CN219371156U - Prismatic battery and battery pack - Google Patents

Abstract

The utility model relates to the technical field of batteries and discloses a prismatic battery and a battery pack; the prismatic battery comprises a battery shell and a battery cell group; the battery shell is arranged as a prism; the battery cell group is arranged in the battery shell, and comprises at least two battery cells which are arranged into a cylinder, and two adjacent battery cells in the battery cell group are arranged side by side. The space utilization rate of the prismatic battery is high; and the risk of thermal runaway caused by the swelling deformation of the battery due to severe swelling of the large surface of the traditional square shell battery can be avoided.

Description

Prismatic battery and battery pack

Technical Field

The disclosure relates to the technical field of batteries, in particular to a prismatic battery and a battery pack comprising the prismatic battery.

Background

The cylindrical battery cell has the advantages of mature winding process, high automation degree, high production efficiency, good consistency, relatively low cost and the like, and is favored by users.

However, the space utilization of a cylindrical battery prepared from a cylindrical cell is low.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure is directed to overcoming the disadvantage of the low space utilization of the related art, and providing a prismatic battery with high space utilization and a battery pack including the prismatic battery.

According to one aspect of the present disclosure, there is provided a prismatic battery including:

a battery case provided as a prism;

the battery cell group is arranged in the battery shell and comprises at least two battery cells, the battery cells are arranged into cylinders, and two adjacent battery cells in the battery cell group are arranged side by side.

According to the prismatic battery, on one hand, the battery shell is arranged to be a prismatic body, after the prismatic batteries are grouped, the adjacent prismatic batteries can be tightly attached, and the space utilization rate of the battery pack is improved. On the other hand, the battery cell is arranged as a cylinder, and the expansion of the battery cell is uniform; therefore, the extrusion force of the battery cell to the battery shell is also relatively uniform, and the expansion force generated by heating of the battery cell can be counteracted from multiple directions, so that the probability of expansion of the battery cell can be reduced, the probability of expansion of the whole prismatic battery can be reduced, and the risk of thermal runaway caused by battery expansion deformation due to serious large-area expansion of the traditional square-shell battery is avoided. In the battery case, at least two electric cores are arranged in the battery case, and the at least two electric cores are connected in series or in parallel in the battery case, so that not only can parts such as a part of current collecting disc, lower plastic and the like in the prismatic battery be omitted, but also parts such as a busbar, an adapter and the like for connecting the prismatic battery can be omitted, and the cost can be reduced; moreover, the space occupied by these components is reduced, thereby improving the space utilization inside the prismatic battery and the space utilization of the battery pack.

According to another aspect of the present disclosure, there is provided a battery pack including:

a battery box;

the first prismatic battery is the prismatic battery described above, and the first prismatic battery is provided in at least two.

According to the battery pack, on one hand, the battery shell is arranged to be a prism body, after the prismatic batteries are grouped, the adjacent prismatic batteries can be tightly attached, and the space utilization rate of the battery pack is improved. On the other hand, the battery cell is arranged as a cylinder, and the expansion of the battery cell is uniform; therefore, the extrusion force of the battery cell to the battery shell is also relatively uniform, and the expansion force generated by heating of the battery cell can be counteracted from multiple directions, so that the probability of expansion of the battery cell can be reduced, the probability of expansion of the whole prismatic battery can be reduced, the risk of thermal runaway caused by the expansion deformation of the battery due to serious expansion of the large surface of the traditional square-shell battery is avoided, and the safety of the battery pack is improved. In the battery case, at least two electric cores are arranged in the battery case, and the at least two electric cores are connected in series or in parallel in the battery case, so that not only can parts such as a part of current collecting disc, lower plastic and the like in the prismatic battery be omitted, but also parts such as a busbar, an adapter and the like for connecting the prismatic battery can be omitted, and the cost can be reduced; moreover, the space occupied by these components is reduced, thereby improving the space utilization inside the prismatic battery and the space utilization of the battery pack.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

Fig. 1 is a schematic structural view of a first example embodiment of a prismatic battery of the present disclosure.

Fig. 2 is a schematic top view of the prismatic battery of fig. 1 with the positive post and top plate removed.

Fig. 3 is a schematic structural view of a second exemplary embodiment of a prismatic battery of the present disclosure.

Fig. 4 is a schematic structural view of a third exemplary embodiment of a prismatic battery of the present disclosure.

Fig. 5 is a schematic structural view of a fourth exemplary embodiment of a prismatic battery of the present disclosure.

Fig. 6 is a schematic structural view of a fifth exemplary embodiment of a prismatic battery of the present disclosure.

Fig. 7 is a schematic structural view of a sixth exemplary embodiment of a prismatic battery of the present disclosure.

Fig. 8 is a schematic structural view of a seventh exemplary embodiment of a prismatic battery of the present disclosure.

Fig. 9 is a schematic structural view of an eighth example embodiment of a prismatic battery of the present disclosure.

Fig. 10 is a schematic structural view of an example embodiment of a battery pack of the present disclosure.

Reference numerals illustrate:

1. a battery case; 11. an end plate; 111. a top plate; 112. a bottom plate; 12. a side plate;

2. a cell group; 21. a battery cell; 211. a body portion; 212. a first positive tab; 213. a first negative electrode tab;

3. an adapter; 31. a connecting strip; 4. a positive electrode post; 5. a negative electrode column;

100. a first prismatic battery; 200. and a second prismatic battery.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the recited "up" component will become the "down" component. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

The terms "a," "an," "the," "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and do not limit the number of their objects.

In the present application, unless explicitly specified and limited otherwise, the term "coupled" is to be construed broadly, and for example, "coupled" may be either fixedly coupled, detachably coupled, or integrally formed; can be directly connected or indirectly connected through an intermediate medium. "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

Example embodiments of the present disclosure provide a prismatic battery, as shown with reference to fig. 1-9, that may include a battery case 1 and a cell stack 2; the battery case 1 is provided as a prismatic body; the battery cell group 2 is arranged in the battery shell 1, the battery cell group 2 can comprise at least two battery cells 21, the battery cells 21 are arranged into cylinders, and two adjacent battery cells 21 in the battery cell group 2 are arranged side by side.

According to the prismatic battery disclosed by the disclosure, on one hand, the battery shell 1 is arranged into the prismatic body, after the prismatic batteries are grouped, the adjacent prismatic batteries can be tightly attached, and the space utilization rate of the battery pack is improved. On the other hand, the battery cell 21 is arranged as a cylinder, and the expansion of the battery cell 21 is uniform; therefore, the extrusion force of the battery cell 21 to the battery shell 1 is also relatively uniform, and the expansion force generated by heating of the battery cell 21 can be counteracted from multiple directions, so that the probability of expansion of the battery cell 21 can be reduced, the probability of expansion of the whole prismatic battery can be reduced, and the risk of thermal runaway caused by battery expansion deformation due to serious large-area expansion of the traditional square-shell battery is avoided. On the other hand, at least two electric cores 21 are arranged in the battery shell 1, and the at least two electric cores 21 are connected in series or in parallel in the battery shell 1, so that not only parts such as a part of current collecting disc, lower plastic and the like in the prismatic battery can be omitted, but also parts such as a part of bus bars, connecting pieces and the like for connecting the prismatic battery can be omitted, and therefore, the cost can be reduced; moreover, the space occupied by these components is reduced, thereby improving the space utilization inside the prismatic battery and the space utilization of the battery pack.

In the present exemplary embodiment, the prismatic battery may include the battery case 1, and the battery case 1 may be provided as a prismatic body, that is, the battery case 1 may include two end plates 11 disposed opposite to each other, the two end plates 11 being a top plate 111 and a bottom plate 112, respectively, the top plate 111 and the bottom plate 112 each being provided as a polygon, and a plurality of side plates 12 being connected between the top plate 111 and the bottom plate 112. Side plates 12, top plate 111 and bottom plate 112 surround the receiving cavities that form prismatic cells.

Specifically, the battery case 1 may be provided in a rectangular parallelepiped shape, the top plate 111 and the bottom plate 112 are each provided in a rectangular shape, the side plates 12 are provided in four, and two side plates 12 provided opposite to each other are identical. In this case, the battery cell group 2 may include two battery cells 21.

Referring to fig. 1 and 2, the battery case 1 may be provided as a regular triangular prism, the top plate 111 and the bottom plate 112 are each provided as regular triangles, the side plates 12 are provided in three, the side plates 12 are provided as rectangles, and the three side plates 12 are identical. In this case, the battery cell group 2 may include three battery cells 21.

Referring to fig. 3, the battery case 1 may be provided in a rectangular parallelepiped shape, the top plate 111 and the bottom plate 112 are each provided in a square shape, the side plates 12 are provided in four pairs, and the four side plates 12 are identical. In this case, the battery cell group 2 may include four battery cells 21.

Referring to fig. 3, the battery case 1 may be provided as a right triangular prism, the top plate 111 and the bottom plate 112 are each provided as right triangles, the side plates 12 are provided in three, and the side plates 12 are provided as rectangles. In this case, the battery cell group 2 may include two battery cells 21.

Of course, the foregoing merely exemplifies several structures of the battery case 1, and the battery case 1 may be other various prisms, which are not described herein.

The battery shell 1 is set to be a prism, after the prismatic batteries are grouped, adjacent prismatic batteries can be tightly attached, and the space utilization rate of the battery pack is improved.

In the present exemplary embodiment, referring to fig. 1 and 2, the battery case 1 is provided with the battery cell group 2, and the battery cell group 2 includes at least two battery cells 21, that is, the battery cell group 2 may include two battery cells 21, three battery cells 21, four battery cells 21 or more battery cells 21, and so on, and the matching relationship between the structure of the battery case 1 and the number of battery cells 21 has been illustrated, which is not described herein.

The cells 21 are configured as cylinders, and the diameters of at least two cells 21 may be the same, but the diameters of at least two cells 21 may also be different. When the battery cell 21 heats and expands, expansion force is generated at all positions of the cylindrical surface of the battery cell 21, and the expansion is uniform; therefore, the extrusion force of the battery cell 21 to the side plate 12 of the battery shell 1 is also relatively uniform, and the expansion force generated by the heating of the battery cell 21 can be counteracted from multiple directions, so that the probability of the expansion of the battery cell 21 can be reduced, the probability of the expansion of the whole prismatic battery can be reduced, and the risk of thermal runaway caused by the expansion deformation of the battery due to serious large-surface expansion of the traditional square-shell battery is avoided.

In addition, at least two electric cores 21 are arranged in the battery shell 1, and at least two electric cores 21 are connected in series or in parallel in the battery shell 1, so that not only parts such as a part of current collecting disc and lower plastic in the prismatic battery can be omitted, but also parts such as a part of bus bar and an adapter 3 used for connecting the prismatic battery can be omitted, and therefore, the cost can be reduced; moreover, the space occupied by these components is reduced, thereby improving the space utilization inside the prismatic battery and the space utilization of the battery pack.

Adjacent two cells 21 in the cell group 2 are arranged side by side, i.e. the adjacent two cells 21 in the cell group 2 are arranged on a straight line which is parallel to the end plate 11 of the battery housing 1. It can also be said that at least two cells 21 in one cell group 2 are arranged to form a layer, instead of at least two cells 21 in one cell group 2 being stacked.

The cell 21 has two opposite end faces, which are a first end face and a second end face, respectively, and the end face of the cell 21 is parallel to the end plate 11 of the battery case 1. The first end faces and the second end faces of at least two cells 21 in one cell group 2 are coplanar. I.e. the height of at least two cells 21 in one cell group 2 in the third direction is the same. Of course, in other example embodiments of the present disclosure, the heights of at least two cells 21 in one cell group 2 in the third direction may be different.

Furthermore, the ratio of the total volume of at least two cells 21 in one cell group 2 to the volume of the battery case 1 is 80% or more. In the case of a typical cylindrical battery in which one cell 21 is provided in the battery case 1, the ratio of the volume of the cell 21 to the volume of the battery case 1 is about 75%.

The ratio of the total area of the end surfaces of at least two cells 21 of the cell group 2 to the area of the end surface of the battery case 1 is 60% or more and 99% or less. That is, the ratio of the total area of the first end face or the second end face of at least two cells 21 to the area of the top plate 111 or the bottom plate 112 of the battery case 1 is 60% or more and 99% or less. For example, the above ratio may be 63%, 67%, 72%, 77%, 81%, 86%, 90%, 92%, 97%, etc. If the ratio is too large, the gap between two adjacent battery cells 21 is too small, so that the swelling space of the battery cells 21 is insufficient and heat dissipation is difficult to realize, and the safety risk is further caused; if the ratio is too small, the gap between the adjacent two cells 21 is too large, resulting in low utilization of the internal space of the prismatic battery.

In the case where the cell group 2 includes two cells 21, the line of orthographic projection of the center points of the end faces of the two cells 21 on the first reference plane is a line segment, and orthographic projection of the center point of the end plate 11 on the first reference plane is located on the line segment formed by the line of orthographic projection of the center points of the end faces of the two cells 21 on the first reference plane. The first reference surface is parallel to the end surface.

Referring to fig. 2, the orthographic projection of the center point of the end plate 11 on the first reference plane coincides with the center point of the pattern surrounded by the orthographic projections of the center points of the end surfaces of the at least two cells 21 on the first reference plane.

Specifically, for example, in the case where the cell group 2 includes three cells 21, a pattern surrounded by orthographic projections of the center points B of the end surfaces of the three cells 21 on the first reference surface is a triangle, and in the case where the diameters of the three cells 21 are the same, the triangle is a regular triangle, and orthographic projections of the center points a of the end plates 11 on the first reference surface coincide with the center points B' of the regular triangle surrounded by orthographic projections of the center points B of the end surfaces of the three cells 21 on the first reference surface.

In the case where the cell group 2 includes four cells 21, a figure surrounded by orthographic projections of the center points B of the end faces of the four cells 21 on the first reference surface is a quadrangle, and in the case where the diameters of the four cells 21 are the same, the quadrangle is a square or a diamond, and orthographic projections of the center points a of the end plates 11 on the first reference surface coincide with the center points B' of the square or the diamond surrounded by orthographic projections of the center points B of the end faces of the four cells 21 on the first reference surface.

The main weight of the prismatic battery is in the electric core 21 and the electrolyte, and the electrolyte is liquid and fills the accommodating cavity of the battery shell 1, so that the gravity center of the prismatic battery is determined by the electric core 21, and the arrangement is such that the gravity center of the whole prismatic battery is basically coincident with the gravity center of the battery shell 1, and the installation and the transportation are convenient.

Referring to fig. 1 and 2, at least two cells 21 may be connected in parallel.

The battery cell 21 may include a body portion 211, and the body portion 211 may include a positive electrode tab and a negative electrode tab (not shown in the drawings), and a separator disposed between the positive electrode tab and the negative electrode tab. The positive electrode sheet, the negative electrode sheet, and the separator are wound to form a cylindrical body portion 211 such that the body portion 211 has a first end face and a second end face which are disposed opposite to each other, the first end face and the second end face being perpendicular to the axial direction of the prismatic battery.

The cell 21 may further include a first positive tab 212 and a first negative tab 213. The first positive tab 212 is connected to the positive plate and is disposed on a side of the first end surface facing away from the main body 211, and may be a portion of the positive plate extending to protrude from the main body 211 and being bent to a side of the first end surface facing away from the main body 211 to form the first positive tab 212; in this case, the first positive tab 212 may cover the first end surface entirely or may cover a part of the first end surface.

The first negative electrode tab 213 is connected to the negative electrode sheet and is disposed on a side of the second end surface facing away from the body 211, and may be a portion of the negative electrode sheet extending and protruding from the body 211, and bent to a side of the second end surface facing away from the body 211 to form the first negative electrode tab 213; in this case, the first negative electrode tab 213 may cover the second end surface entirely or may cover a part of the second end surface.

The first positive lugs 212 of all the cells 21 of one cell group 2 are arranged close to the top plate 111, and the adaptor 3 is connected with the first positive lugs 212 of all the cells 21 of one cell group 2, so that the parallel connection of all the cells 21 of one cell group 2 is realized.

A first through hole may be provided on the top plate 111 of the battery case 1, and the prismatic battery may further include a positive electrode post 4, the positive electrode post 4 penetrating through the first through hole, and the positive electrode post 4 may be connected with the adapter 3 to form a positive electrode of the prismatic battery.

The first negative electrode tabs 213 of all the cells 21 of one cell group 2 are disposed close to the bottom plate 112, the first negative electrode tabs 213 of all the cells 21 of one cell group 2 are connected with the bottom plate 112, parallel connection of the negative electrodes of all the cells 21 of one cell group 2 is achieved through the bottom plate 112, and the bottom plate 112 serves as the negative electrode of the prismatic battery.

Of course, the adapter 3 may be disposed between the first negative electrode tabs 213 of all the cells 21 of the one cell group 2 and the bottom plate 112, and the first negative electrode tabs 213 of all the cells 21 of the one cell group 2 are electrically connected to the bottom plate 112 through the adapter 3, and the bottom plate 112 serves as a negative electrode of the prismatic battery.

Referring to fig. 5, a second through hole may be formed in the bottom plate 112 of the battery case 1, and the prismatic battery may further include a negative electrode post 5, the negative electrode post 5 penetrating through the second through hole, and the negative electrode post 5 may be connected with the adapter 3 connected to the first negative electrode tab 213 to form a negative electrode of the prismatic battery.

Moreover, the adaptor 3 is arranged into an integral structure, so that the intensity of the adaptor 3 is higher, the connection intensity of the adaptor 3 and the battery cell 21 can be ensured, and the battery cell 21 and the adaptor 3 are prevented from being separated in the use process. Specifically, referring to fig. 2 and 3, the adapter 3 may be provided in a plate shape identical to the shape of the top plate 111; referring to fig. 6, the adaptor 3 may further include a plurality of connection bars 31, one ends of the plurality of connection bars 31 being integrally connected, and the opposite ends of the plurality of connection bars 31 extending in the radial direction of the prismatic battery and being connected to the first positive tab 212 or the first negative tab 213 of the battery cell 21. Of course, the adaptor 3 may be configured in other structures according to different arrangement manners of the battery cells 21, which will not be described herein.

Referring to fig. 7, at least two cells 21 may also be connected in series.

Specifically, a part of the battery cells 21 in at least two battery cells 21 may be inverted, that is, the first negative electrode lugs 213 of a part of the battery cells 21 are all disposed near the bottom plate 112, and the first positive electrode lugs 212 of another part of the battery cells 21 are all disposed near the bottom plate 112; the first negative electrode lugs 213 and the first positive electrode lugs 212 of the two battery cells 21 are connected through the adapter 3; for example, the series connection of two cells 21 can be realized by one adapter 3, the series connection of three cells 21 can be realized by two adapters 3, and the series connection of four cells 21 can be realized by three adapters 3. The number of the adapters 3 may be determined according to the number of the battery cells 21, which will not be described.

In this case, the adapter 3 may be provided in a strip shape.

A first through hole may be provided on the top plate 111 of the battery case 1, and the prismatic battery may further include a positive electrode post 4, where the positive electrode post 4 penetrates through the first through hole, and the positive electrode post 4 may be connected with a first positive electrode tab 212 of the electric core 21 that is not connected with the adapter 3 to form a positive electrode of the prismatic battery. The base plate 112 may serve as the negative electrode of the prismatic battery. A second through hole may be further provided on the bottom plate 112 of the battery case 1, and the prismatic battery may further include a negative electrode post 5, where the negative electrode post 5 penetrates through the second through hole, and the negative electrode post 5 may be connected with the first negative electrode tab 213 of the electric core 21, which is not connected with the adapter 3, to form a negative electrode of the prismatic battery.

Note that, depending on the number of the cells 21, the positive electrode tab 4 and the negative electrode tab 5 may be provided on the same side of the battery case 1, and for example, as shown in fig. 7, when the number of the cells 21 is two, the positive electrode tab 4 and the negative electrode tab 5 may be provided on the same side of the battery case 1. In general, when the number of the battery cells 21 is an odd number, the positive electrode post 4 and the negative electrode post 5 are provided on opposite sides of the battery case 1, and when the number of the battery cells 21 is an even number, the positive electrode post 4 and the negative electrode post 5 are provided on the same side of the battery case 1.

Referring to fig. 8, the first positive tab 212 and the first negative tab 213 may be disposed at the same end of the body portion 211. The first positive tab 212 is connected to the positive plate and is disposed on a side of the first end surface facing away from the body 211, and may be a portion of the positive plate extending to protrude from the body 211 and bent to a side of the first end surface facing away from the body 211 to form the first positive tab 212. The first negative electrode tab 213 is connected to the negative electrode sheet and is disposed on a side of the first end surface facing away from the body portion 211, and may be a portion of the negative electrode sheet extending and protruding from the body portion 211, and bent to a side of the first end surface facing away from the body portion 211 to form the first negative electrode tab 213.

In this case, since the first negative electrode tab 213 and the first positive electrode tab 212 are both provided on the first end face of the battery cell 21, the first positive electrode tab 212 covers a part of the first end face, and the first negative electrode tab 213 covers another part of the first end face; the first negative electrode tab 213 and the first positive electrode tab 212 are insulated from each other, and the insulation between the first negative electrode tab 213 and the first positive electrode tab 212 may be achieved by providing an insulating member between the first negative electrode tab 213 and the first positive electrode tab 212, or the insulation between the first negative electrode tab 213 and the first positive electrode tab 212 may be achieved by providing the first negative electrode tab 213 and the first positive electrode tab 212 at a distance from each other.

The adaptor 3 connects the first negative electrode tab 213 of one cell 21 with the first positive electrode tab 212 of the other cell 21 to realize the series connection of the cells 21. The adapter 3 may be provided in the form of a strip.

A first through hole and a second through hole may be provided on the top plate 111 of the battery case 1, and the prismatic battery may further include a positive electrode post 4 and a negative electrode post 5. The positive electrode post 4 penetrates through the first through hole, and the positive electrode post 4 can be connected with the first positive electrode lug 212 of the electric core 21 which is not connected with the adapter 3 to form the positive electrode of the prismatic battery. The negative electrode post 5 penetrates through the second through hole, and the negative electrode post 5 can be connected with the first negative electrode lug 213 of the electric core 21 which is not connected with the adapter 3 to form a negative electrode of the prismatic battery.

Further, referring to fig. 9, the cell groups 2 may be arranged in at least two groups, and at least two groups of cell groups 2 are stacked along the axial direction of the cell 21, so that the space utilization of the prismatic battery can be further improved.

The structure of at least two groups of electric core groups 2 can be the same, electric cores 21 in the electric core groups 2 can be connected in parallel, and then the electric core groups 2 are connected in series; the cells 21 in the cell groups 2 may be connected in series, and then the cell groups 2 may be connected in series or in parallel.

It is also possible that the cells 21 in the cell group 2 are not connected, but the cells 21 located on the same central axis are connected in series to form a series cell assembly, and then the series cell assemblies are connected in parallel.

Based on the same inventive concept, the exemplary embodiments of the present disclosure provide a battery pack, which may include a battery case and a first prismatic battery 100, as shown with reference to fig. 10; the first prismatic battery 100 is the prismatic battery according to any of the above, and the first prismatic battery 100 is provided in at least two.

The first prismatic battery 100 may be a triangular prismatic battery, and the battery cell group 2 of the first prismatic battery 100 may include three battery cells 21. The specific structure of the first prismatic battery 100 has been described in detail above, and thus, will not be described again here.

In this case, the battery pack formed by the two first prismatic batteries 100 may be formed in a parallelogram, the battery pack formed by the three first prismatic batteries 100 may be formed in a trapezoid, and the battery pack formed by the four first prismatic batteries 100 may be formed in a trapezoid, but a relatively flat structure is not formed at the end of the battery pack.

In order to solve the above technical problems, the battery pack may further include a second prismatic battery 200, where the second prismatic battery 200 is any one of the prismatic batteries described above, and the second prismatic battery 200 is a right-angle triangular prismatic battery, and the specific structure of the second prismatic battery 200 is described in detail above, so that details are not repeated here.

The second prismatic battery 200 is disposed on at least one side of the arrangement direction of the at least two first prismatic batteries 100, so that at least one side of the battery pack forms a relatively flat structure, and if the second prismatic battery 200 is disposed on both sides of the arrangement direction of the first prismatic batteries 100, the second prismatic battery 200 and the first prismatic batteries 100 are spliced to form a cuboid. The battery pack is convenient to install and use.

Additionally, in other example embodiments of the present disclosure, the first prismatic battery 100 may be a quadrangular battery, and the cell group 2 of the first prismatic battery 100 may include four cells 21. The specific structure thereof has been described in detail above, and thus, will not be described in detail herein.

Of course, the first prismatic battery 100 may also be a pentagonal prismatic battery, a hexagonal prismatic battery, or the like.

The references to "parallel", "perpendicular" in this application are not entirely parallel, perpendicular, but rather are to some degree of error; for example, the included angle between the two is greater than or equal to 0 ° and less than or equal to 5 °, i.e. the two are considered to be parallel to each other; the included angle between the two is more than or equal to 85 degrees and less than or equal to 95 degrees, namely the two are considered to be mutually perpendicular.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (11)

1. A prismatic battery, comprising:

a battery case provided as a prism;

the battery cell group is arranged in the battery shell and comprises at least two battery cells, the battery cells are arranged into cylinders, and two adjacent battery cells in the battery cell group are arranged side by side.

2. The prismatic battery according to claim 1, wherein the ratio of the total volume of at least two of said cells to the volume of said battery housing is 80% or more.

3. The prismatic battery according to claim 1, wherein the ratio of the total area of the end faces of at least two of the cells of the cell group to the area of the end face of the battery case is 60% or more and 99% or less.

4. The prismatic battery according to claim 1, wherein said battery case has two end plates arranged opposite to each other, said battery cell has two end faces arranged opposite to each other, said end faces are parallel to said end plates, an orthographic projection of a center point of said end plates on a first reference plane is located on a line segment formed by a line connecting orthographic projections of center points of said end faces of at least two said battery cells on the first reference plane, or an orthographic projection of a center point of said end plates on the first reference plane coincides with a center point of a pattern enclosed by orthographic projections of center points of said end faces of at least two said battery cells on the first reference plane, said first reference plane being parallel to said end faces.

5. The prismatic battery according to claim 1, wherein at least two of said cells are connected in parallel or in series.

6. The prismatic battery according to claim 1, further comprising:

and the switching piece is connected with at least two electric cores so as to realize parallel connection or serial connection of the at least two electric cores, and the switching piece is arranged into an integrated structure.

7. The prismatic battery according to claim 1, wherein said cell groups are arranged in at least two groups, at least two of said cell groups being arranged in a stack along an axial direction of said cells.

8. A battery pack, comprising:

a battery box;

a first prismatic battery, being a prismatic battery according to any of the claims 1 to 7, said first prismatic battery being provided in at least two.

9. The battery of claim 8, wherein the first prismatic cell is a triangular prismatic cell and the cell stack of the first prismatic cell comprises three cells.

10. The battery pack of claim 9, wherein the battery pack comprises:

the second prismatic battery according to any one of claims 1 to 7, which is a rectangular triangular prismatic battery, and is provided on at least one side of the arrangement direction of at least two of the first prismatic batteries.

11. The battery of claim 8, wherein the first prismatic cell is a quadrangular cell and the cell stack of the first prismatic cell comprises four cells.