode tabs (111) and the length directions of the negative electrode tabs (112) are a second direction parallel to the horizontal plane, and the second direction is perpendicular to the first direction.
6. The battery according to claim 5, wherein the length of the first separator (113) is greater than the lengths of the adjacent positive electrode tab (111) and the adjacent negative electrode tab (112); the length of the second separator (114) is greater than the lengths of the adjacent positive electrode sheet (111) and the adjacent negative electrode sheet (112).
7. The battery according to claim 4, wherein a plurality of the battery cells (1) are distributed in the case (3) around a vertical center line of the case (3), the set direction is a vertical direction, and the plurality of positive electrode tabs (111) and the plurality of negative electrode tabs (112) in the battery cells (1) are all the same size.
8. The battery according to claim 4, characterized in that at least some of the battery cells (1) of the plurality of battery cells (1) are arranged side by side in sequence.
9. The battery according to claim 4, characterized in that a third separator (2) is provided at the separator gap between adjacent battery cells (1).
10. The battery according to claim 1, wherein the cell unit (11) comprises a positive plate (111), a first diaphragm (113), a negative plate (112) and a second diaphragm (114) which are arranged in sequence, and the positive plate (111), the first diaphragm (113), the negative plate (112) and the second diaphragm (114) are wound into the cell unit (11) with a set shape.
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