CN213782066U - Battery cell, battery and device using battery - Google Patents
Battery cell, battery and device using battery Download PDFInfo
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- CN213782066U CN213782066U CN202022479710.0U CN202022479710U CN213782066U CN 213782066 U CN213782066 U CN 213782066U CN 202022479710 U CN202022479710 U CN 202022479710U CN 213782066 U CN213782066 U CN 213782066U
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The embodiment of the application provides a single battery, a battery and a device using the battery, and belongs to the field of batteries. The shell comprises a first plate body, a second plate body and a third plate body which are not coplanar, the third plate body forms an arc-shaped corner between the first plate body and the second plate body, a plurality of positive plates and negative plates in the electrode assembly are divided into a first part and a second part, the first part is arranged opposite to the first plate body, the second part is arranged opposite to the third plate body, the size of the positive plates in the first part along the second direction is larger than that of the positive plates in the second part along the second direction, and the size of the negative plates in the first part along the second direction is larger than that of the negative plates in the second part along the second direction. Therefore, the end parts of the positive plate and the negative plate in the arc-shaped corner area cannot rub or collide with the shell wall in the arc-shaped corner area, damage to the positive plate and the negative plate by the shell wall in the arc-shaped corner area is avoided, and the use safety of the battery is improved.
Description
Technical Field
The embodiment of the application relates to the field of batteries, in particular to a battery monomer, a battery and a device using the battery.
Background
The lithium ion battery has the advantages of light weight, small volume, high energy density, good safety performance and the like, and is widely applied to some electronic equipment, electric vehicles, electric toys and electric equipment. Lithium ion batteries include wound lithium batteries and laminated lithium batteries, among which, laminated lithium batteries are widely used because of their superior overall performance.
Currently, a plurality of positive electrode sheets, a separator and a plurality of negative electrode sheets are stacked to form an electrode assembly, and then external terminals are connected to be put into a case to form a laminated lithium battery. The positive electrode sheets have the same size, the separators have the same size, and the negative electrode sheets have the same size.
However, there is an arc-shaped corner (also called as R-corner) when the case is formed, and when the electrode assembly is placed in the case, due to the R-corner of the case, the electrode pieces in the electrode assembly are pressed, which causes problems such as material dropping and crumpling, and affects the safe use of the battery.
Disclosure of Invention
In view of the above, embodiments of the present application provide a battery cell, a battery and a device using the battery, which overcome or at least partially solve the above problems.
According to a first aspect of the embodiments of the present application, there is provided a battery cell, a battery and a device using the battery, including:
an electrode assembly including a plurality of positive electrode tabs and a plurality of negative electrode tabs stacked in a first direction;
the shell is made of metal and comprises a first plate body, a second plate body and a third plate body, wherein the first plate body is parallel to the first direction, the second plate body is parallel to the second direction, the side end of the third plate body is connected with the side ends of the first plate body and the second plate body, the first plate body and the second plate body are intersected with the third plate body, and the first direction is vertical to the second direction;
the plurality of positive electrode tabs and the plurality of negative electrode tabs in the electrode assembly are divided into a first portion and a second portion along the first direction, the first portion is arranged opposite to the first plate body, the second portion is arranged opposite to the third plate body, the size of the positive electrode tabs in the first portion along the second direction is larger than the size of the positive electrode tabs in the second portion along the second direction, and the size of the negative electrode tabs in the first portion along the second direction is larger than the size of the negative electrode tabs in the second portion along the second direction.
Optionally, the number of the first plate body and the second plate body is 2, the number of the third plate body is 4, and the side end of each third plate body is connected to the side end of the first plate body and the side end of the second plate body adjacent to the third plate body.
Optionally, the sum of the number of positive electrode tabs and negative electrode tabs in the second portion is greater than or equal to 2 and less than or equal to the first threshold.
Optionally, when the number of positive electrode tabs in the second portion is greater than or equal to 2, the size of the positive electrode tabs in the second portion in the second direction is the same;
when the number of the negative electrode sheets in the second portion is greater than or equal to 2, the sizes of the negative electrode sheets in the second direction in the second portion are the same.
Optionally, when the number of the positive electrode tabs in the second portion is greater than or equal to 2, the size of the positive electrode tabs in the second portion gradually increases from the outer side to the inner side along the second direction;
when the number of the negative electrode plates in the second portion is greater than or equal to 2, the negative electrode plates in the second portion gradually increase in size from an outer side to an inner side along the second direction, wherein the outer side refers to a side close to the second plate body, and the inner side refers to a side far from the second plate body.
Optionally, the size of the positive electrode tab in the second direction is smaller than the size of two adjacent negative electrode tabs in the second direction.
Optionally, the case further includes a fourth plate, and bottom ends of the first plate, the second plate and the third plate are connected to the fourth plate, and form a cavity for accommodating the electrode assembly.
According to a second aspect of the embodiments of the present application, there is provided a battery including the battery cell of the first aspect.
Optionally, a plurality of the battery cells are connected in series, in parallel or in series-parallel.
According to a fourth aspect of embodiments of the present application, there is provided an apparatus using a battery, the apparatus comprising the battery according to the third aspect, wherein the battery is used for supplying electric energy.
In this application embodiment, the side of first plate body and second plate body is connected to the side of third plate body, and first plate body and second plate body all intersect with the third plate body, and like this, the arc turning between the lateral wall that the third plate body formed the casing between first plate body and second plate body and lateral wall. Then, the plurality of positive electrode tabs and the plurality of negative electrode tabs in the electrode assembly are divided into a first portion and a second portion in the first direction, the size of the positive electrode tabs in the first portion in the second direction is greater than the size of the positive electrode tabs in the second portion in the second direction, and the size of the negative electrode tabs in the first portion in the second direction is greater than the size of the negative electrode tabs in the second portion in the second direction. That is, the dimension of the positive electrode tab in the arc-shaped corner region between the side wall of the case and the side wall in the second direction is set shorter than the dimension of the positive electrode tab in the non-arc-shaped corner region in the second direction, and the dimension of the negative electrode tab in the arc-shaped corner region in the second direction is set shorter than the dimension of the negative electrode tab in the non-arc-shaped corner region in the second direction. Therefore, the ends of the positive plate and the negative plate in the arc-shaped corner region cannot rub or collide with the housing wall in the arc-shaped corner region, so that the damage of the housing wall in the arc-shaped corner region to the positive plate and the negative plate in the electrode assembly can be effectively avoided, and the use safety of the battery is improved.
The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and the embodiments of the present application can be implemented according to the content of the description in order to make the technical means of the embodiments of the present application more clearly understood, and the detailed description of the present application is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present application more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another battery cell provided in an embodiment of the present application;
FIG. 3 is a schematic structural view of the battery cell shown in FIG. 1 at section A-A;
FIG. 4 is a schematic structural view of the battery cell shown in FIG. 2 at section A-A;
FIG. 5 is a schematic structural view of the battery cell shown in FIG. 1 at a section B-B;
fig. 6 is a schematic structural view of the battery cell shown in fig. 2 at a section B-B.
Reference numerals:
100: battery cell, 01: end cap assembly, 011: end cap, 012: terminal, 013: adaptor sheet, 02: electrode assembly, 03: shell, 021: positive electrode tab, 022: negative electrode tab, 023: positive plate, 024: negative electrode tab, 031: first plate body, 032: second plate, 033: third plate body, 034: fourth plate, 035: a fifth plate body, X: first direction, Y: second direction, Z: vertical direction, 02 a: first part, 02 b: a second portion.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
The terms "comprising" and "having," and any variations thereof, in the description and claims of this application and the description of the drawings are intended to cover, but not to exclude, other elements. The word "a" or "an" does not exclude a plurality.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The following description is given with the directional terms in the drawings, and is not intended to limit the specific structure of the battery cell, the battery, and the device using the battery in the present application. For example, in the description of the present application, the terms "first direction", "second direction", "vertical direction", "lateral end", "bottom end", "inside", "outside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Further, expressions of directions indicated for explaining the operation and configuration of each member of the battery cell, the battery and the device using the battery of the present embodiment, such as the first direction, the second direction and the vertical direction, are not absolute but relative, and although these indications are appropriate when each member of the battery pack is in the position shown in the drawings, when the position is changed, the directions should be interpreted differently to correspond to the change.
Furthermore, the terms "first," "second," and the like in the description and claims of the present application or in the above-described drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, and may explicitly or implicitly include one or more of the features.
In the description of the present application, unless otherwise specified, "plurality" means two or more (including two), and similarly, "plural groups" means two or more (including two).
In the description of the present application, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., "connected" or "connected" of a mechanical structure may refer to a physical connection, e.g., a physical connection may be a fixed connection, e.g., a fixed connection by a fastener, such as a screw, bolt, or other fastener; the physical connection can also be a detachable connection, such as a mutual clamping or clamping connection; the physical connection may also be an integral connection, for example, a connection made by welding, gluing or integrally forming the connection. "connected" or "connected" of circuit structures may mean not only physically connected but also electrically connected or signal-connected, for example, directly connected, i.e., physically connected, or indirectly connected through at least one intervening component, as long as the circuits are in communication, or communication between the interiors of two components; signal connection may refer to signal connection through a medium, such as radio waves, in addition to signal connection through circuitry. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Before introducing the battery cell, the battery and the device using the battery provided by the embodiment of the application, the structure of the battery is briefly introduced.
Fig. 1 and 2 are schematic structural diagrams of a battery cell provided in an embodiment of the present disclosure, and as shown in fig. 1 and 2, a battery cell 100 includes an end cap assembly 01, an electrode assembly 02 and a case 03, the electrode assembly 02 is located in the case 03, the end cap assembly 01 is used for sealing an opening of the case 03, and the sealed case 03 is filled with an electrolyte.
As shown in fig. 1 and 2, the end cap assembly 01 includes an end cap 011 and two terminals 012, the end cap 011 is substantially in a flat plate shape, the two terminals 012 are located on and penetrate through a flat plate surface of the end cap 011, the two terminals 012 are respectively a positive terminal 012 and a negative terminal 012, each terminal 012 is correspondingly provided with an adaptor sheet 013, and the adaptor sheet 013 is located between the end cap 011 and the electrode assembly 02.
The electrode assembly 02 has a positive electrode tab 021 and a negative electrode tab 022, the positive electrode tab 021 of the electrode assembly 0210 is connected to the positive electrode terminal 012 by one adaptor sheet 013, and the negative electrode tab 022 is connected to the negative electrode terminal 012 by another adaptor sheet 013.
The number of the electrode assemblies 02 in the battery cell 100 may be set to be single or plural according to actual use requirements.
The battery cell, the battery and the device using the battery provided by the embodiment of the application are clearly and completely described below with reference to the attached drawings.
As shown in fig. 1 to 6, in this battery cell 100, the electrode assembly 02 includes a plurality of positive electrode tabs 023 and a plurality of negative electrode tabs 024 which are arranged in layers in the first direction X.
The plurality of positive electrode tabs 023 and the plurality of negative electrode tabs 024 in the electrode assembly 02 are divided into a first part 02a and a second part 02b in the first direction X, the first part 02a is disposed opposite to the first plate body 031, the second part 02b is disposed opposite to the third plate body 033, the size of the positive electrode tab 023 in the first part 02a in the second direction Y is larger than the size of the positive electrode tab 023 in the second part 02b in the second direction Y, and the size of the negative electrode tab 024 in the first part 02a in the second direction Y is larger than the size of the negative electrode tab 024 in the second part 02b in the second direction Y.
The housing 03 may be a cube. The quantity of first plate body 031 is 2, and the position of these two first plate bodies 031 is relative, and the quantity of second plate body 032 also is 2, and the position of these two second plate bodies 032 is relative, and the quantity of third plate body 033 is 4, and first plate body 031, second plate body 032 and third plate body 033 are the lateral wall of casing 03, forms the whole lateral wall of casing 03 after the side of the side connection of every third plate body 033 rather than adjacent first plate body 031 and second plate body 032.
When the third plate body 033 is connected to the first plate body 031 and the second plate body 032, two opposite side ends of the first third plate body 033 may be respectively connected to a first side end of the first plate body 031 adjacent to the first side end of the first second plate body 032, two opposite side ends of the second third plate body 033 may be respectively connected to a second side end of the first second plate body 032 adjacent to the second third plate body 033 and a first side end of the second first plate body 031 adjacent to the second plate body 032, two opposite side ends of the third plate body 033 may be respectively connected to a second side end of the second first plate body 031 adjacent to the third plate body 032 and a first side end of the second plate body 031 adjacent to the third plate body 033, and two opposite side ends of the fourth third plate body 033 may be respectively connected to a second side end of the second plate body 032 adjacent to the second side end of the first plate body 031 adjacent to the second plate body 032. A first side end of the first plate 031 is opposite to a second side end of the first plate 031, a first side end of the second first plate 031 is opposite to a second side end of the second first plate 031, a first side end of the first second plate 032 is opposite to a second side end of the first second plate 032, and a first side end of the second plate 032 is opposite to a second side end of the second plate 032.
The third plate 033 may be a flat plate or a curved plate. The third plate body 033 is not coplanar with the first plate body 031, nor coplanar with the second plate body 032, and when the third plate body 033 is flat, the adjacent first plate body 031 and second plate body 032 can have an included angle of any degree with the third plate body 033. When the third plate 033 is a curved plate, the curvature of the plate surface of the third plate 033 may be arbitrarily positive. When the side end of the third plate body 033 is connected to the side ends of the first plate body 031 and the second plate body 032, the third plate body 033 may form an arc-shaped corner between the side wall and the side wall of the housing 03 between the first plate body 031 and the second plate body 032, and the number of the arc-shaped corners is 4.
The first direction X is a stacking direction of the positive electrode sheet 023 and the negative electrode sheet 024, and the second direction Y is perpendicular to the first direction X, and as shown in fig. 3 and 4, the first plate 031 is parallel to the first direction X, and the second plate 032 is parallel to the second direction Y. The first portion 02a of the electrode assembly 02 divided in the first direction X is disposed opposite to the first plate 031 in the sense that the ends of the positive and negative electrode tabs 023 and 024 in the first portion 02a are closest to the first plate 031, and the second portion 02b of the electrode assembly 02 divided in the first direction X is disposed opposite to the third plate 033 in the sense that the ends of the positive and negative electrode tabs 023 and 024 in the second portion 02b are closest to the third plate 033.
Further, in order to avoid the occurrence of the lithium deposition phenomenon, the size of the positive electrode tab 023 in the second direction Y may be smaller than the size of the two negative electrode tabs 024 adjacent thereto in the second direction Y. Specifically, the size of the positive electrode tab 023 in the first portion 02a in the second direction Y is smaller than the size of the two negative electrode tabs 024 adjacent thereto in the second direction Y, and the size of the positive electrode tab 023 in the second portion 02b in the second direction Y is smaller than the size of the two negative electrode tabs 024 adjacent thereto in the second direction Y.
In the embodiment of the present application, the size of the positive electrode tab 023 in the first part 02a in the second direction Y is larger than the size of the positive electrode tab 023 in the second part 02b in the second direction Y, and the size of the negative electrode tab 024 in the first part 02a in the second direction Y is larger than the size of the negative electrode tab 024 in the second part 02b in the second direction Y. That is, the dimension of the positive electrode tab 023 in the arc-shaped corner region between the side wall of the case 03 and the side wall in the second direction Y is set shorter than the dimension of the positive electrode tab 023 in the non-arc-shaped corner region in the second direction Y, and the dimension of the negative electrode tab 024 in the arc-shaped corner region in the second direction Y is set shorter than the dimension of the negative electrode tab 024 in the non-arc-shaped corner region in the second direction Y. Therefore, the ends of the positive plate 023 and the negative plate 024 in the arc-shaped corner region do not rub or collide with the wall of the shell 03 in the arc-shaped corner region, so that the damage of the wall of the shell 03 in the arc-shaped corner region to the positive plate 023 and the negative plate 024 in the electrode assembly 02 can be effectively avoided, and the use safety of the battery is improved.
In some embodiments, the housing 03 may further include a fourth plate 034, and bottom ends of the first plate 031, the second plate 032, and the third plate 033 are connected to the fourth plate 034, and form a cavity for accommodating the electrode assembly 02.
The fourth plate body 034 is a bottom wall of the housing 03, and a cavity for accommodating the electrode assembly 02 can be formed after the bottom ends of each of the first plate body 031, the second plate body 032 and the third plate body 033 are connected to the fourth plate body 034, and the cavity can be filled with electrolyte.
Optionally, the degree of shortening the size of the positive electrode tab 023 in the arc-shaped corner region along the second direction Y compared with the degree of shortening the size of the positive electrode tab 023 in the non-arc-shaped corner region along the second direction Y, and the degree of shortening the size of the negative electrode tab 024 in the arc-shaped corner region along the second direction Y compared with the size of the negative electrode tab 024 in the non-arc-shaped corner region along the second direction Y may be set according to the degree of the included angle between the adjacent first plate body 031 and the second plate body 032 and the third plate body 033, or the curvature of the plate surface of the third plate body 033.
For example, the dimension of the positive tab 023 of the arc-shaped corner region in the second direction Y may be shortened by 3mm (millimeters) compared to the dimension of the positive tab 023 of the non-arc-shaped corner region in the second direction Y, and the dimension of the negative tab 024 of the arc-shaped corner region in the second direction Y may be shortened by 2mm compared to the dimension of the negative tab 024 of the non-arc-shaped corner region in the second direction Y. The embodiment of the present application does not limit this.
In some embodiments, the sum of the number of positive and negative tabs 023 and 024 in the second portion 02b is greater than or equal to 2 and less than or equal to the first threshold. The first threshold may be any integer greater than 2, for example, the first threshold may be 3, 4, 5, and so on. Of course, in practical applications, in order to ensure the energy density and the battery performance of the battery, the value of the first threshold value may be set as small as possible, that is, the number of the positive electrode tabs 023 and the negative electrode tabs 024 in the second portion 02b may be set as small as possible.
In the first case, when the sum of the numbers of the positive electrode tabs 023 and the negative electrode tabs 024 in the second part 02b is equal to 2, the numbers of the positive electrode tabs 023 and the negative electrode tabs 024 in the second part 02b at this time are respectively 1, the size of the positive electrode tab 023 in the second direction Y is smaller than the size of the positive electrode tab 023 in the first part 02a in the second direction Y, and the size of the negative electrode tab 024 in the second direction Y is smaller than the size of the negative electrode tab 024 in the first part 02a in the second direction Y.
For example, when the plurality of positive electrode tabs 023 in the first portion 02a are equal in size in the second direction Y and are all 72mm, and the plurality of negative electrode tabs 024 in the first portion 02a are equal in size in the second direction Y and are all 80mm, the size of the positive electrode tab 023 in the second portion 02b in the second direction Y may be 65mm, and the size of the negative electrode tab 024 in the second portion 02b in the second direction Y may be 68 mm.
When positive electrode sheet 023 and negative electrode sheet 024 are laminated, there may be a case where positive electrode sheet 023 and negative electrode sheet 024 positive electrode sheet 023 … are laminated, there may be a case where positive electrode sheet 023 and negative electrode sheet 024 positive electrode sheet 023 … are laminated, there may be a case where positive electrode sheet 023 and negative electrode sheet 024 positive electrode sheet 023 … are laminated, when the sum of the numbers of the positive and negative electrode tabs 023 and 024 in the second portion 02b is greater than 2, there may be a number of positive electrode tabs 023 in the second portion 02b greater than or equal to 2, and the number of the negative electrode tabs 024 in the second portion 02b is less than 2, there may be cases where the number of the positive electrode tabs 023 in the second portion 02b is less than 2, while the number of the negative electrode tabs 024 in the second portion 02b is greater than or equal to 2, there may be a case where the number of the positive electrode tabs 023 and the negative electrode tabs 024 in the second portion 02b is both greater than or equal to 2.
In the second case, when the sum of the numbers of the positive electrode tabs 023 and the negative electrode tabs 024 in the second portion 02b is greater than 2, the number of the positive electrode tabs 023 in the second portion 02b is greater than or equal to 2, and the number of the negative electrode tabs 024 in the second portion 02b is less than 2, in the first manner, as shown in fig. 4, the sizes of the positive electrode tabs 023 in the second portion 02b in the second direction Y are the same.
For example, when the number of the positive electrode tabs 023 in the second part 02b is 3 and the number of the negative electrode tabs 024 in the second part 02b is 1, if the positive electrode tabs 023 in the first part 02a are equal and all 72mm in size in the second direction Y and the negative electrode tabs 024 in the first part 02a are equal and all 80mm in size in the second direction Y, the three positive electrode tabs 023 in the second part 02b may be equal and all 65mm in size in the second direction Y and the negative electrode tab 024 in the second part 02b may be 68mm in size in the second direction Y.
In the second mode, as shown in fig. 3, the positive electrode tab 023 in the second portion 02b gradually increases in size from the outside to the inside in the second direction Y. Here, the outer side refers to a side close to the second plate 032, and the inner side refers to a side far from the second plate 032. In this case, the size of the positive electrode sheet 023 in the second portion 02b may be increased from the outside to the inside in the second direction Y in the order of a fixed increase or may not be increased in the order of a fixed increase, as compared with the positive electrode sheet 023 in the first portion 02 a.
Continuing with the above example, the positive electrode tab 023 on the side of the second portion 02b near the second plate 032 is referred to as the first positive electrode tab, the positive electrode tab 023 in the second portion 02b near the first portion 02a is referred to as the third positive electrode tab, and the positive electrode tab 023 in the second portion 02b between the first positive electrode tab and the second positive electrode tab is referred to as the second positive electrode tab. In one mode, the sizes of the first positive electrode tab 023, the second positive electrode tab 023, the third positive electrode tab 023 and the first part 02a along the second direction Y can be 66mm, 68mm, 70mm and 72mm in sequence, and it can be seen that the sizes of the first positive electrode tab 023, the second positive electrode tab 023, the third positive electrode tab 023 and the first part 02a along the second direction Y increase in sequence by 2mm with fixed amplification. In another mode, the sizes of the first positive electrode tab 023, the second positive electrode tab 023, the third positive electrode tab 023 and the first portion 02a along the second direction Y may be 66mm, 67mm, 70mm and 72mm in sequence, and it can be seen that the sizes of the first positive electrode tab 023, the second positive electrode tab 023, the third positive electrode tab 023 and the first portion 02a along the second direction Y do not increase in sequence according to a fixed increase.
In the third case, when the sum of the numbers of the positive electrode tabs 023 and the negative electrode tabs 024 in the second portion 02b is greater than 2, the number of the negative electrode tabs 024 in the second portion 02b is greater than or equal to 2, and the number of the positive electrode tabs 023 in the second portion 02b is less than 2, in the first manner, as shown in fig. 4, the sizes of the negative electrode tabs 024 in the second portion 02b in the second direction Y are the same.
In the second manner, as shown in fig. 3, the negative electrode tabs 024 in the second portion 02b gradually increase in size from the outer side to the inner side in the second direction Y.
It should be noted that the third case can refer to the description of the second case, and will not be explained in detail here.
In the fourth case, when the number of the positive electrode tabs 023 and the negative electrode tabs 024 in the second portion 02b is both greater than or equal to 2, in the first manner, as shown in fig. 4, the size of the positive electrode tabs 023 in the second portion 02b in the second direction Y is the same, and the size of the negative electrode tabs 024 in the second portion 02b in the second direction Y is the same.
In the second mode, as shown in fig. 3, the positive electrode tab 023 in the second portion 02b gradually increases in size from the outside to the inside in the second direction Y, and the negative electrode tab 024 in the second portion 02b gradually increases in size from the outside to the inside in the second direction Y.
It should be noted that, in the fourth case, reference is made to the description of the second case, and the detailed explanation is omitted here.
In some embodiments, when the case 03 is subjected to the stretch forming, not only may curved corners be formed at the side walls and the side walls of the case 03 as described above, but also curved corners may be formed between the side walls and the bottom wall of the case 03, which may also rub or collide with the end portions of some of the positive and negative electrode tabs 023 and 024 in the electrode assembly 02, so that the positive and negative electrode tabs 023 and 024 are damaged, and the safe use of the battery is affected. Therefore, in order to avoid the above problems, as shown in fig. 5 and 6, the housing 03 may further include a fifth plate 035, a side end of the fifth plate 035 connects a bottom end of the second plate 032 and a side end of the fourth plate 034; the size of the positive electrode tab 023 in the first portion 02a in the vertical direction Z is larger than the size of the positive electrode tab 023 in the second portion 02b in the vertical direction Z, and the size of the negative electrode tab 024 in the first portion 02a in the vertical direction Z is larger than the size of the negative electrode tab 024 in the second portion 02b in the vertical direction Z.
It should be noted that the number of the fifth plate bodies 035 is 2, and the two fifth plate bodies 035 are opposite to each other, and the side end of each fifth plate body 035 is connected to the bottom end of the second plate 032 and the side end of the fourth plate body 034 adjacent to the fifth plate body.
When the fifth plate 035 is connected to the second plate 032 and the fourth plate 034, two opposite side ends of the first fifth plate 035 are respectively connected to the bottom end of the first second plate 032 and the first side end of the fourth plate 034 adjacent to the first second plate, and two opposite side ends of the second fifth plate 035 are respectively connected to the bottom end of the second plate 032 and the second side end of the fourth plate 034. The first side end of the fourth plate 034 is opposite to the second side end of the fourth plate 034.
The fifth plate 035 may be a flat plate or a curved plate. The fifth plate 035 is not coplanar with the second plate 032 or the fourth plate 034, and when the fifth plate 035 is a flat plate, the adjacent second plate 032 and the fourth plate 034 may have an included angle of any degree with the fifth plate 035. When the fifth plate 035 has a curved surface, the curvature of the surface of the fifth plate 035 can be any positive number. When the side end of the fifth plate 035 connects the bottom end of the second plate 032 and the side end of the fourth plate 034, the fifth plate 035 can form an arc-shaped corner between the bottom wall and the side wall of the housing 03 between the second plate 032 and the fourth plate 034, and the number of the arc-shaped corners is 2.
In the embodiment of the present application, the size of the positive electrode tab 023 in the first portion 02a in the vertical direction Z is larger than the size of the positive electrode tab 023 in the second portion 02b in the vertical direction Z, and the size of the negative electrode tab 024 in the first portion 02a in the vertical direction Z is larger than the size of the negative electrode tab 024 in the second portion 02b in the vertical direction Z. That is, the dimension of the positive electrode tab 023 in the arc-shaped corner region between the side wall and the bottom wall of the case 03 in the vertical direction Z is set shorter than the dimension of the positive electrode tab 023 in the non-arc-shaped corner region in the vertical direction Z, and the dimension of the negative electrode tab 024 in the arc-shaped corner region in the vertical direction Z is set shorter than the dimension of the negative electrode tab 024 in the non-arc-shaped corner region in the vertical direction Z. Therefore, the ends of the positive plate 023 and the negative plate 024 in the arc-shaped corner region do not rub or collide with the wall of the shell 03 in the arc-shaped corner region, so that the damage of the wall of the shell 03 in the arc-shaped corner region to the positive plate 023 and the negative plate 024 in the electrode assembly 02 can be effectively avoided, and the use safety of the battery is improved.
Optionally, the size of positive plate 023 along vertical direction Z in the arc corner region, the degree of shortening along vertical direction Z than positive plate 023 in the non-arc corner region, and the size of negative plate 024 along vertical direction Z in the arc corner region, the degree of shortening along vertical direction Z than negative plate 024 in the non-arc corner region, may all be according to the included angle degrees between adjacent second plate 032 and fourth plate 034 and fifth plate 035, or the face curvature of fifth plate 035.
In some embodiments, when the sum of the numbers of the positive electrode tabs 023 and the negative electrode tabs 024 in the second portion 02b is equal to 2, that is, the numbers of the positive electrode tabs 023 and the negative electrode tabs 024 in the second portion 02b are respectively 1, the size of this positive electrode tab 023 in the vertical direction Z is smaller than the size of the positive electrode tab 023 in the first portion 02a in the vertical direction Z, and the size of this negative electrode tab 024 in the vertical direction Z is smaller than the size of the negative electrode tab 024 in the first portion 02a in the vertical direction Z.
In some embodiments, when the sum of the numbers of the positive electrode tabs 023 and the negative electrode tabs 024 in the second portion 02b is greater than 2, the number of the positive electrode tabs 023 in the second portion 02b is greater than or equal to 2, and the number of the negative electrode tabs 024 in the second portion 02b is less than 2, in the first manner, as shown in fig. 6, the sizes of the positive electrode tabs 023 in the second portion 02b in the vertical direction Z are the same. In the second mode, as shown in fig. 5, the positive electrode tab 023 in the second portion 02b is gradually increased in size from the outside to the inside in the vertical direction Z. Here, the outer side refers to a side close to the second plate 032, and the inner side refers to a side far from the second plate 032. In this case, the size of the positive electrode tab 023 in the second portion 02b may be increased in a fixed increase or not in a fixed increase in order from the outer side to the inner side in the vertical direction Z as compared with the positive electrode tab 023 in the first portion 02 a.
In some embodiments, when the sum of the numbers of the positive electrode tabs 023 and the negative electrode tabs 024 in the second portion 02b is greater than 2, the number of the negative electrode tabs 024 in the second portion 02b is greater than or equal to 2, and the number of the positive electrode tabs 023 in the second portion 02b is less than 2, in the first manner, as shown in fig. 6, the sizes of the negative electrode tabs 024 in the second portion 02b in the vertical direction Z are the same.
In the second manner, as shown in fig. 5, the negative electrode tabs 024 in the second portion 02b gradually increase in size from the outer side to the inner side in the vertical direction Z.
In some embodiments, when the number of the positive electrode tabs 023 and the negative electrode tabs 024 in the second portion 02b is both greater than or equal to 2, in the first manner, as shown in fig. 6, the positive electrode tabs 023 in the second portion 02b are the same in size in the vertical direction Z, and the negative electrode tabs 024 in the second portion 02b are the same in size in the vertical direction Z.
In the second mode, as shown in fig. 5, the positive electrode tab 023 in the second portion 02b gradually increases in size from the outer side to the inner side in the vertical direction Z, and the negative electrode tab 024 in the second portion 02b gradually increases in size from the outer side to the inner side in the vertical direction Z.
In some embodiments, a battery is provided that includes the battery cell 100 described in the above embodiments. Wherein, the plurality of battery monomers are connected in series, in parallel or in series-parallel.
In some embodiments, a device using a battery is provided, the device comprising the battery of the previous embodiments, wherein the battery is used for providing electric energy.
In summary, the battery cell provided in the embodiments of the present application, the size of a positive plate 023 in an arc-shaped corner region between a side wall of a shell 03 and the side wall along a second direction Y is set shorter than the size of the positive plate 023 in a non-arc-shaped corner region along the second direction Y, the size of a negative plate 024 in the arc-shaped corner region along the second direction Y is set shorter than the size of the negative plate 024 in the non-arc-shaped corner region along the second direction Y, the size of the positive plate 023 in the arc-shaped corner region between the side wall and a bottom wall of the shell 03 along a vertical direction Z is set shorter than the size of the positive plate 023 in the non-arc-shaped corner region along the vertical direction Z, the size of the negative plate 024 in the arc-shaped corner region along the vertical direction Z is set shorter than the size of the negative plate 024 in the non-arc-shaped corner region along the vertical direction Z. Therefore, the ends of the positive electrode plate 023 and the negative electrode plate 024 in all arc-shaped corner regions in the shell 03 cannot rub or collide with the wall of the shell 03 in the arc-shaped corner regions, so that the damage of the wall of the shell 03 in the arc-shaped corner regions to the positive electrode plate 023 and the negative electrode plate 024 in the electrode assembly 02 can be effectively avoided, and the use safety of the battery is improved.
Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A battery cell, comprising:
an electrode assembly (02) including a plurality of positive electrode tabs (023) and a plurality of negative electrode tabs (024) which are arranged in a stack in a first direction (X);
the casing (03) is made of metal, the casing (03) comprises a first plate body (031), a second plate body (032) and a third plate body (033), the first plate body (031) is parallel to the first direction (X), the second plate body (032) is parallel to the second direction (Y), the side end of the third plate body (033) is connected with the side ends of the first plate body (031) and the second plate body (032), the first plate body (031) and the second plate body (032) are intersected with the third plate body (033), and the first direction (X) is perpendicular to the second direction (Y);
the plurality of positive electrode tabs (023) and the plurality of negative electrode tabs (024) in the electrode assembly (02) are divided into a first portion (02a) and a second portion (02b) in the first direction (X), the first portion (02a) is disposed opposite to the first plate body (031), the second portion (02b) is disposed opposite to the third plate body (033), a size of the positive electrode tab (023) in the first portion (02a) in the second direction (Y) is larger than a size of the positive electrode tab (023) in the second portion (02b) in the second direction (Y), and a size of the negative electrode tab (024) in the first portion (02a) in the second direction (Y) is larger than a size of the negative electrode tab (024) in the second portion (02b) in the second direction (Y).
2. The battery cell according to claim 1, wherein the number of the first plate body (031) and the second plate body (032) is 2, the number of the third plate bodies (033) is 4, and a side end of each third plate body (033) is connected to a side end of the first plate body (031) and the second plate body (032) adjacent to the third plate body.
3. The battery cell according to claim 1 or 2, characterized in that the sum of the number of positive pole tabs (023) and negative pole tabs (024) in the second portion (02b) is greater than or equal to 2 and less than or equal to a first threshold value.
4. The battery cell according to claim 3, characterized in that when the number of positive electrode tabs (023) in the second portion (02b) is greater than or equal to 2, the positive electrode tabs (023) in the second portion (02b) are the same size in the second direction (Y);
when the number of the negative electrode tabs (024) in the second portion (02b) is greater than or equal to 2, the size of the negative electrode tabs (024) in the second portion (02b) in the second direction (Y) is the same.
5. The battery cell according to claim 3, characterized in that when the number of positive electrode tabs (023) in the second portion (02b) is greater than or equal to 2, the positive electrode tabs (023) in the second portion (02b) increase in size gradually from the outside to the inside in the second direction (Y);
when the number of the negative electrode tabs (024) in the second portion (02b) is greater than or equal to 2, the negative electrode tabs (024) in the second portion (02b) gradually increase in size from an outer side, which refers to a side close to the second plate body (032), to an inner side, which refers to a side far from the second plate body (032), in the second direction (Y).
6. The battery cell according to claim 1, wherein the dimension of the positive electrode tab (023) in the second direction (Y) is smaller than the dimension of two of the negative electrode tabs (024) adjacent thereto in the second direction (Y).
7. The battery cell according to claim 1, wherein the housing (03) further comprises a fourth plate body (034), and bottom ends of the first plate body (031), the second plate body (032), and the third plate body (033) are connected to the fourth plate body (034) to form a cavity for accommodating the electrode assembly (02).
8. A battery comprising one or more cells according to any one of claims 1 to 7.
9. The battery of claim 8, wherein a plurality of the battery cells are connected in series, parallel, or series-parallel.
10. An apparatus for using a battery, the apparatus comprising: the battery of claim 8 or 9, wherein the battery is used to provide electrical energy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022479710.0U CN213782066U (en) | 2020-10-29 | 2020-10-29 | Battery cell, battery and device using battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022479710.0U CN213782066U (en) | 2020-10-29 | 2020-10-29 | Battery cell, battery and device using battery |
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| CN213782066U true CN213782066U (en) | 2021-07-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023050969A1 (en) * | 2021-09-29 | 2023-04-06 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electric apparatus |
| WO2024031348A1 (en) * | 2022-08-09 | 2024-02-15 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery, and electric device |
-
2020
- 2020-10-29 CN CN202022479710.0U patent/CN213782066U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023050969A1 (en) * | 2021-09-29 | 2023-04-06 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electric apparatus |
| WO2024031348A1 (en) * | 2022-08-09 | 2024-02-15 | 宁德时代新能源科技股份有限公司 | Electrode assembly, battery cell, battery, and electric device |
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