CN219998293U - Battery cell, battery pack, electric automobile and energy storage system - Google Patents

Abstract

The embodiment of the application provides a battery cell, a battery pack, an electric automobile and an energy storage system, wherein the battery cell comprises: the device comprises at least two rows of core packages, a cover plate and a first shell, wherein each core package in the at least two rows of core packages comprises a pole piece and a pole lug, the pole lugs are arranged on the pole piece, the at least two rows of core packages are sequentially arranged along a first direction, and the first direction is parallel to a main plane of the pole piece and perpendicular to the stacking direction of the pole piece; the pole lugs adjacently arranged along the first direction in the at least two rows of core bags have the same polarity, and are fixedly connected through a first connecting sheet; at least two core bags are accommodated in the first shell, the first shell is fixedly connected with the cover plate, and the cover plate comprises a first pole, and the pole is fixedly connected with the first connecting piece. The battery cell provided by the embodiment of the application can effectively increase the capacity of the battery cell, thereby improving the storage capacity of the battery pack, the electric automobile and the energy storage system.

Description

Battery cell, battery pack, electric automobile and energy storage system

Technical Field

The embodiment of the application relates to the technical field of new energy, in particular to a battery cell, a battery pack, an electric automobile and an energy storage system.

Background

Along with the gradual vigorous development of energy storage markets, energy storage products are developed to a large capacity, and the large-capacity single battery can greatly improve the energy density of an energy storage system, reduce the manufacturing cost of the system and reduce the integration difficulty. In the prior art, the capacity of the battery cell or the battery core is usually improved by thickening the thickness of the single core package or widening the width of the single core package, but when the width or thickness of the battery core exceeds a certain size, the equipment structure is required to be redeveloped, so that the development and manufacturing cost of the battery core is greatly increased, and higher requirements are also put forward on the equipment compatibility of the current production line. Therefore, it is necessary to provide a cell structure to increase the capacity of the cell.

Disclosure of Invention

The embodiment of the application provides a battery cell, a battery pack, an electric automobile and an energy storage system, which can improve the capacity of the battery cell.

In a first aspect, an electrical core is provided, including at least two rows of core packages, a cover plate and a first housing, each core package in the at least two rows of core packages includes a pole piece and a pole ear, the pole ear is arranged on the pole piece, the at least two rows of core packages are sequentially arranged along a first direction, and the first direction is parallel to a main plane of the pole piece and perpendicular to a stacking direction of the pole piece; the polarities of the lugs of two adjacent core packages in the first direction are the same, and the lugs of two adjacent core packages in the first direction are fixedly connected through a first connecting sheet; the at least two rows of core bags are accommodated in the first shell, the cover plate is fixedly connected with the first shell, the cover plate comprises a first pole, and the first pole is fixedly connected with the first connecting piece.

In the embodiment provided by the application, at least two rows of core packages are arranged in parallel, the polarities of the lugs arranged adjacently of the two adjacent rows of core packages are the same and are fixedly connected through the first connecting sheet, so that the at least two rows of core packages are connected in parallel, the capacity of an electric core or a battery monomer is effectively increased, the width of the core package is not required to be widened or the thickness is not required to be thickened, and the improvement of the production cost caused by development and reconstruction of the existing production equipment is avoided. The first connecting piece is fixedly connected with the lugs with the same polarity, which are adjacently arranged along the first direction or the width direction, so that current can be collected on the first connecting piece, and the electric connection of the battery core, an external load and other components can be conveniently realized.

With reference to the first aspect, in certain implementation manners of the first aspect, the tabs of the two adjacent rows of core packages that are disposed adjacently along the first direction are connected to the same first pole through the first connection tab.

In the embodiment provided by the application, the tabs with the same polarity adjacently arranged along the first direction can share one pole, so that the number of the poles can be reduced, and the production cost of the battery core is reduced.

With reference to the first aspect, in some implementations of the first aspect, the polarities of the tabs of the two adjacent rows of core packages that are far away from each other along the first direction are the same, and the tabs of the two adjacent rows of core packages that are far away from each other along the first direction are fixedly connected with at least one second connecting piece respectively; the cover plate further comprises a second pole, and the second pole is fixedly connected with the at least one second connecting sheet.

In the embodiment provided by the application, the lugs which are far away from each other along the first direction are fixedly connected through the second connecting sheets respectively, so that current can be collected to the second connecting sheets, and the electric connection between the battery core and an external load and other components can be realized conveniently.

With reference to the first aspect, in certain implementation manners of the first aspect, each of the at least two rows of core packages includes a plurality of core packages, the plurality of core packages are sequentially arranged along a second direction, the second direction is parallel to a stacking direction of the pole pieces, polarities of tabs adjacently arranged along the second direction in the same row of core packages are the same, and the tabs adjacently arranged along a thickness direction of the core packages are fixedly connected through a third connecting sheet.

In the embodiment provided by the application, each column of core packages comprises a plurality of core packages, and the polarities of the lugs adjacently arranged in the second direction, namely the thickness direction of the core packages, in each column of core packages are the same, namely the positive lugs in the same column of core packages are adjacently arranged in the thickness direction of the core packages, and the negative lugs are also adjacently arranged in the thickness direction of the core packages, so that all the core packages in the same column of core packages are connected in parallel, and the capacity of an electric core can be increased. The tabs with the same polarity, which are adjacently arranged along the thickness direction of the core pack, are fixedly connected through the third connecting sheet, so that current can be collected on the third connecting sheet, and the battery core is electrically connected with components such as an external load.

With reference to the first aspect, in certain implementations of the first aspect, the third connecting piece is the same connecting piece as the first connecting piece or the second connecting piece.

In the embodiment provided by the application, the tabs with the same polarity of the same-column core package can share the connecting sheet, and the same-column core package and the core packages arranged in parallel can also share the connecting sheet, so that the number of the connecting sheets can be reduced, the processing procedure of the battery core is simplified, and the production cost of the battery core is reduced.

With reference to the first aspect, in certain implementations of the first aspect, the third connecting piece is fixedly connected with the first connecting piece or the second connecting piece.

In the embodiment provided by the application, the third connecting sheet is fixedly connected with the first connecting sheet or the second connecting sheet, so that the electric connection between the core packages in the same column and the core packages arranged in parallel can be realized; when every core package of being listed as includes a plurality of core packages, the adjacent utmost point ear that sets up of width direction along the core package of two adjacent core packages can be through third connection piece and first connection piece together with a first utmost point post fixed connection, and the adjacent utmost point ear that sets up can be through third connection piece and second connection piece together with a second utmost point post fixed connection along the width direction of core package of two adjacent core packages, thereby can further reduce the quantity of utmost point post, simplify the structure of electric core, reduce the manufacturing cost of electric core.

With reference to the first aspect, in certain implementations of the first aspect, the cover plate further includes a pressure relief mechanism.

In the embodiment provided by the application, the cover plate of the battery cell comprises the pressure relief mechanism, so that the air pressure in the battery cell can be balanced, and the explosion of the battery cell is prevented.

With reference to the first aspect, in certain implementations of the first aspect, a dimension of the cell in the first direction is less than or equal to 3000mm.

With reference to the first aspect, in certain implementation manners of the first aspect, a dimension of the battery cell in the second direction ranges from 8mm to 200mm.

With reference to the first aspect, in certain implementations of the first aspect, the battery cell is a lithium ion battery cell or a sodium ion battery cell.

In a second aspect, there is provided a battery pack comprising: one or more cells as described in the first aspect or any implementation of the first aspect, one or more of the cells being connected in series or in parallel; and a second housing in which one or more of the battery cells are housed.

In a third aspect, there is provided an electric vehicle comprising a battery pack and an on-board load according to any one of the second or second aspects, the battery pack being configured to supply power to the on-board load.

In a fourth aspect, an energy storage system is provided, which includes the battery pack according to the second aspect or any implementation manner of the second aspect, and a power converter, where the power converter is configured to perform power conversion on a voltage output by the battery pack and output the converted voltage to an electric network or an external load, and/or the power converter is configured to perform power conversion on a voltage output by an external power source and output the converted voltage to the battery pack.

Drawings

Fig. 1 is a schematic view of a core pack.

Fig. 2 is a schematic structural view of a core pack according to an embodiment of the present application.

Fig. 3 is a schematic structural view of a core pack according to an embodiment of the present application.

Fig. 4 is a schematic structural view of a core pack according to an embodiment of the present application.

Fig. 5 is a schematic structural view of a core pack according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a battery cell according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise.

In various embodiments of the application, first, second, etc. are merely intended to represent that the plurality of objects are different. Such as the first core pack and the second core pack, are only intended to represent different core packs. Without any effect on the core pack itself, the number, etc., and the first, second, etc. described above should not be construed as limiting the embodiments of the present application.

The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

In the embodiments of the present application, the number of nouns means "singular nouns or plural nouns", that is, "one or more", "plural" means two or more, unless otherwise specified. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein A, B may be singular or plural.

Fig. 1 is a schematic structural diagram of a core pack 200 according to an embodiment of the present application. Fig. 1 (a) is a schematic three-dimensional structure of the core pack 200, fig. 1 (b) is a front view of the positive electrode tab 311, fig. 1 (c) is a front view of the negative electrode tab 312, and fig. 1 (d) and (e) are top view structural diagrams of two possible core pack 200 structures.

As shown in fig. 1, the core pack 200 may include a pole piece 310, a tab 210 and a separation film 313, where the pole piece 310 may include a positive pole piece 311 and a negative pole piece 312, one or more positive pole tabs 211 are disposed on the positive pole piece 311, and one or more negative pole tabs 212 are disposed on the negative pole piece 312. The plurality of positive electrode tabs 211 may be disposed at the same end of the positive electrode tab 311, and the plurality of negative electrode tabs 212 may be disposed at the same end of the negative electrode tab 312. The positive electrode tab 311 and the positive electrode tab 311 may be integrally formed, for example, by cutting, stamping, or the like, or the positive electrode tab 311 and the positive electrode tab 211 may be integrally connected by welding, or the like. Similarly, the negative electrode tab 312 and the negative electrode tab 212 may be integrally formed, or may be integrally connected by welding or the like.

Illustratively, the positive electrode tab 311 may include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer may be coated on a surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer may protrude from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer may serve as the positive electrode tab 211. Taking a sodium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be layered oxide, sodium iron phosphate, sodium alum phosphate, prussian blue, prussian white or the like. The negative electrode tab 312 may include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer may be coated on a surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer may protrude from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer may serve as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like.

In some embodiments, the core pack 200 may be a winding core, as shown in (d) of fig. 1, the core pack 200 may be formed by winding at least one positive electrode tab 311, at least one negative electrode tab 312 and at least one isolation film 313, the isolation film 313 is disposed between the positive electrode tab 311 and the negative electrode tab 312, and the positive electrode tab 211 and the negative electrode tab 212 may be disposed on the same end surface of the winding core. When the core pack 200 is a winding core, a plurality of positive electrode tabs 211 may be disposed on a positive electrode sheet 311, a plurality of negative electrode tabs 212 may be disposed on a negative electrode sheet 312, and after at least one positive electrode sheet 311 and at least one negative electrode sheet 312 are wound into a winding core, positions of the plurality of positive electrode tabs 211 on the positive electrode sheet 311 may correspond, that is, the plurality of positive electrode tabs 212 may be aligned along the illustrated x-axis direction, and similarly, positions of the plurality of negative electrode tabs 212 on the negative electrode sheet 312 may also correspond.

In other embodiments, the core package 200 may also be a stacked core, as shown in (e) in fig. 1, where at least one positive electrode sheet 311, at least one negative electrode sheet 312, and at least one isolation film 313 are stacked along the thickness direction of the electrode sheet 310, the isolation film 313 is disposed between the positive electrode sheet 311 and the negative electrode sheet 312, and the positive electrode tab 211 and the negative electrode tab 212 may be disposed on the same end face of the stacked core. This thickness direction is also referred to as the x-axis direction as shown. When the core pack 200 is a stacked core, one positive electrode tab 211 may be disposed on one positive electrode tab 311, one negative electrode tab 212 may be disposed on one negative electrode tab 312, after the plurality of positive electrode tabs 311 and the plurality of negative electrode tabs 312 are stacked, positions of the plurality of positive electrode tabs 211 of the plurality of positive electrode tabs 311 may correspond to each other, and positions of the plurality of negative electrode tabs 212 of the plurality of negative electrode tabs 312 may also correspond to each other.

The material of the tab 210 and the pole piece 310 may be a conductive metal material, for example, the material of the positive pole piece 311 may be Al, for example, an Al foil, the material of the negative pole piece 312 may be Al or Cu, the material of the positive pole tab 211 may be the same as the material of the positive pole piece 311, and the material of the negative pole tab 212 may be the same as the material of the negative pole piece 312. The material of the isolation film 313 may be polypropylene (PP) or Polyethylene (PE), etc., which is not limited in the present application.

In the prior art, it was generally employed to widen the width of the individual core package 200, i.e., increase the dimension of the core package 200 in the illustrated y-axis direction, or to thicken the thickness of the individual core package 200, i.e., increase the dimension of the core package 200 in the x-axis direction. However, according to the productivity of the existing production equipment, the core pack 200 manufactured by the production equipment has limitations in terms of width and thickness, and when the width or thickness of the core pack 200 exceeds a certain size, it is necessary to redevelop the structure of the production equipment, greatly increasing the development and manufacturing costs of the battery.

Therefore, the capacity of the battery cell is greatly improved by improving the internal structure of the battery cell based on the production capacity of the existing production equipment.

The following describes, with reference to fig. 2 to 5, the structure of a core pack in a battery cell according to an embodiment of the present application, where the battery cell may include at least two rows of core packs, and the at least two rows of core packs may be sequentially arranged along a first direction, where the first direction is parallel to a main plane of the pole piece and perpendicular to a stacking direction of the pole piece. Each core pack of the at least two columns of core packs may be any one of the core pack 200 structures described in fig. 1, and the main plane of the pole piece may be a surface with a larger surface area of the pole piece, that is, the yz plane illustrated in the drawing, and after the pole piece is stacked or wound, the main plane of the pole piece may still refer to the yz plane illustrated in the drawing. After the pole pieces are wound or stacked to form a core package, the positive pole pieces and the negative pole pieces are stacked at intervals, and the stacking direction of the pole pieces is the illustrated x-axis direction. This first direction, also referred to as the width direction of the core pack, is also referred to as the y-axis direction as shown.

The connection mode between each row of core packages can be parallel connection, that is, the polarities of the lugs of the adjacent two rows of core packages in the width direction of the core package are the same, and the lugs of the adjacent two rows of core packages in the width direction of the core package are fixedly connected through the first connecting sheet.

As an example, as shown in fig. 2, the at least two columns of core packages may include two columns of core packages, for example, including the first core package 200A and the second core package 200B shown in fig. 2, the first core package 200A and the second core package 200B being disposed along the width direction of the core packages, that is, along the y-axis direction. The first positive electrode tab 211A of the first core pack 200A and the second positive electrode tab 211B of the second core pack 200B may be adjacently disposed along the width direction of the core pack, and the first positive electrode tab 211A and the second positive electrode tab 211B may be fixedly connected through a connecting sheet 221. When the first core pack 200A and the second core pack 200B are identical in size, planes of the first core pack 200A and the second core pack 200B parallel to the illustrated yz plane may be flush with each other, respectively, and planes of the first core pack 200A and the second core pack 200B parallel to the illustrated xy plane may be flush with each other, respectively.

It should be noted that, in the embodiment of the present application, the number of the positive electrode tabs of the core pack may be plural, and the positions of the plural positive electrode tabs may be corresponding, and the positions of the plural negative electrode tabs may also be corresponding, so that for convenience in describing the connection manner between the core packs, the core packs shown in fig. 2 and the later figures only schematically show one positive electrode tab and one negative electrode tab. That is, the first positive electrode tab 211A shown in fig. 2 may be formed by stacking a plurality of first positive electrode tabs 211A, the first negative electrode tab 212A, and the like.

In this example, the connection piece 221 that connects the positive electrode tabs adjacently disposed in the width direction of the core pack may also be referred to as a first connection piece. The connection piece 221 may be an anode connection piece, and the material of the anode connection piece may be a conductive metal material, and may be selected according to practical requirements, for example, when the battery cell is a sodium ion battery cell, the material of the anode connection piece may be Al, and when the battery cell is a lithium ion battery cell, the material of the anode connection piece may also be Al.

The first positive electrode tab 211A and the second positive electrode tab 211B may be fixedly connected to the connection piece 221 by welding, for example, by ultrasonic welding or laser welding. As described above, the first positive electrode tab 211A and the second positive electrode tab 211B may be formed by stacking a plurality of first positive electrode tabs 211A and a plurality of second positive electrode tabs 211B, respectively, in which case, the stacked first positive electrode tab 211A and second positive electrode tab 211B may be fixedly connected to the connection piece 221 by welding, so that the first core pack 200A and the second core pack 200B are electrically connected. And the first positive electrode tab 211A and the second positive electrode tab 211B are fixedly connected through the connecting sheet 221, so that current can be collected on the connecting sheet 221, so as to realize the electrical connection between the first core package 200A and the second core package 200B and the electrode column, and further realize the electrical connection between the battery cell and the external load.

When the positive electrode tabs of the first core pack 200A and the second core pack 200B are adjacently arranged, the negative electrode tabs of the first core pack 200A and the second core pack 200B can be mutually far away, and the first negative electrode tab 212A of the first core pack 200A and the second negative electrode tab 212B of the second core pack 200B can also be fixedly connected with corresponding connecting pieces respectively, so that the first negative electrode tab 212A is fixedly connected with corresponding electrode posts through the connecting pieces. For example, when the first negative electrode tab 212A of the first core pack 200A is formed by stacking a plurality of first negative electrode tabs 212A, the stacked plurality of first negative electrode tabs 212A may be fixedly connected to the connection piece 222. Similarly, when the second negative electrode tab 212B of the second core pack 200B is formed by stacking a plurality of second negative electrode tabs 212B, the stacked second negative electrode tab 212B may also be fixedly connected with the connecting piece 222, so that current is collected on the connecting piece 222, and further, electrical connection between the negative electrode tab and the corresponding negative electrode post is achieved.

In this example, the connection piece 222 may also be referred to as a second connection piece. The connection piece 222 may be a negative connection piece, and the material of the negative connection piece may be a conductive metal material, and may be selected according to practical requirements, for example, when the battery cell is a lithium ion battery cell, the material of the negative connection piece may be Cu, and when the battery cell is a sodium ion battery cell, the material of the negative connection piece may be Al.

It should be noted that, when the first negative electrode tab 212A and the second negative electrode tab 212B are far away from each other, the first negative electrode tab 212A and the second negative electrode tab 212B may be connected with the corresponding connection pieces 222, that is, the connection pieces 222 connected with the first negative electrode tab 212A and the second negative electrode tab 212B far away from each other are different connection pieces 222.

The number of the connecting pieces 221 and 222 may be one or more, for example, a plurality of first anode tabs 212A stacked and arranged may be fixedly connected by a plurality of connecting pieces 222. The shape of the connection piece 221 and the connection piece 222 may be rectangular, trapezoid, ellipse, circle or irregular shape, which is not limited in the present application, and the connection piece 221 and the connection piece 222 only need to be fixedly connected with the tab by welding or other means, and can realize electrical connection between a plurality of core packages and between the core package and the tab.

As another example, two adjacent columns of core packages may also be that the anode tabs are adjacently disposed, and the anode tabs that are adjacently disposed may be fixedly connected by the first connection piece. Referring to the structure shown in fig. 3, the first negative electrode tab 212A of the first core pack 200A and the second negative electrode tab 212B of the second core pack 200B may be disposed adjacent to each other in the width direction of the core pack, and the first negative electrode tab 212A and the second negative electrode tab 212B may be fixedly connected through a connection piece 222 to achieve electrical connection of the first core pack 200A and the second core pack 200B.

Similar to when the negative electrode tabs are far away from each other, the first positive electrode tab 211A of the first core pack 200A may be formed by stacking a plurality of first positive electrode tabs 211A, the plurality of first positive electrode tabs 211A may be fixedly connected by a connecting sheet 221, the second positive electrode tab 211B of the second core pack 200B may be formed by stacking a plurality of second positive electrode tabs 211B, and the plurality of second positive electrode tabs 211B may be fixedly connected by the connecting sheet 221, so that the first positive electrode tab 211A and the second positive electrode tab 211B are respectively electrically connected with the corresponding positive electrode posts.

In this example, the connection piece 222 connecting the negative electrode tabs adjacently disposed in the width direction of the core pack may be referred to as a first connection piece, and the connection piece 221 connecting the positive electrode tabs disposed apart in the width direction of the core pack may be referred to as a second connection piece. The connection piece 221 connected to the first positive electrode tab 211A and the connection piece 221 connected to the second positive electrode tab 211B may be different connection pieces 221, and may be positive connection pieces.

In some embodiments, each of the at least two columns of core packs may include a plurality of core packs, and the plurality of core packs in the same column of core packs may be sequentially arranged along a second direction, which is parallel to the stacking direction of the pole pieces. This second direction, also referred to as the x-axis direction as shown, may also be referred to as the thickness direction of the core pack. The pole lugs with the same polarity in the same column of core bags can be adjacently arranged along the thickness direction of the core bags, and the pole lugs with the same polarity which are adjacently arranged along the thickness direction of the core bags are fixedly connected through the third connecting sheet.

For example, referring to the structure shown in fig. 4, the core-package structure of the battery cell may be a 2x2 type, where (a) in fig. 4 is a three-dimensional schematic structural diagram of the core-package structure, that is, the core-package arrangement manner when the battery cell is in a use state, and (b) in fig. 4 is a top view of the battery cell after the core-package connection sheet shown in (a) in fig. 4 is unfolded at the position of the core-package connection sheet, so as to describe the connection manner between the core packages. When the core pack is assembled, the core pack can be unfolded according to the structure shown in (b) of fig. 4, so that the pole lugs and the corresponding connecting pieces are fixedly connected, and after the pole lugs are fixedly connected with the connecting pieces, the core pack is folded back to the structure shown in (a) of fig. 4. After the core-wrapping connection piece is unfolded, the core-wrapping pieces arranged in the same column may be adjacently arranged in the z-axis direction, as shown in (b) of fig. 4, and correspondingly, after the core-wrapping connection piece is unfolded, the positive electrode tab and the negative electrode tab of the core-wrapping pieces in the same column may also be adjacently arranged along the illustrated z-axis direction, respectively.

Each column of core packages of the battery cell may include two core packages, for example, a first column of core packages as illustrated may include a first core package 200A and a third core package 200C, and a second column of core packages may include a second core package 200B and a fourth core package 200D. The arrangement of the fourth core pack 200D and the third core pack 200C may be similar to the arrangement of the first core pack 200A and the second core pack 200B, and the connection of the fourth core pack 200D and the third core pack 200C may be similar to the connection of the first core pack 200A and the second core pack 200B, which will not be described herein.

The third core pack 200C may be disposed adjacent to the first core pack 200A in the thickness direction of the core pack, that is, may be disposed adjacent to the first core pack in the x-axis direction as shown. The first positive electrode tab 211A of the first core pack 200A and the third positive electrode tab 211C of the third core pack 200C may be disposed adjacent to each other in the thickness direction of the core pack and may be fixedly connected by a connection sheet 223, and the first negative electrode tab 212A of the first core pack 200A and the third negative electrode tab 212C of the third core pack 200C may also be disposed adjacent to each other in the thickness direction of the core pack and may be fixedly connected by a connection sheet 224, so that each core pack in the same column of core packs may be connected in parallel to increase the capacity of the battery cell.

Similarly, the fourth core pack 200D and the second core pack 200B may be disposed adjacent to each other in the thickness direction of the core pack, the second positive electrode tab 211B of the second core pack 200B and the fourth positive electrode tab 211D of the fourth core pack 200D may be disposed adjacent to each other in the thickness direction of the core pack and may be fixedly connected by the connection piece 223, and the second negative electrode tab 212B of the second core pack 200B and the fourth negative electrode tab 212D of the fourth core pack 200D may be disposed adjacent to each other in the thickness direction of the core pack and may be fixedly connected by the connection piece 224.

The connection piece 223 and the connection piece 224 may also be referred to as third connection piece. The connection 223 may be a positive connection and the connection 224 may be a negative connection.

In the above arrangement manner of the core package, the first positive electrode tab 211A, the second positive electrode tab 211B, the third positive electrode tab 211C and the fourth positive electrode tab 211D are close to each other, and the first positive electrode tab 211A, the second positive electrode tab 211B, the third positive electrode tab 211C and the fourth positive electrode tab 211D may be fixedly connected by the same connecting piece, that is, the connecting piece 221 and the connecting piece 223 may be the same connecting piece, or the first connecting piece and the third connecting piece may be the same connecting piece. Alternatively, the connection piece 221 may be fixedly connected to the connection piece 223, or the first connection piece and the third connection piece may be fixedly connected to realize electrical connection between the core packages in the same row and between the core packages in other rows, and improve the capacity of the battery cell.

The first negative electrode tab 212A is fixedly connected through a connecting sheet 222, the third negative electrode tab 212C is also fixedly connected through another connecting sheet 222, and then the connecting sheet 224 can be fixedly connected with the connecting sheet 222, so as to realize the fixed connection between the first negative electrode tab 212A of the first core package 200A and the third negative electrode tab 212C of the third core package 200C, and enable the parallel connection between the core packages in the same column of core packages. Alternatively, the first negative electrode tab 212A and the third negative electrode tab 212C may be fixedly connected by the same connecting piece 222 or 224. That is, the second connecting piece may be fixedly connected with the third connecting piece, or the second connecting piece and the third connecting piece may be the same connecting piece.

For example, after one or more groups of core-package structures shown in fig. 2 or fig. 3 are fixedly connected by using the connecting piece 221 and the connecting piece 222, the core-package structures shown in fig. 2 or fig. 3 may be fixedly connected by using the connecting piece 223 and the connecting piece 224 according to the use requirement of the battery. Alternatively, the multiple core packages may be arranged according to the structure shown in (B) of fig. 4 according to the actual use requirement, then the connection piece 221 or the connection piece 223 is used to fixedly connect the first positive electrode tab 211A, the second positive electrode tab 211B, the third positive electrode tab 211C and the fourth positive electrode tab 211D, and the connection piece 222 or the connection piece 224 is used to fixedly connect the first negative electrode tab 212A and the third negative electrode tab 212C, and to fixedly connect the second negative electrode tab 212B and the fourth negative electrode tab 212D, so as to obtain the core package structure shown in (a) of fig. 4 after folding.

In the core pack structure depicted in fig. 4, the positive electrode tabs of the adjacent two rows of core packs are disposed adjacent to each other, and similarly to the core pack structure depicted in fig. 2 and 3, the adjacent two rows of core packs may also be disposed adjacent to the negative electrode tabs (not shown in fig. 4). When the anode tabs of two adjacent core packages are adjacently arranged, the first anode tab 212A, the second anode tab 212B, the third anode tab 212C and the fourth anode tab 212D are close to each other, and the first anode tab 212A, the second anode tab 212B, the third anode tab 212C and the fourth anode tab 212D may be fixedly connected by the same connecting piece, for example, by the connecting piece 222 or the connecting piece 224. Or the first anode tab 212A and the second anode tab 212B may be fixedly connected by one connecting piece 222, the third anode tab 212C and the fourth anode tab 212D may be fixedly connected by another connecting piece 222, and then the connecting piece 224 may be used to fixedly connect the first anode tab 212A and the third anode tab 212C, and the second anode tab 212B and the fourth anode tab 212D, respectively. The positive electrode tabs can be fixedly connected through the connecting sheets 221 respectively, then the positive electrode tabs adjacently arranged along the thickness direction of the core pack are fixedly connected through the connecting sheets 223, and the positive electrode tabs adjacently arranged along the thickness direction of the core pack can also be fixedly connected through the connecting sheets 221 or the connecting sheets 223.

It should be understood that the above-mentioned core package structure is merely an example of the arrangement and connection manner of the core packages, and when each column of core packages includes more than two core packages, for example, 3 or 4 core packages, similar to the core package structure described in fig. 4 above, the positive electrode tabs of the same column of core packages may be disposed on the same side of the core packages, and the positive electrode tabs of each core package may be respectively and fixedly connected through connection pieces, and then the connection pieces of each positive electrode tab may be fixedly connected, or the positive electrode tabs of the same column of core packages may also be fixedly connected by the same connection piece. Correspondingly, the cathode tabs of the core packages in the same row can be arranged on the same side of the core package, the cathode tabs of the core packages in the same row can be fixedly connected through connecting pieces respectively, and then the connecting pieces of the cathode tabs are fixedly connected, or the cathode tabs of the core packages in the same row can be fixedly connected through the same connecting piece.

In some embodiments, the number of the core packages is not limited to two, and more core packages can be set according to actual use requirements to increase the capacity of the battery cells.

Referring to the structure shown in fig. 5, fig. 5 is a schematic structural diagram of the core pack after being unfolded along the position where the connecting piece is located, where the number of columns of the core pack may be 3, for example, a fifth core pack 200E and a sixth core pack 200F may be added to the core pack structure shown in fig. 4, where the fifth core pack 200E and the second core pack 200B are disposed adjacent to each other in the width direction of the core pack, and the sixth core pack 200F and the fourth core pack 200D are disposed adjacent to each other in the width direction of the core pack. When the first negative electrode tab 212A and the second negative electrode tab 212B are disposed adjacent to each other in the width direction of the core pack, the third negative electrode tab 212C may be disposed adjacent to the fourth negative electrode tab 212D in the width direction of the core pack, and the fifth positive electrode tab 211E of the fifth core pack 200E may be disposed adjacent to the second positive electrode tab 211B of the second core pack 200B in the width direction of the core pack, and the sixth positive electrode tab 211F of the sixth core pack 200F may be disposed adjacent to the fourth positive electrode tab 211D of the fourth core pack 200D in the width direction of the core pack.

Accordingly, the second positive electrode tab 211B, the fourth positive electrode tab 211D, the fifth positive electrode tab 211E and the sixth positive electrode tab 211F may be fixedly connected by the same connecting piece, for example, by the connecting piece 221 or the connecting piece 223, or the second positive electrode tab 211B, the fifth positive electrode tab 211E, the fourth positive electrode tab 211D and the sixth positive electrode tab 211F may be fixedly connected through the connecting piece 221, and then the fifth positive electrode tab 211E, the sixth positive electrode tab 211F, the third positive electrode tab 211C and the fourth positive electrode tab 211D may be fixedly connected through the connecting piece 223, respectively, so that the connecting piece 221 and the connecting piece 223 are fixedly connected. Similarly, the fifth anode tab 212E and the sixth anode tab 212F may be fixedly connected by the same connecting piece, for example, by the connecting piece 222 or the connecting piece 224, or may be fixedly connected by the connecting piece 222, and then the connecting piece 224 is used to realize the fixed connection of the fifth anode tab 212E and the sixth anode tab 212F.

The arrangement and connection manner of the core packages in the battery cells provided by the embodiments of the present application are described above with reference to fig. 2 to 5, and fig. 6 is a schematic structural diagram of a battery cell provided by the embodiment of the present application, where the battery cell may include any one of the core package structures described in fig. 2 to 5, and fig. 6 (b) is an exploded structural diagram of the structure shown in fig. 6 (a).

The cell may include at least two columns of core packages, a first housing 250, and a cover 251, and illustratively, the cell in fig. 6 includes two columns of core packages, and each of the two columns of core packages may include two core packages. At least two rows of core packages may be accommodated in the accommodating space formed by the first housing 250, and the cover plate 251 may be fixedly connected with the first housing 250.

The cap plate 251 may include a post 230, the post 230 may include a positive post 231 and a negative post 232, positive lugs disposed adjacent to each other in the width direction of the core pack may share the positive post 231, and similarly, negative lugs disposed adjacent to each other in the width direction of the core pack may also share the negative post 232. Referring to the cell structure shown in fig. 6, the arrangement mode of the core package in the cell may be 2x2, when the positive electrode tabs of two adjacent columns of core packages are adjacently arranged, the number of the positive electrode posts 231 may be one, the number of the negative electrode posts 232 may be two, one positive electrode post 231 and two negative electrode posts 232 may be arranged at intervals, and the positions of the positive electrode posts 231 may correspond to the positions of the positive electrode tabs, and the positions of the negative electrode posts 232 may respectively correspond to the positions of the negative electrode tabs arranged on two sides of the cell. That is, when two adjacent core packs include adjacent positive electrode tabs, that is, the first positive electrode tab 211A, the second positive electrode tab 211B, the third positive electrode tab 211C and the fourth positive electrode tab 211D, which are fixedly connected through the connecting piece 221 and/or the connecting piece 223, the first positive electrode tab 211A, the second positive electrode tab 211B, the third positive electrode tab 211C and the fourth positive electrode tab 211D are fixedly connected with the same positive electrode post, that is, the illustrated positive electrode post 231, through the connecting piece 221 and/or the connecting piece 223, for example, may be fixedly connected with the positive electrode post 231 by welding. Accordingly, the first anode tab 212A and the third anode tab 212C may be fixedly connected with one anode post 232 through the connection piece 222 and/or the connection piece 224, and the second anode tab 212B and the fourth anode tab 212D may be fixedly connected with the other anode post 232 through the connection piece, so that the battery cell may be electrically connected with components such as an external power load through the anode post 231 and the anode post 232.

In the above example, the positive electrode post 231 may be referred to as a first post, and the negative electrode post 232 may be referred to as a second post.

Similarly, when the anode tabs of two adjacent core bundles are adjacently disposed, the battery core may include one anode tab 232 and two cathode tabs 231, the first anode tab 212A, the second anode tab 212B, the third anode tab 212C and the fourth anode tab 212D may be fixedly connected with the same anode tab 232 through a connecting piece 222 and/or a connecting piece 224 (not shown in fig. 6), the first cathode tab 211A and the third cathode tab 211C may be fixedly connected with one cathode tab 231 through a connecting piece 221 and/or a connecting piece 223, and the second cathode tab 211B and the fourth cathode tab 211D may be fixedly connected with the other cathode tab 231 after being fixedly connected with the connecting piece 221 and/or the connecting piece 223. In this example, the negative electrode post 232 may be referred to as a first post and the positive electrode post 231 may be referred to as a second post.

When each column of core packages includes more than two core packages, for example, 4 core packages, all positive electrode tabs or all negative electrode tabs of two adjacent columns of core packages which are adjacently arranged along the width direction of the core packages can share one positive electrode post or one negative electrode post, that is, 8 core packages can share one positive electrode post or one negative electrode post. When the number of columns of the core packages is more than two, for example, the core packages include 3 columns, if the positive electrode lugs of the first column core package and the second column core package are adjacently arranged, the negative electrode lugs of the second column core package and the third column core package are adjacently arranged, the adjacently arranged positive electrode lugs can share one positive electrode pole, and the adjacently arranged negative electrode lugs can also share one negative electrode pole.

The cover plate 251 may further include through holes 252, the number of through holes 252 may be one or more, and at least a portion of the pole 230 may be exposed to the first housing 250 through the through holes 252. Illustratively, as shown in fig. 6, the through holes 252 may include first through holes 2521 and second through holes 2522, the number of the first through holes 2521 may be the same as the number of the positive electrode posts 231, and the positions of the first through holes 2521 may correspond to the positions of the positive electrode posts 231 such that at least a portion of the positive electrode posts 231 may be exposed to the cover plate 251 through the first through holes 2521. Similarly, the number of the second through holes 2522 may be the same as the number of the negative electrode posts 232, and the positions of the second through holes 2522 may correspond to the positions of the negative electrode posts 232, so that at least a portion of the negative electrode posts 232 may be exposed to the cover plate 251 through the second through holes 2522, so that the battery cell is electrically connected with external electric equipment or an energy storage system through the positive electrode posts 231 and the negative electrode posts 232.

When the core package arrangement mode of the battery core is 2x2, the positive electrode tabs of two adjacent columns of core packages, that is, the positive electrode tabs adjacently arranged along the width direction, share the positive electrode posts 231, and then the number of the positive electrode posts 231 may be 1, and the number of the corresponding first through holes 2521 may be 1. In this case, the negative electrode tabs 231 provided at both sides of the core pack may be connected to one negative electrode post 232, respectively, and the number of the second through holes 2522 may be 2.

The positive and negative electrode posts 231 and 232 may have a cylindrical shape, and accordingly, the first and second through holes 2521 and 2522 may have a circular shape, so that the positive and negative electrode posts 231 and 232 can pass through the first and second through holes 2521 and 2522, respectively.

The material of the positive electrode post 230 may be a conductive metal material, and the material of the positive electrode post 231 may be Al and the material of the negative electrode post 232 may be al—cu composite material, for example.

The cell may further include a pressure relief mechanism 240, so that the cell structure can exhaust gas generated during operation of the cell package, balance the air pressure in the first housing 250, and prevent the explosion of the cell. The pressure relief mechanism 240 may be a triggered mechanism, for example, the pressure relief mechanism 240 may be a score that may be broken when the air pressure within the first housing 250 exceeds a certain value such that the air within the first housing 250 is released. The pressure release mechanism 240 may be disposed on the cover 251 of the battery cell, for example, may be disposed in a region between the positive electrode post 231 and the negative electrode post 232, or the pressure release mechanism 240 may be disposed at an edge position of the cover 251, or may be disposed on the first housing 250, which is not limited in the present application.

The material of the cap plate 251 may be Al, and a side of the cap plate 251 adjacent to the core pack may include an insulating layer to prevent the core pack from being shorted. The material of the insulating layer may be PE or polyethylene terephthalate (polyethylene terephthalate, PET) or the like. The cover plate 251 and the core package can also be adhered with a protective tape to make the structure of the battery cell more stable. The material of the first housing 250 may also be Al.

The cover plate 251 may further include a liquid injection port (not shown in fig. 6) for injecting an electrolyte into the first housing 250 so that at least two rows of core packs are immersed in the electrolyte.

The width of the cell, i.e. the dimension of the cell in the first direction, may be less than or equal to 3000mm, i.e. the sum of the widths of at least two rows of cell packages may be less than or equal to 3000mm when the cell comprises at least two rows of cell packages.

The thickness of the cell, i.e. the dimension of the cell in the second direction, may range from 8mm to 200mm, i.e. the sum of the thicknesses of the one or more core packages in each column of core packages may range from 8mm to 200mm when each column of core packages comprises one or more core packages.

The battery cell can be a sodium ion battery cell or a lithium ion battery cell, or can also be a magnesium ion battery cell, a potassium ion battery cell and the like.

The battery cell can be a square battery cell or a soft package battery cell.

In the embodiment provided by the application, the plurality of rows of core packages are arranged in parallel in the width direction of the core packages, and the positive electrode lugs or the negative electrode lugs of the two adjacent rows of core packages are fixedly connected through the connecting sheet, so that the capacity of the battery monomer can be effectively improved, the device structure is not required to be redeveloped to thicken the thickness of the existing core package or widen the width of the existing core package, and development and production cost improvement is avoided. Each row of core packages comprises a plurality of core packages, positive electrode lugs and negative electrode lugs of the plurality of core packages in each row of core packages are adjacently arranged, and the core packages are fixedly connected through connecting sheets respectively, so that the capacity of the battery cell can be further increased. Further, when the battery cell is applied to a battery pack, an electric automobile and an energy storage system, the storage capacity of the battery pack, the electric automobile and the energy storage system can be effectively improved.

Embodiments of the present application also provide a battery pack, where the battery pack may include one or more battery cells as described in fig. 6, and the plurality of battery cells may be connected in series or parallel, for example, by connecting the poles of the battery cells through a bus bar, so that the plurality of battery cells are connected in series or parallel. The material of the busbar may be a conductive metal material, for example Al.

One or more of the cells may include any of the core-in-package structures described in fig. 2 to 5, and the number and number of the core-in-packages in the plurality of cells may be the same or different.

The battery pack may further include a second housing within which one or more battery cells may be housed. The battery pack may also include components such as a battery management system.

The embodiment of the application also provides an electric automobile, which comprises the battery pack and an on-board load, wherein the battery pack can be used for supplying power to the on-board load. The electric automobile can be a pure electric automobile, a hybrid electric automobile, a range-extended automobile or the like, and the load on the automobile can comprise equipment such as in-automobile air conditioning equipment, automobile lamps, sound boxes and the like, and the application is not limited.

It should be noted that, the electric automobile described above is only used as an application scenario example of the core pack, the electric core and the battery pack described in the present application, and the core pack, the electric core and the battery pack provided in the present application may also be applied to other electric equipment, such as ship equipment, aerospace equipment, etc.

The embodiment of the application also provides an energy storage system, which can comprise a plurality of battery packs and a power converter, wherein the battery packs are used for carrying out power conversion on the voltage output by the battery packs and then outputting the voltage to a power grid or an external load, and/or the power converter is used for carrying out power conversion on the voltage output by an external power supply and then outputting the voltage to the battery packs. The energy storage system can be a charging pile, a station standby power supply, a mobile base station power supply and the like, and can also be an energy storage system in the scenes of household energy storage, industrial and commercial energy storage, distributed energy storage and the like, and the application is not limited.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (13)

1. The battery cell is characterized by comprising at least two rows of core bags, a cover plate and a first shell;

each core pack in the at least two rows of core packs comprises a pole piece and a pole lug, the pole lug is arranged on the pole piece, the at least two rows of core packs are sequentially arranged along a first direction, and the first direction is parallel to a main plane of the pole piece and perpendicular to the stacking direction of the pole piece;

the polarities of the lugs of two adjacent core packages in the first direction are the same, and the lugs of two adjacent core packages in the first direction are fixedly connected through a first connecting sheet;

the at least two rows of core bags are accommodated in the first shell, the cover plate is fixedly connected with the first shell, the cover plate comprises a first pole, and the first pole is fixedly connected with the first connecting piece.

2. The cell of claim 1, wherein tabs of the two adjacent rows of core packages disposed adjacent in the first direction are connected to the same first terminal by the first connection tab.

3. The battery cell according to claim 1 or 2, wherein the polarities of the tabs of the two adjacent rows of core packages which are far away from each other along the first direction are the same, and the tabs of the two adjacent rows of core packages which are far away from each other along the first direction are fixedly connected with at least one second connecting sheet respectively;

the cover plate further comprises a second pole, and the second pole is fixedly connected with the at least one second connecting sheet.

4. The cell of claim 3, wherein each of the at least two rows of core packs comprises a plurality of the core packs, the plurality of core packs being disposed in sequence along a second direction, the second direction being parallel to a stacking direction of the pole pieces;

the pole lugs which are arranged adjacently along the second direction in the core bag in the same column have the same polarity, and the pole lugs which are arranged adjacently along the second direction are fixedly connected through a third connecting sheet.

5. The cell of claim 4, wherein the third connection tab is the same connection tab as the first connection tab or the second connection tab.

6. The cell of claim 4, wherein the third connection tab is fixedly connected to the first connection tab or the second connection tab.

7. The cell of any one of claims 1-6, wherein the cover plate further comprises a pressure relief mechanism.

8. The cell of any one of claims 1-7, wherein the cell has a dimension in the first direction of less than or equal to 3000mm.

9. The cell of any one of claims 1 to 8, wherein the cell has a dimension in a second direction in the range of 8mm to 200mm, the second direction being parallel to the stacking direction of the pole pieces.

10. The cell of any one of claims 1 to 9, wherein the cell is a lithium ion cell or a sodium ion cell.

11. A battery pack, comprising:

one or more cells according to any one of claims 1 to 10, one or more of the cells being connected in series or in parallel;

and a second housing in which one or more of the battery cells are housed.

12. An electric vehicle comprising the battery pack of claim 11 and an on-board load, the battery pack being configured to power the on-board load.

13. An energy storage system, comprising a plurality of battery packs according to claim 11 and a power converter, wherein the power converter is used for performing power conversion on a voltage output by the battery packs and outputting the voltage to an electric network or an external load, and/or the power converter is used for performing power conversion on a voltage output by an external power supply and outputting the voltage to the battery packs.