CN219998293U - Cells, battery packs, electric vehicles and energy storage systems - 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

Cells, battery packs, electric vehicles and energy storage systems

Technical field

The embodiments of this application relate to the field of new energy technology, and more specifically, to a battery cell, a battery pack, an electric vehicle and an energy storage system.

Background technique

As the energy storage market becomes increasingly prosperous, energy storage products are developing towards large capacity. Large-capacity single cells can significantly increase the energy density of energy storage systems, reduce system manufacturing costs, and reduce the difficulty of integration. In the existing technology, the capacity of a battery cell or battery core is usually increased by thickening the thickness of a single core pack or widening the width of a single core pack. However, when the width or thickness of the battery core exceeds a certain size, it is necessary to Redevelopment of the equipment structure greatly increases the development and manufacturing costs of battery cells, and also places higher requirements on the equipment compatibility of the current production line. Therefore, it is necessary to provide a battery core structure to increase the capacity of the battery core.

Contents of the invention

Embodiments of the present application provide a battery core, a battery pack, an electric vehicle and an energy storage system, which can increase the capacity of the battery core.

In a first aspect, an electric core is provided, including at least two columns of core packages, a cover plate and a first shell. Each core package in the at least two columns of core packages includes a pole piece and a pole tab. Disposed on the pole piece, the at least two columns of core packages are arranged sequentially along a first direction, the first direction is parallel to the main plane of the pole piece and perpendicular to the stacking direction of the pole piece; the at least two columns of core packages are arranged in sequence along a first direction. In the core pack, the tabs arranged adjacently along the first direction of two adjacent core packs have the same polarity, and the tabs adjacently arranged along the first direction of the two adjacent core packs pass through the first The connecting pieces are fixedly connected; the at least two column core packages are contained in the first housing, and the cover plate is fixedly connected to the first housing. The cover plate includes a first pole, and the first The pole is fixedly connected to the first connecting piece.

In the embodiment provided by this application, at least two columns of core packages are arranged side by side, and the adjacently arranged tabs of two adjacent columns of core packages have the same polarity and are fixedly connected through the first connecting piece, so that at least two columns of core packages can be connected in parallel. The connection effectively increases the capacity of the battery cells or battery cells without the need to widen the width or thickness of the core package itself, thus avoiding the increase in production costs caused by the development and transformation of existing production equipment. The pole tabs of the same polarity that are adjacently arranged along the first direction or the width direction can be fixedly connected through the first connecting piece, so that the current can be collected on the first connecting piece to facilitate the electrical connection between the battery core and the external load and other components. connect.

With reference to the first aspect, in some implementations of the first aspect, the tabs of the two adjacent columns of core packages that are adjacently arranged along the first direction are connected to the same third one through the first connecting piece. One pole is connected.

In the embodiment provided by this application, tabs of the same polarity that are adjacently arranged along the first direction can share a pole, which can reduce the number of poles and reduce the production cost of the battery core.

In conjunction with the first aspect, in some implementations of the first aspect, the poles of the two adjacent columns of core packages arranged away from each other along the first direction have the same polarity, and the two adjacent columns of core packages have the same polarity. The pole tabs arranged away from each other along the first direction are respectively fixedly connected to at least one second connecting piece; the cover plate also includes a second pole, and the second pole is connected to the at least one second connecting piece. Fixed connection.

In the embodiment provided by this application, the tabs arranged far away along the first direction are fixedly connected through the second connecting piece respectively, so that the current can be collected on the second connecting piece, so as to facilitate the realization of components such as the battery core and the external load. electrical connection.

In conjunction with the first aspect, in some implementations of the first aspect, each column of the core packs in the at least two columns of core packs includes a plurality of the core packs, and the plurality of core packs are sequentially along the second direction. It is arranged that the second direction is parallel to the stacking direction of the pole pieces, and the pole tabs arranged adjacently along the second direction in the core packs in the same column have the same polarity and are adjacent along the thickness direction of the core packs. The provided pole tabs are fixedly connected through the third connecting piece.

In the embodiment provided by this application, each column of core packs includes multiple core packs, and the tabs adjacently arranged in the second direction, that is, the thickness direction of the core pack in each column of core packs have the same polarity, that is, in the same column. The positive electrode tabs in the core pack are arranged adjacently along the thickness direction of the core pack, and the negative electrode tabs are also arranged adjacently along the thickness direction of the core pack, so that all core packs in the same row of core packs are connected in parallel, which can increase the capacity of the battery core. . The tabs of the same polarity that are adjacently arranged along the thickness direction of the core package are fixedly connected through the third connecting piece, so that the current can be collected on the third connecting piece to facilitate the electrical connection between the battery core and components such as external loads.

With reference to the first aspect, in some implementations of the first aspect, the third connecting piece and the first connecting piece or the second connecting piece are the same connecting piece.

In the embodiments provided by this application, the tabs of the same polarity of the core packages in the same row can share the connecting piece, and the core packages in the same row and the core packages arranged in parallel can also share the connecting piece, thereby reducing the number of connecting pieces and simplifying the electrical circuit. The core processing process reduces the production cost of the battery core.

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

In the embodiment provided by this application, the third connecting piece is fixedly connected to the first connecting piece or the second connecting piece, which can realize the electrical connection between the core packs in the same row and the core packs arranged in parallel; each row of core packs includes multiple When a core package is used, the tabs of two adjacent columns of core packages that are adjacently arranged along the width direction of the core package can be fixedly connected to a first pole through the third connecting piece and the first connecting piece, and the two adjacent columns The tabs of the core package that are arranged far away along the width direction of the core package can be fixedly connected to a second pole through the third connecting piece and the second connecting piece, thereby further reducing the number of poles and simplifying the structure of the battery core. Reduce the production cost of battery cells.

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

In the embodiment provided by this application, the cover plate of the battery core includes a pressure relief mechanism, which can balance the air pressure inside the battery core and prevent the battery core from exploding.

With reference to the first aspect, in some implementations of the first aspect, the size of the battery core in the first direction is less than or equal to 3000 mm.

With reference to the first aspect, in some implementations of the first aspect, the size range of the battery core in the second direction is 8 mm to 200 mm.

In connection with the first aspect, in some implementations of the first aspect, the battery cell is a lithium ion battery cell or a sodium ion battery cell.

In a second aspect, a battery pack is provided, including: one or more battery cells as described in the first aspect or any implementation of the first aspect, one or more of the battery cells are connected in series or in parallel; A second housing, in which one or more of the battery cores are accommodated.

In a third aspect, an electric vehicle is provided, including the battery pack as described in the second aspect or any implementation of the second aspect and an on-board load, where the battery pack is used to power the on-board load.

A fourth aspect provides an energy storage system, including the battery pack and a power converter as described in the second aspect or any implementation of the second aspect, the power converter being used to convert the voltage output by the battery pack After performing power conversion, the voltage is output to the power grid or an external load, and/or the power converter is used to perform power conversion on the voltage output by the external power supply and then output it to the battery pack.

Description of the drawings

Figure 1 is a schematic structural diagram of a core package.

Figure 2 is a schematic structural diagram of a core package provided by an embodiment of the present application.

Figure 3 is a schematic structural diagram of a core package provided by an embodiment of the present application.

Figure 4 is a schematic structural diagram of a core package provided by an embodiment of the present application.

Figure 5 is a schematic structural diagram of a core package provided by an embodiment of the present application.

Figure 6 is a schematic structural diagram of a battery core provided by an embodiment of the present application.

Detailed ways

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

Reference in this 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. Therefore, the phrases "in one embodiment", "in some embodiments", "in other embodiments", "in other embodiments", etc. appearing in different places in this specification are not necessarily References are made to the same embodiment, but rather to "one or more but not all embodiments" unless specifically stated otherwise.

In various embodiments of the present application, first, second, etc. are only used to indicate that multiple objects are different. For example, the first core package and the second core package are just to represent different core packages. It should not have any impact on the core package itself, the number, etc., and the above-mentioned first, second, etc. should not cause any limitations on the embodiments of the present application.

The terms “including,” “includes,” “having,” and variations thereof all mean “including but not limited to,” unless otherwise specifically emphasized.

In the embodiments of this application, the number of nouns, unless otherwise specified, means "singular noun or plural noun", that is, "one or more", and "plurality" means two or more. "And/or" describes the relationship between associated objects, indicating that there can be three relationships. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.

Figure 1 is a schematic structural diagram of a core package 200 provided by an embodiment of the present application. Among them, (a) in Figure 1 is a three-dimensional structural diagram of the core package 200, (b) in Figure 1 is a front view of the positive electrode piece 311, and (c) in Figure 1 is a front view of the negative electrode piece 312. (d) and (e) in Figure 1 are top structural views of two possible core package 200 structures.

As shown in FIG. 1 , the core package 200 may include a pole piece 310 , a pole tab 210 and an isolation film 313 . The pole piece 310 may include a positive pole piece 311 and a negative pole piece 312 . The positive pole piece 311 is provided with one or more The positive electrode tab 211 and the negative electrode tab 312 are provided with one or more negative electrode tabs 212. The plurality of positive electrode tabs 211 can be disposed at the same end of the positive electrode piece 311 , and the plurality of negative electrode tabs 212 can also be disposed at the same end of the negative electrode piece 312 . The positive electrode tab 311 and the positive electrode tab 311 can be an integrally formed structure, for example, they can be integrally formed through cutting, stamping, or other processes. Alternatively, the positive electrode tab 311 and the positive electrode tab 211 can also be connected as a whole through welding or other methods. Similarly, the negative electrode piece 312 and the negative electrode tab 212 can also be an integrally formed structure, or can also be connected as a whole through welding or other methods.

For example, the positive electrode sheet 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 the surface of the positive electrode current collector. The positive electrode current collector that is not coated with the positive electrode active material layer may protrude from the coated surface. The positive electrode current collector coated with the positive electrode active material layer or the positive electrode current collector without the positive electrode active material layer can be used as the positive electrode tab 211 . Taking sodium-ion batteries 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 alkali phosphate, Prussian blue or Prussian white, etc. The negative electrode sheet 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 the surface of the negative electrode current collector. The negative electrode current collector that is not coated with the negative electrode active material layer may protrude from the coated negative electrode active material. The negative electrode current collector without a layer of negative electrode active material can be used as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon.

In some embodiments, the core pack 200 may be a rolled core. As shown in (d) in FIG. 1 , the core pack 200 may be composed of at least one positive electrode piece 311 , at least one negative electrode piece 312 and at least one isolation film. 313 is wound, and the isolation film 313 is arranged between the positive electrode piece 311 and the negative electrode piece 312. The positive electrode tab 211 and the negative electrode tab 212 can be arranged on the same end surface of the winding core. When the core package 200 is a rolled core, a plurality of positive electrode tabs 211 can be provided on one positive electrode piece 311, and a plurality of negative electrode tabs 212 can be provided on a negative electrode piece 312. At least one positive electrode piece 311 and After at least one negative electrode piece 312 is wound into a winding core, the positions of the plurality of positive electrode tabs 211 on the positive electrode piece 311 can correspond. That is to say, the multiple positive electrode tabs 212 can be aligned along the x-axis direction as shown in the figure. Arrangement, similarly, the positions of the plurality of negative electrode tabs 212 on the negative electrode piece 312 can also be corresponding.

In other embodiments, the core package 200 can also be a stacked core. As shown in (e) in FIG. 1 , at least one positive electrode piece 311 , at least one negative electrode piece 312 and at least one isolation film 313 are provided along the electrode pieces. 310 are stacked in the thickness direction, the isolation film 313 is disposed between the positive electrode piece 311 and the negative electrode piece 312, and the positive electrode tab 211 and the negative electrode tab 212 can be arranged on the same end surface of the stacked core. This thickness direction is also the x-axis direction in the figure. When the core package 200 is a stacked core, one positive electrode piece 311 can be provided with a positive electrode tab 211, and one negative electrode piece 312 can be provided with a negative electrode tab 212. Between multiple positive electrode pieces 311 and multiple pieces After the negative electrode pieces 312 are stacked on each other, the positions of the plurality of positive electrode tabs 211 of the plurality of positive electrode pieces 311 can be corresponding, and the positions of the plurality of negative electrode tabs 212 of the plurality of negative electrode pieces 312 can also be corresponding.

The materials of the pole tabs 210 and the pole pieces 310 can be conductive metal materials. For example, the material of the positive electrode tabs 311 can be Al, for example, Al foil. The material of the negative electrode tabs 312 can be Al or Cu. The material of the positive electrode tabs can be Al or Cu. The material of 211 may be the same as the material of the positive electrode tab 311 , and the material of the negative electrode tab 212 may be the same as the material of the negative electrode tab 312 . The isolation film 313 may be made of polypropylene (PP) or polyethylene (PE), which is not limited in this application.

In the prior art, it is common to widen the width of a single core package 200, that is, to increase the size of the core package 200 in the y-axis direction as shown in the figure, or to thicken the thickness of a single core package 200, that is, to increase the size of the core package 200. 200 Dimensions in the x-axis direction. However, according to the production capacity of the existing production equipment, the core package 200 manufactured by the production equipment has limitations in width and thickness. When the width or thickness of the core package 200 exceeds a certain size, the structure of the production equipment needs to be redeveloped, which greatly increases the cost. Battery development and manufacturing costs.

Therefore, this application is based on the production capacity of existing production equipment and greatly increases the capacity of the battery core by improving the internal structure of the battery core.

The following describes the structure of the core packs in the battery core provided by the embodiment of the present application with reference to FIGS. 2 to 5 . The battery core may include at least two rows of core packs, and the at least two rows of core packs may be arranged sequentially along a first direction. The first The direction is parallel to the main plane of the pole pieces and perpendicular to the stacking direction of the pole pieces. Each core package in at least two columns of core packages can be any of the core package 200 structures described in Figure 1. The main plane of the pole piece can be the surface with a larger surface area of the pole piece, which is the yz plane as shown in the figure. After the pole pieces are stacked or rolled, the main plane of the pole pieces can still refer to the yz plane as shown in the figure. After the pole pieces are rolled or stacked to form a core package, the positive pole pieces and the negative pole pieces are stacked and spaced apart from each other. The stacking direction of the pole pieces refers to the x-axis direction as shown in the figure. The first direction is the y-axis direction in the figure, and the first direction can also be called the width direction of the core package.

The connection mode between each column core pack can be a parallel connection, that is to say, at least two adjacent columns of core packs have the same polarity of the tabs arranged adjacently along the width direction of the core pack, and the poles along the core pack have the same polarity. The tabs arranged adjacently in the width direction of the package are fixedly connected through the first connecting piece.

As an example, as shown in Figure 2, the at least two columns of core packages may include two columns of core packages, such as a first core package 200A and a second core package 200B shown in Figure 2. The first core package 200A and the second core package 200B. The two-core package 200B is arranged along the width direction of the core package, 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 can be arranged adjacently along the width direction of the core pack. The first positive electrode tab 211A and the second positive electrode tab 211B can be fixedly connected through the connecting piece 221. When the dimensions of the first core package 200A and the second core package 200B are the same, the planes parallel to the yz plane in the figure of the first core package 200A and the second core package 200B can be flush with each other, and the first core package 200A and the second core package 200B can be flush with each other. The planes of the first core package 200A and the second core package 200B that are parallel to the xy plane in the figure may also be flush with each other.

It should be noted that in the embodiment of the present application, the number of positive electrode tabs of the core package may be multiple, and the positions of the multiple positive electrode tabs may be corresponding, and the positions of the multiple negative electrode tabs may also be corresponding. In order to facilitate the description of the connection method between the core packages, the core package shown in Figure 2 and the following figures only schematically shows one positive electrode tab and one negative electrode tab. That is to say, the first positive electrode tab 211A shown in FIG. 2 may be stacked by a plurality of first positive electrode tabs 211A, and the first negative electrode tab 212A and the like are similar.

In this example, the connecting piece 221 connecting the positive electrode tabs arranged adjacently along the width direction of the core package may also be called a first connecting piece. The connecting piece 221 can be a positive connecting piece, and the material of the positive connecting piece can be a conductive metal material, and can be selected according to actual use requirements. For example, when the battery core is a sodium ion battery, the material of the positive connecting piece It can be Al. When the battery cell is a lithium ion battery cell, the material of the positive electrode connecting piece can also be Al.

The first positive electrode tab 211A and the second positive electrode tab 211B and the connecting piece 221 can be fixedly connected by welding, for example, by ultrasonic welding or laser welding. As mentioned above, the first positive electrode tab 211A and the second positive electrode tab 211B can respectively be formed by stacking a plurality of first positive electrode tabs 211A and a plurality of second positive electrode tabs 211B. In this case, the stacked The plurality of first positive electrode tabs 211A and the plurality of second positive electrode tabs 211B can be fixedly connected to the connecting piece 221 by welding, so that the first core package 200A and the second core package 200B are electrically connected. And the first positive electrode tab 211A and the second positive electrode tab 211B are fixedly connected through the connecting piece 221, so that the current can be collected on the connecting piece 221, so as to facilitate the connection between the first core package 200A and the second core package 200B. The electrical connection between the battery core and the external load and other components is realized.

When the positive electrode tabs of the first core pack 200A and the second core pack 200B are arranged adjacently, the negative electrode tabs of the first core pack 200A and the second core pack 200B can be far away from each other, and the first negative electrode tab of the first core pack 200A The tab 212A and the second negative tab 212B of the second core package 200B can also be fixedly connected to the corresponding connecting piece, so that the first negative tab 212A is fixedly connected to the corresponding pole through the connecting piece. For example, when the first negative electrode tabs 212A of the first core package 200A are stacked by a plurality of first negative electrode tabs 212A, the stacked plurality of first negative electrode tabs 212A may be fixedly connected to the connecting piece 222 . Similarly, when the second negative electrode tabs 212B of the second core package 200B are stacked by a plurality of second negative electrode tabs 212B, the stacked second negative electrode tabs 212B can also be fixedly connected to the connecting piece 222, so as to facilitate The current is collected on the connecting piece 222, thereby realizing the electrical connection between the negative electrode tab and the corresponding negative electrode post.

In this example, the connecting piece 222 may also be called a second connecting piece. The connecting piece 222 can be a negative connecting piece, and the material of the negative connecting piece can be a conductive metal material, and can be selected according to actual use requirements. For example, when the battery cell is a lithium ion battery, the material of the negative connecting piece It can be Cu. When the battery core is a sodium ion battery core, the material of the negative electrode connecting piece can 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 can be connected to the corresponding connecting piece 222 respectively, that is to say , the connecting pieces 222 connected to the first negative electrode tab 212A and the second negative electrode tab 212B that are far away from each other are different connecting pieces 222 .

The number of the connecting pieces 221 and 222 can be one or more. For example, a plurality of first negative electrode tabs 212A arranged in a stack can also be fixedly connected through a plurality of connecting pieces 222 . The shape of the connecting piece 221 and the connecting piece 222 can be a rectangle, a trapezoid, an ellipse, a circle or an irregular shape. This application is not limited to this. The connecting piece 221 and the connecting piece 222 only need to meet the requirements. It only needs to be fixedly connected to the pole lug by welding or other methods, and it can achieve electrical connection between multiple core packages and between the core packages and the poles.

As another example, the negative electrode tabs of two adjacent columns of core packages may be arranged adjacently, and the adjacent negative electrode tabs may be fixedly connected through the first connecting 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 can be arranged adjacently along the width direction of the core pack, and the first negative electrode tab The ear 212A and the second negative electrode ear 212B can be fixedly connected through the connecting piece 222 to realize the electrical connection between the first core package 200A and the second core package 200B.

Similar to when the negative electrode tabs are arranged far away from each other, the first positive electrode tab 211A of the first core package 200A can be stacked by a plurality of first positive electrode tabs 211A, and the plurality of first positive electrode tabs 211A can be connected by The piece 221 is fixedly connected. The second positive electrode tab 211B of the second core package 200B can also be formed by stacking a plurality of second positive electrode tabs 211B. The plurality of second positive electrode tabs 211B can also be fixedly connected through the connecting piece 221. This is so that the first positive electrode tab 211A and the second positive electrode tab 211B are electrically connected to the corresponding positive electrode posts.

In this example, the connecting piece 222 connecting the negative electrode tabs arranged adjacently along the width direction of the core pack may be called a first connecting piece, and the connecting piece 221 connecting the positive electrode tabs arranged far away along the width direction of the core pack may be called a first connecting piece. It is the second connecting piece. The connecting piece 221 connected to the first positive electrode tab 211A and the connecting piece 221 connected to the second positive electrode tab 211B can be different connecting pieces 221, and both can be positive connecting pieces.

In some embodiments, each column of core packages in at least two columns of core packages may include multiple core packages, and the multiple core packages in the same row of core packages may be arranged sequentially along a second direction, which is parallel to the pole piece. Stacking direction. The second direction is the x-axis direction in the figure, and the second direction may also be called the thickness direction of the core package. The pole tabs of the same polarity in the same row of core packs can be arranged adjacently along the thickness direction of the core pack, and the pole tabs of the same polarity adjacently arranged along the thickness direction of the core pack are fixedly connected through the third connecting piece.

For example, referring to the structure shown in Figure 4, the core package structure of the battery core can be a 2x2 type, where (a) in Figure 4 is a three-dimensional structural diagram of the core package structure, that is, when the battery core is in use. Arrangement of the core packages, (b) in Figure 4 is a top view of the core package shown in (a) in Figure 4 after unfolding around the position of the connecting piece, so as to facilitate the description of the connection method between the core packages. When assembling the core package, the core package can be unfolded according to the structure shown in (b) in Figure 4 to facilitate the fixed connection of the tabs and the corresponding connecting pieces. After the tabs and the connecting pieces are fixedly connected, , the core package is gathered back to the structure shown in (a) in Figure 4. After the core packages are deployed around the position of the connecting piece, the core packages arranged in the same row can be arranged adjacent to each other in the z-axis direction, as shown in (b) in Figure 4. Correspondingly, the core packages are deployed around the position of the connecting piece. Finally, the positive electrode tabs and negative electrode tabs of the same row of core packages can also be arranged adjacently along the z-axis direction as shown in the figure.

Each core pack of the battery core may include two core packs. For example, the first core pack shown in the figure may include a first core pack 200A and a third core pack 200C, and the second core pack may include a second core pack 200B. and the fourth core package 200D. The arrangement between the fourth core package 200D and the third core package 200C can be similar to the arrangement between the first core package 200A and the second core package 200B, and the fourth core package 200D and the third core package The connection method between 200C can also be similar to the connection method between the first core package 200A and the second core package 200B, which will not be described again here.

The third core package 200C may be disposed adjacent to the first core package 200A along the thickness direction of the core package, that is, the third core package 200C may be disposed adjacent to the x-axis direction in the figure. The first positive electrode tab 211A of the first core package 200A and the third positive electrode tab 211C of the third core package 200C can be arranged adjacently along the thickness direction of the core package, and can be fixedly connected through the connecting piece 223. The first negative electrode tab 212A of the package 200A and the third negative electrode tab 212C of the third core package 200C can also be arranged adjacently along the thickness direction of the core package, and can be fixedly connected through the connecting piece 224, so that the core packages in the same row can be Each core package is connected in parallel to increase the capacity of the battery core.

Similarly, the fourth core pack 200D and the second core pack 200B can be arranged adjacently along the thickness direction of the core pack, and the second positive electrode tab 211B of the second core pack 200B and the fourth positive electrode tab of the fourth core pack 200D 211D can be arranged adjacently along the thickness direction of the core package and can be fixedly connected through the connecting piece 223. The second negative electrode tab 212B of the second core package 200B and the fourth negative electrode tab 212D of the fourth core package 200D can be arranged along the core package. are arranged adjacently in the thickness direction, and can be fixedly connected through the connecting piece 224.

The connecting piece 223 and the connecting piece 224 can also be called a third connecting piece. The connecting piece 223 can be a positive connecting piece, and the connecting piece 224 can be a negative connecting piece.

In the above arrangement of the core packs, 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. 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 can be fixedly connected by the same connecting piece. That is to say, the connecting piece 221 and the connecting piece 223 can be the same connecting piece, or in other words, the connecting piece 221 and the connecting piece 223 can be the same connecting piece. The first connecting piece and the third connecting piece may be the same connecting piece. Alternatively, the connecting piece 221 can also be fixedly connected to the connecting piece 223, or the first connecting piece and the third connecting piece can be fixedly connected to achieve electrical connection between core packages in the same row and with other core packages in the battery core. Connect and increase the capacity of the battery cell.

The first negative electrode tab 212A is fixedly connected through the connecting piece 222, and the third negative electrode tab 212C can also be fixedly connected through another connecting piece 222. Then the connecting piece 224 can be fixedly connected to the connecting piece 222 to realize the first core package. The fixed connection between the first negative electrode tab 212A of the 200A and the third negative electrode tab 212C of the third core pack 200C allows the core packs in the same row of core packs to be connected in parallel. Alternatively, the first negative electrode tab 212A and the third negative electrode tab 212C may also be fixedly connected by the same connecting piece 222 or 224. That is to say, the second connecting piece can be fixedly connected to the third connecting piece, or the second connecting piece and the third connecting piece can be the same connecting piece.

For example, one or more groups of the core package structures shown in Figure 2 or Figure 3 can be fixedly connected using the connecting piece 221 and the connecting piece 222, and then the multiple groups of Figure 2 or Figure 3 can be connected according to the usage requirements of the battery. The core package structure shown is fixedly connected through connecting pieces 223 and 224 . Alternatively, multiple core packages can be arranged according to the structure shown in (b) in Figure 4 according to actual use requirements, and then the connecting piece 221 or the connecting piece 223 is used to connect the first positive electrode tab 211A and the second positive electrode tab 211B. , the third positive electrode tab 211C and the fourth positive electrode tab 211D are fixedly connected, and the connecting piece 222 or the connecting piece 224 is used to fixedly connect the first negative electrode tab 212A and the third negative electrode tab 212C respectively, and the second negative electrode is fixedly connected. The pole tab 212B and the fourth negative pole tab 212D are fixedly connected, and after being folded together, the core package structure shown in (a) in Figure 4 is obtained.

In the core package structure described in Figure 4, the positive electrode tabs of two adjacent columns of core packages are arranged adjacently. Similar to the core package structure described in Figures 2 and 3, the adjacent two columns of core packages can also be The negative electrode tabs are arranged adjacently (not shown in Figure 4). When the negative electrode tabs of two adjacent columns of core packages are arranged adjacently, the first negative electrode tab 212A, the second negative electrode tab 212B, the third negative electrode tab 212C and the fourth negative electrode tab 212D are close to each other, and the first negative electrode tab The ear 212A, the second negative electrode tab 212B, the third negative electrode tab 212C and the fourth negative electrode tab 212D may be fixedly connected by the same connecting piece, such as the connecting piece 222 or the connecting piece 224 . Alternatively, the first negative electrode tab 212A and the second negative electrode tab 212B can be fixedly connected through a connecting piece 222, and the third negative electrode tab 212C and the fourth negative electrode tab 212D can be fixedly connected through another connecting piece 222, and then The first negative electrode tab 212A and the third negative electrode tab 212C, as well as the second negative electrode tab 212B and the fourth negative electrode tab 212D are respectively fixedly connected with the connecting piece 224 . The positive electrode tabs can be fixedly connected through connecting pieces 221 respectively, and then the positive electrode tabs arranged adjacently along the thickness direction of the core package can be fixedly connected through connecting pieces 223. The positive electrode tabs adjacently arranged along the thickness direction of the core package can also be fixedly connected. They are fixedly connected by connecting pieces 221 or 223 .

It should be understood that the above-mentioned core pack structure is only an example of the arrangement and connection mode of the core packs. When each row of core packs includes more than two core packs, for example, when it includes 3 or 4 core packs, it will be the same as that shown in Figure 4 above. Similar to the described core package structure, the positive tabs of the core packages in the same row can be arranged on the same side of the core package, and the positive tabs of each core package can be fixedly connected through connecting tabs, and then the connecting tabs of each positive tab can be fixedly connected. Fixed connection, or the positive tabs of the core packages in the same column can be fixedly connected by the same connecting piece. Correspondingly, the negative electrode tabs of the core packs in the same row can also be arranged on the same side of the core pack, and the negative electrode tabs of multiple core packs in the same row can also be fixedly connected through connecting tabs, and then the connecting tabs of each positive tab are connected to each other. Fixed connection, or the positive tabs of the core packages in the same column can be fixedly connected by the same connecting piece.

In some embodiments, the number of rows of core packs may not be limited to the two columns mentioned above, and more rows of core packs may also be provided according to actual usage requirements to increase the capacity of the battery cells.

Referring to the structure shown in Figure 5, Figure 5 is a schematic structural diagram of the core package expanded along the position of the connecting piece. The number of columns of the core package can be 3. For example, a fifth core package can be added to the core package structure shown in Figure 4. The core pack 200E and the sixth core pack 200F are arranged adjacent to each other along the width direction of the core pack. The fifth core pack 200E and the second core pack 200B are adjacent to each other along the width direction of the core pack. The sixth core pack 200F and the fourth core pack 200D are adjacent to each other along the width direction of the core pack. set up. When the first negative electrode tab 212A and the second negative electrode tab 212B are arranged adjacently along the width direction of the core package, the third negative electrode tab 212C and the fourth negative electrode tab 212D may be arranged adjacently along the width direction of the core package, and The fifth positive electrode tab 211E of the fifth core pack 200E can be arranged adjacent to the second positive electrode tab 211B of the second core pack 200B along the width direction of the core pack, and the sixth positive electrode tab 211F of the sixth core pack 200F can be arranged adjacent to the second positive electrode tab 211B of the second core pack 200B. The fourth positive electrode tabs 211D of the fourth core pack 200D are arranged adjacently along the width direction of the core pack.

Correspondingly, 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 can be fixedly connected by the same connecting piece, such as the connecting piece 221 or the connecting piece 223, Alternatively, the second positive electrode tab 211B and the fifth positive electrode tab 211E, the fourth positive electrode tab 211D and the sixth positive electrode tab 211F can be fixedly connected respectively through the connecting piece 221, and then the fifth positive electrode tab 211E and the sixth positive electrode tab 211F can be fixedly connected respectively. The sixth positive electrode tab 211F, the third positive electrode tab 211C and the fourth positive electrode tab 211D are respectively fixedly connected through the connecting piece 223, and the connecting piece 221 and the connecting piece 223 are fixedly connected. Similarly, the fifth negative electrode tab 212E and the sixth negative electrode tab 212F can be fixedly connected by the same connecting piece, such as the connecting piece 222 or the connecting piece 224, or they can be fixedly connected by the connecting piece 222 respectively, and then connected through the connecting piece. The piece 224 realizes the fixed connection of the fifth negative electrode tab 212E and the sixth negative electrode tab 212F.

The above describes the arrangement and connection method of the core packages in the battery core provided by the embodiment of the present application in conjunction with Figures 2 to 5. Figure 6 is a schematic structural diagram of a battery core provided by the embodiment of the present application. The battery core may include the above figures. 2 to any of the core package structures described in Figure 5, wherein (b) in Figure 6 is an exploded structural view of the structure shown in (a) in Figure 6.

The battery core may include at least two columns of core packages, a first housing 250 and a cover 251. For example, the battery core in FIG. 6 includes two columns of core packages, and each of the two columns of core packages may include Two core packs. At least two rows of core packages can be accommodated in the accommodation space formed by the first housing 250 , and the cover plate 251 can be fixedly connected to the first housing 250 .

The cover plate 251 may include a pole 230, and the pole 230 may include a positive pole 231 and a negative pole 232. The positive poles arranged adjacently along the width direction of the core package may share the positive pole 231. Similarly, along the Negative electrode tabs arranged adjacently in the width direction of the core package may also share the negative electrode post 232 . Referring to the battery core structure shown in Figure 6, the arrangement pattern of the core packages in the battery core can be 2x2. When the positive electrode tabs of two adjacent columns of core packages are arranged adjacently, the number of the positive electrode posts 231 can be one. , the number of negative poles 232 can be two, one positive pole 231 and two negative poles 232 can be arranged at intervals, and the position of the positive pole 231 can correspond to the position of the positive tab, and the negative pole 232 The positions of can respectively correspond to the positions of the negative electrode tabs provided on both sides of the battery core. That is to say, the two adjacent columns of core packages include adjacently arranged 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. When 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 connected through the connecting piece 221 and/or The piece 223 is fixedly connected to the same positive pole, that is, the positive pole 231 shown in the figure. For example, the piece 223 can be fixedly connected to the positive pole 231 by welding. Correspondingly, the first negative electrode tab 212A and the third negative electrode tab 212C can be fixedly connected to a negative electrode post 232 through the connecting piece 222 and/or the connecting piece 224, and the second negative electrode tab 212B and the fourth negative electrode tab 212D can be fixedly connected. It is fixedly connected to another negative pole 232 through a connecting piece, so that the battery core can be electrically connected to external electrical loads and other components through the positive pole 231 and the negative pole 232 .

In the above example, the positive pole 231 may be called the first pole, and the negative pole 232 may be called the second pole.

Similarly, when the negative electrode tabs of two adjacent columns of core packs are arranged adjacently, the battery core may include one negative electrode post 232 and two positive electrode posts 231, the first negative electrode tab 212A and the second negative electrode tab 212B. , the third negative electrode tab 212C and the fourth negative electrode tab 212D can be fixedly connected to the same negative electrode post 232 through the connecting piece 222 and/or the connecting piece 224 (not shown in Figure 6), the first positive electrode tab 211A and The third positive electrode tab 211C is fixedly connected to one positive electrode post 231 through the connecting piece 221 and/or the connecting piece 223, and the second positive electrode tab 211B and the fourth positive electrode tab 211D are fixedly connected through the connecting piece 221 and/or the connecting piece 223. Finally, it is fixedly connected with another positive pole 231. In this example, the negative pole 232 may be called a first pole, and the positive pole 231 may be called a second pole.

When each column of core packs includes more than two core packs, for example, four core packs, all positive electrode tabs or all negative electrode tabs adjacent to each other along the width direction of the core packs in two adjacent columns can be shared. One positive pole or one negative pole, that is, 8 core packages can share one positive pole or one negative pole. When the number of rows of core packs is two or more, for example, when it includes three rows of core packs, if the positive tabs of the first row of core packs and the second row of core packs are arranged adjacently, then the second row of core packs and the third row of core packs will The negative electrode tabs of the package are arranged adjacently. The adjacent positive electrode tabs can share a positive electrode post, and the adjacent negative electrode tabs can also share a negative electrode post.

The cover plate 251 may also include a through hole 252 , the number of the through holes 252 may be one or more, and at least part of the pole post 230 may pass through the through hole 252 to be exposed to the first housing 250 . For example, as shown in FIG. 6 , the through hole 252 may include a first through hole 2521 and a second through hole 2522 . The number of the first through hole 2521 may be the same as the number of the positive poles 231 , and the first through hole 2521 may be the same as the number of the positive poles 231 . The position of the through hole 2521 may correspond to the position of the positive pole 231 , so that at least part of the positive pole 231 may pass through the first through hole 2521 and be exposed to the cover 251 . Similarly, the number of the second through holes 2522 can be the same as the number of the negative electrode posts 232, and the position of the second through holes 2522 can correspond to the position of the negative electrode posts 232, so that at least part of the negative electrode posts 232 can The second through hole 2522 is exposed to the cover 251 so that the battery core is electrically connected to external electrical equipment or energy storage systems through the positive pole 231 and the negative pole 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 arranged adjacently along the width direction, share the positive electrode posts 231, then the number of positive electrode posts 231 can be 1, and the corresponding number of first through holes 2521 may be 1. In this case, the negative electrode tabs 231 provided on both sides of the core package can be connected to one negative electrode post 232 respectively, and then the number of the second through holes 2522 can be two.

The shapes of the positive electrode pole 231 and the negative electrode pole 232 may be cylindrical, and accordingly, the shapes of the first through hole 2521 and the second through hole 2522 may be circular, so that the positive electrode pole 231 and the negative electrode pole 232 can pass through the first through hole 2521 and the second through hole 2522 respectively.

The material of the pole 230 may be a conductive metal material. For example, the material of the positive pole 231 may be Al, and the material of the negative pole 232 may be an Al-Cu composite material.

The battery core may also include a pressure relief mechanism 240 so that the battery core structure can discharge the gas generated when the core package is working, balance the air pressure in the first housing 250, and prevent the battery core from exploding. The pressure relief mechanism 240 can be a trigger structure. For example, the pressure relief mechanism 240 can be a notch. When the air pressure in the first housing 250 exceeds a certain value, the notch can be destroyed so that the pressure inside the first housing 250 can be reduced. of gas is released. The pressure relief mechanism 240 can be disposed on the cover plate 251 of the battery core, for example, it can be disposed in the area between the positive pole 231 and the negative pole 232. The pressure relief mechanism 240 can also be disposed at the edge of the cover plate 251. Or it can also be provided on the first housing 250, which is not limited in this application.

The cover plate 251 may be made of Al, and a side of the cover plate 251 close to the core package may include an insulating layer to prevent the core package from short circuiting. The material of the insulating layer may be PE or polyethylene terephthalate (PET). A protective tape can also be pasted between the cover plate 251 and the core package to make the structure of the battery core more stable. The material of the first housing 250 may also be Al.

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

The width of the battery core, that is, the size of the battery core in the first direction, may be less than or equal to 3000 mm. That is to say, when the battery core includes at least two rows of core packs, the sum of the widths of the at least two rows of core packs may be less than Or equal to 3000mm.

The thickness range of the battery core, that is, the size range of the battery core in the second direction, can be 8 mm to 200 mm. That is to say, when each row of core packs includes one or more core packs, one core pack in each row Or the sum of the thicknesses of multiple core packages may range from 8mm to 200mm.

The battery cell can be a sodium ion battery cell or a lithium ion battery cell, or it can also be a magnesium ion battery cell, a potassium ion battery cell, etc.

The battery cell can be a square battery cell or a soft-packed battery cell.

In the embodiment provided by this application, multiple columns of core packages are arranged side by side in the width direction of the core package, and the positive electrode tabs or negative electrode tabs of two adjacent columns of core packages are fixedly connected through connecting pieces, which can effectively improve the performance of the battery cells. Capacity, and there is no need to redevelop the equipment structure to thicken the thickness of the existing core package or widen the width of the existing core package, avoiding increases in development and production costs. Each row of core packs includes multiple core packs, and the positive electrode tabs and negative electrode tabs of the multiple core packs in each row of core packs are adjacently arranged and fixedly connected through connecting pieces respectively, which can further increase the size of the battery cells. capacity. Furthermore, when the battery core is used in battery packs, electric vehicles and energy storage systems, it can effectively increase the storage capacity of battery packs, electric vehicles and energy storage systems.

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

One or more battery cells may include any of the core package structures described in FIGS. 2 to 5 , and the number and rows of core packages in multiple battery cells may be the same or different.

The battery pack may further include a second housing, and one or more battery cells may be accommodated in the second housing. The battery pack may also include components such as a battery management system.

An embodiment of the present application also provides an electric vehicle. The electric vehicle includes the battery pack described above and a load on the vehicle. The battery pack can be used to power the load on the vehicle. The electric vehicle can be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle, etc. The load on the vehicle can include in-car air conditioning equipment, lights, speakers and other equipment, which is not limited in this application.

It should be noted that the electric vehicles described above are only examples of application scenarios for the core packs, cells and battery packs described in this application. The core packs, cells and battery packs provided in this application can also be applied to other applications. On electrical equipment, such as ship equipment, aerospace equipment, etc.

Embodiments of the present application also provide an energy storage system. The energy storage system may include a plurality of battery packs as described above, and a power converter. The power converter is used to perform power conversion on the voltage output by the battery pack and then output it. To the power grid or external load, and/or, the power converter is used to convert the voltage output by the external power supply and then output it to the battery pack. The energy storage system can be a charging pile, site backup power supply, mobile base station power supply, etc. It can also be an energy storage system in scenarios such as household energy storage, industrial and commercial energy storage, distributed energy storage, etc. This application is not limited.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. should be covered by the protection scope of this application. Therefore, the protection scope of this application should 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.